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Note: This page contains sample records for the topic "loop ground source" from the National Library of EnergyBeta (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

Performance analysis of a two-stage variable capacity air source heat pump and a horizontal loop coupled ground source heat pump system.  

E-Print Network (OSTI)

??The thermal performance of a new two-stage variable capacity air source heat pump (ASHP) and a horizontal ground loop ground source heat pump (GSHP) was… (more)

Safa, Amir Alizadeh

2012-01-01T23:59:59.000Z

2

Ground Source Heat Pump Sub-Slab Heat Exchange Loop Performance in a Cold Climate  

SciTech Connect

This report presents a cold-climate project that examines an alternative approach to ground source heat pump (GSHP) ground loop design. The innovative ground loop design is an attempt to reduce the installed cost of the ground loop heat exchange portion of the system by containing the entire ground loop within the excavated location beneath the basement slab. Prior to the installation and operation of the sub-slab heat exchanger, energy modeling using TRNSYS software and concurrent design efforts were performed to determine the size and orientation of the system. One key parameter in the design is the installation of the GSHP in a low-load home, which considerably reduces the needed capacity of the ground loop heat exchanger. This report analyzes data from two cooling seasons and one heating season. Upon completion of the monitoring phase, measurements revealed that the initial TRNSYS simulated horizontal sub-slab ground loop heat exchanger fluid temperatures and heat transfer rates differed from the measured values. To determine the cause of this discrepancy, an updated model was developed utilizing a new TRNSYS subroutine for simulating sub-slab heat exchangers. Measurements of fluid temperature, soil temperature, and heat transfer were used to validate the updated model.

Mittereder, N.; Poerschke, A.

2013-11-01T23:59:59.000Z

3

Building Energy Software Tools Directory: Ground Loop Design  

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

Loop Design Ground Loop Design logo Ground Loop Design is a versatile ground source heat pump system design program that helps the trained geothermal HVAC designerengineer...

4

Ground Loops for Heat Pumps and Refrigeration  

E-Print Network (OSTI)

Ground loops are used for water source heat pumps. Refrigeration can be put on a ground loop. Water-cooled condensing units are more efficient than air-cooled, and they can be put indoors. Indoor location makes piping for desuperheater hot water easy. Since refrigeration equipment runs more than heat pumps, energy savings can be large for ground-coupled refrigeration. The paper presents a design procedure for ground loops for heat pumps, hot water, ice machines, and water-cooled refrigeration. It gives an overview of the commercial ground-coupled systems in Louisiana that have both refrigeration and heat pumps. Systems vary from small offices to a three-story office building with 187 tons. A chain of hamburger outlets uses total ground-coupling in all of its stores. A grocery store has ground-coupling for heat pumps and refrigeration. Desuperheaters provide 80 percent of the hot water for a coin laundry in the same building. A comparison of energy costs in a bank with a ground-coupled heat pump system to a similar bank with air-conditioning and gas for heat revealed a 31 percent reduction in utility costs for the ground-coupled building. Two buildings of the Mississippi Power and Light Co. have ground-coupled heat pumps in one, and high efficiency air source heat pumps in the other. Energy savings in nine months was 60,000 kWh (25 percent), and electric peak demand was reduced 42 kW (35 percent).

Braud, H. J.

1986-01-01T23:59:59.000Z

5

Ground Source Heat Pumps Ground source heat pumps (GSHPs) use the earth's  

E-Print Network (OSTI)

Ground Source Heat Pumps Fact Sheet Ground source heat pumps (GSHPs) use the earth's constant. Waste heat can be used to heat hot water. System Types There are two types of ground source heat pumps, closed loop and open loop systems. Closed loop heat pumps use the earth as the heat source and heat sink

Paulsson, Johan

6

Geothermal Ground-Loop Preinstallation Project at Walden Pond  

Science Conference Proceedings (OSTI)

Geothermal ground-source heat pumps can help utilities increase electricity sales while reducing peak demands, but high ground-loop installation costs are a barrier to widespread acceptance. This project, conducted with Public Service Company of Indiana, demonstrated that mass installation of ground loops in a residential subdivision prior to home construction can substantially reduce installed cost for both horizontal and vertical loop configurations.

1990-09-05T23:59:59.000Z

7

Building Energy Software Tools Directory: Ground Loop Design  

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

Ground Loop Design Ground Loop Design Ground Loop Design logo Ground Loop Design is a versatile ground source heat pump system design program that helps the trained geothermal HVAC designer/engineer size equipment, determine the correct lengths of bore or pipe required for commercial projects, optimize the piping configuration for balanced flow and optimal heat transfer, and calculate the annual and lifetime energy/operating/emissions costs associated with the design. The modular program enhances design productivity and permits flexibility in the designing process and customization based on designer preferences. It also has an English/metric conversion engine and is available in many languages, providing applicability to the widest range of equipment and customers. Screen Shots

8

Development of an integrated building load-ground source heat pump model as a test bed to assess short- and long-term heat pump and ground loop performance.  

E-Print Network (OSTI)

??Ground source heat pumps (GSHP) have the ability to significantly reduce the energy required to heat and cool buildings. Historically, deployment of GSHP's in the… (more)

Gaspredes, Jonathan Louis

2012-01-01T23:59:59.000Z

9

New and Underutilized Technology: Commercial Ground Source Heat Pumps |  

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

Commercial Ground Source Heat Commercial Ground Source Heat Pumps New and Underutilized Technology: Commercial Ground Source Heat Pumps October 8, 2013 - 2:59pm Addthis The following information outlines key deployment considerations for commercial ground source heat pumps within the Federal sector. Benefits Commercial ground source heat pumps are ground source heat pump with loops that feed multiple packaged heat pumps and a single ground source water loop. Unit capacity is typically 1-10 tons and may be utilized in an array of multiple units to serve a large load. Application Condensing boilers are appropriate for housing, service, office, and research and development applications. Key Factors for Deployment FEMP has made great progress with commercial ground source heat pump technology deployment within the Federal sector. Primary barriers deal with

10

Study of Operating Control Strategies for Hybrid Ground Source Heat Pump System with Supplemental Cooling Tower  

Science Conference Proceedings (OSTI)

Ground source heat pump for cooling-dominated commercial buildings may utilize supplemental cooling towers to reduce system first cost and to improve system performance. The use of hybrid ground source heat pump (HGSP) can reduce the size of the ground-loop ... Keywords: hybrid ground source heat pump, supplement heat rejection, control strategies, operating performance

Wang Jinggang; Gao Xiaoxia; Yin Zhenjiang; Li Fang

2009-07-01T23:59:59.000Z

11

Optimal Design for a Hybrid Ground-Source Heat Pump  

E-Print Network (OSTI)

Although the advantages of ground-source heat pumps over their conventional alternatives make these systems a very attractive choice for air conditioning, not only for residential buildings but increasingly also for institutional and commercial buildings, a significant barrier to wider application of this technology is a high first cost. When used in cooling-dominated buildings, ground-source heat pumps that utilize vertical, closed-loop ground heat exchangers can experience performance degradation as the entering fluid temperature to the heat pump increases over time due to heat buildup in the borefield. In these cases, it is possible to displace a large portion of the system cost by installing a supplemental heat rejecter to balance the annual heat extraction from the ground. The paper presented has shown that the heat rejection of the GLHEs and the system energy consumption are approached to discuss the ground heat balance with different design procedures and control strategies though the system simulation.

Yu, Z.; Yuan, X.; Wang, B.

2006-01-01T23:59:59.000Z

12

Ground Source Heat Pumps | Open Energy Information  

Open Energy Info (EERE)

Ground Source Heat Pumps Ground Source Heat Pumps (Redirected from Geothermal Heat Pumps) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Ground Source Heat Pumps Geothermal Technologies There are many types of Geothermal Technologies that take advantage of the earth's heat: Hydrothermal Systems Enhanced Geothermal Systems (EGS) Sedimentary Geothermal Systems Co-Produced Geothermal Systems Geothermal Direct Use Ground Source Heat Pumps GSHP Links Related documents and websites An Information Survival Kit for the Prospective Geothemral Heat Pump Owner List of Heat Pumps Incentives List of Ground Source Heat Pumps Incentives Policy Makers' Guidebook for Geothermal Heating and Cooling Various ways to configure a geothermal heat pump system. (Source: The Geo-Heat Center's Survival Kit for the Prospective Geothemral Heat Pump

13

Ground Source Heat Pumps | Open Energy Information  

Open Energy Info (EERE)

Ground Source Heat Pumps Ground Source Heat Pumps Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Ground Source Heat Pumps Geothermal Technologies There are many types of Geothermal Technologies that take advantage of the earth's heat: Hydrothermal Systems Enhanced Geothermal Systems (EGS) Sedimentary Geothermal Systems Co-Produced Geothermal Systems Geothermal Direct Use Ground Source Heat Pumps GSHP Links Related documents and websites An Information Survival Kit for the Prospective Geothemral Heat Pump Owner List of Heat Pumps Incentives List of Ground Source Heat Pumps Incentives Policy Makers' Guidebook for Geothermal Heating and Cooling Various ways to configure a geothermal heat pump system. (Source: The Geo-Heat Center's Survival Kit for the Prospective Geothemral Heat Pump

14

Applicability of Related Data, Algorithms, and Models to the Simulation of Ground-Coupled Residential Hot Water Piping in California  

E-Print Network (OSTI)

Length Design for Ground Source Heat Pumps. ” InternationalClosed-Loop/Ground-Source Heat Pump Systems Installationon Closed-Loop Ground-Source Heat Pump Systems. ” ASHRAE

Warner, J.L.

2009-01-01T23:59:59.000Z

15

MODELING OF VERTICAL GROUND LOOP HEAT EXCHANGERS FOR GROUND SOURCE  

E-Print Network (OSTI)

for cooling-dominated commercial buildings utilize supplemental heat rejecters such as cooling towers, fluid of supplemental heat rejecters for cooling dominated buildings allows the design of smaller borehole fields. Heat

16

Recovery Act - Geothermal Technologies Program:Ground Source...  

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

Recovery Act - Geothermal Technologies Program:Ground Source Heat Pumps Recovery Act - Geothermal Technologies Program:Ground Source Heat Pumps A detailled description of the...

17

Simulation of Hybrid Ground Source Heat Pump Systems and Experimental Validation  

E-Print Network (OSTI)

Hybrid ground source heat pump systems incorporate both ground loop heat exchangers and auxiliary heat rejecters, such as cooling towers, fluid coolers, cooling ponds, or pavement heating systems. The design of the hybrid ground source heat pump system involves many degrees of freedom; e.g. the size of the cooling tower interacts with the control strategy, the ground loop heat exchanger design, and other parameters. This paper presents a simulation of such a system using a direct contact evaporative cooling tower as the supplemental heat rejecter. The simulation is performed in a component-based modeling environment using component models of a vertical ground loop heat exchanger, plate frame heat exchanger, cooling tower, circulating pumps, and heat pumps. Seven months (March to September 2005) of five-minutely experimental data from a hybrid ground source heat pump system were used for validation purposes. The source side of the system consists of two packaged water-to-water heat pumps, a three-borehole ground loop heat exchanger, and a direct contact evaporative cooling tower, isolated by a plate frame heat exchanger. The load side serves two small buildings with hydronic heating and cooling. Experimental validations of each component simulation and the entire system simulation are presented.

Jason E. Gentry; Jeffrey D. Spitler; Daniel E. Fisher; Xiaowei Xu

2006-01-01T23:59:59.000Z

18

A capital cost comparison of commercial ground-source heat pump systems  

DOE Green Energy (OSTI)

The purpose of the report is to compare capital costs associated with the three designs of ground source heat pumps. Specifically, the costs considered are those associated with the heat source/heat sink or ground source portion of the system. In order to standardize the heat rejection over the three designs, it was assumed that the heat pump loop would operate at a temperature range of 85{degree} (to the heat pumps) to 95{degree} (from the heat pumps) under peak conditions. The assumption of constant loop temperature conditions for all three permits an apples-to-apples comparison of the alternatives.

Rafferty, K.

1994-06-01T23:59:59.000Z

19

Remote measurement of ground source emissivity  

SciTech Connect

The remote measurement of the emissivity of ground materials is of tremendous value in their identification and mapping. Traditional techniques use reflected solar radiation for this measurement for wavelengths shorter than 5 {mu}m. With the development of new techniques, the 10 Jim atmospheric transmission window might also be used for this purpose. Previous work using the multi-angle data acquisition technique demonstrated its utility to determine source thermal emission. Here we find the multi-angle technique can be used to determine the source specular reflectivity to {approximately}0.05 if there is very good system performance (NETD {approx} 0.01 K).

Henderson, J.R.

1995-07-01T23:59:59.000Z

20

Federal Energy Management Program: Covered Product Category: Ground-Source  

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

Ground-Source Heat Pumps to someone by E-mail Ground-Source Heat Pumps to someone by E-mail Share Federal Energy Management Program: Covered Product Category: Ground-Source Heat Pumps on Facebook Tweet about Federal Energy Management Program: Covered Product Category: Ground-Source Heat Pumps on Twitter Bookmark Federal Energy Management Program: Covered Product Category: Ground-Source Heat Pumps on Google Bookmark Federal Energy Management Program: Covered Product Category: Ground-Source Heat Pumps on Delicious Rank Federal Energy Management Program: Covered Product Category: Ground-Source Heat Pumps on Digg Find More places to share Federal Energy Management Program: Covered Product Category: Ground-Source Heat Pumps on AddThis.com... Energy-Efficient Products Federal Requirements Covered Product Categories

Note: This page contains sample records for the topic "loop ground source" 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

Building Technologies Office: Ground Source Heap Pump Data Mining Research  

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

Ground Source Heap Pump Ground Source Heap Pump Data Mining Research Project to someone by E-mail Share Building Technologies Office: Ground Source Heap Pump Data Mining Research Project on Facebook Tweet about Building Technologies Office: Ground Source Heap Pump Data Mining Research Project on Twitter Bookmark Building Technologies Office: Ground Source Heap Pump Data Mining Research Project on Google Bookmark Building Technologies Office: Ground Source Heap Pump Data Mining Research Project on Delicious Rank Building Technologies Office: Ground Source Heap Pump Data Mining Research Project on Digg Find More places to share Building Technologies Office: Ground Source Heap Pump Data Mining Research Project on AddThis.com... About Take Action to Save Energy Partner with DOE Activities

22

Development of a Residential Ground-Source Integrated Heat Pump  

Science Conference Proceedings (OSTI)

A residential-size ground-source integrated heat pump (GSIHP) system has been developed and is currently being field tested. The system is a nominal 2-ton (7 kW) cooling capacity, variable-speed unit, which is multi-functional, e.g. space cooling, space heating, dedicated water heating, and simultaneous space cooling and water heating. High-efficiency brushless permanent-magnet (BPM) motors are used for the compressor, indoor blower, and pumps to obtain the highest component performance and system control flexibility. Laboratory test data were used to calibrate a vapor-compression simulation model (HPDM) for each of the four primary modes of operation. The model was used to optimize the internal control options and to simulate the selected internal control strategies, such as controlling to a constant air supply temperature in the space heating mode and a fixed water temperature rise in water heating modes. Equipment performance maps were generated for each operation mode as functions of all independent variables for use in TRNSYS annual energy simulations. These were performed for the GSIHP installed in a well-insulated 2600 ft2(242 m2) house and connected to a vertical ground loop heat exchanger(GLHE). We selected a 13 SEER (3.8 CSPF )/7.7 HSPF (2.3 HSPF, W/W) ASHP unit with 0.90 Energy Factor (EF) resistance water heater as the baseline for energy savings comparisons. The annual energy simulations were conducted over five US climate zones. In addition, appropriate ground loop sizes were determined for each location to meet 10-year minimum and maximum design entering water temperatures (EWTs) to the equipment. The prototype GSIHP system was predicted to use 52 to 59% less energy than the baseline system while meeting total annual space conditioning and water heating loads.

Rice, C Keith [ORNL; Baxter, Van D [ORNL; Hern, Shawn [ClimateMaster, Inc.; McDowell, Tim [Thermal Energy System Specialists, LLC; Munk, Jeffrey D [ORNL; Shen, Bo [ORNL

2013-01-01T23:59:59.000Z

23

Definition: Ground Source Heat Pumps | Open Energy Information  

Open Energy Info (EERE)

Pumps Pumps Jump to: navigation, search Dictionary.png Ground Source Heat Pumps A Ground Source Heat Pump is a central building heating and/or cooling system that takes advantage of the relatively constant year-round ground temperature to pump heat to or from the ground.[1][2][3] View on Wikipedia Wikipedia Definition A geothermal heat pump or ground source heat pump (GSHP) is a central heating and/or cooling system that pumps heat to or from the ground. It uses the earth as a heat source (in the winter) or a heat sink (in the summer). This design takes advantage of the moderate temperatures in the ground to boost efficiency and reduce the operational costs of heating and cooling systems, and may be combined with solar heating to form a geosolar system with even greater efficiency. Ground source heat pumps

24

Comparison of energy efficiency between variable refrigerant flow systems and ground source heat pump systems  

E-Print Network (OSTI)

Performance of ground source heat pump system in a near-zerosimulation tool for ground- source heat pump system designflow systems and ground source heat pump systems Abstract

Hong, Tainzhen

2010-01-01T23:59:59.000Z

25

Ground and Water Source Heat Pump Performance and Design for Southern Climates  

E-Print Network (OSTI)

Ground and water source heat pump systems have very attractive performance characteristics when properly designed and installed. These systems typically consist of a water-to-air or water-to-water heat pump linked to a closed loop vertical or horizontal ground-coupling, an open groundwater loop, or a surface water loop. This paper discusses system performance characteristics, component selection procedures presently being used, improvements currently being considered and future possibilities for improved efficiency and reliability. Optimum designs require proper matching of the heat pump unit to the water circulation system, the building space heating/cooling load and water heating requirements. General trends resulting from system and component choices will be discussed. Water heating methods with these heat pumps will be considered.

Kavanaugh, S.

1988-01-01T23:59:59.000Z

26

Combined permeable pavement and ground source heat pump systems.  

E-Print Network (OSTI)

??The PhD thesis focuses on the performance assessment of permeable pavement systems incorporating ground source heat pumps (GSHP). The relatively high variability of temperature in… (more)

Grabowiecki, Piotr

2010-01-01T23:59:59.000Z

27

EVALUATION AND OPTIMIZATION RESEARCH OF GROUND SOURCE HEAT PUMP.  

E-Print Network (OSTI)

??Nowadays energy efficiency and environmental protection have got particular attention. After the sustainable development theory had been put forward decades ago. Ground source heat pump… (more)

Zhou, Taian

2011-01-01T23:59:59.000Z

28

Ground-Source Heat Pumps Applied to Commercial Buildings  

SciTech Connect

Ground-source heat pumps can provide an energy-efficient, cost-effective way to heat and cool commercial facilities. While ground-source heat pumps are well established in the residential sector, their application in larger, commercial-style, facilities is lagging, in part because of a lack of experience with the technology by those in decision-making positions. Through the use of a ground-coupling system, a conventional water-source heat pump design is transformed to a unique means of utilizing thermodynamic properties of earth and groundwater for efficient operation throughout the year in most climates. In essence, the ground (or groundwater) serves as a heat source during winter operation and a heat sink for summer cooling. Many varieties in design are available, so the technology can be adapted to almost any site. Ground-source heat pump systems can be used widely in commercial-building applications and, with proper installation, offer great potential for the commercial sector, where increased efficiency and reduced heating and cooling costs are important. Ground-source heat pump systems require less refrigerant than conventional air-source heat pumps or air-conditioning systems, with the exception of direct-expansion-type ground-source heat pump systems. This chapter provides information and procedures that an energy manager can use to evaluate most ground-source heat pump applications. Ground-source heat pump operation, system types, design variations, energy savings, and other benefits are explained. Guidelines are provided for appropriate application and installation. Two case studies are presented to give the reader a sense of the actual costs and energy savings. A list of manufacturers and references for further reading are included for prospective users who have specific or highly technical questions not fully addressed in this chapter. Sample case spreadsheets are provided in Appendix A. Additional appendixes provide other information on the ground-source heat pump technology.

Parker, Steven A.; Hadley, Donald L.

2006-12-31T23:59:59.000Z

29

Ground-source Heat Pumps Applied to Commercial Buildings  

SciTech Connect

Ground-source heat pumps can provide an energy-efficient, cost-effective way to heat and cool commercial facilities. While ground-source heat pumps are well established in the residential sector, their application in larger, commercial-style, facilities is lagging, in part because of a lack of experience with the technology by those in decision-making positions. Through the use of a ground-coupling system, a conventional water-source heat pump design is transformed to a unique means of utilizing thermodynamic properties of earth and groundwater for efficient operation throughout the year in most climates. In essence, the ground (or groundwater) serves as a heat source during winter operation and a heat sink for summer cooling. Many varieties in design are available, so the technology can be adapted to almost any site. Ground-source heat pump systems can be used widely in commercial-building applications and, with proper installation, offer great potential for the commercial sector, where increased efficiency and reduced heating and cooling costs are important. Ground-source heat pump systems require less refrigerant than conventional air-source heat pumps or air-conditioning systems, with the exception of direct-expansion-type ground-source heat pump systems. This chapter provides information and procedures that an energy manager can use to evaluate most ground-source heat pump applications. Ground-source heat pump operation, system types, design variations, energy savings, and other benefits are explained. Guidelines are provided for appropriate application and installation. Two case studies are presented to give the reader a sense of the actual costs and energy savings. A list of manufacturers and references for further reading are included for prospective users who have specific or highly technical questions not fully addressed in this chapter. Sample case spreadsheets are provided in Appendix A. Additional appendixes provide other information on the ground-source heat pump technology.

Parker, Steven A.; Hadley, Donald L.

2009-07-14T23:59:59.000Z

30

Hybrid Ground Source Heat Pump System Simulation Using Visual Modeling Tool For Hvacsim  

E-Print Network (OSTI)

This paper presents a simulation of a hybrid ground source heat pump system, performed using a new graphical user interface for HVACSIM+. Hybrid ground source heat pump systems incorporate both ground loop heat exchangers and supplemental heat rejecters, such as cooling towers, cooling ponds, or pavement heating systems. HVACSIM+ capabilities have recently been extended by the addition of ground loop heat exchanger models, water-to-water and waterto-air heat pump models, pavement heating system models, and heat rejection pond models. New component models are discussed and a hybrid ground source heat pump system with heated pavement as a supplemental cooler is simulated using the visual modeling tool. First, though, an introduction to a new graphical user interface for HVACSIM+ is given. The user interface that originally came with the program could not be characterized as user-friendly. The new graphical interface allows users to develop system models by hooking components together. Provisions for controlling the simulation, setting the component parameters, editing the boundary file, and plotting the output are also included.

M. H. Khan; A. Varanasi; J. D. Spitler; D. E. Fisher; R. D. Delahoussaye

2003-01-01T23:59:59.000Z

31

Super Energy Saver Ground Source Heat Pump  

Source: US Energy Information Administration . 11 Managed by UT-Battelle for the U.S. Department of Energy ... GSHPs are very energy efficient, and the market is

32

Ground Source Heat Pump System Data Analysis  

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

Peer Review Peer Review GSHP System Data Analysis Xiaobing Liu, Ph.D. Oak Ridge National Laboratory liux2@ornl.gov (865-574-2593) 4/3/2013 - GSHP Data Analysis in 1 st phase of U.S.-China CERC-BEE - GSHP ARRA Grantee Data Mining 2 | Building Technologies Office eere.energy.gov Purpose & Objectives Problem Statement: High first cost of ground heat exchangers (GHXs) and lack of knowledge/trust in achievable benefits are major barriers preventing

33

Ground Source Heat Pump System Data Analysis  

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

Peer Review Peer Review GSHP System Data Analysis Xiaobing Liu, Ph.D. Oak Ridge National Laboratory liux2@ornl.gov (865-574-2593) 4/3/2013 - GSHP Data Analysis in 1 st phase of U.S.-China CERC-BEE - GSHP ARRA Grantee Data Mining 2 | Building Technologies Office eere.energy.gov Purpose & Objectives Problem Statement: High first cost of ground heat exchangers (GHXs) and lack of knowledge/trust in achievable benefits are major barriers preventing

34

Ground-Source Heat Pumps for Domestic and Commercial Applications...  

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

Ground-Source Heat Pumps for Domestic and Commercial Applications in Europe Speaker(s): Gran Hellstrm Date: May 2, 2006 - 12:00pm Location: Bldg. 90 Seminar HostPoint of...

35

Field Test of High Efficiency Residential Buildings with Ground-source and Air-source Heat Pump Systems  

SciTech Connect

This paper describes the field performance of space conditioning and water heating equipment in four single-family residential structures with advanced thermal envelopes. Each structure features a different, advanced thermal envelope design: structural insulated panel (SIP); optimum value framing (OVF); insulation with embedded phase change materials (PCM) for thermal storage; and exterior insulation finish system (EIFS). Three of the homes feature ground-source heat pumps (GSHPs) for space conditioning and water heating while the fourth has a two-capacity air-source heat pump (ASHP) and a heat pump water heater (HPWH). Two of the GCHP-equipped homes feature horizontal ground heat exchange (GHX) loops that utillize the existing foundation and utility service trenches while the third features a vertical borehole with vertical u-tube GHX. All of the houses were operated under the same simulated occupancy conditions. Operational data on the house HVAC/Water heating (WH) systems are presented and factors influencing overall performance are summarized.

