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Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Next Generation Attics and Roof Systems  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Next Generation Attics Next Generation Attics and Roof Systems William (Bill) Miller, Ph.D. ORNL WML@ORNL.GOV____ (865) 574-2013 April 4, 2013 Goals: Develop New Roof and Attic Designs  Reduce Space Conditioning Due to Attic  Convince Industry to Adopt Designs Building Envelope Program  Dr. William Miller  Dr. Som Shrestha  Kaushik Biswas, Ken Childs, Jerald Atchley, Phil Childs Andre Desjarlais (Group Leader) 32% Primary Energy 28% Primary Energy 2 | Building Technologies Office eere.energy.gov Purpose & Objectives

2

Next Generation Roofs and Attics for Homes  

SciTech Connect

Prototype residential roof and attic assemblies were constructed and field tested in a mixed-humid U.S. climate. Summer field data showed that at peak day irradiance the heat transfer penetrating the roof deck dropped almost 90% compared with heat transfer for a conventional roof and attic assembly. The prototype assemblies use a combination of strategies: infrared reflective cool roofs, radiant barriers, above-sheathing ventilation, low-emittance surfaces, insulation, and thermal mass to reduce the attic air temperature and thus the heat transfer into the home. The prototype assemblies exhibited attic air temperatures that did not exceed the peak day outdoor air temperature. Field results were benchmarked against an attic computer tool and simulations made for the densely populated, hot and dry southeastern and central-basin regions of California. New construction in the central basin could realize a 12% drop in ceiling and air-conditioning annual load compared with a code-compliant roof and attic having solar reflectance of 0.25 and thermal emittance of 0.75. In the hot, dry southeastern region of California, the combined ceiling and duct annual load drops by 23% of that computed for a code-compliant roof and attic assembly. Eliminating air leakage from ducts placed in unconditioned attics yielded savings comparable to the best simulated roof and attic systems. Retrofitting an infrared reflective clay tile roof with 1 -in (0.032-m) of EPS foam above the sheathing and improving existing ductwork by reducing air leakage and wrapping ducts with insulation can yield annual savings of about $200 compared with energy costs for pre-1980 construction.

Miller, William A [ORNL; Kosny, Jan [ORNL

2008-01-01T23:59:59.000Z

3

Attic or Roof? An Evaluation of Two Advanced Weatherization Packages  

SciTech Connect

This project examines implementation of advanced retrofit measures in the context of a large-scale weatherization program and the archetypal Chicago brick bungalow. One strategy applies best practice air sealing methods and a standard insulation method to the attic floor. The other strategy creates an unvented roof assembly using materials and methods typically available to weatherization contractors. Through implementations of the retrofit strategies in a total of eight (8) test homes, the research found that the two different strategies achieve similar reductions in air leakage measurement (55%) and predicted energy performance (18%) relative to the pre-retrofit conditions.

Neuhauser, K.

2012-06-01T23:59:59.000Z

4

Roof and Attic Design Guidelines for new and retrofit Construction of Homes in Hot and Coild Climates  

SciTech Connect

Some guidelines for improving the energy efficiency of roofs and attics are presented and are based on the research of the DOE Building Technology. The results of combined analytical and experimental studies were used to benchmark computer tools, which in turn, were used to simulate homes in hot and cold climates. Adding floor and roof insulation, above deck ventilation, radiant barriers, cool color shingle, metal or tile roofs, sealing the attic floor, sealing the duct system and sealing the attic were simulated to compute the cost of energy savings. Results are prioritized to help building owners make an informed economic decision when contemplating roof and attic retrofits. Sealing the attic floor is a top retrofit option. The sealed attic approach and a new prototype roof assembly an insulated and ventilated roof are good options for retrofit work but have paybacks ranging from 15 to 25 years. A new sealed attic concept was simulated and computations show its simple payback is about 10 to 12 years in hot and cold climates; its first cost is significantly reduced from that of a spray foam approach. For new construction the best option is to keep the ducts out of the attic, make sure the attic floor is sealed and add at least code level of insulation to the ceiling.

Desjarlais, Andre Omer [ORNL] [ORNL; LaFrance, Marc [International Energy Agency] [International Energy Agency

2013-01-01T23:59:59.000Z

5

The Equivalent Thermal Resistance of Tile Roofs with and without Batten Systems  

Science Conference Proceedings (OSTI)

Clay and concrete tile roofs were installed on a fully instrumented attic test facility operating in East Tennessee s climate. Roof, attic and deck temperatures and heat flows were recorded for each of the tile roofs and also on an adjacent attic cavity covered with a conventionally pigmented and direct-nailed asphalt shingle roof. The data were used to benchmark a computer tool for simulation of roofs and attics and the tool used to develop an approach for computing an equivalent seasonal R-value for sub-tile venting. The approach computed equal heat fluxes through the ceilings of roofs having different combinations of surface radiation properties and or building constructions. A direct nailed shingle roof served as a control for estimating the equivalent thermal resistance of the air space. Simulations were benchmarked to data in the ASHRAE Fundamentals for the thermal resistance of inclined and closed air spaces.

Miller, William A [ORNL] [ORNL

2013-01-01T23:59:59.000Z

6

Simulated Attic Radiant Barrier Performance  

Science Conference Proceedings (OSTI)

A recent EPRI evaluation determined that attic radiant barriers installed under roof decks are increasingly effective in reducing cooling energy use as insolation increases and ceiling insulation thickness decreases. A savings worksheet included in this report allows rapid estimation of these energy cost impacts.

1991-03-29T23:59:59.000Z

7

Conditioned Attics Overview | Building Energy Codes Program  

NLE Websites -- All DOE Office Websites (Extended Search)

Conditioned Attics Overview Conditioned Attics Overview Adequate attic ventilation is a long-standing requirement in building codes. However, conditioned, unvented attics have the potential to reduce residential energy needs and are allowed by code under certain conditions. Such assemblies are sometimes called cathedralized attics because, as with cathedral ceilings, the insulation is in the rafters and/or roof deck. Publication Date: Wednesday, May 13, 2009 ta_conditioned_attics_overview.pdf Document Details Affiliation: DOE BECP Document Number: PNNL-SA-57260 Focus: Compliance Building Type: Residential Code Referenced: International Energy Conservation Code (IECC) Document type: Technical Articles Target Audience: Architect/Designer Builder Code Official Contractor Engineer Contacts Web Site Policies

8

Effect of radiant barriers and attic ventilation on residential attics and attic duct systems: New tools for measuring and modeling  

Science Conference Proceedings (OSTI)

A simple duct system was installed in an attic test module for a large scale climate simulator at a US national laboratory. The goal of the tests and subsequent modeling was to develop an accurate method of assessing duct system performance in the laboratory, enabling limiting conditions to be imposed at will and results to be applied to residential attics with attic duct systems. Steady-state tests were done at a severe summer and a mild winter condition. In all tests the roof surface was heated above ambient air temperatures by infrared lights. The attic test module first included then did not include the duct system. Attic ventilation from eave vents to a ridge vent was varied from none to values achievable by a high level of power ventilation. A radiant barrier was attached to the underside of the roof deck, both with and without the duct system in place. Tests were also done without the radiant barrier, both with and without the duct system. When installed, the insulated ducts ran along the floor of the attic, just above the attic insulation and along the edge of the attic near the eaves and one gable. These tests in a climate simulator achieved careful control and reproducibility of conditions. This elucidated dependencies that would otherwise be hidden by variations in uncontrolled variables. Based on the comparisons with the results of the tests at the mild winter condition and the severe summer condition, model predictions for attic air and insulation temperatures should be accurate within {+-} 10 F ({+-} 6 C). This is judged adequate for design purposes and could be better when exploring the effect of changes in attic and duct parameters at fixed climatic conditions.

Petrie, T.W.; Childs, P.W.; Christian, J.E.; Wilkes, K.E.

1998-07-01T23:59:59.000Z

9

Cool roofs as an energy conservation measure for federal buildings  

E-Print Network (OSTI)

of asphalt shingle, plywood, with an attic cavity andbuilt-up roofs with inch plywood, attic space, and an R-11a combination of stucco, plywood, insulation and gypsum, or

Taha, Haider; Akbari, Hashem

2003-01-01T23:59:59.000Z

10

Building Energy Software Tools Directory: Construction R-value Calculator  

NLE Websites -- All DOE Office Websites (Extended Search)

Construction R-value Calculator Construction R-value Calculator This online calculator calculates the R-value of a large number of common wall and roof constructions given a specified level of insulation. It uses the isothermal planes method to account for thermal bridging of framing material. Keywords R-value, thermal bridging Validation/Testing N/A Expertise Required Basic understanding of construction details is required. Users Approximately 15,000 web hits per month, mainly from New Zealand. Audience Designers and architects, researchers, officials dealing with building regulations Input The user selects the appropriate wall and roof design details from a number of drop-down boxes and enters the R-value of the installed insulation product. Output The program displays the R-value achieved by the wall or roof construction

11

Moisture performance of sealed attics in the mixed-humid climate  

SciTech Connect

Oak Ridge National Laboratory studied 8 homes in the mixed-humid climate, 4 with vented attics and 4 with sealed attics. ORNL wanted to understand the moisture performance of the sealed attic and how it affected the interior environment. We found that the attic and interior of sealed attic homes were more humid than the attic and interior observed in vented attic homes. This is due to the lack of ventilation in the sealed attic. Historically attics have been vented to dehumidify the attic and interior of the home. A sealed attic design greatly reduces the venting potential and thus this drying pathway and can cause elevated interior moisture over a vented attic home. Despite the elevated attic and interior moisture in the sealed attic homes, so far no mold or material degradation has been found. The roof sheathing moisture content has stayed below 20%, indicating low potential for material degradation. Also the relative humidity at the roof sheathing has stayed within the ASHRAE 160 design criteria except for a short time during the 2011/2012 winter. This was due to a combination of the sealed attic design (minimal venting to the outside) and the duct work not being operated in the attic which usually provides a dehumidification pathway. It was also found that when the humidity was controlled using the HVAC system, it resulted in 7% more cooling energy consumption. In the mixed-humid climate this reduces the cost effectiveness of the sealed attic design as a solution for bringing ducts into a semi-conditioned space. Because of this we are recommending the other alternatives be used to bringing ducts into the conditioned space in both new construction and retrofit work in the mixed-humid climate.

Boudreaux, Philip R [ORNL] [ORNL; Pallin, Simon B [ORNL] [ORNL; Jackson, Roderick K [ORNL] [ORNL

2013-12-01T23:59:59.000Z

12

Metal roofing Shingle roofing  

E-Print Network (OSTI)

of electricity for air-conditioning. One of the causes for the high usage of air-conditioning is a hot attic because the thermal energy is retained due to poor ventilation. Objective Reduce the high usage of air to the attic and lower the temperature of the attic space. 2. Lower attic temperatures will correlate to lower

Hutcheon, James M.

13

R-value Calculator  

NLE Websites -- All DOE Office Websites (Extended Search)

Advanced Wall Systems Advanced Wall Systems ORNL Home ASTM Testing BEP Home Related Sites Work With Us Advanced Wall Systems Home Interactive Calculators New Whole Wall R-value Calculators As A Part Of The ORNL Material Database For Whole Building Energy Simulations These calculators are replacing the old Whole Wall Thermal Performance calculator. These new versions of the calculator contain many new features and are part of the newly developed Interactive Envelope Materials Database for Whole-Building Energy Simulation Programs. The simple version of the Whole Wall R-value calculator is now available for use. This calculator is similar to the previous Whole Wall Thermal Performance calculator and does not require any downloads from the user. However, it was updated to allow calculations for fourteen wall details

14

Modeling attic humidity as a function of weather, building construction, and ventilation rates  

Science Conference Proceedings (OSTI)

A dynamic model for predicting attic relative humidity (RH) and roof-sheathing moisture content (MC) was developed for microcomputer application. The model accepts standard hourly weather data and building-design parameters as input. Model predictions gave good agreement with measured data from a house located in Madison, Wisconsin. Solar radiation varies with roof orientation and plays an important role in determining moisture transfer to and from the roof sheathing. Opposing roof surfaces must be differentiated in attic humidity models to account for the effect of solar radiation. The model described in this paper is capable of such differentiation. Snow accumulation on a roof can significantly alter the temperature and moisture conditions in an attic, but further research is needed to understand the effect of a snow layer on attic temperatures. Various scenarios were simulated with this model to determine the effect of building practice and ventilation strategies on roof sheathing MC. Direct control of RH in the living space by ventilation is very effective in lowering attic moisture conditions. Where natural ventilation is not adequate, a timer-controlled attic fan shows great promise for ensuring efficient and economical attic ventilation.

Gorman, T.M.

1987-01-01T23:59:59.000Z

15

Next Generation Attics and Roof Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Milestone Status 1 Test Plan approved by KB Home and Owens Corning Complete 2 Cold climate demonstration switched to hot climate. Instrument and commission data...

16

Thermal Performance of Unvented Attics in Hot-Dry Climates: Results from Building America; Preprint  

DOE Green Energy (OSTI)

Unvented attics have become a more common design feature implemented by Building America partners in hot-dry climates of the United States. More attention is being focused on how this approach affects heating and cooling energy consumption. By eliminating the ridge and eave vents that circulate outside air through the attic and by moving the insulation from the attic floor to the underside of the roof, an unvented attic become a semi-conditioned space, creating a more benign environment for space conditioning ducts.

Hendron, R.; Farrar-Nagy, S.; Anderson, R.; Reeves, P.; Hancock, E.

2003-01-01T23:59:59.000Z

17

Building Energy Software Tools Directory: Cool Roof Calculator  

NLE Websites -- All DOE Office Websites (Extended Search)

classes of users: potential customersbuilding owners and roofing surface sellersinstallers. Input User selects location, enters the proposed roof's R-value, reflectance,...

18

Cooling Energy Measurements of Houses with Attics Containing Radiant Barriers  

E-Print Network (OSTI)

Tests were conducted by Oak Ridge National Laboratory (ORNL) to determine the magnitude of the energy savings brought about by installing radiant barriers in the attics of single-family houses. The radiant barrier used for this test was a product with two reflective aluminum surfaces on a kraft paper base. The radiant barrier has the potential to reduce the radiant heat transfer component impinging on the fiberglass attic insulation. Working as a system in conjunction with an air space, the radiant barrier could theoretically block up to 95% of far-infrared radiation heat transfer. The experiment was conducted in three unoccupied research houses that are operated by ORNL. One house was used as the control house (no barrier was installed), while the other two were used to test the two different methods for installing the radiant barriers. In one house, the barrier was laid on top of the attic fiberglass batt insulation, and in the other house, the barrier was attached to the underside of the roof trusses. The attics of all three houses were insulated with kraft paper faced nominal R-19 fiberglass batt insulation. The results showed a savings in the cooling loads of 21% when the radiant barrier was laid on top of the attic fiberglass insulation and 13% with the radiant barrier attached to the underside of the roof trusses. The savings in electrical consumption was 17% and 9%, respectively. The electrical consumption data and the cooling load data indicated that the most effective way of installing the foil was to lay it on top of the fiberglass batt insulation. The radiant barriers reduced the measured peak ceiling heat fluxes by 39% for the case where the barrier was laid on top of the attic fiberglass insulation. The radiant barrier reduced the integrated heat flows from the attic to house by approximately 30-35% over a 7-day time period.

Levins, W. P.; Karnitz, M. A.; Knight, D. K.

1986-01-01T23:59:59.000Z

19

Cooling energy measurements of houses with attics containing radiant barriers  

Science Conference Proceedings (OSTI)

Tests were conducted by Oak Ridge National Laboratory (ORNL) to determine the magnitude of the energy savings brought about by installing radiant barriers in the attics of single-family houses. The radiant barrier used for this test was a product with two reflective aluminum surfaces on a kraft paper base. The radiant barrier has the potential to reduce the radiant heat transfer component impinging on the fiberglass attic insulation. Working as a system in conjunction with an air space, the radiant barrier could theoretically block up to 95% of far-infrared radiation heat transfer. The results showed a savings in the cooling loads of 21% when the radiant barrier was laid on top of the attic fiberglass insulation and 13% with the radiant barrier attached to the underside of the roof trusses. The savings in electrical consumption was 17% and 9%, respectively.

Levins, W.P.; Karnitz, M.A.; Knight, D.K.

1986-01-01T23:59:59.000Z

20

A Hygrothermal Risk Analysis Applied to Residential Unvented Attics  

SciTech Connect

Aresidential building, constructed with an unvented attic, is acommonroof assembly in the United States.The expected hygrothermal performance and service life of the roof are difficult to estimate due to a number of varying parameters.Typical parameters expected to vary are the climate, direction, and slope of the roof as well as the radiation properties of the surface material. Furthermore, influential parameters are indoor moisture excess, air leakages through the attic floor, and leakages from air-handling unit and ventilation ducts. In addition, the type of building materials such as the insulation material and closed or open cell spray polyurethane foam will influence the future performance of the roof. A development of a simulation model of the roof assembly will enable a risk and sensitivity analysis, in which the most important varying parameters on the hygrothermal performance can be determined. The model is designed to perform probabilistic simulations using mathematical and hygrothermal calculation tools. The varying input parameters can be chosen from existing measurements, simulations, or standards. An analysis is applied to determine the risk of consequences, such as mold growth, rot, or energy demand of the HVAC unit. Furthermore, the future performance of the roof can be simulated in different climates to facilitate the design of an efficient and reliable roof construction with the most suitable technical solution and to determine the most appropriate building materials for a given climate

Pallin, Simon B [ORNL] [ORNL; Kehrer, Manfred [ORNL] [ORNL

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Thermal Performance Evaluation of Attic Radiant Barrier Systems Using the Large Scale Climate Simulator (LSCS)  

SciTech Connect

Application of radiant barriers and low-emittance surface coatings in residential building attics can significantly reduce conditioning loads from heat flow through attic floors. The roofing industry has been developing and using various radiant barrier systems and low-emittance surface coatings to increase energy efficiency in buildings; however, minimal data are available that quantifies the effectiveness of these technologies. This study evaluates performance of various attic radiant barrier systems under simulated summer daytime conditions and nighttime or low solar gain daytime winter conditions using the large scale climate simulator (LSCS). The four attic configurations that were evaluated are 1) no radiant barrier (control), 2) perforated low-e foil laminated oriented strand board (OSB) deck, 3) low-e foil stapled on rafters, and 4) liquid applied low-emittance coating on roof deck and rafters. All test attics used nominal RUS 13 h-ft2- F/Btu (RSI 2.29 m2-K/W) fiberglass batt insulation on attic floor. Results indicate that the three systems with radiant barriers had heat flows through the attic floor during summer daytime condition that were 33%, 50%, and 19% lower than the control, respectively.

Shrestha, Som S [ORNL] [ORNL; Miller, William A [ORNL] [ORNL; Desjarlais, Andre Omer [ORNL] [ORNL

2013-01-01T23:59:59.000Z

22

Influence of Infrared Radiation on Attic Heat Transfer  

E-Print Network (OSTI)

An experimental study concerned with different modes of heal transfer in fibrous and cellulose insulating material is presented. A series of experiments were conducted using an attic simulator to determine the effects of ventilation on attic heat transfer, and the effect of infrared radiation on the thermal conductivity of the insulation system and on attic heat transfer. All the tests were performed at steady state conditions by controlling the roof deck temperature. Calculations are performed for insulation thicknesses between 1 inch (2.54cm) and 6.0 inches (15.24cm) and roof deck temperatures between 145F (62.78C) and 100F (36.78C). The temperature profiles within the insulation were measured by placing thermocouples at various levels within the insulation. The profiles for the cellulose insulation are linear. The profiles within the glass fiber insulation are non-linear due to the effect of infrared radiation. Also heat fluxes were measured through different insulation thicknesses and for different roof temperatures. It was found that a radiant barrier such as aluminum foil can reduce the heat flux significantly. Experimental results were compared to a Three-Region approximate solution developed at Oak Ridge National Laboratories (ORNL). The model was in good agreement with experimental results.

Katipamula, S.; Turner, W. D.; Murphy, W. E.; O'Neal, D. L.

1985-01-01T23:59:59.000Z

23

Influence of Attic Radiant Barrier Systems on Air Conditioning Demand in an Utility Pilot Project  

E-Print Network (OSTI)

A utility monitoring project has evaluated radiant barrier systems (RBS) as a new potential demand site management (DSM) program. The study examined how the retrofit of attic radiant barriers can be expected to alter utility residential space conditioning loads. An RBS consists of a layer of aluminum foil fastened to roof decking or roof trusses to block radiant heat transfer between the hot roof surface and the attic below. The radiant barrier can significantly lower summer heat transfer to the attic insulation and to the cooling duct system. Both of these mechanisms have strong potential impacts on cooling energy use as illustrated in Figures 1 and 2. The pilot project involved installation of RBS in nine homes that had been extensively monitored over the preceding year. The houses varied in conditioned floor area from 939 to 2,440 square feet; attic insulation varied from R-9 to R-30. The homes had shingle roofs with varying degrees of attic ventilation. The radiant barriers were installed during the summer of 2000. Data analysis on the pre and post cooling and heating consumption was used to determine impacts on energy use and peak demand for the utility. The average cooling energy savings from the RBS retrofit was 3.6 kWh/day, or about 9%. The average reduction in summer afternoon peak demand was 420 watts (or about 16%).

Parker, D. S.; Sherwin, J. R.

2002-01-01T23:59:59.000Z

24

Evolution of cool-roof standards in the United States  

E-Print Network (OSTI)

solar absorptance, attic, and duct insulation on cooling and heating energy use in single-family new residential buildings.solar- reflective roof on the heating- and cooling-energy uses of a residential-building

Akbari, Hashem

2008-01-01T23:59:59.000Z

25

Performance Assessment of Photovoltaic Attic Ventilator Fans  

E-Print Network (OSTI)

Controlling summer attic heat gain is important to reducing air conditioning energy use in homes in hot-humid climates. Both heat transfer through ceilings and t attic duct systems can make up a large part of peak cooling demand, Attic ventilation has long been identified as a method to abate such heat gains. We present test results from using the photovoltaic (PV) attic ventilator fans in a test home to assess impact on attic and cooling energy performance.

Parker, D. S.; Sherwin, J. R.

2000-01-01T23:59:59.000Z

26

Energy measurements of attic radiant barriers installed in single-family houses  

Science Conference Proceedings (OSTI)

Testing was conducted by the Oak Ridge National Laboratory to determine the energy savings attributable to radiant barriers installed in attics of unoccupied single-family houses. Three levels of fiberglass attic insulation (R-11 ,R-19, and R-30) were tested with two types of barrier installation (horizontal and truss). The results showed that horizontally installed radiant barriers were more effective than truss barriers in reducing heating and cooling loads. Measured cooling load reductions ranged form 0 to 22% (compared to same attic insulation insulation R-value with no radiant barrier) and heating load changes from /plus/4% to /minus/10% were measured (compared to same attic insulation R-value with no radiant barrier). Radiant barriers appeared to decrease the heating and cooling loads more when lesser amounts of insulation (R-11 and R-19) were present in an attic. Minimal changes were measured when R-30 was present in an attic. Long-term effects of dust on the performance of radiant barriers as well as the effects of moisture condensing on the surface of a radiant barrier during cold winter temperatures remain unanswered.

Levins, W.P.; Karnitz, M.A.

1988-07-01T23:59:59.000Z

27

Inverted Attic Bulkhead for HVAC Ductwork | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Inverted Attic Bulkhead for HVAC Ductwork Inverted Attic Bulkhead for HVAC Ductwork Inverted Attic Bulkhead for HVAC Ductwork, Roseville, California (Fact Sheet), Building America...

28

Internal Microclimate Resulting From Ventilated Attics in Hot and Humid Regions  

E-Print Network (OSTI)

Ventilated spaces in the built environment create unique and beneficial microclimates. While the current trends in building physics suggest sealing attics and crawlspaces, comprehensive research still supports the benefits of the ventilated microclimate. Data collected at the University of Florida Energy Park show the attic environment of asphalt shingled roofs to be typically hotter than the outdoor conditions, but when properly ventilated sustains a much lower relative humidity. The hot, humid regions of the United States can utilize this internally convective, exchanging air mass to provide stable moisture levels within attic spaces. Positioning the buildings primary boundary at the ceiling deck allows for utilization of this buffer climate to minimize moisture trapping in insulation and maximize the insulations thermal benefits. This investigation concludes the conditions in a ventilated attic are stable through seasonal changes and promotes cost effective, energy efficient climate control of unconditioned spaces in hot, humid regions.

Mooney, B. L.; Porter, W. A.

2010-08-01T23:59:59.000Z

29

Advanced Energy Efficient Roof System  

SciTech Connect

Energy consumption in buildings represents 40 percent of primary U.S. energy consumption, split almost equally between residential (22%) and commercial (18%) buildings.1 Space heating (31%) and cooling (12%) account for approximately 9 quadrillion Btu. Improvements in the building envelope can have a significant impact on reducing energy consumption. Thermal losses (or gains) from the roof make up 14 percent of the building component energy load. Infiltration through the building envelope, including the roof, accounts for an additional 28 percent of the heating loads and 16 percent of the cooling loads. These figures provide a strong incentive to develop and implement more energy efficient roof systems. The roof is perhaps the most challenging component of the building envelope to change for many reasons. The engineered roof truss, which has been around since 1956, is relatively low cost and is the industry standard. The roof has multiple functions. A typical wood frame home lasts a long time. Building codes vary across the country. Customer and trade acceptance of new building products and materials may impede market penetration. The energy savings of a new roof system must be balanced with other requirements such as first and life-cycle costs, durability, appearance, and ease of construction. Conventional residential roof construction utilizes closely spaced roof trusses supporting a layer of sheathing and roofing materials. Gypsum board is typically attached to the lower chord of the trusses forming the finished ceiling for the occupied space. Often in warmer climates, the HVAC system and ducts are placed in the unconditioned and otherwise unusable attic. High temperature differentials and leaky ducts result in thermal losses. Penetrations through the ceilings are notoriously difficult to seal and lead to moisture and air infiltration. These issues all contribute to greater energy use and have led builders to consider construction of a conditioned attic. The options considered to date are not ideal. One approach is to insulate between the trusses at the roof plane. The construction process is time consuming and costs more than conventional attic construction. Moreover, the problems of air infiltration and thermal bridges across the insulation remain. Another approach is to use structurally insulated panels (SIPs), but conventional SIPs are unlikely to be the ultimate solution because an additional underlying support structure is required except for short spans. In addition, wood spline and metal locking joints can result in thermal bridges and gaps in the foam. This study undertook a more innovative approach to roof construction. The goal was to design and evaluate a modular energy efficient panelized roof system with the following attributes: (1) a conditioned and clear attic space for HVAC equipment and additional finished area in the attic; (2) manufactured panels that provide structure, insulation, and accommodate a variety of roofing materials; (3) panels that require support only at the ends; (4) optimal energy performance by minimizing thermal bridging and air infiltration; (5) minimal risk of moisture problems; (6) minimum 50-year life; (7) applicable to a range of house styles, climates and conditions; (8) easy erection in the field; (9) the option to incorporate factory-installed solar systems into the panel; and (10) lowest possible cost. A nationwide market study shows there is a defined market opportunity for such a panelized roof system with production and semi-custom builders in the United States. Senior personnel at top builders expressed interest in the performance attributes and indicate long-term opportunity exists if the system can deliver a clear value proposition. Specifically, builders are interested in (1) reducing construction cycle time (cost) and (2) offering increased energy efficiency to the homebuyer. Additional living space under the roof panels is another low-cost asset identified as part of the study. The market potential is enhanced through construction activity levels in target marke

Jane Davidson

2008-09-30T23:59:59.000Z

30

An Evaluation of the Placement of the Placement of Radiant Barriers on their Effectiveness in Reducing Heat Transfer in Attics  

E-Print Network (OSTI)

Experimental tests were conducted to measure the influence of radiant barriers and the effect of the radiant barrier location on attic heat transfer. All the tests were conducted in an attic simulator at a steady state. The heat flux through the attic floor was measured at two different roof deck temperatures (120F and 140F). The temperature distribution within the base fibrous insulation was also measured. Three different solid kraft laminates with aluminum foil backing were tested. There was a 34 percent reduction (sample A) in heat flux through the ceiling for the case where the radiant barrier was placed 6 inches below the roof deck in addition to the base fibrous insulation (R-11), with the roof deck at 140 F. The reduction for the same sample with the radiant barrier placed on the studs of the attic floor was 46 percent. For all the three samples, the heat flux through the attic floor was reduced when the radiant barrier was placed on the attic floor studs.

Katipamula, S.; O'Neal, D.

1986-01-01T23:59:59.000Z

31

Status of cool roof standards in the United States  

E-Print Network (OSTI)

roofs (Table 5.5 of ASHRAE 90.2- Climate Zone Roof U-FactorASHRAE 2004a) tabulates thermal transmittance multipliers by U.S. climate zones (ASHRAE 2007). ceilings with attics wood frame steel frame climate conventional cool conventional cool zone

Akbari, Hashem; Levinson, Ronnen

2008-01-01T23:59:59.000Z

32

A Prototype Roof Deck Designed to Self-Regulate Deck Temperature and Reduce Heat Transfer  

SciTech Connect

A prototype roof and attic assembly exploits the use of radiation, convection and insulation controls to reduce the heat transfer penetrating its roof deck by almost 85% of the heat transfer crossing a conventional roof and attic assembly. The assembly exhibited attic air temperatures that did not exceed the peak day outdoor ambient temperature. The design includes a passive ventilation scheme that pulls air from the soffit and attic into an inclined air space above the deck. The design complies with fire protection codes because the air intake is internal and closed to the elements. Field data were benchmarked against an attic computer tool and simulations made for new and retrofit home constructions in hot, moderate and cold climates to access economics for the assembly.

Miller, William A [ORNL

2011-01-01T23:59:59.000Z

33

A Prototype Roof Deck Designed to Self-Regulate Deck Temperature and Reduce Heat Transfer  

Science Conference Proceedings (OSTI)

A prototype roof and attic assembly exploits the use of radiation, convection and insulation controls to reduce its peak day heat transfer by almost 85 percent of the heat transfer crossing a conventional roof and attic assembly. The assembly exhibits attic air temperatures that do not exceed the maximum daily outdoor ambient temperature. The design includes a passive ventilation scheme that pulls air from the soffit and attic into an inclined air space above the roof deck. The design complies with fire protection codes because the air intake is internal and closed to the elements. Field data were benchmarked against an attic computer tool and simulations made for new and retrofit constructions in hot, moderate and cold climates to gauge the cost of energy savings and potential payback.

Miller, William A [ORNL

2011-01-01T23:59:59.000Z

34

Income Tax Deduction for Solar-Powered Roof Vents or Fans (Indiana...  

Open Energy Info (EERE)

1232012 References DSIRE1 Summary Indiana allows taxpayers to take a deduction on solar-powered roof fans (or vent, also sometimes called an attic fan) installed in a home...

35

Income Tax Deduction for Solar-Powered Roof Vents or Fans  

Energy.gov (U.S. Department of Energy (DOE))

Indiana allows taxpayers to take a deduction on solar-powered roof fans (or vent, also sometimes called an attic fan) installed in a home that the taxpayer owns or leases. The deduction is for 50%...

36

Modeling the effects of reflective roofing  

SciTech Connect

Roofing materials which are highly reflective to sunlight are currently being developed. Reflective roofing is an effective summertime energy saver in warm and sunny climates. It has been demonstrated to save up to 40% of the energy needed to cool a building during the summer months. Buildings without air conditioning can reduce their indoor temperatures and improve occupant comfort during the summer if highly reflective roofing materials are used. But there are questions about the tradeoff between summer energy savings and extra wintertime energy use due to reduced heat collection by the roof. These questions are being answered by simulating buildings in various climates using the DOE-2 program (version 2.1E). Unfortunately, DOE-2 does not accurately model radiative, convective and conductive processes in the roof-attic. Radiative heat transfer from the underside of a reflective roof is much smaller than that of a roof which absorbs heat from sunlight, and must be accounted for in the building energy model. Convection correlations for the attic and the roof surface must be fine tuned. An equation to model the insulation`s conductivity dependence on temperature must also be added. A function was written to incorporate the attic heat transfer processes into the DOE-2 building energy simulation. This function adds radiative, convective and conductive equations to the energy balance of the roof. Results of the enhanced DOE-2 model were compared to measured data collected from a school bungalow in a Sacramento Municipal Utility District monitoring project, with particular attention paid to the year-round energy effects.

Gartland, L.M.; Konopacki, S.J.; Akbari, H. [Lawrence Berkeley National Lab., CA (United States). Energy and Environment Div.

1996-08-01T23:59:59.000Z

37

Humidity in Attics -- Sources and Control Methods  

Science Conference Proceedings (OSTI)

Guidelines for the control of moisture in attics are in a state of flux. The 1981 ASHRAE Handbook of Fundamentals gives only ''Past Practice'', and notes that such practice might not be currently valid. Furthermore, in the past it was assumed that the attic was an inert structure on which moisture would either condense or pass through unaffected. Results are presented which show that the attic is in a constant state of flux, absorbing and releasing moisture. A mathematical model for predicting the moisture content of attic wood members is presented. The model is used to predict hour-by-hour attic air humidity ratio, and seasonal wood moisture content. Results are compared with measured data. The application of the model to the re-calculation of attic ventilation standards is discussed, both with respect to condensation and wood rot.

Cleary, Peter

1984-07-01T23:59:59.000Z

38

Cooling-energy measurements of unoccupied single-family houses with attics containing radiant barriers  

Science Conference Proceedings (OSTI)

Tests were conducted by Oak Ridge National Laboratory (ORNL) to determine the magnitude of the energy savings brought about by installing radiant barriers in the attics of single-family houses. The radiant barrier used for this test is a product with two reflective aluminum surfaces on a kraft paper base. The purpose of the radiant barrier is to reduce the radiant heat transfer component impinging on the fiberglass attic insulation. The radiant barrier works as a system in conjunction with an air space and can theoretically block up to 95% of far-infrared radiation heat transfer. The experiment was conducted in three unoccupied research houses that are operated by ORNL. Two variations on the installation of radiant barriers were studied. One house was used as the control house (no barrier was installed), while the other two were used to test the two different methods for installing the radiant barriers. In one house the barrier was laid on top of the attic fiberglass batt insulation, and in the other house, the barrier was attached to the underside of the roof trusses. The attics of all three houses were insulated with kraft-paper-faced R-19 fiberglass batt insulation. The results showed a savings in the cooling loads of 21% when the radiant barrier was laid on top of the attic fiberglass insulation and 13% with the radiant barrier attached to the underside of the roof trusses. The savings in electrical consumption were 17% and 9%, respectively. The electrical consumption data and the cooling load data indicate that the most effective way of installing the foil is to lay it on top of the fiberglass insulation. The radiant barriers reduced the measured peak ceiling heat fluxes by 39% for the case where the barrier was laid on top of the fiberglass insulation. The radiant barrier reduced the integrated heat flows from the attic to the house by approximately 30 to 35% over a 7-day time period.

Levins, W.P.; Karnitz, M.A.

1986-07-01T23:59:59.000Z

39

Sustainable Retrofit of Residential Roofs Using Metal Roofing Panels, Thin-Film Photovoltaic Laminates, and PCM Heat Sink Technology  

DOE Green Energy (OSTI)

During September-October 2009, research teams representing Metal Construction Association (the largest North American trade association representing metal building manufacturers, builders, and material suppliers), CertainTeed (one of the largest U.S. manufacturers of thermal insulation and building envelope materials), Unisolar (largest U.S. producer of amorphous silicone photo-voltaic (PV) laminates), Phase Change Energy (manufacturer of bio-based PCM), and Oak Ridge National Laboratory (ORNL) installed three experimental attics utilizing different roof retrofit strategies in the ORNL campus. The main goal of this project was experimental evaluation of a newly-developed sustainable re-roofing technology utilizing amorphous silicone PV laminates integrated with metal roof and PCM heat sink. The experimental attic with PV laminate was expected to work during the winter time as a passive solar collector with PCM storing solar heat, absorbed during the day, and increasing overall attic air temperature during the night.

Kosny, Jan [ORNL; Miller, William A [ORNL; Childs, Phillip W [ORNL; Biswas, Kaushik [ORNL

2011-01-01T23:59:59.000Z

40

Development of a Roof Savings Calculator  

SciTech Connect

A web-based Roof Savings Calculator (RSC) has been deployed for the Department of Energy as an industry-consensus tool to help building owners, manufacturers, distributors, contractors and researchers easily run complex roof and attic simulations. This tool employs the latest web technologies and usability design to provide an easy input interface to an annual simulation of hour-by-hour, whole-building performance using the world-class simulation tools DOE-2.1E and AtticSim. Building defaults were assigned and can provide annual energy and cost savings after the user selects nothing more than building location. In addition to cool reflective roofs, the RSC tool can simulate multiple roof types at arbitrary inclinations. There are options for above sheathing ventilation, radiant barriers and low-emittance surfaces. The tool also accommodates HVAC ducts either in the conditioned space or in the attic with custom air leakage rates. Multiple layers of thermal mass, ceiling insulation and other parameters can be compared side-by-side to generate energy/cost savings between two buildings. The RSC tool was benchmarked against field data for demonstration homes in Ft Irwin, CA.

New, Joshua Ryan [ORNL; Miller, William A [ORNL; Huang, Joe [Lawrence Berkeley National Laboratory (LBNL); Erdem, Ender [Lawrence Berkeley National Laboratory (LBNL)

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Development of a Roof Savings Calculator  

SciTech Connect

A web-based Roof Savings Calculator (RSC) has been deployed for the Department of Energy as an industry-consensus tool to help building owners, manufacturers, distributors, contractors and researchers easily run complex roof and attic simulations. This tool employs the latest web technologies and usability design to provide an easy input interface to an annual simulation of hour-by-hour, whole-building performance using the world-class simulation tools DOE-2.1E and AtticSim. Building defaults were assigned and can provide estimated annual energy and cost savings after the user selects nothing more than building location. In addition to cool reflective roofs, the RSC tool can simulate multiple roof types at arbitrary inclinations. There are options for above sheathing ventilation, radiant barriers, and low-emittance surfaces. The tool also accommodates HVAC ducts either in the conditioned space or in the attic with custom air leakage rates. Multiple layers of building materials, ceiling and deck insulation, and other parameters can be compared side-by-side to generate an energy/cost savings estimate between two buildings. The RSC tool was benchmarked against field data for demonstration homes in Ft. Irwin, CA.

New, Joshua Ryan [ORNL; Miller, William A [ORNL; Desjarlais, Andre Omer [ORNL; Erdem, Ender [Lawrence Berkeley National Laboratory (LBNL); Huang, Joe [Lawrence Berkeley National Laboratory (LBNL)

2011-01-01T23:59:59.000Z

42

The Effects of Infrared-Blocking Pigments and Deck Venting on Stone-Coated Metal Residential Roofs  

Science Conference Proceedings (OSTI)

Field data show that stone-coated metal shakes and S-mission tile, which exploit the use of infraredblocking color pigments (IrBCPs), along with underside venting reduce the heat flow penetrating the conditioned space of a residence by 70% compared with the amount of heat flow penetrating roofs with conventional asphalt shingles. Stone-coated metal roof products are typically placed on battens and counter-battens and nailed through the battens to the roof deck. The design provides venting on the underside of the metal roof that reduces the heat flow penetrating a home. The Metal Construction Association (MCA) and its affiliate members installed stone-coated metal roofs with shake and S-mission tile profiles and a painted metal shake roof on a fully instrumented attic test assembly at Oak Ridge National Laboratory (ORNL). Measurements of roof, deck, attic, and ceiling temperatures; heat flows; solar reflectance; thermal emittance; and ambient weather were recorded for each of the test roofs and also for an adjacent attic cavity covered with a conventional pigmented and direct nailed asphalt shingle roof. All attic assemblies had ridge and soffit venting; the ridge was open to the underside of the stone-coated metal roofs. A control assembly with a conventional asphalt shingle roof was used for comparing deck and ceiling heat transfer rates.

Miller, William A [ORNL

2006-01-01T23:59:59.000Z

43

Comparative Summer Thermal Performance of Finished and Unfinished Metal Roofing Products with Composition Shingles  

E-Print Network (OSTI)

This paper presents an overview of results from experimental research conducted at FSEC's Flexible Roofing Facility in the summer of 2002. The Flexible Roof Facility (FRF) is a test facility in Cocoa, Florida designed to evaluate a combination of five roofing systems against a control roof using dark shingles. The intent of the testing is to evaluate how roofing systems impact residential cooling energy use. Recent testing emphasizes evaluation of how increasingly popular metal roofing systems, both finished and unfinished, might compare with other more traditional roofing types. All of the test cells had R-19 insulation installed on the attic floor except in the double roof configuration which had R-19 of open cell foam blown onto the underside of the roof decking. The test results were used to determine relative thermal performance of various roofing systems under typical Florida summer conditions. Measured impacts included changes to ceiling heat flux and attic air temperature which influences loads from unintended attic air leakage and duct heat gain. We also develop an analysis method to estimate total cooling energy benefits of different roofing systems considering the various impacts. The results show that all the options perform better than dark composition shingles. White metal performs best with an estimated cooling energy reduction of about 15%, but the spectrally selective metal shingles (12%) and unfinished Galvalume roofs (11%) do surprisingly well. Galvanized roofing did less well than Galvalume (7% reduction) and worse performance in the second year of exposure was observed due to corrosion of the zinc surface. The sealed attic with a double roof produced an estimated cooling energy reduction of only 2% -- largely due to increases in ceiling flux.

Parker, D. S.; Sherwin, J.; Sonne, J.

2004-01-01T23:59:59.000Z

44

Energy measurements of single-family houses with attics containing radiant barriers  

Science Conference Proceedings (OSTI)

Radiant barriers were tested in attics of three unoccupied research houses which are located near Knoxville, Tennessee. The prime purpose of the testing was to determine the interaction, if any, between two types of radiant barriers, horizontal (barrier laid on top of attic insulation) and truss (barrier attached to underside of roof trusses), and three levels of fiberglass-batt attic insulation, R-11, R-19, and R-30. Testing of radiant barriers with R-19 fiberglass-batt attic insulation was done at the houses in the summer of 1985 and in the winter of 1985-86. The R-11 and R-30 testing was done in the summer of 1986. These results showed that horizontal barriers were more effective than truss barriers in reducing house cooling and heating loads. The summer of 1986 testing showed that increasing the attic insulation from R-11 to R-30 reduced the house cooling load (Btu) by approximately 16%. Adding a horizontal barrier to R-11 also reduced the cooling load compared to R-11 with no barrier by about 16%, while a truss barrier reduced it by 11%. A horizontal barrier with R-30 only reduced the cooling load by 2% compared to R-30 with no barrier, while an increase in the cooling load of 0.7% was measured with a truss barrier and R-30. Radiant barriers were not effective in reducing house cooling loads when R-30 attic insulation was present. The results from the summer of 1985 were integrated into the latest work through the use of a modeling effort using the building load simulation program, DOE-2.1B. This showed that R-19 insulation in conjunction with a horizontal barrier was (for Knoxville) the most effective barrier/insulation combination and could reduce the house cooling load by 25.1% compared to R-11 with no barrier.

Levins, W.P.; Karnitz, M.A.

1987-01-01T23:59:59.000Z

45

Effect of Radiant Barrier Technology on Summer Attic Heat Load in South Texas  

E-Print Network (OSTI)

The objective of the study was to experimentally evaluate the performance of radiant barriers in single-family occupied housing units in South Texas. Ceiling heat fluxes, attic air temperatures, indoor air temperatures, ambient air temperatures. roof temperatures, and solar radiation were measured. Results of the radiant barrier experiment using two side-by-side 600 ft2 units are presented. Attic fiberglass insulation of nominal R-11 was installed in the two apartments when the units were last remodeled in 1974. The test houses responded similarly to weather variations, that is, attic temperature and heat flux profiles were similar in magnitude prior to the retrofit. Residents of the housing units were asked to set the thermostats at 76F. Data were analyzed for periods of time which had the greatest attic temperatures (11 a.m. - 11 p.m.) and for which the indoor temperature differences were less than 1 percent. The results showed that radiant barriers reduced ceiling heat loads (on daily basis) by an average of 60 percent.

Ashley, R.; Garcia, O.; Medina, M. A.; Turner, W. D.

1994-01-01T23:59:59.000Z

46

Heating energy measurements of unoccupied single-family houses with attics containing radiant barriers  

Science Conference Proceedings (OSTI)

Tests were conducted by Oak Ridge National Laboratory (ORNL) to determine the magnitude of the heating energy savings achieved by installing attic radiant barriers. The radiant barriers used for the test consist of a material with two reflective aluminum surfaces on a kraft paper base. The experiment was conducted in three unoccupied research houses operated by ORNL. Two variations in the installation of radiant barriers were studied. One house was used as the control house (no barrier was installed), while the other two were used to test the two methods for installing the radiant barriers. In one house, the radiant barrier was laid on top of the attic fiberglass batt insulation, and in the other house, the barrier was attached to the underside of the roof trusses. The attics of all three houses were insulated with a kraft-paper-faced R-19 fiberglass batt insulation. The winter test with the radiant barrier showed that the horizontal barrier was able to save space-heating electical energy in both the resistance and heat pump modes amounting to 10.1% and 8.5%, respectively. The roof truss radiant barrier increased consumption by 2.6% in the resistance mode and 4.0% in the heat pump mode. The horizontal orientation of the radiant barrier is the more energy-effective method of installation.

Levins, W.P.; Karnitz, M.A.

1987-01-01T23:59:59.000Z

47

Modeling of Residential Attics with Radiant Barriers  

E-Print Network (OSTI)

This paper gives a summary of the efforts at ORNL in modeling residential attics with radiant barriers. Analytical models based on a system of macroscopic heat balances have been developed. Separate models have been developed for horizontal radiant barriers laid on top of the insulation, and for radiant barriers attached to the bottom of the top chords of the attic trusses. The models include features such as a radiation interchange analysis within the attic space, convective coupling with the ventilation air, and sorption/desorption of moisture at surfaces facing the attic enclosure. The paper gives details of the models and the engineering assumptions that were made in their development. The paper also reports on the status of efforts that are underway to verify the models by comparing their predictions with the results of laboratory and field tests on residential attics and test cells, both with and without radiant barriers. Comparisons are given for a number of selected sets of experimental data. Suggestions are given for needed model refinements and additional experimental data. Plans for utilization of the models for extrapolation to seasonal and annual performance in a variety of climatic conditions are also described.

Wilkes, K. E.

1988-01-01T23:59:59.000Z

48

Wall R-values that tell it like it is  

SciTech Connect

The R-value of a whole wall can be considerable lower than the R-value of the insulation that fills it. At DOE`s Buildings Technology Center, scientists have developed a system for measuring whole wall R-value and have already tested several wall systems. Topics covered include the following: how wall r-value is usually calculated; measuring whole-wall r-values; evaluating wall performance; a wall rating label; beyond r-value; r-value terminology. 1 fig., 1 tab.

Christian, J.E. [Oak Ridge National Lab., TN (United States); Kosny, J. [Univ. of Tennessee, Knoxville, TN (United States)

1997-03-01T23:59:59.000Z

49

Solar-assisted electric clothes dryer using a home attic as a heat source  

DOE Green Energy (OSTI)

This study was undertaken to determine the suitability of using a southeastern home attic as a means of reducing the energy consumption of an electric clothes dryer. An inexpensive duct (duplicable for $25) was constructed to collect hot attic air from the peak of a south facing roof and introduce it into the dryer inlet. Instrumentation was added to measure inlet temperatures and operating time/energy consumption of the dryer. Standardized test loads, in addition to normal laundry, were observed over the period of one year. The heat-on time of the dryer tested was shown to be reduced .16 to .35 minutes per /sup 0/C rise in inlet temperature. Inlet temperatures produced by the attic duct peaked at 56/sup 0/C(133/sup 9/F) in May/June and 40/sup 0/C(104/sup 0/F) in February. Based on peak temperatures available between 2 and 4 pm each month, a potential 20% yearly average savings could be realized. Economic viability of the system, dependant primarily on dryer usage, can be computed using a formula derived from the test results and included in the report.

Stana, J.M.

50

Numerical heat transfer attic model using a radiant barrier system  

Science Conference Proceedings (OSTI)

A two-dimensional, steady-state finite-element model was developed to simulate the thermal effects of the application of an attic radiant barrier system (ARBS) inside a ventilated residential attic. The attic is ventilated using the exhaust air from an evaporative cooler. The study uses a {kappa}-{epsilon} turbulent model to describe the velocity and temperature distributions in the attic. The ambient temperature and solar isolation densities on the outside inclined attic surfaces are used as driving functions for the model. The model also included the appropriate heat exchange modes of convection and radiation on these outside surfaces. Several recirculation zones were visually observed in the attic flow pattern. Also, the use of the ARBS seems to lower the heat transfer through the ceiling by 25--30%, but this effect decreases significantly as the outside ventilation rates are increased through the attic space. The 2D model revealed some interesting temperature distributions along the attic surfaces that could not have been predicted by the one-dimensional models. The lower emissivity ARBS seems to raise the temperature of the inclined attic surfaces as well as the temperature of the exhausted ventilation air.

Moujaes, S.F.; Alsaiegh, N.T.

2000-04-01T23:59:59.000Z

51

Analytical study of residential building with reflecting roofs  

SciTech Connect

This report presents an analysis of the effect of roof solar reflectance on the annual heating (cooling) loads, peak heating (cooling) loads, and roof temperatures of the residential buildings. The annual heating (cooling) loads, peak heating (cooling) loads, and exterior roof temperatures for a small compact ranch house are computed using the Thermal Analysis Research Program (TARP). The residential models, with minor modifications in the thermal envelope for different locations, are subjected to hourly weather data for one year compiled in the Weather Year for Energy Calculation (WYEC) for in the following locations: Birmingham, Alabama; Bismarck, North Dakota; Miami, Florida; Phoenix, Arizona; Portland, Maine; and, Washington, D.C. Building loads have been determined for a full factorial experimental design that varies the following parameters of the residential model: solar reflectance of the roof, ceiling thermal resistance, attic ventilation, and attic mass framing area. The computed results for annual heating (cooling) loads and peak heating (cooling) loads are illustrated graphically, both globally for all cities and locally for each geographic location. The effect of peak parameter is ranked (highest to lowest) for effect on annual heating and cooling loads, and peak heating and cooling loads. A parametric study plots the building loads as a function of roof solar reflectance for different levels of ceiling thermal resistances and for each geographic location.

Zarr, R.R.

1998-10-01T23:59:59.000Z

52

Measured R-values for two horizontal reflective cavities in series  

SciTech Connect

The Large Scale Climate Simulator at the DOE-sponsored Roof Research Center has been used to provide data for steady-state temperatures and heat fluxes in two horizontal reflective cavities in series. The cavities have nominal effective emittances of 0.015 and 0.03 and are relatively narrow. The resulting R-values cover a range of mean air temperatures from {minus}5 F to 135 F and temperature differences from 12 F{degree} to 26 F{degree}. The cavities studied had exposed wood sides. The R-values for heat down-flow fall significantly below those for the same nominal emittances in the ASHRAE Handbook of Fundamentals. Values for heat upflow are slightly lower than the ASHRAE data. Analysis of a graybody radiation network for this situation shows that the lower R-values are the effect of non-reflecting sides. It also confirms that the sides should be covered with foil. 5 refs., 7 figs., 2 tabs.

Petrie, T.W.; Courville, G.E.; Childs, P.W.; Shipp, P.H. (Oak Ridge National Lab., TN (USA); USG Corp., Libertyville, IL (USA))

1989-01-01T23:59:59.000Z

53

Analysis of Attic Radiant Barrier Systems Using Mathematical Models  

E-Print Network (OSTI)

During the past six years, the Florida Solar Energy Center (FSEC) has conducted extensive experimental research on radiant barrier systems (RBS). This paper presents recent research on the development of mathematical attic models. Two levels of modeling capability have been developed. A very simplified model based on ASHRAE procedures in used to study the sensitivity of RBS performance parameters, and a very detailed finite element model is used to study highly complex phenomena, including moisture adsorption and desorption in attics. The speed of the simple model allows a large range of attic parameters to be studies quickly, and the finite element model provides a detailed understanding of combined heat and moisture transport in attics. This paper concentrates on a parametric analysis of attic RBS using the simplified model. The development of the model is described, and results of the parametric analyses are presented and discussed. Preliminary results from the finite element model are also compared with measurements from a test attic to illustrate the effects of moisture adsorption and desorption in common attics.

Fairey, P.; Swami, M.

1988-01-01T23:59:59.000Z

54

Thermal Performance of Unvented Attics in Hot-Dry Climates  

DOE Green Energy (OSTI)

As unvented attics become a more common design feature implemented by Building America partners in hot-dry climates of the United States, more attention has been focused on how this approach affects heating and cooling energy consumption. The National Renewable Energy Laboratory (NREL) has conducted field testing and hourly building simulations for several Building America projects to evaluate energy use in vented and unvented attics in hot-dry climates. In summer, testing of the Las Vegas protoype house demonstrated that the thermal performance of an unvented attic is highly dependent on duct leakage.

Hendron, B.; Anderson, R.; Reeves, P.; Hancock, E.

2002-04-01T23:59:59.000Z

55

Roof bolting improvements  

Science Conference Proceedings (OSTI)

Suppliers partner with mine operators to offer safer, more productive tools for roof bolting. 4 figs.

Fiscor, S.

2008-11-15T23:59:59.000Z

56

Effect of attic ventilation on the performance of radiant barriers  

Science Conference Proceedings (OSTI)

The objective of the experiments was to quantify how attic ventilation would affect the performance of a radiant barrier. Ceiling heat flux and space cooling load were both measured. Results of side-by-side radiant barrier experiments using two identical 13.38 m[sup 2] (nominal) test houses are presented in this paper. The test houses responded similarly to weather variations. Indoor temperatures of the test houses were controlled to within 0.2 [degrees] C. Ceiling heat fluxes and space cooling load were within a 2.5 percent difference between both test houses. The results showed that a critical attic ventilation flow rate of 1.3 (1/sec)/m[sup 2] of the attic floor existed after which the percentage reduction in ceiling heat fluxes produced by the radiant barriers did not change with increasing attic airflow rates. The ceiling heat flux reductions produced by the radiant barriers were between 25 and 35 percent, with 28 percent being the percent reduction observed most often in the presence of attic ventilation. The space-cooling load reductions observed were between two to four percent. All results compiled in this paper were for attics with unfaced fiberglass insulation with a resistance level of 3.35 m[sup 2]K/W (nominal) and for a perforated radiant barrier with low emissivities (less than 0.05) on both sides.

Medina, M.A.; O'Neal, D.L. (Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering); Turner, W.D. (Texas A and M Univ., College Station, TX (United States). Coll. of Engineering)

1992-11-01T23:59:59.000Z

57

Cool Roof Colored Materials  

NLE Websites -- All DOE Office Websites (Extended Search)

Cool Roof Colored Materials Cool Roof Colored Materials Speaker(s): Hashem Akbari Date: May 29, 2003 - 12:00pm Location: Bldg. 90 Raising roof reflectivity from an existing 10-20% to about 60% can reduce cooling-energy use in buildings in excess of 20%. Cool roofs also result in a lower ambient temperature that further decreases the need for air conditioning and retards smog formation. Reflective roofing products currently available in the market are typically used for low-sloped roofs. For the residential buildings with steep-sloped roofs, non-white (colored) cool roofing products are generally not available and most consumers prefer colors other than white. In this collaborative project LBNL and ORNL are working with the roofing industry to develop and produce reflective, colored roofing products and make yhrm a market reality within three to

58

Using Green Roofs to Minimize Roof Runoff Pollution  

E-Print Network (OSTI)

comparison for new construction: ­­ Green roofGreen roof -- $10$10--$30 per square foot$30 per square foot ­­ Traditional roofTraditional roof -- $5$5--$15 per square foot$15 per square foot Roof load evaluation required Roof Design ConsiderationsGreen Roof Design Considerations Cost comparison for new construction:Cost

Clark, Shirley E.

59

Photovoltaic roof heat flux  

E-Print Network (OSTI)

many solar installations have basic weather stations. Withthe solar panels. Figure 6: Setup #1 on RIMAC roof. Weather

Samady, Mezhgan Frishta

2011-01-01T23:59:59.000Z

60

Roof-and-attic system delivers year-round efficiency | ornl.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

Center OLCFOak Ridge Leadership Computing Facility SNSSpallation Neutron Source Science & Discovery Advanced Materials Clean Energy National Security Neutron Science Nuclear...

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Roof-and-attic system delivers year-round efficiency | ornl.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

at ORNL improves efficiency using controls for radiation, convection, and insulation, including a passive ventilation system that pulls air from the underbelly of the...

62

Visual Analytics for Roof Savings Calculator Ensembles  

SciTech Connect

The Roof Savings Calculator (RSC) has been deployed for DOE as an industry-consensus, web-based tool for easily running complex building energy simulations. These simulations allow both homeowners and experts to determine building-specific cost and energy savings for modern roof and attic technologies. Using a database of over 3 million RSC simulations for different combinations of parameters, we have built a visual analytics tool to assist in the exploration and identification of features in the data. Since the database contains multiple variables, both categorical and continuous, we employ a coordinated multi-view approach that allows coordinated feature exploration through multiple visualizations at once. The main component of our system, a parallel coordinates view, has been adapted to handle large-scale, mixed data types as are found in RSC simulations. Other visualizations include map coordinated plots, high dynamic range (HDR) line plot rendering, and an intuitive user interface. We demonstrate these techniques with several use cases that have helped identify software and parametric simulation issues.

Jones, Chad [University of California, Davis; New, Joshua Ryan [ORNL; Sanyal, Jibonananda [ORNL; Ma, Kwan-Liu [University of California, Davis

2012-01-01T23:59:59.000Z

63

Moisture Management for High R-Value Walls  

SciTech Connect

The following report explains the moisture-related concerns for High R-value wall assemblies and discusses past Building America research work that informs this study. Hygrothermal simulations were prepared for several common approaches to High R-value wall construction in six cities (Houston, Atlanta, Seattle, St. Louis, Chicago, and International Falls) representing a range of climate zones (2, 3, 4C, 4, 5A, and 7, respectively). The simulations are informed by experience gained from past research in this area and validated by field measurement and forensic experience. The modeling program was developed to assess the moisture durability of the wall assemblies based on three primary sources of moisture: construction moisture, air leakage condensation, and bulk water leakage. The peak annual moisture content of the wood based exterior sheathing was used to comparatively analyze the response to the moisture loads for each of the walls in each given city. Walls which experienced sheathing moisture contents between 20% and 28% were identified as risky, whereas those exceeding 28% were identified as very high risk. All of the wall assemblies perform well under idealized conditions. However, only the walls with exterior insulation, or cavity insulation which provides a hygrothermal function similar to exterior insulation, perform adequately when exposed to moisture loads. Walls with only cavity insulation are particularly susceptible to air leakage condensation. None of the walls performed well when a precipitation based bulk water leak was introduced to the backside of the sheathing, emphasizing the importance of proper flashing details.

Lepage, R.; Schumacher, C.; Lukachko, A.

2013-11-01T23:59:59.000Z

64

Roofing Moisture Tolerance  

NLE Websites -- All DOE Office Websites (Extended Search)

Moisture Control in Low-Slope Roofing: Moisture Control in Low-Slope Roofing: A New Design Requirement A.O. Desjarlais and J.E. Christian, Oak Ridge National Laboratory N. A. Byars, University of North Carolina Charlotte This calculator performs the calculations described in Moisture Control in Low-Slope Roofing: A New Design Requirement. This calculator allows the roofing practitioner to determine if a roofing system design requires a vapor retarder or if the system can be modified to enhance its tolerance for small leaks. To use the calculator, simply supply the following information and click on the "Check Roof" button at the bottom of the form. Insulation Type and Thickness (in inches): Fiberboard Polyisocyanurate 0.5 1.0 1.5 2.0 2.5 3.0 Layer 1 None Fiberboard Polyisocyanurate 0.5 1.0 1.5 2.0 2.5 3.0 Layer 2

65

PERFORMANCE EVALUATION OF A SUSTAINABLE AND ENERGY EFFICIENT RE-ROOFING TECHNOLOGY USING FIELD-TEST DATA  

Science Conference Proceedings (OSTI)

Three test attics were constructed to evaluate a new sustainable method of re-roofing utilizing photo-voltaic (PV) laminates, metal roofing panels, and PCM heat sink in the Envelope Systems Research Apparatus (ESRA) facility in the ORNL campus. Figure 1 is a picture of the three attic roofs located adjacent to each other. The leftmost roof is the conventional shingle roof, followed by the metal panel roof incorporating the cool-roof coating, and third from left is the roof with the PCM. On the PCM roof, the PV panels are seen as well; they're labelled from left-to-right as panels 5, 6 and 7. The metal panel roof consists of three metal panels with the cool-roof coating; in further discussion this is referred to as the infrared reflective (IRR) metal roof. The IRR metal panels reflect the incoming solar radiation and then quickly re-emit the remaining absorbed portion, thereby reducing the solar heat gain of the attic. Surface reflectance of the panels were measured using a Solar Spectrum Reflectometer. In the 0.35-2.0 {mu}m wavelength interval, which accounts for more than 94% of the solar energy, the IRR panels have an average reflectance of 0.303. In the infrared portion of the spectrum, the IRR panel reflectance is 0.633. The PCM roof consists of a layer of macro-encapsulated bio-based PCM at the bottom, followed by a 2-cm thick layer of dense fiberglass insulation with a reflective surface on top, and metal panels with pre-installed PV laminates on top. The PCM has a melting point of 29 C (84.2 F) and total enthalpy between 180 and 190 J/g. The PCM was macro-packaged in between two layers of heavy-duty plastic foil forming arrays of PCM cells. Two air cavities, between PCM cells and above the fiberglass insulation, helped the over-the-deck natural air ventilation. It is anticipated that during summer, this extra ventilation will help in reducing the attic-generated cooling loads. The extra ventilation, in conjunction with the PCM heat sink, are used to minimize thermal stresses due to the PV laminates on sunny days. In PV laminates sunlight is converted into electricity and heat simultaneous. In case of building integrated applications, a relatively high solar absorption of amorphous silicon laminates can be utilized during the winter for solar heating purposes with PCM providing necessary heat storage capacity. However, PV laminates may also generate increased building cooling loads during the summer months. Therefore, in this project, the PCM heat sink was to minimize summer heat gains as well. The PCM-fibreglass-PV assembly and the IRR metal panels are capable of being installed directly on top of existing shingle roofs during re-roofing, precluding the need for recycling or disposal of waste materials. The PV laminates installed on the PCM attic are PVL-144 models from Uni-Solar. Each laminate contains 22 triple junction amorphous silicon solar cells connected in series. The silicon cells are of dimensions 356 mm x 239 mm (14-in. x 9.4-in.). The PVL-144 laminate is encapsulated in durable ETFE (poly-ethylene-co-tetrafluoroethylene) high light-transmissive polymer. Table 1 lists the power, voltage and current ratings of the PVL-144 panel.

Biswas, Kaushik [ORNL; Miller, William A [ORNL; Childs, Phillip W [ORNL; Kosny, Jan [ORNL; Kriner, Scott [Metal Construction Association, Glenview, IL

2011-01-01T23:59:59.000Z

66

Roof Photovoltaic Test Facility  

Science Conference Proceedings (OSTI)

... In addition measurements of diffuse and beam solar irradiance are made by an adjacent meteorological station. The nine PV roofing products ...

2011-11-15T23:59:59.000Z

67

Measure Guideline: Air Sealing Attics in Multifamily Buildings  

SciTech Connect

This Building America Measure Guideline is intended for owners, builders, contractors, homeowners, and other stakeholders in the multifamily building industry, and focuses on challenges found in existing buildings for a variety of housing types. It explains why air sealing is desirable, explores related health and safety issues, and identifies common air leakage points in multifamily building attics. In addition, it also gives an overview of materials and techniques typically used to perform air sealing work.

Otis, C.; Maxwell, S.

2012-06-01T23:59:59.000Z

68

Roof Renovations | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Roof Renovations Roof Renovations Roof Renovations October 16, 2013 - 4:58pm Addthis The roof of a Federal building is a common placement for a number of renewable energy technologies, so they should be addressed anytime a roof renovation is undertaken, including roof-mounted photovoltaics (PV) and solar hot water (SHW) systems that consider structural loads, accessible wiring/plumbing, and available roof space; daylighting, including skylights, clerestories, and solar tubes; and energy-efficient roofing technologies such as vegetative roofs. Renewable Energy Options for Building Envelope Renovations Daylighting Photovoltaics Solar Water Heating (SWH) In a Federal building renovation, a variety of equipment may vie for roof space. Decisions about using roof space should involve a range of

69

Roof bolting equipment & technology  

SciTech Connect

Technology provides an evaluator path to improvement for roof bolting machines. Bucyrus offers three different roof bolts models for various mining conditions. The LRB-15 AR is a single-arm boiler recommended for ranges of 32 inches and above; the dual-arm RB2-52A for ranges of 42 inches and above; and the dual-arm RB2-88A for ranges of 54 inches and above. Design features are discussed in the article. Developments in roof bolting technology by Joy Mining Machinery are reported. 4 photos.

Fiscor, S.

2009-04-15T23:59:59.000Z

70

Photovoltaic roof heat flux  

E-Print Network (OSTI)

of ~24C, indicating that heat conduction was small. T h i sday, indicating large heat conduction a n d storage. Control2.1.3 showed that conduction heat flux through the roof was

Samady, Mezhgan Frishta

2011-01-01T23:59:59.000Z

71

New and Underutilized Technology: High R-Value Windows | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

High R-Value Windows High R-Value Windows New and Underutilized Technology: High R-Value Windows October 8, 2013 - 2:47pm Addthis The following information outlines key deployment considerations for high R-value windows within the Federal sector. Benefits High R-value windows are highly insulated windows rated at triple pane, R5 or greater (U value 0.22 and lower). Application High R-value windows are appropriate for deployment within most building categories. These windows should be considered in building design, renovation, or during window replacement projects. Key Factors for Deployment High R-value windows are available within the Federal sector and should be considered in building design, renovation, or during window replacement projects. The U.S. Department of Energy (DOE) has a volume purchasing program in

72

Energy Savings: Attics by Kristine Solomon, Posted Aug 2nd 2010 1:00PM  

E-Print Network (OSTI)

even more by installing a ridge-and-soffit ventilation system. Page 1 of 2Energy Savings: Attics - DIY's Green Home Guide. Page 2 of 2Energy Savings: Attics - DIY Life 9/14/2010http://www.diylife.com/2010

73

AEDG Implementation Recommendations: Cool Roofs | Building Energy...  

NLE Websites -- All DOE Office Websites (Extended Search)

section of the guide and focus on cool roofs, which are recommended for metal building roofs and roofs with insulation entirely above deck. Publication Date: Wednesday,...

74

Inverted Attic Bulkhead for HVAC Ductwork, Roseville, California (Fact Sheet)  

SciTech Connect

K. Hovnanian Homes constructed a 2,253-ft single-story slab-on-grade ranch house for an occupied test house (new construction) in Roseville, California. One year of monitoring and analysis focused on the effectiveness of the space conditioning system at maintaining acceptable temperature and relative humidity levels in several rooms of the home, as well as room-to-room differences and the actual measured energy consumption by the space conditioning system. In this home, the air handler unit (AHU) and ducts were relocated to inside the thermal boundary. The AHU was relocated from the attic to a mechanical closet, and the ductwork was located inside an insulated and air-sealed bulkhead in the attic. To describe the performance and comfort in the home, the research team selected representative design days and extreme days from the annual data for analysis. To ensure that temperature differences were within reasonable occupant expectations, the team followed Air Conditioning Contractors of America guidance. At the end of the monitoring period, the occupant of the home had no comfort complaints in the home. Any variance between the modeled heating and cooling energy and the actual amounts used can be attributed to the variance in temperatures at the thermostat versus the modeled inputs.

Not Available

2013-10-01T23:59:59.000Z

75

Ducts in the Attic? What Were They Thinking? Preprint  

SciTech Connect

As energy-efficiency efforts focus increasingly on existing homes, we scratch our heads about construction decisions made 30, 40, 50-years ago and ask: 'What were they thinking?' A logical follow-on question is: 'What will folks think in 2050 about the homes we're building today?' This question can lead to a lively discussion, but the current practice that we find most alarming is placing ducts in the attic. In this paper, we explore through literature and analysis the impact duct location has on cooling load, peak demand, and energy cost in hot climates. For a typical new home in these climates, we estimate that locating ducts in attics rather than inside conditioned space increases the cooling load 0.5 to 1 ton, increases cooling costs 15% and increases demand by 0.75 kW. The aggregate demand to service duct loss in homes built in Houston, Las Vegas, and Phoenix during the period 2000 through 2009 is estimated to be 700 MW. We present options for building homes with ducts in conditioned space and demonstrate that these options compare favorably with other common approaches to achieving electricity peak demand and consumption savings in homes.

Roberts, D.; Winkler, J.

2010-08-01T23:59:59.000Z

76

Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cool Roofs Cool Roofs Cool Roofs July 26, 2013 - 10:36am Addthis White painted roofs have been popular since ancient times in places like Greece. Similar technology can be easy to adapt to modern homes and other buildings. | Credit: ©iStockphoto/PhotoTalk White painted roofs have been popular since ancient times in places like Greece. Similar technology can be easy to adapt to modern homes and other buildings. | Credit: ©iStockphoto/PhotoTalk If you live in a hot climate, a cool roof can: Save you money on air conditioning Make your home more comfortable in hot weather How does it work? By making your roof more reflective, you reduce heat gain into your home. Check out these resources for more information. A cool roof is one that has been designed to reflect more sunlight and

77

Solar heating shingle roof structure  

Science Conference Proceedings (OSTI)

A solar heating roof shingle roof structure which combines the functions of a roof and a fluid conducting solar heating panel. Each shingle is a hollow body of the general size and configuration of a conventional shingle, and is provided with a fluid inlet and a fluid outlet. Shingles are assembled in a normal overlapping array to cover a roof structure, with interconnections between the inlets and outlets of successive shingles to provide a fluid path through the complete array. An inlet manifold is contained in a cap used at the peak of the roof and an outlet manifold is connected to the lowest row of shingles.

Straza, G.T.

1984-01-31T23:59:59.000Z

78

BTRIC - Tools & Calculators - ORNL  

NLE Websites -- All DOE Office Websites (Extended Search)

Calculators Calculators Attic Radiant Barrier Calculator Low-Slope Roof Calculator for Commercial Buildings (6/05) - estimates annual energy cost savings Moisture Control for Low-Slope Roofing (5/04) - determine if a roof design needs a vapor retarder or if the roofing system can be modified to enhance its tolerance for small leaks Modified Zone Method Roof Savings Calculator (12/12) - for commerical and residential buildings using whole-building energy simulations Solar Reflectance Index (SRI) Calculator (6/06) Steep-Slope Roof Calculator on Residential Buildings (6/05) - estimate annual energy cost savings Whole-Wall R-Value Calculator 2.0 (10/06) ZIP-Code R-Value Recommendation Calculator (1/08) Roofs/Attics Attic Radiant Barrier Fact Sheet (Jan 2011) Cool Roofs Will Revolutionize the Building Industry Fact Sheet

79

Building America Top Innovations Hall of Fame Profile … Unvented, Conditioned Attics  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

additional heat loss and gain of ducts additional heat loss and gain of ducts in unconditioned, vented attics increases energy use for heating and cooling 10%. Additionally, duct air leakage has been measured to commonly exceed 20% of conditioned air flow, which results in a significant energy loss when ducts are in unconditioned space. In addition to influencing builders across the country to adopt unvented, conditioned attics, Building America research has helped influence code acceptance of this innovation since 2006. BUILDING AMERICA TOP INNOVATIONS HALL OF FAME PROFILE INNOVATIONS CATEGORY: 1. Advanced Technologies and Practices 1.1 Building Science Solutions Unvented, Conditioned Attics The preference for a large segment of the U.S. housing industry has been to locate HVAC systems in unconditioned attics, but this is highly inefficient.

80

Look Up to See Your Bills Go Down: Making Your Attic More Efficient |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Look Up to See Your Bills Go Down: Making Your Attic More Efficient Look Up to See Your Bills Go Down: Making Your Attic More Efficient Look Up to See Your Bills Go Down: Making Your Attic More Efficient July 18, 2011 - 5:29pm Addthis Allison Casey Senior Communicator, NREL This year at my house, we have been on a quest to make our attic more energy efficient. I think we realized just how much this unseen area contributes to our overall comfort -not to mention what we pay to heat and cool the house. The first thing we did was install more insulation this winter. In addition to the tax credits we'll be able to claim, there were several incentives available from our state and utility that made it a great time for us to make this improvement. Following the installation, we noticed an immediate improvement in the overall comfort of our home and the furnace seemed to

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Look Up to See Your Bills Go Down: Making Your Attic More Efficient |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Look Up to See Your Bills Go Down: Making Your Attic More Efficient Look Up to See Your Bills Go Down: Making Your Attic More Efficient Look Up to See Your Bills Go Down: Making Your Attic More Efficient July 18, 2011 - 5:29pm Addthis Allison Casey Senior Communicator, NREL This year at my house, we have been on a quest to make our attic more energy efficient. I think we realized just how much this unseen area contributes to our overall comfort -not to mention what we pay to heat and cool the house. The first thing we did was install more insulation this winter. In addition to the tax credits we'll be able to claim, there were several incentives available from our state and utility that made it a great time for us to make this improvement. Following the installation, we noticed an immediate improvement in the overall comfort of our home and the furnace seemed to

82

Radiant Barrier Insulation Performance in Full Scale Attics with Soffit and Ridge Venting  

E-Print Network (OSTI)

There is a limited data base on the full scale performance of radiant barrier insulation in attics. The performance of RBS have been shown to be dependent on attic ventilation characteristics. Tests have been conducted on a duplex located in Florida with soffit and ridge venting to measure attic performance. The unique features of these experiments are accurate and extensive instrumentation with heat flow meters, field verification of HFM calibration, extensive characterization of the installed ceiling insulation, ventilation rate measurements and extensive temperature instrumentation. The attics are designed to facilitate experimental changes without damaging the installed insulation. RBS performance has been measured for two natural ventilation levels for soffit and ridge venting. Previously, no full scale data have been developed for these test configurations. Test data for each of the test configurations was acquired for a minimum of two weeks with some acquired over a five week period. The Rl9 insulation performed as expected.

Ober, D. G.; Volckhausen, T. W.

1988-01-01T23:59:59.000Z

83

Passive preheating of water-heater feed water (using attic heat)  

DOE Green Energy (OSTI)

Baseboard convectors were installed in a house attic to preheat water prior to entering the home water heater. The system was monitored and not found to be cost effective. (LEW)

Knudsen, E.T. Jr.

1982-01-01T23:59:59.000Z

84

Cool Roofs and Heat Islands  

NLE Websites -- All DOE Office Websites (Extended Search)

(510) 486-7494 Links Heat Island Group The Cool Colors Project Batteries and Fuel Cells Buildings Energy Efficiency Applications Commercial Buildings Cool Roofs and...

85

Cool Colored Roofs to Save Energy and Improve Air Quality  

E-Print Network (OSTI)

Solar Absorptance, Attic, and Duct Insulation on Cooling and Heating Energy Use in Single-Family New Residential Buildings,

Akbari, Hashem; Levinson, Ronnen; Miller, William; Berdahl, Paul

2005-01-01T23:59:59.000Z

86

Status of cool roof standards in the United States  

E-Print Network (OSTI)

solar absorptance, attic, and duct insulation on cooling and heating energy use in single- family new residential buildings.

Akbari, Hashem; Levinson, Ronnen

2008-01-01T23:59:59.000Z

87

Inclusion of cool roofs in nonresidential Title 24 prescriptive requirements  

E-Print Network (OSTI)

modeled without an attic radiant barrier that was present inPre-Coating Condition radiant barrier wood deck ventilated

Levinson, Ronnen; Akbari, Hashem; Konopacki, Steve; Bretz, Sarah

2002-01-01T23:59:59.000Z

88

Literature Review of Uncertainty of Analysis Methods (Cool Roofs), Report to the Texas Commission on Environmental Quality  

E-Print Network (OSTI)

In this literature review, seventy two (72) articles were reviewed from various sources, including: the literature compiled by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE); literature listed on the web sites of the Florida Solar Energy Center (FSEC), the Oak Ridge National Laboratory (ORNL), the National Renewal Energy Laboratory (NREL), the Lawrence Berkeley National Laboratory (LBNL), the American Council for an Energy Efficient Economy (ACEEE), and the publications of Elsevier. Keywords searched were: cool roofs, radiant barrier, highalbedo, attic ventilation, duct, as well as the names of the most prolific authors in this area, Dr. Hashem Akbari (LBNL), and Mr. Danny Parker (FSEC).

Haberl, J. S.; Cho, S.

2004-01-01T23:59:59.000Z

89

1. Large Scale Climate Simulator (Building 3144) The LSCS tests roof and/or attic assemblies weighing up to  

E-Print Network (OSTI)

) The RGHB performs advanced thermal testing of full-size wall/fenestration systems. It accommodates systems content in materials, vapor pressure, temperature, heat flux, humidity, and condensation. 7. MAXLAB MAXLAB. It is adequate for testing in most residential and light commercial buildings. 12. Duct Blaster A Duct Blaster

Oak Ridge National Laboratory

90

An office building used as a federal test bed for energy-efficient roofs  

SciTech Connect

The energy savings benefits of re-covering the roof of an existing federal office building with a sprayed polyurethane foam system are documented. The building is a 12,880 ft{sup 2} (1,197 m{sup 2}), 1 story, masonry structure located at the Oak Ridge National Laboratory (ORNL), Oak Ridge, TN. Prior to re-covering, the roof had a thin fiberglass insulation layer, which had become partially soaked because of water leakage through the failed built-up roof membrane. The average R-value for this roof measured at 2 hr{center_dot}ft{sup 2}{center_dot}{degrees}F/Btu (0.3 m{sup 2} {center_dot}K/W). After re-covering the roof, it measured at 13 hr{center_dot}ft{sup 2}{degrees}F/Btu (2.3 m{sup 2}{center_dot}K/W). The building itself is being used as a test bed to document the benefits of a number of energy efficiency improvements. As such, it was instrumented to measure the half-hourly energy consumption of the whole building and of the individual rooftop air conditioners, the roof heat fluxes and the interior air and roof temperatures. These data were used to evaluate the energy effectiveness of the roof re-covering action. The energy savings analysis was done using the DOE-2.lE building simulation program, which was calibrated to match the measured data. The roof re-covering led to around 10% cooling energy savings and around 50% heating energy savings. The resulting energy cost reductions alone are not sufficient to justify re-covered roofs for buildings having high internal loads, such as the building investigated here. However the energy savings do contribute significantly to the measure`s Savings-to-Investment Ratio (SIR).

McLain, H.A.; Christian, J.E.

1995-08-01T23:59:59.000Z

91

Residential Attic Ventilation In A Hot And Humid Climate: Effects Of Increased Ventilation On Thermal Performance And Moisture Control.  

E-Print Network (OSTI)

?? The reality of the effect of natural ventilation in a residential attic cavity has been the topic of many debates and scholarly reports since (more)

Atherton, Stanley Arthur

2011-01-01T23:59:59.000Z

92

Energy saving potential of various roof technologies  

E-Print Network (OSTI)

Unconventional roof technologies such as cool roofs and green roofs have been shown to reduce building heating and cooling load. Although previous studies suggest potential for energy savings through such technologies, ...

Ray, Stephen D. (Stephen Douglas)

2010-01-01T23:59:59.000Z

93

Green roofs: potential at LANL  

SciTech Connect

Green roofs, roof systems that support vegetation, are rapidly becoming one of the most popular sustainable methods to combat urban environmental problems in North America. An extensive list of literature has been published in the past three decades recording the ecological benefits of green roofs; and now those benefits have been measured in enumerated data as a means to analyze the costs and returns of green roof technology. Most recently several studies have made substantial progress quantifying the monetary savings associated with storm water mitigation, the lessoning of the Urban Heat Island, and reduction of building cooling demands due to the implementation of green roof systems. Like any natural vegetation, a green roof is capable of absorbing the precipitation that falls on it. This capability has shown to significantly decrease the amount of storm water runoff produced by buildings as well as slow the rate at which runoff is dispensed. As a result of this reduction in volume and velocity, storm drains and sewage systems are relieved of any excess stress they might experience in a storm. For many municipalities and private building owners, any increase in storm water mitigation can result in major tax incentives and revenue that does not have to be spent on extra water treatments. Along with absorption of water, vegetation on green roofs is also capable of transpiration, the process by which moisture is evaporated into the air to cool ambient temperatures. This natural process aims to minimize the Urban Heat Island Effect, a phenomenon brought on by the dark and paved surfaces that increases air temperatures in urban cores. As the sun distributes solar radiation over a city's area, dark surfaces such as bitumen rooftops absorb solar rays and their heat. That heat is later released during the evening hours and the ambient temperatures do not cool as they normally would, creating an island of constant heat. Such excessively high temperatures induce heat strokes, heat exhaustion, and pollution that can agitate the respiratory system. The most significant savings associated with green roofs is in the reduction of cooling demands due to the green roof's thermal mass and their insulating properties. Unlike a conventional roof system, a green roof does not absorb solar radiation and transfer that heat into the interior of a building. Instead the vegetation acts as a shade barrier and stabilizes the roof temperature so that interior temperatures remain comfortable for the occupants. Consequently there is less of a demand for air conditioning, and thus less money spent on energy. At LANL the potential of green roof systems has already been realized with the construction of the accessible green roof on the Otowi building. To further explore the possibilities and prospective benefits of green roofs though, the initial capital costs must be invested. Three buildings, TA-03-1698, TA-03-0502, and TA-53-0031 have all been identified as sound candidates for a green roof retrofit project. It is recommended that LANL proceed with further analysis of these projects and implementation of the green roofs. Furthermore, it is recommended that an urban forestry program be initiated to provide supplemental support to the environmental goals of green roofs. The obstacles barring green roof construction are most often budgetary and structural concerns. Given proper resources, however, the engineers and design professionals at LANL would surely succeed in the proper implementation of green roof systems so as to optimize their ecological and monetary benefits for the entire organization.

Pacheco, Elena M [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

94

Measuring mine roof bolt strains  

DOE Patents (OSTI)

A mine roof bolt and a method of measuring the strain in mine roof bolts of this type are disclosed. According to the method, a flat portion on the head of the mine roof bolt is first machined. Next, a hole is drilled radially through the bolt at a predetermined distance from the bolt head. After installation of the mine roof bolt and loading, the strain of the mine roof bolt is measured by generating an ultrasonic pulse at the flat portion. The time of travel of the ultrasonic pulse reflected from the hole is measured. This time of travel is a function of the distance from the flat portion to the hole and increases as the bolt is loaded. Consequently, the time measurement is correlated to the strain in the bolt. Compensation for various factors affecting the travel time are also provided.

Steblay, Bernard J. (Lakewood, CO)

1986-01-01T23:59:59.000Z

95

Solar heating shingle roof structure  

Science Conference Proceedings (OSTI)

A solar heating roof shingle roof structure which combines the functions of a roof and a fluid conducting solar heating panel. Each shingle is a hollow body of the general size and configuration of a conventional shingle, and is provided with a fluid inlet socket at the upper end and a fluid outlet plug at the lower end with a skirt at the lower end overlapping the plug. Shingles are assembled in an overlapping array to cover a roof structure, with interconnections between the inlets and outlets of successive longitudinally positioned shingles to provide fluid paths through the complete array. An inlet manifold is positioned at the upper end of the array or in the alternative contained in a cap used at the peak of the roof and an outlet manifold is connected to the outlet of the lowest row of shingles.

Straza, G.T.

1981-01-13T23:59:59.000Z

96

Cool roofs could save money, save planet  

NLE Websites -- All DOE Office Websites (Extended Search)

Cool roofs could save money, save planet Title Cool roofs could save money, save planet Publication Type Broadcast Year of Publication 2009 Authors Akbari, Hashem, and Arthur H....

97

Aging of reflective roofs: soot deposition  

NLE Websites -- All DOE Office Websites (Extended Search)

Aging of reflective roofs: soot deposition Title Aging of reflective roofs: soot deposition Publication Type Journal Article Year of Publication 2002 Authors Berdahl, Paul, Hashem...

98

OCR Solar Roofing Inc | Open Energy Information  

Open Energy Info (EERE)

Facebook icon Twitter icon OCR Solar Roofing Inc Jump to: navigation, search Name OCR Solar & Roofing Inc Place Vacaville, California Product US installer of turnkey PV...

99

An attic-interior infiltration and interzone transport model of ahouse  

Science Conference Proceedings (OSTI)

A detailed model is developed for predicting the ventilation rates of the indoor, conditioned zone of a house and the attic zone. The complete set of algorithms is presented in a form for direct incorporation in a two zone ventilation model. One of the important predictions from this model is the leakage flow rate between the indoor and attic zones. Ventilation rates are predicted from a steady state mass flow rate balance for each zone where all individual flow rates through leakage sites are based on a power law expression for flow rate versus pressure difference. The envelope leakage includes distributed leakage associated with background leakage, localized leakage associated with vents and flues, and active fan ventilation. The predicted ventilation rates agree quite well with field measurements of ventilation rates in houses and attics with different leakage configurations, without the use of any empirically adjusted parameters or constants.

Walker, Iain S.; Forest, Tom W.; Wilson, David J.

2004-08-01T23:59:59.000Z

100

Effects of Radiant Barrier Systems on Ventilated Attics in a Hot and Humid Climate  

E-Print Network (OSTI)

Results of side-by-side radiant barrier experiments using two identical 144 ft2 (nominal) test houses are presented. The test houses responded very similarly to weather variations prior to the retrofit. The temperatures of the test houses were controlled to within 0.3F. Ceiling heat fluxes were within 2 percent for each house. The results showed that a critical attic ventilation flow rate (0.25 CFM/ft2 ) existed after which the percentage reduction produced by the radiant barrier systems was not sensitive to increased airflows. The ceiling heat flux reductions produced by the radiant barrier systems were between 25 and 34 percent, with 28 percent being the reduction observed most often in the presence of attic ventilation. All results presented in this paper were for attics with R-19 unfaced fiberglass insulation and for a perforated radiant barrier with low emissivities on both sides.

Medina, M. A.; O'Neal, D. L.; Turner, W. D.

1992-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cool Roofs Cool Roofs Energy 101: Cool Roofs Addthis Below is the text version for the Energy 101: Cool Roofs video. The video opens with "Energy 101: Cool Roofs." This is followed by images of residential rooftops. Maybe you've never given much thought about what color your roof is, or what it's made of. But your roof could be costing you more money than you know to cool your home or office building, especially if you live in a warmer climate. The video shows pedestrians walking on a city street. Think about it this way... in the summertime we wear light-colored clothes because they keep us cooler. Lighter colors reflect - rather than absorb - the heat of the sun. The video shows images of a white roof. It's the same with your roof. A cool roof is often light in color and made

102

Cool Roofs: An Introduction | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cool Roofs: An Introduction Cool Roofs: An Introduction Cool Roofs: An Introduction August 9, 2010 - 4:43pm Addthis Erin R. Pierce Erin R. Pierce Digital Communications Specialist, Office of Public Affairs Lately, I've been hearing a lot about cool roof technologies, so I welcomed the chance to learn more at a recent seminar. Cool roofs, also referred to as white roofs, have special coatings that reflect sunlight and emit heat more efficiently than traditional roofs, keeping them cooler in the sun. Cool roofing technologies can be implemented quickly and at a relatively low cost, making it the fastest growing sector of the building industry. U.S. Department of Energy Secretary Steven Chu is among the many cool roof enthusiasts. The Secretary recently announced plans to install cool roofs

103

Cool Roofs: An Introduction | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Roofs: An Introduction Roofs: An Introduction Cool Roofs: An Introduction August 9, 2010 - 4:43pm Addthis Erin R. Pierce Erin R. Pierce Digital Communications Specialist, Office of Public Affairs Lately, I've been hearing a lot about cool roof technologies, so I welcomed the chance to learn more at a recent seminar. Cool roofs, also referred to as white roofs, have special coatings that reflect sunlight and emit heat more efficiently than traditional roofs, keeping them cooler in the sun. Cool roofing technologies can be implemented quickly and at a relatively low cost, making it the fastest growing sector of the building industry. U.S. Department of Energy Secretary Steven Chu is among the many cool roof enthusiasts. The Secretary recently announced plans to install cool roofs

104

Green Roofs - Federal Technology Alert  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

roof of the 12- story Chicago City Hall building has been retrofitted with a 22,000-square-foot rooftop garden. The primary goal of this installation, which was completed in...

105

Success Stories: Cool Color Roofs  

NLE Websites -- All DOE Office Websites (Extended Search)

instead of absorbing, solar heat. So the question for scientists interested in increasing energy efficiency is, can one make a roof that is both cool and dark? Hashem Akbari, Paul...

106

Advanced Insulation for High Performance Cost-effective Wall, Roof, and  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Advanced Insulation for High Performance Advanced Insulation for High Performance Cost-effective Wall, Roof, and Foundation Systems Research Project Advanced Insulation for High Performance Cost-effective Wall, Roof, and Foundation Systems Research Project The U.S. Department of Energy (DOE) is currently conducting research into advanced insulation for high performance wall, roof, and foundation systems. Heat flows from hotter to colder spaces, and insulation is designed to resist this flow by keeping hot air out in the summer and in during the winter. Project Description This project seeks to develop high performing, durable, hydrofluorocarbon and hydrochlorofluorocarbons -free insulation with an R-value greater than 7.5-per-inch and a Class A fire performance. Project Partners Research is being undertaken between DOE and Dow Chemical.