Ally, Moonis Raza [ORNL; Munk, Jeffrey D [ORNL; Baxter, Van D [ORNL

2011-01-01T23:59:59.000Z

36

Long Term Geothermal Heat Pump System Ground Loop Heat Exchanger Performance: Field Data from a Quick Service Restaurant Application  

Science Conference Proceedings (OSTI)

This report summarizes measured long-term performance of the ground loop heat exchanger in a geothermal heat pump system in a McDonald's Quick Service Restaurant located in Westland near Detroit, Michigan. Heat build-up in the soil around the heat exchanger over a long period of time has always been a concern, but only limited data has been available in the past. The gradual increase in the return loop temperature over a period of five years is evidence of the heat built up in the ground loop field, whic...

2003-01-22T23:59:59.000Z

37

Random Analysis on Line-Heat Source Temperature Field of Ground Source Heat Pumps Buried Pipes  

Science Conference Proceedings (OSTI)

In this paper the random properties of ground-source heat pump (GSHP) system.GSHP buried pipe to Kelvin one-dimensional line source of heat transfer model are discussed. The model randomness is analyzed, and the GSHP buried pipe to random excess temperature ... Keywords: GSHP, Buriedpipe, Line-heat source, Temperature field, Correlation

Changsheng Guan; Zhuodong Liu; Kai Xia; Xuyi Chen

2009-05-01T23:59:59.000Z

38

HYBRID GROUND SOURCE HEAT PUMP SYSTEM SIMULATION USING VISUAL MODELING TOOL FOR HVACSIM+  

E-Print Network (OSTI)

incorporate both ground loop heat exchangers and supplemental heat rejecters, such as cooling towers, cooling-to-air heat pump (Yavuzturk 2000), heated pavement systems (Chiasson, et al. 2000a), shallow cooling ponds

39

Ground-source heat pump case studies and utility programs  

DOE Green Energy (OSTI)

Ground-source heat pump systems are one of the promising new energy technologies that has shown rapid increase in usage over the past ten years in the United States. These systems offer substantial benefits to consumers and utilities in energy (kWh) and demand (kW) savings. The purpose of this study was to determine what existing monitored data was available mainly from electric utilities on heat pump performance, energy savings and demand reduction for residential, school and commercial building applications. In order to verify the performance, information was collected for 253 case studies from mainly utilities throughout the United States. The case studies were compiled into a database. The database was organized into general information, system information, ground system information, system performance, and additional information. Information was developed on the status of demand-side management of ground-source heat pump programs for about 60 electric utility and rural electric cooperatives on marketing, incentive programs, barriers to market penetration, number units installed in service area, and benefits.

Lienau, P.J.; Boyd, T.L.; Rogers, R.L.

1995-04-01T23:59:59.000Z

40

Finite Volume Based Computer Program for Ground Source Heat Pump System  

SciTech Connect

This report is a compilation of the work that has been done on the grant DE-EE0002805 entitled ?Finite Volume Based Computer Program for Ground Source Heat Pump Systems.? The goal of this project was to develop a detailed computer simulation tool for GSHP (ground source heat pump) heating and cooling systems. Two such tools were developed as part of this DOE (Department of Energy) grant; the first is a two-dimensional computer program called GEO2D and the second is a three-dimensional computer program called GEO3D. Both of these simulation tools provide an extensive array of results to the user. A unique aspect of both these simulation tools is the complete temperature profile information calculated and presented. Complete temperature profiles throughout the ground, casing, tube wall, and fluid are provided as a function of time. The fluid temperatures from and to the heat pump, as a function of time, are also provided. In addition to temperature information, detailed heat rate information at several locations as a function of time is determined. Heat rates between the heat pump and the building indoor environment, between the working fluid and the heat pump, and between the working fluid and the ground are computed. The heat rates between the ground and the working fluid are calculated as a function time and position along the ground loop. The heating and cooling loads of the building being fitted with a GSHP are determined with the computer program developed by DOE called ENERGYPLUS. Lastly COP (coefficient of performance) results as a function of time are provided. Both the two-dimensional and three-dimensional computer programs developed as part of this work are based upon a detailed finite volume solution of the energy equation for the ground and ground loop. Real heat pump characteristics are entered into the program and used to model the heat pump performance. Thus these computer tools simulate the coupled performance of the ground loop and the heat pump. The price paid for the three-dimensional detail is the large computational times required with GEO3D. The computational times required for GEO2D are reasonable, a few minutes for a 20 year simulation. For a similar simulation, GEO3D takes days of computational time. Because of the small simulation times with GEO2D, a number of attractive features have been added to it. GEO2D has a user friendly interface where inputs and outputs are all handled with GUI (graphical user interface) screens. These GUI screens make the program exceptionally easy to use. To make the program even easier to use a number of standard input options for the most common GSHP situations are provided to the user. For the expert user, the option still exists to enter their own detailed information. To further help designers and GSHP customers make decisions about a GSHP heating and cooling system, cost estimates are made by the program. These cost estimates include a payback period graph to show the user where their GSHP system pays for itself. These GSHP simulation tools should be a benefit to the advancement of GSHP systems.

Menart, James A. [Wright State University] [Wright State University

2013-02-22T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Recovery Act: Finite Volume Based Computer Program for Ground Source Heat Pump Systems  

SciTech Connect

This report is a compilation of the work that has been done on the grant DE-EE0002805 entitled ���¢��������Finite Volume Based Computer Program for Ground Source Heat Pump Systems.���¢������� The goal of this project was to develop a detailed computer simulation tool for GSHP (ground source heat pump) heating and cooling systems. Two such tools were developed as part of this DOE (Department of Energy) grant; the first is a two-dimensional computer program called GEO2D and the second is a three-dimensional computer program called GEO3D. Both of these simulation tools provide an extensive array of results to the user. A unique aspect of both these simulation tools is the complete temperature profile information calculated and presented. Complete temperature profiles throughout the ground, casing, tube wall, and fluid are provided as a function of time. The fluid temperatures from and to the heat pump, as a function of time, are also provided. In addition to temperature information, detailed heat rate information at several locations as a function of time is determined. Heat rates between the heat pump and the building indoor environment, between the working fluid and the heat pump, and between the working fluid and the ground are computed. The heat rates between the ground and the working fluid are calculated as a function time and position along the ground loop. The heating and cooling loads of the building being fitted with a GSHP are determined with the computer program developed by DOE called ENERGYPLUS. Lastly COP (coefficient of performance) results as a function of time are provided. Both the two-dimensional and three-dimensional computer programs developed as part of this work are based upon a detailed finite volume solution of the energy equation for the ground and ground loop. Real heat pump characteristics are entered into the program and used to model the heat pump performance. Thus these computer tools simulate the coupled performance of the ground loop and the heat pump. The price paid for the three-dimensional detail is the large computational times required with GEO3D. The computational times required for GEO2D are reasonable, a few minutes for a 20 year simulation. For a similar simulation, GEO3D takes days of computational time. Because of the small simulation times with GEO2D, a number of attractive features have been added to it. GEO2D has a user friendly interface where inputs and outputs are all handled with GUI (graphical user interface) screens. These GUI screens make the program exceptionally easy to use. To make the program even easier to use a number of standard input options for the most common GSHP situations are provided to the user. For the expert user, the option still exists to enter their own detailed information. To further help designers and GSHP customers make decisions about a GSHP heating and cooling system, cost estimates are made by the program. These cost estimates include a payback period graph to show the user where their GSHP system pays for itself. These GSHP simulation tools should be a benefit to the advancement of GSHP system

James A Menart, Professor

2013-02-22T23:59:59.000Z

42

Building Technologies Office: Recovery Act-Funded Ground Source Heat Pump  

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

Ground Source Heat Pump Demonstration Projects to someone by E-mail Ground Source Heat Pump Demonstration Projects to someone by E-mail Share Building Technologies Office: Recovery Act-Funded Ground Source Heat Pump Demonstration Projects on Facebook Tweet about Building Technologies Office: Recovery Act-Funded Ground Source Heat Pump Demonstration Projects on Twitter Bookmark Building Technologies Office: Recovery Act-Funded Ground Source Heat Pump Demonstration Projects on Google Bookmark Building Technologies Office: Recovery Act-Funded Ground Source Heat Pump Demonstration Projects on Delicious Rank Building Technologies Office: Recovery Act-Funded Ground Source Heat Pump Demonstration Projects on Digg Find More places to share Building Technologies Office: Recovery Act-Funded Ground Source Heat Pump Demonstration Projects on AddThis.com...

43

Multi-angle technique for measurement of ground source emission  

SciTech Connect

TAISIR, the Temperature and Imaging System Infrared, is a nominally satellite based platform for remote sensing of the earth. One of its design features is to acquire atmospheric data simultaneous with ground data, resulting in minimal dependence on external atmospheric models for data correction. One technique we employ to acquire atmospheric data is a true multi-angle data acquisition technique. Previous techniques have used only two angles. Here we demonstrate the advantage of using a large number of viewing angles to overconstrain the inversion problem for critical atmospheric and source parameters. For reasonable data acquisition scenarios, simulations show source temperature errors of less than 1K should be possible. Tradeoffs between flight geometry, number of look angles,, and system signal-to-noise are given for typical parameter ranges.

Henderson, J.R.

1995-04-01T23:59:59.000Z

44

Dispersion modeling of ground-level area sources of particulate  

E-Print Network (OSTI)

The use of dispersion modeling by State Air Pollution hics. Regulatory Agencies (SAPRAS) is increasing. Dispersion modeling provides a quick and efficient means of determining the downwind impact of pollutant release from a source. The SAPRAS are charged with the task of insuring that public exposure levels of these pollutants are less than the standards set by the United States Environmental Protection Agency (US EPA). Estimating the concentration of pollutant at some distance downwind, in most cases the property line, allows that SAPRAS to determine whether or not a source needs to install additional means of control in order to decrease the rate of pollutant release. One set of models approved for regulatory use by the US EPA is Industrial Source Complex (ISC). ISC includes SCREEN: which is a simple screening model with imbedded meteorological data, and ST3 which is a more refined model requiring meteorological data to be provided. ISC models are based on the concept of Gaussian dispersion. The concentration determined using the ISC models are a result of determining concentrations based on a single wind speed and direction for a one hour time period. The first step in the formulation of a new model was to incorporate smaller time periods into the concentration predictions, in order to account for variation or wind speed and direction within an hour period. For ground-level sources, the vertical distribution involves mathematically dispersing the pollutant underground, then reflecting it back up. The next step taken in the new model development was the incorporation of a triangular distribution in the Medical plane. The triangular distribution is entirely above ground. Once the new model was formulated, a sample modeling procedure was performed in order to compare the behavior of the new model as compared to ISC ST3. Examination of the characteristics of the two models, the meteorological data, and the output from the modeling procedures allows the comparison and contrast of the behavioral characteristics of the two models.

Fritz, Bradley Keith

1998-01-01T23:59:59.000Z

45

Modeling and Experimental Research on Ground-Source Heat Pump in Operation by Neural Network  

Science Conference Proceedings (OSTI)

Ground source Heat Pump(GSHP) is becoming the more and more focus of the worldˇŻs attention as a HVAC technique of energy saving and environment protection. This paper first introduced the experiment for Ground-Source water/water Heat Pump. The heat ... Keywords: Ground-Source Heat Pump(GSHP), Neural Network(NN) Predication modeling

Jianping Chen; Zhiwei Lian; Lizheng Tan; Weifeng Zhu; Weiqiang Zhang

2011-02-01T23:59:59.000Z

46

Advanced modeling of vertical ground source heat pumps using finite element techniques.  

E-Print Network (OSTI)

??Increasing energy demand and environmental pollution in United States has been led toward using renewable energy sources over recent decades. Ground-source heat pump systems are… (more)

Komari Zadeh, Seyed Omid

2011-01-01T23:59:59.000Z

47

Optimal Ground-Source Heat Pump System Design Geothermal Project...  

Open Energy Info (EERE)

design tool with a groundwater flow and heat transport modeling software allowing the modeling of vertical and pondlake loops in different climate zones and building types in the...

48

Evolution of the Loop-Top Source of Solar Flares--Heating and Cooling Processes  

E-Print Network (OSTI)

We present a study of the spatial and spectral evolution of the loop-top (LT) sources in a sample of 6 flares near the solar limb observed by {\\it RHESSI}. A distinct coronal source, which we identify as the LT source, was seen in each of these flares from the early ``pre-heating'' phase through the late decay phase. Spectral analyses reveal an evident steep power-law component in the pre-heating and impulsive phases, suggesting that the particle acceleration starts upon the onset of the flares. In the late decay phase the LT source has a thermal spectrum and appears to be confined within a small region near the top of the flare loop, and does not spread throughout the loop, as is observed at lower energies. The total energy of this source decreases usually faster than expected from the radiative cooling but much slower than that due to the classical Spitzer conductive cooling along the flare loop. These results indicate the presence of a distinct LT region, where the thermal conductivity is suppressed significantly and/or there is a continuous energy input. We suggest that plasma wave turbulence could play important roles in both heating the plasma and suppressing the conduction during the decay phase of solar flares. With a simple quasi-steady loop model we show that the energy input in the gradual phase can be comparable to that in the impulsive phase and demonstrate how the observed cooling and confinement of the LT source can be used to constrain the wave-particle interaction.

Yan Wei Jiang; Siming Liu; Wei Liu; Vahe Petrosian

2005-08-24T23:59:59.000Z

49

Exergy and Energy analysis of a ground-source heat pump for domestic water heating under simulated occupancy conditions  

SciTech Connect

This paper presents detailed analysis of a water to water ground source heat pump (WW-GSHP) to provide all the hot water needs in a 345 m2 house located in DOE climate zone 4 (mixed-humid). The protocol for hot water use is based on the Building America Research Benchmark Definition (Hendron 2008; Hendron and Engebrecht 2010) which aims to capture the living habits of the average American household and its impact on energy consumption. The entire house was operated under simulated occupancy conditions. Detailed energy and exergy analysis provides a complete set of information on system efficiency and sources of irreversibility, the main cause of wasted energy. The WW-GSHP was sized at 5.275 kW (1.5-ton) for this house and supplied hot water to a 303 L (80 gal) water storage tank. The WW-GSHP shared the same ground loop with a 7.56 kW (2.1-ton) water to air ground source heat pump (WA-GSHP) which provided space conditioning needs to the entire house. Data, analyses, and measures of performance for the WW-GSHP in this paper complements the results of the WA-GSHP published in this journal (Ally, Munk et al. 2012). Understanding the performance of GSHPs is vital if the ground is to be used as a viable renewable energy resource.

Ally, Moonis Raza [ORNL; Munk, Jeffrey D [ORNL; Baxter, Van D [ORNL; Gehl, Anthony C [ORNL

2012-01-01T23:59:59.000Z

50

Trends in "Green" Design - making ground source heat pumps the system of choice.  

E-Print Network (OSTI)

??Ground source heat pump systems have been around for nearly 50 years. The efficiencies that can be achieved today are difficult to match with any… (more)

Hasler, Fred L.

2008-01-01T23:59:59.000Z

51

Implementation and validation of a Ground Source Heat Pump model in MATLAB.  

E-Print Network (OSTI)

??The aim of the project is the implementation of a simple Ground-Source Heat Pump (GSHP) system model in MATLAB. The program is able to run… (more)

Casetta, Damien

2012-01-01T23:59:59.000Z

52

Dynamic modeling and control of hybrid ground source heat pump systems.  

E-Print Network (OSTI)

??Ground source heat pump (GSHP) systems are one of the fastest growing applications of renewable energy in the world with annual increases of 10% over… (more)

Chen, Chang

2008-01-01T23:59:59.000Z

53

Viability Of Hybrid Ground Source Heat Pump System With Solar Thermal Collectors.  

E-Print Network (OSTI)

??This thesis presents a study for examining the viability of hybrid ground source heat pump (GSHP) systems that use solar thermal collectors as the supplemental… (more)

Rad, Farzin M.

2009-01-01T23:59:59.000Z

54

Solar Colletors Combined with Ground-Source Heat Pumps in Dwellings - Analyses of System Performance.  

E-Print Network (OSTI)

??The use of ground-source heat pumps for heating buildings and domestic hot water in dwellings is increasing rapidly in Sweden. The heat pump extracts heat… (more)

Kjellsson, Elisabeth

2009-01-01T23:59:59.000Z

55

Comparison of energy efficiency between variable refrigerant flow systems and ground source heat pump systems  

E-Print Network (OSTI)

comparison of VAV and VRF air conditioning systems in anThe variable refrigerant flow (VRF) and ground source heatthe energy efficiency of VRF systems compared with GSHP

Hong, Tainzhen

2010-01-01T23:59:59.000Z

56

Ground Source Integrated Heat Pump (GS-IHP) Development  

SciTech Connect

Between October 2008 and May 2013 ORNL and ClimateMaster, Inc. (CM) engaged in a Cooperative Research and Development Agreement (CRADA) to develop a groundsource integrated heat pump (GS-IHP) system for the US residential market. A initial prototype was designed and fabricated, lab-tested, and modeled in TRNSYS (SOLAR Energy Laboratory, et al, 2010) to predict annual performance relative to 1) a baseline suite of equipment meeting minimum efficiency standards in effect in 2006 (combination of air-source heat pump (ASHP) and resistance water heater) and 2) a state-of-the-art (SOA) two-capacity ground-source heat pump with desuperheater water heater (WH) option (GSHPwDS). Predicted total annual energy savings, while providing space conditioning and water heating for a 2600 ft{sup 2} (242 m{sup 2}) house at 5 U.S. locations, ranged from 52 to 59%, averaging 55%, relative to the minimum efficiency suite. Predicted energy use for water heating was reduced 68 to 78% relative to resistance WH. Predicted total annual savings for the GSHPwDS relative to the same baseline averaged 22.6% with water heating energy use reduced by 10 to 30% from desuperheater contributions. The 1st generation (or alpha) prototype design for the GS-IHP was finalized in 2010 and field test samples were fabricated for testing by CM and by ORNL. Two of the alpha units were installed in 3700 ft{sup 2} (345 m{sup 2}) houses at the ZEBRAlliance site in Oak Ridge and field tested during 2011. Based on the steady-state performance demonstrated by the GS-IHPs it was projected that it would achieve >52% energy savings relative to the minimum efficiency suite at this specific site. A number of operational issues with the alpha units were identified indicating design changes needed to the system before market introduction could be accomplished. These were communicated to CM throughout the field test period. Based on the alpha unit test results and the diagnostic information coming from the field test experience, CM developed a 2nd generation (or beta) prototype in 2012. Field test verification units were fabricated and installed at the ZEBRAlliance site in Oak Ridge in May 2012 and at several sites near CM headquarters in Oklahoma. Field testing of the units continued through February 2013. Annual performance analyses of the beta unit (prototype 2) with vertical well ground heat exchangers (GHX) in 5 U.S. locations predict annual energy savings of 57% to 61%, averaging 59% relative to the minimum efficiency suite and 38% to 56%, averaging 46% relative to the SOA GSHPwDS. Based on the steady-state performance demonstrated by the test units it was projected that the 2nd generation units would achieve ~58% energy savings relative to the minimum efficiency suite at the Zebra Alliance site with horizontal GHX. A new product based on the beta unit design was announced by CM in 2012 – the Trilogy 40® Q-mode™ (http://cmdealernet.com/trilogy_40.html). The unit was formally introduced in a March 2012 press release (see Appendix A) and was available for order beginning in December 2012.

Baxter, V. D. [ORNL; Rice, K. [ORNL; Murphy, R. [ORNL; Munk, J. [ORNL; Ally, Moonis [ORNL; Shen, Bo [ORNL; Craddick, William [ORNL; Hearn, Shawn A. [ClimateMaster, Inc.

2013-05-24T23:59:59.000Z

57

Evaluation of cobalt sources in Westinghouse-designed three- and four-loop plants. Final report  

SciTech Connect

Sources of cobalt input in two typical Westinghouse-designed three- and four-loop plants are identified. Quantification of the sources was based on a detailed analysis of the construction materials. The best available information was used to establish the corrosion and wear release rates. This analysis concludes that approximately 70% of the cobalt input arises from corrosion release of Inconel steam generator tubing. Corrosion and wear of high-cobalt alloys account for about 25%. Recommendations are made concerning cobalt reduction options based on a cost-benefit analysis.

Bergmann, C.A.

1982-10-01T23:59:59.000Z

58

ANN and ANFIS models for performance evaluation of a vertical ground source heat pump system  

Science Conference Proceedings (OSTI)

The aim of this study is to demonstrate the comparison of an artificial neural network (ANN) and an adaptive neuro-fuzzy inference system (ANFIS) for the prediction performance of a vertical ground source heat pump (VGSHP) system. The VGSHP system using ... Keywords: Adaptive neuro-fuzzy inference system, Coefficient of performance, Ground source heat pump, Membership functions, Vertical heat exchanger

Hikmet Esen; Mustafa Inalli

2010-12-01T23:59:59.000Z

59

Study on Hybrid Solar Energy and Ground-Source Heat Pump System  

Science Conference Proceedings (OSTI)

Aim at the weakness of more influenced by the environment etc. factor and the heat flow density lower when the solar energy was make use of heating, so the design method of the hybrid solar energy and ground-source heat pump is proposed, and the operating ... Keywords: solar energy, ground-source, heat pump, coefficient of performance

Liu Yi; Li Bing-xi; Zhou Yi; Fu Zhong-bin; Xu Xin-hai

2009-10-01T23:59:59.000Z

60

Discussion of an Optimization Scheme for the Ground Source Heat Pump System of HVAC  

E-Print Network (OSTI)

With the implementation of the global sustainable development strategy, people pay more attention to renewable energy resources such as ground source heat pumps. The technology of ground source heat pump is widely applied to heat and cold. It is critical and important to know how to choose the terminal and make it workable. This paper makes a technical and economic comparison of various heating terminals (with the example of a north residential district which adopts ground source heat pump as the cold and heat source) and gets the optimum scheme.

Mu, W.; Wang, S.; Pan, S.; Shi, Y.

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Federal Technology Alert: Ground-Source Heat Pumps Applied to Federal Facilities--Second Edition  

SciTech Connect

This Federal Technology Alert, which was sponsored by the U.S. Department of Energy's Office of Federal Energy Management Programs, provides the detailed information and procedures that a Federal energy manager needs to evaluate most ground-source heat pump applications. This report updates an earlier report on ground-source heat pumps that was published in September 1995. In the current report, general benefits of this technology to the Federal sector are described, as are ground-source heat pump operation, system types, design variations, energy savings, and other benefits. In addition, information on current manufacturers, technology users, and references for further reading are provided.

Hadley, Donald L.

2001-03-01T23:59:59.000Z

62

Numerical simulation of multilayer grounding grids in a user-friendly open-source CAD interface  

E-Print Network (OSTI)

Numerical simulation of multilayer grounding grids in a user-friendly open-source CAD interface Jos application for the in-house computer aided design and analysis of grounding grids. The actual version the equivalent resistance and the step and touch voltage in most large electrical overground substations

Colominas, Ignasi

63

Utilization of near-source video and ground motion in the assessment of seismic source functions from mining explosions  

SciTech Connect

Constraint of the operative physical processes in the source region of mining explosions and the linkage to the generation of seismic waveforms provides the opportunity for controlling ground motion. Development of these physical models can also be used in conjunction with the ground motion data as diagnostics of blasting efficiency. In order to properly address the multi-dimensional aspect of data sets designed to constrain these sources, we are investigating a number of modem visualization tools that have only recently become available with new, high-speed graphical computers that can utilize relatively large data sets. The data sets that are combined in the study of mining explosion sources include near-source ground motion acceleration and velocity records, velocity of detonation measurements in each explosive hole, high speed film, video and shot design information.