107

Laboratory measurements of the drying rates of low-slope roofing systems  

Science Conference Proceedings (OSTI)

The service life of a roofing system typically ends when excessive amounts of water have entered the system. Roofing professionals determine whether the existing failed roofing system can be repaired or salvaged by recovering. A key element in this decision is whether the accumulated water will be able to leave the roofing system in a time frame that will prevent irreparable structural damage. There are several combined heat and mass transfer models that can be used to predict drying times for low-slope roofing systems. Very little experimental data exists that can be used to validate the performance of these models. To satisfy these needs, a series of laboratory experiments has been performed. Five test panels, comprised of a plywood deck, four types of roofing insulation, and a single ply membrane were installed in a climate simulator. The test panels were outfitted with temperature sensors and heat flux transducers, and were mounted on load cells. Water was added to the test panels and they were subjected to external diurnal cycles representative of summer and winter conditions for a southern US continental climate. The load cells supplied continuous records of the weights of the test panels; these data were used to compute the drying rates of the test panels. When these experiments were completed, the test panels were ``recovered`` with different thicknesses of insulation and the environmental conditions were reapplied to the test panels. This paper reports on the design and performance of these experiments. The data compiled during these tests supply insight into the effects of meteorological conditions, insulation R-value, insulation water vapor permeance, and roof recover on the rate that water will be removed from low-slope roofing systems.

Desjarlais, A.O.; Kyle, D.M.; Childs, P.W.; Christian, J.E.

1994-05-01T23:59:59.000Z

108

Green Roof Media Selection forGreen Roof Media Selection for the Minimization of Pollutantthe Minimization of Pollutant  

E-Print Network (OSTI)

-- $10$10--$30 per square foot$30 per square foot ­­ Traditional roofTraditional roof -- $5$5--$15 per square foot$15 per square foot Roof load evaluation required for retrofitsRoof load evaluation requiredPersonalize property Increased valueIncreased value Increased roof lifeIncreased roof life Decreased roofing costs

Clark, Shirley E.

109

Microsoft PowerPoint - Cool Roofs_090804  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

for: for: Quarterly Facilities and Infrastructure Meeting Presented by: The Office of Engineering and Construction Management Content Excerpted From Presentation of: Bob Schmidt - NNSA Kansas City Plant Cool Roofs - An Overview August 4, 2009 2 *The terms "white roof" and "cool roof" are often mistakenly used interchangeably. A white roof is not necessarily a cool roof and a cool roof is not necessarily white. *"Cool Roofs" come in many style as defined by industry standard and can include: Metal Single ply Modified bitumen Acrylic coated White Roof vs. Cool Roof 3 Solar reflectance alone can significantly influence surface temperature, with the white stripe on the brick wall about 5 to 10° F (3-5° C) cooler than the surrounding, darker

110

DOE Science Showcase - Cool roofs, cool research, at DOE | OSTI...  

Office of Scientific and Technical Information (OSTI)

Accelerator returns cool roof documents from 6 DOE Databases Executive Order on Sustainability Secretary Chu Announces Steps to Implement One Cool Roof Cool Roofs Lead to Cooler...

111

Roof screening for underground coal mines: recent developments  

Science Conference Proceedings (OSTI)

The use of screens to control falls of the immediate roof or roof skin (that is between the installed primary and secondary roof supports) is described. 5 figs.

Compton, C.S.; Gallagher, S.; Molinda, G.M.; Mark, C.; Wilson, G.

2008-06-15T23:59:59.000Z

112

DOE Solar Decathlon: 2005 Feature Article - The Green Roof: Thinking...  

NLE Websites -- All DOE Office Websites (Extended Search)

a leader in green roof research, technology and usage, where an estimated 10% of all flat roofs are green. MSU's Green Roof Research Program was initiated in collaboration...

113

Hotbox Test R-value Database from ORNL's Building Technology Center  

DOE Data Explorer (OSTI)

The Building Envelopes Program at Oak Ridge National Laboratory (ORNL) is a program within the Buildings Technology Center (BTC), the premier U.S. research facility devoted to developing technologies that improve the energy efficiency and environmental compatibility of residential and commercial buildings. Our program is divided into two parts: building envelope research, which focuses on the structural elements that enclose a building (walls, roofs and foundations), and materials research, which concentrates on the materials within the envelope systems (such as insulation). The building envelope provides the thermal barrier between the indoor and outdoor environment, and its elements are the key determinants of a building's energy requirements that result from the climate where it is located. [copied from http://www.ornl.gov/sci/roofs+walls/

114

Review and comparison of web- and disk-based tools for residential energy analysis  

E-Print Network (OSTI)

recommendation; moisture; radiant barrier selection. WouldRoof Attic radiant barrier Roof color, reflectance, or

Mills, Evan

2002-01-01T23:59:59.000Z

115

Comparison of energy modeling and laboratory tests on green roof potential to decrease the cooling demand for North European office buildings  

Science Conference Proceedings (OSTI)

Greenroofs have been shown to reduce the rooftop heat transfer, offering enhancement to a building's thermal resistance or R-value in warm climate zones. However a comprehensive study of neither the magnitude of that effect, nor the impact of green roof ... Keywords: cooling load, energy efficiency, energy modeling, greenroofs

Hendrik Voll; Teet-Andrus Kiv

2011-05-01T23:59:59.000Z

116

Guidelines for Selecting Cool Roofs  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

BUILDING TECHNOLOGIES PROGRAM BUILDING TECHNOLOGIES PROGRAM Guidelines for Selecting Cool Roofs July 2010 V. 1.2 Prepared by the Fraunhofer Center for Sustainable Energy Systems for the U.S. Department of Energy Building Technologies Program and Oak Ridge National Laboratory under contract DE-AC05-00OR22725. Additional technical support provided by Lawrence Berkeley National Laboratory and the Federal Energy Management Program. Authors: Bryan Urban and Kurt Roth, Ph.D. ii Table of Contents Introduction ..................................................................................................................................... 3 Why Use Cool Roofs .............................................................................................................. 3

117

Accelerated Aging of Roofing Surfaces  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Accelerated aging of roofing surfaces Accelerated aging of roofing surfaces Hugo Destaillats, Ph.D. Lawrence Berkeley National Laboratory HDestaillats@LBL.gov (510) 486-5897 http://HeatIsland.LBL.gov April 4, 2013 Development of Advanced Building Envelope Surface Materials & Integration of Artificial Soiling and Weathering in a Commercial Weatherometer New York Times, 30 July 2009 2010 2012 Challenge: speed the development of high performance building envelope materials that resist soiling, maintain high solar reflectance, and save energy 2 | Building Technologies Office eere.energy.gov

118

One Cool Roof | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

One Cool Roof One Cool Roof One Cool Roof November 9, 2010 - 10:28am Addthis Deputy Director Salmon Deputy Director, Resource Management The Office of Science occupies many buildings around the country, but it owns only two of them. One of them is making some news. The 134,629 sq. ft. (about 3 acres) roof of the Office of Scientific and Technical Information (OSTI) building in Oak Ridge, Tennessee is now officially a "Cool Roof" -- making it energy efficient in ways that darker roofs are not. Cool roofs are light in color, and therefore, reflect rather than absorb sunlight. The previous roof was black, but worse, it was leaky and those leaks, controlled for years in some very innovative ways by the OSTI staff, were going to cause significant problems if not addressed. OSTI needed to invest

119

SolarRoofs com | Open Energy Information  

Open Energy Info (EERE)

SolarRoofs com Jump to: navigation, search Name SolarRoofs.com Place Carmichael, California Zip 95608 Sector Solar Product California-based manufacturer of the patented Skyline...

120

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

roof when it came time to replace the roofing at our Washington, D.C. headquarters - an investment that's projected to cut thousands of dollars off our utility bills each year....

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Aging and weathering of cool roofing membranes  

E-Print Network (OSTI)

and L.S. Rose. 2002. Aging of reflective roofs: sootAging and Weathering of Cool Roofing Membranes HashemNRC), Canada ABSTRACT Aging and weathering can reduce the

2005-01-01T23:59:59.000Z

122

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cool Roofs Cool Roofs Energy 101: Cool Roofs Addthis Description This edition of Energy 101 takes a look at how switching to a cool roof can save you money and benefit the environment. Duration 2:17 Topic Tax Credits, Rebates, Savings Heating & Cooling Commercial Heating & Cooling Credit Energy Department Video MR. : Maybe you've never given much thought about what color your roof is or what it's made of, but your roof could be costing you more money than you know to cool your home or office building, especially if you live in a warmer climate. Think about it this way: In the summertime, we wear light-colored clothes because they keep us cooler. Lighter clothes reflect rather than absorb the heat of the sun. It's the same with your roof. A cool roof is

123

TASK 2.5.7 FIELD EXPERIMENTS TO EVALUATE COOL-COLORED ROOFING  

Science Conference Proceedings (OSTI)

Aesthetically pleasing dark roofs can be formulated to reflect like a highly reflective white roof in the near infrared portion of the solar spectrum. New paint pigments increase the near infrared reflectance of exterior finishes by minimizing the absorption of near-infrared radiation (NIR). The boost in the NIR reflectance drops the surface temperatures of roofs and walls, which in turn reduces cooling-energy use and provides savings for the homeowner and relief for the utilities. In moderate and hot climates, a roof surface with high solar reflectance and high thermal emittance was shown by Akbari et al. (2004) and by Parker and Sherwin (1998) to reduce the exterior temperature and produce savings in comfort cooling. The new cool color pigments can potentially reduce emissions of carbon dioxide, which in turn reduces metropolitan heat buildup and urban smog. The pigments can also help conserve water resources otherwise used to clean and process fuel consumed by fossil-fuel driven power plants. Cool roofs also result in a lower ambient temperature that further decreases the need for air conditioning, retards smog formation, and improves thermal comfort. Parker, Sonne and Sherwin (2002) demonstrated that white barrel and white flat tiles reduced cooling energy consumption by 22% of the base load used by an adjacent and identical home having direct nailed dark shingles. Part of the savings was due to the reflectance of the white tiles; however, another part was due to the mass of the tile and to the venting occurring within the double batten installation. With, Cherry and Haig (2009) have studied the influence of the thermal mass and batten space ventilation and have found that, referenced to an asphalt shingle system, it can be equivalent to an additional 28 points of solar reflectivity. The double batten arrangement has wooden counter battens laid vertically (soffit-to-ridge) against the roof deck, and then the conventional battens are laid horizontally across the counter battens, providing a nailing surface for the concrete tile. This double batten construction forms an inclined air channel running from the soffit to the ridge. The bottom surface of the channel is formed by the roof decking and is relatively flat and smooth. The top surface is created by the underside of the roofing tiles, and is designed to be an air permeable covering to alleviate the underside air pressure and minimize wind uplift on the tiles. The resulting air flows also have a cooling influence which further complicates prediction of the heat penetrating through the deck because an accurate measure of the airflow is required to predict the heat transfer. Measured temperatures and heat flows at the roof surface, within the attic and at the ceiling of the houses are discussed as well as the power usage to help gauge the benefit of cool-pigmented reflective roof products fitted with and without ventilation above the roof deck. Ventilation occurring above the deck is an inherent feature for tile roof assemblies, and is formed by an air space between the exterior face of the roof sheathing and the underside of the tile. The greater the tile s profile the greater is the effect of the ventilation which herein is termed above-sheathing ventilation (ASV). However, because of the complexity of the thermally induced flow, little credit is allowed by state and federal building codes. ASHRAE (2005) provides empirical data for the effective thermal resistance of plane air spaces. A -in. (0.0191-m) plane air space inclined at 45 with the horizontal has an RUS-0.85 (RSI-0.15) . Our intent is to help further deploy cool color pigments in roofs by conducting field experiments to evaluate the new cool-colored roofing materials in the hot climate of Southern California. The collected data will be used to showcase and market the performance of new cool-roof products and also to help formulate and validate computer codes capable of calculating the heat transfer occurring within the attic and the whole building. Field measures and computer predictions showed that the d

Miller, William A [ORNL; Cherry, Nigel J [ORNL; Allen, Richard Lowell [ORNL; Childs, Phillip W [ORNL; Atchley, Jerald Allen [ORNL; Ronnen, Levinson [Lawrence Berkeley National Laboratory (LBNL); Akbari, Hashem [Lawrence Berkeley National Laboratory (LBNL); Berhahl, Paul [Lawrence Berkeley National Laboratory (LBNL)

2010-03-01T23:59:59.000Z

124

SOLAR ROOF POWERS THE NJIT CAMPUS CENTER  

E-Print Network (OSTI)

SOLAR ROOF POWERS THE NJIT CAMPUS CENTER THE SKY'S THE LIMIT: BERNADETTE MOKE SITS ON THE ROOF, ARE 160 SOLAR PANELS, SOME OF WHICH AUTOMATICALLY FOLLOW THE PATH OF THE SUN. 10 NJITMAGAZINE COVER STORY'S THE LIMIT: SOLAR ROOF POWERS THE NJIT CAMPUS CENTER "The solar panels even move a little at night," says

Bieber, Michael

125

Roofing shingle assembly having solar capabilities  

Science Conference Proceedings (OSTI)

A roofing shingle assembly having solar capabilities comprising a flat main portion having upper and lower surfaces, and curved segments integral with the upper and lower edges of said shingle. The roofing shingles are mounted in overlapping parallel array with the curved segments interconnected to define a fluid conduit enclosure. Mounting brackets for the shingles are secured on the roof rafters.

Murphy, J.A.

1982-03-16T23:59:59.000Z

126

Passive solar roof ice melter  

Science Conference Proceedings (OSTI)

An elongated passive solar roof ice melter is placed on top of accumulated ice and snow including an ice dam along the lower edge of a roof of a heated building and is held against longitudinal movement with respect to itself. The melter includes a bottom wall having an upper surface highly absorbent to radiant solar energy; a first window situated at right angles with respect to the bottom wall, and a reflecting wall connecting the opposite side edges of the bottom wall and the first window. The reflecting wall has a surface facing the bottom wall and the window which is highly reflective to radiant solar energy. Radiant solar energy passes through the first window and either strikes the highly absorbent upper surface of the bottom wall or first strikes the reflecting wall to be reflected down to the upper surface of the bottom wall. The heat generated thereby melts through the ice below the bottom wall causing the ice dam to be removed between the bottom wall and the top of the roof and immediately adjacent to the ice melter along the roof. Water dammed up by the ice dam can then flow down through this break in the dam and drain out harmlessly onto the ground. This prevents dammed water from seeping back under the shingles and into the house to damage the interior of the house.

Deutz, R.T.

1981-09-29T23:59:59.000Z

127

Evaluation of Roof Bolting Requirements Based on In-Mine Roof Bolter Drilling  

SciTech Connect

Roof bolting is the most popular method for underground openings in the mining industry, especially in the bedded deposits such as coal. In fact, all U.S. underground coal mine entries are roof-bolted as required by law. However, roof falls still occur frequently in the roof bolted entries. The two possible reasons are: the lack of knowledge of and technology to detect the roof geological conditions in advance of mining, and lack of roof bolting design criteria for modern roof bolting systems. This research is to develop a method for predicting the roof geology and stability condition in real time during roof bolting operation. Based on this information, roof bolting design criteria for modern roof bolting systems will be developed for implementation in real time. For the prediction of roof geology and stability condition in real time, a micro processor was used and a program developed to monitor and record the drilling parameters of roof bolter. These parameters include feed pressure, feed flow (penetration rate), rotation pressure, rotation rate, vacuum pressure, oil temperature of hydraulic circuit, and signals for controlling machine. From the results of a series of laboratory and underground tests so far, feed pressure is found to be a good indicator for identifying the voids/fractures and estimating the roof rock strength. The method for determining quantitatively the location and the size of void/fracture and estimating the roof rock strength from the drilling parameters of roof bolter was developed. Also, a set of computational rules has been developed for in-mine roof using measured roof drilling parameters and implemented in MRGIS (Mine Roof Geology Information System), a software package developed to allow mine engineers to make use of the large amount of roof drilling parameters for predicting roof geology properties automatically. For the development of roof bolting criteria, finite element models were developed for tensioned and fully grouted bolting designs. Numerical simulations were performed to investigate the mechanisms of modern roof bolting systems including both the tension and fully grouted bolts. Parameters to be studied are: bolt length, bolt spacing, bolt size/strength, grout annulus, in-situ stress condition, overburden depth, and roof geology (massive strata, fractured, and laminated or thinly-bedded). Based on the analysis of the mechanisms of both bolting systems and failure modes of the bolted strata, roof bolting design criteria and programs for modern roof bolting systems were developed. These criterion and/or programs were combined with the MRGIS for use in conjunction with roof bolt installation.

Syd S. Peng

2005-10-01T23:59:59.000Z

128

Tips: Energy-Efficient Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Energy-Efficient Roofs Energy-Efficient Roofs Tips: Energy-Efficient Roofs April 24, 2012 - 4:29pm Addthis Tips: Energy-Efficient Roofs If you've ever stood on a roof on a hot summer day, you know how hot it can get. The heat from your roof makes your air conditioner work even harder to keep your home cool. Cool Roofs If you are building a new home, decide during planning whether you want a cool roof, and if you want to convert an existing roof, you can: Retrofit the roof with specialized heat-reflective material. Re-cover the roof with a new waterproofing surface (such as tile coating). Replace the roof with a cool one. A cool roof uses material that is designed to reflect more sunlight and absorb less heat than a standard roof. Cool roofs can be made of a highly reflective type of paint, a sheet covering, or highly reflective tiles or

129

Rain on the Roof-Evaporative Spray Roof Cooling  

E-Print Network (OSTI)

This paper describes evaporative spray roof cooling systems, their components, performance and applications in various climates and building types. The evolution of this indirect evaporative cooling technique is discussed. Psychrometric and sol-air principles are covered and a simplified method of evaluation presented. A life cycle energy savings example is discussed. Benefits of roof life and roof top equipment efficiency and maintenance are covered as well as water consumption and performance trade-offs with alternate methods of roof heat gain control. Testimonials and case studies are presented. The gradual migration of business, industry, and populace to the southern United States was largely brought on by the advent of the practical air-conditioner, cheap electricity, and the harshness of northern winters. But while "wintering at Palm Beach" has been replaced by "Sun Belt industries" ; the compression-refrigeration cooling cycle is about the only thing separating millions of southerners (native and adopted) from August heat stroke and the Detroit News employment ads. This migration has been spurred by economic recessions which hit harder at the competitively populated northern centers than at the still growing industries of the south. These trends are important illustrations of the concern for efficient cooling strategies. Not only are homes in hot climates vulnerable to the now not-so-low cost of electricity but large, compact. and heavily occupied buildings (offices, schools, hospitals, theaters, etc.) often must air-condition year-around. In 1968. air-conditioning was 3% of U.S. end energy consumption compared to 18% for space heating and 25% for transportation. By 1980, according to Electric Power Research Institute's Oliver Yu, air-conditioning use was 12.5% of all electricity generated and by the year 2000 is projected to reach 16.7% "as migration slows and the GNP reaches a stable 3% growth rate" (EPRI 1982 to 1986 Overview and Strategy). Of further significance is the effect of air-conditioning loads on the peak generating requirements of electrical utilities. Because utilities must build generating capacity to meet peak requirements, they normally charge a higher summer kWh rate (for residential) and levy a peak kW demand charge on a monthly or even annual "ratchet" rate (for larger service customers). The June '83 cover of Houston City Magazine, in reference to future electrical rates, promised: "Pay or Sweat". Typical of many cooling or heat gain prevention strategies being employed on "innovative" buildings in warm climates, evaporative spray roof cooling (ESRC) systems (not to be confused with roof ponds) are not new. Like ventilated structures, ice house roofs, enhanced ventilation, masonry walls, night sky radiation and ground contact cooling, evaporative cooling in many forms has been around for centuries. (See Solar Age, July '82 and February '81 for related articles). Even the development of roof spray systems is not as newly founded as one might suspect.

Bachman, L. R.

1985-01-01T23:59:59.000Z

130

Why Cool Roofs? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Why Cool Roofs? Why Cool Roofs? Why Cool Roofs? Addthis Description By installing a cool roof at DOE, the federal government and Secretary Chu are helping to educate families and businesses about the important energy and cost savings that can come with this simple, low-cost technology. Cool roofs have the potential to quickly and dramatically reduce global carbon emissions while saving money every month on consumers' electrical bills. Speakers Secretary Steven Chu Duration 1:46 Topic Tax Credits, Rebates, Savings Commercial Weatherization Commercial Heating & Cooling Fossil Oil Credit Energy Department Video SECRETARY OF ENERGY STEVEN CHU: The reason we wanted the Department of Energy to take the lead in cool roofs is to demonstrate that this really saves money. If you have a roof and it's black, it's absorbing energy from the sun

131

Cool Roofs | Y-12 National Security Complex  

NLE Websites -- All DOE Office Websites (Extended Search)

Cool Roofs Cool Roofs Cool Roofs Posted: July 18, 2012 - 1:59pm | Y-12 Report | Volume 9, Issue 1 | 2012 Hot, sunny days call for light-colored clothing to reflect the heat. As it turns out, the same principle works for roofs. Consider the results from a Lawrence Berkeley National Laboratory study in Austin, Texas, which measured a dark roof to average a whopping 43 degrees hotter than a light roof. The hotter the roof, the hotter the building becomes, and the more air-conditioning is needed - 11 percent, in that particular study. That in turn puts more carbon dioxide into the atmosphere. Higher atmospheric temperatures also affect atmospheric chemistry, causing higher ozone levels and more smog. Turning down the heat can be both inexpensive and simple, however: replace

132

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Energy 101: Cool Roofs Energy 101: Cool Roofs Energy 101: Cool Roofs February 1, 2011 - 10:50am Addthis John Schueler John Schueler Former New Media Specialist, Office of Public Affairs Editor's Note: This entry has been cross-posted from DOE's Energy Blog. In this edition of Energy 101 we take a look at one of Secretary Chu's favorite energy efficiency techniques, cool roofs. Traditional dark-colored roofing materials absorb a great deal of sunlight, which in turn transfers heat to a building. Cool roofs use light-colored, highly reflective materials to regulate building temperatures without increasing electricity demand, which can result in energy savings of up to 10 to 15 percent. Cool roofs can also reduce the "heat island" effect in cities and suburbs, a phenomenon that produces higher temperatures in densely populated areas

133

Million Solar Roofs Flyer (Revision)  

SciTech Connect

The Million Solar Roofs Initiative, announced in June 1997, assists businesses and communities in installing solar energy systems on one million buildings across the United States by 2010. The US Department of Energy leads this trailblazing initiative by partnering with the building industry, local governments, state agencies, the solar industry, electric service providers, and non-governmental organizations to remove barriers and strengthen the demand for solar technologies.

Not Available

2000-11-01T23:59:59.000Z

134

A transient heat and mass transfer model of residential attics used to simulate radiant barrier retrofits. Part 1: Development  

SciTech Connect

This paper describes a transient heat and mass transfer model of residential attics. The model is used to predict hourly ceiling heat gain/loss in residences with the purpose of estimating reductions in cooling and heating loads produced by radiant barriers. The model accounts for transient conduction, convection, and radiation and incorporates moisture and air transport across the attic. Environmental variables, such as solar loads on outer attic surfaces and sky temperatures, are also estimated. The model is driven by hourly weather data which include: outdoor dry bulb air temperature, horizontal solar and sky radiation, wind speed and direction, relative humidity (or dew point), and cloud cover data. The output of the model includes ceiling heat fluxes, inner and outer heat fluxes from all surfaces, inner and outer surface temperatures, and attic dry bulb air temperatures. The calculated fluxes have been compared to experimental data of side-by-side testing of attics retrofit with radiant barriers. The model predicts ceiling heat flows with an error of less than 10% for most cases.

Medina, M.A. [Texas A and M Univ., Kingsville, TX (United States). Dept. of Mechanical and Industrial Engineering; O`Neal, D.L. [Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering; Turner, W.D. [Texas Engineering Experiment Station, College Station, TX (United States). Energy Systems Lab.

1998-02-01T23:59:59.000Z

135

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cool Roofs Cool Roofs Energy 101: Cool Roofs January 31, 2011 - 12:38pm Addthis This edition of Energy 101 takes a look at how switching to a cool roof can save you money and benefit the environment. John Schueler John Schueler Former New Media Specialist, Office of Public Affairs How does it work? Dark-colored roofing materials absorb a great deal of sunlight, which transfers heat into a building. This can also cause the "heat island" effect in cities and suburbs, a phenomenon that produces higher temperatures in densely populated areas due to extensive changes in the landscape. Cool roofs use light-colored, highly reflective materials to regulate building temperatures without increasing electricity demand, which can result in energy savings of up to 10 to 15 percent.

136

List of Roofs Incentives | Open Energy Information  

Open Energy Info (EERE)

List of Roofs Incentives List of Roofs Incentives Jump to: navigation, search The following contains the list of 178 Roofs Incentives. CSV (rows 1 - 178) Incentive Incentive Type Place Applicable Sector Eligible Technologies Active AEP (Central and North) - CitySmart Program (Texas) Utility Rebate Program Texas Commercial Industrial Institutional Local Government Schools Boilers Central Air conditioners Chillers Comprehensive Measures/Whole Building Custom/Others pending approval Energy Mgmt. Systems/Building Controls Furnaces Heat pumps Lighting Lighting Controls/Sensors Motor VFDs Motors Roofs Windows Yes AEP (Central, North and SWEPCO) - Commercial Solutions Program (Texas) Utility Rebate Program Texas Commercial Industrial Institutional Local Government Nonprofit Schools State Government

137

LIGHTNING PROTECTION OF ROOF-MOUNTED SOLAR ...  

Science Conference Proceedings (OSTI)

Page 1. LIGHTNING PROTECTION OF ROOF-MOUNTED SOLAR CELLS ... Working paper developed for a NASA-sponsored study of solar cells ...

2013-05-17T23:59:59.000Z

138

Lightweight, self-ballasting photovoltaic roofing assembly  

DOE Patents (OSTI)

A photovoltaic roofing assembly comprises a roofing membrane (102), a plurality of photovoltaic modules (104, 106, 108) disposed as a layer on top of the roofing membrane (102), and a plurality of pre-formed spacers, pedestals or supports (112, 114, 116, 118, 120, 122) which are respectively disposed below the plurality of photovoltaic modules (104, 106, 108) and integral therewith, or fixed thereto. Spacers (112, 114, 116, 118, 120, 122) are disposed on top of roofing membrane (102). Membrane (102) is supported on conventional roof framing, and attached thereto by conventional methods. In an alternative embodiment, the roofing assembly may have insulation block (322) below the spacers (314, 314', 315, 315'). The geometry of the preformed spacers (112, 114, 116, 118, 120, 122, 314, 314', 315, 315') is such that wind tunnel testing has shown its maximum effectiveness in reducing net forces of wind uplift on the overall assembly. Such construction results in a simple, lightweight, self-ballasting, readily assembled roofing assembly which resists the forces of wind uplift using no roofing penetrations.

Dinwoodie, T.L.

1998-05-05T23:59:59.000Z

139

Lightweight, self-ballasting photovoltaic roofing assembly  

DOE Patents (OSTI)

A photovoltaic roofing assembly comprises a roofing membrane (102), a plurality of photovoltaic modules (104, 106, 108) disposed as a layer on top of the roofing membrane (102), and a plurality of pre-formed spacers, pedestals or supports (112, 114, 116, 118, 120, 122) which are respectively disposed below the plurality of photovoltaic modules (104, 106, 108) and integral therewith, or fixed thereto. Spacers (112, 114, 116, 118, 120, 122) are disposed on top of roofing membrane (102). Membrane (102) is supported on conventional roof framing, and attached thereto by conventional methods. In an alternative embodiment, the roofing assembly may have insulation block (322) below the spacers (314, 314', 315, 315'). The geometry of the preformed spacers (112, 114, 116, 118, 120, 122, 314, 314', 315, 315') is such that wind tunnel testing has shown its maximum effectiveness in reducing net forces of wind uplift on the overall assembly. Such construction results in a simple, lightweight, self-ballasting, readily assembled roofing assembly which resists the forces of wind uplift using no roofing penetrations.

Dinwoodie, Thomas L. (Berkeley, CA)

1998-01-01T23:59:59.000Z

140

Aging of reflective roofs: soot deposition  

Science Conference Proceedings (OSTI)

Solar-reflective roofs remain cooler than absorptive roofs and thus conserve electricity otherwise needed for air conditioning. A currently controversial aspect of solar-reflective cool roofing is the extent to which an initially high solar reflectance decreases with time. We present experimental data on the spectral absorption of deposits that accumulate on roofs, and we attribute most of the absorption to carbon soot originally produced by combustion. The deposits absorb more at short wavelengths (e.g., in the blue) than in the red and infrared, imparting a slightly yellow tinge to formerly white surfaces. The initial rate of reflectance reduction by soot accumulation is consistent with known emission rates that are due to combustion. The long-term reflectance change appears to be determined by the ability of the soot to adhere to the roof, resisting washout by rain.

Berdahl, Paul; Akbari, Hashem; Rose, Leanna S.

2001-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Evolution of cool roof standards in the United States  

NLE Websites -- All DOE Office Websites (Extended Search)

& Standards, Heat Island Abstract Roofs that have high solar reflectance and high thermal emittance stay cool in the sun. A roof with lower thermal emittance but exceptionally...

142

Accelerated Aging of Roofing Surfaces | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Accelerated Aging of Roofing Surfaces Accelerated Aging of Roofing Surfaces Emerging Technologies Project for the 2013 Building Technologies Office's Program Peer Review...

143

Potential benefits of cool roofs on commercial buildings: conserving...  

NLE Websites -- All DOE Office Websites (Extended Search)

of cool roofs on commercial buildings: conserving energy, saving money, and reducing emission of greenhouse gases and air pollutants Title Potential benefits of cool roofs on...

144

Terracotta and Cement Roofs Vulnerable in Wildfires, NIST ...  

Science Conference Proceedings (OSTI)

... that the embersor firebrandsinfiltrated gaps between certain types of roofing tiles and ... Of the four roof styles studied, the flat tile terracotta ...

2013-05-14T23:59:59.000Z

145

Application of Spray Foam Insulation Under Plywood and OSB Roof...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Insulation Under Plywood and OSB Roof Sheathing (Fact Sheet) Application of Spray Foam Insulation Under Plywood and OSB Roof Sheathing (Fact Sheet), Building America Case Study:...

146

Building Energy Software Tools Directory: Cool Roof Calculator  

NLE Websites -- All DOE Office Websites (Extended Search)

Cool Roof Calculator Cool Roof Calculator Cool Roof Calculator logo. Many reflective roof coatings and membranes are now available for low-slope roofs. These coatings help to reduce summer air-conditioning loads, but can also increase the winter heating load. The Cool Roof Calculator will estimate both how much energy you'll save in the summer and how much extra energy you'll need in the winter. Cool Roof Calculator provides answers on a 'per square foot' basis, so you can then multiply by the area of your roof to find out your net savings each year. Keywords reflective roof, roofing membrane, low-slope roof Validation/Testing The Radiation Control Fact Sheet describes both the analytical and experimental results that went into the calculator's development. Expertise Required

147

New and Underutilized Technology: Green Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Green Roofs Green Roofs New and Underutilized Technology: Green Roofs October 8, 2013 - 2:53pm Addthis The following information outlines key deployment considerations for green roofs within the Federal sector. Benefits Green roofs place vegetation on the rooftop to reduce heat load and add insulation. It also reduces storm runoff from the roof. Application Green roofs are appropriate for deployment within most building categories with higher roof to conditioned floor area ratios and should be considered in building design, renovation, or during roof replacement projects. Climate and Regional Considerations Climate issues can affect the performance of green roofs. Key Factors for Deployment Green roofs have weight loading issues, which need to be considered prior to deployment.

148

what is a cool roof? what is the  

E-Print Network (OSTI)

samples the 2008 building energy efficiency standards for cool roofs: There are two approaches Building Energy Efficiency Standards California contact more about cool roof requirements for more to the building below The sun's heat hits the roof surface A non-residential cool roof Coating for a low

149

Faced with rising fuel costs, building and home owners are looking for energy-efficient solutions. Improving the building envelope (roof or attic system, walls,  

E-Print Network (OSTI)

efficiency. · ORNL established test facilities to measure essential property values needed by WUFI, enabling Instationär), the model has been validated with data from natural exposure field test facilities in Germany of envelope assemblies. These facilities enable researchers to measure heat, air, and moisture penetration

Oak Ridge National Laboratory

150

Faced with rising fuel costs, building and home owners are looking for energy-efficient solutions. Improving the building envelope (roof or attic system, walls,  

E-Print Network (OSTI)

-durable products to increase energy efficiency. · ORNL established test facilities to measure essential property Instationär), the model has been validated with data from natural exposure field test facilities in Germany of envelope assemblies. These facilities enable researchers to measure heat, air, and moisture penetration

Oak Ridge National Laboratory

151

Million Solar Roofs: Partners Make Markets  

DOE Green Energy (OSTI)

Million Solar Roofs (MSR) Partners Make Markets Executive Summary is a summary of the MSR Annual Partnership Update, a report from all the partners and partnerships who participate in the MSR Initiative.

Not Available

2004-06-01T23:59:59.000Z

152

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Energy 101: Wind Turbines Energy 101: Solar PV Sec. Chu Online Town Hall Energy 101: Geothermal Heat Pumps Why Cool Roofs? Chu at COP-16: Building a Sustainable Energy Future...

153

Why Cool Roofs? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Energy 101: Wind Turbines Energy 101: Solar PV Sec. Chu Online Town Hall Energy 101: Cool Roofs Energy 101: Geothermal Heat Pumps Chu at COP-16: Building a Sustainable Energy...

154

A transient heat and mass transfer model of residential attics used to simulate radiant barrier retrofits. Part 2: Validation and simulations  

Science Conference Proceedings (OSTI)

A computer program was developed and used to implement the model described on Part 1 of this paper. The program used an iterative process to predict temperatures and heat fluxes using linear algebra principles. The results from the program were compared to experimental data collected during a three-year period. The model simulated different conditions such as variations in attic ventilation, variations in attic ceiling insulation, and different radiant barrier orientations for summer and winter seasons. It was observed that the model predicted with an error of less than 10% for most cases. This paper presents model results for nonradiant barrier cases as well as cases for radiant barriers installed horizontally on top of the attic floor (HRB) and for radiant barriers stapled to the attic rafters (TRB). Savings produced by radiant barriers and sensitivity analyses are also presented. The model results supported the experimental trend that emissivity was the single most significant parameter that affected the performance of radiant barriers.

Medina, M.A. [Texas A and M Univ., Kingsville, TX (United States). Dept. of Mechanical and Industrial Engineering

1998-02-01T23:59:59.000Z

155

Energy Performance Aspects of a Florida Green Roof Part 2  

E-Print Network (OSTI)

Green roof installation in the United States is growing at a significant rate. There are a number of reasons for this growth including rainwater runoff reduction and aesthetic benefits. Energy performance evaluations of green roofs, the subject of this study, are also becoming available. This monitored study is an evaluation of summer and winter energy performance aspects of a green roof on a 2-story central Florida university building addition that was completed in 2005. An earlier report on this study was published through the 2006 Symposium on Improving Building Systems in Hot and Humid Climates. This report reviews these earlier results and provides second-summer results which show significant performance improvements for the green roof compared with the first summer results. One half of the two-story project buildings 3,300 square foot project roof is a light-colored, conventional flat membrane roof, the other half being the same membrane roof covered with 6 to 8 of plant media and a variety of primarily native Florida vegetation up to approximately 2 feet in height to create an extensive green roof. Analysis of 2005 summer data from the first year the green roof was installed indicates significantly lower peak roof surface temperatures for the green roof compared with the conventional roof and a significant shift in when the peak green roof temperature occurs compared to the conventional roof. Data analysis of the same 2005 period also shows lower heat fluxes for the green roof. Calculations show the green roof to have an average heat flux of 0.39 Btu/ft2hr or 18.3% less than the conventional roofs average heat fluxrate of 0.48 Btu/ft2hr. Analysis of 2006 summer data when the green roof was more established and conventional roof somewhat darker, shows even greater temperature and heat flux differences between the two roofs. The weighted average heat flux rate over the 2006 summer period for the green roof is 0.34 Btu/ft2hr or 44.1% less than the conventional roofs average heat flux rate of 0.60 Btu/ft2hr. An additional heat flux analysis was performed for an April 1st 2006 through October 31st 2006 monitoring period to provide an estimate of heat flux for an extended cooling season. The weighted average heat flux rate over the period for the green roof is 0.25 Btu/ft2hr or 45.7% less than the conventional roofs average heat flux rate of 0.46 Btu/ft2hr. Winter data again show substantially lower peak roof surface temperatures, higher nighttime surface temperatures and significantly lower heat flux rates for the green roof compared with the conventional roof. For periods during which the ambient air temperature was less than 55oF, the weighted average winter heat flux rate for the green roof is -0.40 Btu/ft2hr or 49.5% less than the conventional roofs average heat flux rate of -0.79 Btu/ft2hr. Because of air conditioning zoning limitations, an extensive energy savings analysis was not possible for this project. However, an energy savings analysis was performed using the roof heat flux results and equipment efficiency assumptions. Based on this analysis the total estimated cooling and heating season savings for the green roof compared with the conventional roof, if the entire 3,300 square foot project roof were green, would be approximately 489 kWhr/yr.

Sonne, J.; Parker, D.

2008-12-01T23:59:59.000Z

156

Development of a Transient Heat and Mass Transfer Model of Residential Attics to Predict Energy Savings Produced by the Use of Radiant Barriers  

E-Print Network (OSTI)

A transient heat and mass transfer model was developed to predict ceiling heat gain/loss through the attic space in residences and to accurately estimate savings in cooling and heating loads produced by the use of radiant barriers. The model accounted for transient conduction, convection and radiation and incorporated moisture and air transport across the attic. Environmental variables such as solar loads on outer attic surfaces and sky temperatures were also estimated. The model was driven by hourly weather data which included: time, outdoor air temperature, horizontal sun and sky radiation, wind speed and direction, relative humidity (dew point), and cloud cover data. The outputs of the model were ceiling heat fluxes, inner and outer heat fluxes from all surfaces, inner and outer surface temperatures and attic air temperatures. Transient conduction was modeled using response factors. Response factors were calculated for each attic component based on construction type. Convective heat transfer was modeled using flat plate correlations found in the literature and radiative heat transfer was modeled using radiation enclosure theory. Moisture was incorporated via a condensation/evaporation model. A new procedure was developed to account for attic air stratification. Both forced and natural attic ventilation patterns were added to the model for three types of louver combination arrangements. An iterative technique was used to solve a set of simultaneous heat balance equations. The model predictions were compared to experimental data gathered throughout a three year experimental effort of side-by-side testing of attics retrofit with radiant barriers. The model was compared to the experimental data for a variety of situations which included: different attic insulation levels, various attic airflow rates, cooling and heating seasons, and different radiant barrier orientations. The model predicted ceiling heat flows within 10% for most cases. The model was used to run simulations and parametric studies under a diversity of climates, insulation levels and attic airflow patterns. Model predictions and results were presented on the basis of savings produced by the use of radiant barriers. Hourly, daily, and seasonal predictions by the model were in excellent agreement with observed experimental data and with literature.

Medina, M. A.

1992-12-01T23:59:59.000Z

157

Energy Department Completes Cool Roof Installation on DC Headquarters  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Completes Cool Roof Installation on DC Completes Cool Roof Installation on DC Headquarters Building to Save Money by Saving Energy Energy Department Completes Cool Roof Installation on DC Headquarters Building to Save Money by Saving Energy December 14, 2010 - 12:00am Addthis Washington - Secretary Steven Chu today announced the completion of a new cool roof installation on the Department of Energy's Headquarters West Building. There was no incremental cost to adding the cool roof as part of the roof replacement project and it will save taxpayers $2,000 every year in building energy costs. Cool roofs use lighter-colored roofing surfaces or special coatings to reflect more of the sun's heat, helping improve building efficiency, reduce cooling costs and offset carbon emissions. The cool roof and increased insulation at the facility were

158

Low-slope roofing research needs: An ORNL draft assessment  

Science Conference Proceedings (OSTI)

The Low-Slope Roofing Research Needs Agenda is a resource document prepared by the Roofing Industry Research Advisory Panel. The document will aid the Panel in developing recommended research priorities and schedules for the Roof Research Center established by the US Department of Energy at Oak Ridge National Laboratory (ORNL). The Roof Research Center provides the roofing industry with a unique test facility capable of careful, on-line measurements on whole roof systems under controlled, simulated in-service conditions. This type of systems testing, however, is not well-developed in the roofing industry where, customarily, careful measurements are not only made to assess individual material properties under design conditions and systems testing generally is limited to ''performance testing''; that is, exposing roof systems to typical or accelerated environments and observing or measuring the time intergrated effects on various components. This document discusses the capabilities of the center and roofing research issues.

Busching, H.W.; Courville, G.E.; Dvorchak, M.; McCorkle, J.

1987-08-01T23:59:59.000Z

159

Weathering of Roofing Materials-An Overview  

Science Conference Proceedings (OSTI)

An overview of several aspects of the weathering of roofing materials is presented. Degradation of materials initiated by ultraviolet radiation is discussed for plastics used in roofing, as well as wood and asphalt. Elevated temperatures accelerate many deleterious chemical reactions and hasten diffusion of material components. Effects of moisture include decay of wood, acceleration of corrosion of metals, staining of clay, and freeze-thaw damage. Soiling of roofing materials causes objectionable stains and reduces the solar reflectance of reflective materials. (Soiling of non-reflective materials can also increase solar reflectance.) Soiling can be attributed to biological growth (e.g., cyanobacteria, fungi, algae), deposits of organic and mineral particles, and to the accumulation of flyash, hydrocarbons and soot from combustion.

Berdahl, Paul; Akbari, Hashem; Levinson, Ronnen; Miller, William A.

2006-03-30T23:59:59.000Z

160

Performance of powder-filled evacuated panel insulation in a manufactured home roof cavity: Tests in the Large Scale Climate Simulator  

SciTech Connect

A full-scale section of half the top of a single-wide manufactured home has been studied in the Large Scale Climate Simulator (LSCS) at the Oak Ridge National Laboratory. A small roof cavity with little room for insulation at the eaves is often the case with single-wide units and limits practical ways to improve thermal performance. The purpose of the current tests was to obtain steady-state performance data for the roof cavity of the manufactured home test section when the roof cavity was insulated with fiberglass batts, blown-in rock wool insulation or combinations of these insulations and powder-filled evacuated panel (PEP) insulation. Four insulation configurations were tested: (A) a configuration with two layers of nominal R{sub US}-7 h {center_dot} ft{sup 2} {center_dot} F/BTU (R{sub SI}-1.2 m{sup 2} {center_dot} K/W) fiberglass batts; (B) a layer of PEPs and one layer of the fiberglass batts; (C) four layers of the fiberglass batts; and (D) an average 4.1 in. (10.4 cm) thick layer of blown-in rock wool at an average density of 2.4 lb/ft{sup 3} (38 kg/m{sup 3}). Effects of additional sheathing were determined for Configurations B and C. With Configuration D over the ceiling, two layers of expanded polystyrene (EPS) boards, each about the same thickness as the PEPs, were installed over the trusses instead of the roof. Aluminum foils facing the attic and over the top layer of EPS were added. The top layer of EPS was then replaced by PEPs.

Petrie, T.W.; Kosny, J.; Childs, P.W.

1996-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Pollution Impact on Cool Roof Efficacy Research Project | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Emerging Technologies » Pollution Impact on Cool Roof Efficacy Emerging Technologies » Pollution Impact on Cool Roof Efficacy Research Project Pollution Impact on Cool Roof Efficacy Research Project The Department of Energy (DOE) is currently determining how pollution impacts the efficacy of cool roofs. The project specifically is focusing on the efficacy of white roofs in Northern India. The first phase of the project will take physical measurements to characterize the cooling and climate effects of white roofs. Results from this project will provide important guidance to policymakers and planners as they decide where cool roofs would have the greatest benefits. Project Description The project involves the development of advanced surfaces and next-generation materials to improve solar reflectance of roofs; the ability to reflect the visible, infrared and ultraviolet wavelengths of the

162

Cool Roofs Lead to Cooler Cities | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cool Roofs Lead to Cooler Cities Cool Roofs Lead to Cooler Cities Cool Roofs Lead to Cooler Cities July 23, 2010 - 2:07pm Addthis John Schueler John Schueler Former New Media Specialist, Office of Public Affairs How does it work? Dark-colored roofs and roadways create what is called the "urban heat island effect," meaning a city is significantly warmer than its surrounding rural areas. Light colored roofs reduce the heat island effect and improve air quality by reducing emissions. Lighter-colored roofing surfaces reflect more of the sun's heat, which helps to improve building efficiency by reducing cooling costs and offsetting carbon emissions. Roofs and road pavement cover 50 to 65 percent of urban areas. Because they absorb so much heat, dark-colored roofs and roadways create what is called

163

Cool Roofs: An Easy Upgrade | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Cool Roofs: An Easy Upgrade Cool Roofs: An Easy Upgrade Cool Roofs: An Easy Upgrade December 14, 2010 - 9:25am Addthis Cathy Zoi Former Assistant Secretary, Office of Energy Efficiency & Renewable Energy What does this mean for me? Dark roofs can be 50 degrees hotter than light roofs. Combined with dark roads and parking lots, dark roofs lead to the 'urban heat island' effect: cities tend to be 2-5 degrees hotter. A cooler roof means energy bills that are up to 10-15% lower because your air conditioner doesn't have to work as hard. Check out Google Earth - the 'view from above' of your favorite American city. And look at the roofs of the office buildings, warehouses, shopping centers, and even the homes. Most of them are probably pretty dark in color - and this means they heat up a lot when the weather is warm -

164

SunShot Initiative: Innovative Ballasted Flat Roof Solar Photovoltaic  

NLE Websites -- All DOE Office Websites (Extended Search)

Innovative Ballasted Flat Roof Innovative Ballasted Flat Roof Solar Photovoltaic Racking System to someone by E-mail Share SunShot Initiative: Innovative Ballasted Flat Roof Solar Photovoltaic Racking System on Facebook Tweet about SunShot Initiative: Innovative Ballasted Flat Roof Solar Photovoltaic Racking System on Twitter Bookmark SunShot Initiative: Innovative Ballasted Flat Roof Solar Photovoltaic Racking System on Google Bookmark SunShot Initiative: Innovative Ballasted Flat Roof Solar Photovoltaic Racking System on Delicious Rank SunShot Initiative: Innovative Ballasted Flat Roof Solar Photovoltaic Racking System on Digg Find More places to share SunShot Initiative: Innovative Ballasted Flat Roof Solar Photovoltaic Racking System on AddThis.com... Concentrating Solar Power Photovoltaics

165

Cool Colored Roofs to Save Energy and Improve Air Quality  

E-Print Network (OSTI)

Konopacki. 1998b. "Measured Energy Savings of Light- coloredPeak Power and Cooling Energy Savings of High-Albedo Roofs,Peak Power and Cooling Energy Savings of High-albedo Roofs,"

Akbari, Hashem; Levinson, Ronnen; Miller, William; Berdahl, Paul

2005-01-01T23:59:59.000Z

166

Status of cool roof standards in the United States  

E-Print Network (OSTI)

Cool roofs save energy. ASHRAE Transactions 104(1B):783-788.2000. Updates on revision to ASHRAE Standard 90.2: includingSSP90.1 for Reflective Roofs. ASHRAE Transactions, 104(1B),

Akbari, Hashem; Levinson, Ronnen

2008-01-01T23:59:59.000Z

167

Evolution of cool-roof standards in the United States  

E-Print Network (OSTI)

SSP90.1 for Reflective Roofs. ASHRAE Transactions, 104(1B),Roofing Insulation and Siding. Mar/Apr, pp. 52-58. ASHRAE.1999. ASHRAE Standard 90.1-1999: Energy Standard for

Akbari, Hashem

2008-01-01T23:59:59.000Z

168

Energy Saving 'Cool Roofs' Installed at Y-12 | National Nuclear...  

National Nuclear Security Administration (NNSA)

Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > NNSA Blog > Energy Saving 'Cool Roofs' Installed at Y-12 Energy Saving 'Cool Roofs' Installed at Y-12...

169

(DDBS) System Doubles Pot Suction, Reduces Roof Emission  

Science Conference Proceedings (OSTI)

... Suction (DDBS) System Doubles Pot Suction, Reduces Roof Emission .... Phase Change Materials in Thermal Energy Storage for Concentrating Solar Power...

170

Cool Roof Resource Guide for Federal Agencies (Fact Sheet)  

Science Conference Proceedings (OSTI)

Resource guide containing information and links for the evaluation and installation of cool roofs within the Federal Government

Not Available

2009-07-01T23:59:59.000Z

171

Monitoring the Energy-Use Effects of Cool Roofs on California Commercial Buildings  

E-Print Network (OSTI)

model the complete heat transfer process through the roof,model the complete heat transfer process through the roof,

Akbari, Hashem; Levinson, Ronnen; Konopaki, Steve; Rainer, Leo

2004-01-01T23:59:59.000Z

172

Boots on the Roof | Open Energy Information  

Open Energy Info (EERE)

Boots on the Roof Boots on the Roof Jump to: navigation, search Logo: Boots on the Roof Name Boots on the Roof Address 4670 Automall Parkway Place Fremont, California Zip 94538 Region Bay Area Number of employees 51-200 Year founded 1992 Phone number 888.893.0367 Website http://www.bootsontheroof.com/ Coordinates 37.498922°, -121.963028° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":37.498922,"lon":-121.963028,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

173

Update on the Million Solar Roofs Initiative  

DOE Green Energy (OSTI)

The Million Solar Roofs Initiative, announced by the President in June of 1997, spans a period of twelve years and intends to increase domestic deployment of solar technologies. This paper presents an overview of the development of the initiative and significant activities to date.

Herig, C.

1999-05-09T23:59:59.000Z

174

Solar heater and roof attachment means  

Science Conference Proceedings (OSTI)

A solar heater includes an elongated solar collector having two fixedly connected solar panels of highly heat conductive material supported by a roof clamp on a shingled roof. The bottom edges of each of the solar panels include upturned gutter portions. One form of roof clamp for shingled roofs includes a J-shape shingle clamp member having a clamp bolt extending therethrough, and a solar collector clamp member assembled on the bolt and clamped to the bottom gutter portions of the solar panels. A bottom plate of the J-shape clamp member is slid under a shingle of a first shingle course and under a shingle of a second upper shingle course to carry the bolt into the top of the gap between adjacent shingle portions of the first course and to position a top plate of the shingle clamp member over parts of the shank portions of the first course and over a part of the one shingle of the second course. A clamp nut clamps the collector clamp member and the shingle clamp member firmly to the contacted shingles.

Howe, G.L.; Koutavas, S.G.

1984-02-21T23:59:59.000Z

175

Covered Product Category: Cool Roof Products  

Energy.gov (U.S. Department of Energy (DOE))

FEMP provides acquisition guidance across a variety of product categories, including cool roof products, which are an ENERGY STAR-qualified product category. Federal laws and executive orders mandate that agencies meet these efficiency requirements in all procurement and acquisition actions that are not specifically exempted by law.

176

Cool Roof Calculator | Open Energy Information  

Open Energy Info (EERE)

Cool Roof Calculator Cool Roof Calculator Jump to: navigation, search Tool Summary Name: Cool Roof Calculator Agency/Company /Organization: Oak Ridge National Laboratory Sector: Energy Focus Area: Buildings, Energy Efficiency Resource Type: Online calculator, Software/modeling tools User Interface: Website Website: www.ornl.gov/sci/roofs+walls/facts/CoolCalcEnergy.htm Country: United States Cost: Free Northern America Coordinates: 37.09024°, -95.712891° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":37.09024,"lon":-95.712891,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

177

Evolution of cool-roof standards in the United States  

SciTech Connect

Roofs that have high solar reflectance and high thermal emittance stay cool in the sun. A roof with lower thermal emittance but exceptionally high solar reflectance can also stay cool in the sun. Substituting a cool roof for a noncool roof decreases cooling-electricity use, cooling-power demand, and cooling-equipment capacity requirements, while slightly increasing heating-energy consumption. Cool roofs can also lower citywide ambient air temperature in summer, slowing ozone formation and increasing human comfort. Provisions for cool roofs in energy-efficiency standards can promote the building- and climate-appropriate use of cool roofing technologies. Cool-roof requirements are designed to reduce building energy use, while energy-neutral cool-roof credits permit the use of less energy-efficient components (e.g., larger windows) in a building that has energy-saving cool roofs. Both types of measures can reduce the life-cycle cost of a building (initial cost plus lifetime energy cost). Since 1999, several widely used building energy-efficiency standards, including ASHRAE 90.1, ASHRAE 90.2, the International Energy Conservation Code, and California's Title 24 have adopted cool-roof credits or requirements. This paper reviews the technical development of cool-roof provisions in the ASHRAE 90.1, ASHRAE 90.2, and California Title 24 standards, and discusses the treatment of cool roofs in other standards and energy-efficiency programs. The techniques used to develop the ASHRAE and Title 24 cool-roof provisions can be used as models to address cool roofs in building energy-efficiency standards worldwide.

Akbari, Hashem; Akbari, Hashem; Levinson, Ronnen

2008-07-11T23:59:59.000Z

178

Heating energy measurements of single-family houses with attics containing radiant barriers in combustion with R-11 and R-30 ceiling insulation  

Science Conference Proceedings (OSTI)

Tests were conducted by Oak Ridge National Laboratory to determine the heating energy performance of two levels of fiberglass-batt attic insulation (R-11 and R-30) in combination with truss and horizontally installed radiant barriers. The tests, a continuation of work started in the summer of 1985, were conducted in three unoccupied ranch-style houses in Karns, Tennessee, during the winter of 1986-87. The measured results of the heating tests showed that a horizontal radiant barrier used with R-11 attic insulation reduced the house heating load by 9.3% compared with R-11 with no radiant barrier, while a truss barrier showed essentially no change in the heating load. Horizontal and truss barriers each reduced the heating load by 3.5% when added to R-30 attic insulation. Moisture condensed on the bottom of the horizontal barrier during cold early morning weather but usually dissipated in the warmer afternoon hours at Karns and left no accumulation in the insulation. Depending on the level of attic insulation, an annual heating and cooling HVAC savings ranging from $5 to $65 is estimated to be attainable when a radiant barrier is installed in the attic at Karns. 8 refs., 64 figs., 18 tabs.

Levins, W.P.; Karnitz, M.A.

1988-08-01T23:59:59.000Z

179

Bio-based Thermochromic Intelligent Roof Coating Research Project |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

based Thermochromic Intelligent Roof based Thermochromic Intelligent Roof Coating Research Project Bio-based Thermochromic Intelligent Roof Coating Research Project The Department of Energy is conducting research into bio-based thermochromic intelligent roof coatings. The coatings are developed from waste cooking oil. Project Description This project seeks to develop and demonstrate a waste cooking oil-based thermochromic smart roof coating technology that will adjust light transmission in response to temperature changes. This will reduce energy demands for temperature regulation. The project will also study the effects of different oil sources on coating properties. Project Partners This project is being undertaken between the Department of Energy and United Environment & Energy. Project Goals

180

Status of cool roof standards in the United States  

SciTech Connect

Since 1999, several widely used building energy efficiency standards, including ASHRAE 90.1, ASHRAE 90.2, the International Energy Conservation Code, and California's Title 24 have adopted cool roof credits or requirements. We review the technical development of cool roof provisions in the ASHRAE 90.1, ASHRAE 90.2, and California Title 24 standards, and discuss the treatment of cool roofs in other standards and energy-efficiency programs. The techniques used to develop the ASHRAE and Title 24 cool roof provisions can be used as models to address cool roofs in building energy standards worldwide.

Akbari, Hashem; Levinson, Ronnen

2007-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Would You Consider Installing a Cool Roof? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Would You Consider Installing a Cool Roof? Would You Consider Installing a Cool Roof? Would You Consider Installing a Cool Roof? August 12, 2010 - 7:30am Addthis On Monday, Erin discussed cool roof technologies and how they can improve the comfort of buildings while reducing energy costs. Would you consider installing a cool roof? Why or why not? Each Thursday, you have the chance to share your thoughts on a question about energy efficiency or renewable energy for consumers. Please comment with your answers, and also feel free to respond to other comments. E-mail your responses to the Energy Saver team at consumer.webmaster@nrel.gov. Addthis Related Articles Would You Consider Driving a Vehicle that Can Run on Biodiesel? Would You Consider Installing a Cool Roof? Tips: Energy-Efficient Roofs How Do You Save Water When Caring for Your Lawn?

182

Composite synthetic roofing structure with integral solar collector  

Science Conference Proceedings (OSTI)

A form-molded synthetic foam roofing section or structure is described, having a solar-collecting insert or panel incorporated therein with a relatively broad undersurface and an exposed surface configured to resemble interlocked and overlapping roofing shingles which are united to support a surface such as wood, metal, etc. During the molding process. The roofing structure may be affixed by any conventional means, such as nails or adhesives, to roof boards, rafters or over old existing roof structures with adjacent roofing sections interconnected by appropriate inlets and outlets for the solar panel insert. Solar heat-collecting fluid may be circulated through the solar panel inserts in a conventional manner. Connecting tubes are provided for connecting the solar panel inserts in adjacent roofing sections and terminal connectors are compatible with all circulating systems.

Gould, W.M.

1981-06-16T23:59:59.000Z

183

Building Technologies Office: Pollution Impact on Cool Roof Efficacy  

NLE Websites -- All DOE Office Websites (Extended Search)

Pollution Impact on Pollution Impact on Cool Roof Efficacy Research Project to someone by E-mail Share Building Technologies Office: Pollution Impact on Cool Roof Efficacy Research Project on Facebook Tweet about Building Technologies Office: Pollution Impact on Cool Roof Efficacy Research Project on Twitter Bookmark Building Technologies Office: Pollution Impact on Cool Roof Efficacy Research Project on Google Bookmark Building Technologies Office: Pollution Impact on Cool Roof Efficacy Research Project on Delicious Rank Building Technologies Office: Pollution Impact on Cool Roof Efficacy Research Project on Digg Find More places to share Building Technologies Office: Pollution Impact on Cool Roof Efficacy Research Project on AddThis.com... About Take Action to Save Energy Partner with DOE

184

Inverted Attic Bulkhead for HVAC Ductwork, Roseville, California (Fact Sheet), Building America Case Study: Efficient Solutions for New and Existing Homes, Building Technologies Office (BTO)  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Inverted Attic Bulkhead for Inverted Attic Bulkhead for HVAC Ductwork Roseville, California PROJECT INFORMATION Project Name: Long-Term Monitoring of Occupied Test House Location: Roseville, CA Partners: K. Hovnanian® Homes®, www.khov.com IBACOS www.ibacos.com Building Component: Envelope, structural, HVAC ducts Construction: New Application: New; single and/or multifamily Year Tested: 2012 Applicable Climate Zone(s): Hot-dry climate PERFORMANCE DATA HERS Index: 52 Projected Energy Savings: 11 million Btu/year heating and cooling savings Projected Energy Cost Savings: $116/year Modifying the truss system of a new home to accommodate ductwork within an inverted insulated bulkhead along the attic floor can save energy by placing

185

Aging and weathering of cool roofing membranes  

Science Conference Proceedings (OSTI)

Aging and weathering can reduce the solar reflectance of cool roofing materials. This paper summarizes laboratory measurements of the solar spectral reflectance of unweathered, weathered, and cleaned samples collected from single-ply roofing membranes at various sites across the United States. Fifteen samples were examined in each of the following six conditions: unweathered; weathered; weathered and brushed; weathered, brushed and then rinsed with water; weathered, brushed, rinsed with water, and then washed with soap and water; and weathered, brushed, rinsed with water, washed with soap and water, and then washed with an algaecide. Another 25 samples from 25 roofs across the United States and Canada were measured in their unweathered state, weathered, and weathered and wiped. We document reduction in reflectivity resulted from various soiling mechanisms and provide data on the effectiveness of various cleaning approaches. Results indicate that although the majority of samples after being washed with detergent could be brought to within 90% of their unweathered reflectivity, in some instances an algaecide was required to restore this level of reflectivity.

Akbari, Hashem; Berhe, Asmeret A.; Levinson, Ronnen; Graveline,Stanley; Foley, Kevin; Delgado, Ana H.; Paroli, Ralph M.

2005-08-23T23:59:59.000Z

186

DOE Cool Roof Calculator for Low-Slope or Flat Roofs  

NLE Websites -- All DOE Office Websites (Extended Search)

Cool Roof Calculator Cool Roof Calculator Estimates Cooling and Heating Savings for Flat Roofs with Non-Black Surfaces - Developed by the U.S. Department of Energy's Oak Ridge National Laboratory (Version 1.2) - This version of the calculator is for small and medium-sized facilities that purchase electricity without a demand charge based on peak monthly load. If you have a large facility that purchases electricity with a demand charge, run the CoolCalcPeak version in order to include the savings in peak demand charges from using solar radiation control. - What you get out of this calculator is only as good as what you put in. If you CLICK HERE , you'll find help in figuring out the best input values. Some things, such as the weathering of the solar radiation control properties and the effects of a plenum, are especially important. You'll

187

Hawaii Marine Base Installs Solar Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Marine Base Installs Solar Roofs Marine Base Installs Solar Roofs Hawaii Marine Base Installs Solar Roofs April 2, 2010 - 2:42pm Addthis Lorelei Laird Writer, Energy Empowers What does this project do? Marine Corps Base Hawaii replaced roofs on two buildings with polyvinyl chloride membrane 'cool' roofs and solar panels. The new roofs saves $20,000 a year in energy costs. Built on the end of the Mokapu Peninsula on Oahu's northeast coast, the Marine Corps Base Hawaii (MCBH) at Kaneohe Bay gets plenty of sunlight. But harnessing that sunlight to create renewable electricity was considered too expensive to be practical - until 2008. That's when MCBH took advantage of planned maintenance funding to help offset the high cost of installing photovoltaic panels on the base. As a military entity, MCBH can't directly take advantage of federal or state

188

Hawaii Marine Base Installs Solar Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Hawaii Marine Base Installs Solar Roofs Hawaii Marine Base Installs Solar Roofs Hawaii Marine Base Installs Solar Roofs April 2, 2010 - 2:42pm Addthis Lorelei Laird Writer, Energy Empowers What does this project do? Marine Corps Base Hawaii replaced roofs on two buildings with polyvinyl chloride membrane 'cool' roofs and solar panels. The new roofs saves $20,000 a year in energy costs. Built on the end of the Mokapu Peninsula on Oahu's northeast coast, the Marine Corps Base Hawaii (MCBH) at Kaneohe Bay gets plenty of sunlight. But harnessing that sunlight to create renewable electricity was considered too expensive to be practical - until 2008. That's when MCBH took advantage of planned maintenance funding to help offset the high cost of installing photovoltaic panels on the base. As a military entity, MCBH can't directly take advantage of federal or state

189

Cool Roofs: Your Questions Answered | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Roofs: Your Questions Answered Roofs: Your Questions Answered Cool Roofs: Your Questions Answered January 6, 2011 - 2:58pm Addthis John Schueler John Schueler Former New Media Specialist, Office of Public Affairs Last month Secretary Chu announced that the Department of Energy had installed a "cool roof" atop the west building of our Washington, DC headquarters. The announcement elicited a fair number of questions from his Facebook fans, so we decided to reach out to the people behind the project for their insight on the specific benefits of switching to a cool roof, and the process that went into making that choice. Jim Bullis (Facebook): So what is the percentage saving of energy bills for this building? Answer: The West Building cool roof is estimated to save about $2,000 per

190

Cool Roofs and Heat Islands | Open Energy Information  

Open Energy Info (EERE)

Cool Roofs and Heat Islands Cool Roofs and Heat Islands Jump to: navigation, search Tool Summary Name: Cool Roofs Agency/Company /Organization: Lawrence Berkeley National Laboratory Sector: Energy Focus Area: Energy Efficiency Topics: Resource assessment Website: eetd.lbl.gov/r-bldgsee-crhi.html References: [1] Logo: Cool Roofs "On warm summer days, a city can be 6 to 8°F warmer than its surrounding areas. This effect is called the urban heat island. Cool roof materials, pavements, and vegetation can reduce the heat island effect, save energy and reduce smog formation. The goal of this research is to develop cool materials to save energy and money." [1] The Cool Roof Calculator developed at the Oak Ridge National Laboratory is a useful tool for exploring the benefits of cool materials.

191

Using Cool Roofs to Reduce Energy Use, Greenhouse Gas Emissions...  

NLE Websites -- All DOE Office Websites (Extended Search)

roofs on commercial buildings in the Metropolitan Hyderabad region, corresponding to cooling energy savings of 10 19%. With the assumption of an annual increase...

192

Cool roofs as an energy conservation measure for federal buildings  

SciTech Connect

We have developed initial estimates of the potential benefits of cool roofs on federal buildings and facilities (building scale) as well as extrapolated the results to all national facilities under the administration of the Federal Energy Management Program (FEMP). In addition, a spreadsheet ''calculator'' is devised to help FEMP estimate potential energy and cost savings of cool roof projects. Based on calculations for an average insulation level of R-11 for roofs, it is estimated that nationwide annual savings in energy costs will amount to $16M and $32M for two scenarios of increased roof albedo (moderate and high increases), respectively. These savings, corresponding to about 3.8 percent and 7.5 percent of the base energy costs for FEMP facilities, include the increased heating energy use (penalties) in winter. To keep the cost of conserved energy (CCE) under $0.08 kWh-1 as a nationwide average, the calculations suggest that the incremental cost for cool roofs should not exceed $0.06 ft-2, assuming that cool roofs have the same life span as their non-cool counterparts. However, cool roofs usually have extended life spans, e.g., 15-30 years versus 10 years for conventional roofs, and if the costs of re-roofing are also factored in, the cutoff incremental cost to keep CCE under $0.08 kWh-1 can be much higher. In between these two ends, there is of course a range of various combinations and options.

Taha, Haider; Akbari, Hashem

2003-04-07T23:59:59.000Z

193

Energy Saving 'Cool Roofs' Installed at Y-12 | National Nuclear...  

NLE Websites -- All DOE Office Websites (Extended Search)

Energy Saving 'Cool Roofs' Installed at Y-12 | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy...

194

Thermal Properties of Green Roofs in Cold Climates.  

E-Print Network (OSTI)

??Green roofs have, in the past 15 years or so, gained increasing acceptance as a means of replacing or offsetting the lost of green space (more)

Lanham, Johnnel Kiera

2007-01-01T23:59:59.000Z

195

Solar energy collector and associated methods adapted for use with overlapped roof shingles on the roof of a building  

Science Conference Proceedings (OSTI)

A method and apparatus are disclosed for collecting solar energy adapted for use with overlapped roof shingles on the roof or side of a building comprising thin flexible metal plates interposed between the overlapped shingles in heat transfer relation therewith such that heat absorbed by the shingles is transferred to the metal plates. The plates extend through the roof via slots provided therein and are affixed in heat transfer relation with pipes containing a fluid.

Nevins, R.L.

1980-04-15T23:59:59.000Z

196

Cool roof Q+A 011.doc 29 July 2009 Cool Roof Q & A (draft)  

E-Print Network (OSTI)

thermal radiation. Thus, a cool roof should have both high "solar reflectance" (ability to reflect, also measured on a scale of 0 to 1). The solar reflectance and thermal emittance of a surface are called its "radiative" properties because they describe its abilities to reflect solar radiation and emit

197

High Efficiency Solar Integrated Roof Membrane Product  

SciTech Connect

This project was designed to address the Solar Energy Technology Program objective, to develop new methods to integrate photovoltaic (PV) cells or modules within a building-integrated photovoltaic (BIPV) application that will result in lower installed cost as well as higher efficiencies of the encapsulated/embedded PV module. The technology assessment and development focused on the evaluation and identification of manufacturing technologies and equipment capable of producing such low-cost, high-efficiency, flexible BIPV solar cells on single-ply roofing membranes.

Partyka, Eric; Shenoy, Anil

2013-05-15T23:59:59.000Z

198

Improving Our Environment One Roof at a Time | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Improving Our Environment One Roof at a Time Improving Our Environment One Roof at a Time Improving Our Environment One Roof at a Time June 27, 2013 - 12:10pm Addthis Improving Our Environment One Roof at a Time How does it work? Green roofs are ideal for urban buildings with flat or shallow-pit roofs, and can include anything from basic plant cover to a garden. The primary reasons for using this type of roof include managing storm water and enjoying a rooftop open space. Green roofs also provide insulation, lower the need for heating and cooling, and can reduce the urban heat island effect. This roof type can be much more expensive to implement than other efficient roof options, so you should carefully assess your property and consult a professional before deciding to install a green roof. Click here for more information on energy-efficient roofs

199

Improving Our Environment One Roof at a Time | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Improving Our Environment One Roof at a Time Improving Our Environment One Roof at a Time Improving Our Environment One Roof at a Time June 27, 2013 - 12:10pm Addthis Improving Our Environment One Roof at a Time How does it work? Green roofs are ideal for urban buildings with flat or shallow-pit roofs, and can include anything from basic plant cover to a garden. The primary reasons for using this type of roof include managing storm water and enjoying a rooftop open space. Green roofs also provide insulation, lower the need for heating and cooling, and can reduce the urban heat island effect. This roof type can be much more expensive to implement than other efficient roof options, so you should carefully assess your property and consult a professional before deciding to install a green roof. Click here for more information on energy-efficient roofs

200

Estimating Heat and Mass Transfer Processes in Green Roof Systems: Current Modeling Capabilities and Limitations (Presentation)  

Science Conference Proceedings (OSTI)

This presentation discusses estimating heat and mass transfer processes in green roof systems: current modeling capabilities and limitations. Green roofs are 'specialized roofing systems that support vegetation growth on rooftops.'

Tabares Velasco, P. C.

2011-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Sensitivity of forced air distribution system efficiency to climate, duct location, air leakage and insulation  

E-Print Network (OSTI)

locations: Attic Attic with a radiant barrier (ductsbelow radiant barrier) Uninsulated Crawlspace vented) with cool roof/radiant barrier temperature reduction

Walker, Iain

2001-01-01T23:59:59.000Z

202

Cool Roofs Are Ready to Save Energy, Cool Urban Heat Islands, and Help Slow Global Warming  

NLE Websites -- All DOE Office Websites (Extended Search)

roofing is the fastest growing sector roofing is the fastest growing sector of the building industry, as building owners and facility managers realize the immediate and long-term benefits of roofs that stay cool in the sun. Studies exploring the energy efficiency, cost-effectiveness, and sustainability of cool roofs show that in warm or hot climates, substituting a cool roof for a conventional roof can: * Reduce by up to 15% the annual air-

203

Million Solar Roofs: Become One In A Million  

SciTech Connect

Since its announcement in June 1997, the Million Solar Roofs Initiative has generated a major buzz in communities, states, and throughout the nation. With more than 300,000 installations, the buzz is getting louder. This brochure describes Million Solar Roofs activities and partnerships.

2003-11-01T23:59:59.000Z

204

Oklahoma Tribe to Install Solar Roof | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Oklahoma Tribe to Install Solar Roof Oklahoma Tribe to Install Solar Roof Oklahoma Tribe to Install Solar Roof March 22, 2010 - 6:10pm Addthis Stephen Graff Former Writer & editor for Energy Empowers, EERE What does this project do? The new fully functioning roof and solar energy production plant will save the tribe about $20,000 a year. The Delaware Nation, a federally-recognized tribe of about 1,400 people in Anadarko, Okla., will install solar panel roofs on two tribal government buildings as part of a larger effort to become more sustainable and bring new jobs to an area struggling with high unemployment. "It's the start of a green initiative," says Theda McPheron-Keel, president of Wind Hollow Foundation, a nonprofit organization aimed at helping American Indians improve their lives. "It provides economic

205

A Cool Roof for the Iconic Cyclotron | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

A Cool Roof for the Iconic Cyclotron A Cool Roof for the Iconic Cyclotron A Cool Roof for the Iconic Cyclotron July 15, 2011 - 5:42pm Addthis Berkeley Lab's iconic building, the Advanced Light Source, is getting a new cool roof, righ, that will reflect sunlight back into the atmosphere, playing a small part in mitigating global warming. On left, Ernest Orlando Lawrence talks to colleagues at the construction site of the cyclotron, built in 1941. | Courtesy of Lawrence Berkeley National Laboratory; Roy Kaltschmidt, Berkeley Lab Public Affairs Berkeley Lab's iconic building, the Advanced Light Source, is getting a new cool roof, righ, that will reflect sunlight back into the atmosphere, playing a small part in mitigating global warming. On left, Ernest Orlando Lawrence talks to colleagues at the construction site of the cyclotron,

206

Oklahoma Tribe to Install Solar Roof | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Oklahoma Tribe to Install Solar Roof Oklahoma Tribe to Install Solar Roof Oklahoma Tribe to Install Solar Roof March 22, 2010 - 6:10pm Addthis Stephen Graff Former Writer & editor for Energy Empowers, EERE What does this project do? The new fully functioning roof and solar energy production plant will save the tribe about $20,000 a year. The Delaware Nation, a federally-recognized tribe of about 1,400 people in Anadarko, Okla., will install solar panel roofs on two tribal government buildings as part of a larger effort to become more sustainable and bring new jobs to an area struggling with high unemployment. "It's the start of a green initiative," says Theda McPheron-Keel, president of Wind Hollow Foundation, a nonprofit organization aimed at helping American Indians improve their lives. "It provides economic

207

Evaporative Roof Cooling - A Simple Solution to Cut Cooling Costs  

E-Print Network (OSTI)

Since the "Energy Crisis" Evaporative Roof Cooling Systems have gained increased acceptance as a cost effective method to reduce the high cost of air conditioning. Documented case histories in retrofit installations show direct energy savings and paybacks from twelve to thirty months. The main operating cost of an Evaporative Roof Cooling System is water. One thousand gallons of water, completely evaporated, will produce over 700 tons of cooling capability. Water usage seldom averages over 100 gallons per 1000 ft^2 of roof area per day or 10 oz. of water per 100 ft^2 every six minutes. Roof Cooling Systems, when planned in new construction, return 1-1/2 times the investment the first year in equipment savings and operating costs. Roof sprays are a low cost cooling solution for warehouses, distribution centers and light manufacturing or assembly areas with light internal loads. See text "Flywheel Cooling."

Abernethy, D.

1985-01-01T23:59:59.000Z

208

A Cool Roof for the Iconic Cyclotron | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

A Cool Roof for the Iconic Cyclotron A Cool Roof for the Iconic Cyclotron A Cool Roof for the Iconic Cyclotron July 15, 2011 - 5:42pm Addthis Berkeley Lab's iconic building, the Advanced Light Source, is getting a new cool roof, righ, that will reflect sunlight back into the atmosphere, playing a small part in mitigating global warming. On left, Ernest Orlando Lawrence talks to colleagues at the construction site of the cyclotron, built in 1941. | Courtesy of Lawrence Berkeley National Laboratory; Roy Kaltschmidt, Berkeley Lab Public Affairs Berkeley Lab's iconic building, the Advanced Light Source, is getting a new cool roof, righ, that will reflect sunlight back into the atmosphere, playing a small part in mitigating global warming. On left, Ernest Orlando Lawrence talks to colleagues at the construction site of the cyclotron,

209

Energy Performance Impacts from Competing Low-slope Roofing Choices and Photovoltaic Technologies.  

E-Print Network (OSTI)

??With such a vast quantity of space, commercial low-slope roofs offer significant potential for sustainable roofing technology deployment. Specifically, building energy performance can be improved (more)

Nagengast, Amy L.

2013-01-01T23:59:59.000Z

210

Become One In A Million: Partnership Updates -- Million Solar Roofs and Interstate Renewable Energy Council  

DOE Green Energy (OSTI)

The Million Solar Roofs Partnership Update is an annual report from all the Partnership and Partners who participate in the Million Solar Roofs Initiative.

Not Available

2004-06-01T23:59:59.000Z

211

Regional climate consequences of large-scale cool roof and photovoltai...  

NLE Websites -- All DOE Office Websites (Extended Search)

roofs, photovoltaics, radiative forcing, urban environment Abstract Modifications to the surface albedo through the deployment of cool roofs and pavements (reflective materials)...

212

Regional climate consequences of large-scale cool roof and photovoltai...  

NLE Websites -- All DOE Office Websites (Extended Search)

roof, photovoltaics, radiative forcing, urban environment Abstract Modifications to the surface albedo through the deployment of cool roofs and pavements (reflective materials) and...

213

Monitoring the Energy-Use Effects of Cool Roofs on California Commercial Buildings  

E-Print Network (OSTI)

can also reduce peak electricity demand. Cool roofs transferthe cool roof on peak electricity demand, we inspected theEstimate of Peak Electricity Demand Use and Savings Using

Akbari, Hashem; Levinson, Ronnen; Konopaki, Steve; Rainer, Leo

2004-01-01T23:59:59.000Z

214

Effectiveness of Cool Roof Coatings with Ceramic Particles  

SciTech Connect

Liquid applied coatings promoted as cool roof coatings, including several with ceramic particles, were tested at Oak Ridge National Laboratory (ORNL), Oak Ridge, Tenn., for the purpose of quantifying their thermal performances. Solar reflectance measurements were made for new samples and aged samples using a portable reflectometer (ASTM C1549, Standard Test Method for Determination of Solar Reflectance Near Ambient Temperature Using a Portable Solar Reflectometer) and for new samples using the integrating spheres method (ASTM E903, Standard Test Method for Solar Absorptance, Reflectance, and Transmittance of Materials Using Integrating Spheres). Thermal emittance was measured for the new samples using a portable emissometer (ASTM C1371, Standard Test Method for Determination of Emittance of Materials Near Room 1 Proceedings of the 2011 International Roofing Symposium Temperature Using Portable Emissometers). Thermal conductivity of the coatings was measured using a FOX 304 heat flow meter (ASTM C518, Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus). The surface properties of the cool roof coatings had higher solar reflectance than the reference black and white material, but there were no significant differences among coatings with and without ceramics. The coatings were applied to EPDM (ethylene propylene diene monomer) membranes and installed on the Roof Thermal Research Apparatus (RTRA), an instrumented facility at ORNL for testing roofs. Roof temperatures and heat flux through the roof were obtained for a year of exposure in east Tennessee. The field tests showed significant reduction in cooling required compared with the black reference roof (~80 percent) and a modest reduction in cooling compared with the white reference roof (~33 percent). The coating material with the highest solar reflectivity (no ceramic particles) demonstrated the best overall thermal performance (combination of reducing the cooling load cost and not incurring a large heating penalty cost) and suggests solar reflectivity is the significant characteristic for selecting cool roof coatings.

Brehob, Ellen G [ORNL; Desjarlais, Andre Omer [ORNL; Atchley, Jerald Allen [ORNL

2011-01-01T23:59:59.000Z

215

Flexible shaft and roof drilling system  

DOE Patents (OSTI)

A system for drilling holes in the roof of a mine has a flexible shaft with a pair of oppositely wound, coaxial flat bands. One of the flat bands defines an inner spring that is wound right handed into a helical configuration, adjacent convolutions being in nesting relationship to one another. The other flat band defines an outer spring that is wound left handed into a helical configuration about the inner band, adjacent convolutions being nesting relationship with one another. A transition member that is configured to hold a rock bit is mounted to one end of the flexible shaft. When torque and thrust are applied to the flexible shaft by a driver, the inner spring expands outwardly and the outer spring contracts inwardly to form a relatively rigid shaft.

Blanz, John H. (Carlisle, MA)

1981-01-01T23:59:59.000Z

216

Cool roofs as an energy conservation measure for federal buildings  

SciTech Connect

We have developed initial estimates of the potential benefits of cool roofs on federal buildings and facilities (building scale) as well as extrapolated the results to all national facilities under the administration of the Federal Energy Management Program (FEMP). In addition, a spreadsheet ''calculator'' is devised to help FEMP estimate potential energy and cost savings of cool roof projects. Based on calculations for an average insulation level of R-11 for roofs, it is estimated that nationwide annual savings in energy costs will amount to $16M and $32M for two scenarios of increased roof albedo (moderate and high increases), respectively. These savings, corresponding to about 3.8 percent and 7.5 percent of the base energy costs for FEMP facilities, include the increased heating energy use (penalties) in winter. To keep the cost of conserved energy (CCE) under $0.08 kWh-1 as a nationwide average, the calculations suggest that the incremental cost for cool roofs should not exceed $0.06 ft-2, assuming that cool roofs have the same life span as their non-cool counterparts. However, cool roofs usually have extended life spans, e.g., 15-30 years versus 10 years for conventional roofs, and if the costs of re-roofing are also factored in, the cutoff incremental cost to keep CCE under $0.08 kWh-1 can be much higher. In between these two ends, there is of course a range of various combinations and options.

Taha, Haider; Akbari, Hashem

2003-04-07T23:59:59.000Z

217

New Cool Roof Coatings and Affordable Cool Color Asphalt  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

New Cool Roof Coatings and New Cool Roof Coatings and Affordable Cool Color Asphalt Shingles Meng-Dawn Cheng Oak Ridge National Laboratory chengmd@ornl.gov; 865-241-5918 April 4, 2013 PM: Andre Desjarlais PI: Meng-Dawn Cheng, Ph.D. David Graham, Ph.D. Sue Carroll Steve Allman Dawn Klingeman Susan Pfiffner, Ph.D. (FY12) Karen Cheng (FY12) Partner: Joe Rokowski (Dow) Roof Testing Facility at ORNL Building Technologies Research and Integration Center 2 | Building Technologies Office eere.energy.gov * Building accounted for 41% of the US energy consumption in 2010 greater than either transportation (28%) or industry (31%).

218

New Cool Roof Coatings and Affordable Cool Color Asphalt  

NLE Websites -- All DOE Office Websites (Extended Search)

New Cool Roof Coatings and New Cool Roof Coatings and Affordable Cool Color Asphalt Shingles Meng-Dawn Cheng Oak Ridge National Laboratory chengmd@ornl.gov; 865-241-5918 April 4, 2013 PM: Andre Desjarlais PI: Meng-Dawn Cheng, Ph.D. David Graham, Ph.D. Sue Carroll Steve Allman Dawn Klingeman Susan Pfiffner, Ph.D. (FY12) Karen Cheng (FY12) Partner: Joe Rokowski (Dow) Roof Testing Facility at ORNL Building Technologies Research and Integration Center 2 | Building Technologies Office eere.energy.gov * Building accounted for 41% of the US energy consumption in 2010 greater than either transportation (28%) or industry (31%).

219

Energy Savings and Peak Demand Reduction of a SEER 21 Heat Pump vs. a SEER 13 Heat Pump with Attic and Indoor Duct Systems  

DOE Green Energy (OSTI)

This report describes results of experiments that were conducted in an unoccupied 1600 square foot house--the Manufactured Housing (MH Lab) at the Florida Solar Energy Center (FSEC)--to evaluate the delivered performance as well as the relative performance of a SEER 21 variable capacity heat pump versus a SEER 13 heat pump. The performance was evaluated with two different duct systems: a standard attic duct system and an indoor duct system located in a dropped-ceiling space.

Cummings, J.; Withers, C.

2011-12-01T23:59:59.000Z

220

Ethernet-Based Computer Monitoring the Roof Abscission Layer With Experts Forecasting System  

Science Conference Proceedings (OSTI)

China is a coal accident-prone country. In all coal accidents, the most serious incident is roof accident. Roof accidents are account for over 45% of the total mortality in coal enterprises. Roof accident is threatening the lives and safety of miners, ... Keywords: the roof abscission layer, on-line monitoring, displacement, Ethernet, expert system

Yong Zhan; Xianghong Yan; Hongmei Zhu; Yang Song

2008-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Status of cool roof standards in the United States  

E-Print Network (OSTI)

Updates on revision to ASHRAE Standard 90.2: including roof104(1B), pp. 984-995. ASHRAE. 1999. ASHRAE Standard 90.1-1999: Energy Standard for Buildings Except Low-Rise

Akbari, Hashem; Levinson, Ronnen

2008-01-01T23:59:59.000Z

222

Evolution of cool-roof standards in the United States  

E-Print Network (OSTI)

995. Evolution of cool roof standards in the United StatesMar/Apr, pp. 52-58. ASHRAE. 1999. ASHRAE Standard 90.1-1999: Energy Standard for Buildings Except Low- Rise

Akbari, Hashem

2008-01-01T23:59:59.000Z

223

Maui County - Solar Roofs Initiative Loan Program | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Maui County - Solar Roofs Initiative Loan Program Maui County - Solar Roofs Initiative Loan Program Maui County - Solar Roofs Initiative Loan Program < Back Eligibility Residential Savings Category Heating & Cooling Solar Water Heating Program Info State Hawaii Program Type Local Loan Program Rebate Amount Zero-interest loans Provider Maui Electric Company, LTD In September 2002, Maui Electric Company (MECO) and the County of Maui teamed up to launch the Maui Solar Roofs Initiative to increase the use of renewable energy in Maui County. MECO administers the loan program and, through the Hawaii Energy Program, offers a $750 rebate for installations through its approved independent solar contractors. Residential homeowners with existing electric water heaters are eligible and must provide a down payment equal to 35% of the system cost after

224

SCE Roof Project Solar Power Plant | Open Energy Information  

Open Energy Info (EERE)

SCE Roof Project Solar Power Plant SCE Roof Project Solar Power Plant Jump to: navigation, search Name SCE Roof Project Solar Power Plant Facility SCE Roof Project Sector Solar Facility Type Photovoltaic Developer First Solar Location California Coordinates 36.778261°, -119.4179324° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":36.778261,"lon":-119.4179324,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

225

Evolution of cool-roof standards in the United States  

E-Print Network (OSTI)

Locations of the eight ASHRAE-defined climate zones in the5.5.3.1 of ASHRAE 90.1-2004). climate zone roof U-factorASHRAE Figure 2. Locations of the 16 California climate zones (

Akbari, Hashem

2008-01-01T23:59:59.000Z

226

Evolution of cool-roof standards in the United States  

E-Print Network (OSTI)

roof provisions. Hawaii Building energy codes in Hawaii areadopted from the Hawaii Model Energy Code (Eley AssociatesHawaii; and Charles Eley, Architectural Energy Corporation for clarifying building codes.

Akbari, Hashem

2008-01-01T23:59:59.000Z

227

Status of cool roof standards in the United States  

E-Print Network (OSTI)

multipliers by U.S. climate zones (see Table 2). Table 1.5.5 of ASHRAE 90.2- Climate Zone Roof U-Factor Multiplierthermal resistances in climate zones 1 3 for ceilings

Akbari, Hashem; Levinson, Ronnen

2008-01-01T23:59:59.000Z

228

Countries Commit to White Roofs, Potentially Offsetting the Emissions...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

when the building is air-conditioned.1 On buildings without air conditioning, a white roof can reduce inside temperatures by 2 to 3 degrees Celsius (4 to 5 degrees Fahrenheit),...

229

A Climatological Measure of Extreme Snowdrift Loading on Building Roofs  

Science Conference Proceedings (OSTI)

A physical model of snow transport and deposition is used in combination with historical climatological data to derive a climatological measure of extreme snowdrift loads on building roofs. The snowdrift metric used relies on hourly wind speed, ...

Arthur T. DeGaetano; Michael J. O'Rourke

2004-01-01T23:59:59.000Z

230

The effects of roof reflectance on air temperatures surrounding...  

NLE Websites -- All DOE Office Websites (Extended Search)

the heating of condenser inlet air by the roof, and to assess the effects of condenser fan operation on the potential recirculation of hot discharge air from the condenser. The...

231

Evolution of cool-roof standards in the United States  

E-Print Network (OSTI)

require a sub-roof radiant barrier for residential buildings4, and 8 - 15), radiant barriers are not usually installedIn climates zones where radiant barriers are prescriptively

Akbari, Hashem

2008-01-01T23:59:59.000Z

232

Status of cool roof standards in the United States  

E-Print Network (OSTI)

requires a sub-roof radiant barrier in some climate zones (4, and 8 - 15), radiant barriers are not usually installedroofs. Without a radiant barrier, total savingsinitial cost

Akbari, Hashem; Levinson, Ronnen

2008-01-01T23:59:59.000Z

233

Developing Energy Efficient Roof Systems DEERS | Open Energy Information  

Open Energy Info (EERE)

Roof Systems DEERS Roof Systems DEERS Jump to: navigation, search Name Developing Energy Efficient Roof Systems (DEERS) Place Ripon, California Zip 95366 Sector Solar Product Developer of roof top solar PV projects. Coordinates 43.84582°, -88.837054° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.84582,"lon":-88.837054,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

234

Countries Commit to White Roofs, Potentially Offsetting the Emissions of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Countries Commit to White Roofs, Potentially Offsetting the Countries Commit to White Roofs, Potentially Offsetting the Emissions of Over 300 Power Plants Countries Commit to White Roofs, Potentially Offsetting the Emissions of Over 300 Power Plants April 8, 2011 - 4:26pm Addthis Dr. Art Rosenfeld Distinguished Scientist Emeritus at Lawrence Berkeley National Laboratory What does this project do? Builds energy savings. Promotes heat island mitigation and public health benefits. Encourages global cooling. I am delighted to learn that India, Mexico, and the United States have signed up to join the Cool Roofs Working Group, announced yesterday at the second Clean Energy Ministerial in Abu Dhabi. This working group was offered as part of the Clean Energy Ministerial, which is a high-level global forum to promote policies and programs that advance clean energy

235

CASE STUDY OF DUCT RETROFIT OF A 1985 HOME AND GUIDELINES FOR ATTIC AND CRAWL SPACE DUCT SEALING  

SciTech Connect

The U.S. Department of Energy (DOE) is fully committed to research for developing the information and capabilities necessary to provide cost-effective residential retrofits yielding 50% energy savings within the next several years. Heating, ventilation, and air conditioning (HVAC) is the biggest energy end use in the residential sector, and a significant amount of energy can be wasted through leaky ductwork in unconditioned spaces such as attics and crawl spaces. A detailed duct sealing case study is presented for one house along with nine brief descriptions of other duct retrofits completed in the mixed-humid climate. Costs and estimated energy savings are reported for most of the ten houses. Costs for the retrofits ranged from $0.92/ft2 to $1.80/ft2 of living space and estimated yearly energy cost savings due to the duct retrofits range from 1.8% to 18.5%. Lessons learned and duct sealing guidelines based on these ten houses, as well as close work with the HVAC industry in the mixed-humid climate of East Tennessee, northern Georgia, and south-central Kentucky are presented. It is hoped that the lessons learned and guidelines will influence local HVAC contractors, energy auditors, and homeowners when diagnosing or repairing HVAC duct leakage and will be useful for steering DOE s future research in this area.