Stump, B.W. [Los Alamos National Lab., NM (United States); Anderson, D.P. [Southern Methodist Univ., Dallas, TX (United States). Dept. of Geological Sciences

1995-04-01T23:59:59.000Z

64

Covered Product Category: Ground-Source Heat Pumps | Department of Energy  

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

Covered Product Category: Ground-Source Heat Pumps Covered Product Category: Ground-Source Heat Pumps Covered Product Category: Ground-Source Heat Pumps October 7, 2013 - 10:32am Addthis ENERGY STAR Qualified Products FEMP provides acquisition guidance across a variety of product categories, including ground-source heat pumps (GSHPs), 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. Most manufacturers display the ENERGY STAR label on complying models. For a model not displaying this label, check the manufacturer's literature to determine if it meets the efficiency requirements outlined by ENERGY STAR. Performance Requirements for Federal Purchases

65

Ground Source Heat Pump Data Mining Research Project | Department of Energy  

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

Ground Source Heat Pump Data Mining Ground Source Heat Pump Data Mining Research Project Ground Source Heat Pump Data Mining Research Project The U.S. Department of Energy is currently conducting research into ground source heat pump (GSHP) data mining. This project seeks to build public awareness of GSHP technology through the development of case studies outlining costs and benefits. Project Description This project seeks to produce in-depth case studies on the costs and benefits of American Recovery and Reinvestment Act -funded GSHP demonstration projects, including cross-cutting summaries of lessons learned and best practices for design, installation, and operation. Project Partners Research is being undertaken between the Department of Energy and Oak Ridge National Laboratory. Project Goals

66

Covered Product Category: Ground-Source Heat Pumps | Department of Energy  

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

Ground-Source Heat Pumps Ground-Source Heat Pumps Covered Product Category: Ground-Source Heat Pumps October 7, 2013 - 10:32am Addthis ENERGY STAR Qualified Products FEMP provides acquisition guidance across a variety of product categories, including ground-source heat pumps (GSHPs), 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. Most manufacturers display the ENERGY STAR label on complying models. For a model not displaying this label, check the manufacturer's literature to determine if it meets the efficiency requirements outlined by ENERGY STAR. Performance Requirements for Federal Purchases For the most up-to-date efficiency levels required by ENERGY STAR, look for

67

Heat transfer analysis of thermosiphons and U-tube ground source heat pumps.  

E-Print Network (OSTI)

??Ground source thermal energy transport systems have the potential to improve theefficiency of space heating.Two such systems, a thermosiphon and a vertical U-tube system, were… (more)

Nakaoka, Joshua

2012-01-01T23:59:59.000Z

68

Ground source heat storage and thermo-physical response of soft clay  

E-Print Network (OSTI)

Ground source heat storage can condition buildings with reduced consumption of fossil fuels, an important issue in modem building design. However, seasonal heat storage can cause soil temperature fluctuations and possibly ...

Saxe, Shoshanna Dawn

2009-01-01T23:59:59.000Z

69

ORNL/TM-2008/232 Geothermal (Ground-Source) Heat Pumps  

E-Print Network (OSTI)

pump water heater and ClimateMaster TrilogyTM 40 Q-ModeTM geothermal (ground- source) integrated heat buildings on the flexible research platforms. · The greatest barrier preventing wider use of geothermal

Oak Ridge National Laboratory

70

Informing the practice of ground heat exchanger design through numerical simulations.  

E-Print Network (OSTI)

??Closed-loop ground source heat pumps (GSHPs) are used to transfer thermal energy between the subsurface and conditioned spaces for heating and cooling applications. A basic… (more)

Haslam, Simon R.

2013-01-01T23:59:59.000Z

71

Efficient energy supply from ground coupled heat transfer source  

Science Conference Proceedings (OSTI)

The increasing demands of Energy for industrial production and urban facilities, asks for new strategies for Energy sources. In recent years an important problem is to have some energy storage, energy production and energy consumption which fulfill some ... Keywords: heat, thermal aquifer, thermal energy

Maurizio Carlini; Sonia Castellucci

2010-03-01T23:59:59.000Z

72

Supplemental heat rejection in ground source heat pumps for residential houses in Texas and other semi-arid regions.  

E-Print Network (OSTI)

??Ground source heat pumps (GSHP) are efficient alternatives to air source heat pumps to provide heating and cooling for conditioned buildings. GSHPs are widely deployed… (more)

Balasubramanian, Siddharth

2012-01-01T23:59:59.000Z

73

SIMULATION AND VALIDATION OF HYBRID GROUND SOURCE AND WATER-LOOP HEAT PUMP  

E-Print Network (OSTI)

.3 Plot of loads, operating heat pumps, and cooling tower setpoint for an office building in Albuquerque.20 Office building loads for Chicago.................................................................... 112 4.21 Office building loads for Houston

74

Measured Performance and Analysis of Ground Source Heat Pumps for Space Conditioning and for Water Heating in a Low-Energy Test House Operated under Simulated Occupancy Conditions  

Science Conference Proceedings (OSTI)

In this paper we present measured performance and efficiency metrics of Ground Source Heat Pumps (GSHPs) for space conditioning and for water heating connected to a horizontal ground heat exchanger (GHX) loop. The units were installed in a 345m2 (3700ft2) high-efficiency test house built with structural insulated panels (SIPs), operated under simulated occupancy conditions, and located in Oak Ridge, Tennessee (USA) in US Climate Zone 4 . The paper describes distinctive features of the building envelope, ground loop, and equipment, and provides detailed monthly performance of the GSHP system. Space conditioning needs of the house were completely satisfied by a nominal 2-ton (7.0 kW) water-to-air GSHP (WA-GSHP) unit with almost no auxiliary heat usage. Recommendations for further improvement through engineering design changes are identified. The comprehensive set of data and analyses demonstrate the feasibility and practicality of GSHPs in residential applications and their potential to help achieve source energy and greenhouse gas emission reduction targets set under the IECC 2012 Standard.

Ally, Moonis Raza [ORNL; Munk, Jeffrey D [ORNL; Baxter, Van D [ORNL; Gehl, Anthony C [ORNL

2012-01-01T23:59:59.000Z

75

Designing, selecting and installing a residential ground-source heat pump system  

Science Conference Proceedings (OSTI)

It's a compelling proposition: Use the near-constant-temperature heat underground to heat and cool your home and heat domestic water, slashing your energy bills. Yet despite studies demonstrating significant energy savings from ground-source heat pump (GSHP) systems, their adoption has been hindered by high upfront costs. Fewer than 1% of US homes use a GSHP system. However, compared to a minimum-code-compliant conventional space-conditioning system, when properly designed and installed, a GSHP retrofit at current market prices offers simple payback of 4.3 years on national average, considering existing federal tax credits. Most people understand how air-source heat pumps work: they move heat from indoor air to outdoor air when cooling and from outdoor air to indoor air when heating. The ground-source heat pump operates on the same principle, except that it moves heat to or from the ground source instead of outdoor air. The ground source is usually a vertical or horiontal ground heat exchanger. Because the ground usually has a more favorable temperature than ambient air for the heating and cooling operation of the vapor-compression refrigeration cycle, GSHP sysems can operate with much higher energy efficiencies than air-source heat pump systems when properly designed and installed. A GSHP system used in a residual building typically provides space conditioning and hot water and comprises three major components: a water-source heat pump unit designed to operate at a wider range of entering fluid temperatures (typically from 30 F to 110 F, or 1 C to 43 C) than a conventional water-source heat pump unit; a ground heat exchanger (GHX); and distribution systems to deliver hot water to the storage tank and heating or cooling to the conditioned rooms. In most residual GSHP systems, the circulation pumps and associated valves are integrated with the heat pump to circulate the heat-carrier fluid (water or aqueous antifreeze solution) through the heat pump and the GHX. A recent assessment indicates that if 20% of US homes replaced their existing space-conditioning and water-heating systems with properly designed, installed and operated state-of-the-art GSHP systems, it would yield significant benefits each year. These include 0.8 quad British thermal units (Btu) of primary energy savings, 54.3 million metric tons of CO{sub 2} emission reductions, $10.4 billion in energy cost savings and 43.2 gigawatts of reduction in summer peak electrical demand.

Hughes, Patrick [ORNL; Liu, Xiaobing [ORNL; Munk, Jeffrey D [ORNL

2010-01-01T23:59:59.000Z

76

Feasibility Study of Using Ground Source Heat Pumps in Two Buildings  

E-Print Network (OSTI)

. The building is located near the end of the central steam distribution system. Steam from the central steam and Mt. Olympus BOQ) presently heated by steam from the central steam plant. Ground source heat pump, it was assumed that natural gas-fired water heaters would replace the steam converters that presently provide hot

Oak Ridge National Laboratory

77

A Simple Analytic Approximation of the Ground-Level Concentration for Elevated Line Sources  

Science Conference Proceedings (OSTI)

By an analytical treatment of the advection-diffusion equation, the upper and lower bounds of the ground-level concentration (glc) have been found for a continuous, elevated line source. These two bounds have been used to construct a Fickian-type ...

Renzo Lupini; Tiziano Tirabassi

1981-05-01T23:59:59.000Z

78

Efficiency, Economic and Environmental Assessment of Ground Source Heat Pumps in Central Pennsylvania  

Science Conference Proceedings (OSTI)

The energy use of a ground-source heat pump (GSP) for heating, cooling and hot water in a Central Pennsylvania residence (namely, the author's house) is analyzed, compared to a simulation of electricity and a heating-oil furnace (with electric cooling) ...

2009-01-01T23:59:59.000Z

79

Research on the Applicability of Solar Energy-Ground Source Heat Pump in Different Regions of China  

Science Conference Proceedings (OSTI)

The development potential of solar energy resource, cLimatic characteristics and soil temperature conditions are various in different areas of China, which brings some difficulties in the promotion and appLication of solar energy-ground source heat pump ... Keywords: Solar energy-ground source heat pump (GSHP), Solar radiation, Sharacteristics of soil thermal storage, Geographic features

Dongyi Zhou; Chu-ping Shi; Wen-hua Yuan

2011-08-01T23:59:59.000Z

80

Ground-Source Heat Pumps Applied to Federal Facilities, Second Edition  

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

E E N E R G Y M A N A G E M E N T P R O G R A M and exterior to the facility, are typically less than those for conventional systems. Potential Application The technology has been shown to be techni- cally valid and economically attractive in many applications. It is efficient and effective. This Federal Technology Alert reports on the collec- tive experience of heat pump users and evalua- tors and provides application guidance. An estimated 400,000 ground-source heat pumps are operating in the private and public sector, although most of these systems operate in resi- dential applications. A ground-source heat pump system can be applied in virtually any category of climate or building. The large num- ber of installations testifies to the stability of this technology. The reported problems can

Note: This page contains sample records for the topic "loop ground source" 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

Application Analysis of Ground Source Heat Pumps in Building Space Conditioning  

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

Application Analysis of Ground Source Heat Application Analysis of Ground Source Heat Pumps in Building Space Conditioning Hua Qian 1,2 , Yungang Wang 2 1 School of Energy and Environment Southeast University Nanjing, 210096, China 2 Environmental Energy Technologies Division Lawrence Berkeley National Laboratory Berkeley, CA 94720, USA July 2013 The project was supported by National Key Technology Supported Program of China (2011BAJ03B10-1) and by the U.S. Department of Energy under Contract No. DE-AC02- 05CH11231. Disclaimer This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the

82

Ground-Source Heat Pumps Applied to Federal Facilities, Second Edition  

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

and exterior to the facility, are typically less and exterior to the facility, are typically less than those for conventional systems. Potential Application The technology has been shown to be techni- cally valid and economically attractive in many applications. It is efficient and effective. This Federal Technology Alert reports on the collec- tive experience of heat pump users and evalua- tors and provides application guidance. An estimated 400,000 ground-source heat pumps are operating in the private and public sector, although most of these systems operate in resi- dential applications. A ground-source heat pump system can be applied in virtually any category of climate or building. The large num- ber of installations testifies to the stability of this technology. The reported problems can usually be attributed to faulty design or

83

Study of the design Method of an Efficient Ground Source Heat Pump Thermal Source System in a Cold Area  

E-Print Network (OSTI)

The ground source heat pump (GSHP) system-an energy efficiency and environment friendly system-is becoming popular in many parts of China. However, an imbalance usually exists between the annual heat extracted from and rejected to the ground due to the different heating and cooling load of a building, which will consistently deteriorate the heat pump efficiency leading even to the breakdown of the heat pump. This paper brings forward a design method of adding supplemental heat rejection equipment, a cooling tower, in the system to solve the problem in a cold area. Taking an office building in Beijing as an example, the authors simulate the GSHP system with two different connection methods between the cooling tower and vertical buried-pipe heat exchangers (in series and in parallel) using TRNSYS simulation software, and put forward several design schemes that can ensure the whole system continually operates with high efficiency. This also makes it possible to perform a more detailed economic optimization of the GSHP-based system in the future.

Shu, H.; Duanmu, L.; Hua, R.; Zou, Y.; Du, G.

2006-01-01T23:59:59.000Z

84

Proposed Design for a Coupled Ground-Source Heat Pump/Energy Recovery Ventilator System to Reduce Building Energy Demand.  

E-Print Network (OSTI)

??The work presented in this thesis focuses on reducing the energy demand of a residential building by using a coupled ground-source heat pump/energy recovery ventilation… (more)

McDaniel, Matthew Lee

2011-01-01T23:59:59.000Z

85

A comparison of ground source heat pumps and micro-combined heat and power as residential greenhouse gas reduction strategies  

E-Print Network (OSTI)

Both ground source heat pumps operating on electricity and micro-combined heat and power systems operating on fossil fuels offer potential for the reduction of green house gas emissions in comparison to the conventional ...

Guyer, Brittany (Brittany Leigh)

2009-01-01T23:59:59.000Z

86

A Novel Integrated Frozen Soil Thermal Energy Storage and Ground-Source Heat Pump System  

E-Print Network (OSTI)

In this paper, a novel integrated frozen soil thermal energy storage and ground-source heat pump (IFSTS&GSHP) system in which the GHE can act as both cold thermal energy storage device and heat exchanger for GSHP is first presented. The IFSTS&GSHP system can serve as cold energy thermal storage at night, produce chilled water in the daytime in summer and provide hot water for heating in winter. This is followed by its schematic and characteristic description. Then the various operation modes of such system according to different operational strategies are demonstrated in sequence. The system, firstly seen in open literature, is energy-saving, environmental-friendly and promising in the field of air-conditioning systems, and will help solve the problems currently existing with the GSHP system and ITES air conditioning system.

Jiang, Y.; Yao, Y.; Rong, L.; Ma, Z.

2006-01-01T23:59:59.000Z

87

PARAMETRIC STUDY OF GROUND SOURCE HEAT PUMP SYSTEM FOR HOT AND HUMID CLMATE  

DOE Green Energy (OSTI)

The U-tube sizes and varied thermal conductivity with different grout materials are studied based on the benchmark residential building in Hot-humid Pensacola, Florida. In this study, the benchmark building is metered and the data is used to validate the simulation model. And a list of comparative simulation cases with varied parameter value are simulated to study the importance of pipe size and grout to the ground source heat pump energy consumption. The simulation software TRNSYS [1] is employed to fulfill this task. The results show the preliminary energy saving based on varied parameters. Future work needs to be conducted for the cost analysis, include the installation cost from contractor and materials cost.

Jiang Zhu; Yong X. Tao

2011-11-01T23:59:59.000Z

88

A Model for the Origin of High Density in Loop-top X-ray Sources  

E-Print Network (OSTI)

Super-hot looptop sources, detected in some large solar flares, are compact sources of HXR emission with spectra matching thermal electron populations exceeding 30 megakelvins. High observed emission measure, as well as inference of electron thermalization within the small source region, both provide evidence of high densities at the looptop; typically more than an order of magnitude above ambient. Where some investigators have suggested such density enhancement results from a rapid enhancement in the magnetic field strength, we propose an alternative model, based on Petschek reconnection, whereby looptop plasma is heated and compressed by slow magnetosonic shocks generated self-consistently through flux retraction following reconnection. Under steady conditions such shocks can enhance density by no more than a factor of four. These steady shock relations (Rankine-Hugoniot relations) turn out to be inapplicable to Petschek's model owing to transient effects of thermal conduction. The actual density enhancemen...

Longcope, D W

2011-01-01T23:59:59.000Z

89

Focus group discussions among owners and non-owners of ground source heat pumps  

SciTech Connect

This research was sponsored by the Office of Buildings and Community Systems and conducted by the Pacific Northwest Laboratory as part of an ongoing effort to enhance the commercial use of federally developed technology. Federal dollars have supported research on the development of ground source heat pumps (GSHP) for several years. Though several companies currently sell GSHP's for residential use, their share of the total heating and air conditioning business remains less than one percent. Large manufacturing companies with national distribution have not yet added GSHP equipment to their product line. GSHP's use only about one half (Braud 1987) to one third (Bose 1987) of the energy needed to operate conventional furnaces and air conditioners. Consequently, a high level of market penetration by the GSHP offers direct benefits to both utility companies and individual users of the systems. Widespread use of these highly efficient systems will reduce both total energy consupmtion, and problems associated with high levels of energy use during peak periods. This will allow utility companies to delay capital expenditures for new facilities to meet the growing energy demand during peak periods. The cost effective use of electricity also reduces the likelihood of homeowners switching to a different fuel source for heating. 5 refs.

Roberson, B.F.

1988-07-01T23:59:59.000Z

90

Ground-Source Integrated Heat Pump for Near-Zero Energy Houses: Technology Status Report  

DOE Green Energy (OSTI)

The energy service needs of a net-zero-energy house (ZEH) include space heating and cooling, water heating, ventilation, dehumidification, and humidification, depending on the requirements of the specific location. These requirements differ in significant ways from those of current housing. For instance, the most recent DOE buildings energy data (DOE/BED 2007) indicate that on average {approx}43% of residential buildings primary energy use is for space heating and cooling, vs. {approx}12% for water heating (about a 3.6:1 ratio). In contrast, for the particular prototype ZEH structures used in the analyses in this report, that ratio ranges from about 0.3:1 to 1.6:1 depending on location. The high-performance envelope of a ZEH results in much lower space heating and cooling loads relative to current housing and also makes the house sufficiently air-tight to require mechanical ventilation for indoor air quality. These envelope characteristics mean that the space conditioning load will be closer in size to the water heating load, which depends on occupant behavior and thus is not expected to drop by any significant amount because of an improved envelope. In some locations such as the Gulf Coast area, additional dehumidification will almost certainly be required during the shoulder and cooling seasons. In locales with heavy space heating needs, supplemental humidification may be needed because of health concerns or may be desired for improved occupant comfort. The U.S. Department of Energy (DOE) has determined that achieving their ZEH goal will require energy service equipment that can meet these needs while using 50% less energy than current equipment. One promising approach to meeting this requirement is through an integrated heat pump (IHP) - a single system based on heat pumping technology. The energy benefits of an IHP stem from the ability to utilize otherwise wasted energy; for example, heat rejected by the space cooling operation can be used for water heating. With the greater energy savings the cost of the more energy efficient components required for the IHP can be recovered more quickly than if they were applied to individual pieces of equipment to meet each individual energy service need. An IHP can be designed to use either outdoor air or geothermal resources (e.g., ground, ground water, surface water) as the environmental energy source/sink. Based on a scoping study of a wide variety of possible approaches to meeting the energy service needs for a ZEH, DOE selected the IHP concept as the most promising and has supported research directed toward the development of both air- and ground-source versions. This report describes the ground-source IHP (GS-IHP) design and includes the lessons learned and best practices revealed by the research and development (R&D) effort throughout. Salient features of the GS-IHP include a variable-speed rotary compressor incorporating a brushless direct current permanent magnet motor which provides all refrigerant compression, a variable-speed fan for the indoor section, a multiple-speed ground coil circuit pump, and a single-speed pump for water heating operation. Laboratory IHP testing has thus far used R-22 because of the availability of the needed components that use this refrigerant. It is expected that HFC R-410A will be used for any products arising from the IHP concept. Data for a variable-speed compressor that uses R-410A has been incorporated into the DOE/ORNL Mark VI Heat Pump Design Model (HPDM). HPDM was then linked to TRNSYS, a time-series-dependent simulation model capable of determining the energy use of building cooling and heating equipment as applied to a defined house on a sub-hourly basis. This provided a highly flexible design analysis capability for advanced heat pump equipment; however, the program also took a relatively long time to run. This approach was used with the initial prototype design reported in Murphy et al. (2007a) and in the business case analysis of Baxter (2007).

Murphy, Richard W [ORNL; Rice, C Keith [ORNL; Baxter, Van D [ORNL; Craddick, William G [ORNL

2007-09-01T23:59:59.000Z

91

Geothermal (Ground-Source) Heat Pumps: Market Status, Barriers to Adoption, and Actions to Overcome Barriers  

Science Conference Proceedings (OSTI)

More effective stewardship of our resources contributes to the security, environmental sustainability, and economic well-being of the nation. Buildings present one of the best opportunities to economically reduce energy consumption and limit greenhouse gas emissions. Geothermal heat pump systems (GHPs), sometimes called ground-source heat pump or Geo-Exchange systems, have been proven capable of producing large reductions in energy use and peak demand in buildings. However, GHPs have received little attention at the policy level as an important component of a national energy and climate strategy. Have policymakers mistakenly overlooked GHPs, or are GHPs simply unable to make a major contribution to the national goals for various reasons? This brief study was undertaken at DOE s request to address this conundrum. The scope of the study includes determining the status of global GHP markets and the status of the GHP industry and technology in the United States, assembling previous estimates of GHP energy savings potential and other benefits, identifying key barriers to application of GHPs, and identifying actions that could accelerate market adoption of GHPs. The findings are documented in a report along with conclusions and recommendations. This paper summarizes the key information from the report.

Hughes, Patrick [ORNL

2009-01-01T23:59:59.000Z

92

Geothermal(Ground-Source)Heat Pumps: Market Status, Barriers to Adoption, and Actions to Overcome Barriers  

Science Conference Proceedings (OSTI)

More effective stewardship of our resources contributes to the security, environmental sustainability, and economic well-being of the nation. Buildings present one of the best opportunities to economically reduce energy consumption and limit greenhouse gas emissions. Geothermal heat pumps (GHPs), sometimes called ground-source heat pumps, have been proven capable of producing large reductions in energy use and peak demand in buildings. However, GHPs have received little attention at the policy level as an important component of a national strategy. Have policymakers mistakenly overlooked GHPs, or are GHPs simply unable to make a major contribution to the national goals for various reasons? This brief study was undertaken at DOE's request to address this conundrum. The scope of the study includes determining the status of global GHP markets and the status of the GHP industry and technology in the United States, assembling previous estimates of GHP energy savings potential, identifying key barriers to application of GHPs, and identifying actions that could accelerate market adoption of GHPs. The findings are documented in this report along with conclusions and recommendations.

Hughes, Patrick [ORNL

2008-12-01T23:59:59.000Z

93

Hybrid Ground-Source Heat Pump Installations: Experiences, Improvements, and Tools  

SciTech Connect

One innovation to ground-source heat pump (GSHP, or GHP) systems is the hybrid GSHP (HyGSHP) system, which can dramatically decrease the first cost of GSHP systems by using conventional technology (such as a cooling tower or a boiler) to meet a portion of the peak heating or cooling load. This work uses three case studies (two cooling-dominated, one heating-dominated) to demonstrate the performance of the hybrid approach. Three buildings were studied for a year; the measured data was used to validate models of each system. The models were used to analyze further improvements to the hybrid approach, and establish that this approach has positive impacts, both economically and environmentally. Lessons learned by those who design and operate the systems are also documented, including discussions of equipment sizing, pump operation, and cooling tower control. Finally, the measured data sets and models that were created during this work are described; these materials have been made freely available for further study of hybrid systems.

Scott Hackel; Amanda Pertzborn

2011-06-30T23:59:59.000Z

94

Update on maintenance and service costs of commercial building ground-source heat pump systems  

Science Conference Proceedings (OSTI)

An earlier paper showed that commercial ground-source heat pump systems have significantly lower service and maintenance costs than alternative HVAC systems. This paper expands on those results by adding 13 more buildings to the original 25 sites and by comparing the results to the latest ASHRAE survey of HVAC maintenance costs. Data from the 38 sites are presented here including total (scheduled and unscheduled) maintenance costs in cents per square foot per year for base cost, in-house, and contractor-provided maintenance. Because some of the new sites had maintenance costs that were much higher than the industry norm, the resulting data are not normally distributed. Analysis (O'Hara Hines 1998) indicated that a log-normal distribution is a better fit; thus, the data are analyzed and presented here as log-normal. The log-mean annual total maintenance costs for the most recent year of the survey ranged from 6.07 cents per square foot to 8.37 cents per square foot for base cost and contractor-provided maintenance, respectively.

Cane, D.; Garnet, J.M.

2000-07-01T23:59:59.000Z

95

In-Depth Look at Ground Source Heat Pumps and Other Electric Loads in Two GreenMax Homes  

DOE Green Energy (OSTI)

CARB partnered with WPPI Energy to answer key research questions on in-field performance of ground-source heat pumps and LAMELs through extensive field monitoring at two WPPI GreenMax demonstration homes in Wisconsin. These two test home evaluations provided valuable data on the true in-field performance of various building mechanical systems and lighting, appliances, and miscellaneous loads (LAMELs).

Puttagunta, S.; Shapiro, C.

2012-04-01T23:59:59.000Z

96

Fermi acceleration at fast shock in a solar flare and impulsive loop-top hard X-ray source  

E-Print Network (OSTI)

We propose that non-thermal electrons are efficiently accelerated by first-order Fermi process at the fast shock, as a natural consequence of the new magnetohydrodynamic picture of the flaring region revealed with Yohkoh. An oblique fast shock is naturally formed below the reconnection site, and boosts the acceleration to significantly decrease the injection energy. The slow shocks attached to the reconnection X-point heat the plasma up to 10--20 MK, exceeding the injection energy. The combination of the oblique shock configuration and the pre-heating by the slow shock allows bulk electron acceleration from the thermal pool. The accelerated electrons are trapped between the two slow shocks due to the magnetic mirror downstream of the fast shock, thus explaining the impulsive loop-top hard X-ray source discovered with Yohkoh. Acceleration time scale is ~ 0.3--0.6 s, which is consistent with the time scale of impulsive bursts. When these electrons stream away from the region enclosed by the fast shock and the s...

Tsuneta, S; Tsuneta, Saku; Naito, Tsuguya

1998-01-01T23:59:59.000Z

97

Exergy Analysis and Operational Efficiency of a Horizontal Ground Source Heat Pump System Operated in a Low-Energy Test House under Simulated Occupancy Conditions  

SciTech Connect

This paper presents data, analyses, measures of performance, and conclusions for a ground-source heat pump (GSHP) providing space conditioning to a 345m2 house whose envelope is made of structural insulated panels (SIP). The entire thermal load of this SIP house with RSI-3.7 (RUS-21) walls, triple pane windows with a U-factor of 1.64 W/m2 K (0.29 Btu/h ft2 oF) and solar heat gain coefficient (SHGC) of 0.25, a roof assembly with overall thermal resistance of about RSI-8.8 (RUS-50) and low leakage rates of 0.74 ACH at 50Pa was satisfied with a 2.16-Ton (7.56 kW) GSHP unit consuming negligible (9.83kWh) auxiliary heat during peak winter season. The highest and lowest heating COP achieved was 4.90 (October) and 3.44 (February), respectively. The highest and lowest cooling COP achieved was 6.09 (April) and 3.88 (August). These COPs are calculated on the basis of the total power input (including duct, ground loop, and control power losses ). The second Law (Exergy) analysis provides deep insight into how systemic inefficiencies are distributed among the various GSHP components. Opportunities for design and further performance improvements are identified. Through Exergy analysis we provide a true measure of how closely actual performance approaches the ideal, and it unequivocally identifies, better than energy analysis does, the sources and causes of lost work, the root cause of system inefficiencies.

Ally, Moonis Raza [ORNL; Baxter, Van D [ORNL; Munk, Jeffrey D [ORNL; Gehl, Anthony C [ORNL

2012-01-01T23:59:59.000Z

98

Experimental Study on Operating Characteristic of the System of Ground Source Heat Pump Combined with Floor Radiant Heating of Capillary Tube  

Science Conference Proceedings (OSTI)

At first, the article presented particularly the working theory of the system of ground source heat pump combined with floor radiant heating of capillary tube, the characteristic of soil layers and the arrangement form of capillary tube mat and the floor ... Keywords: Ground source heat pump, Capillary tube, Radiant heating, Characteristic, Experiment

Yunzhun Fu; Cai Yingling; Jing Li; Yeyu Wang

2009-10-01T23:59:59.000Z

99

Foundation heat exchangers for residential ground source heat pump systems Numerical modeling and experimental validation  

Science Conference Proceedings (OSTI)

A new type of ground heat exchanger that utilizes the excavation often made for basements or foundations has been proposed as an alternative to conventional ground heat exchangers. This article describes a numerical model that can be used to size these foundation heat exchanger (FHX) systems. The numerical model is a two-dimensional finite-volume model that considers a wide variety of factors, such as soil freezing and evapotranspiration. The FHX numerical model is validated with one year of experimental data collected at an experimental house located near Oak Ridge, Tennessee. The model shows good agreement with the experimental data-heat pump entering fluid temperatures typically within 1 C (1.8 F) - with minor discrepancies due to approximations, such as constant moisture content throughout the year, uniform evapotranspiration over the seasons, and lack of ground shading in the model.

Xing, Lu [Oklahoma State University; Cullin, James [Oklahoma State University; Spitler, Jeffery [Oklahoma State University; Im, Piljae [ORNL; Fisher, Daniel [Oklahoma State University

2011-01-01T23:59:59.000Z

100

Simulation of Photovoltaic Panel Production as Complement to Ground Source Heat Pump System.  

E-Print Network (OSTI)

?? This master thesis presents a new technological combination of two environmentally friendly sources of energy in order to provide DHW, and space heating. Solar… (more)

Badri, Seyed Ali Mohammad

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Residential Ground Source Heat Pumps with Integrated Domestic Hot Water Generation: Performance Results from Long-Term Monitoring  

SciTech Connect

Ground source heat pumps (GSHPs) show promise for reducing house energy consumption, and a desuperheater can potentially further reduce energy consumption where the heat pump from the space conditioning system creates hot water. Two unoccupied houses were instrumented to document the installed operational space conditioning and water heating efficiency of their GSHP systems. This paper discusses instrumentation methods and field operation characteristics of the GSHPs, compares manufacturers' values of the coefficients of performance calculated from field measured data for the two GSHPs, and compares the measured efficiency of the desuperheater system to other domestic hot water systems.

Stecher, D.; Allison, K.

2012-11-01T23:59:59.000Z

102

Integrated Heat Pump (IHP) System Development - Air-Source IHP Control Strategy and Specifications and Ground-Source IHP Conceptual Design  

SciTech Connect

The integrated heat pump (IHP), as one appliance, can provide space cooling, heating, ventilation, and dehumidification while maintaining comfort and meeting domestic water heating needs in near-zero-energy home (NZEH) applications. In FY 2006 Oak Ridge National Laboratory (ORNL) completed development of a control strategy and system specification for an air-source IHP. The conceptual design of a ground-source IHP was also completed. Testing and analysis confirm the potential of both IHP concepts to meet NZEH energy services needs while consuming 50% less energy than a suite of equipment that meets current minimum efficiency requirements. This report is in fulfillment of an FY06 DOE Building Technologies (BT) Joule Milestone.

Murphy, Richard W [ORNL; Rice, C Keith [ORNL; Baxter, Van D [ORNL

2007-05-01T23:59:59.000Z

103

CNCC Craig Campus Geothermal Program: 82-well closed loop GHP well field to  

Open Energy Info (EERE)

CNCC Craig Campus Geothermal Program: 82-well closed loop GHP well field to CNCC Craig Campus Geothermal Program: 82-well closed loop GHP well field to provide geothermal energy as a common utility for a new community college campus. Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title CNCC Craig Campus Geothermal Program: 82-well closed loop GHP well field to provide geothermal energy as a common utility for a new community college campus. Project Type / Topic 1 Recovery Act - Geothermal Technologies Program: Ground Source Heat Pumps Project Type / Topic 2 Topic Area 1: Technology Demonstration Projects Project Description This "geothermal central plant" concept will provide ground source loop energy as a utility to be shared by the academic and residential buildings on the soon-to-be-constructed campus.

104

Comparison of Aermod and ISCST3 Models for Particulate Emissions from Ground Level Sources  

E-Print Network (OSTI)

Emission factors (EFs) and results from dispersion models are key components in the air pollution regulatory process. The EPA preferred regulatory model changed from ISCST3 to AERMOD in November, 2007. Emission factors are used in conjunction with dispersion models to predict 24-hour concentrations that are compared to National Ambient Air Quality Standards (NAAQS) for determining the required control systems in permitting sources. This change in regulatory models has had an impact on the regulatory process and the industries regulated. In this study, EFs were developed for regulated particulate matter PM10 and PM2.5 from cotton harvesting. Measured concentrations of TSP and PM10 along with meteorological data were used in conjunction with the dispersion models ISCST3 and AERMOD, to determine the emission fluxes from cotton harvesting. The goal of this research was to document differences in emission factors as a consequence of the models used. The PM10 EFs developed for two-row and six-row pickers were 154 + 43 kg/km2 and 425 + 178 kg/km2, respectively. From the comparison between AERMOD and ISCST3, it was observed that AERMOD EFs were 1.8 times higher than ISCST3 EFs for Emission factors (EFs) and results from dispersion models are key components in the air pollution regulatory process. The EPA preferred regulatory model changed from ISCST3 to AERMOD in November, 2007. Emission factors are used in conjunction with dispersion models to predict 24-hour concentrations that are compared to National Ambient Air Quality Standards (NAAQS) for determining the required control systems in permitting sources. This change in regulatory models has had an impact on the regulatory process and the industries regulated. In this study, EFs were developed for regulated particulate matter PM10 and PM2.5 from cotton harvesting. Measured concentrations of TSP and PM10 along with meteorological data were used in conjunction with the dispersion models ISCST3 and AERMOD, to determine the emission fluxes from cotton harvesting. The goal of this research was to document differences in emission factors as a consequence of the models used. The PM10 EFs developed for two-row and six-row pickers were 154 + 43 kg/km2 and 425 + 178 kg/km2, respectively. From the comparison between AERMOD and ISCST3, it was observed that AERMOD EFs were 1.8 times higher than ISCST3 EFs for absence of solar radiation. Using AERMOD predictions of pollutant concentrations off property for regulatory purposes will likely affect a source?s ability to comply with limits set forth by State Air Pollution Regulatory Agencies (SAPRAs) and could lead to inappropriate regulation of the source.

Botlaguduru, Venkata Sai V.

2009-12-01T23:59:59.000Z

105

Impacts of Soil and Pipe Thermal Conductivity on Performance of Horizontal Pipe in a Ground-source Heat Pump  

E-Print Network (OSTI)

In this paper the composition and thermal property of soil are discussed. The main factors that impact the soil thermal conductivity and several commonly-used pipe materials are studied. A model of heat exchanger with horizontal pipes of ground-source heat pump is developed. The impact of soil thermal conductivity and pipe thermal conductivity on the soil temperature field around the buried pipe, and the thermal performance of the heat exchanger are simulated. The simulation results show that with the increase of soil thermal conductivity, heat transfer quantity obviously increases, and the temperature of soil around pipe decrease under winter conditions. The temperature field varies relatively faster with thermal conductivity in the site nearer to the buried pipe. With the increase of pipe thermal conductivity, heat transfer quantity and the mean temperature of the buried pipe's outside surface all increase.

Song, Y.; Yao, Y.; Na, W.

2006-01-01T23:59:59.000Z

106

Numerical Simulation of a Latent Heat Storage System of a Solar-Aided Ground Source Heat Pump  

E-Print Network (OSTI)

In this study, the rectangular phase change storage tank (PCST) linked to a solar-aided ground source heat pump (SAGSHP) system is investigated experimentally and theoretically. The container of the phase change material (PCM) is the controlling unit of the phase change heat transfer model. It was solved numerically by an enthalpy-based finite difference method and was validated by experimental data. CaCl2•6H2O was used as the PCM in the latent heat storage system of SAGSHP system. In the tank, the PCMs are encapsulated in plastic kegs that are setting on the serpentine coil. The experiments were performed from March 12 to April 10, 2004 in the heating season of the transition period. In order to reflect the effects of the system, two days were chosen to compare the numerical results with experimental data. The inlet and outlet temperature of the water in the PCST, temperature of PCM and storage and emission heat of PCST were measured. The trends of the variation of numerical results and experimental data were in close agreement. Numerical results can reflect the operation mode of the system very well.

Wang, F.; Zheng, M.; Li, Z.; Lei, B.

2006-01-01T23:59:59.000Z

107

Analysis of Selection of Single or Double U-bend Pipes in a Ground Source Heat Pump System  

E-Print Network (OSTI)

The ground source heat pump (GSHP) system is widely used because of its energy-saving and environmental-friendly characteristics. The buried pipes heat exchangers play an important role in the whole GSHP system design. However, in most cases, single U-bend pipes are adopted only for their simplicity in design and construction instead of high efficiency and less operation cost of the whole system. In this paper, we make a comparison between single and double U-bend pipe heat exchangers in their heat exchange rate per depth, the number of boreholes needed for the same amount of cooling load, total lengths of pipes for the two different types of heat exchangers, and seasonal overall energy efficiency of the two GSHP systems. An economic analysis method is also presented. Finally, conclusions are made for the selection of single or double U-bend pipe heat exchangers in a GSHP system after a case study using TRNSYS simulation software is carried out.

Shu, H.; Duanmu, L.; Hua, R.

2006-01-01T23:59:59.000Z

108

Chemical Looping | Open Energy Information  

Open Energy Info (EERE)

Looping Looping Jump to: navigation, search Contents 1 Introduction 2 Process Description 3 Benefits 4 Oxygen Carriers 5 Multimedia 6 Patents 7 References 8 External Links Introduction Chemical looping or chemical looping combustion (CLC) is a novel technology that could provide the means to convert fossil fuels to electricity and provide carbon capture without significant efficiency or cost penalties. Chemical looping combustion is very similar to oxy-fuel combustion where there is no direct contact between air and fuel.[1] Oxygen is extracted from air, then the oxygen is reacted with the hydrocarbon fuel producing an exhaust gas composed of carbon dioxide and water vapor.[2] The water vapor is condensed out of the gas resulting in near 100% carbon dioxide stream that could be sequestered in the ground.

109

The End-Use Technology Assessment Project: A Load-Shape Analysis of Ground Source Heat Pumps and Good Cents Homes  

Science Conference Proceedings (OSTI)

Interest is growing in end-use technology applications that promote overall energy efficiency through increased electricity use. This study will help utilities understand the impacts of such applications by providing load-shape information on ground source heat pumps as well as energy-efficient appliances promoted through Good Cents Homes programs. This report is available only to funders of Program 101A or 101.001. Funders may download this report at http://my.primen.com/Applications/DE/Community/index...

1995-05-27T23:59:59.000Z

110

Loop-to-loop coupling.  

Science Conference Proceedings (OSTI)

This report estimates inductively-coupled energy to a low-impedance load in a loop-to-loop arrangement. Both analytical models and full-wave numerical simulations are used and the resulting fields, coupled powers and energies are compared. The energies are simply estimated from the coupled powers through approximations to the energy theorem. The transmitter loop is taken to be either a circular geometry or a rectangular-loop (stripline-type) geometry that was used in an experimental setup. Simple magnetic field models are constructed and used to estimate the mutual inductance to the receiving loop, which is taken to be circular with one or several turns. Circuit elements are estimated and used to determine the coupled current and power (an equivalent antenna picture is also given). These results are compared to an electromagnetic simulation of the transmitter geometry. Simple approximate relations are also given to estimate coupled energy from the power. The effect of additional loads in the form of attached leads, forming transmission lines, are considered. The results are summarized in a set of susceptibility-type curves. Finally, we also consider drives to the cables themselves and the resulting common-to-differential mode currents in the load.

Warne, Larry Kevin; Lucero, Larry Martin; Langston, William L.; Salazar, Robert Austin; Coleman, Phillip Dale; Basilio, Lorena I.; Bacon, Larry Donald

2012-05-01T23:59:59.000Z

111

Field and Laboratory Study of a Ground-Coupled Water Source Heat Pump with an Integral Enthalpy Exchange System for Classrooms  

E-Print Network (OSTI)

School classroom space-conditioning equipment in hot and humid climates is often excessively burdened by the requirement to dehumidify incoming air to maintain proper thermal comfort and air quality. To that end, application of new or modified technologies is needed to increase the dehumidification abilities of equipment without compromising energy efficiency or the need for fresh ventilation air. To study the effectiveness of integrated heat pump and enthalpy exchange equipment, a nominal 4-ton water-source heat pump, coupled with a geothermal water loop and incorporating a forced fresh-air enthalpy exchange system was installed in a typical middle school classroom in Oak Ridge, Tennessee. This project is a joint effort among Oak Ridge School District, Tennessee Valley Authority, Energy Office of the State of Tennessee, and Oak Ridge National Laboratory. The retrofit classroom, along with a similar baseline classroom (employing a water source heat pump supplied by a boiler/cooling tower loop), were instrumented with an Internet-based system to control and monitor performance, efficiency, and a variety of air states. Those include classroom air, outdoor air, semi-conditioned fresh air, and supply air. Particular attention was dedicated to the humidity content and the carbon dioxide content of conditioned space (classroom) air and to the intake rate of forced fresh air. This field study builds on a previous laboratory study of a water-source heat pump coupled to an enthalpy recovery system. The laboratory work showed good potential for reducing the moisture load from forced ventilation air. At simulated outdoor conditions of 90°F (32.2°C) and 90% RH, the enthalpy recovery wheel in the nominal 2-ton system was able to capture and exhaust 9.9 lb of moisture that would otherwise have to be handled solely by the cooling coil.

Domitrovic, R.; Hayzen, G. J.; Johnson, W. S.; Chen, F. C.

2002-01-01T23:59:59.000Z

112

LOOP CALCULUS AND BELIEF PROPAGATION FOR Q-ARY ALPHABET: LOOP TOWER  

Science Conference Proceedings (OSTI)

Loop calculus introduced in [1], [2] constitutes a new theoretical tool that explicitly expresses symbol Maximum-A-Posteriori (MAP) solution of a general statistical inference problem via a solution of the Belief Propagation (BP) equations. This finding brought a new significance to the BP concept, which in the past was thought of as just a loop-free approximation. In this paper they continue a discussion of the Loop Calculus, partitioning the results into three Sections. In Section 1 they introduce a new formulation of the Loop Calculus in terms of a set of transformations (gauges) that keeping the partition function of the problem invariant. The full expression contains two terms referred to as the 'ground state' and 'excited states' contributions. The BP equations are interpreted as a special (BP) gauge fixing condition that emerges as a special orthogonality constraint between the ground state and excited states, which also selects loop contributions as the only surviving ones among the excited states. In Section 2 they demonstrate how the invariant interpretation of the Loop Calculus, introduced in Section 1, allows a natural extension to the case of a general q-ary alphabet, this is achieved via a loop tower sequential construction. The ground level in the tower is exactly equivalent to assigning one color (out of q available) to the 'ground state' and considering all 'excited' states colored in the remaining (q-1) colors, according to the loop calculus rule. Sequentially, the second level in the tower corresponds to selecting a loop from the previous step, colored in (q-1) colors, and repeating the same ground vs excited states splitting procedure into one and (q-2) colors respectively. The construction proceeds till the full (q-1)-levels deep loop tower (and the corresponding contributions to the partition function) are established. In Section 3 they discuss an ultimate relation between the loop calculus and the Bethe-Free energy variational approach of [3].

CHERTKOV, MICHAEL [Los Alamos National Laboratory; CHERNYAK, VLADIMIR [Los Alamos National Laboratory

2007-01-10T23:59:59.000Z

113

Sources  

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

SOURCES Microsoft Corporation. "Gasohol," Microsoft Encarta Online Encyclopedia 2001, http:encarta.msn.com. U.S. Department of Transportation, Federal Highway Administration, A...

114

Pre-Shot Simulations of Far-Field Ground Motions for the Source Physics Experiment (SPE) Explosions at the Climax Stock, Nevada National Security Site  

SciTech Connect

The Source Physics Experiment (SPE) will involve a series of explosions in various geologic and emplacement conditions to validate numerical simulation methods to predict behavior of seismic wave excitation and propagation for nuclear test monitoring. The first SPE's currently underway involve explosions in the Climax Stock (granitic geology) at the Nevada National Security Site (NNSS). Detailed geologic data and published material properties for the major lithologic units of the NNSS and surrounding region were used to build three-dimensional models for seismic wave propagation simulations. The geologic structure near the SPE shot point is quite varied including granitic, carbonate, tuff and alluvium lithologies. We performed preliminary ground motion simulations for a near-source domain covering 8 km x 8 km at the surface centered on the shot point to investigate various source and propagation effects using WPP, LLNL's anelastic seismic wave finite difference code. Simulations indicate that variations in wave propagation properties of the sub-surface will generate strongly path-dependent response once the energy has left the relatively small granitic geology of the near-surface Climax Stock near the SPE shot point. Rough topography to the north and west of SPE shot point causes additional complexity in the signals including energy on the transverse components. Waves propagate much faster through the granitic and carbonate formations and slower through the tuff and alluvium. Synthetic seismograms for a pure explosion source in a 3D geologic structure show large amplitudes on transverse component. For paths to the south sampling the granite, tuff and alluvium lithologies transverse component amplitudes are as high as 50% of that on the vertical and radial components.

Rodgers, A J; Wagoner, J; Petersson, N A; Sjogreen, B

2010-11-07T23:59:59.000Z

115

Pre-shot simulations of far-field ground motion for the Source Physics Experiment (SPE) Explosions at the Climax Stock, Nevada National Security Site: SPE2  

SciTech Connect

The Source Physics Experiment (SPE) is planning a 1000 kg (TNT equivalent) shot (SPE2) at the Nevada National Security Site (NNSS) in a granite borehole at a depth (canister centroid) of 45 meters. This shot follows an earlier shot of 100 kg in the same borehole at a depth 60 m. Surrounding the shotpoint is an extensive array of seismic sensors arrayed in 5 radial lines extending out 2 km to the north and east and approximately 10-15 to the south and west. Prior to SPE1, simulations using a finite difference code and a 3D numerical model based on the geologic setting were conducted, which predicted higher amplitudes to the south and east in the alluvium of Yucca Flat along with significant energy on the transverse components caused by scattering within the 3D volume along with some contribution by topographic scattering. Observations from the SPE1 shot largely confirmed these predictions although the ratio of transverse energy relative to the vertical and radial components was in general larger than predicted. A new set of simulations has been conducted for the upcoming SPE2 shot. These include improvements to the velocity model based on SPE1 observations as well as new capabilities added to the simulation code. The most significant is the addition of a new source model within the finite difference code by using the predicted ground velocities from a hydrodynamic code (GEODYN) as driving condition on the boundaries of a cube embedded within WPP which provides a more sophisticated source modeling capability linked directly to source site materials (e.g. granite) and type and size of source. Two sets of SPE2 simulations are conducted, one with a GEODYN source and 3D complex media (no topography node spacing of 5 m) and one with a standard isotropic pre-defined time function (3D complex media with topography, node spacing of 5 m). Results were provided as time series at specific points corresponding to sensor locations for both translational (x,y,z) and rotational components. Estimates of spectral scaling for SPE2 are provided using a modified version of the Mueller-Murphy model. An estimate of expected aftershock probabilities were also provided, based on the methodology of Ford and Walter, [2010].

Mellors, R J; Rodgers, A; Walter, W; Ford, S; Xu, H; Matzel, E; Myers, S; Petersson, N A; Sjogreen, B; Hauk, T; Wagoner, J

2011-10-18T23:59:59.000Z

116

Fast flux locked loop  

DOE Patents (OSTI)

A flux locked loop for providing an electrical feedback signal, the flux locked loop employing radio-frequency components and technology to extend the flux modulation frequency and tracking loop bandwidth. The flux locked loop of the present invention has particularly useful application in read-out electronics for DC SQUID magnetic measurement systems, in which case the electrical signal output by the flux locked loop represents an unknown magnetic flux applied to the DC SQUID.

Ganther, Jr., Kenneth R. (Olathe, KS); Snapp, Lowell D. (Independence, MO)

2002-09-10T23:59:59.000Z

117

Measurements of volatile organic compounds at a suburban ground site (T1) in Mexico City during the MILAGRO 2006 campaign: Measurement comparison, emission ratios, and source attribution  

Science Conference Proceedings (OSTI)

Volatile organic compound (VOC) mixing ratios were measured with two different instruments at the T1 ground site in Mexico City during the Megacity Initiative: Local and Global Research Observations (MILAGRO) campaign in March of 2006. A gas chromatograph with flame ionization detector (GC-FID) quantified 18 light alkanes, alkenes and acetylene while a proton-transfer-reaction ion-trap mass spectrometer (PIT-MS) quantified 12 VOC species including oxygenated VOCs (OVOCs) and aromatics. A GC separation system was used in conjunction with the PIT-MS (GC-PIT-MS) to evaluate PIT-MS measurements and to aid in the identification of unknown VOCs. The VOC measurements are also compared to simultaneous canister samples and to two independent proton-transfer-reaction mass spectrometers (PTR-MS) deployed on a mobile and an airborne platform during MILAGRO. VOC diurnal cycles demonstrate the large influence of vehicle traffic and liquid propane gas (LPG) emissions during the night and photochemical processing during the afternoon. Emission ratios for VOCs and OVOCs relative to CO are derived from early-morning measurements. Average emission ratios for non-oxygenated species relative to CO are on average a factor of {approx}2 higher than measured for US cities. Emission ratios for OVOCs are estimated and compared to literature values the northeastern US and to tunnel studies in California. Positive matrix factorization analysis (PMF) is used to provide insight into VOC sources and processing. Three PMF factors were distinguished by the analysis including the emissions from vehicles, the use of liquid propane gas and the production of secondary VOCs + long-lived species. Emission ratios to CO calculated from the results of PMF analysis are compared to emission ratios calculated directly from measurements. The total PIT-MS signal is summed to estimate the fraction of identified versus unidentified VOC species.

Bon, D.M.; Springston, S.; M.Ulbrich, I.; de Gouw, J. A.; Warneke, C.; Kuster, W. C.; Alexander, M. L.; Baker, A.; Beyersdorf, A. J.; Blake, D.; Fall, R.; Jimenez, J. L., Herndon, S. C.; Huey, L. G.; Knighton, W. B.; Ortega, J.; Vargas, O.