Boudreaux, Philip R [ORNL; Christian, Jeffrey E [ORNL; Jackson, Roderick K [ORNL

2012-01-01T23:59:59.000Z

236

Inclusion of cool roofs in nonresidential Title 24 prescriptive requirements  

SciTech Connect

Roofs that have high solar reflectance (high ability to reflect sunlight) and high thermal emittance (high ability to radiate heat) tend to stay cool in the sun. The same is true of low-emittance roofs with exceptionally high solar reflectance. Substituting a cool roof for a noncool roof tends to decrease cooling electricity use, cooling power demand, and cooling-equipment capacity requirements, while slightly increasing heating energy consumption. Cool roofs can also lower the ambient air temperature in summer, slowing ozone formation and increasing human comfort. DOE-2.1E building energy simulations indicate that use of a cool roofing material on a prototypical California nonresidential building with a low-sloped roof yields average annual cooling energy savings of approximately 300 kWh/1000 ft2 [3.2 kWh/m2], average annual natural gas deficits of 4.9 therm/1000 ft2 [5.6 MJ/m2], average source energy savings of 2.6 MBTU/1000 ft2 [30 MJ/m2], and average peak power demand savings of 0. 19 kW/1000 ft2 [2.1 W/m2]. The 15-year net present value (NPV) of energy savings averages $450/1000 ft2 [$4.90/m2] with time dependent valuation (TDV), and $370/1000 ft2 [$4.00/m2] without TDV. When cost savings from downsizing cooling equipment are included, the average total savings (15-year NPV + equipment savings) rises to $550/1000 ft2 [$5.90/m2] with TDV, and to $470/1000 ft2 [$5.00/m2] without TDV. Total savings range from 0.18 to 0.77 $/ft2 [1.90 to 8.30 $/m2] with TDV, and from 0.16 to 0.66 $/ft2 [1.70 to 7.10 $/m2] without TDV, across California's 16 climate zones. The typical cost premium for a cool roof is 0.00 to 0.20 $/ft2 [0.00 to 2.20 $/m2]. Cool roofs with premiums up to $0.20/ft2 [$2.20/m2] are expected to be cost effective in climate zones 2 through 16; those with premiums not exceeding $0.18/ft2 [$1.90/m2] are expected to be also cost effective in climate zone 1. Hence, this study recommends that the year-2005 California building energy efficiency code (Title 24, Pa rt 6 of the California Code of Regulations) for nonresidential buildings with low-sloped roofs include a cool-roof prescriptive requirement in all California climate zones. Buildings with roofs that do not meet prescriptive requirements may comply with the code via an ''overall-envelope'' approach (non-metal roofs only), or via a performance approach (all roof types).

Levinson, Ronnen; Akbari, Hashem; Konopacki, Steve; Bretz, Sarah

2002-12-15T23:59:59.000Z

237

Rooftop Membrane Temperature Reductions with Green Roof Technology in South-Central Texas  

E-Print Network (OSTI)

Early green roof cooling and energy reduction research in North America took place in Canada and the northern latitudes of the United States, where green roofs reduced rooftop temperatures by 70% to 90%. Less is known about green roof technology in the southern Untied States; where energy demand for cooling buildings is high, and the urban heat island effect is more pronounced. This paper reports early findings for rooftop membrane temperature reductions from 11.6-cm-deep modular green roof trays, typical of large-scaled, low-maintenance applications. Measurements observed during May, 2010 reveal that temperatures below the modular planted green roof units were 82% to 91.6% cooler compared to the surface temperatures of the control roof membrane. These findings on low-input modular green roof trays reinforce other research findings that indicate green roof technology can dramatically reduce and modify temperatures on roof deck surfaces during peak energy demand periods in hot sunny climates.

Dvorak, B.

2010-08-01T23:59:59.000Z

238

Potential benefits of cool roofs on commercial buildings: conserving  

NLE Websites -- All DOE Office Websites (Extended Search)

cool roofs on commercial buildings: conserving cool roofs on commercial buildings: conserving energy, saving money, and reducing emission of greenhouse gases and air pollutants Title Potential benefits of cool roofs on commercial buildings: conserving energy, saving money, and reducing emission of greenhouse gases and air pollutants Publication Type Journal Article Year of Publication 2010 Authors Levinson, Ronnen M., and Hashem Akbari Journal Energy Efficiency Volume 3 Pagination 53-109 Publisher Springer Netherlands ISSN 1570-646X Keywords cool roof, Heat Island Abstract Cool roofs-roofs that stay cool in the sun by minimizing solar absorption and maximizing thermal emission-lessen the flow of heat from the roof into the building, reducing the need for space cooling energy in conditioned buildings. Cool roofs may also increase the need for heating energy in cold climates. For a commercial building, the decrease in annual cooling load is typically much greater than the increase in annual heating load. This study combines building energy simulations, local energy prices, local electricity emission factors, and local estimates of building density to characterize local, state average, and national average cooling energy savings, heating energy penalties, energy cost savings, and emission reductions per unit conditioned roof area. The annual heating and cooling energy uses of four commercial building prototypes-new office (1980+), old office (pre-1980), new retail (1980+), and old retail (pre-1980)-were simulated in 236 US cities. Substituting a weathered cool white roof (solar reflectance 0.55) for a weathered conventional gray roof (solar reflectance 0.20) yielded annually a cooling energy saving per unit conditioned roof area ranging from 3.30 kWh/m2 in Alaska to 7.69 kWh/m2 in Arizona (5.02 kWh/m2 nationwide); a heating energy penalty ranging from 0.003 therm/m2 in Hawaii to 0.14 therm/m2 in Wyoming (0.065 therm/m2 nationwide); and an energy cost saving ranging from $0.126/m2 in West Virginia to $1.14/m2 in Arizona ($0.356/m2 nationwide). It also offered annually a CO2 reduction ranging from 1.07 kg/m2 in Alaska to 4.97 kg/m2 in Hawaii (3.02 kg/m2 nationwide); an NOx reduction ranging from 1.70 g/m2 in New York to 11.7 g/m2 in Hawaii (4.81 g/m2 nationwide); an SO2 reduction ranging from 1.79 g/m2 in California to 26.1 g/m2 in Alabama (12.4 g/m2 nationwide); and an Hg reduction ranging from 1.08 μg/m2 in Alaska to 105 μg/m2 in Alabama (61.2 μg/m2 nationwide). Retrofitting 80% of the 2.58 billion square meters of commercial building conditioned roof area in the USA would yield an annual cooling energy saving of 10.4 TWh; an annual heating energy penalty of 133 million therms; and an annual energy cost saving of $735 million. It would also offer an annual CO2 reduction of 6.23 Mt, offsetting the annual CO2 emissions of 1.20 million typical cars or 25.4 typical peak power plants; an annual NOx reduction of 9.93 kt, offsetting the annual NOx emissions of 0.57 million cars or 65.7 peak power plants; an annual SO2 reduction of 25.6 kt, offsetting the annual SO2 emissions of 815 peak power plants; and an annual Hg reduction of 126 kg.

239

Top-of-atmosphere radiative cooling with white roofs: experimental  

NLE Websites -- All DOE Office Websites (Extended Search)

Top-of-atmosphere radiative cooling with white roofs: experimental Top-of-atmosphere radiative cooling with white roofs: experimental verification and model-based evaluation Title Top-of-atmosphere radiative cooling with white roofs: experimental verification and model-based evaluation Publication Type Journal Article Year of Publication 2012 Authors Salamanca, Francisco, Shaheen R. Tonse, Surabi Menon, Vishal Garg, Krishna P. Singh, Manish Naja, and Marc L. Fischer Journal Environmental Research Letters Volume 7 Issue 4 Abstract We evaluate differences in clear-sky upwelling shortwave radiation reaching the top of the atmosphere in response to increasing the albedo of roof surfaces in an area of India with moderately high aerosol loading. Treated (painted white) and untreated (unpainted) roofs on two buildings in northeast India were analyzed on five cloudless days using radiometric imagery from the IKONOS satellite. Comparison of a radiative transfer model (RRTMG) and radiometric satellite observations shows good agreement (R2 = 0.927). Results show a mean increase of ~50 W m-2 outgoing at the top of the atmosphere for each 0.1 increase of the albedo at the time of the observations and a strong dependence on atmospheric transmissivity.

240

Daylighter Daily Solar Roof Light | Open Energy Information  

Open Energy Info (EERE)

Daylighter Daily Solar Roof Light Daylighter Daily Solar Roof Light Jump to: navigation, search Name Daylighter Daily Solar Roof Light Address 1991 Crocker Road, Suite 600 Place Cleveland, Ohio Zip 44145 Sector Solar Product Installation; Manufacturing Phone number 440-892-3312 Website http://www.SolarLightisFree.co Coordinates 41.4648875°, -81.9506519° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.4648875,"lon":-81.9506519,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Building integrated photovoltaic (BIPV) roofs for sustainability and energy  

NLE Websites -- All DOE Office Websites (Extended Search)

integrated photovoltaic (BIPV) roofs for sustainability and energy integrated photovoltaic (BIPV) roofs for sustainability and energy efficiency Title Building integrated photovoltaic (BIPV) roofs for sustainability and energy efficiency Publication Type Report Year of Publication 2013 Authors Ly, Peter, George Ban-Weiss, Nathan Finch, Craig Wray, Mark de Ogburn, William W. Delp, Hashem Akbari, Scott Smaby, Ronnen Levinson, and Bret Gean Corporate Authors SEI Group Inc. Document Number ESTCP EW-200813 Pagination 156 pp. Date Published 09/2013 Publisher Naval Facilities Engineering Command - Engineering and Expeditionary Warfare Center Type Technical Report Report Number TR-NAVFAC-EXWC-PW-1303 Keywords Buildings Energy Efficiency, energy efficiency, Energy Usage, renewable energy, Renewable Energy: Policy & Programs Abstract

242

Solare Cell Roof Tile And Method Of Forming Same  

SciTech Connect

A solar cell roof tile includes a front support layer, a transparent encapsulant layer, a plurality of interconnected solar cells and a backskin layer. The front support layer is formed of light transmitting material and has first and second surfaces. The transparent encapsulant layer is disposed adjacent the second surface of the front support layer. The interconnected solar cells has a first surface disposed adjacent the transparent encapsulant layer. The backskin layer has a first surface disposed adjacent a second surface of the interconnected solar cells, wherein a portion of the backskin layer wraps around and contacts the first surface of the front support layer to form the border region. A portion of the border region has an extended width. The solar cell roof tile may have stand-offs disposed on the extended width border region for providing vertical spacing with respect to an adjacent solar cell roof tile.

Hanoka, Jack I. (Brookline, MA); Real, Markus (Oberberg, CH)

1999-11-16T23:59:59.000Z

243

Plain Talk About Condensation and Radiation Below Metal Roof Assemblies  

E-Print Network (OSTI)

During recent decades an increasing number of users have chosen metal roofing for various commercial, industrial and institutional buildings. Because of several advantages, construction of new pre-engineered and "hybrid" buildings has outpaced low-rise, nonresidential conventional construction since 1984. Unfortunately, some of these advantages may give rise to certain disadvantages in comfort, durability and operating costs (7). This paper provides a brief historical overview of common metal roof insulation methods as well as recent innovations for low cost/no cost performance enhancements. Following is a discussion of current industry trends and design considerations for those seeking to control the combined effects of conduction, convection, radiation and moisture migration in individual roof assemblies.

Ward, L.

1992-05-01T23:59:59.000Z

244

Improved Recovery from Gulf of Mexico Reservoirs, Volume 4, Comparison of Methane, Nitrogen and Flue Gas for Attic Oil. February 14, 1995 - October 13, 1996. Final Report  

SciTech Connect

Gas injection for attic oil recovery was modeled in vertical sandpacks to compare the process performance characteristics of three gases, namely methane, nitrogen and flue gas. All of the gases tested recovered the same amount of oil over two cycles of gas injection. Nitrogen and flue gas recovered oil more rapidly than methane because a large portion of the methane slug dissolved in the oil phase and less free gas was available for oil displacement. The total gas utilization for two cycles of gas injection was somewhat better for nitrogen as compared to methane and flue gas. The lower nitrogen utilization was ascribed to the lower compressibility of nitrogen.

Wolcott, Joanne; Shayegi, Sara

1997-01-13T23:59:59.000Z

245

Preliminary Analysis of Energy Consumption for Cool Roofing Measures  

SciTech Connect

The spread of cool roofing has been more than prolific over the last decade. Driven by public demand and by government initiatives cool roofing has been a recognized low cost method to reduce energy demand by reflecting sunlight away from structures and back in to the atmosphere. While much of the country can benefit from the use of cool coatings it remains to be seen whether the energy savings described are appropriate in cooler climates. By use of commonly available calculators one can analyze the potential energy savings based on environmental conditions and construction practices.

Mellot, Joe [The Garland Company; Sanyal, Jibonananda [ORNL; New, Joshua Ryan [ORNL

2013-01-01T23:59:59.000Z

246

Energy Saving 'Cool Roofs' Installed at Y-12 | Y-12 National Security  

NLE Websites -- All DOE Office Websites (Extended Search)

Saving 'Cool ... Saving 'Cool ... Energy Saving 'Cool Roofs' Installed at Y-12 Posted: October 17, 2012 - 4:08pm The Y-12 National Security Complex has taken additional steps to reduce its energy costs by installing almost 100,000 square feet of new heat reflective "cool" roofs at the Oak Ridge, Tennessee facility. The latest Y-12 cool roofs were added to Buildings 9204-2E and 9103. Fifteen percent of roofs at Y-12 are currently equipped with cool roof technology. This technology is expected to be applied to the majority of the roofs at Y-12. "Replacing older, heat-absorbing roofs with the heat-reflective cool roofs is part of NNSA's strategy to achieve energy and cost efficiencies," said Robert "Dino" Herrera, Facilities and Infrastructure Recapitalization Program Manager. "We strive to lead the

247

Blasting practices as they affect the roof of coal mines in Ohio, Pennsylvania, and West Virginia  

SciTech Connect

Coal beds and roof in the various States are described, State blasting regulations are noted, and methods of protecting roof and advantages gained by improved blasting practices are considered.

Geyer, J.N.

1933-01-01T23:59:59.000Z

248

A meeting of the minds when NYC CoolRoofs visits PPPL | Princeton...  

NLE Websites -- All DOE Office Websites (Extended Search)

visits PPPL By Jeanne Jackson DeVoe January 28, 2013 Tweet Widget Facebook Like Google Plus One Two visitors representing NYC CoolRoofs got a tour of PPPL's cool roof above...

249

Section 7.1.4 Low-Slope Roofing: Greening Federal Facilities...  

NLE Websites -- All DOE Office Websites (Extended Search)

rigid-foam roof insulation is loose-laid on top, and the insulation is protected by ballast. This configuration both in- creases the roof membrane life by protecting it from UV...

250

Inclusion of cool roofs in nonresidential Title 24 prescriptiverequirements  

Science Conference Proceedings (OSTI)

Roofs that have high solar reflectance (high ability toreflect sunlight) and high thermal emittance (high ability to radiateheat) tend to stay cool in the sun. The same is true of low-emittanceroofs with exceptionally high solar reflectance. Substituting a cool rooffor a non-cool roof tends to decrease cooling electricity use, coolingpower demand, and cooling-equipment capacity requirements, while slightlyincreasing heating energy consumption. Cool roofs can also lower citywideambient air temperature in summer, slowing ozone formation and increasinghuman comfort.DOE-2.1E building energy simulations indicate that use of acool roofing material on a prototypical California nonresidential (NR)building with a low-sloped roof yields average annual cooling energysavings of approximately 3.2 kW h/m2 (300 kW h/1000 ft2), average annualnatural gas deficits of 5.6 MJ/m2 (4.9 therm/1000 ft2), average annualsource energy savings of 30 MJ/m2 (2.6 MBTU/1000 ft2), and average peakpower demand savings of 2.1 W/m2 (0.19 kW/1000 ft2). The 15-year netpresent value (NPV) of energy savings averages $4.90/m2 ($450/1000 ft2)with time-dependent valuation (TDV), and $4.00/m2 ($370/1000 ft2) withoutTDV. When cost savings from downsizing cooling equipment are included,the average total savings (15-year NPV+equipment savings) rises to$5.90/m2 ($550/1000 ft2) with TDV, and to $5.00/m2 ($470/1000 ft2)without TDV.Total savings range from 1.90 to 8.30 $/m2 (0.18 0.77 $/ft2)with TDV, and from 1.70 to 7.10 $/m2 (0.16 0.66 $/ft2) without TDV,across California's 16 climate zones. The typical cost premium for a coolroof is 0.00 2.20 $/m2 (0.00 0.20 $/ft2). Cool roofs with premiums up to$2.20/m2 ($0.20/ft2) are expected to be cost effective in climate zones 216; those with premiums not exceeding $1.90/m2 ($0.18/ft2) are expectedto be also cost effective in climate zone 1. Hence, this study recommendsthat the year-2005 California building energy efficiency code (Title 24,Part 6 of the California Code of Regulations) for NR buildings withlow-sloped roofs include a cool-roof prescriptive requirement in allCalifornia climate zones. Buildings with roofs that do not meetprescriptive requirements may comply with the code via an"overall-envelope" approach (non-metal roofs only), or via a performanceapproach (all roof types).

Levinson, Ronnen; Akbari, Hashem; Konopacki, Steve; Bretz, Sarah

2003-07-01T23:59:59.000Z

251

More durable roof coverings such as steel and fiber cement  

E-Print Network (OSTI)

- heating equipment saves money. Tankless water heaters provide hot water on demand at a preset temperature. Lighter colors absorb less heat, reducing cooling costs in warm climates. Now, solar roofing products- cement siding is termite- and water-resistant and warrantied to last 50 years. Increasing the amount

252

Preliminary Analysis of Energy Consumption For Cool Roofing Measures  

E-Print Network (OSTI)

Preliminary Analysis of Energy Consumption For Cool Roofing Measures By Joe Mellott, Joshua New to reduce energy demand by reflecting sunlight away from structures and back into the atmosphere. By use of commonly available calculators, one can analyze the potential energy savings based on environmental

Tennessee, University of

253

ManualforEvaluatingtheThermalPerformanceofthe HamerschlagHallGreenRoof  

E-Print Network (OSTI)

maintenance costs. Reduced heating and cooling costs ­ Provides extra roof insulation. And reduction in the building's overall heating and cooling costs. Aesthetics ­ Makes the building attractive from aerial view, and provides building users a green space. Improved air quality ­ Plants can absorb carbon dioxide and other

Andrews, Peter B.

254

A whole building demonstration of re-cover over an existing wet roof  

SciTech Connect

Roof re-cover, the practice of installing a new roof over an existing failed roof, has become commonplace. The 1994 National Roofing Contractors Annual Roofing Survey reported that approximately 33% of current reroofing activity is re-cover. Market trends suggest that re-cover will become an increasingly more popular option. Moisture in the failed roof complicates the decision whether or not to re-cover and how to do the recover if that is the decision. If the root to be re-covered contains moisture that will not be removed during reroofing, this moisture must be able to escape from the roof system. Otherwise, moisture entrapped in the roofing system may eventually lead to the mechanical failure of fasteners and the roof deck, especially if it is metal. In 1991, the Oak Ridge National Laboratory (ORNL) surveyed its own roofing inventory and found that 164 buildings or 70% of the laboratory roof area needed reroofing. Because of the high cost of tear off and replacement, an alterative was sought. This paper describes the procedure employed to determine the suitability of a particular roof system on a laboratory building for re-covering. The procedure involves the use of field diagnostics, laboratory experiments and numerical simulations that demonstrate that the particular roof type can be re-covered. Furthermore, the building and roof system have been monitored for approximately 16 months after re-cover. The monitoring results are compared to the numerical simulations and demonstrate that the roof system is drying and that the reroofing strategy that they used is cost-effective.

Desjarlais, A.O.; Petrie, T.W.; Christian, J.E.; McLain, H.A.; Childs, P.W. [Oak Ridge National Lab., TN (United States). Energy Div.

1995-12-31T23:59:59.000Z

255

Load test of the 277W Building high bay roof deck and support structure  

SciTech Connect

The 277W Building high bay roof area was load tested according to the approved load-test procedure, WHC-SD-GN-TP-30015, Revision 1. The 277W Building is located in the 200 West Area of the Hanford Site and has the following characteristics: roof deck -- wood decking supported by 4 x 14 timber purlins; roof membrane -- tar and gravel; roof slope -- flat (<10 deg); and roof elevation -- maximum height of about 63 ft. The 227W Building was visited in March 1994 for a visual inspection. During this inspection, cracked areas were visible in the decking, but it was not possible to determine whether these cracks extended completely through the decking, which is 2-in. thick. The building was revisited in March 1994 for the purpose of writing this test report. Because the roof requires personnel access, a test was determined to be the best way to qualify the roof. The conclusions are that the roof has been qualified for 500-lb total roof load and that the ``No Roof Access`` signs can be changed to ``Roof Access Restricted`` signs.

McCoy, R.M.

1994-12-02T23:59:59.000Z

256

Load test of the 277W Building high bay roof deck and support structure  

Science Conference Proceedings (OSTI)

The 277W Building high bay roof area was load tested according to the approved load-test procedure, WHC-SD-GN-TP-30015, Revision 1. The 277W Building is located in the 200 West Area of the Hanford Site and has the following characteristics: roof deck -- wood decking supported by 4 x 14 timber purlins; roof membrane -- tar and gravel; roof slope -- flat (roof elevation -- maximum height of about 63 ft. The 227W Building was visited in March 1994 for a visual inspection. During this inspection, cracked areas were visible in the decking, but it was not possible to determine whether these cracks extended completely through the decking, which is 2-in. thick. The building was revisited in March 1994 for the purpose of writing this test report. Because the roof requires personnel access, a test was determined to be the best way to qualify the roof. The conclusions are that the roof has been qualified for 500-lb total roof load and that the ``No Roof Access`` signs can be changed to ``Roof Access Restricted`` signs.

McCoy, R.M.

1994-12-02T23:59:59.000Z

257

Load test of the 3701U Building roof deck and support structure  

SciTech Connect

The 3701U Building roof area was load tested according to the approved load-test procedure. The 3701U Building is located in the 300 Area of the Hanford Site and has the following characteristics: Roof deck--metal decking supported by steel purlins; Roof membrane--tar and gravel; Roof slope--flat (<10 deg); and Roof elevation--height of about 12.5 ft. The 3701U Building was visited in August 1992 for a visual inspection, but because of insulation an inspection could not be performed. The building was revisited in March 1994 for the purpose of writing this test report. Because the roof could not be inspected, a test was determined to be the best way to qualify the roof for personnel access. The test procedure called for the use of a remotely-controlled robot. The conclusions are that the roof has been qualified for 500-lb total roof load and that the ``No Roof Access`` signs can be changed to ``Roof Access Restricted`` signs.

McCoy, R.M.

1994-09-14T23:59:59.000Z

258

Load test of the 3701U Building roof deck and support structure  

Science Conference Proceedings (OSTI)

The 3701U Building roof area was load tested according to the approved load-test procedure. The 3701U Building is located in the 300 Area of the Hanford Site and has the following characteristics: Roof deck--metal decking supported by steel purlins; Roof membrane--tar and gravel; Roof slope--flat (Roof elevation--height of about 12.5 ft. The 3701U Building was visited in August 1992 for a visual inspection, but because of insulation an inspection could not be performed. The building was revisited in March 1994 for the purpose of writing this test report. Because the roof could not be inspected, a test was determined to be the best way to qualify the roof for personnel access. The test procedure called for the use of a remotely-controlled robot. The conclusions are that the roof has been qualified for 500-lb total roof load and that the ``No Roof Access`` signs can be changed to ``Roof Access Restricted`` signs.

McCoy, R.M.

1994-09-14T23:59:59.000Z

259

DOE Science Showcase - Cool roofs, cool research, at DOE | OSTI, US Dept of  

Office of Scientific and Technical Information (OSTI)

Cool roofs, cool research, at DOE Cool roofs, cool research, at DOE Science Accelerator returns cool roof documents from 6 DOE Databases Executive Order on Sustainability Secretary Chu Announces Steps to Implement One Cool Roof Cool Roofs Lead to Cooler Cities Guidelines for Selecting Cool Roofs DOE Cool Roof Calculator Visit the Science Showcase homepage. OSTI Homepage Mobile Gallery Subscribe to RSS OSTI Blog Get Widgets Get Alert Services OSTI Facebook OSTI Twitter OSTI Google+ Bookmark and Share (Link will open in a new window) Go to Videos Loading... Stop news scroll Most Visited Adopt-A-Doc DOE Data Explorer DOE Green Energy DOepatents DOE R&D Accomplishments .EDUconnections Energy Science and Technology Software Center E-print Network National Library of Energy OSTIblog Science.gov Science Accelerator

260

A Review of Methods for the Manufacture of Residential RoofingMaterials  

DOE Green Energy (OSTI)

Shingles, tiles, and metal products comprise over 80% (by roof area) of the California roofing market (54-58% fiberglass shingle, 8-10% concrete tile, 8-10% clay tile, 7% metal, 3% wood shake, and 3% slate). In climates with significant demand for cooling energy, increasing roof solar reflectance reduces energy consumption in mechanically cooled buildings, and improves occupant comfort in non-conditioned buildings. This report examines methods for manufacturing fiberglass shingles, concrete tiles, clay tiles, and metal roofing. The report also discusses innovative methods for increasing the solar reflectance of these roofing materials. We have focused on these four roofing products because they are typically colored with pigmented coatings or additives. A better understanding of the current practices for manufacturing colored roofing materials would allow us to develop cool colored materials creatively and more effectively.

Akbari, Hashem; Levinson, Ronnen; Berdahl, Paul

2003-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Measured energy savings of light colored roofs: Results from three California demonstration sites  

SciTech Connect

Measured data and computer simulations have demonstrated the impact of roof albedo in reducing cooling energy use in buildings. Savings are a function of both climate and the amount of roof insulation. The cooling energy savings for reflective roofs are highest in hot climates. A reflective roof may also lead to higher heating energy use. Reflective coatings are also used in commercial buildings to protect the roofing membrane, and hence, maintain and prolong the useful life of the roof. Reflectivity of coatings changes with weathering and aging which in turn could have an effect on building cooling-energy savings. For that reason, reflective roof coatings are not primarily marketed for their energy savings potential. To monitor the field performance of reflective coatings, the authors initiated a demonstration project where three commercial buildings in California were painted with light-colored roof coatings. The buildings are two medical care centers and one drug store. At all sites, the roof reflectance, both fresh and aged, and cooling energy use were monitored. In addition, they measured temperature throughout the roof systems and inside the conditioned space. In the monitored buildings, increasing the roof reflectance from an initial value of about 20% to 60%, dropped the roof temperature on hot summer afternoons by about 45 F. Summertime standard-weekday average daily air-conditioning savings were 18% (198 kWh) in the first medical office building, 13% (86 kWh) in the second medical office building, and 2% (13 kWh) in the drug store. The overall u-value of the roofs had dictated the impact of roof reflectance.

Akbari, H.; Gartland, L.; Konopacki, S.

1998-06-01T23:59:59.000Z

262

Thermal Performance Evaluation of Innovative Metal Building Roof Assemblies  

Science Conference Proceedings (OSTI)

In order to meet the coming energy codes, multiple layers of various insulation types will be required. The demand for greater efficiency has pushed insulation levels beyond the cavity depth. These experiments show the potential for improving metal building roof thermal performance. Additional work is currently being done by several stakeholders, so the data is expanding. These experiments are for research and development purposes, and may not be viable for immediate use.

Walker, Daniel James [ORNL; Zaltash, Abdolreza [ORNL; Atchley, Jerald Allen [ORNL

2011-01-01T23:59:59.000Z

263

Equilibrium thermal characteristics of a building integrated photovoltaic tiled roof  

SciTech Connect

Photovoltaic (PV) modules attain high temperatures when exposed to a combination of high radiation levels and elevated ambient temperatures. The temperature rise can be particularly problematic for fully building integrated PV (BIPV) roof tile systems if back ventilation is restricted. PV laminates could suffer yield degradation and accelerated aging in these conditions. This paper presents a laboratory based experimental investigation undertaken to determine the potential for high temperature operation in such a BIPV installation. This is achieved by ascertaining the dependence of the PV roof tile temperature on incident radiation and ambient temperature. A theory based correction was developed to account for the unrealistic sky temperature of the solar simulator used in the experiments. The particular PV roof tiles used are warranted up to an operational temperature of 85 C, anything above this temperature will void the warranty because of potential damage to the integrity of the encapsulation. As a guide for installers, a map of southern Europe has been generated indicating locations where excessive module temperatures might be expected and thus where installation is inadvisable. (author)

Mei, L.; Gottschalg, R.; Loveday, D.L. [Centre for Renewable Energy Systems Technology (CREST), Department of Electronic and Electrical Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU (United Kingdom); Infield, D.G. [Institute of Energy and Environment, Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, G1 1XW (United Kingdom); Davies, D.; Berry, M. [Solarcentury, 91-94 Lower Marsh Waterloo, London, SE1 7AB (United Kingdom)

2009-10-15T23:59:59.000Z

264

Secretary Chu Announces Steps to Implement Cool Roofs at DOE and Across the  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Steps to Implement Cool Roofs at DOE and Steps to Implement Cool Roofs at DOE and Across the Federal Government Secretary Chu Announces Steps to Implement Cool Roofs at DOE and Across the Federal Government July 19, 2010 - 12:00am Addthis Washington - U.S. Department of Energy Secretary Steven Chu today announced a series of initiatives underway at the Department of Energy to more broadly implement cool roof technologies on DOE facilities and buildings across the federal government. Cool roofs use lighter-colored roofing surfaces or special coatings to reflect more of the sun's heat, helping improve building efficiency by reducing cooling costs and offsetting carbon emissions. President Obama and Secretary Chu have made clear that the federal government should play a leading role in moving the nation toward a more

265

Load test of the 272E Building high bay roof deck and support structure  

SciTech Connect

The 272E Building high bay roof area was load tested according to the approved load-test procedure. The 272E Building is located in the 200 East Area of the Hanford Site and has the following characteristics: Roof deck -- wood decking supported by 4 x 14 timber purlins; Roof membrane -- tar and gravel; Roof slope -- flat (<10 deg); and Roof elevation -- maximum height of about 63 ft. The 272 Building was visited in August 1992 for a visual inspection. During this inspection, cracked areas were visible in the decking, but it was not possible to determine whether these cracks extended completely through the decking, which is 2-in. thick. The building was revisited in March 1994 for the purpose of writing this test report. Because the roof requires personnel access, a test was determine to be the best way to qualify the roof. The pre-test briefing consisted of filling out the pre-test checklist, discussing proper lifting techniques, reviewing the fall-protection plan, reviewing the job hazards analysis, and reviewing the robot travel path. The load-test results consist of visual observations and the test engineer`s conclusions. Visual observations found no adverse conditions such as large deflections or permanent deformations. No deflection measurements were recorded because the tar and gravel on roof get displaced by the robot tracks; the result is large variations in deflection measurements. The conclusions are that the roof has been qualified for 500-lb total roof load and that the ``No Roof Access`` signs can be changed to ``Roof Access Restricted`` signs.

McCoy, R.M.

1994-11-01T23:59:59.000Z

266

Monitoring the Energy-Use Effects of Cool Roofs on California Commercial Buildings  

DOE Green Energy (OSTI)

Solar-reflective roofs stay cooler in the sun than solar-absorptive roofs. Such ''cool'' roofs achieve lower surface temperatures that reduce heat conduction into the building and the building's cooling load. The California Energy Commission has funded research in which Lawrence Berkeley National Laboratory (LBNL) has measured the electricity use and peak demand in commercial buildings to document savings from implementing the Commission's Cool Roofs program. The study seeks to determine the savings achieved by cool roofs by monitoring the energy use of a carefully selected assortment of buildings participating in the Cool Roofs program. Measurements were needed because the peak savings resulting from the application of cool roofs on different types of buildings in the diverse California climate zones have not been well characterized to date. Only a few occupancy categories (e.g., office and retail buildings) have been monitored before this, and those were done under a limited number of climatic conditions. To help rectify this situation, LBNL was tasked to select the buildings to be monitored, measure roof performance before and after replacing a hot roof by a cool roof, and document both energy and peak demand savings resulting from installation of cool roofs. We monitored the effects of cool roofs on energy use and environmental parameters in six California buildings at three different sites: a retail store in Sacramento; an elementary school in San Marcos (near San Diego); and a 4-building cold storage facility in Reedley (near Fresno). The latter included a cold storage building, a conditioning and fruit-palletizing area, a conditioned packing area, and two unconditioned packing areas (counted as one building).

Akbari, Hashem; Levinson, Ronnen; Konopaki, Steve; Rainer, Leo

2004-07-01T23:59:59.000Z

267

Advances in Measuring Solar Reflectance-or, Why That Roof isn...  

NLE Websites -- All DOE Office Websites (Extended Search)

reflectance is often used to estimate the solar heat gain and rate the "coolness" of roofs and pavements. A solar reflectance property measured by two popular ASTM standard...

268

Geomechanical and weathering properties of weak roof shales in coal mines.  

E-Print Network (OSTI)

??Many coal seams have weak shale immediate roofs that cause ground control problems. Therefore, it is important to know the properties of these shales so (more)

Gurgenli, Hakan.

2006-01-01T23:59:59.000Z

269

Performance Comparison of a BIPV Roofing Tile System in Two Mounting Configurations (Poster)  

DOE Green Energy (OSTI)

This work examined the thermal and power characteristics of a building-integrated photovoltaic (BIPV) roofing system using two installation techniques, counter-batten and direct-mount.

Muller, M.; Rodriquez, J.; Marion, B.

2009-06-01T23:59:59.000Z

270

Green Roof Implementation in Washington, DC: A Stormwater Management Tool for an Impervious Urban Environment.  

E-Print Network (OSTI)

??Green roofs have potential environmental and economic benefits of great consequence for our major cities if implemented at a broad scale. These benefits are beginning (more)

Zipp, Harriet

2008-01-01T23:59:59.000Z

271

Sensitivity of Low Sloped Roofs Designs to Initial Water and Air Leakage  

E-Print Network (OSTI)

Liquid water in low sloped roofs almost always causes problems. Roofs are designed only to control the migration of vapor, if at all. Small amounts of water leakage/penetration, may cause mold growth or catastrophic corrosion in current roofs systems. In a recent paper by the authors the effect of exterior surface emissive and absorptive properties was found to have a significant effect on the moisture performance of a roof that had a leak. Depending on the surface characteristics, roof systems can be designed to effectively manage water penetration, but at an energy cost. In the roofs system examined previously, air leakage was not included. In the present study, the authors reinvestigated the effect of water penetration and the influence of air leakage on the hygrothermal performance of a few selected roofs. The drying potential of a groove ventilated roof is examined. The performance concept is based on the fact that warming up of air in the groove increases it's ability to transport moisture to the outside. Solar radiation raises the temperature of air in the grooves and on average, during a sunny summer day 0.5 L of water can be ventilated out of the roof per 1m width of the roof. In this paper, one climatic condition was investigated; a hot and humid Climate representative of Houston, TX. The specific questions that the paper addresses are: What are the vapor and liquid control dynamic involved in the moisture migration of a roof in Houston TX? and how does airflow influence the performance of a roof that is initially wet ? A state-of-the-art numerical model was used to address these issues. Results showed that the drying potential depends on the ventilation rates. The roof system with ventilation grooves dried out faster from the initially wet stage than the roof without the ventilation grooves. The total increase in heat loss of the roof was found to be between 0 - 5 % depending on the thickness of the insulation. The ventilation can cool down the temperature of the roof in the middle of a hot and sunny day thus reducing the heat load to the inside.

Karagiozis, A.; Desjarlais, A.; Salonvaara, M.

2002-01-01T23:59:59.000Z

272

Radiative cooling and solar heating potential by using various roofing materials  

Science Conference Proceedings (OSTI)

The results of testing over twenty typical and potential roofing materials such as: corrugated galvanized steel, corrugated clear fiberglass, 90number black roll roofing, 90number green roll roofing, 90number red roll roofing, 90number brown roll roofing, 90number white roll roofing, 240number brown asphalt shingles, anodized aluminum, etc. under exposure to solar and nocturnal sky radiation are presented. Some cadmium sulfite solar cells and silicon solar cells are being tested as potential future roofing panels. Graphs showing the temperature variation of each material versus testing time are given for a heating and a cooling cycle. The environmental conditions of testing such as: solar insolation, apparent sky temperature, ambient air temperature, relative humidity and wind speed are also given. On the basis of preliminary results obtained during the testing of roofing materials, several mini-modules of an integrated collector/radiator/ roof element with the dimensions 0.6 m x 0.6 m (2 ft x 2 ft) were constructed and tested. The thermal response of the mini-modules under solar and nocturnal sky radiation is shown and the testing results are discussed. The spectral transmittance curves for nine transparent cover materials are also presented. The preliminary results indicate that solar radiation and nocturnal sky radiation could be used effectively by employing an integrated collector/radiator structure.

Pytlinski, J.T.; Connell, H.L.; Conrad, G.R.

1980-12-01T23:59:59.000Z

273

Performance Comparison of a BIPV Roofing Tile System in Two Mounting Configurations: Preprint  

DOE Green Energy (OSTI)

This work examined the thermal and power characteristics of a building-integrated photovoltaic (BIPV) roofing system using two installation techniques, counter-batten and direct-mount.

Muller, M. T.; Rodrigeuz, J.; Marion, B.

2009-06-01T23:59:59.000Z

274

Monitoring the Energy-Use Effects of Cool Roofs on California Commercial Buildings  

E-Print Network (OSTI)

Post: Pyranometer: Radiant barrier: Roof underside: RTD:w/mineral capsheet, multi-year radiant barrier White coatingMulti-layer radiant barrier (R-7 equivalent) San Marcos

Akbari, Hashem; Levinson, Ronnen; Konopaki, Steve; Rainer, Leo

2004-01-01T23:59:59.000Z

275

Monitoring the Energy-Use Effects of Cool Roofs on California Commercial Buildings  

E-Print Network (OSTI)

Radiant barrier: Roof underside: RTD: RTU: SDREO: SEER: SkyType T thermocouple AD592 RTD in Gill radiation shieldwere measured with Minco RTD thermal ribbon sensors

Akbari, Hashem; Levinson, Ronnen; Konopaki, Steve; Rainer, Leo

2004-01-01T23:59:59.000Z

276

Asphalt Roofing Shingles Into Energy Project Summary Report  

DOE Green Energy (OSTI)

Based on a widely cited September, 1999 report by the Vermont Agency of Natural Resources, nearly 11 million tons of asphalt roofing shingle wastes are produced in the United States each year. Recent data suggests that the total is made up of about 9.4 million tons from roofing tear-offs and about 1.6 million tons from manufacturing scrap. Developing beneficial uses for these materials would conserve natural resources, promote protection of the environment and strengthen the economy. This project explored the feasibility of using chipped asphalt shingle materials in cement manufacturing kilns and circulating fluidized bed (CFB) boilers. A method of enhancing the value of chipped shingle materials for use as fuel by removing certain fractions for use as substitute raw materials for the manufacture of new shingles was also explored. Procedures were developed to prevent asbestos containing materials from being processed at the chipping facilities, and the frequency of the occurrence of asbestos in residential roofing tear-off materials was evaluated. The economic feasibility of each potential use was evaluated based on experience gained during the project and on a review of the well established use of shingle materials in hot mix asphalt. This project demonstrated that chipped asphalt shingle materials can be suitable for use as fuel in circulating fluidized boilers and cement kilns. More experience would be necessary to determine the full benefits that could be derived and to discover long term effects, but no technical barriers to full scale commercial use of chipped asphalt shingle materials in these applications were discovered. While the technical feasibility of various options was demonstrated, only the use of asphalt shingle materials in hot mix asphalt applications is currently viable economically.

Jameson, Rex, PE

2008-04-28T23:59:59.000Z

277

Cooling energy savings potential of light-colored roofs for residential and commercial buildings in 11 US metropolitan areas  

SciTech Connect

Light-colored roofs reflect more sunlight than dark roofs, thus they keep buildings cooler and reduce air-conditioning demand. Typical roofs in the United States are dark, which creates a potential for savings energy and money by changing to reflective roofs. In this report, the authors make quantitative estimates of the impact of roof color by simulating prototypical buildings with light- and dark-colored roofs and calculating savings by taking the differences in annual cooling and heating energy use, and peak electricity demand. Monetary savings are calculated using local utility rates. Savings are estimated for 11 U.S. Metropolitan Statistical Areas (MSAs) in a variety of climates.

Konopacki, S.; Akbari, H.; Pomerantz, M.; Gabersek, S.; Gartland, L.

1997-05-01T23:59:59.000Z

278

Roof Integrated Solar Absorbers: The Measured Performance of ''Invisible'' Solar Collectors: Preprint  

DOE Green Energy (OSTI)

The Florida Solar Energy Center (FSEC), with the support of the National Renewable Energy Laboratory, has investigated the thermal performance of solar absorbers that are an integral, yet indistinguishable, part of a building's roof. The first roof-integrated solar absorber (RISA) system was retrofitted into FSEC's Flexible Roof Facility in Cocoa, Florida, in September 1998. This ''proof-of-concept'' system uses the asphalt shingle roof surface and the plywood decking under the shingles as an unglazed solar absorber. Data was gathered for a one-year period on the system performance. In Phase 2, two more RISA prototypes were constructed and submitted for testing. The first used the asphalt shingles on the roof surface with the tubing mounted on the underside of the plywood decking. The second prototype used metal roofing panels over a plywood substrate and placed the polymer tubing between the plywood decking and the metal roofing. This paper takes a first look at the thermal performance results for the ''invisible'' solar absorbers that use the actual roof surface of a building for solar heat collection.

Colon, C. J. (Florida Solar Energy Center); Merrigan, T. (National Renewable Energy Laboratory)

2001-10-19T23:59:59.000Z

279

Effects of Urban Surfaces and White Roofs on Global and Regional Climate  

Science Conference Proceedings (OSTI)

Land use, vegetation, albedo, and soil-type data are combined in a global model that accounts for roofs and roads at near their actual resolution to quantify the effects of urban surface and white roofs on climate. In 2005, ~0.128% of the ...

Mark Z. Jacobson; John E. Ten Hoeve

2012-02-01T23:59:59.000Z

280

Preliminary Study of a Vented Attic Radiant Barrier System in Hot, Humid Climates Using Side-by-Side, Full-Scale Test Houses  

E-Print Network (OSTI)

A series of side-by-side tests was performed using two full scale test houses to determine the effectiveness of a Vented Radiant Barrier System (VRBS) in reducing the ceiling heat flux during the summer cooling season in North Florida. Another series of side-by-side tests was conducted to evaluate the effect of a VRBS on ceiling heat losses under typical North Florida winter conditions. The effect of a VRBS on the expected life of roof shingles was also evaluated.

Lear, W. E.; Barrup, T. E.; Davis, K. E.

1987-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

A guidebook for insulated low-slope roof systems. IEA Annex 19, Low-slope roof systems: International Energy Agency Energy Conservation in Buildings and Community Systems Programme  

SciTech Connect

Low-slope roof systems are common on commercial and industrial buildings and, to a lesser extent, on residential buildings. Although insulating materials have nearly always been a component of low-slope roofs, the amount of insulation used has increased in the past two decades because of escalation of heating and cooling costs and increased awareness of the need for energy conservation. As the amount of insulation has increased, the demand has intensified for design, installation, and maintenance information specifically for well-insulated roofs. Existing practices for design, installation, and maintenance of insulated roofs have evolved from experience. Typically, these practices feature compromises due to the different properties of materials making up a given roof system. Therefore, they should be examined from time to time to ensure that they are appropriate as new materials continue to enter the market and as the data base on existing systems expands. A primary purpose of this International Energy Agency (IEA) study is to assess current roofing insulation practices in the context of an accumulating data base on performance.

Not Available

1994-02-01T23:59:59.000Z

282

Seismic Evidence For A Hydrothermal Layer Above The Solid Roof Of The Axial  

Open Energy Info (EERE)

Evidence For A Hydrothermal Layer Above The Solid Roof Of The Axial Evidence For A Hydrothermal Layer Above The Solid Roof Of The Axial Magma Chamber At The Southern East Pacific Rise Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Seismic Evidence For A Hydrothermal Layer Above The Solid Roof Of The Axial Magma Chamber At The Southern East Pacific Rise Details Activities (1) Areas (1) Regions (0) Abstract: A full-waveform inversion of two-ship, wide-aperture, seismic reflection data from a ridge-crest seismic line at the southern East Pacific Rise indicates that the axial magma chamber here is about 50 m thick, is embedded within a solid roof, and has a solid floor. The 50-60-m-thick roof is overlain by a 150-200-m-thick low-velocity zone that may correspond to a fracture zone that hosts the hydrothermal circulation,

283

Artificial neural networks for predicting indoor temperature using roof passive cooling techniques in buildings in different climatic conditions  

Science Conference Proceedings (OSTI)

Three passive cooling methods (e.g. roof pond, reflective roof cooling and using insulation over the roof) have been experimentally evaluated using an experimental test structure. The objective of this work is to train an artificial neural network (ANN) ... Keywords: Artificial neural network, Energy saving, India, Passive cooling, Thermal comfort

Shrikant Pandey; D. A. Hindoliya; Ritu Mod

2012-03-01T23:59:59.000Z

284

Quantum Fisher Information as the Convex Roof of Variance  

E-Print Network (OSTI)

Quantum Fisher information places the fundamental limit to the accuracy of estimating an unknown parameter. Here we shall provide the quantum Fisher information an operational meaning: a mixed state can be so prepared that a given observable has the minimal averaged variance, which equals exactly to the quantum Fisher information for estimating an unknown parameter generated by the unitary dynamics with the given observable as Hamiltonian. In particular we shall prove that the quantum Fisher information is the convex roof of the variance, as conjectured by Toth and Petz based on numerical and analytical evidences, by constructing explicitly a pure-state ensemble of the given mixed state in which the averaged variance of a given observable equals to the quantum Fisher information.

Sixia Yu

2013-02-21T23:59:59.000Z

285

Pilot aerial infrared roof top survey. Final report  

SciTech Connect

A summary is presented of a pilot aerial infrared roof top study conducted by the Minnesota Energy Agency. Infrared surveys of 27 Minnesota cities were conducted during the fall and winter of the 1976-1977 heating season. In addition, conventional daytime color photographs were taken of several cities. Film processing was done by the Environmental Protection Agency. The University of Minnesota conducted ground tests to verify the aerial infrared imagery. Thermograph dissemination centers were established in each city and training seminars and materials were prepared and delivered to dissemination center staff. A survey of homeowners who viewed their thermograph at a dissemination center were used to determine the energy savings resulting from the program. An Aerial Infrared Program Users Manual was prepared by the Energy Agency and the Remote Sensing Institute of Brookings, South Dakota.

1979-10-15T23:59:59.000Z

286

Research on the Effect of a Planting Roof on the Thermal Load of a Business Building  

E-Print Network (OSTI)

A pair of comparative testing rooms (one with an ordinary roof and the other with a planting roof) was established in our laboratory, and in- situ measurement (in summer) data have been collected and treated. The indoor thermal environment was analyzed and the thermal load within each room was calculated Comparative analysis of thermal loads of these two rooms was done. Reduction of thermal load by the planting roof is clearly shown from our research work. A theoretical analysis of the effect of the planting roof on the room's thermal load was done, and theoretical relations between outdoor air temperature and indoor thermal load within certain region were established. The feasibility analysis of the application of our research work to the business building was also completed. The summer cooling load reduction characteristics, the energy saving characteristics on air conditioning system, the yearly electricity consumption reduction, the yearly consumption amount reduction of Primary Energy, the discharge amount reduction of sensible heat to outdoor atmosphere in summer, and the yearly discharge amount reduction of greenhouse gases to the outdoor atmosphere from air conditioning system due to the planting roof are also predicted. A corresponding economic analysis is also presented in this paper. The results show the advantages of the planting roof, and also promote the widespread application of the planting roof to business buildings.

Zhang, W.; Wu, J.; Wei, Y.; Gao, X.

2006-01-01T23:59:59.000Z

287

Delivering tons to the register: Energy efficient design and operation of residential cooling systems  

E-Print Network (OSTI)

and sealing the attic. Introduction Residential central airsealing, refrigerant charge addition, and correction of reduced airsealing the attic and insulating the roof) is a practical way to improve air

Siegel, Jeffrey; Walker, Iain; Sherman, Max

2000-01-01T23:59:59.000Z

288

Application of Spray Foam Insulation Under Plywood and Oriented Strand Board Roof Sheathing  

SciTech Connect

Unvented roof strategies with open cell and closed cell spray polyurethane foam insulation sprayed to the underside of roof sheathing have been used since the mid-1990's to provide durable and efficient building enclosures. However, there have been isolated moisture related incidents reported anecdotally that raise potential concerns about the overall hygrothermal performance of these systems. The incidents related to rainwater leakage and condensation concerns. Condensation concerns have been extensively studied by others and are not further discussed in this report. This project involved hygrothermal modeling of a range of rainwater leakage and field evaluations of in-service residential roofs using spray foam insulation. All of the roof assemblies modeled exhibited drying capacity to handle minor rainwater leakage. All field evaluation locations of in-service residential roofs had moisture contents well within the safe range for wood-based sheathing. Explorations of eleven in-service roof systems were completed. The exploration involved taking a sample of spray foam from the underside of the roof sheathing, exposing the sheathing, then taking a moisture content reading. All locations had moisture contents well within the safe range for wood-based sheathing. One full-roof failure was reviewed, as an industry partner was involved with replacing structurally failed roof sheathing. In this case the manufacturer's investigation report concluded that the spray foam was installed on wet OSB based on the observation that the spray foam did not adhere well to the substrate and the pore structure of the closed cell spray foam at the ccSPF/OSB interface was indicative of a wet substrate.

Grin, A.; Smegal, J.; Lstiburek, J.

2013-10-01T23:59:59.000Z

289

Design, effectiveness, and construction of passive-thermal-control roofing shingles. Technical final report  

Science Conference Proceedings (OSTI)

The concept of a passive thermal control roofing shingle, which is a shingle that reflects the summer sun and absorbs the winter sun, is discussed. Such a shingle will reduce summer cooling and winter heating costs and conserve electricity and natural gas or heating oil. Design calculations indicate that it is possible to design shingles for particular latitudes and styles of roof which absorb nearly all of the winter solar energy and reflect nearly all of the summer solar energy. Calculations of the energy savings and cost effectiveness of the passive thermal control roofing shingle indicate that it is most cost effective on all south facing pitched roofs regardless of heating fuel type, and on flat or east or west facing roofs that are heated with costly fuels such as electricity or heating oil. The shingle is most effective on poorly insulated structures. If the cost of the shingle is about one dollar per square foot it will be cost effective in these applications. Additional calculations demonstrate the feasibility of using the passive thermal control roofing shingle in conjunction with a heat pump to pump heat absorbed by the shingle into a well insulated structure. Construction of a variety of models of the passive thermal control roofing shingle illustrate numerous alternate methods of manufacture. A profile extruded, plastic, glazed shingle appears to be the most promising approach. Additionally, extruded plastic reflector assemblies of various kinds could be added to existing shingled roofs. Use of a glazed shingle can increase the effectiveness of the passive thermal control roofing shingle by reducing convective heat losses.

Wolf, L. Jr.

1982-09-01T23:59:59.000Z

290

Condensation Risk of Mechanically Attached Roof Systems in Cold Climate Zones  

Science Conference Proceedings (OSTI)

A white roof, cool roof, is constructed to decrease thermal loads from solar radiation, therefore saving energy by decreasing the cooling demands. Unfortunately, cool roofs with mechanically attached membrane, have shown to have a higher risk of intermediate condensation in the materials below the membrane in certain climates (Ennis & Kehrer, 2011) and in comparisons with similar construction with a darker exterior surface (Bludau, Zirkelbach, & Kuenzel, 2009). As a consequence, questions have been raised regarding the sustainability and reliability of using cool roof membranes in Northern U.S. climate zones. A white roof surface reflects more of the incident solar radiation in comparisons with a dark surface, which makes a distinguished difference on the surface temperature of the roof. However, flat roofs with either a light or dark surface and if facing a clear sky, are constantly losing energy to the sky due to the exchange of infrared radiation. This phenomenon exists both during the night and the day. During the day, if the sun shines on the roof surface, the exchange of infrared radiation typically becomes insignificant. During nights and in cold climates, the temperature difference between the roof surface and the sky can deviate up to 20 C (Hagentoft, 2001) which could result in a very cold surface temperature compared to the ambient temperature. Further, a colder surface temperature of the roof increases the energy loss and the risk of condensation in the building materials below the membrane. In conclusion, both light and dark coated roof membranes are cooled by the infrared radiation exchange during the night, though a darker membrane is more heated by the solar radiation during the day, thus decreasing the risk of condensation. The phenomenon of night time cooling from the sky and the lack of solar gains during the day is not likely the exclusive problem concerning the risk of condensation in cool roofs with mechanically attached membranes. Roof systems with thermoplastic membranes are prone to be more effected by interior air intrusion into the roof construction; both due to the wind induced pressure differences and due to the flexibility and elasticity of the membrane (Molleti, Baskaran, Kalinger, & Beaulieu, 2011). Depending on the air permeability of the material underneath the membrane, wind forces increase the risk of fluttering (also referred as billowing) of the thermoplastic membrane. Expectably, the wind induced pressure differences creates a convective air flow into the construction i.e. Page 2 air intrusion. If the conditions are right, moisture from the exchanging air may condensate on surfaces with a temperature below dew-point. The definite path of convective airflows through the building envelope is usually very difficult to determine and therefore simplified models (K nzel, Zirkelbach, & Scfafaczek, 2011) help to estimate an additional moisture loads as a result of the air intrusion. The wind uplifting pressure in combination with wind gusts are important factors for a fluttering roof. Unfortunately, the effect from a fluctuating wind is difficult to estimate as this is a highly dynamic phenomenon and existing standards (ASTM, 2011a) only take into account a steady state approach i.e. there is no guidance or regulations on how to estimate the air intrusion rate. Obviously, a more detailed knowledge on the hygrothermal performance of mechanically attached cool roof system is requested; in consideration to varying surface colors, roof air tightness, climate zones and indoor moisture supply.

Pallin, Simon B [ORNL

2013-01-01T23:59:59.000Z

291

Advances in Measuring Solar Reflectance-or, Why That Roof isn't as Cool  

NLE Websites -- All DOE Office Websites (Extended Search)

Advances in Measuring Solar Reflectance-or, Why That Roof isn't as Cool Advances in Measuring Solar Reflectance-or, Why That Roof isn't as Cool as You Thought it Was Speaker(s): Ronnen Levinson Date: June 30, 2009 - 12:00pm Location: LBNL Bldg. 66 Auditorium Solar reflectance is often used to estimate the solar heat gain and rate the "coolness" of roofs and pavements. A solar reflectance property measured by two popular ASTM standard test methods (E903, C1549) can underestimate the peak solar heat gain of a spectrally selective "cool colored" surface by nearly 100 W m-2 because it assumes that sunlight contains an unrealistically high fraction of near-infrared (invisible) energy. Its use in building energy simulations can overestimate cool-roof annual energy savings by more than 20%. I define a new and simple solar

292

Green Roof Mitigation Potential for a Proxy Future Climate Scenario in Chicago, Illinois  

Science Conference Proceedings (OSTI)

The Advanced Research version of the Weather Research and Forecasting Model (ARW) coupled with an urban canopy model is used to investigate the potential of vegetative (green) roof technology to mitigate against ongoing climate warming and ...

Kathryn R. Smith; Paul J. Roebber

2011-03-01T23:59:59.000Z

293

Procedure for measuring the solar reflectance of flat or curved roofing assemblies  

E-Print Network (OSTI)

effects of cool roofs on California commercial buildings.ASHRAE 2004, 2007). Californias current (year 2005) TitleBuildings. CEC-400-2006-015. California Energy Commission,

Akbari, Hashem

2008-01-01T23:59:59.000Z

294

The Trade-off between Solar Reflectance and Above-Sheathing Ventilation for Metal Roofs on Residential and Commercial Buildings  

Science Conference Proceedings (OSTI)

An alternative to white and cool-color roofs that meets prescriptive requirements for steep-slope (residential and non-residential) and low-slope (non-residential) roofing has been documented. Roofs fitted with an inclined air space above the sheathing (herein termed above-sheathing ventilation, or ASV), performed as well as if not better than high-reflectance, high-emittance roofs fastened directly to the deck. Field measurements demonstrated the benefit of roofs designed with ASV. A computer tool was benchmarked against the field data. Testing and benchmarks were conducted at roofs inclined at 18.34 ; the roof span from soffit to ridge was 18.7 ft (5.7 m). The tool was then exercised to compute the solar reflectance needed by a roof equipped with ASV to exhibit the same annual cooling load as that for a direct-to-deck cool-color roof. A painted metal roof with an air space height of 0.75 in. (0.019 m) and spanning 18.7 ft (5.7 m) up the roof incline of 18.34 needed only a 0.10 solar reflectance to exhibit the same annual cooling load as a direct-to-deck cool-color metal roof (solar reflectance of 0.25). This held for all eight ASHRAE climate zones complying with ASHRAE 90.1 (2007a). A dark heat-absorbing roof fitted with 1.5 in. (0.038 m) air space spanning 18.7 ft (5.7 m) and inclined at 18.34 was shown to have a seasonal cooling load equivalent to that of a conventional direct-to-deck cool-color metal roof. Computations for retrofit application based on ASHRAE 90.1 (1980) showed that ASV air spaces of either 0.75 or 1.5 in. (0.019 and 0.038 m) would permit black roofs to have annual cooling loads equivalent to the direct-to-deck cool roof. Results are encouraging, and a parametric study of roof slope and ASV aspect ratio is needed for developing guidelines applicable to all steep- and low-slope roof applications.

Desjarlais, Andre Omer [ORNL] [ORNL; Kriner, Scott [Metal Construction Association, Glenview, IL] [Metal Construction Association, Glenview, IL; Miller, William A [ORNL] [ORNL

2013-01-01T23:59:59.000Z

295

Evaluation of Vegetative Roofs' Performance on Energy Consumption in Hot and Humid Climates  

E-Print Network (OSTI)

Green roofs have been widely used in Europe proved to be beneficial. However, in the US they are not widespread. Previous studies have concluded that the main obstacle that makes architects, developers, etc. reluctant to introduce vegetative roofs is their preference for the traditional roofing since it is a tried-and-true technology. A positive feedback on the performance of vegetative roofs will encourage developers and possibly government authorities to invest more in them. Therefore, a survey was conducted to determine the performance of green roofs in existing buildings in hot and humid climates. This paper presents the results of this survey of around 40 buildings. The methodology and pertinent questions are also presented. Due to the many parameters involved in determining the rate of energy consumption in a building, a definite conclusion regarding how much exactly they can effect on saving can not be drawn, however, the results showed that green roofs can result in saving in the annual energy consumption and using shrubs as well as increasing soil thickness were found to be most effective in reducing building energy consumption.

Anderson, J.; Azarbayjani, M.

2008-12-01T23:59:59.000Z

296

Thermal Performance of Exposed Composed Roofs in Very Hot Dry Desert Region in Egypt (Toshky)  

E-Print Network (OSTI)

Thermal performance for any building in hot dry region depend on the external climatic factor, the ability of the construction materials used in gained heat through day time and loss this heat through night time through the nocturnal radiation. Roof is considered the major part of the building envelop which exposed to high thermal load due to the high solar intensity and high outdoor air temperature through summer season which reach to 6 months. In Egypt the thermal effect of roof is increased as one go towards from north to south. This study evaluate the thermal performance of different test rooms with different roofs construction; uninsulated concrete, insulated concrete, double, plant, and active concrete roofs, constructed under the effect of external climatic condition of very hot and dry region in Egypt (Toshky region). The external climatic conditions and the temperature distribution inside the roof construction and the indoor air temperature were measured. The results of this study recognized that the thermal transmittance (UValue) has a major role in chosen the constructed materials. Also the thermal insulation considered the suitable manner for damping the thermal stresses through day time and makes the interior environment of the building near the comfort zone during most months of the year. Natural night and forced ventilation are more important in improving the internal conditions. The construction roof systems show that the indoor air temperature thermal damping reach to 96%, 90%, 89%, and 76% for insulated concrete, double, planted and uninsulated concrete roofs. The results also investigate the importance of using the earth as a cooling source through the active concrete system. Evaporative cooling and movable shading which are an integrated part of the guidelines for building design in hot dry region must be using.

Khalil, M. H.; Sheble, S.; Morsey, M. S.; Fakhry, S.

2010-01-01T23:59:59.000Z

297

Condition Assessment Survey (CAS) Program. Deficiency standards and inspections methods manual: Volume 5, 0.05 Roofing  

Science Conference Proceedings (OSTI)

General information is presented for asset determinant factor/CAS repair codes/CAS cost factors; guide sheet tool & material listing; testing methods; inspection frequency; standard system design life tables; and system work breakdown structure. Deficiency standards and inspection methods are presented for built-up membrane; single- ply membrane; metal roofing systems; coated foam membrane; shingles; tiles; parapets; roof drainage system; roof specialties; and skylights.

Not Available

1993-05-01T23:59:59.000Z

298

Effects of temperature and humidity variations on the stability of coal mine roof rocks. Final report  

SciTech Connect

A high degree of correlation between strain developed in samples of roof rock and humidity changes was obtained in the laboratory. The strain developed across bedding planes was greater than strain developed parallel to bedding. In tests conducted underground, strain values were much lower and the data more scattered for similar humidity variations. Roof rock specimens reacted to a 10 pct change in humidity throughout a 7 to 10 day period before stabilizing, which seems to rule out daily humidity cycles as a factor in roof deterioration and indicates seasonal variations as a major cause. Very low annual temperature variations were recorded in active sections of the mine. At a 6 F annual variation developed strain would be only 10.5 microinches per inch, far below the strain magnitude for humidity variations and probably too low to be a factor in problems of roof deterioration. Laboratory strain tests on drill core samples were shown to be indicators of moisture sensitivity of roof rock, but neither chemical nor physical properties of the samples correlated with the strain data. (Portions of this document are not fully legible.)

Haynes, C.D.

1975-06-01T23:59:59.000Z

299

Application of Spray Foam Insulation Under Plywood and OSB Roof Sheathing (Fact Sheet)  

SciTech Connect

Spray polyurethane foams (SPFs) have advantages over alternative insulation methods because they provide air sealing in complex assemblies, particularly roofs. Spray foam can provide the thermal, air, and vapor control layers in both new and retrofit construction. Unvented roof strategies with open cell and closed cell SPF insulation sprayed to the underside of roof sheathing have been used since the mid-1990s to provide durable and efficient building enclosures. However, there have been isolated incidents of failures (either sheathing rot or SPF delamination) that raise some general concerns about the hygrothermal performance and durability of these systems. The primary risks for roof systems are rainwater leaks, condensation from diffusion and air leakage, and built-in construction moisture. This project directly investigated rain and indirectly investigated built-in construction moisture and vapor drives. Research involved both hygrothermal modeling of a range of rain water leakage scenarios and field evaluations of in-service residential roofs. Other variables considered were climate zone, orientation, interior relative humidity, and the vapor permeance of the coating applied to the interior face of open cell SPF.

Not Available

2013-11-01T23:59:59.000Z

300

ENERGY STAR Certified Homes, Version 3 (Rev. 07) Inspection Checklists...  

NLE Websites -- All DOE Office Websites (Extended Search)

surfaces, regardless of slope (e.g., cathedral ceilings, tray ceilings, conditioned attic roof decks, flat ceilings, sloped ceilings), must meet the requirements for ceilings. 11....

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Solar Water Heating: SPECIFICATION, CHECKLIST AND GUIDE  

NLE Websites -- All DOE Office Websites (Extended Search)

to meet the elements of these specifications but are constructing multifamily buildings, flat roof residential structures, or buildings without attic access, or using alternatives...

302

Building Technologies Office: Building Envelope Technologies...  

NLE Websites -- All DOE Office Websites (Extended Search)

energy efficiency. Research in building envelope technologies includes: Foundations Insulation Roofing and Attics Walls Foundations Photo of the concrete foundation of a building...

303

Evaluation of aerial thermography to discriminate loft insulation in residential housing .  

E-Print Network (OSTI)

??This thesis examines the use of aerial thermography data to discriminate loft (attic) insulation levels in residential housing, with ventilated pitched roofs, in the UK. (more)

Allinson, David

2007-01-01T23:59:59.000Z

304

Energy savings estimates and cost benefit calculations for high performance relocatable classrooms  

E-Print Network (OSTI)

Roof) coating for the radiant barrier in the attic space.barrier. Other possible heating systems compatible with the IDEC cooling system, such as electric ceiling radiant

Rainer, Leo I.; Hoeschele, Marc A.; Apte, Michael G.; Shendell, Derek G.; Fisk, William J.

2003-01-01T23:59:59.000Z

305

Regional climate consequences of large-scale cool roof and photovoltaic array deployment  

NLE Websites -- All DOE Office Websites (Extended Search)

climate consequences of large-scale cool roof and photovoltaic array deployment climate consequences of large-scale cool roof and photovoltaic array deployment This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2011 Environ. Res. Lett. 6 034001 (http://iopscience.iop.org/1748-9326/6/3/034001) Download details: IP Address: 98.204.49.123 The article was downloaded on 01/07/2011 at 12:38 Please note that terms and conditions apply. View the table of contents for this issue, or go to the journal homepage for more Home Search Collections Journals About Contact us My IOPscience IOP PUBLISHING ENVIRONMENTAL RESEARCH LETTERS Environ. Res. Lett. 6 (2011) 034001 (9pp) doi:10.1088/1748-9326/6/3/034001 Regional climate consequences of large-scale cool roof and photovoltaic array deployment Dev Millstein and Surabi Menon Lawrence

306

Monitoring the energy-use effects of cool roofs on Californiacommercial buildings  

Science Conference Proceedings (OSTI)

Solar-reflective roofs stay cooler in the sun than solar-absorptive roofs. Such 'cool' roofs achieve lower surface temperatures that reduce heat conduction into the building and the building's cooling load. We monitored the effects of cool roofs on energy use and environmental parameters in six California buildings at three different sites: a retail store in Sacramento; an elementary school in San Marcos (near San Diego); and a four-building cold storage facility in Reedley (near Fresno). The latter included a cold storage building, a conditioning and fruit-palletizing area, a conditioned packing area, and two unconditioned packing areas. Results showed that installing a cool roof reduced the daily peak roof surface temperature of each building by 33-42 K. In the retail store building in Sacramento, for the monitored period of 8 August-30 September 2002, the estimated savings in average air conditioning energy use was about 72 Wh/m{sup 2}/day (52%). On hot days when the afternoon temperature exceeded 38 C, the measured savings in average peak demand for peak hours (noon-5 p.m.) was about 10 W/m{sup 2} of conditioned area. In the school building in San Marcos, for the monitored period of 8 July-20 August 2002, the estimated savings in average air conditioning energy use was about 42-48 Wh/m{sup 2}/day (17-18%). On hot days, when the afternoon temperature exceeded 32 C, the measured savings in average peak demand for hours 10 a.m.-4 p.m. was about 5 W/m{sup 2} of conditioned area. In the cold storage facility in Reedley, for the monitored period of 11 July-14 September 2002, and 11 July-18 August 2003, the estimated savings in average chiller energy use was about 57-81 Wh/m{sup 2}/day (3-4%). On hot days when the afternoon temperature exceeded 38 C, the measured savings in average peak-period demand (average cooling-power demand during peak demand hours, typically noon-6 p.m.) was about 5-6 W/m{sup 2} of conditioned area. Using the measured data and calibrated simulations, we estimated savings for similar buildings installing cool roofs in retrofit applications for all 16 California climate zones. For similar retail stores in climate zones 2 and 4-16, installing a cool roof can save about 6-15 kWh/m{sup 2}/year of conditioned area. In climate zones 2-16, estimates of average peak demand savings for hours noon-5 p.m. range from 2.9 to 5.8 W/m{sup 2}. For similar school buildings in climate zones 2-16, installing a cool roof can save from 3 to 6 kWh/m{sup 2}/year of conditioned roof area. For all 16 climate zones estimates of average peak demand savings for hours noon-5 p.m. range from 2.6 to 3.8 W/m{sup 2}. In similar cold storage buildings in all 16 climate zones, installing a cool roof can save about 4.5-7.4 kWh/m{sup 2}/year of conditioned roof area. In all 16 climate zones, estimates of average peak demand savings for hours noon-5 p.m. range from 3.9 to 6.6 W/m{sup 2}.

Akbari, Hashem; Levinson, Ronnen; Rainer, Leo

2004-07-14T23:59:59.000Z

307

SOLAR RADIATION ESTIMATION ON BUILDING ROOFS AND WEB-BASED SOLAR CADASTRE  

E-Print Network (OSTI)

The aim of this study is the estimation of solar irradiance on building roofs in complex Alpine landscapes. Very high resolution geometric models of the building roofs are generated by means of advanced automated image matching methods. Models are combined with raster and vector data sources to estimate the incoming solar radiation hitting the roofs. The methodology takes into account for atmospheric effects, site latitude and elevation, slope and aspect of the terrain as well as the effects of shadows cast by surrounding buildings, chimneys, dormers, vegetation and terrain topography. An open source software solution has been developed and applied to a study area located in a mountainous site and containing some 1250 residential, commercial and industrial buildings. The method has been validated by data collected with a pyranometer and results made available through a prototype WebGIS platform. 1.

G. Agugiaro A; Commission Ii Wg

2012-01-01T23:59:59.000Z

308

Radical Thinkers Needed to Help Get a Solar Panel on Every Roof |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Radical Thinkers Needed to Help Get a Solar Panel on Every Roof Radical Thinkers Needed to Help Get a Solar Panel on Every Roof Radical Thinkers Needed to Help Get a Solar Panel on Every Roof January 9, 2012 - 5:00pm Addthis This solar powered residence was commissioned by Boston Edison as a demonstration of future trends in design and technology that would become commonplace in the early decades of the next millennium. Today, the Energy Department's SunShot Initiative is seeking to accelerate innovation and aggressively drive down cost through various funding opportunities. | Photo courtesy of Solar Design Associates. This solar powered residence was commissioned by Boston Edison as a demonstration of future trends in design and technology that would become commonplace in the early decades of the next millennium. Today, the Energy

309

WIPP supplementary roof support system Room 1, Panel 1: Geotechnical field data analysis report  

SciTech Connect

The design of the Room 1, Panel 1, supplementary roof support system was finalized in September 1991, and the system successfully installed in the test bin area between the bulkheads by December 1991. Simultaneously with the support system installation, existing monitoring system was upgraded to meet the needs of the installed roof support. This included extensometers, closure stations, rockbolt load cells as well as survey measurements of roof sag and floor lift. A Project Control Group (PCG) was established in order to monitor room and support system performance. Weekly meetings of the PCG were held to review all monitored data against criteria set in the initial design, and to modify these where necessary. Records of these meetings have been kept, with copies of all data summaries and action notes. These data records are maintained in the Engineering data files. After more than ten months of monitoring and reviewing experience, several modifications have been made both to the way data has been reported as well as to the load adjustment criteria. The support system has performed as expected in the design, with no signs of instability developing considering the rates of roof deformation, the rock bolt loads and the observed fracture behavior in the roof. This is particularly true of the horizon in which the rockbolt anchors are located, the most critical part of the design. The distribution of load build-up, throughout the 286 rockbolt load cells installed, in the Room 1 has been found satisfactory, and the load increases as evaluated by the PCG on a weekly basis have been within the acceptable range. The minimum life of the installed support system is estimated at 15 years based on the highest roof expansion rate experienced to date. This report provides analysis of geotechnical field data collected up to December 1992.

1993-03-01T23:59:59.000Z

310

Impact of Reflective Roofing on Cooling Electrical Use and Peak Demand in a Florida Retail Mall  

E-Print Network (OSTI)

Architects in hot climates have long recognized that reflective roof colors can reduce building cooling load. Experimentation spanning nearly three decades has shown that white roofing surfaces can significantly reduce surface temperatures and cooling loads (Givoni and Hoffmann, 1968; Reagan and Acklam, 1979; Griggs and Shipp, 1988; Anderson, 1989; Anderson et al., 1991 and Bansal et al., 1992). More importantly, measured cooling energy savings of white surfaces have been significant in California's climate (Akbari et al., 1991, 1992, 1997). In Florida, field research by the Florida Solar Energy Center (FSEC) since 1993 has quantified the impact of reflective roof coatings on sub-metered air conditioning (AC) consumption in tests in a dozen occupied homes (Parker et al., 1993; 1994; 1995; 1997). The coatings were applied to the roofs of each home in mid-summer after a month-long period of monitoring during which meteorological conditions, building temperatures and AC energy use were recorded. Using weather periods with similar temperatures and solar insolation, air conditioning energy use was reduced by 10% - 43% in the homes. The average drop in space cooling energy use was about 7.4 kWh/day or 19% of the pre-application air conditioning consumption. Unfortunately, until this project there has been little objective testing of the impact of roof whitening on the AC load of commercial buildings in Florida. Two demonstration sites have been monitored. The first was an elementary school in Cocoa Beach, Florida, which was monitored for a year before and after a white roof coating was applied. A final report on this project was published in the CADDET Newsletter (Parker et al., 1996a, b). The project demonstrated a 10% annual savings in chiller energy with a 30% reduction in peak cooling electrical demand. This paper summarizes the findings from the second demonstration at a commercial strip mall.

Parker, D. S.; Sonne, J. K.; Sherwin, J. R.

2002-01-01T23:59:59.000Z

311

Instability leading to coal bumps and nonlinear evolutionary mechanisms for a coal-pillar-and-roof system  

E-Print Network (OSTI)

Instability leading to coal bumps and nonlinear evolutionary mechanisms for a coal mechanisms of the mechanical system that is composed of the stiff hosts (roof and floor) and the coal pillar using catastrophe theory. It is assumed that the roof is an elastic beam and the coal pillar is a strain

Jiao, Jiu Jimmy

312

Using Cool Roofs to Reduce Energy Use, Greenhouse Gas Emissions, and Urban Heat-island Effects: Findings from an India Experiment  

E-Print Network (OSTI)

program in Mexico City, and contacts in energy efficiencyenergy savings due to cool roofs for the median climate in Brazil, India, and Mexico ..energy savings due to cool roofs for the median climate in Brazil, India, and Mexico

Akbari, Hashem

2011-01-01T23:59:59.000Z

313

Moisture studies of a self-drying roof: Tests in the large scale climate simulator and results from thermal and hygric models  

Science Conference Proceedings (OSTI)

Simultaneous experiments on the moisture behavior of six low-slope roof systems were performed in a climate simulator. The systems comprised a self-drying design over a conventional metal deck, a self-drying design over a significantly more permeable slotted metal deck and four others over conventional metal decks: a system typical of US construction with a liquid water permeable vapor retarder, a system typical of European construction with a liquid water permeable vapor retarder, a top-ventilated system with a polyethylene vapor retarder, and an impermeable control system with a polyethylene vapor retarder. Total weight of each test panel was measured and recorded continuously, along with temperatures and heat fluxes, to compare the behavior of the various systems. The authors imposed steady-state temperatures from hot summer to cold winter conditions to obtain the R-values of the construction dry insulations in each panel. Temperature cycles typical of hot summer days and mild winter days were then imposed above the construction dry assemblies to obtain baseline diurnal performance. The authors applied a one-dimensional thermal and hygric model. The solid and slotted deck were assumed to differ only in water vapor permeance. A model was not attempted for the top-ventilated system. The 1-D model predicted very well the slow rates of wetting in the winter cycles and both the slow then fast rates of drying in the summer cycles before and after water addition, except it overpredicted the drying rate for the US construction with a liquid water permeable vapor retarder.

Desjarlais, A.O.; Petrie, T.W.; Childs, P.W.; Atchley, J.A.

1998-08-01T23:59:59.000Z

314

A SIMULATION MODEL FOR THE PERFORMANCE ANALYSIS OF ROOF POND SYSTEMS FOR HEATING AND COOLING  

E-Print Network (OSTI)

Tex. , 3rd Ann. Solar Heating & Cooling R&D Contractors'Proceedings, Passive Solar Heating & Cooling~'-~&-l~orkshop,Solar Jubilee, Phoenix, AZ, June 2-6, 1980 A SIMULATION MODEL FOR THE PERFORMANCE ANALYSIS OF ROOF POND SYSTEMS FOR HEATING

Tavana, Medhi

2011-01-01T23:59:59.000Z

315

Studies of Photovoltaic Roofing Systems at Wind Engineering and Fluids Laboratory at Colorado State University  

E-Print Network (OSTI)

Studies of Photovoltaic Roofing Systems at Wind Engineering and Fluids Laboratory at Colorado State of photovoltaic technology to generate electricity. Various innovative systems incorporating photovoltaic panels and Fluids Laboratory (WEFL) at Colorado State University (CSU, www.windlab.colostate.edu) have been involved

316

Laying the Foundation for a Solar America: The Million Solar Roofs Initiative  

DOE Green Energy (OSTI)

As the U.S. Department of Energy's Solar Energy Technology Program embarks on the next phase of its technology acceptance efforts under the Solar America Initiative, there is merit to examining the program's previous market transformation effort, the Million Solar Roofs Initiative. Its goal was to transform markets for distributed solar technologies by facilitating the installation of solar systems.

Strahs, G.; Tombari, C.

2006-10-01T23:59:59.000Z

317

GPU-based roofs' solar potential estimation using LiDAR data  

Science Conference Proceedings (OSTI)

Solar potential estimation using LiDAR data is an efficient approach for finding suitable roofs for photovoltaic systems' installations. As the amount of LiDAR data increases, the non-parallel methods take considerable time to accurately estimate the ... Keywords: CUDA, GPU, LiDAR, Solar potential

Niko Luka?, Borut Alik

2013-03-01T23:59:59.000Z

318

Regional climate consequences of large-scale cool roof and photovoltaic  

NLE Websites -- All DOE Office Websites (Extended Search)

climate consequences of large-scale cool roof and photovoltaic climate consequences of large-scale cool roof and photovoltaic array deployment Title Regional climate consequences of large-scale cool roof and photovoltaic array deployment Publication Type Journal Article Year of Publication 2011 Authors Millstein, Dev, and Surabi Menon Journal Environmental Research Letters Volume 6 Start Page 1 Pagination 9 Date Published 07/2011 Keywords co2 offsets, cool roofs, photovoltaics, radiative forcing, urban environment Abstract Modifications to the surface albedo through the deployment of cool roofs and pavements (reflective materials) and photovoltaic arrays (low reflection) have the potential to change radiative forcing, surface temperatures, and regional weather patterns. In this work we investigate the regional climate and radiative effects of modifying surface albedo to mimic massive deployment of cool surfaces (roofs and pavements) and, separately, photovoltaic arrays across the United States. We use a fully coupled regional climate model, the Weather Research and Forecasting (WRF) model, to investigate feedbacks between surface albedo changes, surface temperature, precipitation and average cloud cover. With the adoption of cool roofs and pavements, domain-wide annual average outgoing radiation increased by 0.16 ± 0.03 W m-2 (mean ± 95% C.I.) and afternoon summertime temperature in urban locations was reduced by 0.11-0.53 "C, although some urban areas showed no statistically significant temperature changes. In response to increased urban albedo, some rural locations showed summer afternoon temperature increases of up to +0.27 "C and these regions were correlated with less cloud cover and lower precipitation. The emissions offset obtained by this increase in outgoing radiation is calculated to be 3.3 ± 0.5 Gt CO2 (mean ± 95% C.I.). The hypothetical solar arrays were designed to be able to produce one terawatt of peak energy and were located in the Mojave Desert of California. To simulate the arrays, the desert surface albedo was darkened, causing local afternoon temperature increases of up to +0.4 "C. Due to the solar arrays, local and regional wind patterns within a 300 km radius were affected. Statistically significant but lower magnitude changes to temperature and radiation could be seen across the domain due to the introduction of the solar arrays. The addition of photovoltaic arrays caused no significant change to summertime outgoing radiation when averaged over the full domain, as interannual variation across the continent obscured more consistent local forcing.

319

Regional climate consequences of large-scale cool roof and photovoltaic  

NLE Websites -- All DOE Office Websites (Extended Search)

climate consequences of large-scale cool roof and photovoltaic climate consequences of large-scale cool roof and photovoltaic array deployment Title Regional climate consequences of large-scale cool roof and photovoltaic array deployment Publication Type Journal Article Year of Publication 2011 Authors Millstein, Dev, and Surabi Menon Journal Environmental Research Letters Volume 6 Start Page 1 Pagination 9 Date Published 07/2011 Keywords co2 offsets, cool roof, photovoltaics, radiative forcing, urban environment Abstract Modifications to the surface albedo through the deployment of cool roofs and pavements (reflective materials) and photovoltaic arrays (low reflection) have the potential to change radiative forcing, surface temperatures, and regional weather patterns. In this work we investigate the regional climate and radiative effects of modifying surface albedo to mimic massive deployment of cool surfaces (roofs and pavements) and, separately, photovoltaic arrays across the United States. We use a fully coupled regional climate model, the Weather Research and Forecasting (WRF) model, to investigate feedbacks between surface albedo changes, surface temperature, precipitation and average cloud cover. With the adoption of cool roofs and pavements, domain-wide annual average outgoing radiation increased by 0.16 ± 0.03 W m-2 (mean ± 95% C.I.) and afternoon summertime temperature in urban locations was reduced by 0.11-0.53 "C, although some urban areas showed no statistically significant temperature changes. In response to increased urban albedo, some rural locations showed summer afternoon temperature increases of up to +0.27 "C and these regions were correlated with less cloud cover and lower precipitation. The emissions offset obtained by this increase in outgoing radiation is calculated to be 3.3 ± 0.5 Gt CO2 (mean ± 95% C.I.). The hypothetical solar arrays were designed to be able to produce one terawatt of peak energy and were located in the Mojave Desert of California. To simulate the arrays, the desert surface albedo was darkened, causing local afternoon temperature increases of up to +0.4 "C. Due to the solar arrays, local and regional wind patterns within a 300 km radius were affected. Statistically significant but lower magnitude changes to temperature and radiation could be seen across the domain due to the introduction of the solar arrays. The addition of photovoltaic arrays caused no significant change to summertime outgoing radiation when averaged over the full domain, as interannual variation across the continent obscured more consistent local forcing.

320

MidAmerican Energy (Gas) - Commercial EnergyAdvantage Rebate Program |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Commercial EnergyAdvantage Rebate Commercial EnergyAdvantage Rebate Program MidAmerican Energy (Gas) - Commercial EnergyAdvantage Rebate Program < Back Eligibility Agricultural Commercial Construction Industrial Institutional Nonprofit Schools Savings Category Heating & Cooling Commercial Heating & Cooling Heating Home Weatherization Commercial Weatherization Cooling Other Construction Manufacturing Appliances & Electronics Water Heating Program Info State South Dakota Program Type Utility Rebate Program Rebate Amount Attic/Roof/Ceiling Insulation: $0.015 x R-value increase x sq. ft. Wall Insulation: $0.01 x R-value increase x sq. ft. Furnaces: $250-$400 Fan Motors for Furnaces: $50 Boilers: $150-$400 or ($0.80+($0.20 x TE) x MBtuh Water Heaters: $75 or ($0.80+($0.20 x TE) x MBtuh Programmable Thermostats: $25

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

MidAmerican Energy (Gas) - Commercial EnergyAdvantage Rebate Program |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

MidAmerican Energy (Gas) - Commercial EnergyAdvantage Rebate MidAmerican Energy (Gas) - Commercial EnergyAdvantage Rebate Program MidAmerican Energy (Gas) - Commercial EnergyAdvantage Rebate Program < Back Eligibility Agricultural Commercial Construction Industrial Institutional Nonprofit Schools Savings Category Heating & Cooling Commercial Heating & Cooling Heating Home Weatherization Commercial Weatherization Cooling Other Construction Manufacturing Appliances & Electronics Water Heating Maximum Rebate Insulation: 70% of cost Program Info State Illinois Program Type Utility Rebate Program Rebate Amount Furnaces: $250-$350 Boilers: $100-$400 Water Heaters: $50 Programmable Thermostats: $20 Cooking Equipment: Varies widely Attic/Roof/Ceiling Insulation: $0.015/R-value increase per sq. ft. Sidewall Insulation: $0.01/R-value increase per sq. ft.

322

Global Cooling: Policies to Cool the World and Offset Global Warming from CO2 Using Reflective Roofs and Pavements  

Science Conference Proceedings (OSTI)

Increasing the solar reflectance of the urban surface reduce its solar heat gain, lowers its temperatures, and decreases its outflow of thermal infrared radiation into the atmosphere. This process of 'negative radiative forcing' can help counter the effects of global warming. In addition, cool roofs reduce cooling-energy use in air conditioned buildings and increase comfort in unconditioned buildings; and cool roofs and cool pavements mitigate summer urban heat islands, improving outdoor air quality and comfort. Installing cool roofs and cool pavements in cities worldwide is a compelling win-win-win activity that can be undertaken immediately, outside of international negotiations to cap CO{sub 2} emissions. We propose an international campaign to use solar reflective materials when roofs and pavements are built or resurfaced in temperate and tropical regions.

Akbari, Hashem; Levinson, Ronnen; Rosenfeld, Arthur; Elliot, Matthew

2009-08-28T23:59:59.000Z

323

Neural Network Based on Ant Colony Clustering Algorithm Applied to Predict the Stability of the Roof in Coal Mining  

Science Conference Proceedings (OSTI)

The colliery roof collapse accident is one of the mine disasters .The influence factors have the characteristic of variety, non-linear, incertitude, etc., which make traditional neural prediction have to process a large amount of convoluted data. This ...

Xiaoyue Liu; Jiping Sun; Sumin Feng

2006-10-01T23:59:59.000Z

324

Performance of 3-Sun Mirror Modules on Sun Tracking Carousels on Flat Roof Buildings  

Science Conference Proceedings (OSTI)

Commercial buildings represent a near term market for cost competitive solar electric power provided installation costs and solar photovoltaic module costs can be reduced. JX Crystals has developed a carousel sun tracker that is prefabricated and can easily be deployed on building flat roof tops without roof penetration. JX Crystals is also developing 3-sun PV mirror modules where less expensive mirrors are substituted for two-thirds of the expensive single crystal silicon solar cell surface area. Carousels each with four 3-sun modules have been set up at two sites, specifically at Oak Ridge National Lab and at the University of Nevada in Las Vegas. The test results for these systems are presented.

Fraas, Dr. Lewis [JX Crystals, Inc.; Avery, James E. [JX Crystals, Inc.; Minkin, Leonid M [ORNL; Maxey, L Curt [ORNL; Gehl, Anthony C [ORNL; Hurt, Rick A [ORNL; Boehm, Robert F [ORNL

2008-01-01T23:59:59.000Z

325

Barrel-shaped solar roofing element and method for its assembly  

Science Conference Proceedings (OSTI)

This patent describes a solar roofing system. It comprises a set of shingle comprising lower and upper flat plastic sheet members of extruded plastic spaced apart and sealed together to form fluid flow paths forming solar energy conversion means, the upper sheet of which is transparent to solar energy, interconnecting and overlapping structure for joining shingles together including structure for nailing through overlapped shingles into a roof surface, and means for interconnecting the solar energy conversion means comprising a flow path between the lower and upper plastic sheets for circulation of a liquid that may store heat when subjected to solar energy from a plurality of the shingles into a network for collecting accumulated solar energy.

Allegro, J.

1991-06-11T23:59:59.000Z

326

Laying the Foundation for a Solar America: The Million Solar Roofs Initiative  

SciTech Connect

As the U.S. Department of Energy's Solar Energy Technology Program embarks on the next phase of its technology acceptance efforts under the Solar America Initiative, there is merit to examining the program's previous market transformation effort, the Million Solar Roofs Initiative. Its goal was to transform markets for distributed solar technologies by facilitating the installation of solar systems.

Strahs, G.; Tombari, C.

2006-10-01T23:59:59.000Z

327

Predicting Current Serviceability And Residual Service Life Of Plywood Roof Sheathing Using  

E-Print Network (OSTI)

This report presents the findings and implications of a 10-year research program, carried out at the USDA Forest Service, Forest Products Laboratory, to develop kinetics-based service-life models for untreated and fire-retardant- (FR) treated plywood roof sheathing exposed to elevated in-service temperatures. This program was initiated because some FR-treated sheathing products were experiencing significant thermal degrade and needed to be replaced. This 10-year research program systematically identified the cause of the degradation and has resulted in new acceptance and performance standards and revisions to U.S. building codes. The strength loss was cumulatively related to FR chemistry, thermal exposure during pretreatment, treatment, and post-treatment processing, and in-service exposure. Quantitatively, a kinetics-based approach could be used to predict strength loss of plywood based on its time-- temperature exposure history. The research program then developed models to assess current condition, predict future hazard based on past service life, and predict residual serviceability of untreated and FR-treated plywood used as structural roof sheathing. Findings for each of these subjects are briefly described in this report. Results of research programs like this one can be used to extend the service life of wood by providing engineers with an estimate of residual serviceability and thereby avoiding premature removal. Many of the approaches in these kinetics-based servicelife models for plywood roof sheathing are directly applicable to the development of predictive durability models for wood and wood composite roof and wall sheathing that has been exposed to moisture and has eventually decayed. When those models are developed, they will help building code officials, ...