2011-03-16T23:59:59.000Z

118

A Review of Ground Coupled Heat Pump Models Used in Whole-Building Computer Simulation Programs  

E-Print Network (OSTI)

Increasingly, building owners are turning to ground source heat pump (GSHP) systems to improve energy efficiency. Ground-coupled heat pump (GCHP) systems with a vertical closed ground loop heat exchanger are one of the more widely used systems. Over the last thirty years, a number of simulation models have been developed to calculate the performance of the ground heat exchanger (GHX). The several computer programs can evaluate the GCHP systems as a part of the whole-building energy simulation. This paper briefly presents a general introduction to GSHP systems and the GCHP system, and reviews the currently developed GCHP models and compares computer programs for a GCHP design. In addition, GHX models which play an important role on the GCHP performance are reviewed. Finally, several widely recognized computer simulation programs for building energy analysis are compared regarding their GCHP simulation capability.

Do, S. L.; Haberl, J. S.

2010-08-01T23:59:59.000Z

119

Ground Motion Workshop  

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

2nd Advanced ICFA Beam Dynamics Workshop 2nd Advanced ICFA Beam Dynamics Workshop on Ground Motion in Future Accelerators November 6 - 9, 2000 SLAC Coordinators: Andrei Seryi & Tor Raubenheimer Proceedings Updated June 26, 2001 Agenda and Presentations Workshop photos Summaries Useful links Poster Goals Introduction to the problems Structure Registration Registered participants Committees Location, Accommodations and Travel Workshop on Ground Motion in Future Accelerators A workshop was held at SLAC that was devoted to ground motion and its effects on future accelerators. Ground motion and vibration can be a limiting effect in synchrotron light sources, hadron circular colliders, and electron/positron linear colliders. Over the last several years, there has been significant progress in the understanding of the ground motion and its effects, however, there are

120

Grounding intentionality  

E-Print Network (OSTI)

In this thesis, I argue that current attempts to ground intentionality face one of two challenges. Either the grounding feature of intentionality will be itself intentional or the grounding feature is disparate in nature from the representational capacity of an intentional mental state and therefore no connection between the two can be taken to exist. I examine two current accounts of intentionality and the features they utilize to ground it. I maintain that both views fall prey to one or both of the objections I raise. I conclude that any account of intentionality will need to meet both of these challenges in order to be counted successful.

Huizenga Steven R

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Software: LoopDA  

Science Conference Proceedings (OSTI)

... The method employed is based largely upon the Loop Equation Design Method that provides for sizing of openings to utilize driving wind and stack ...

2013-03-18T23:59:59.000Z

122

Loop Equation in Turbulence  

E-Print Network (OSTI)

The incompressible fluid dynamics is reformulated as dynamics of closed loops $C$ in coordinate space. This formulation allows to derive explicit functional equation for the generating functional $\\Psi[C]$ in inertial range of spatial scales, which allows the scaling solutions. The requirement of finite energy dissipation rate leads then to the Kolmogorov index. We find an exact steady solution of the loop equation in inertial range of the loop sizes. The generating functional decreases as $\\EXP{-A^{\\tt}}$ where $A=\\oint_C r \\wedge dr$ is the area inside the loop. The pdf for the velocity circulation $\\Gamma$ is Lorentzian, with the width $\\bar{\\Gamma} \\propto A^{\\tt} $.

Alexander A. Migdal

1993-03-23T23:59:59.000Z

123

METHOD OF LOCATING GROUNDS  

DOE Patents (OSTI)

ABS>This patent presents a method for locating a ground in a d-c circult having a number of parallel branches connected across a d-c source or generator. The complete method comprises the steps of locating the ground with reference to the mildpoint of the parallel branches by connecting a potentiometer across the terminals of the circuit and connecting the slider of the potentiometer to ground through a current indicating instrument, adjusting the slider to right or left of the mildpoint so as to cause the instrument to indicate zero, connecting the terminal of the network which is farthest from the ground as thus indicated by the potentiometer to ground through a condenser, impressing a ripple voltage on the circuit, and then measuring the ripple voltage at the midpoint of each parallel branch to find the branch in which is the lowest value of ripple voltage, and then measuring the distribution of the ripple voltage along this branch to determine the point at which the ripple voltage drops off to zero or substantially zero due to the existence of a ground. The invention has particular application where a circuit ground is present which will disappear if the normal circuit voltage is removed.

Macleish, K.G.

1958-02-11T23:59:59.000Z

124

flow_loop.indd  

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

FLOW ASSURANCE TEST LOOP FLOW ASSURANCE TEST LOOP Objective O ver a decade ago, RMOTC began cooperatively building a full-scale facility to test new fl ow assurance technology, mainly in the areas of hydrates and paraffi ns. Today, RMOTC's test facility consists of fi ve individual loop sections, including chilling and heated pipe-in-pipe water sections, bare lines, and a mixing section. The facility was designed to represent typical deepwater production systems in order to simulate full-scale tests and apply the results to fl ow assurance fi eld applications and technology. The current facility design consists of a 6" x 3,600 maximum allowable operating pressure test pipeline in fi ve separate loops. The test loops begin and ter- minate at a central location just north

125

Loose Loops Sink Chips  

E-Print Network (OSTI)

This paper explores the concept of micro-architectural loops and discusses their impact on processor pipelines. In particular, we establish the relationship between loose loops and pipeline length and configuration, and show their impact on performance. We then evaluate the load resolution loop in detail and propose the distributed register algorithm (DRA) as a way of reducing this loop. It decreases the performance loss due to load mis-speculations by reducing the issue-to-execute latency in the pipeline. A new loose loop is introduced into the pipeline by the DRA, but the frequency of mis-speculations is very low. The reduction in latency from issue to execute, along with a low mis-speculation rate in the DRA result in up to a 4% to 15% improvement in performance using a detailed architectural simulator.

Eric Borch Intel; Eric Borch; Eric Tune; Srilatha Manne; Joel Emer

2002-01-01T23:59:59.000Z

126

Loose loops sink chips  

E-Print Network (OSTI)

This paper explores the concept of micro-architectural loops and discusses their impact on processor pipelines. In particular, we establish the relationship between loose loops and pipeline length and configuration, and show their impact on performance. We then evaluate the load resolution loop in detail and propose the distributed register algorithm (DRA) as a way of reducing this loop. It decreases the performance loss due to load mis-speculations by reducing the issue-to-execute latency in the pipeline. A new loose loop is introduced into the pipeline by the DRA, but the frequency of mis-speculations is very low. The reduction in latency from issue to execute, along with a low mis-speculation rate in the DRA result in up to a 4 % to 15% improvement in performance using a detailed architectural simulator. 1

Eric Borch; Eric Tune; Srilatha Manne; Joel Emer; Stage N

2002-01-01T23:59:59.000Z

127

Ground Water  

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

Water Nature Bulletin No. 408-A February 27, 1971 Forest Preserve District of Cook County George W. Dunne, President Roland F. Eisenbeis, Supt. of Conservation GROUND WATER We take...

128

Ground-coupled heat pump systems: a pumping analysis.  

E-Print Network (OSTI)

??Ground-coupled heat pump (GCHP) systems use the ground as a heat source or sink that absorbs heat from or rejects heat to the soil, respectively;… (more)

Mays, Cristin Jean

2012-01-01T23:59:59.000Z

129

Wireless Local Loop  

Science Conference Proceedings (OSTI)

Wireless local loop systems are available to provide both broadband and narrowband services to customers. Narrowband systems are generally either based on cordless or mobile standards, or a manufacturer‘s proprietary technology. They are generally ...

R. P. Merrett; P. V. E. Beastall; S. J. Buttery

1998-10-01T23:59:59.000Z

130

Klystron "efficiency loop" for the ALS storage ring RF system  

E-Print Network (OSTI)

EFFICIENCY LOOP” FOR THE ALS STORAGE RING RF SYSTEM* S.at the Advanced Light Source (ALS) in order to decrease thethe cavities. 1 INTRODUCTION ALS Storage Ring RF system is

Kwiatkowski, Slawomir; Julian, Jim; Baptiste, Kenneth

2002-01-01T23:59:59.000Z

131

COLD TEST LOOP INTEGRATED TEST LOOP RESULTS  

Science Conference Proceedings (OSTI)

A testing facility (Cold Test Loop) was constructed and operated to demonstrate the efficacy of the Accelerated Waste Retrieval (AWR) Project's planned sluicing approach to the remediation of Silos 1 and 2 at the Fernald Environmental Management Project near Cincinnati, Ohio. The two silos contain almost 10,000 tons of radium-bearing low-level waste, which consists primarily of solids of raffinates from processing performed on ores from the Democratic Republic of Congo (commonly referred to as ''Belgium Congo ores'') for the recovery of uranium. These silos are 80 ft in diameter, 36 ft high to the center of the dome, and 26.75 ft to the top of the vertical side walls. The test facility contained two test systems, each designed for a specific purpose. The first system, the Integrated Test Loop (ITL), a near-full-scale plant including the actual equipment to be installed at the Fernald Site, was designed to demonstrate the sluicing operation and confirm the selection of a slurry pump, the optimal sluicing nozzle operation, and the preliminary design material balance. The second system, the Component Test Loop (CTL), was designed to evaluate many of the key individual components of the waste retrieval system over an extended run. The major results of the initial testing performed during July and August 2002 confirmed that the AWR approach to sluicing was feasible. The ITL testing confirmed the following: (1) The selected slurry pump (Hazleton 3-20 type SHW) performed well and is suitable for AWR application. However, the pump's motor should be upgraded to a 200-hp model and be driven by a 150-hp variable-frequency drive (VFD). A 200-hp VFD is not much more expensive and would allow the pump to operate at full speed. (2) The best nozzle performance was achieved by using 15/16-in. nozzles operated alternately. This configuration appeared to most effectively mine the surrogate. (3) The Solartron densitometer, which was tested as an alternative mass flow measurement device, did not operate effectively. Consequently, it is not suitable for application to the AWR process. (4) Initially, the spray ring (operated at approximately 2300 psi) and the nozzles provided by the pump vendor did not perform acceptably. The nozzles were replaced with a more robust model, and the performance was then acceptable. (5) The average solids concentration achieved in the slurry before Bentogrout addition was approximately 16% by weight. The solids concentration of the slurry after Bentogrout addition ranged from 26% to approximately 40%. The slurry pump and ITL system performed well at every concentration. No line plugging or other problems were noted. The results of the CTL runs and later ITL testing are summarized in an appendix to this report.

Abraham, TJ

2003-10-22T23:59:59.000Z

132

EPA Final Ground Water Rule  

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

Office of Nuclear Safety and Environment Office of Nuclear Safety and Environment Nuclear Safety and Environment Information Brief HS-20-IB-2007-02 (March 2007) EPA Final Ground Water Rule Safe Drinking Water Act: National Primary Drinking Water Regulations Ground Water Rule - 40 CFR Parts 9, 141 and 142 Final Rule: 71 FR 65574 Effective Date: January 8, 2007 1 RULE SYNOPSIS On November 8, 2006, the U.S. Environmental Protection Agency (EPA) published a final Ground Water Rule (GWR) to promote increased protection against microbial pathogens that may be present in public water systems (PWSs) that use ground water sources for their supply (these systems are known as ground water systems). This Rule establishes a risk-targeted approach

133

Time-Constrained Loop Pipelining  

Science Conference Proceedings (OSTI)

This paper addresses the problem of Time-Constrained Loop Pipelining, i.e. given a fixed throughput, finding a schedule of a loop which minimizes resource requirements. This paper proposes a methodology, called TCLP, based on dividing the problem into ... Keywords: loop pipelining, scheduling, timing and resource contraints, register optimization

Fermin Sanchez

1995-12-01T23:59:59.000Z

134

Lectures on loop gravity  

E-Print Network (OSTI)

This is the first version of the introductory lectures on loop quantum gravity that I will give at the quantum gravity school in Zakopane. The theory is presented in self-contained form, without emphasis on its derivation from classical general relativity. Dynamics is given in the covariant form. The approximations needed to compute physical quantities are discussed. Some applications are described, including the recent derivation of de Sitter cosmology from full quantum gravity.

Rovelli, Carlo

2011-01-01T23:59:59.000Z

135

Molten salt test loop  

DOE Green Energy (OSTI)

The objective of the Molten Salt Test Loop Project was to design, construct, and demonstrate operation of an outdoor high temperature molten salt test facility. This facility is operational, and can now be used to evaluate materials and components, and the design features and operating procedures required for molten salt heat transport systems. The initial application of the loop was to demonstrate the feasibility of using molten salt as the heat transport medium for a high temperature distributed collector system. A commercially available eutectic salt blend is used as the heat transfer fluid. This salt has a composition of 40% NaNO/sub 2/, 7% NaNO/sub 3/, and 53% KNO/sub 3/ and is marketed under the trade name Hitec. It has a freezing (solidifying) point of 142/sup 0/C (288/sup 0/F) and has been satisfactorily used at temperatures as high as 594/sup 0/C (1100/sup 0/F). General Atomic (GA) installed a row of Fixed Mirror Solar Concentrators (FMSC's) in the loop. The system was started up and a test program conducted. Startup went smoothly, with the exception of some burned-out trace heaters. Salt temperatures as high as 571/sup 0/C (1060/sup 0/F) were achieved.

Schuster, J.R.; Eggers, G.H.

1980-01-01T23:59:59.000Z

136

Powers of Elements in Jordan Loops  

E-Print Network (OSTI)

A Jordan loop is a commutative loop satisfying the Jordan identity $(x^2 y) x = x^2 (y x)$. We establish several identities involving powers in Jordan loops and show that there is no nonassociative Jordan loop of order $9$.

Pula, Kyle

2010-01-01T23:59:59.000Z

137

Coupled dual loop absorption heat pump  

DOE Patents (OSTI)

A coupled dual loop absorption system which utilizes two separate complete loops. Each individual loop operates at three temperatures and two pressures. This low temperature loop absorber and condenser are thermally coupled to the high temperature loop evaporator, and the high temperature loop condenser and absorber are thermally coupled to the low temperature generator.

Sarkisian, Paul H. (Watertown, MA); Reimann, Robert C. (Lafayette, NY); Biermann, Wendell J. (Fayetteville, NY)

1985-01-01T23:59:59.000Z

138

Water-Loop Heat Pump Systems: Assessment Study Update  

Science Conference Proceedings (OSTI)

Water-loop heat pump systems, composed of multiple water-source heat pumps, a boiler, and a cooling tower operating in a closed water loop are a key segment of the commercial building heat pump market. This type of system provides a low-first-cost, versatile, and energy-efficient approach to space conditioning commercial buildings that have simultaneous heating and cooling loads.

1991-10-25T23:59:59.000Z

139

On the Rational Terms of the one-loop amplitudes  

E-Print Network (OSTI)

The various sources of Rational Terms contributing to the one-loop amplitudes are critically discussed. We show that the terms originating from the generic (n-4)-dimensional structure of the numerator of the one-loop amplitude can be derived by using appropriate Feynman rules within a tree-like computation. For the terms that originate from the reduction of the 4-dimensional part of the numerator, we present two different strategies and explicit algorithms to compute them.

Giovanni Ossola; Costas G. Papadopoulos; Roberto Pittau

2008-02-13T23:59:59.000Z

140

REACTOR MAIN COOLANT LOOP  

SciTech Connect

A parametric study was made for the POPR with temperature gradients of 610 to 670 deg F and 6l0 to 684.5 deg F at organic flow rates of 17.8 x l0/sup 6/ and l4.4 x l0/sup 6/ lbs/hr, respectively; and steam turbine conditions at the throttle of 600 and 650 deg F at 800 to l200 psig. The study was made to obtain the most economical layout of the main heat transfer loop system. (B.O.G.)

Terpe, G.R.; Katz, B.

1961-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Cascading Closed Loop Cycle Power Generation  

E-Print Network (OSTI)

WOW Energies was issued Patent 6,857,268 B2 on Feb 22, 2005 titled “CASCADING CLOSED LOOP CYCLE (CCLC) and Patent 7,096,665 B2 on August 29, 2006 titled “CASCADING CLOSED LOOP CYCLE POWER GENERATION”. These patented technologies are collectively marketed as WOWGen®. The WOW Energies patents represent the production of efficient power from low, medium and high temperature heat generated from the combustion of fuels; heat from renewable energy sources such as solar and geothermal heat; or waste heat sources. Waste heat sources can be in the form of exhaust stack flue gases; waste heat from vented steam or steam discharged from steam turbines; hot water; hot oils or combined waste heat sources. A major advantage of the WOWGen® power plant is the ability to produce power without the use, consumption or contamination of valuable water resources. Production of power from waste heat and renewable energy sources is the most viable path to energy independence from foreign oil and reduced emissions from the combustion of fossil fuels. The WOWGen® power plant inherently reduces emissions and Greenhouse Gases (GHG) by producing power from waste heat without consuming fuel, thus increasing the overall energy efficiency of any industrial plant or power generation facility. The presentation will focus on the technology and provide case studies of its application.

Romero, M.

2008-01-01T23:59:59.000Z

142

ESF GROUND SUPPORT - STRUCTURAL STEEL ANALYSIS  

Science Conference Proceedings (OSTI)

The purpose and objective of this analysis are to expand the level of detail and confirm member sizes for steel sets included in the Ground Support Design Analysis, Reference 5.20. This analysis also provides bounding values and details and defines critical design attributes for alternative configurations of the steel set. One possible configuration for the steel set is presented. This analysis covers the steel set design for the Exploratory Studies Facility (ESF) entire Main Loop 25-foot diameter tunnel.

T. Misiak

1996-06-26T23:59:59.000Z

143

Uranyl Nitrate Flow Loop  

Science Conference Proceedings (OSTI)

The objectives of the work discussed in this report were to: (1) develop a flow loop that would simulate the purified uranium-bearing aqueous stream exiting the solvent extraction process in a natural uranium conversion plant (NUCP); (2) develop a test plan that would simulate normal operation and disturbances that could be anticipated in an NUCP; (3) use the flow loop to test commercially available flowmeters for use as safeguards monitors; and (4) recommend a flowmeter for production-scale testing at an NUCP. There has been interest in safeguarding conversion plants because the intermediate products [uranium dioxide (UO{sub 2}), uranium tetrafluoride (UF{sub 4}), and uranium hexafluoride (UF{sub 6})] are all suitable uranium feedstocks for producing special nuclear materials. Furthermore, if safeguards are not applied virtually any nuclear weapons program can obtain these feedstocks without detection by the International Atomic Energy Agency (IAEA). Historically, IAEA had not implemented safeguards until the purified UF{sub 6} product was declared as feedstock for enrichment plants. H. A. Elayat et al. provide a basic definition of a safeguards system: 'The function of a safeguards system on a chemical conversion plant is in general terms to verify that no useful nuclear material is being diverted to use in a nuclear weapons program'. The IAEA now considers all highly purified uranium compounds as candidates for safeguarding. DOE is currently interested in 'developing instruments, tools, strategies, and methods that could be of use to the IAEA in the application of safeguards' for materials found in the front end of the nuclear fuel cycle-prior to the production of the uranium hexafluoride or oxides that have been the traditional starting point for IAEA safeguards. Several national laboratories, including Oak Ridge, Los Alamos, Lawrence Livermore, and Brookhaven, have been involved in developing tools or techniques for safeguarding conversion plants. This study was sponsored by the U.S. Department of Energy (DOE) NA-241, Office of Dismantlement and Transparency.

Ladd-Lively, Jennifer L [ORNL

2008-10-01T23:59:59.000Z

144

Fusion of Loops for Parallelism and Locality  

Science Conference Proceedings (OSTI)

AbstractżLoop fusion improves data locality and reduces synchronization in data-parallel applications. However, loop fusion is not always legal. Even when legal, fusion may introduce loop-carried dependences which prevent parallelism. In addition, performance ... Keywords: Locality enhancement, loop fusion, cache conflicts, loop transformations, data-parallel applications, scalable shared-memory multiprocessors.

Naraig Manjikian; Tarek S. Abdelrahman

1997-02-01T23:59:59.000Z

145

Transmission Line Grounding  

Science Conference Proceedings (OSTI)

In 2008, the Electric Power Research Institute (EPRI) published a comprehensive grounding report. Published in two parts, the report covered the theoretical and practical aspects of transmission line grounding practices. To further improve the tools available for grounding analysis, an investigation into practical ways to calculate the fault current distribution and ground potential rise of the transmission line grounding system was conducted. Furthermore, a survey of utilities has documented industry pr...

2011-12-23T23:59:59.000Z

146

Loop-deformed Poincaré algebra  

E-Print Network (OSTI)

In this essay we present evidence suggesting that loop quantum gravity leads to deformation of the local Poincar\\'e algebra within the limit of high energies. This deformation is a consequence of quantum modification of effective off-shell hypersurface deformation algebra. Surprisingly, the form of deformation suggests that the signature of space-time changes from Lorentzian to Euclidean at large curvatures. We construct particular realization of the loop-deformed Poincar\\'e algebra and find that it can be related to curved momentum space, which indicates the relationship with recently introduced notion of relative locality. The presented findings open a new way of testing loop quantum gravity effects.

Jakub Mielczarek

2013-04-08T23:59:59.000Z

147

Renewable Energy Opportunities at Yuma Proving Ground, Arizona  

DOE Green Energy (OSTI)

This document provides an overview of renewable resource potential at Yuma Proving Ground, based primarily upon analysis of secondary data sources supplemented with limited on-site evaluations.

Orrell, Alice C.; Kora, Angela R.; Russo, Bryan J.; Williamson, Jennifer L.; Weimar, Mark R.; Gorrissen, Willy J.; Dixon, Douglas R.

2010-06-30T23:59:59.000Z

148

The calculus of looping sequences  

Science Conference Proceedings (OSTI)

We describe the Calculus of Looping Sequences (CLS) which is suitable for modeling microbiological systems and their evolution. We present two extensions, CLS with links (LCLS) and Stochastic CLS. LCLS simplifies the description of protein interaction ...

Roberto Barbuti; Giulio Caravagna; Andrea Maggiolo-Schettini; Paolo Milazzo; Giovanni Pardini

2008-06-01T23:59:59.000Z

149

Time-Constrained Loop Pipelining  

E-Print Network (OSTI)

This paper addresses the problem of Time-Constrained Loop Pipelining, i.e. given a fixed throughput, finding a schedule of a loop which minimizes resource requirements. We propose a methodology, called TCLP, based on dividing the problem into two simpler and independent tasks: retiming and scheduling. TCLP explores different sets of resources, searchingfor a maximum resource utilization. This reduces area requirements. After a minimum set of resourceshas been found, the execution throughput is increased and the number of registers required by the loop schedule is reduced. TCLP attempts to generate a schedule which minimizes cost in time and area (resources and registers). The results show that TCLP obtains optimal schedules in most cases. 1 Introduction This paper presents TCLP, a methodology to solve TimeConstrained Loop Pipelining. TCLP is NP-complete [3]. Two types of timing constraints (TCs) have been considered in the literature: local TCs to specify minimum and/or maximum TCs ...

Fermn Sanchez; Jordi Cortadella

1995-01-01T23:59:59.000Z

150

Introduction to Loop Quantum Gravity  

E-Print Network (OSTI)

The questions I have been asked during the 5th International School on Field Theory and Gravitation, have compelled me to give an account of the premises that I consider important for a beginner's approach to Loop Quantum Gravity. After a description of some general arguments and an introduction to the canonical theory of gravity, I review the background independent approach to quantum gravity, giving only a brief survey of Loop Quantum Gravity.

Mercuri, Simone

2010-01-01T23:59:59.000Z

151

Introduction to Loop Quantum Gravity  

E-Print Network (OSTI)

The questions I have been asked during the 5th International School on Field Theory and Gravitation, have compelled me to give an account of the premises that I consider important for a beginner's approach to Loop Quantum Gravity. After a description of some general arguments and an introduction to the canonical theory of gravity, I review the background independent approach to quantum gravity, giving only a brief survey of Loop Quantum Gravity.

Simone Mercuri

2010-01-08T23:59:59.000Z

152

Electrical Subsurface Grounding Analysis  

SciTech Connect

The purpose and objective of this analysis is to determine the present grounding requirements of the Exploratory Studies Facility (ESF) subsurface electrical system and to verify that the actual grounding system and devices satisfy the requirements.