Kinetics-Based Models Je; Je Win; Y Pk Lebow; Jf Murphy; Usda Forest; Service Madison; Wisconsin Usa

2002-01-01T23:59:59.000Z

328

Cooling energy savings potential of light-colored roofs for residential and commercial buildings in 11 US metropolitan areas  

SciTech Connect

The U.S. Environmental Protection Agency (EPA) sponsored this project to estimate potential energy and monetary savings resulting from the implementation of light-colored roofs on residential and commercial buildings in major U.S. metropolitan areas. Light-colored roofs reflect more sunlight than dark roofs, so they keep buildings cooler and reduce air-conditioning demand. Typically, rooftops in the United States are dark, and thus there is a potential for saving energy and money by changing to reflective roofs. Naturally, the expected savings are higher in southern, sunny, and cloudless climates. In this study, we make quantitative estimates of reduction in peak power demand and annual cooling electricity use that would result from increasing the reflectivity of the roofs. Since light-colored roofs also reflect heat in the winter, the estimates of annual electricity savings are a net value corrected for the increased wintertime energy use. Savings estimates only include direct reduction in building energy use and do not account for the indirect benefit that would also occur from the reduction in ambient temperature, i.e. a reduction in the heat island effect. This analysis is based on simulations of building energy use, using the DOE-2 building energy simulation program. Our methodology starts with specifying 11 prototypical buildings: single-family residential (old and new), office (old and new), retail store (old and new), school (primary and secondary), health (hospital and nursing home), and grocery store. Most prototypes are simulated with two heating systems: gas furnace and heat pumps. We then perform DOE-2 simulations of the prototypical buildings, with light and dark roofs, in a variety of climates and obtain estimates of the energy use for air conditioning and heating.

Konopacki, S.; Akbari, H.; Gartland, L. [and others

1997-05-01T23:59:59.000Z

329

A novel technique for the production of cool colored concrete tile and asphalt shingle roofing products  

SciTech Connect

The widespread use of solar-reflective roofing materials can save energy, mitigate urban heat islands and slow global warming by cooling the roughly 20% of the urban surface that is roofed. In this study we created prototype solar-reflective nonwhite concrete tile and asphalt shingle roofing materials using a two-layer spray coating process intended to maximize both solar reflectance and factory-line throughput. Each layer is a thin, quick-drying, pigmented latex paint based on either acrylic or a poly(vinylidene fluoride)/acrylic blend. The first layer is a titanium dioxide rutile white basecoat that increases the solar reflectance of a gray-cement concrete tile from 0.18 to 0.79, and that of a shingle surfaced with bare granules from 0.06 to 0.62. The second layer is a 'cool' color topcoat with weak near-infrared (NIR) absorption and/or strong NIR backscattering. Each layer dries within seconds, potentially allowing a factory line to pass first under the white spray, then under the color spray. We combined a white basecoat with monocolor topcoats in various shades of red, brown, green and blue to prepare 24 cool color prototype tiles and 24 cool color prototypes shingles. The solar reflectances of the tiles ranged from 0.26 (dark brown; CIELAB lightness value L* = 29) to 0.57 (light green; L* = 76); those of the shingles ranged from 0.18 (dark brown; L* = 26) to 0.34 (light green; L* = 68). Over half of the tiles had a solar reflectance of at least 0.40, and over half of the shingles had a solar reflectance of at least 0.25.

Levinson, Ronnen; Akbari, Hashem; Berdahl, Paul; Wood, Kurt; Skilton, Wayne; Petersheim, Jerry

2009-11-20T23:59:59.000Z

330

Three-dimensional analysis of AP600 standard plant shield building roof  

SciTech Connect

The AP600 passive containment vessel is surrounded by a concrete cylindrical shell covered with a truncated conical roof. This roof supports the passive containment cooling system (PCS) annular tank, shield plate and other nonstructural attachments. When the shield building is subjected to different loading combinations as defined in the Standard Review Plan (SRP), some of the sections in the shield building could experience forces in excess of their design values. This report summarized the three-dimensional finite element analysis that was conducted to review the adequacy of the proposed Westinghouse shield building design. The ANSYS finite element software was utilized to analyze the Shield Building Roof (SBR) under dead, snow, wind, thermal and seismic loadings. A three-dimensional model that included a portion of the shield building cylindrical shell, the conical roof and its attachments, the eccentricities at the cone-cylinder connection and at the compression ring and the PCS tank was developed. Mesh sensitivity studies were conducted to select appropriate element size in the cylinder, cone, near air intakes and in the vicinity of the eccentricities. Also, a study was carried out to correctly idealize the water-structure interaction in the PCS tank. Response spectrum analysis was used to calculate the internal forces at different sections in the SBR under Safe Shutdown Earthquake (SSE). Forty-nine structural modes and twenty sloshing modes were used. Two horizontal components of the SSE together with a vertical component were used. Modal stress resultants were combined taking into account the effects of closely spaced modes. The three earthquake directions were combined by the Square Root of the Sum Squares method. Two load combinations were studied. The load combination that included dead, snow, fluid, thermal and seismic loads was selected to be the most critical. Interaction diagrams for critical sections were developed and used to check the design adequacy. The results demonstrated that provided area of steal on each face of several sections of the AP600 SBR was inadequate. This was also noticed when comparing the total provided area of steel per section, i.e., the area of steel on both faces. The discrepancy between Westinghouse results and these reported herein could have resulted from the different finite element mesh sizes and the assumption used in Westinghouse design.

Greimann, L.; Fanous, F.; Safar, S.; Khalil, A.; Bluhm, D.

1999-06-01T23:59:59.000Z

331

Project Overcoat - An Exploration of Exterior Insulation Strategies for 1-1/2-Story Roof Applications in Cold Climates  

SciTech Connect

The development of an alternative method to interior-applied insulation strategies or exterior applied 'band-aids' such as heat tapes and ice belts may help reduce energy needs of millions of 1-1/2 story homes while reducing the risk of ice dam formation. A potential strategy for energy improvement of the roof is borrowed from new construction best practices: Here an 'overcoat' of a continuous air, moisture, and thermal barrier is applied on the outside of the roof structure for improved overall performance. The continuous insulation of this approach facilitates a reduction in thermal bridging which could further reduce energy consumption and bring existing homes closer to meeting the Building America goals for energy reduction. Research favors an exterior approach to deep energy retrofits and ice dam prevention in existing homes. The greatest amount of research focuses on whole house deep energy retrofits leaving a void in roof-only applications. The research is also void of data supporting the hygrothermal performance, durability, constructability, and cost of roof-only exterior overcoat strategies. Yet, contractors interviewed for this report indicate an understanding that exterior approaches are most promising for mitigating ice dams and energy loss and are able to sell these strategies to homeowners.

Ojczyk, C.; Mosiman, G.; Huelman, P.; Schirber, T.; Yost, P.; Murry, T.

2013-04-01T23:59:59.000Z

332

Roof-top solar energy potential under performance-based building energy codes: The case of Spain  

Science Conference Proceedings (OSTI)

The quantification at regional level of the amount of energy (for thermal uses and for electricity) that can be generated by using solar systems in buildings is hindered by the availability of data for roof area estimation. In this note, we build on an existing geo-referenced method for determining available roof area for solar facilities in Spain to produce a quantitative picture of the likely limits of roof-top solar energy. The installation of solar hot water systems (SHWS) and photovoltaic systems (PV) is considered. After satisfying up to 70% (if possible) of the service hot water demand in every municipality, PV systems are installed in the remaining roof area. Results show that, applying this performance-based criterion, SHWS would contribute up to 1662 ktoe/y of primary energy (or 68.5% of the total thermal-energy demand for service hot water), while PV systems would provide 10 T W h/y of electricity (or 4.0% of the total electricity demand). (author)

Izquierdo, Salvador; Montanes, Carlos; Dopazo, Cesar; Fueyo, Norberto [Fluid Mechanics Group, University of Zaragoza and LITEC (CSIC), Maria de Luna 3, 50018 Zaragoza (Spain)

2011-01-15T23:59:59.000Z

333

Measured energy savings and demand reduction from a reflective roof membrane on a large retail store in Austin  

SciTech Connect

In this study, we measured and documented summertime air-conditioning (a/c) daily energy savings and demand reduction from a reflective roof membrane retrofit on a large retail store in Austin, Texas. The original black rubber membrane was replaced with white thermoplastic resulting in a decrease in the average maximum roof surface temperature from 168 degrees F (76 degrees C) to 126 degrees F (52 degrees C). This building, with 100,000ft2 (9300m2) of roof area, yielded 3.6Wh/ft2 (39Wh/m2) in a/c average daily energy savings and 0.35W/ft2 (3.8W/m2) in average reduced demand. Total a/c annual abated energy and demand expenditures were estimated to be $7200 or $0.072/ft2 ($0.77/m2). Based on cost data provided by the building manager, the payback is instantaneous with negligible incremental combined labor and material costs. The estimated present value of future abated expenditures ranged from $62,000 to $71,000 over the baseline 13-year service life of the roof membrane.

Konopacki, Steven J.; Akbari, Hashem

2001-06-25T23:59:59.000Z

334

Numerical evaluation of convex-roof entanglement measures with applications to spin rings  

SciTech Connect

We present two ready-to-use numerical algorithms to evaluate convex-roof extensions of arbitrary pure-state entanglement monotones. Their implementation leaves the user merely with the task of calculating derivatives of the respective pure-state measure. We provide numerical tests of the algorithms and demonstrate their good convergence properties. We further employ them in order to investigate the entanglement in particular few-spins systems at finite temperature. Namely, we consider ferromagnetic Heisenberg exchange-coupled spin-(1/2) rings subject to an inhomogeneous in-plane field geometry obeying full rotational symmetry around the axis perpendicular to the ring through its center. We demonstrate that highly entangled states can be obtained in these systems at sufficiently low temperatures and by tuning the strength of a magnetic field configuration to an optimal value which is identified numerically.

Roethlisberger, Beat; Lehmann, Joerg; Loss, Daniel [Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel (Switzerland)

2009-10-15T23:59:59.000Z

335

Roof shading and wall glazing techniques for reducing peak building heating and cooling loads. Final report  

SciTech Connect

The roof shading device proved to be effective in reducing peak building cooling loads under both actual testing conditions and in selected computer simulations. The magnitude of cooling load reductions varied from case to case depending on individual circumstances. Key variables that had significant impacts on its thermal performance were the number of months of use annually, the thermal characteristics of the roof construction, hours of building use, and internal gains. Key variables that had significant impacts upon economic performance were the costs of fuel energy for heating and cooling, and heating and cooling equipment efficiency. In general, the more sensitive the building is to climate, the more effective the shading device will be. In the example case, the annual fuel savings ($.05 psf) were 6 to 10% of the estimated installation costs ($.50 to .75 psf). The Trombe wall installation at Roxborough High School proved to be effective in collecting and delivering significant amounts of solar heat energy. It was also effective in conserving heat energy by replacing obsolete windows which leaked large amounts of heat from the building. Cost values were computed for both solar energy contributions and for heat loss reductions by window replacement. Together they amount to an estimated three hundred and ninety dollars ($390.00) per year in equivalent electric fuel costs. When these savings are compared with installation cost figures it is apparent that the Trombe wall installation as designed and installed presents a potentially cost-effective method of saving fuel costs. The study results indicate that improved Trombe wall efficiency can be achieved by making design and construction changes to reduce or eliminate outside air leakage into the system and provide automatic fan control.

Ueland, M.

1981-08-01T23:59:59.000Z

336

Effects of Soiling and Cleaning on the Reflectance and Solar HeatGain of a Light-Colored Roofing Membrane  

Science Conference Proceedings (OSTI)

A roof with high solar reflectance and high thermalemittance (e.g., a white roof) stays coolin the sun, reducing coolingpower demand in a conditioned building and increasing comfort in anunconditioned building. The high initial solar reflectance of a whitemembrane roof (circa 0.8) can be degraded by deposition of soot, dust,and/or algae to about 0.6 (range 0.3 to 0.8, depending on exposure) Weinvestigate the effects of soiling and cleaning on the solar spectralreflectance and solar absorptance of 15 initially white or light-graymembrane samples taken from roofs across the United States. Soot andorganic carbon were the two identifiable strongly absorbing contaminantson the membranes. Wiping was effective at removing soot, and less so atremoving organic carbon. Rinsing and/or washing removed nearly all of theremaining soil layer, with the exceptions of (a) thin layers of organiccarbon and (b) isolated dark spots of algae. Bleach was required toremove the last two features. The ratio of solar reflectance to unsoiledsolar reflectance (a measure of cleanliness) ranged from 0.41 to 0.89 forthe soiled samples; 0.53to 0.95 for the wiped samples; 0.74 to 0.98 forthe rinsed samples; 0.79 to 1.00 for the washed samples; and 0.94 to 1.02for the bleached samples. However, the influence of membrane soiling andcleaning on roof heat gain is better gauged by variations in solarabsorptance. Relative solar absorptances (indicating solar heat gainrelative to that of the unsoiled membrane) ranged from 1.4 to 3.5 for thesoiled samples; 1.1 to 3.1 for the wiped samples; 1.0 to 2.0 for therinsed samples; 1.0 to 1.9 for the washed samples; and 0.9 to 1.3 for thebleached samples.

Levinson, Ronnen; Berdahl, Paul; Berhe, Asmeret Asefaw; Akbari,Hashem

2005-04-12T23:59:59.000Z

337

Application of Spray Foam Insulation Under Plywood and OSB Roof Sheathing (Fact Sheet), Building America Case Study: Technology Solutions for New and Existing Homes, Building Technologies Office (BTO)  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Application of Spray Foam Application of Spray Foam Insulation Under Plywood and OSB Roof Sheathing PROJECT aPPliCaTiON Construction: Existing homes with unvented cathedralized roofs. Type: Residential Climate Zones: All TEam mEmbERs Building Science Corporation www.buildingscience.com BASF www.basf.com Dow Chemical Company www.dow.com Honeywell http://honeywell.com Icynene www.icynene.com COdE COmPliaNCE 2012 International Code Council, International Residential Code Spray polyurethane foams (SPFs) have advantages over alternative insulation methods because they provide air sealing in complex assemblies, particularly roofs. Spray foam can provide the thermal, air, and vapor control layers in both new and retrofit construction. Unvented roof strategies with open cell and

338

DYNAMIC THERMALLY-DISCONNECTED BUILDING ENVELOPES A NEW PARADIGM FOR WALLS AND ROOFS IN LOW ENERGY BUILDINGS  

Science Conference Proceedings (OSTI)

This paper describes numerical and experimental analysis of a novel design concept. Traditionally the thermal design of building envelope assemblies is based on a static energy flow. However, building envelopes are subject to varying environmental conditions. This mismatch between the steady-state principles used in the design of roofs and walls and their dynamic operation results in relatively low thermal efficiency. Design work in support of the development of zero energy houses showed that conventional insulations may not be the most cost effective energy solution. Testing conducted on several strategies to thermally-disconnect wall and roof components showed 70% to 90% reductions in peak hour loads as compared to conventional building practice.

Miller, William A [ORNL; Kosny, Jan [ORNL; Zaltash, Abdolreza [ORNL

2010-01-01T23:59:59.000Z

339

Using Cool Roofs to Reduce Energy Use, Greenhouse Gas Emissions, and Urban Heat-island Effects: Findings from an India Experiment  

Science Conference Proceedings (OSTI)

Cool roofs, cool pavements, and urban vegetation reduce energy use in buildings, lower local air pollutant concentrations, and decrease greenhouse gas emissions from urban areas. This report summarizes the results of a detailed monitoring project in India and related simulations of meteorology and air quality in three developing countries. The field results quantified direct energy savings from installation of cool roofs on individual commercial buildings. The measured annual energy savings potential from roof-whitening of previously black roofs ranged from 20-22 kWh/m2 of roof area, corresponding to an air-conditioning energy use reduction of 14-26% in commercial buildings. The study estimated that typical annual savings of 13-14 kWh/m2 of roof area could be achieved by applying white coating to uncoated concrete roofs on commercial buildings in the Metropolitan Hyderabad region, corresponding to cooling energy savings of 10-19%. With the assumption of an annual increase of 100,000 square meters of new roof construction for the next 10 years in the Metropolitan Hyderabad region, the annual cooling energy savings due to whitening concrete roof would be 13-14 GWh of electricity in year ten alone, with cumulative 10-year cooling energy savings of 73-79 GWh for the region. The estimated savings for the entire country would be at least 10 times the savings in Hyderabad, i.e., more than 730-790 GWh. We estimated that annual direct CO2 reduction associated with reduced energy use would be 11-12 kg CO2/m2 of flat concrete roof area whitened, and the cumulative 10-year CO2 reduction would be approximately 0.60-0.65 million tons in India. With the price of electricity estimated at seven Rupees per kWh, the annual electricity savings on air-conditioning would be approximately 93-101 Rupees per m2 of roof. This would translate into annual national savings of approximately one billion Rupees in year ten, and cumulative 10-year savings of over five billion Rupees for cooling energy in India. Meteorological simulations in this study indicated that a reduction of 2C in air temperature in the Hyderabad area would be likely if a combination of increased surface albedo and vegetative cover are used as urban heat-island control strategies. In addition, air-temperature reductions on the order of 2.5-3.5C could be achieved if moderate and aggressive heat-island mitigation measures are adopted, respectively. A large-scale deployment of mitigation measures can bring additional indirect benefit to the urban area. For example, cooling outside air can improve the efficiency of cooling systems, reduce smog and greenhouse gas (GHG) emissions, and indirectly reduce pollution from power plants - all improving environmental health quality. This study has demonstrated the effectiveness of cool-roof technology as one of the urban heat-island control strategies for the Indian industrial and scientific communities and has provided an estimate of the national energy savings potential of cool roofs in India. These outcomes can be used for developing cool-roof building standards and related policies in India. Additional field studies, built upon the successes and lessons learned from this project, may be helpful to further confirm the scale of potential energy savings from the application of cooler roofs in various regions of India. In the future, a more rigorous meteorological simulation using urbanized (meso-urban) meteorological models should be conducted, which may produce a more accurate estimate of the air-temperature reductions for the entire urban area.

Akbari, Hashem; Xu, Tengfang; Taha, Haider; Wray, Craig; Sathaye, Jayant; Garg, Vishal; Tetali, Surekha; Babu, M. Hari; Reddy, K. Niranjan

2011-05-25T23:59:59.000Z

340

Columbia River PUD - Residential Energy Efficiency Rebate Programs...  

Open Energy Info (EERE)

Windows: 6.00 per sq ft WallFloor Insulation: 0.65sq ft Attic Insulation: 0.02R-Value per square foot Heat Pump Water Heaters: 300-500unit Eligible System Size...

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Avista Utilities (Electric) - Residential Energy Efficiency Rebate...  

Open Energy Info (EERE)

Insulation: 0.50sq. ft. Attic and Ceiling Insulation: 0.25sq. ft. Energy Star New Home: 650 Installation Requirements Insulation: New insulation that increases the R-Value...

342

Building Energy Software Tools Directory: ZIP  

NLE Websites -- All DOE Office Websites (Extended Search)

ZIP ZIP logo. Program for estimating the economic levels or R-values of insulation in new or existing single family homes. Calculates economic levels of insulation for attics;...

343

City of Palo Alto Utilities - Commercial Energy Efficiency Rebate...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

- 80door LED Lighting: Custom Occupancy Sensors: 20 - 55unit Window Film: 1.35square foot AtticRoofWall Insulation: 0.15square foot Dishwasher: 50 - 500 Ozone...

344

Solar Dynamics | Open Energy Information  

Open Energy Info (EERE)

Dynamics Jump to: navigation, search Name Solar Dynamics Place Ottumwa, Iowa Zip IA 52501 Sector Solar Product Solar Dynamics is a US-based solar powered attic roof vents...

345

Building Energy Software Tools Directory: Construction R-value...  

NLE Websites -- All DOE Office Websites (Extended Search)

Skip to Content U.S. Department of Energy Energy Efficiency and Renewable Energy EERE Home | Programs & Offices | Consumer Information Building Energy Software Tools Directory...

346

Building Energy Software Tools Directory: Construction R-value...  

NLE Websites -- All DOE Office Websites (Extended Search)

Building Energy Software Tools Directory Printable Version Share this resource Home About the Directory Tools by Subject Tools Listed Alphabetically Tools by Platform PC...

347

Steep-Slope Assembly Testing of Clay and Concrete Tile With and Without Cool Pigmented Colors  

Science Conference Proceedings (OSTI)

Cool color pigments and sub-tile venting of clay and concrete tile roofs significantly impact the heat flow crossing the roof deck of a steep-slope roof. Field measures for the tile roofs revealed a 70% drop in the peak heat flow crossing the deck as compared to a direct-nailed asphalt shingle roof. The Tile Roofing Institute (TRI) and its affiliate members are keenly interested in documenting the magnitude of the drop for obtaining solar reflectance credits with state and federal "cool roof" building efficiency standards. Tile roofs are direct-nailed or are attached to a deck with batten or batten and counter-batten construction. S-Misson clay and concrete tile roofs, a medium-profile concrete tile roof, and a flat slate tile roof were installed on fully nstrumented attic test assemblies. Temperature measures of the roof, deck, attic, and ceiling, heat flows, solar reflectance, thermal emittance, and the ambient weather were recorded for each of the tile roofs and also on an adjacent attic cavity covered with a conventional pigmented and directnailed asphalt shingle roof. ORNL measured the tile's underside temperature and the bulk air temperature and heat flows just underneath the tile for batten and counter-batten tile systems and compared the results to the conventional asphalt shingle.

Miller, William A [ORNL

2005-11-01T23:59:59.000Z

348

Evaluation of the thermal resistance of a roof-mounted multi-reflective radiant barrier for tropical and humid conditions: Experimental study from field measurements  

E-Print Network (OSTI)

This paper deals with the experimental evaluation of a roof-mounted multi-reflective radiant barrier (MRRB), installed according to the state of the art, on a dedicated test cell. An existing experimental device was completed with a specific system for the regulation of the airflow rate in the upper air layer included in a typical roof from Reunion Island. Several experimental sequences were conducted to determine the thermal resistance of the roof according to several parameters and following a specific method. The mean method, well known in international standards (ISO 9869 - 1994) for the determination of the thermal resistance using dynamic data, was used. The method was implemented in a building simulation code in order to allow the determination of the thermal indicator automatically. Experimental results are proposed according to different seasonal periods and for different values of the airflow rate in the upper air layer.

Frdric Miranville; Ali Hamada Fakra; Stphane Guichard; Harry Boyer; Jean Philippe Praene; Dimitri Bigot

2012-12-19T23:59:59.000Z

349

Evaluation of the thermal resistance of a roof-mounted multi-reflective radiant barrier for tropical and humid conditions: Experimental study from field measurements  

E-Print Network (OSTI)

This paper deals with the experimental evaluation of a roof-mounted multi-reflective radiant barrier (MRRB), installed according to the state of the art, on a dedicated test cell. An existing experimental device was completed with a specific system for the regulation of the airflow rate in the upper air layer included in a typical roof from Reunion Island. Several experimental sequences were conducted to determine the thermal resistance of the roof according to several parameters and following a specific method. The mean method, well known in international standards (ISO 9869 - 1994) for the determination of the thermal resistance using dynamic data, was used. The method was implemented in a building simulation code in order to allow the determination of the thermal indicator automatically. Experimental results are proposed according to different seasonal periods and for different values of the airflow rate in the upper air layer

Miranville, Frdric; Guichard, Stphane; Boyer, Harry; Praene, Jean Philippe; Bigot, Dimitri

2012-01-01T23:59:59.000Z

350

NATIONAL RESEARCH COUNCIL OF CANADA DIVISION OF BUILDING RESEARCH PERFORMANCE OF INSULATIONS LOCATED ABOVE AN IMPERMEABLE MEMBRANE IN A FLAT ROOF SYSTEM  

E-Print Network (OSTI)

The impermeable membrane of a flat roof can be protected from solar radiation, the effects of extreme temperature variation, and from traffic damage by placing it beneath the roof insulation. This provides the membrane with a better chance of performing its function of protecting the building from the entry of moisture. Now, however, the insulation is exposed to the weather and may lose its thermal insulating properties by becoming wet. Using experimental facilities which permit exposure of materials to outdoor conditions, several insulations- both porous and closed cell- were incorporated into a roof system of this type. Moisture contents and thermal conductances were measured periodically over a span of about two years. The results are reported here. This is being followed by work involving similar measurements with other design arrangements.

C. P. Hedlin; D. G. Cole; N. B. Hutcheon

1971-01-01T23:59:59.000Z

351

Become One In A Million: Partnership Updates. Million Solar Roofs and Interstate Renewable Energy Council Annual Meeting, Washington, D.C., October 2005  

SciTech Connect

The U.S. Department of Energy's Million Solar Roofs Initiative (MSR) is a unique public-private partnership aimed at overcoming market barriers for photovoltaics (PV), solar water heating, transpired solar collectors, solar space heating and cooling, and pool heating. This report contains annual progress reports from 866 partners across the United States.

Tombari, C.

2005-09-01T23:59:59.000Z

352

Become One In A Million: Partnership Updates. Million Solar Roofs and Interstate Renewable Energy Council Annual Meeting, Washington, D.C., October 2005  

DOE Green Energy (OSTI)

The U.S. Department of Energy's Million Solar Roofs Initiative (MSR) is a unique public-private partnership aimed at overcoming market barriers for photovoltaics (PV), solar water heating, transpired solar collectors, solar space heating and cooling, and pool heating. This report contains annual progress reports from 866 partners across the United States.

Tombari, C.

2005-09-01T23:59:59.000Z

353

Buildings Energy Data Book: 3.7 Retail Markets and Companies  

Buildings Energy Data Book (EERE)

4 4 Advanced Energy Design Guide for Small Retail Buildings (1) Shell Percent Glass 0.4 Window (U-Factor 0.38-0.69 SHGC 0.40-0.44 Wall R-Value (2) 7.6-15.2 c.i. Roof R-Value Attic 30-60 Insulation Above Deck 15-25 c.i. Lighting Average Power Density (W/ft.^2) 1.3 System and Plant Heating Plant Gas Furnace(>225 kBtuh) 80% Combustion Efficiency Cooling Plant Air conditioner (>135-240 kBtuh) 10.8 EER/11.2 IPLV - 11.0 EER/11.5 IPLV Service Hot Water Gas Storage Water Heater (>75kBtuh) 90% Thermal Efficiency Note(s): Source(s): 1) Guide provides approximate parameters for constructing a building which is 30% more efficient than ASHRAE 90.1-1999. Ranges are due to climate zone dependencies. 2) Assumes a wall with heat content greaater than 7 Btu/ft^2. ASHRAE, Advanced Energy Design Guide for Small Retail Buildings, 2008

354

Buildings Energy Data Book: 3.6 Office Building Markets and Companies  

Buildings Energy Data Book (EERE)

7 7 Advanced Energy Design Guide for Small Office Buildings (1) Shell Percent Glass (WWR) 20-40% Window U-Factor 0.33-0.56 SHGC 0.31-0.49 Wall R-Value 7.6-15.2 Roof R-Value Attic 30-60 Insulation Above Deck 15-30 Wall Material Mass (HC > 7 Btu/ft^2) Lighting Average Power Density (Watts/SF) 0.9 System and Plant System and Plant Packaged Single-Zone Packaged Single-Zone w/ Economizer Cooling Capacity > 54 kBtu Heating Plant: Gas Furnace 80% Combustion Efficiency Cooling Plant: Air conditioner (135-240 thousand Btu*hr.) 10.8 EER/11.2 IPLV - 11.0 EER/11.5 IPLV Service Hot Water: Gas Water Heater 90% Thermal Efficiency Note(s): Source(s): 1) Guide provides approximate parameters for constructing a building which is 30% more efficient than ASHRAE 90.1-1999. Ranges are because of climate zone dependencies.

355

Buildings Energy Data Book: 3.9 Educational Facilities  

Buildings Energy Data Book (EERE)

8 8 Advanced Energy Design Guide for Typical Educational Facilities (1) Shell Percent Glass Maximum 35% Window U-Factor 0.33 - 0.56 Wall R-Value 5.7 - 15.2 Roof R-Value Attic 30.0 - 60.0 Insulation Above Deck 25.0 Wall Material Mass: Heat Capacity > 7 Btu/SF*F Lighting Average Power Density(Watts/ft.^2) With Daylighting 1.2 Without Daylighting 0.9 - 1.1 System and Plant System and Plant 1 Central System Packaged Multi-Zone w/ Economizer Comply with ASHRAE 90.1 Heating Plant: Gas Boiler 80-85 Combustion Efficiency Cooling Plant: Water-Cooled Chiller Comply with ASHRAE 90.1 Service Hot Water: Gas Boiler 90 Combustion Efficiency Note(s): Source(s): 1) Guide provides approximate parameters for constructing a building which is 30% more efficient than ASHRAE 90.1-1999. Ranges are because of climate zone dependencies.

356

Roofs | Open Energy Information  

Open Energy Info (EERE)

Clean Energy Analysis Low Emission Development Strategies Oil & Gas Smart Grid Solar U.S. OpenLabs Utilities Water Wind Page Actions View source History View New Pages...

357

Photovoltaic roof heat flux  

E-Print Network (OSTI)

and a major factor of energy usage (-37%) is the amount ofdesign approaches to reduce energy usage i n order to coollongest, a n d hence the energy usage was the largest d u r

Samady, Mezhgan Frishta

2011-01-01T23:59:59.000Z

358

Photovoltaic roof heat flux  

E-Print Network (OSTI)

showed that a solar panel over a rooftop w i l l lead to aalbedo (or solar reflectance) by painting the rooftops whitesolar panel offset height became a key component for rooftop

Samady, Mezhgan Frishta

2011-01-01T23:59:59.000Z

359

Photovoltaic roof heat flux  

E-Print Network (OSTI)

represent the total H V A C energy usage for that day. Otherrepresent the total H V A C energy usage for that day. Other

Samady, Mezhgan Frishta

2011-01-01T23:59:59.000Z

360

Photovoltaic roof heat flux  

E-Print Network (OSTI)

and could the heat transfer processes be modeled to estimateindicating that the heat transfer processes were modeled w i

Samady, Mezhgan Frishta

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Energy impacts of attic duct retrofits in Sacramento houses  

Science Conference Proceedings (OSTI)

Inefficiencies in air distribution systems have been identified as a major source of energy loss in US sunbelt homes. Research indicates that approximately 30--40% of the thermal energy delivered to the ducts passing through unconditioned spaces is lost through air leakage and conduction through the duct walls. Field experiments over the past several years have well documented the expected levels of air leakage and the extent to which that leakage can be reduced by retrofit. Energy savings have been documented to a more limited extent, based upon a few field studies and simulation model results. Simulations have also indicated energy loss through ducts during the off cycle caused by thermosiphon-induced flows, however this effect had not been confirmed experimentally. A field study has been initiated to separately measure the impacts of combined duct leak sealing and insulation retrofits, and to optimize a retrofit protocol for utility DSM programs. This paper describes preliminary results from 6 winter and 5 summer season houses. These retrofits cut overall duct leakage area approximately 64%, which translated to a reduction in envelope ELA of approximately 14%. Wrapping ducts and plenums with R-6 insulation translated to a reduction in average flow-weighted conduction losses of 33%. These experiments also confirmed the appropriateness of using duct ELA and operating pressures to estimate leakage flows for the population, but indicated significant variations between these estimates and measured flows on a house by house basis. In addition, these experiments provided a confirmation of the predicted thermosiphon flows, both under winter and summer conditions. Finally, average material costs were approximately 20% of the total retrofit costs, and estimates of labor required for retrofits based upon these experiments were: 0.04 person-hrs/cm{sup 2} of duct sealed and 0.21 person-hrs/m{sup 2} of duct insulated.

Jump, D.; Modera, M. [Lawrence Berkeley Lab., CA (United States). Energy and Environment Div.

1994-08-01T23:59:59.000Z

362

Moisture Measurements in Residential Attics Containing Radiant Barriers  

Science Conference Proceedings (OSTI)

Horizontal radiant barriers, rigorously tested during a typical Tennessee winter, allowed moisture to dissipate on a diurnal cycle and caused no structural, wet insulation, or stained-ceiling problems.

1989-08-21T23:59:59.000Z

363

Where to Insulate in a Home | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Where to Insulate in a Home Where to Insulate in a Home Where to Insulate in a Home November 26, 2013 - 1:34pm Addthis Examples of where to insulate. 1. In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below. (1A) attic access door 2. In finished attic rooms with or without dormer, insulate (2A) between the studs of "knee" walls, (2B) between the studs and rafters of exterior walls and roof, (2C) and ceilings with cold spaces above. (2D) Extend insulation into joist space to reduce air flows. 3. All exterior walls, including (3A) walls between living spaces and unheated garages, shed roofs, or storage areas; (3B) foundation walls above ground level; (3C) foundation walls in heated basements, full wall either interior or exterior.

364

Where to Insulate in a Home | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Where to Insulate in a Home Where to Insulate in a Home Where to Insulate in a Home November 26, 2013 - 1:34pm Addthis Examples of where to insulate. 1. In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below. (1A) attic access door 2. In finished attic rooms with or without dormer, insulate (2A) between the studs of "knee" walls, (2B) between the studs and rafters of exterior walls and roof, (2C) and ceilings with cold spaces above. (2D) Extend insulation into joist space to reduce air flows. 3. All exterior walls, including (3A) walls between living spaces and unheated garages, shed roofs, or storage areas; (3B) foundation walls above ground level; (3C) foundation walls in heated basements, full wall either interior or exterior.

365

Accelerated Aging of Roofing Surfaces  

NLE Websites -- All DOE Office Websites (Extended Search)

Ohio CRRC, Arizona CRRC, Florida CRRC, Ohio 6 | Building Technologies Office eere.energy.gov Approach: develop accelerated aging method Accelerated soiling (atmospheric...

366

Cool Roofs and Solar Shingles  

Science Conference Proceedings (OSTI)

A 60% reduction in CO2 emissions will be needed in the buildings sector by 2050 compared to today's level if the goal of limiting global temperature rise to...

367

Insulation Fact Sheet  

NLE Websites -- All DOE Office Websites (Extended Search)

DOE/CE-0180 DOE/CE-0180 2008 Department of Energy Assistant Secretary Energy Efficiency and Renewable Energy Contents: Introduction Why Insulate Your House? How Insulation Works Which Kind of Insulation is Best? What Is an R-Value? Reading the Label Insulation Product Types Insulating a New House Where and How Much Air Sealing Moisture Control and Ventilation Installation Issues Precautions Attics Walls Design Options Crawlspaces and Slabs Advanced Wall Framing Metal Framing Insulating Concrete Forms Massive Walls Structural Insulated Panels External Insulation Finish System Attic Ventilation or a Cathedralized Attic Adding Insulation to an Existing House Where and How Much How Much Insulation Do I Already Have? Air Sealing Moisture Control and Ventilation Insulation Installation, the Retrofit Challenge

368

Measure Guideline: Implementing a Plenum Truss for a Compact Air Distribution System  

SciTech Connect

This Measure Guideline presents the steps to implement a compact duct system inside an attic bulkhead (plenum truss) of a one-story, slab-on-grade (SOG) home. In a compact duct design, ductwork runs are reduced in length to yield a smaller and more compact duct system. Less energy will be lost through ductwork if the ducts are contained within the thermal enclosure of the house. These measures are intended for the production builder working to meet the 2012 International Energy Conservation Code (IECC) requirements and keep the ductwork within the thermal enclosure of the house. This measure of bringing the heating, ventilation and air conditioning (HVAC) equipment and ductwork within the thermal enclosure of the house is appropriate for the builder wishing to avoid cathedralizing the insulation in the attic space (i.e., locating it at the underside of the roof deck rather than along the attic floor) or adding dropped soffits.

Burdick, A.

2013-10-01T23:59:59.000Z

369

PowerChoice Residential Customer Response to TOU Rates  

E-Print Network (OSTI)

Reflective window coating Radiant barrier in attic Plantedwindow coating (10) Radiant barrier in attic (11) Planted

Peters, Jane S.

2010-01-01T23:59:59.000Z

370

Insulation Materials | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Insulation Materials Insulation Materials Insulation Materials May 30, 2012 - 10:08am Addthis Cellulose, a fiber insulation material with a high recycled content, is blown into a home attic. | Photo courtesy of Cellulose Insulation Manufacturers Association. Cellulose, a fiber insulation material with a high recycled content, is blown into a home attic. | Photo courtesy of Cellulose Insulation Manufacturers Association. Blown-in fiberglass insulation thoroughly fills the stud cavities in this home. | Photo courtesy of Bob Hendron, NREL. Blown-in fiberglass insulation thoroughly fills the stud cavities in this home. | Photo courtesy of Bob Hendron, NREL. Rigid foam board adds R-value to this wall in a Florida home. | Photo courtesy of FSEC/IBACOS. Rigid foam board adds R-value to this wall in a Florida home. | Photo

371

Insulation Materials | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Materials Materials Insulation Materials May 30, 2012 - 10:08am Addthis Cellulose, a fiber insulation material with a high recycled content, is blown into a home attic. | Photo courtesy of Cellulose Insulation Manufacturers Association. Cellulose, a fiber insulation material with a high recycled content, is blown into a home attic. | Photo courtesy of Cellulose Insulation Manufacturers Association. Blown-in fiberglass insulation thoroughly fills the stud cavities in this home. | Photo courtesy of Bob Hendron, NREL. Blown-in fiberglass insulation thoroughly fills the stud cavities in this home. | Photo courtesy of Bob Hendron, NREL. Rigid foam board adds R-value to this wall in a Florida home. | Photo courtesy of FSEC/IBACOS. Rigid foam board adds R-value to this wall in a Florida home. | Photo

372

City of San Marcos - Energy Efficient Home Rebate Program (Texas) |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

City of San Marcos - Energy Efficient Home Rebate Program (Texas) City of San Marcos - Energy Efficient Home Rebate Program (Texas) City of San Marcos - Energy Efficient Home Rebate Program (Texas) < Back Eligibility Residential Savings Category Home Weatherization Sealing Your Home Design & Remodeling Windows, Doors, & Skylights Heating & Cooling Commercial Heating & Cooling Heat Pumps Program Info State Texas Program Type Utility Rebate Program Rebate Amount Air Conditioner SEER 14.5: $75/ton Air Conditioner SEER 15.0: $100/ton Air Conditioner SEER 16.0: $125/ton Air Conditioner SEER 17.0: $150/ton Heat Pump SEER 14.5: $100/ton Heat Pump SEER 15.0: $125/ton Heat Pump SEER 16.0: $150/ton Heat Pump SEER 17.0: $175/ton Attic Floor Insulation: (square feet of application area)x(R-value added)x(0.0075) Attic Spray Foam Insulation: (square feet of application area)x(R-value

373

U.S. Department of Energy NEPA Categorical Exclusion Determination Form  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

KY-County-Bullitt KY-County-Bullitt Location: County Bullitt KY American Recovery and Reinvestment Act: Proposed Action or Project Description 1) Development of an energy efficiency and conservation strategy (completed), 2) retrofit the Annex building (1979) by installation of a new roof structure and roof with attic ventilation, addition of new attic insulation, and replacement of the HVAC system with a more energy efficient system, 3) replacement of the inaccurate natural gas meter at the Community Action/Red Cross Building, 4) retrofit the pumps and controls for five sanitary sewer lift stations Conditions: None Categorical Exclusion(s) Applied: A9, A11, B2.5, B5.1 *-For the complete DOE National Environmental Policy Act regulations regarding categorical exclusions, see Subpart D of 10 CFR10 21

374

Tips: Insulation | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Insulation Insulation Tips: Insulation May 2, 2012 - 6:03pm Addthis Where to Insulate. Adding insulation in the areas shown here may be the best way to improve your home's energy efficiency. Insulate either the attic floor or under the roof. Check with a contractor about crawl space or basement insulation. Where to Insulate. Adding insulation in the areas shown here may be the best way to improve your home's energy efficiency. Insulate either the attic floor or under the roof. Check with a contractor about crawl space or basement insulation. Insulation is made from a variety of materials, and it usually comes in four types: rolls and batts, loose-fill, rigid foam, and foam-in-place. Rolls and Batts Rolls and batts -- or blankets -- are flexible products made from mineral

375

CX-001783: Categorical Exclusion Determination | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

83: Categorical Exclusion Determination 83: Categorical Exclusion Determination CX-001783: Categorical Exclusion Determination Kentucky-County-Bullitt CX(s) Applied: A9, A11, B2.5, B5.1 Date: 04/19/2010 Location(s): Bullitt County, Kentucky Office(s): Energy Efficiency and Renewable Energy Energy Efficiency and Conservation Block Grant for: 1) Development of an energy efficiency and conservation strategy (completed), 2) retrofit the Annex building (1979) by installation of a new roof structure and roof with attic ventilation, addition of new attic insulation, and replacement of the Heating Ventilation and Air Conditioning system with a more energy efficient system, 3) replacement of the inaccurate natural gas meter at the Community Action/Red Cross Building, 4) retrofit the pumps and controls for

376

Solar heated building structure  

Science Conference Proceedings (OSTI)

A solar heated building structure comprises an exterior shell including side walls and a roof section with the major portion of the roof section comprised of light transmitting panels or panes of material to permit passage of sunlight into the attic section of the building structure. The structure is provided with a central vertical hollow support column containing liquid storage tanks for the circulation and collection of heated water from a flexible conduit system located on the floor of the attic compartment. The central column serves as a heating core for the structure and communicates by way of air conduits or ducts with the living areas of the structure. Fan means are provided for continuously or intermittently circulating air over the hot water storage tanks in the core to transfer heat therefrom and distribute the heated air into the living areas.

Rugenstein, R.W.

1980-03-11T23:59:59.000Z

377

Unvented Attic Increases Energy Efficiency and Reduces Duct Losses - Sun Lake at Banning, California  

SciTech Connect

New houses in the Sun Lakes at Banning subdivision are designed by Pulte Homes with technical support from the Building Science Consortium as part of the U.S. Department of Energy's Building America Program. These homes save their homeowners money by applying the principles of ''whole-building'' design, which considers the house as a complete system instead of separate components.

Anderson, R.; Wells, N.

2001-09-05T23:59:59.000Z

378

Field measurement of the interactions between heat pumps and attic duct systems in residential buildings  

SciTech Connect

Research efforts to improve residential heat-pump performance have tended to focus on laboratory and theoretical studies of the machine itself, with some limited field research having been focused on in-situ performance and installation issues. One issue that has received surprisingly little attention is the interaction between the heat pump and the duct system to which it is connected. This paper presents the results of a field study that addresses this interaction. Field performance measurements before and after sealing and insulating the duct systems were made on three heat pumps. From the pre-retrofit data it was found that reductions in heat-pump capacity due to low outdoor temperatures and/or coil frosting are accompanied by lower duct-system energy delivery efficiencies. The conduction loss reductions, and thus the delivery temperature improvements, due to adding duct insulation were found to vary widely depending on the length of the particular duct section, the thermal mass of that duct section, and the cycling characteristics of the heat-pump. In addition, it was found that the use of strip-heat back-up decreased after the retrofits, and that heat-pump cycling increased dramatically after the retrofits, which respectively increase and decrease savings due to the retrofits. Finally, normalized energy use for the three systems which were operated consistently pre- and post-retrofit showed an average reduction of 19% after retrofit, which corresponds to a chance in overall distribution-system efficiency of 24%.

Modera, M.P.; Jump, D.A. [Lawrence Berkeley Lab., CA (United States). Energy and Environment Div.

1994-11-01T23:59:59.000Z

379

Building America Top Innovations Hall of Fame Profile … Attic Air Sealing Guidelines  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Terminology Terminology Air Barrier Material (ABM) --- A does not allow air to pass throu plywood/OSB, foam board, duc lumber. Backing --- Any material that s be sprayed so as to provide an glass batts. Baffle (B) --- Manufactured chu direct ventilation air flow up an foam board or cardboard. Thermal Blocking --- Any rigid heat sources like chimneys or metal and gypsum board. Fasteners --- Staples, screws o

380

Case study field evaluation of a systems approach to retrofitting a residential HVAC system  

E-Print Network (OSTI)

facing windows Radiant barrier in attic, low absorptivityfacing windows Radiant barrier in attic, low absorptivityfacing windows Radiant barrier in attic, low absorptivity

Walker, Iain S.; McWiliams, Jennifer A.; Konopacki, Steven J.

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Act: Jobs at Savannah River Site Weatherizing America Boys of Coshocton: Part Two Solar Decathlon Update from Secretary Chu Recovery Act Milestones President Barack Obama at...

382

Why Cool Roofs? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

the Recovery Act Transforming the American Economy Through Innovation Linac Coherent Light Source Overview Matt Rogers on AES Energy Storage Energy 101: Concentrating Solar Power...

383

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

the Recovery Act Transforming the American Economy Through Innovation Linac Coherent Light Source Overview Matt Rogers on AES Energy Storage Energy 101: Concentrating Solar Power...