J.M. Calle

2000-11-01T23:59:59.000Z

153

Free loop spaces in topology and  

E-Print Network (OSTI)

Free loop spaces in topology and physics Kathryn Hess What is the space of free loops? Enumeration of geodesics Hochschild and cyclic homology Homological conformal field theories Free loop spaces in topology Meeting of the Edinburgh Mathematical Society Glasgow, 14 November 2008 #12;Free loop spaces in topology

Thévenaz, Jacques

154

Pomona Loop Baseline Performance Testing.PDF  

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

Pomona Loop Baseline Performance Testing Summary Pomona Loop Baseline Performance Testing Summary The U.S. Department of Energy's Field Operations Program sponsors the Urban and Freeway Pomona Loop range testing in Southern California. The testing is performed by one of the Program's testing partners, Southern California Edison. The vehicles are tested on local city streets (Urban Loop) and four highways (Freeway Loop). The Urban Loop is 19.3 miles long, ranging in elevation from 900 to 1500 feet, with approximately 50 stop signs and traffic lights. The Freeway Loop is 37.2 miles long, ranging in elevation from 700 to 1150 feet, and consists of four connected freeways shaped like a rectangle. When a vehicle is Pomona Loop tested, eight range tests are performed, with four tests on the Urban Loop and four on the Freeway Loop. The range tests are performed

155

Severe accident sequences analyzed for a two-loop PWR  

Science Conference Proceedings (OSTI)

Different severe accident sequences have been analyzed for a two-loop Westinghouse pressurized water reactor (PWR) using the MELCOR code, version 1.8.4. The purpose of this study was to calculate source terms and the timing of events for severe accident sequences at this type of PWR to be used in the HAS-CAL code .The results calculated by MELCOR have been compared to results from the individual plant examination (IPE) of the Kewaunee nuclear power plant, also a two-loop Westinghouse PWR. The results of the Kewaunee IPE were obtained with the severe accident code MAAP.

Carbajo, J.J. [Oak Ridge National Lab., TN (United States)

1997-12-01T23:59:59.000Z

156

Advanced Neutron Source (ANS) Project progress report  

SciTech Connect

This report discusses the following topics on the advanced neutron source: quality assurance (QA) program; reactor core development; fuel element specification; corrosion loop tests and analyses; thermal-hydraulic loop tests; reactor control concepts; critical and subcritical experiments; material data, structural tests, and analysis; cold source development; beam tube, guide, and instrument development; hot source development; neutron transport and shielding; I C research and development; facility concepts; design; and safety.

McBee, M.R.; Chance, C.M. (eds.) (Oak Ridge National Lab., TN (USA)); Selby, D.L.; Harrington, R.M.; Peretz, F.J. (Oak Ridge National Lab., TN (USA))

1990-04-01T23:59:59.000Z

157

Loop Current and Deep Eddies  

Science Conference Proceedings (OSTI)

In contrast to the Loop Current and rings, much less is known about deep eddies (deeper than 1000 m) of the Gulf of Mexico. In this paper, results from a high-resolution numerical model of the Gulf are analyzed to explain their origin and how ...

L-Y. Oey

2008-07-01T23:59:59.000Z

158

Electrical grounding prong socket  

SciTech Connect

The invention is a socket for a grounding prong used in a three prong electrical plug and a receptacle for the three prong plug. The socket being sufficiently spacious to prevent the socket from significantly stretching when a larger, U-shaped grounding prong is inserted into the socket, and having a ridge to allow a snug fit when a smaller tubular shape grounding prong is inserted into the socket.

Leong, Robert (Dublin, CA)

1991-01-01T23:59:59.000Z

159

Predaceous Ground Beetles  

E-Print Network (OSTI)

Predaceous ground beetles can be a nuisance to homeowners, especially when they are numerous. This publication describes the beetles and discusses ways to prevent and treat them.

Sansone, Chris; Minzenmayer, Rick

2003-06-30T23:59:59.000Z

160

Substation grounding programs  

SciTech Connect

This document is a users manual and applications guide for the software package SGA. This package comprises four computer programs, namely SOMIP, SMECC, SGSYS, and TGRND. The first three programs are analysis models which are to be used in the design process of substation grounding systems. The fourth program, TGRND, is an analysis program for determining the transient response of a grounding system. This report, Volume 3, is a users manual and an installation and validation manual for the computer program SGSYS (Substation Grounding SYStem Analysis Program). This program analyzes the substation ground field given the total electric current injected into the ground field and the design of the grounding system. Standard outputs of the program are (1) total ground resistance, (2) step voltage, (3) touch voltage, (4) voltages on a grid of points, (5) voltage profile along straight lines, (6) transfer voltages, (7) ground potential rise, (8) body currents, (9) step voltage profile along straight lines, and (10) touch voltage profile along straight lines. This program can be utilized in an interactive or batch mode. In the interactive mode, the user defines the grounding system geometry, soil parameters, and output requests interactively, with the use of a user friendly conversational program. The users manual describes data requirements and data preparation procedures. An appendix provides forms which facilitate data collection procedures. The installation and validation manual describes the computer files which make up the program SGSYS and provides a test case for validation purposes.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). Electric Power Lab.)

1992-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

History of Residential Grounding  

Science Conference Proceedings (OSTI)

This report describes the development of residential electrical service grounding practices in the United States. The report focuses on the history of the National Electrical Code (NEC), which prescribes standards for wiring practices in residences, including grounding of the building electrical service.

2002-09-19T23:59:59.000Z

162

Ways of grounding imagination  

Science Conference Proceedings (OSTI)

This paper discusses and evaluates use of different participatory design methods in relation to addressing the challenge of grounding imagination. It presents reflections on the use of three participatory design methods, deployed in the WorkSpace project: ... Keywords: PD methods, analytical triangulation, bricolage, future laboratory, grounding imagination, in-situ prototyping experiments

Monika Büscher; Mette Agger Eriksen; Jannie Friis Kristensen; Preben Holst Mogensen

2004-07-01T23:59:59.000Z

163

Renewable Energy Opportunties at Dugway Proving Ground, Utah  

DOE Green Energy (OSTI)

This document provides an overview of renewable resource potential at Dugway Proving Ground, based primarily upon analysis of secondary data sources supplemented with limited on-site evaluations. This effort focuses on grid-connected generation of electricity from renewable energy sources and ground source heat pumps (GSHPs). The effort was funded by the U.S. Army Installation Management Command (IMCOM) as follow-on to the 2005 Department of Defense (DoD) Renewables Assessment.

Orrell, Alice C.; Kora, Angela R.; Russo, Bryan J.; Horner, Jacob A.; Williamson, Jennifer L.; Weimar, Mark R.; Gorrissen, Willy J.; Nesse, Ronald J.; Dixon, Douglas R.

2010-05-31T23:59:59.000Z

164

Hard thermal loops in static external fields  

E-Print Network (OSTI)

We study, in the imaginary-time formalism, the high temperature behavior of n-point thermal loops in static Yang-Mills and gravitational fields. We show that in this regime, any hard thermal loop gives the same leading contribution as the one obtained by evaluating the loop at zero external energies and momenta.

Frenkel, J; Takahashi, N

2009-01-01T23:59:59.000Z

165

DC source assemblies  

SciTech Connect

Embodiments of DC source assemblies of power inverter systems of the type suitable for deployment in a vehicle having an electrically grounded chassis are provided. An embodiment of a DC source assembly comprises a housing, a DC source disposed within the housing, a first terminal, and a second terminal. The DC source also comprises a first capacitor having a first electrode electrically coupled to the housing, and a second electrode electrically coupled to the first terminal. The DC source assembly further comprises a second capacitor having a first electrode electrically coupled to the housing, and a second electrode electrically coupled to the second terminal.

Campbell, Jeremy B; Newson, Steve

2013-02-26T23:59:59.000Z

166

Chemical Looping for Combustion and Hydrogen Production  

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

ChemiCal looping for Combustion and ChemiCal looping for Combustion and hydrogen produCtion Objective The objective of this project is to determine the benefits of chemical looping technology used with coal to reduce CO 2 emissions. Background Chemical looping is a new method to convert coal or gasified coal to energy. In chemical looping, there is no direct contact between air and fuel. The chemical looping process utilizes oxygen from metal oxide oxygen carrier for fuel combustion, or for making hydrogen by "reducing" water. In combustion applications, the products of chemical looping are CO 2 and H 2 O. Thus, once the steam is condensed, a relatively pure stream of CO 2 is produced ready for sequestration. The production of a sequestration ready CO 2 stream does not require any additional separation units

167

High-temperature helium-loop facility  

Science Conference Proceedings (OSTI)

The high-temperature helium loop is a facility for materials testing in ultrapure helium gas at high temperatures. The closed loop system is capable of recirculating high-purity helium or helium with controlled impurities. The gas loop maximum operating conditions are as follows: 300 psi pressure, 500 lb/h flow rate, and 2100/sup 0/F temperature. The two test sections can accept samples up to 3.5 in. diameter and 5 ft long. The gas loop is fully instrumented to continuously monitor all parameters of loop operation as well as helium impurities. The loop is fully automated to operate continuously and requires only a daily servicing by a qualified operator to replenish recorder charts and helium makeup gas. Because of its versatility and high degree of parameter control, the helium loop is applicable to many types of materials research. This report describes the test apparatus, operating parameters, peripheral systems, and instrumentation system.

Tokarz, R.D.

1981-09-01T23:59:59.000Z

168

Handling effluent from nuclear thermal propulsion system ground tests  

SciTech Connect

A variety of approaches for handling effluent from nuclear thermal propulsion system ground tests in an environmentally acceptable manner are discussed. The functional requirements of effluent treatment are defined and concept options are presented within the framework of these requirements. System concepts differ primarily in the choice of fission-product retention and waste handling concepts. The concept options considered range from closed cycle (venting the exhaust to a closed volume or recirculating the hydrogen in a closed loop) to open cycle (real time processing and venting of the effluent). This paper reviews the different methods to handle effluent from nuclear thermal propulsion system ground tests.

Shipers, L.R.; Allen, G.C.

1992-09-09T23:59:59.000Z

169

Effluent treatment options for nuclear thermal propulsion system ground tests  

DOE Green Energy (OSTI)

A variety of approaches for handling effluent from nuclear thermal propulsion system ground tests in an environmentally acceptable manner are discussed. The functional requirements of effluent treatment are defined and concept options are presented within the framework of these requirements. System concepts differ primarily in the choice of fission-product retention and waste handling concepts. The concept options considered range from closed cycle (venting the exhaust to a closed volume or recirculating the hydrogen in a closed loop) to open cycle (real time processing and venting of the effluent). This paper reviews the strengths and weaknesses of different methods to handle effluent from nuclear thermal propulsion system ground tests.

Shipers, L.R.; Brockmann, J.E.

1992-10-16T23:59:59.000Z

170

REVIEW OF LITERATURE AND A PRELIMINARY EXPERIMENTAL INVESTIGATION ON START-UP INSTABILITIES IN AN R-11 THERMOSIPHON LOOP WITH  

E-Print Network (OSTI)

refrigeration system include: (1) absence of moving parts leading to a more reliable system operation, 1 Current, with the addition of a liquid circulating pump in a thermosiphon loop, higher heat transfer coefficients associated loop transfers heat from a hot source to a cold sink through the evaporation and condensation

Kandlikar, Satish

171

Micro loop heat pipe evaporator coherent pore structures  

E-Print Network (OSTI)

Loop heat pipes seem a promising approach for application in modern technologies where such thermal devices as cooling fans and radiators cannot satisfy overall requirements. Even though a loop heat pipe has a big potential to remove the thermal energy from a high heat flux source, the heat removal performance of heat pipes cannot be predicted well since a first principles of evaporation has not been established. An evaporation model based on statistical rate theory has been recently suggested by Ward and developed for a single pore by Oinuma. A loop heat pipe with coherent pore wick structure has been proposed as a design model. To limit product development risk and to enhance performance assurance, design model features and performance parameters have been carefully reviewed during the concept development phase and have been deliberately selected so as to be well-founded on the limited existing loop heat pipe knowledge base. A first principles evaporation model has been applied for evaporator geometry optimization. A number of iteration calculations have been performed to satisfy design and operating limitations. A set of recommendations for design optimization has been formulated. An optimal model has been found and proposed for manufacture and experimental investigation.

Alexseev, Alexandre Viktorovich

2003-08-01T23:59:59.000Z

172

Substation Grounding Grids  

Science Conference Proceedings (OSTI)

This report is an account of research performed by the Electric Power Research Institute (EPRI) in 2011 on the subject of degradation of buried grounding grids in electric power substations. Substation ground grids are usually made of copper conductors, which are placed below grade and are joined together and to the above-grade structures with various types of connectors. While above-grade connections are visible and may be inspected, below-grade connections are not visible or readily accessible for insp...

2011-12-22T23:59:59.000Z

173

EPRI Substation Grounding Project  

Science Conference Proceedings (OSTI)

The Electric Power Research Institute (EPRI) has been conducting research in the area of substation grounding and fault current management for several decades. This research has resulted in a large number of reports and other products. To help users locate the results of EPRI’s research in substation grounding and fault current management, an annual update is prepared containing brief descriptions of the products.ObjectiveThe objective of this report is ...

2012-09-06T23:59:59.000Z

174

Substation grounding programs  

SciTech Connect

This document is a users manual and applications guide for the software package SGA. This package comprises four computer programs, namely SOMIP, SMECC, SGSYS, and TGRND. The first three programs are analysis models which are to be used in the design process of substation grounding systems. The fourth program, TGRND, is an analysis program for determining the transient response of a grounding system. This report, Volume 2, is a users manual and an installation and validation manual for the computer program SMECC (Substation Maximum Earth Current Computation Program). This program analyzes the electric current distribution among grounded structures inside and outside a substation for different fault conditions. The fault conditions are automatically selected by the program, or they may be specified by the user, or both. The fault condition resulting in maximum substation earth current is identified and reported. Data requirements for this program are: ground impedance, transformer data, transmission line data, transmission line grounding impedances, etc. The program provides four types of standard outputs: (1) a report of voltages and current flow in the unfaulted system, (2) a brief report of the maximum ground potential rise (worst fault condition), (3) a summary report of all fault conditions which have been analyzed by the program, and (4) a detailed report of voltages and current flow for a selected set of fault conditions.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). Electric Power Lab.)

1992-05-01T23:59:59.000Z

175

Examination of Compatibility of Potentially Cavitation-Resistant Modifications of Type 316LN Stainless Steel with Mercury in a Thermal Convection Loop  

Science Conference Proceedings (OSTI)

A 316L stainless steel thermal convection loop (TCL) containing a variety of stainless steel coupons circulated mercury for 2000 h. The TCL conditions included a maximum temperature of 307 C, a maximum temperature gradient of 90 C, and a Hg velocity of about 1.4 m/min. In addition to mill-annealed/surface-ground 316LN coupons serving as the baseline material, other coupons included 316LN that was 50% cold-worked, 316LN that was given a proprietary surface hardening treatment termed ''kolsterizing,'' and Nitronic 60. The purpose of this test was to examine Hg compatibility with these modest variations of annealed 31 6LN stainless steel that are considered potential improvements over annealed 31 6LN for cavitation-erosion resistance in the Spallation Neutron Source (SNS) target containment system. The results indicated negligible weight change for each coupon type, no significant indication of attack or surface roughening, and generally no interaction with Hg.

Pawel, SJ

2002-08-29T23:59:59.000Z

176

Loop model with mixed boundary conditions, qKZ equation and alternating sign matrices  

E-Print Network (OSTI)

The integrable loop model with mixed boundary conditions based on the 1-boundary extended Temperley--Lieb algebra with loop weight 1 is considered. The corresponding qKZ equation is introduced and its minimal degree solution described. As a result, the sum of the properly normalized components of the ground state in size L is computed and shown to be equal to the number of Horizontally and Vertically Symmetric Alternating Sign Matrices of size 2L+3. A refined counting is also considered.

P. Zinn-Justin

2006-10-25T23:59:59.000Z

177

Guide for Transmission Line Grounding  

Science Conference Proceedings (OSTI)

Electrical utilities have a duty to provide effective grounding for managing steady-state and fault currents, whether near a large generating station or at a remote distribution pole ground. For transmission lines, this imperative is usually met with investment in overhead ground wires and grounding electrodes. Effective grounding at each tower improves reliability8212by providing low path impedance to lightning strokes8212and contributes to safety. However, the fundamental physical parameters in ground ...

2007-12-20T23:59:59.000Z

178

U.S. DEPARTMENT OF ENERGY - NETL CATEGORICAL EXCLUSION (CX) DESIGNATIO...  

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

CT Geothermal Incentive Program Design and installation of closed loop ground source heat pump system for Milano residence. Ground loops to be installed on site and...

179

Video looping of human cyclic motion  

E-Print Network (OSTI)

In this thesis, a system called Video Looping is developed to analyze human cyclic motions. Video Looping allows users to extract human cyclic motion from a given video sequence. This system analyzes similarities from a large amount of live footage to find the point of smooth transition. The final cyclic loop is created using only a few output images. Video Looping is useful not only to learn and understand human movements, but also to apply the cyclic loop to various artistic applications. To provide practical animation references, the output images are presented as photo plate sequences to visualize human cyclic motion similar to Eadweard Muybridge's image sequences. The final output images can be used to create experimental projects such as composited multiple video loops or small size of web animations. Furthermore, they can be imported into animation packages, and animators can create keyframe animations by tracing them in 3D software.

Choi, Hye Mee

2006-05-01T23:59:59.000Z

180

Magnetic monopole in the loop representation  

Science Conference Proceedings (OSTI)

We quantize, within the Loop Representation formalism, the electromagnetic field in the presence of a static magnetic pole. It is found that the loop-dependent physical wave functionals of the quantum Maxwell theory become multivalued, through a topological phase factor depending on the solid angle subtended at the monopole by a surface bounded by the loop. It is discussed how this fact generalizes what occurs in ordinary quantum mechanics in multiply connected spaces.

Leal, Lorenzo; Lopez, Alexander [Grupo de Campos y Particulas, Departamento de Fisica, Facultad de Ciencias, Universidad Central de Venezuela, AP 47270, Caracas 1041-A (Venezuela); Centro de Fisica, Instituto Venezolano de Investigaciones Cientificas, AP 21827, Caracas 1020-A, Venezuela, and Grupo de Campos y Particulas, Departamento de Fisica, Facultad de Ciencias, Universidad Central de Venezuela (Venezuela)

2006-01-15T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

LMFBR with booster pump in pumping loop  

DOE Patents (OSTI)

A loop coolant circulation system is described for a liquid metal fast breeder reactor (LMFBR) utilizing a low head, high specific speed booster pump in the hot leg of the coolant loop with the main pump located in the cold leg of the loop, thereby providing the advantages of operating the main pump in the hot leg with the reliability of cold leg pump operation.

Rubinstein, H.J.

1975-10-14T23:59:59.000Z

182

Coal Direct Chemical Looping (CDCL) Process Development  

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

Coal Direct Chemical Looping (CDCL) Retrofit to Pulverized Coal Power Plants for In-Situ CO 2 Capture William G. Lowrie Department of Chemical & Biomolecular Engineering The Ohio...

183

Aircraft Thermal Management Using Loop Heat Pipes.  

E-Print Network (OSTI)

??The objective of this thesis was to determine the feasibility of using loop heat pipes to dissipate waste heat from power electronics to the skin… (more)

Fleming, Andrew J.

2009-01-01T23:59:59.000Z

184

Transmission of energy by open-loop chemical energy pipeline  

DOE Green Energy (OSTI)

The primary objective of this program is to evaluate the technical feasibility and, in a preliminary fashion, the economic viability of transmitting and storing energy by an open-loop modification of the reversible chemical energy pipeline system known as EVA/ADAM. The work designed to achieve this objective includes: (1) the preliminary design of a nuclear (HTGR) and methane-based open-loop system; (2) evaluation of energy sources as alternatives to those in the preliminary design (e.g., coal gasification and HTGR/LNG); (3) assessment of the feasibility of using existing natural gas pipelines and storage systems for the synthesis gas; (4) assessment of existing methanation technologies and interchangeability of the SNG with natural gas; (5) evaluation of the various alternative energy end-uses for heat, SNG, and electricity; and (6) development of two conceptual designs and evaluation of their economics and environmental impacts.

Baker, N R

1977-01-01T23:59:59.000Z

185

Substation grounding programs  

SciTech Connect

This document is a users manual and applications guide for the software package SGA. This package comprises four computer programs, namely SOMIP, SMECC, SGSYS, and TGRND. The first three programs are analysis models which are to be used in the design process of substation grounding systems. The fourth program, TGRND, is an analysis program for determining the transient response of a grounding system. This report, Volume 5, is an applications guide of the three computer programs. SOMIP, SMECC, and SGSYS, for the purpose of designing a safe substation grounding system. The applications guide utilizes four example substation grounding systems for the purpose of illustrating the application of the programs, SOMIP, SMECC, and SGSYS. The examples are based on data provided by four contributing utilities, namely, Houston Lighting and Power Company, Southern Company Services, Puget Sound Power and Light Company, and Arizona Public Service Company. For the purpose of illustrating specific capabilities of the computer programs, the data have been modified. As a result, the final designs of the four systems do not necessarily represent actual grounding system designs by these utilities. The example system 1 is a 138 kV/35 kV distribution substation. The example system 2 is a medium size 230 kV/115 kV transmission substation. The third example system is a generation substation while the last is a large 525 kV/345 kV/230 kV transmission substation. The four examples cover most of the practical problems that a user may encounter in the design of substation grounding systems.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). Electric Power Lab.)

1992-05-01T23:59:59.000Z

186

Substation Ground Grid Impedance Measurement  

Science Conference Proceedings (OSTI)

Because safety impacts all segments of the electric power industry, the integrity and conformance to standards of substation grounding systems is of paramount importance. This report summarizes field demonstrations of commercially available meters for performance evaluation of large grounding systems, including the EPRI Ground Grid Evaluator (commercially known as the Smart Ground Multimeter or SGM).

2007-12-13T23:59:59.000Z

187

UWB communication receiver feedback loop  

DOE Patents (OSTI)

A novel technique and structure that maximizes the extraction of information from reference pulses for UWB-TR receivers is introduced. The scheme efficiently processes an incoming signal to suppress different types of UWB as well as non-UWB interference prior to signal detection. Such a method and system adds a feedback loop mechanism to enhance the signal-to-noise ratio of reference pulses in a conventional TR receiver. Moreover, sampling the second order statistical function such as, for example, the autocorrelation function (ACF) of the received signal and matching it to the ACF samples of the original pulses for each transmitted bit provides a more robust UWB communications method and system in the presence of channel distortions.

Spiridon, Alex (Palo Alto, CA); Benzel, Dave (Livermore, CA); Dowla, Farid U. (Castro Valley, CA); Nekoogar, Faranak (San Ramon, CA); Rosenbury, Erwin T. (Castro Valley, CA)

2007-12-04T23:59:59.000Z

188

Consistent probabilities in loop quantum cosmology  

E-Print Network (OSTI)

A fundamental issue for any quantum cosmological theory is to specify how probabilities can be assigned to various quantum events or sequences of events such as the occurrence of singularities or bounces. In previous work, we have demonstrated how this issue can be successfully addressed within the consistent histories approach to quantum theory for Wheeler-DeWitt-quantized cosmological models. In this work, we generalize that analysis to the exactly solvable loop quantization of a spatially flat, homogeneous and isotropic cosmology sourced with a massless, minimally coupled scalar field known as sLQC. We provide an explicit, rigorous and complete decoherent histories formulation for this model and compute the probabilities for the occurrence of a quantum bounce vs. a singularity. Using the scalar field as an emergent internal time, we show for generic states that the probability for a singularity to occur in this model is zero, and that of a bounce is unity, complementing earlier studies of the expectation values of the volume and matter density in this theory. We also show from the consistent histories point of view that all states in this model, whether quantum or classical, achieve arbitrarily large volume in the limit of infinite `past' or `future' scalar `time', in the sense that the wave function evaluated at any arbitrary fixed value of the volume vanishes in that limit. Finally, we briefly discuss certain misconceptions concerning the utility of the consistent histories approach in these models.

David A. Craig; Parampreet Singh

2013-06-26T23:59:59.000Z

189

Improved Smart Ground Multimeter  

Science Conference Proceedings (OSTI)

The Smart Ground Multimeter (SGM) underwent three major redesigns since its original development in the early 1980s. This report describes the latest redesign and provides useful tips on the assessment of measured data quality and on resolving measurement problems in the field.

2006-12-18T23:59:59.000Z

190

Substation grounding programs  

SciTech Connect

The five volume report comprises the user manual, installation, and validation manual and an applications guide for the SGA (Substation Grounding Analysis) software package. SGA consists of four computer programs: (1) SOMIP, (2) SMECC, (3) SGSYS, and (4) TGRND. The first three programs provide a comprehensive analysis tool for the design of substation grounding systems to meet safety standards. The fourth program, TGRND, provides a state of the art analysis tool for computing transient ground potential rise and ground system impedance. This part of the report, Volume 1, is a users manual and an installation and validation manual for the computer program SOMIP (SOil Measurement Interpretation Program). This program computes the best estimate of the parameters of a two layer soil model from usual soil resistivity measurements. Four pin or three pin soil measurements can be accommodated. In addition, it provides error bounds on the soil parameters for a given confidence level. The users manual describes data requirements and data preparation procedures. The installation and validation manual describes the computer files which make up the program SOMIP and provides two test cases for validation purposes. 4 refs.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). School of Electrical Engineering)

1992-05-01T23:59:59.000Z

191

Slack analysis in the system design loop  

Science Conference Proceedings (OSTI)

We present a system-level technique to analyze the impact of design optimizations on system-level timing dependencies. This technique enables us to speed up the design cycle by substituting, in the design the loop, the time-consuming simulation step ... Keywords: slack analysis, system design loop, timing update

Girish Venkataramani; Seth C. Goldstein

2008-10-01T23:59:59.000Z

192

Coronal loop detection from solar images  

Science Conference Proceedings (OSTI)

In this paper, we make an overview of a methodology for the automatic retrieval of images with coronal loops from the solar image data captured by the extreme-ultraviolet imaging telescope (EIT) onboard the spacecraft SOHO (Solar and Heliospheric Observatory). ... Keywords: Classification techniques, Coronal loop, Curvature feature, Data mining, Feature extraction, Image retrieval, Solar images

Nurcan Durak; Olfa Nasraoui; Joan Schmelz

2009-11-01T23:59:59.000Z

193

Hard thermal loops in static background fields  

E-Print Network (OSTI)

We discuss the high temperature behavior of retarded thermal loops in static external fields. We employ an analytic continuation of the imaginary time formalism and use a spectral representation of the thermal amplitudes. We show that, to all orders, the leading contributions of static hard thermal loops can be directly obtained by evaluating them at zero external energies and momenta.

Brandt, F T; Siqueira, J B

2013-01-01T23:59:59.000Z

194

Newtonian gravity in loop quantum gravity  

E-Print Network (OSTI)

We apply a recent argument of Verlinde to loop quantum gravity, to conclude that Newton's law of gravity emerges in an appropriate limit and setting. This is possible because the relationship between area and entropy is realized in loop quantum gravity when boundaries are imposed on a quantum spacetime.

Smolin, Lee

2010-01-01T23:59:59.000Z

195

Is the Loop Current a Chaotic Oscillator?  

Science Conference Proceedings (OSTI)

Dynamical systems theory is employed to study the irregular Loop Current in the Gulf of Mexico using a short database of shedding periods and north–south positions of the current. Two independent tests based on these data suggest that the Loop ...

Alexis Lugo-Fernández

2007-06-01T23:59:59.000Z

196

Efficient Hardware Looping Units for FPGAs  

Science Conference Proceedings (OSTI)

Looping operations impose a significant bottleneck to achieving better computational efficiency for embedded applications. To confront this problem in embedded computation either in the form of programmable processors or FSMD (Finite-State Machine with ... Keywords: FPGA, embedded system, high-level synthesis, hardware looping, control unit

Nikolaos Kavvadias; Konstantinos Masselos

2010-07-01T23:59:59.000Z

197

Coal Direct Chemical Looping (CDCL) Process Development  

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

Direct Chemical Looping (CDCL) Retrofit to Direct Chemical Looping (CDCL) Retrofit to Pulverized Coal Power Plants for In-Situ CO 2 Capture William G. Lowrie Department of Chemical & Biomolecular Engineering The Ohio State University Columbus, OH 43210 Award #: DE-NT0005289 PI: Liang-Shih Fan Presenter: Samuel Bayham Department of Chemical and Biomolecular Engineering The Ohio State University 2013 NETL CO2 Capture Technology Meeting July 11, 2013 Pittsburgh, PA Clean Coal Research Laboratory at The Ohio State University Sub-Pilot Scale Unit 250kW th Pilot Unit (Wilsonville, Alabama) Syngas Chemical Looping Coal-Direct Chemical Looping Cold Flow Model Sub-Pilot Scale Unit HPHT Slurry Bubble Column 120kW th Demonstration Unit Calcium Looping Process CCR Process Sub-Pilot Unit F-T Process

198

Dual quark condensate and dressed Polyakov loops  

E-Print Network (OSTI)

We construct a new order parameter for finite temperature QCD by considering the quark condensate for U(1)-valued temporal boundary conditions for the fermions. Fourier transformation with respect to the boundary condition defines the dual condensate. This quantity corresponds to an equivalence class of Polyakov loops, thereby being an order parameter for the center symmetry. We explore the duality relation between the quark condensate and these dressed Polyakov loops numerically, using quenched lattice QCD configurations below and above the QCD phase transition. It is demonstrated that the Dirac spectrum responds differently to changing the boundary condition, in a manner that reproduces the expected Polyakov loop pattern. We find the dressed Polyakov loops to be dominated by the lowest Dirac modes, in contrast to thin Polyakov loops investigated earlier.

Erek Bilgici; Falk Bruckmann; Christof Gattringer; Christian Hagen

2008-01-28T23:59:59.000Z

199

Closed loop computer control for an automatic transmission  

DOE Patents (OSTI)

In an automotive vehicle having an automatic transmission that driveably connects a power source to the driving wheels, a method to control the application of hydraulic pressure to a clutch, whose engagement produces an upshift and whose disengagement produces a downshift, the speed of the power source, and the output torque of the transmission. The transmission output shaft torque and the power source speed are the controlled variables. The commanded power source torque and commanded hydraulic pressure supplied to the clutch are the control variables. A mathematical model is formulated that describes the kinematics and dynamics of the powertrain before, during and after a gear shift. The model represents the operating characteristics of each component and the structural arrangement of the components within the transmission being controlled. Next, a close loop feedback control is developed to determine the proper control law or compensation strategy to achieve an acceptably smooth gear ratio change, one in which the output torque disturbance is kept to a minimum and the duration of the shift is minimized. Then a computer algorithm simulating the shift dynamics employing the mathematical model is used to study the effects of changes in the values of the parameters established from a closed loop control of the clutch hydraulic and the power source torque on the shift quality. This computer simulation is used also to establish possible shift control strategies. The shift strategies determined from the prior step are reduced to an algorithm executed by a computer to control the operation of the power source and the transmission.

Patil, Prabhakar B. (Detroit, MI)

1989-01-01T23:59:59.000Z

200

Ground State Entanglement Energetics  

E-Print Network (OSTI)

We consider the ground state of simple quantum systems coupled to an environment. In general the system is entangled with its environment. As a consequence, even at zero temperature, the energy of the system is not sharp: a projective measurement can find the system in an excited state. We show that energy fluctuation measurements at zero temperature provide entanglement information. For two-state systems which exhibit a persistent current in the ground state, energy fluctuations and persistent current fluctuations are closely related. The harmonic oscillator serves to illustrate energy fluctuations in a system with an infinite number of states. In addition to the energy distribution we discuss the energy-energy time-correlation function in the zero-temperature limit.

M. Buttiker; A. N. Jordan

2005-01-04T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

CEUS Ground Motion Project  

Science Conference Proceedings (OSTI)

Three utilities are currently pursuing early site permits (ESPs) for possible siting of new nuclear power plant facilities in the central and eastern United States (CEUS). The geological, seismological, and engineering characteristics of a site and its environs must be investigated in sufficient scope and detail. These investigations are needed to adequately evaluate a proposed site and to provide sufficient information for estimating the site's safe shutdown earthquake (SSE) ground motion. Nuclear Regul...

2003-12-02T23:59:59.000Z

202

Ground Squirrels and Gophers  

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

Squirrels and Gophers Squirrels and Gophers Nature Bulletin No. 224-A April 2, 1966 Forest Preserve District of Cook County Seymour Simon, President Roland F. Eisenbeis, Supt. of Conservation GROUND SQUIRRELS AND GOPHERS On sunny summer days, a dusty-colored animal with yellowish and brown stripes, about the size of a small rat, often may be noticed creeping through the grass of prairies, pastures, golf courses or lawns. Watch him. He pauses every few feet to sit up, look and listen for a moment. Nervous and timid, he crouches low at every distant sound or passing shadow. Startle him and he scurries away, and then may suddenly halt and freeze, bolt upright, as stiff and straight as a stake driven in the ground. If approached, he gives a loud shrill trilling whistle and, with a flip of his tail, pops out of sight. Watch that spot closely and, in less than a minute, a snaky head appears. Be quiet. He has many enemies above ground and he also has a lot of curiosity. Presently he sits up upon his haunches again.

203

A Surface-Corrected Gaussian Model for Elevated Sources  

Science Conference Proceedings (OSTI)

A Gaussian model for continuous elevated sources is developed which uses a continuous distribution of ground-level sources to replace the use of the image source. For the case of Fickian diffusion with uniform wind, this model is mathematically ...

Thomas J. Overcamp

1983-06-01T23:59:59.000Z

204

Novel Reactor Design for Solid Fuel Chemical Looping Combustion  

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

for Solid Fuel Chemical Looping Combustion Opportunity Research is active on the patent pending technology, titled "Apparatus and Method for Solid Fuel Chemical Looping...

205

Development of numerical models of vertical ground heat exchangers and experimental verification : domain decomposition and state model reduction approach.  

E-Print Network (OSTI)

??Ground-source heat pump systems with vertical ground heat exchangers (GHE) are gaining popularity worldwide for their higher coefficients of performance and lower CO2 emissions. However,… (more)

KIM, Eui-Jong

2011-01-01T23:59:59.000Z

206

Hybrid Combustion-Gasification Chemical Looping  

DOE Green Energy (OSTI)

For the past several years Alstom Power Inc. (Alstom), a leading world-wide power system manufacturer and supplier, has been in the initial stages of developing an entirely new, ultra-clean, low cost, high efficiency power plant for the global power market. This new power plant concept is based on a hybrid combustion-gasification process utilizing high temperature chemical and thermal looping technology The process consists of the oxidation, reduction, carbonation, and calcination of calcium-based compounds, which chemically react with coal, biomass, or opportunity fuels in two chemical loops and one thermal loop. The chemical and thermal looping technology can be alternatively configured as (i) a combustion-based steam power plant with CO{sub 2} capture, (ii) a hybrid combustion-gasification process producing a syngas for gas turbines or fuel cells, or (iii) an integrated hybrid combustion-gasification process producing hydrogen for gas turbines, fuel cells or other hydrogen based applications while also producing a separate stream of CO{sub 2} for use or sequestration. In its most advanced configuration, this new concept offers the promise to become the technology link from today's Rankine cycle steam power plants to tomorrow's advanced energy plants. The objective of this work is to develop and verify the high temperature chemical and thermal looping process concept at a small-scale pilot facility in order to enable AL to design, construct and demonstrate a pre-commercial, prototype version of this advanced system. In support of this objective, Alstom and DOE started a multi-year program, under this contract. Before the contract started, in a preliminary phase (Phase 0) Alstom funded and built the required small-scale pilot facility (Process Development Unit, PDU) at its Power Plant Laboratories in Windsor, Connecticut. Construction was completed in calendar year 2003. The objective for Phase I was to develop the indirect combustion loop with CO{sub 2} separation, and also syngas production from coal with the calcium sulfide (CaS)/calcium sulfate (CaSO{sub 4}) loop utilizing the PDU facility. The results of Phase I were reported in Reference 1, 'Hybrid Combustion-Gasification Chemical Looping Coal Power Development Technology Development Phase I Report' The objective for Phase II was to develop the carbonate loop--lime (CaO)/calcium carbonate (CaCO{sub 3}) loop, integrate it with the gasification loop from Phase I, and ultimately demonstrate the feasibility of hydrogen production from the combined loops. The results of this program were reported in Reference 3, 'Hybrid Combustion-Gasification Chemical Looping Coal Power Development Technology Development Phase II Report'. The objective of Phase III is to operate the pilot plant to obtain enough engineering information to design a prototype of the commercial Chemical Looping concept. The activities include modifications to the Phase II Chemical Looping PDU, solids transportation studies, control and instrumentation studies and additional cold flow modeling. The deliverable is a report making recommendations for preliminary design guidelines for the prototype plant, results from the pilot plant testing and an update of the commercial plant economic estimates.

Herbert Andrus; Gregory Burns; John Chiu; Gregory Lijedahl; Peter Stromberg; Paul Thibeault

2009-01-07T23:59:59.000Z

207

LISA and ground-based detectors for gravitational waves: An overview  

Science Conference Proceedings (OSTI)

The gravitational wave spectrum covers many decades in frequency. Sources in the audio-frequency regime above 1 Hz are accessible to ground-based detectors while sources in the low-frequency regime can only be observed from space because of the unshieldable background of local gravitational noise on the ground and because ground-based interferometers are limited in length to a few kilometers. Laser interferometry is a promising technique to observe the minute distance changes caused by gravitational waves

Karsten Danzmann LISA Study Team

1998-01-01T23:59:59.000Z

208

EPA Final Ground Water Rule Available Online, 3/07 | Department of Energy  

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

EPA Final Ground Water Rule Available Online, 3/07 EPA Final Ground Water Rule Available Online, 3/07 EPA Final Ground Water Rule Available Online, 3/07 On November 8, 2006, the U.S. Environmental Protection Agency (EPA) published a final Ground Water Rule (GWR) to promote increased protection against microbial pathogens that may be present in public water systems (PWSs) that use ground water sources for their supply (these systems are known as ground water systems). This Rule establishes a risk-targeted approach to focus on ground water systems that are susceptible to fecal contamination, and requires ground water systems that are at risk of fecal contamination to take corrective action. A minor correction to the final Rule was published on November 21, 2006 (71 FR 67427). The GWR applies to all PWSs2 that use ground water

209

GROUND WATER PROTECTION ISSUES WITH GEOTHERMAL HEAT PUMPS  

DOE Green Energy (OSTI)

Closed loop vertical boreholes used with geothermal heat pumps are grouted to facilitate heat transfer and prevent ground water contamination. The grout must exhibit suitable thermal conductivity as well as adequate hydraulic sealing characteristics. Permeability and infiltration tests were performed to assess the ability of cementitious grout to control vertical seepage in boreholes. It was determined that a superplasticized cement-sand grout is a more effective borehole sealant than neat cement over a range of likely operational temperatures. The feasibility of using non-destructive methods to verify bonding in heat exchangers is reviewed.

ALLAN,M.L.; PHILIPPACOPOULOS,A.J.

1999-10-01T23:59:59.000Z

210

Engineering Characterization of Strong Ground Motion Recorded at Rock Sites  

Science Conference Proceedings (OSTI)

The objective of this project is to define the engineering characteristics of strong ground motion recorded at rock sites. Particular emphasis is placed upon resolving the factors that control the shape of response spectra in both WNA (western North America) and ENA (central and eastern North America) tectonic environments. To accomplish this objective, a simple band-limited white noise (BLWN) ground motion model employing a constant-stress-drop, single-corner-frequency, omega-square source combined with...

1995-08-17T23:59:59.000Z

211

Ground potential rise monitor  

SciTech Connect

A device and method for detecting ground potential rise (GPR) comprising positioning a first electrode and a second electrode at a distance from each other into the earth. The voltage of the first electrode and second electrode is attenuated by an attenuation factor creating an attenuated voltage. The true RMS voltage of the attenuated voltage is determined creating an attenuated true RMS voltage. The attenuated true RMS voltage is then multiplied by the attenuation factor creating a calculated true RMS voltage. If the calculated true RMS voltage is greater than a first predetermined voltage threshold, a first alarm is enabled at a local location. If user input is received at a remote location acknowledging the first alarm, a first alarm acknowledgment signal is transmitted. The first alarm acknowledgment signal is then received at which time the first alarm is disabled.

Allen, Zachery W. (Mandan, ND); Zevenbergen, Gary A. (Arvada, CO)

2012-04-03T23:59:59.000Z

212

On-line parameter estimation of PMSM in open loop and closed loop  

Science Conference Proceedings (OSTI)

The paper discusses the multi-models approach for on-line parameter estimation of permanent magnet synchronous motor (PMSM). The study is focused on a PMSM with non sinusoidal electromotive force (emf) in open loop and closed loop conditions. The electrical ...

Makara Khov; Jeremi Regnier; Jean Faucher

2009-02-01T23:59:59.000Z

213

Parameterizing loop fusion for automated empirical tuning  

SciTech Connect

Traditional compilers are limited in their ability to optimize applications for different architectures because statically modeling the effect of specific optimizations on different hardware implementations is difficult. Recent research has been addressing this issue through the use of empirical tuning, which uses trial executions to determine the optimization parameters that are most effective on a particular hardware platform. In this paper, we investigate empirical tuning of loop fusion, an important transformation for optimizing a significant class of real-world applications. In spite of its usefulness, fusion has attracted little attention from previous empirical tuning research, partially because it is much harder to configure than transformations like loop blocking and unrolling. This paper presents novel compiler techniques that extend conventional fusion algorithms to parameterize their output when optimizing a computation, thus allowing the compiler to formulate the entire configuration space for loop fusion using a sequence of integer parameters. The compiler can then employ an external empirical search engine to find the optimal operating point within the space of legal fusion configurations and generate the final optimized code using a simple code transformation system. We have implemented our approach within our compiler infrastructure and conducted preliminary experiments using a simple empirical search strategy. Our results convey new insights on the interaction of loop fusion with limited hardware resources, such as available registers, while confirming conventional wisdom about the effectiveness of loop fusion in improving application performance.

Zhao, Y; Yi, Q; Kennedy, K; Quinlan, D; Vuduc, R

2005-12-15T23:59:59.000Z

214

Facility HVAC System Conversion to Ground Source Heat Pump Geothermal...  

Open Energy Info (EERE)

ventilators will utilize the hot water to "temper" outdoor air ventilation. Although the heat pump modules can provide both heating and cooling, the space requires heating only....

215

Enhancement of heat transfer for ground source heat pump systems.  

E-Print Network (OSTI)

??Uptake of geothermal heat pump (GSHP) systems has been slow in some parts of the world due to the unpredictable operational performance, large installation space… (more)

Mori, Hiromi

2010-01-01T23:59:59.000Z

216

SIMULATION AND OPTIMAL CONTROL OF HYBRID GROUND SOURCE HEAT  

E-Print Network (OSTI)

.7 Annual hourly building load for the office building in Tulsa, OK................ 240 Figure 6.8 Main Figure 7.1 Office building loads for El Paso, TX.16 System loads and heat pump power consumptions of office and motel #12;xx building in Tulsa, OK

217

North Village Ground Source Heat Pump Project Geothermal Project...  

Open Energy Info (EERE)

Higher education has appropriately become the seedbed of the burgeoning sustainability movement. Colleges and universities have a responsibility to model sustainable...

218

ADVANCES IN MODELING OF GROUND-SOURCE HEAT  

E-Print Network (OSTI)

] K. C. Toh, X. Y. Chen, and J. C. Chai, "Numerical computation of fluid flow and heat transfer journal and conference papers. His current research interests include heat transfer and fluid-flow to substantially increase the heat transfer coefficient when a fluid is passing through microchannels. Heat sinks

219

Education and Collection Facility (ECF) Ground Source Heat Pump...  

Open Energy Info (EERE)

and Collection Facility (ECF) addition. In 2007, Denver voters passed a 30 million dollar bond initiative that will cover approximately 57% of the cost of the ECF. A fraction...

220

Ground Water Management Regulations (Louisiana) | Department...  

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

Ground Water Management Regulations (Louisiana) Ground Water Management Regulations (Louisiana) Eligibility Agricultural Construction Developer Fuel Distributor Industrial...

Note: This page contains sample records for the topic "loop ground source" 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

COMPARATIVE STUDY AMONG HYBRID GROUND SOURCE HEAT PUMP SYSTEM, COMPLETE GROUND SOURCE HEAT PUMP AND CONVENTIONAL HVAC SYSTEM  

DOE Green Energy (OSTI)

In this paper, a hotel with hybrid geothermal heat pump system (HyGSHP) in the Pensacola is selected and simulated by the transient simulation software package TRNSYS [1]. To verify the simulation results, the validations are conducted by using the monthly average entering water temperature, monthly facility consumption data, and etc. And three types of HVAC systems are compared based on the same building model and HVAC system capacity. The results are presented to show the advantages and disadvantages of HyGSHP compared with the other two systems in terms of energy consumptions, life cycle cost analysis.

Jiang Zhu; Yong X. Tao

2011-11-01T23:59:59.000Z

222

Coal mine ground control. 3rd ed.  

Science Conference Proceedings (OSTI)

The third edition not only completely revises and updates the original subject areas, but also is broadened to include a number of new topics such as high horizontal stresses, computer modeling, and highwall stability. The subject areas covered in this book define the current field of coal mine ground control, except for the recently emerging topic of mine seals and some conventional subjects such as coal/rock cutting and impoundment dams. It contains 1,134 references from all published sources, and archived since 1876.

Peng, S.S.

2008-09-15T23:59:59.000Z

223

Selective purge for hydrogenation reactor recycle loop  

SciTech Connect

Processes and apparatus for providing improved contaminant removal and hydrogen recovery in hydrogenation reactors, particularly in refineries and petrochemical plants. The improved contaminant removal is achieved by selective purging, by passing gases in the hydrogenation reactor recycle loop or purge stream across membranes selective in favor of the contaminant over hydrogen.

Baker, Richard W. (Palo Alto, CA); Lokhandwala, Kaaeid A. (Union City, CA)

2001-01-01T23:59:59.000Z

224

Loop expansion in Yang-Mills thermodynamics  

E-Print Network (OSTI)

We argue that a selfconsistent spatial coarse-graining, which involves interacting (anti)calorons of unit topological charge modulus, implies that real-time loop expansions of thermodynamical quantities in the deconfining phase of SU(2) and SU(3) Yang-Mills thermodynamics are, modulo 1PI resummations, determined by a finite number of connected bubble diagrams.

Ralf Hofmann

2006-09-05T23:59:59.000Z

225

Free Steiner Loops Smile Markovski, Ana Sokolova  

E-Print Network (OSTI)

Free Steiner Loops Smile Markovski, Ana Sokolova Faculty of Sciences and Mathematics, Institute and finite sloops. Two constructions of free objects in the variety of sloops are pre­ sented in this paper. They both allow recursive construction of a free sloop with a free base X, provided that X is recursively

Sokolova, Ana

226

Loop realizations of quantum affine algebras  

Science Conference Proceedings (OSTI)

We give a simplified description of quantum affine algebras in their loop presentation. This description is related to Drinfeld's new realization via halves of vertex operators. We also define an idempotent version of the quantum affine algebra which is suitable for categorification.

Cautis, Sabin [Department of Mathematics, University of Southern California, Los Angeles, California, 90089 (United States); Licata, Anthony [Department of Mathematics, Australian National University, Canberra (Australia)

2012-12-15T23:59:59.000Z

227

Research issues on closed-loop PLM  

Science Conference Proceedings (OSTI)

This study introduces the research issues on closed-loop product lifecycle management (PLM) where product information flow is closed due to emerging technologies. PLM is a new strategic approach to manage the product lifecycle information efficiently ... Keywords: PLM, Product identification technologies, Product lifecycle, Research issues

Hong-Bae Jun; Dimitris Kiritsis; Paul Xirouchakis

2007-12-01T23:59:59.000Z

228

ISG8-RF Sources  

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

RF Sources - (WG3) RF Sources - (WG3) Orange Rm Yong Ho Chin, Christopher Nantista, and Sami G. Tantawi Parallel Sessions: Working Groups: WG1: Parameters, Design, Instrumentation and Tuning WG2: Damping Rings and ATF WG3: RF Sources WG4:Structures WG5: Ground Motion; Site Requirements and Investigations Monday Morning 9:00-10:30 Plenary Coffee Break 11:00-12:00 Planning Session. Monday Afternoon 13:30-15:30 High Gradient Issues (Joint with working group 4) Coffee Break 16:00-16:30 The 8-Pack Project -- D. Atkinson 16:30-17:30 High Gradient Issues and Discussions Continued. Tuesday Morning 9:30-10:30 Klystrons 9:30-10:00 Status of PPM Klystron Development for JLC -- Y. H. Chin 10:00-10:30 Design of 150MW Multi-Beam Klystron -- S. Matsumoto Coffee Break 11:00-11:30 Klystron Development at SLAC -- G. Caryotakis

229

Ground Motion Model of the SLAC Site ?  

E-Print Network (OSTI)

motion p(?, L) can be written as p(?, L) = p(?)2(1 ? c(?, L)) which in turn can be transformed into P(?, k) [9]. We present a ground motion model for the SLAC site. This Measurements [2, 6] show that the fast motion in a rea-model is based on recent ground motion studies performed sonably quiet site consists primarily of elastic waves prop-at SLAC as well as on historical data. The model includes agating with a high velocity v (of the order of km/s). wave-like, diffusive and systematic types of motion. An The correlation is then completely defined by this velocity attempt is made to relate measurable secondary properties (which may be a function of frequency) and by the distri-of the ground motion with more basic characteristics such bution of the noise sources. In the case where the waves as the layered geological structure of the surrounding earth, propagate on the surface and are distributed uniformly in depth of the tunnel, etc. This model is an essential step in azimuthal angle, the correlation is given by c(?, L) = evaluating sites for a future linear collider. ?cos(?L/v cos(?))?? = J0(?L/v) and the corresponding 2-D spectrum of the ground motion is P(?, k) = 2p(?) / ? (?/v(f)) 2 ? k2, |k | ? ?/v(f). The absolute power spectrum of the fast motion, assumed for the SLAC model, corresponds to measurements performed at 2 AM in one of the quietest locations at SLAC, sector 10 of the linac [2], (see Fig.1). The spatial properties are defined by the phase velocity found from correlation measurements v(f) = 450 + 1900 exp(?f/2) (with v in m/s, f in Hz) [2]. 1

Andrei Seryi; Tor Raubenheimer

2000-01-01T23:59:59.000Z

230

Ground Magnetics At Coso Geothermal Area (1984) | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Ground Magnetics At Coso Geothermal Area (1984) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Ground Magnetics At Coso Geothermal Area (1984) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Ground Magnetics Activity Date 1984 Usefulness useful DOE-funding Unknown Notes The magnetic intensity contours match general geologic patterns in varying rock types. Hydrothermally altered rocks along intersecting fault zones show up as strong magnetic lows that form a triangular-shaped area. This area is centered in an area of highest heat flow and is a site of

231

Loop simulation capability for sodium-cooled systems  

E-Print Network (OSTI)

A one-dimensional loop simulation capability has been implemented in the thermal-hydraulic analysis code, THERMIT-4E. This code had been used to simulate and investigate flow in test sections of experimental sodium loops ...