384

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Energy 101: Energy Efficient Data Centers Energy 101: Daylighting Solar Smarter Faster Seven Traffic Signals in Two Minutes It Starts with Science... Demoing the Modified TALON...

385

Why Cool Roofs? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Energy 101: Energy Efficient Data Centers Energy 101: Daylighting Solar Smarter Faster Seven Traffic Signals in Two Minutes It Starts with Science... Demoing the Modified TALON...

386

Why Cool Roofs? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Act: Jobs at Savannah River Site Weatherizing America Boys of Coshocton: Part Two Solar Decathlon Update from Secretary Chu Recovery Act Milestones President Barack Obama at...

387

Demonstration of Energy Savings of Cool Roofs  

E-Print Network (OSTI)

transducer / current transformer power transducer / currentSoftware Power meter Current transformer Current Transformer

Konopacki, S.

2010-01-01T23:59:59.000Z

388

Why Cool Roofs? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

things about it is it also reflects that energy back into space. There is very little greenhouse gas effect for visible light. It's - the heat light is being trapped by the...

389

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

especially if you live in a warmer climate. The video shows pedestrians walking on a city street. Think about it this way... in the summertime we wear light-colored clothes because...

390

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Pledge? Conversation on the Future of the Wind Industry Science Lecture: Talking the Higgs Boson with Dr. Joseph Incandela Bill Gates and Deputy Secretary Poneman Discuss the...

391

Why Cool Roofs? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Pledge? Conversation on the Future of the Wind Industry Science Lecture: Talking the Higgs Boson with Dr. Joseph Incandela Bill Gates and Deputy Secretary Poneman Discuss the...

392

AEDG Implementation Recommendations: Roofs | Building Energy...  

NLE Websites -- All DOE Office Websites (Extended Search)

90.1-1999 Document type: AEDG Implementation Recommendations Target Audience: ArchitectDesigner Builder Contractor Engineer State: All States Contacts Web Site Policies...

393

Demonstration of Energy Savings of Cool Roofs  

E-Print Network (OSTI)

electricity use in residential and commercial buildings) and a decrease in net annual energy bills for the rate-

Konopacki, S.

2010-01-01T23:59:59.000Z

394

OUT Success Stories: Solar Roofing Shingles  

DOE Green Energy (OSTI)

Thin-film photovoltaic (PV) cells are now doubling as rooftop shingles. PV shingles offer many advantages. The energy generated from a building's PV rooftop shingles can provide power both to the building and the utility's power grid.

Johnson, N.

2000-08-31T23:59:59.000Z

395

Demonstration of Energy Savings of Cool Roofs  

E-Print Network (OSTI)

logging system, the rooftop solar reflectance was measuredand rooftop layers, and a weather tower to measure solarand rooftop layers, and a weather tower to measure solar

Konopacki, S.

2010-01-01T23:59:59.000Z

396

Aging and weathering of cool roofing membranes  

E-Print Network (OSTI)

National Research Council (NRC), Canada ABSTRACT Aging andNational Research Council (NRC) in Canada. The LBNL studyits original levels. The NRC study also included measuring

2005-01-01T23:59:59.000Z

397

Demonstration of Energy Savings of Cool Roofs  

E-Print Network (OSTI)

San Jose monitored daily air-conditioning electricity use vsB.la. Davis average daily air-conditioning electricity use1/97) Davis average daily air-conditioning electricity use

Konopacki, S.

2010-01-01T23:59:59.000Z

398

Weathering of roofing materials - an overview  

NLE Websites -- All DOE Office Websites (Extended Search)

and hasten diffusion of material components. Effects of moisture include decay of wood, acceleration of corrosion of metals, staining of clay, and freeze-thaw damage....

399

Why Cool Roofs? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Recovery Act Transforming the American Economy Through Innovation Linac Coherent Light Source Overview Matt Rogers on AES Energy Storage Energy 101: Concentrating Solar Power...

400

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Recovery Act Transforming the American Economy Through Innovation Linac Coherent Light Source Overview Matt Rogers on AES Energy Storage Energy 101: Concentrating Solar Power...

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Why Cool Roofs? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

The Future of Biofuels The Climate Challenge... and What's at Stake Sec. Chu Announces the First Auto Loans for Advanced Technologies...

402

OUT Success Stories: Solar Roofing Shingles  

DOE R&D Accomplishments (OSTI)

Thin-film photovoltaic (PV) cells are now doubling as rooftop shingles. PV shingles offer many advantages. The energy generated from a building's PV rooftop shingles can provide power both to the building and the utility's power grid.

Johnson, N.

2000-08-00T23:59:59.000Z

403

Demonstration of Energy Savings of Cool Roofs  

E-Print Network (OSTI)

Philadelphia, Phoenix, and Washington DC/Baltimore. Sum totals for all 11 MSAs were: annual electricity

Konopacki, S.

2010-01-01T23:59:59.000Z

404

Metal Roofing Alliance (MRA) | Open Energy Information  

Open Energy Info (EERE)

WA Information About Partnership with NREL Partnership with NREL Yes Partnership Type Test & Evaluation Partner Partnering Center within NREL Electricity Resources & Building...

405

Reformulation of a Roofing Tiles Body  

Science Conference Proceedings (OSTI)

The results showed that both sand and illitic clay contribute to reduce the water absorption of ... Characterization of Fluorescent Lamp Glass Waste Powders for...

406

Demonstration of Energy Savings of Cool Roofs  

E-Print Network (OSTI)

is transferred through a radiant barrier attached under thedeck ventilated plenum radiant barrier return plenum R-19of 16%. There is a radiant barrier and a well-ventilated

Konopacki, S.

2010-01-01T23:59:59.000Z

407

Demonstration of Energy Savings of Cool Roofs  

E-Print Network (OSTI)

platinum R T D platinum RTD plenum air 2 - Davis 3 - GilroyData Logger NEMA1 Enclosure RTD Thermal Ribbon Descriptionsurface temperatures converts RTD readings for data logger

Konopacki, S.

2010-01-01T23:59:59.000Z

408

Demonstration of Energy Savings of Cool Roofs  

E-Print Network (OSTI)

description building ft daily a/c savings insulation Davislocation building type daily a/c savings 1000ft insulationbuilding type location daily a/c savings 1000ft kWh/1000ft insulation

Konopacki, S.

2010-01-01T23:59:59.000Z

409

Demonstration of Energy Savings of Cool Roofs  

E-Print Network (OSTI)

layers, and a weather tower to measure solar radiation, windlayers, and a weather tower to measure solar radiation, windWeather outside temperature * relative humidity* wind speed and direction' solar

Konopacki, S.

2010-01-01T23:59:59.000Z

410

Energy 101: Cool Roofs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Security & Safety -Emergency Response & Procedures or Search Energy.gov Search Clear Filters All Videos ARPA-E 2011 Keynote: Dr. Arun Majumdar ARPA-E 2011 Keynote: Ray Mabus,...

411

Why Cool Roofs? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Security & Safety -Emergency Response & Procedures or Search Energy.gov Search Clear Filters All Videos ARPA-E 2011 Keynote: Dr. Arun Majumdar ARPA-E 2011 Keynote: Ray Mabus,...

412

Electricity production and cooling energy savings from installation of a  

NLE Websites -- All DOE Office Websites (Extended Search)

production and cooling energy savings from installation of a production and cooling energy savings from installation of a building-integrated photovoltaic roof on an office building Title Electricity production and cooling energy savings from installation of a building-integrated photovoltaic roof on an office building Publication Type Journal Article Year of Publication 2013 Authors Ban-Weiss, George, Craig P. Wray, William W. Delp, Peter Ly, Hashem Akbari, and Ronnen M. Levinson Journal Energy and Buildings Volume 56 Pagination 210 - 220 ISSN 0378-7788 Keywords Advanced Technology Demonstration, building design, Building heat transfer, cool roof, energy efficiency, Energy Performance of Buildings, energy savings, Energy Usage, energy use, Heat Island Abstract Reflective roofs can reduce demand for air conditioning and warming of the atmosphere. Roofs can also host photovoltaic (PV) modules that convert sunlight to electricity. In this study we assess the effects of installing a building integrated photovoltaic (BIPV) roof on an office building in Yuma, AZ. The system consists of thin film PV laminated to a white membrane, which lies above a layer of insulation. The solar absorptance of the roof decreased to 0.38 from 0.75 after installation of the BIPV, lowering summertime daily mean roof upper surface temperatures by about 5 °C. Summertime daily heat influx through the roof deck fell to ±0.1 kWh/m2from 0.3-1.0 kWh/m2. However, summertime daily heat flux from the ventilated attic into the conditioned space was minimally affected by the BIPV, suggesting that the roof was decoupled from the conditioned space. Daily PV energy production was about 25% of building electrical energy use in the summer. For this building the primary benefit of the BIPV appeared to be its capacity to generate electricity and not its ability to reduce heat flows into the building. Building energy simulations were used to estimate the cooling energy savings and heating energy penalties for more typical buildings.

413

Austin Energy - Residential Energy Efficiency Rebate Program | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Austin Energy - Residential Energy Efficiency Rebate Program Austin Energy - Residential Energy Efficiency Rebate Program Austin Energy - Residential Energy Efficiency Rebate Program < Back Eligibility Residential Savings Category Home Weatherization Commercial Weatherization Heating & Cooling Commercial Heating & Cooling Cooling Sealing Your Home Ventilation Heat Pumps Appliances & Electronics Water Heating Windows, Doors, & Skylights Maximum Rebate Up to 20% of the cost of improvements, up to $1,575 Bonus incentives up to $700 Program Info State Texas Program Type Utility Rebate Program Rebate Amount Central AC/Heat Pump: $350 - $600 Package Unit AC/Heat Pump: $400 - $550 Weatherization Bonus: $250 - $500 Solar Screens/Solar Film: $1/sq. ft. Attic Insulation to R-38: varies by original R-value Radiant Barrier: $0.10/sq. ft. of accessible attic space

414

Missouri Gas Energy (MGE) - Home Performance with ENERGY STAR | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Missouri Gas Energy (MGE) - Home Performance with ENERGY STAR Missouri Gas Energy (MGE) - Home Performance with ENERGY STAR Missouri Gas Energy (MGE) - Home Performance with ENERGY STAR < Back Eligibility Construction Multi-Family Residential Residential Savings Category Home Weatherization Commercial Weatherization Sealing Your Home Design & Remodeling Windows, Doors, & Skylights Ventilation Heating & Cooling Commercial Heating & Cooling Maximum Rebate Total Incentives: $600 ($1200 with KCP&L rebate) Wall Insulation: $600 Floor Insulation: $400 Attic Insulation: $500 Air Sealing: $400 Duct Sealing: $200 Window or Door: $400 Program Info Funding Source MGE State Missouri Program Type Utility Rebate Program Rebate Amount Single Family Energy Assessment: $400/unit Multi Family Energy Assessment: $200/unit Attic Insulation: $0.01-$0.02 x R-Value Added x sq. ft.

415

Encapsulated and Buried Ducts  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Encapsulated and Buried Ducts Robb Aldrich Steven Winter Associates, Inc. Why Buried Ducts?  Ductwork thermal losses can range from 10-45%  Interior ducts current solution, but may be impractical, expensive, or increase envelope loads Insulation & Air Barrier First Tests - Florida Early Buried Duct Tests (FL) Condensation? Master Bedroom Duct in Attic 10 15 20 25 30 35 40 45 50 55 Duct Top Temp Duct Side Temp Duct Bot. Temp Duct Side Dewpoint Duct Bot. Dewpoint Attic Temp 7/8/2000 7/8/2000 7/8/2000 7/8/2000 7/8/2000 7/8/2000 7/9/2000 0:00 4:00 8:00 12:00 16:00 20:00 0:00 Time California: Much drier, no Problem Implementation Getting it Right... in Florida A Solution for Humid Climates Encapsulated, then Buried Research Questions  What are the effective R-values?

416

Energy Efficiency and Conservation Block Grant Program  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

OK-TRIBE-IOWA TRIBE OF OKLAHOMA Energy Efficiency and Conservation Block Grant Program Location: Tribe OK-TRIBE-IOWA TRIBE OF OKLAHOMA OK American Recovery and Reinvestment Act: Proposed Action or Project Description The Iowa Tribe of Oklahoma proposes to develop an energy efficiency strategy and also attend workshops and training on retrofitting tribal buildings. In addition, building retrofits would be conducted on tribal buildings built around the 1989-2003 time period and would include: attic insulation, door weather stripping, caulk windows, repair air conditioning (A/C) units and replace line insulation, increase attic ventilation, replace and repair doors, replace inefficient A/C units with energy efficient units, install window film, roof insulation, hot water tank replacements and insulate lines, and installation of automatic controls

417

City of Palo Alto Utilities - Smart Energy Rebate Program | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

City of Palo Alto Utilities - Smart Energy Rebate Program City of Palo Alto Utilities - Smart Energy Rebate Program City of Palo Alto Utilities - Smart Energy Rebate Program < Back Eligibility Residential Savings Category Heating & Cooling Commercial Heating & Cooling Heating Home Weatherization Commercial Weatherization Cooling Appliances & Electronics Commercial Lighting Lighting Water Heating Maximum Rebate Offer is limited to one rebate per CPAU account per program period, for each qualifying measure Program Info State California Program Type Utility Rebate Program Rebate Amount Dishwashers: $50 Refrigerators: $50 Refrigerator Recycling Bonus: $35 Clothes Washers: $125 Power Strips: $10 Gas Furnaces: $200 Central AC Replacement: $200 - $300 Solar Attic Fan: $25 Boilers: $300 Attic/Roof/Wall Insulation: $150 - $200

418

U.S. Department of Energy NEPA Categorical Exclusion Determination Form  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

OK-TRIBE-IOWA TRIBE OF OKLAHOMA OK-TRIBE-IOWA TRIBE OF OKLAHOMA Location: Tribe OK-TRIBE-IOWA TRIBE OF OKLAHOMA OK American Recovery and Reinvestment Act: Proposed Action or Project Description: The Iowa Tribe of Oklahoma proposes to develop an energy efficiency strategy and also attend workshops and training on retrofitting tribal buildings. In addition, building retrofits would be conducted on tribal buildings built around the 1989-2003 time period and would include: attic insulation, door weather stripping, caulk windows, repair air conditioning (A/C) units and replace line insulation, increase attic ventilation, replace and repair doors, replace inefficient A/C units with energy efficient units, install window film, roof insulation, hot water tank replacements and insulate lines, and installation of automatic controls

419

Home Energy Article: A Systems Approach to Retrofitting Residential HVAC Systems  

E-Print Network (OSTI)

facing windows Radiant barrier in attic, low absorbtivityto reduce solar loads Add radiant barrier in attic, or low

McWilliams, Jennifer A.; Walker, Iain S.

2005-01-01T23:59:59.000Z

420

A systems approach to retrofitting residential HVAC systems  

E-Print Network (OSTI)

facing windows Radiant barrier in attic, low absorbtivityto reduce solar loads Add radiant barrier in attic, or low

McWilliams, J.A.; Walker, I.S.

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

National Grid (Gas) - Commercial Energy Efficiency Rebate Programs (Upstate  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Gas) - Commercial Energy Efficiency Rebate Programs Gas) - Commercial Energy Efficiency Rebate Programs (Upstate New York) National Grid (Gas) - Commercial Energy Efficiency Rebate Programs (Upstate New York) < Back Eligibility Commercial Industrial Savings Category Heating & Cooling Commercial Heating & Cooling Heating Home Weatherization Commercial Weatherization Cooling Other Sealing Your Home Ventilation Construction Manufacturing Appliances & Electronics Water Heating Windows, Doors, & Skylights Buying & Making Electricity Maximum Rebate Custom Projects: $100,000 Energy Efficiency Engineering Study: $10,000 Steam Trap Survey: $2500 (+$2500 if complete recommended repairs) ENERGY STAR Programmable Thermostats: 5 units Boiler Reset Controls: 2 unit max Pipe Insulation: 500 ln. ft. Building Insulation: $10,000/account for roof, attic and wall insulation

422

Emerging Technologies Activities | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Emerging Technologies Activities Emerging Technologies Activities Emerging Technologies Activities The Emerging Technologies team focuses on the development and testing of next-generation technologies that can increase the energy efficiency of existing technologies and help support the goal of reducing energy consumption by at least 50%. By partnering with industry, researchers, and other stakeholders, the Department of Energy (DOE) acts as a catalyst in driving research in energy efficient technologies, including: Refrigerators, washers, dryers, and other appliances Parts of the building envelope, including insulation, roofing and attics, foundations, and walls Window, skylight, and door technologies, such as highly-insulating windows, glazings and films, window frames, and daylighting and shading

423

Establish feasibility for providing passive cooling with solar updraft and evaporative downdraft chimneys  

DOE Green Energy (OSTI)

Natural draft towers can be used for cooling and ventilating structures. From an operational perspective, the downdraft evaporatively cooled tower is preferred for a dry climate. Solar chimneys, when used alone, tend to require an excessively large solar collector area when appreciable quantities of air must be moved. When used in combination with a downdraft tower, the roof and attic of buildings may assist the solar chimney and their use becomes more attractive. Both a frame building and a greenhouse were successfully cooled during this program. The economics of the downdraft tower compare favorably with conventional evaporative cooling for some application.

Cunningham, W.A.; Mignon, G.V.; Thompson, T.L.

1987-01-01T23:59:59.000Z

424

Establish feasibility for providing passive cooling with solar updraft and evaporate downdraft chimneys. Final report, June 15, 1984--December 31, 1987  

DOE Green Energy (OSTI)

Natural draft towers can be used for cooling and ventilating structures. From an operational perspective, the downdraft evaporatively cooled tower is preferred for a dry climate. Solar chimneys, when used alone, tend to require an excessively large solar collector area when appreciable quantities of air must be moved. When used in combination with a downdraft tower, the roof and attic of buildings may assist the solar chimney and their use becomes more attractive. Both a frame building and a greenhouse were successfully cooled during this program. The economics of the downdraft tower compare favorably with conventional evaporative cooling for some applications.

Cunningham, W.A.; Mignon, G.V.; Thompson, T.L.

1987-12-31T23:59:59.000Z

425

Establish feasibility for providing passive cooling with solar updraft and evaporate downdraft chimneys  

DOE Green Energy (OSTI)

Natural draft towers can be used for cooling and ventilating structures. From an operational perspective, the downdraft evaporatively cooled tower is preferred for a dry climate. Solar chimneys, when used alone, tend to require an excessively large solar collector area when appreciable quantities of air must be moved. When used in combination with a downdraft tower, the roof and attic of buildings may assist the solar chimney and their use becomes more attractive. Both a frame building and a greenhouse were successfully cooled during this program. The economics of the downdraft tower compare favorably with conventional evaporative cooling for some applications.

Cunningham, W.A.; Mignon, G.V.; Thompson, T.L.

1987-01-01T23:59:59.000Z

426

Establish feasibility for providing passive cooling with solar updraft and evaporative downdraft chimneys. Final report, June 15, 1984--December 31, 1987  

DOE Green Energy (OSTI)

Natural draft towers can be used for cooling and ventilating structures. From an operational perspective, the downdraft evaporatively cooled tower is preferred for a dry climate. Solar chimneys, when used alone, tend to require an excessively large solar collector area when appreciable quantities of air must be moved. When used in combination with a downdraft tower, the roof and attic of buildings may assist the solar chimney and their use becomes more attractive. Both a frame building and a greenhouse were successfully cooled during this program. The economics of the downdraft tower compare favorably with conventional evaporative cooling for some application.

Cunningham, W.A.; Mignon, G.V.; Thompson, T.L.

1987-12-31T23:59:59.000Z

427

INSTALLATION CERTIFICATE CF-6R-MECH-29-HERS Supply Duct Compliance Credits -Location; Surface Area; R-value (Page 1 of 2)  

E-Print Network (OSTI)

requirements and the building must meet Quality Insulation Installation requirements. Yes No The duct. Yes No Ducts are located within the conditioned volume of building. Yes to this compliance credit performance insulation. In order to claim these credits a detailed duct system design is required

428

Performance Testing of Radiant Barriers  

E-Print Network (OSTI)

TVA has conducted a study to determine the effects of radiant barriers (RBI (i.e., material with a low emissivity surface facing an air space), when used with fiberglass, on attic heat transfer during summer and winter. This study employed five small test cells exposed to ambient conditions and having attics with gable and soffit vents. Three different RB configurations were tested and compared to the non-RR configuration. Heat flux transducers determined the heat transfer between the attic and conditioned space. The results showed that all RB con figurations significantly reduced heat gain through the ceiling during the summer. Reductions in heat gain during daylight and peak electric load hours were especially attractive. Roof temperatures for the RB configurations were only slightly higher than for the non-RB case. Heat transfer reductions for the RB configurations in the winter were smaller than those for the summer but were still significant in many, but not all, situations. Savings during night and peak electric load hours were especially attractive.

Hall, J. A.

1986-01-01T23:59:59.000Z

429

New Smyrna Beach - Residential Energy Efficiency Rebate Program |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

New Smyrna Beach - Residential Energy Efficiency Rebate Program New Smyrna Beach - Residential Energy Efficiency Rebate Program New Smyrna Beach - Residential Energy Efficiency Rebate Program < Back Eligibility Residential Savings Category Home Weatherization Commercial Weatherization Heating & Cooling Commercial Heating & Cooling Cooling Sealing Your Home Ventilation Heat Pumps Insulation Design & Remodeling Windows, Doors, & Skylights Maximum Rebate Insulation: $375 Cool Roof: $375 Window Solar Screen: $375 Program Info Expiration Date 09/30/2013 State Florida Program Type Utility Rebate Program Rebate Amount Insulation: $0.125 per sq. ft. Window Solar Screen: $2 per sq. ft. Duct Leak Repair: 50% of cost, up to $200 AC/Heat Pump: $400 - $600 Cool Roof: $0.14/sq ft Solar Attic Fan: 25% of the cost, up to $200 Provider

430

 

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

B2.5 Safety and environmental improvements of a facility, replacement/upgrade of facility components B2.5 Safety and environmental improvements of a facility, replacement/upgrade of facility components The proposed energy efficiency retrofits include three individual activities to be funded with EECBG funds: * Activity #1 includes purchasing and installing up to 57 energy efficient furnaces in tribal residences to replace existing propane furnaces * Activity #2 includes conducting the following retrofits at the Eagle Butte Nutrition Center: - Replacing the building roof and insulating the attic space. The new roof will be equipped with gutters to capture and collect rain for use in local garden. - Replacing three skylights with windows on the west side of the building a Replacing the entrance doors * Activity #3 includes conducting the following retrofits at the Dupree Community Building:

431

Energy Sources | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Guidelines Guidelines '''''Note: In June 2007, the Arizona Corporation Commission (ACC) initiated a rulemaking process to establish statewide interconnection standards for distributed generation (DG). This proceeding is still in progress. Until the new official rules go into effect, the commission has recommended that the utilities use the [http://images.edocket.azcc.gov/docketpdf/0000074361.pdf Interconnection Document] as a guide. This document applies to systems up to 10 megawatts (MW) in capacity. ''''' October 16, 2013 Income Tax Deduction for Solar-Powered Roof Vents or Fans Indiana allows taxpayers to take a deduction on solar-powered roof fans (or vent, also sometimes called an attic fan) installed in a home that the taxpayer owns or leases. The deduction is for 50% of the cost of the

432

Expensive Moisture/Insulation System Problems at Several Central Florida and South Texas Nursing Homes  

E-Print Network (OSTI)

These nursing homes were designed and built in the 80's and 90's. They experienced similar design and construction deficiencies and expensive repairs. Some of the issues to be discussed in this paper are the interactions of architectural and HVAC shortcomings that result in a synergistic increase in mold, mildew, corrosion and rot. ASHRAE 62 requires 24 hour per day toilet exhaust and fresh air. What do you do to control humidity when the A/C duty cycles when the thermostat is satisfied? There needs to be humidity control designed into the HVAC system. Architects and contractors frequently take a "head in the sand" approach to wall and attic vapor barriers. This needs to be looked at realistically. We have seen several nursing homes whose moisture/sheet rock damage was severe due to design defects that allowed free interchange of hot humid air between the attic and the space inside interior partitions. Allowing air interchange between the attic and outdoors: can cause overheating of water in pipes in attics where temperaturs reach 150 F. increases condensation due to inadequate details in mechanical insulation on ducts and pipes Vinyl wall covering is well known to be a disaster in this climate but interior decorators continue to specify it on various walls. HVAC balance needs to be considered. Frequently the kitchen exhaust design is not coordinated with the HVAC engineer. There needs to be a reasonable balance between air in and air out of the building. When air is allowed to flow through the insulation system R value is reduced to near 0. In order to prevent mold and mildew and expensive failures, along with even more expensive lawsuits, the HVAC system design and the insulation system design must be integrated.

Lotz, W. A.

2000-01-01T23:59:59.000Z

433

Solar efficient structure  

Science Conference Proceedings (OSTI)

A solar efficient structure is disclosed which comprises a central chase positioned vertically within the structure and connected in fluid communication with a duct network positioned in thermal contact with the ground and with the attic of the structure. A fan is provided for circulating air through a perforated attic duct, through the various rooms of the structure, and through the duct network and the chase. In one embodiment, the fan is reversible so as to circulate the air in one direction, or in the other direction. When operating in the heating mode, the ground acts as a heat source to heat the air circulating through the duct network. Conversely, when operating in the cooling mode, the ground acts as a heat sink to cool the airflow circulating therethrough. A dehumidifier, and a heating or cooling means is provided for assisting in the conditioning of the circulating airflow. In one embodiment, the heating means comprises a greenhouse room which permits ultraviolet radiation to enter and heat the air contained therein, and a damper means for controlling the flow rate of the air circulating through the greenhouse room. The structure is fully insulated and includes a vent skin positioned about the exterior walls and the roof thereof. A method is disclosed for insulating the roof line with loose insulation.

Arenas, F.B.

1985-02-12T23:59:59.000Z

434

Energy efficiency study of single-wide manufactured homes  

SciTech Connect

This Cooperative Research and Development Agreement (CRADA) was among Tennessee Technological University, Clayton Homes, Inc., and Oak Ridge National Laboratory (ORNL). Manufactured homes now make up a substantial portion of the new home market, and improving the energy efficiency of these homes would save significant amounts of energy. This project explored the impact of differing levels of attic insulation, the use of evacuated insulation panels, and the application of a solar reflective roof coating. The performance of the installed roof cavity insulation compared favorably with that predicted by laboratory measurements. The more heavily insulated of the two units used about 30% less energy over the period of the project than the standard unit. Based on the experimental data, computer simulations for nine cities were completed for a single-wide manufactured home with the solar reflective roof coating. Annual electric power savings ranged from 894 kWh in Rapid City to 2119 kWh for the same roof area in Los Angeles. The field performance of vacuum insulation panels was compared with laboratory performance. The panels will perform as expected if protected from puncture.

Yarbrough, D.W.; Andrews, G.J.; Stovall, T.K.; Kelly, T.

1999-12-01T23:59:59.000Z

435

Cool roofs as an energy conservation measure for federal buildings  

E-Print Network (OSTI)

31000 kWh yr -1 and annual gas usage is 0.0732 7200 = 527= 26700 kWh yr -1 and annual gas usage is 0.081 7200 = 580electricity usage (kWh yr -1 ), 2) annual gas energy use (

Taha, Haider; Akbari, Hashem

2003-01-01T23:59:59.000Z

436

Status of cool roof standards in the United States  

E-Print Network (OSTI)

energy codes. Aside from California, these include Atlanta, GA; Chicago, IL; Florida; Georgia; Guam; and Hawaii.

Akbari, Hashem; Levinson, Ronnen

2008-01-01T23:59:59.000Z

437

Secretary Chu Announces Steps to Implement Cool Roofs at DOE...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

in cities around the world can help reduce the demand for air conditioning, cool entire cities, and potentially cancel the heating effect of up to two years of worldwide carbon...

438

Evolution of cool-roof standards in the United States  

E-Print Network (OSTI)

$/m ) California Climate Zone Typical Cost Premiums (0.0 -eight ASHRAE-defined climate zones in the United States (the 16 California climate zones (courtesy Eley Associates).

Akbari, Hashem

2008-01-01T23:59:59.000Z

439

ROOF OF THE WORLD: Tibetan Observation and Research Platform  

Science Conference Proceedings (OSTI)

The Tibetan Plateau, with the most prominent and complicated terrain on the globe and an elevation of more than 4,000 m, on average, above sea level, is very important in Asian monsoon circulation and global climate change. The lack of ...

Yaoming Ma; Shichang Kang; Liping Zhu; Baiquing Xu; Lide Tian; Tandong Yao

2008-10-01T23:59:59.000Z

440

Evolution of cool-roof standards in the United States  

E-Print Network (OSTI)

that stay cool in the sun by minimizing solar absorption andhigh solar reflectance can also stay cool in the sun.solar reflectance and high thermal emittance stay cool in the sun.

Akbari, Hashem

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Evolution of cool-roof standards in the United States  

E-Print Network (OSTI)

solar reflectance below 0.25, or thermal emittance less than 0.90) will require increased energy efficiency

Akbari, Hashem

2008-01-01T23:59:59.000Z

442

City of Grand Rapids Building Solar Roof Demonstration  

SciTech Connect

Grand Rapids, Michigan is striving to reduce it environmental footprint. The municipal government organization has established environmental sustainability policies with the goal of securing 100% of its energy from renewable sources by 2020. This report describes the process by which the City of Grand Rapids evaluated, selected and installed solar panels on the Water/Environmental Services Building. The solar panels are the first to be placed on a municipal building. Its new power monitoring system provides output data to assess energy efficiency and utilization. It is expected to generate enough clean solar energy to power 25 percent of the building. The benefit to the public includes the economic savings from reduced operational costs for the building; an improved environmentally sustainable area in which to live and work; and increased knowledge about the use of solar energy. It will serve as a model for future energy saving applications.

DeClercq, Mark; Martinez, Imelda

2012-08-31T23:59:59.000Z

443

Energy Department Completes Cool Roof Installation on DC Headquarters...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

can help achieve significant energy and cost savings. This is a simple, low-cost technology that can provide tremendous benefits for government, businesses and homeowners...

444

Maui County - Solar Roofs Initiative Loan Program (Hawaii) |...  

Open Energy Info (EERE)

the loan program and, through the Hawaii Energy Program, offers a 750 rebate for installations through its approved independent solar contractors. Residential homeowners...

445

Status of cool roof standards in the United States  

E-Print Network (OSTI)

Refrigerating, and Air-Conditioning Engineers. ASHRAE. 2001.Refrigerating, and Air-Conditioning Engineers. ASHRAE.Refrigerating, and Air-Conditioning Engineers. Konopacki, S.

Akbari, Hashem; Levinson, Ronnen

2008-01-01T23:59:59.000Z

446

Evolution of cool-roof standards in the United States  

E-Print Network (OSTI)

and reflectance measurements. Solar Energy Materials & Solarof common colorants. Solar Energy Materials & Solar Cellsroofing materials. Solar Energy Materials & Solar Cells 91,

Akbari, Hashem

2008-01-01T23:59:59.000Z

447

Ice Ball Impact Testing of Roofing Materials - Programmaster.org  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, Materials Science & Technology 2010. Symposium, Failure Analysis and Prevention. Presentation Title, Ice Ball Impact Testing of...

448

Hitting the Roof: Dow Launches Consumer-Friendly Solar Shingles  

Science Conference Proceedings (OSTI)

Posted on: 10/9/2009 12:00:00 AM... Money. Time. Aesthetics. These have generally been barriers to adoption of solar power in the residential housing market.

449

Energy Saving "Cool Roofs" Installed at Y-12 | National Nuclear...  

National Nuclear Security Administration (NNSA)

the United States Senate Committee on Armed Services Sep 17, 2013 NNSA, Republic of Korea Ministry Agree to Minimize Use of HEU in Nuclear Reactors Sep 3, 2013 NNSA Conducts...

450

Cool Colored Roofs to Save Energy and Improve Air Quality  

Science Conference Proceedings (OSTI)

Urban areas tend to have higher air temperatures than their rural surroundings as a result of gradual surface modifications that include replacing the natural vegetation with buildings and roads. The term ''Urban Heat Island'' describes this phenomenon. The surfaces of buildings and pavements absorb solar radiation and become extremely hot, which in turn warm the surrounding air. Cities that have been ''paved over'' do not receive the benefit of the natural cooling effect of vegetation. As the air temperature rises, so does the demand for air-conditioning (a/c). This leads to higher emissions from power plants, as well as increased smog formation as a result of warmer temperatures. In the United States, we have found that this increase in air temperature is responsible for 5-10% of urban peak electric demand for a/c use, and as much as 20% of population-weighted smog concentrations in urban areas. Simple ways to cool the cities are the use of reflective surfaces (rooftops and pavements) and planting of urban vegetation. On a large scale, the evapotranspiration from vegetation and increased reflection of incoming solar radiation by reflective surfaces will cool a community a few degrees in the summer. As an example, computer simulations for Los Angeles, CA show that resurfacing about two-third of the pavements and rooftops with reflective surfaces and planting three trees per house can cool down LA by an average of 2-3K. This reduction in air temperature will reduce urban smog exposure in the LA basin by roughly the same amount as removing the basin entire onroad vehicle exhaust. Heat island mitigation is an effective air pollution control strategy, more than paying for itself in cooling energy cost savings. We estimate that the cooling energy savings in U.S. from cool surfaces and shade trees, when fully implemented, is about $5 billion per year (about $100 per air-conditioned house).

Akbari, Hashem; Levinson, Ronnen; Miller, William; Berdahl, Paul

2005-08-23T23:59:59.000Z

451

Effects of solar photovoltaic panels on roof heat transfer  

E-Print Network (OSTI)

PV)systemsforbuildinginsulationarequantified through0.09to0.75 onabuildingwithoutinsulationresultedinto0.75onabuildingwithR?30insulation(anadditionof

Dominguez, Anthony; Kleissl, Jan; Luvall, Jeffrey C

2011-01-01T23:59:59.000Z

452

Roofing for a Region | Princeton Plasma Physics Lab  

NLE Websites -- All DOE Office Websites (Extended Search)

Join Our Mailing List A Collaborative National Center for Fusion & Plasma Research Search form Search Search Home About Overview Learn More Visiting PPPL History...

453

Installation of Cool Roofs on Department of Energy Buildings...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

2010nuclearfuturememo.pdf Disclosure of Permitted Communication Concerning Fossil Fuel Energy Consumption Reduction for New Construction and Major Renovations of Federal...

454

The design of a panelized roof system for residential construction  

E-Print Network (OSTI)

The cost of housing in the U.S. continues to rise faster than household income. Innovative building materials and construction technologies have the potential to reduce housing construction costs. One strategy to do this ...

Dentz, Jordan Lewis

1991-01-01T23:59:59.000Z

455

END POINT IMPLEMENTATION EXAMPLES End Point Implementation Examples  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

provide access to the attic. The large thermostatically controlled attic exhaust fan (approximately 3 ft. in diameter) is located on the South end of the facility is de-...

456

Homeowner Best Practices Guide for Residential Retrofits  

E-Print Network (OSTI)

to reduce solar loads Add radiant barrier in attic, or lowfacing windows Radiant barrier in attic, low absorbtivityattic: by adding radiant barriers (in predominantly cooling

Walker, Iain S.

2011-01-01T23:59:59.000Z

457

Building Green in Greensburg: Prairie Pointe Townhomes  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Prairie Pointe Townhomes Prairie Pointe Townhomes After a tornado destroyed most of Greensburg, Kansas, in 2007, the residents needed affordable housing. Prairie Pointe Townhomes is a low-income rental development that was completed in July 2008. Eight of the 16 units in this townhome complex were awarded the first residential U.S. Green Building Council Leadership in Energy and Environmental Design (LEED ® ) Platinum rating in Kansas and are estimated to use about 50% less energy than similar buildings built to existing building codes. ENERGY EFFICIENCY FEATURES * Well-insulated 2 x 6 walls use blown-in cellulose insulation with an R-Value of 22.5 to prevent heat loss and save energy * Well-insulated roof with an R-value of R-38 prevents heat loss through the roof and helps keep building cool in summer

458

 

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

B1.16 Removal of asbestos from buildings B1.16 Removal of asbestos from buildings Perform energy-efficiency retrofits on County facilities. Intended projects: Justice Center: Replace roof to increase insulation. No existing insulation, additional insulation is not possible without roof replacement. Current R- value is less than R-5; after replacement, R-value will be greater than R-30. Landfill: We intend to replace lighting in the office, garage, and exterior with high efficiency fixtures and bulbs. We also intend to install occupancy controls in rest rooms, etc., where feasible. Public Safety (Sheriff's office): We intend to replace interior and exterior lighting with high-efficiency fixtures and bulbs. Fairgrounds: We intend to replace interior and exterior lighting with high-efficiency fixtures and bulbs.

459

Building Design and Operation for Improving Thermal Comfort in Naturally Ventilated Buildings in a Hot-Humid Climate  

E-Print Network (OSTI)

The goal of this research was to develop new techniques for designing and operating unconditioned buildings in a hot-humid climate that could contribute to an improvement of thermal performance and comfort condition. The recommendations proposed in this research will also be useful for facility managers on how to maintain unconditioned buildings in this climate. This study investigated two unconditioned Thai Buddhist temples located in the urban area of Bangkok, Thailand. One is a 100-year-old, high-mass temple. The other is a 5-year-old, lower-mass temple. The indoor measurements revealed that the thermal condition inside both temples exceed the ASHRAE-recommended comfort zone. Surprisingly, the older temple maintained a more comfortable indoor condition due to its thermal inertia, shading, and earth contacts. A baseline thermal and airflow model of the old temple was established using a calibrated computer simulation method. To accomplish this, HEATX, a 3-D Computational Fluid Dynamics (CFD) code, was coupled with the DOE-2 thermal simulation program. HEATX was used to calculate the airflow rate and the surface convection coefficients for DOE-2, and DOE-2 was used to provide physical input variables to form the boundary conditions for HEATX. In this way calibrated DOE-2/CFD simulation model was accomplished, and the baseline model was obtained. To investigate an improved design, four design options were studied: 1) a reflective or low-solar absorption roof, 2) R-30 ceiling insulation, 3) shading devices, and 4) attic ventilation. Each was operated using three modes of ventilation. The low-absorption roof and the R-30 ceiling insulation options were found to be the most effective options, whereas the shading devices and attic ventilation were less effective options, regardless of which ventilation mode was applied. All design options performed much better when nighttime-only ventilation was used. Based on this analysis, two prototype temples was proposed (i.e., low-mass and high-mass temples). From the simulation results of the two prototypes, design and operation guidelines are proposed, which consist of: 1) increased wall and ceiling insulation, 2) white-colored, low-absorption roof, 3) slab-on-ground floor, 4) shading devices, 5) nighttime-only ventilation, 6) attic ventilation, and 7) wider openings to increase the natural ventilation air flow windows, wing walls, and vertical fins.

Sreshthaputra, Atch

2007-11-29T23:59:59.000Z

460

Glossary | Building Energy Codes Program  

NLE Websites -- All DOE Office Websites (Extended Search)

R-value R-value A measure (h ft2 °F/Btu) of thermal resistance, or how well a material or series of materials resists the flow of heat. The R-value is the reciprocal of the U-factor. Radiant Heating System A heating system that transfers heat to objects and surfaces within the heated space primarily (greater than 50%) by infrared radiation. Raised Truss Raised truss refers to any roof/ceiling construction that allows the insulation to achieve its full thickness over the plate line of exterior walls. Several constructions allow for this, including elevating the heel (sometimes referred to as an energy truss, raised-heel truss, or Arkansas truss), use of cantilevered or oversized trusses, lowering the ceiling joists, or framing with a raised rafter plate. Rated Lamp Wattage

Note: This page contains sample records for the topic "roof r-value attic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Buildings Energy Data Book: 9.4 High Performance Buildings  

Buildings Energy Data Book (EERE)

3 3 Case Study, The Visitor Center at Zion National Park, Utah (Service/Retail/Office) Building Design Vistors Center (1): 8,800 SF Comfort Station (2): 2,756 SF Fee Station: 170 SF Shell Windows Type U-Factor SHGC (3) South/East Glass Double Pane Insulating Glass, Low-e, Aluminum Frames, Thermally Broken 0.44 0.44 North/West Glass Double Pane Insulating Glass, Heat Mirror, Aluminum Frames, Thermally Broken 0.37 0.37 Window/Wall Ratio: 28% Wall/Roof Materials Effective R-Value Trombe Walls: Low-iron Patterned Trombe Wall, CMU (4) 2.3 Vistor Center Walls: Wood Siding, Rigid Insulation Board, Gypsum 16.5 Comfort Station Walls: Wood Siding, Rigid Insulation Board, CMU (4) 6.6 Roof: Wood Shingles; Sheathing; Insulated Roof Panels 30.9 HVAC Heating Cooling Trombe Walls Operable Windows Electric Radiant Ceiling Panels

462

Buildings Energy Data Book: 9.4 High Performance Buildings  

Buildings Energy Data Book (EERE)

5 5 Case Study, The Thermal Test Facility, National Renewable Energy Laboratory, Golden, Colorado (Office/Laboratory) Building Design Floor Area: 10,000 SF Floors(1): 2 Aspect Ratio: 1.75 Offices Laboratories Conference Room Mechanical Level Shell Windows Material U-factor SHGC(2) Viewing Windows: Double Pane, Grey Tint, Low-e 0.42 0.44 Clerestory Windows: Double Pane, Clear, Low-e 0.45 0.65 Window Area(SF) North 38 South(3) 1,134 East 56 West 56 Wall/Roof Material Effective R-Value North Wall Concrete Slab/Rigid Polystyrene 5.0 South/East/West Steel Studs/Batt Insulation/Concrete 23.0 Roof: Built-up/Polyisocianurate Covering/Steel Supports 23.0 HVAC VAV air handling unit Hot water supply paralell VAV boxes Direct and Indirect evaporative cooling system Single zone roof top unit(4) Hot Water Coil(4)

463

Numerical analysis of heat transfer by conduction and natural convection in loose-fill fiberglass insulation--effects of convection on thermal performance  

SciTech Connect

A two-dimensional code for solving equations of convective heat transfer in porous media is used to analyze heat transfer by conduction and convection in the attic insulation configuration. The particular cases treated correspond to loose-fill fiberglass insulation, which is characterized by high porosity and air permeability. The effects of natural convection on the thermal performance of the insulation are analyzed for various densities, permeabilities, and thicknesses of insulation. With convection increasing the total heat transfer through the insulation, the thermal resistance was found to decrease as the temperature difference across the insulating material increases. The predicted results for the thermal resistance are compared with data obtained in the large-scale climate simulator at the Roof Research Center using the attic test module, where the same phenomenon has already been observed. The way the wood joists within the insulation influence the start of convection is studied for differing thermophysical and dynamic properties of the insulating material. The presence of wood joists induces convection at a lower temperature difference.

Delmas, A.A.; Wilkes, K.E.

1992-04-01T23:59:59.000Z

464

Reducing Thermal Losses and Gains With Buried and Encapsulated Ducts in Hot-Humid Climates  

SciTech Connect

The Consortium for Advanced Residential Buildings (CARB) monitored three houses in Jacksonville, FL, to investigate the effectiveness of encapsulated and encapsulated/buried ducts in reducing thermal losses and gains from ductwork in unconditioned attics. Burying ductwork beneath loose-fill insulation has been identified as an effective method of reducing thermal losses and gains from ductwork in dry climates, but it is not applicable in humid climates where condensation may occur on the outside of the duct jacket. By encapsulating the ductwork in closed cell polyurethane foam (ccSPF) before burial beneath loose-fill mineral fiber insulation, the condensation potential may be reduced while increasing the R-value of the ductwork.

Shapiro, C.; Magee, A.; Zoeller, W.

2013-02-01T23:59:59.000Z

465

Glossary | Building Energy Codes Program  

NLE Websites -- All DOE Office Websites (Extended Search)

C-Factor C-Factor Time rate of steady-state heat flow through the unit area of a material or construction surfaces. Units of C-Factor are Btu/h x ft2 x degrees Fahrenheit. Note that the C-factor does not include soil or air films. CABO The Council of American Building Officials. Cavity Insulation Insulation installed between structural members such as wood studs, metal framing, and Z-clips. CDD Cooling degree day. See "Cooling Degree Days." CDD50 Cooling degree days base 50°F. See "Degree Day Base 50F." CE Combustion efficiency. Ceiling The ceiling requirements apply to portions of the roof and/or ceiling through which heat flows. Ceiling components include the interior surface of flat ceilings below attics, the interior surface of cathedral or vaulted

466

Building Envelope Research | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Building Envelope Research Building Envelope Research Building Envelope Research The Emerging Technology team conducts research into technologies and processes related to the building envelope. The goal of these efforts is to help reduce the amount of energy used in the building envelope by 20% compared to 2010 levels. By partnering with industry, researchers, and other stakeholders, the Department of Energy acts as a catalyst in developing new materials, coatings, and systems designed to improve energy efficiency. Research in building envelope technologies includes: Foundations Insulation Roofing and Attics Walls Foundations Photo of the concrete foundation of a building that's under construction