Adekugbe, Oluwole A.

1984-01-01T23:59:59.000Z

232

Better 'Photon Loops' May Be Key to Computer and Physics ...  

Science Conference Proceedings (OSTI)

Better 'Photon Loops' May Be Key to Computer and Physics Advances. From NIST Tech Beat: August 22, 2011. ...

2012-08-23T23:59:59.000Z

233

HIGH VOLTAGE ION SOURCE  

DOE Patents (OSTI)

A device is described for providing a source of molecular ions having a large output current and with an accelerated energy of the order of 600 kv. Ions are produced in an ion source which is provided with a water-cooled source grid of metal to effect maximum recombination of atomic ions to molecular ions. A very high accelerating voltage is applied to withdraw and accelerate the molecular ions from the source, and means are provided for dumping the excess electrons at the lowest possible potentials. An accelerating grid is placed adjacent to the source grid and a slotted, grounded accelerating electrode is placed adjacent to the accelerating grid. A potential of about 35 kv is maintained between the source grid and accelerating grid, and a potential of about 600 kv is maintained between the accelerating grid and accelerating electrode. In order to keep at a minimum the large number of oscillating electrons which are created when such high voltages are employed in the vicinity of a strong magnetic field, a plurality of high voltage cascaded shields are employed with a conventional electron dumping system being employed between each shield so as to dump the electrons at the lowest possible potential rather than at 600 kv.

Luce, J.S.

1960-04-19T23:59:59.000Z

234

Ground-to-Air Gas Emission Rate Inferred from Measured Concentration Rise within a Disturbed Atmospheric Surface Layer  

Science Conference Proceedings (OSTI)

In reference to previously observed concentrations of methane released from a source enclosed by a windbreak, this paper examines a refined “inverse dispersion” approach for estimating the rate of emission Q from a small ground-level source, when ...

J. D. Wilson; T. K. Flesch; P. Bourdin

2010-09-01T23:59:59.000Z

235

A Load Balancing Tool for Distributed Parallel Loops  

Science Conference Proceedings (OSTI)

Large scale applications typically contain parallel loops with many iterates. The iterates of a parallel loop may have variable execution times which translate into performance degradation of an application due to load imbalance. This paper describes ... Keywords: adaptive loop scheduling, dynamic load balancing

Ricolindo L. Carińo; Ioana Banicescu

2005-10-01T23:59:59.000Z

236

Alternative Materials for Ground Electrodes  

Science Conference Proceedings (OSTI)

Power utility companies struggle with issues resulting from copper theftespecially on transmission line support structures accessible to the public and fitted with copper grounding conductors. It is increasingly important to identify alternative materials that can be used to provide a durable grounding system yet not be targeted for theft. In response, EPRI is investigating the use of alternative materials for electrode designsexamining life expectancy, corrosion, material compatibility and current handl...

2010-12-23T23:59:59.000Z

237

A cost-effective, environmentally-responsive ground-water monitoring procedure  

E-Print Network (OSTI)

Ground-water monitoring is the primary method used to protect our ground-water resources. The primary objectives of monitoring programs are to detect, to attribute, and to mitigate any changes in-water quality or quantity. Previous monitoring programs have had numerous problems including the failure to produce usable information and the failure to balance the competing factors of cost-effectiveness and environmental protection. A cost-effective, environmentally-responsive ground-water procedure was designed which consists of eight steps and two feedback loops. The reason for monitoring must first be determined before clear monitoring goals can be set. Characterization of the site allows proper design of the monitoring network. Data is then collected and analyzed creating usable information. Applying this new information to the information expansion loop permits a better understanding of the initial site characterization. Finally evaluating the entire routine to determine the effectiveness of the program allows the optimization loop to modify the system for greater efficiency. The value of this procedure was tested at selected sites in the Gibbons Creek Lignite Mine in Grimes County, Texas. The mine, which is currently in compliance with state regulations, is not operating an efficient monitoring program. The problems included over-monitoring of metals in and around reclaimed mine blocks, over-monitoring by monitoring wells in the same aquifer, and the failure to attribute changes in a monitoring well near a dewatering well. The feedback loops helped to optimize the entire program by recognizing problems in the stratigraphic column and modifying the monitoring program to lower monitoring costs. Three major benefits are gained by using this procedure: the ground-water monitoring routine can be made more cost-effective, environmental protection will be increased, and environmental liability will be decreased.

Doucette, Richard Charles

1994-01-01T23:59:59.000Z

238

Sources - CECM  

E-Print Network (OSTI)

help · annotate · Contents Next: References Up: RamanujanModular Equations, Previous: Ramanujan's sum. Sources. [Annotate] · [Shownotes]. References [7] ...

239

Highly Efficient Modeling of Dynamic Coronal Loops  

E-Print Network (OSTI)

Observational and theoretical evidence suggests that coronal heating is impulsive and occurs on very small cross-field spatial scales. A single coronal loop could contain a hundred or more individual strands that are heated quasi-independently by nanoflares. It is therefore an enormous undertaking to model an entire active region or the global corona. Three-dimensional MHD codes have inadequate spatial resolution, and 1D hydro codes are too slow to simulate the many thousands of elemental strands that must be treated in a reasonable representation. Fortunately, thermal conduction and flows tend to smooth out plasma gradients along the magnetic field, so "0D models" are an acceptable alternative. We have developed a highly efficient model called Enthalpy-Based Thermal Evolution of Loops (EBTEL) that accurately describes the evolution of the average temperature, pressure, and density along a coronal strand. It improves significantly upon earlier models of this type--in accuracy, flexibility, and capability. It ...

Klimchuk, J A; Cargill, P J

2007-01-01T23:59:59.000Z

240

EXAMINATION OF HIGH PRESSURE RECOMBINER LOOP SPECIMENS  

DOE Green Energy (OSTI)

Speciments of iodide zirconium, Zircaloy-2, Zr-15Nb, iodide titanium, TMCA-45 titanium, A-110AT titanium, and 430 stainless steel were corroded in a highpressure recombiner loop. Analyses were performed to determine the amount of hydrogen pickup. The titanium materials and iodide zirconium showed very high hydrogen pickups, while the zirconium alloys and the 430 stainless steel absorbed smaller amounts of hydrogen Metallographic examination of the specimens showed that recrystallization occurred in all but the Ar-15Nb specimens. There seems to be little difference in the extent of recrystallization and grain growth whether the in the recombiner section at 430 to 500 deg C. Recrystalliplained or correlated in any way with the amount of f hydrogen sion that occured. Since hydrogen is known to seriously embrittle zirconium and titanium, it is recommended that crystal-bar zirconium and titanium alloys not be used as materials of construction in environ ments sinmilar to that of the High Pressure Recombiner Loop. (auth)

Picklesimer, M.L.; Rittenhouse, P.L.

1958-08-14T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Projective Structures in Loop Quantum Cosmology  

E-Print Network (OSTI)

Projective structures have successfully been used for the construction of measures in the framework of loop quantum gravity. In the present paper we establish such a structure for the space $R \\sqcup R_Bohr$ recently constructed in the context of homogeneous isotropic loop quantum cosmology. This space has the advantage to be canonically embedded into the quantum configuration space of the full theory, but, in contrast to the traditional space $R_Bohr$, there exists no Haar measure on $R \\sqcup R_Bohr$. The introduced projective structure, however, allows to construct a family of canonical measures on $R \\sqcup R_Bohr$ whose corresponding Hilbert spaces of square integrable functions we finally investigate.

Maximilian Hanusch

2013-09-03T23:59:59.000Z

242

Flipped spinfoam vertex and loop gravity  

E-Print Network (OSTI)

We introduce a vertex amplitude for 4d loop quantum gravity. We derive it from a conventional quantization of a Regge discretization of euclidean general relativity. This yields a spinfoam sum that corrects some difficulties of the Barrett-Crane theory. The second class simplicity constraints are imposed weakly, and not strongly as in Barrett-Crane theory. Thanks to a flip in the quantum algebra, the boundary states turn out to match those of SO(3) loop quantum gravity -- the two can be identified as eigenstates of the same physical quantities -- providing a solution to the problem of connecting the covariant SO(4) spinfoam formalism with the canonical SO(3) spin-network one. The vertex amplitude is SO(3) and SO(4)-covariant. It rectifies the triviality of the intertwiner dependence of the Barrett-Crane vertex, which is responsible for its failure to yield the correct propagator tensorial structure. The construction provides also an independent derivation of the kinematics of loop quantum gravity and of the result that geometry is quantized.

Jonathan Engle; Roberto Pereira; Carlo Rovelli

2007-08-09T23:59:59.000Z

243

Lorentz covariance of loop quantum gravity  

SciTech Connect

The kinematics of loop gravity can be given a manifestly Lorentz-covariant formulation: the conventional SU(2)-spin-network Hilbert space can be mapped to a space K of SL(2,C) functions, where Lorentz covariance is manifest. K can be described in terms of a certain subset of the projected spin networks studied by Livine, Alexandrov and Dupuis. It is formed by SL(2,C) functions completely determined by their restriction on SU(2). These are square-integrable in the SU(2) scalar product, but not in the SL(2,C) one. Thus, SU(2)-spin-network states can be represented by Lorentz-covariant SL(2,C) functions, as two-component photons can be described in the Lorentz-covariant Gupta-Bleuler formalism. As shown by Wolfgang Wieland in a related paper, this manifestly Lorentz-covariant formulation can also be directly obtained from canonical quantization. We show that the spinfoam dynamics of loop quantum gravity is locally SL(2,C)-invariant in the bulk, and yields states that are precisely in K on the boundary. This clarifies how the SL(2,C) spinfoam formalism yields an SU(2) theory on the boundary. These structures define a tidy Lorentz-covariant formalism for loop gravity.

Rovelli, Carlo; Speziale, Simone [Centre de Physique Theorique de Luminy, Case 907, F-13288 Marseille (France)

2011-05-15T23:59:59.000Z

244

MAGNETIC LOOPS IN THE QUIET SUN  

Science Conference Proceedings (OSTI)

We investigate the fine structure of magnetic fields in the atmosphere of the quiet Sun. We use photospheric magnetic field measurements from SUNRISE/IMaX with unprecedented spatial resolution to extrapolate the photospheric magnetic field into higher layers of the solar atmosphere with the help of potential and force-free extrapolation techniques. We find that most magnetic loops that reach into the chromosphere or higher have one footpoint in relatively strong magnetic field regions in the photosphere. Ninety-one percent of the magnetic energy in the mid-chromosphere (at a height of 1 Mm) is in field lines, whose stronger footpoint has a strength of more than 300 G, i.e., above the equipartition field strength with convection. The loops reaching into the chromosphere and corona are also found to be asymmetric in the sense that the weaker footpoint has a strength B < 300 G and is located in the internetwork (IN). Such loops are expected to be strongly dynamic and have short lifetimes, as dictated by the properties of the IN fields.

Wiegelmann, T.; Solanki, S. K.; Barthol, P.; Gandorfer, A. [Max-Planck-Institut fuer Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau (Germany); Borrero, J. M.; Schmidt, W. [Kiepenheuer-Institut fuer Sonnenphysik, Schoeneckstr. 6, 79104 Freiburg (Germany); Pillet, V. MartInez; Bonet, J. A. [Instituto de Astrofisica de Canarias, C/Via Lactea s/n, 38200 La Laguna, Tenerife (Spain); Del Toro Iniesta, J. C. [Instituto de Astrofisica de Andalucia (CSIC), Apartado de Correos 3004, 18080 Granada (Spain); Domingo, V. [Grupo de Astronomia y Ciencias del Espacio, Universidad de Valencia, 46980 Paterna, Valencia (Spain); Knoelker, M. [High Altitude Observatory, National Center for Atmospheric Research Boulder, CO 80307 (United States); Title, A. M., E-mail: wiegelmann@mps.mpg.d [Lockheed Martin Solar and Astrophysics Laboratory, Bldg. 252, 3251 Hanover Street, Palo Alto, CA 94304 (United States)

2010-11-10T23:59:59.000Z

245

Program on Technology Innovation: Modeling of Single-Well Closed-Loop Enhanced Geothermal Systems  

Science Conference Proceedings (OSTI)

Conventional enhanced geothermal systems (EGSs) include one production well and one injection well to use hydrothermal resources to generate electricity. However, the high initial cost of drilling EGS wells is one of the main factors that hurt its competitiveness with other energy sources. The single-well closed-loop EGS (SWCLEGS) is a new type of geothermal power generation technology that aims to eliminate the need for natural hydrothermal resources with a relatively low drilling cost. The objective of...

2012-02-28T23:59:59.000Z

246

NETL F 451.1/1-1, Categorical Exclusion Designation Form  

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

closed loop geothermal system to retrofit existing HVAC system with closed loop ground source heat pump at the Tolland Town Hall. Teresa Jones Digitally signed by Teresa Jones...

247

On active region loops: Hinode/EIS observations  

E-Print Network (OSTI)

Coronal loops are fundamental building blocks of the solar active regions and the corona. Therefore, a clear understanding of the physics of coronal loops will help us understand the physics of active region heating in particular and coronal heating in general. This requires a precise measurement of physical quantities such as electron densities and filling factors, temperatures, and flows in coronal loops. In this paper we have carried out an investigation of a spatially well resolved coronal loop using the EIS onboard Hinode to measure the above mentioned physical quantities. Based on this study we find that a nano-flare model could explain most of the observed characteristics of this loop.

Tripathi, D; Dwivedi, B N; Del Zanna, G; Young, P R

2009-01-01T23:59:59.000Z

248

Bio-Polymer Hairpin Loops Sustained by Polarons  

E-Print Network (OSTI)

We show that polarons can sustain loop-like configurations in flexible bio-polymers and that the size of the loops depend on both the flexural rigidity of the polymer and the electron-phonon coupling constant. In particular we show that for single stranded DNA (ssDNA) such loops can have as little as 10 base pairs. For polyacetylene the shortest loop must have at least 12 nodes. We also show that these configurations are very stable under thermal fluctuations and can facilitate the formation of hairpin-loops of ssDNA.

B. Chakrabarti; B. Piette; W. J. Zakrzewski

2012-04-04T23:59:59.000Z

249

Bio-Polymer Hairpin Loops Sustained by Polarons  

E-Print Network (OSTI)

We show that polarons can sustain loop-like configurations in flexible bio-polymers and that the size of the loops depend on both the flexural rigidity of the polymer and the electron-phonon coupling constant. In particular we show that for single stranded DNA (ssDNA) such loops can have as little as 10 base pairs. For polyacetylene the shortest loop must have at least 12 nodes. We also show that these configurations are very stable under thermal fluctuations and can facilitate the formation of hairpin-loops of ssDNA.

Chakrabarti, B; Zakrzewski, W J

2012-01-01T23:59:59.000Z

250

Chemical Looping Air Separation Unit and Methods of Use  

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

Looping Air Separation Unit and Methods of Use Looping Air Separation Unit and Methods of Use Contact NETL Technology Transfer Group techtransfer@netl.doe.gov October 2012 Opportunity Research is currently active on the patent-pending technology "Chemical Looping Air Separation Unit and Methods of Use" that combines the best attributes of chemical looping and oxy-fuel combustion technologies. Following patent approval, the technology will be available for licensing and/or further collaborative research from the U.S. Department of Energy's National Energy Technology Laboratory. Significance * Combines chemical looping and oxy-fuel technologies * Separates oxygen from air at high efficiencies * Removes CO

251

Colorado Ground Water Commission | Open Energy Information  

Open Energy Info (EERE)

Water Commission Jump to: navigation, search Name Colorado Ground Water Commission Place Colorado Website http:water.state.co.usgroun References Colorado Ground Water Commission...

252

Transient analysis of grounding systems  

SciTech Connect

This paper addresses the problem of computing the ground potential rise of grounding systems during transients. Finite element analysis is employed to model the constituent parts of a grounding system. Short lengths of earth embedded electrodes are characterized as transmission lines with distributed inductance, capacitance and leakage resistance to earth. Leakage resistance to earth is accurately computed with the method of moments. The other parameters of the finite element, namely inductance and capacitance, are computed from the resistance utilizing Maxwell's equations. This modeling enables the computation of the transient response of substation grounding systems to fast or slow waves striking the substation. The result is obtained in terms of a convolution of the step response of the system and the striking wave. In this way the impedance of substation systems to 60 cycles is accurately computed. Results demonstrate the dependence of the 60 cycle impedance on system parameters. The methodology allows to interface this model of a substation ground mat with the Electromagnetic Transient Analysis Program thus, allowing explicit representation of earth effects in electromagmatic transients computations.

Meliopoulos, A.P.; Moharam, M.G.

1983-02-01T23:59:59.000Z

253

Energy Sources | Department of Energy  

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

Energy Sources Energy Sources Energy Sources December 12, 2013 AEMC Summit Slideshow: Innovation in the Manufacturing Sector Learn how advanced technologies are helping manufacturers reduce waste, increase productivity and become leaders in the clean energy economy. October 16, 2013 West Penn Power SEF Commercial Loan Program The West Penn Power Sustainable Energy Fund (WPPSEF) promotes the use of renewable energy and clean energy among commercial, industrial, institutional and residential customers in the West Penn market region. Eligible technologies include solar, wind, low-impact hydro, and sustainable biomass such as closed-loop biomass and biomass gasification, as well as energy efficiency. October 16, 2013 UES - Renewable Energy Credit Purchase Program '''''Note: The Arizona Corporation Commission (ACC) is in the process of

254

Ground Magnetics | Open Energy Information  

Open Energy Info (EERE)

Ground Magnetics Ground Magnetics Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Ground Magnetics Details Activities (15) Areas (12) Regions (0) NEPA(1) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Magnetic Techniques Parent Exploration Technique: Magnetic Techniques Information Provided by Technique Lithology: Presence of magnetic minerals such as magnetite. Stratigraphic/Structural: Mapping of basement structures, horst blocks, fault systems, fracture zones, dykes and intrusions. Hydrological: The circulation of hydrothermal fluid may impact the magnetic susceptibility of rocks. Thermal: Rocks lose their magnetic properties at the Curie temperature (580° C for magnetite) [1] and, upon cooling, remagnetize in the present magnetic field orientation. The Curie point depth in the subsurface may be determined in a magnetic survey to provide information about hydrothermal activity in a region.

255

Improving Water Loop Heat Pump Performance by Using Low Temperature Geothermal Fluid  

DOE Green Energy (OSTI)

Water-loop heat pump (WLHP) systems are an important option for space conditioning of commercial buildings. They provide the opportunity of saving energy through heat recovery and thermal balancing when heating and cooling occur simultaneously. WLHP systems typically operate with loop water temperature between 16 C and 32 C. When cooling loads dominate, loop water temperatures are maintained below 32 C by rejecting excess heat with a cooling tower. When heating dominates, loop water temperatures are maintained above 16 C by a heater input. The capacity and efficiency of water-source heat pumps (WSHP) in both operating modes are strong functions of the inlet water temperature. The emphasis of this paper is on the analysis of system performances, energy savings of the mixed cooling and heating mode of the WLHP systems for it is a unique operating mode in the air-conditioning and space heating systems. The energy saving effect by using low temperature geothermal as the heat input for WLHP systems was examined.

Xinguo, Li

1995-01-01T23:59:59.000Z

256

Gravitational Waves from Light Cosmic Strings: Backgrounds and Bursts with Large Loops  

E-Print Network (OSTI)

The mean spectrum and burst statistics of gravitational waves produced by a cosmological population of cosmic string loops are estimated using analytic approximations, calibrated with earlier simulations. Formulas are derived showing the dependence of observables on the string tension, in the regime where newly-formed loops are relatively large, not very much smaller than the horizon. Large loops form earlier, are more abundant, and generate a more intense stochastic background and more frequent bursts than assumed in earlier background estimates, enabling experiments to probe lighter cosmic strings of interest to string theory. Predictions are compared with instrument noise from current and future experiments, and with confusion noise from known astrophysical gravitational wave sources such as stellar and massive black hole binaries. In these large-loop models, current data from millisecond pulsar timing already suggests that the tension is less than about $10^{-10}$, a typical value expected in strings from brane inflation. LISA will be sensitive to stochastic backgrounds created by strings as light as $G\\mu\\approx 10^{-15}$, at frequencies where it is limited by confusion noise of Galactic stellar populations; however, for those lightest detectable strings, bursts are rarely detectable.

Craig J. Hogan

2006-05-22T23:59:59.000Z

257

Ion source  

DOE Patents (OSTI)

A magnetic filter for an ion source reduces the production of undesired ion species and improves the ion beam quality. High-energy ionizing electrons are confined by the magnetic filter to an ion source region, where the high-energy electrons ionize gas molecules. One embodiment of the magnetic filter uses permanent magnets oriented to establish a magnetic field transverse to the direction of travel of ions from the ion source region to the ion extraction region. In another embodiment, low energy 16 eV electrons are injected into the ion source to dissociate gas molecules and undesired ion species into desired ion species.

Leung, Ka-Ngo (Hercules, CA); Ehlers, Kenneth W. (Alamo, CA)

1984-01-01T23:59:59.000Z

258

Ground Truth: A Positive Cloud-to-Ground Lightning Flash  

Science Conference Proceedings (OSTI)

We describe the circumstances and effects of a cloud-to-ground lightning flash that lowered positive charge and struck a residential home near Albany, New York. The characteristics of the flash were detected and recorded by a wide-band magnetic ...

Vincent P. Idone; Richard E. Orville; Ronald W. Henderson

1984-07-01T23:59:59.000Z

259

Ground states in complex bodies  

E-Print Network (OSTI)

A unified framework for analyzing the existence of ground states in wide classes of elastic complex bodies is presented here. The approach makes use of classical semicontinuity results, Sobolev mappinngs and Cartesian currents. Weak diffeomorphisms are used to represent macroscopic deformations. Sobolev maps and Cartesian currents describe the inner substructure of the material elements. Balance equations for irregular minimizers are derived. A contribution to the debate about the role of the balance of configurational actions follows. After describing a list of possible applications of the general results collected here, a concrete discussion of the existence of ground states in thermodynamically stable quasicrystals is presented at the end.

Paolo Maria Mariano; Giuseppe Modica

2008-02-11T23:59:59.000Z

260

LINE-ABOVE-GROUND ATTENUATOR  

DOE Patents (OSTI)

The line-above-ground attenuator provides a continuously variable microwave attenuator for a coaxial line that is capable of high attenuation and low insertion loss. The device consists of a short section of the line-above- ground plane type transmission lime, a pair of identical rectangular slabs of lossy material like polytron, whose longitudinal axes are parallel to and indentically spaced away from either side of the line, and a geared mechanism to adjust amd maintain this spaced relationship. This device permits optimum fineness and accuracy of attenuator control which heretofore has been difficult to achieve.

Wilds, R.B.; Ames, J.R.

1957-09-24T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Gas Test Loop Booster Fuel Hydraulic Testing  

SciTech Connect

The Gas Test Loop (GTL) project is for the design of an adaptation to the Advanced Test Reactor (ATR) to create a fast-flux test space where fuels and materials for advanced reactor concepts can undergo irradiation testing. Incident to that design, it was found necessary to make use of special booster fuel to enhance the neutron flux in the reactor lobe in which the Gas Test Loop will be installed. Because the booster fuel is of a different composition and configuration from standard ATR fuel, it is necessary to qualify the booster fuel for use in the ATR. Part of that qualification is the determination that required thermal hydraulic criteria will be met under routine operation and under selected accident scenarios. The Hydraulic Testing task in the GTL project facilitates that determination by measuring flow coefficients (pressure drops) over various regions of the booster fuel over a range of primary coolant flow rates. A high-fidelity model of the NW lobe of the ATR with associated flow baffle, in-pile-tube, and below-core flow channels was designed, constructed and located in the Idaho State University Thermal Fluids Laboratory. A circulation loop was designed and constructed by the university to provide reactor-relevant water flow rates to the test system. Models of the four booster fuel elements required for GTL operation were fabricated from aluminum (no uranium or means of heating) and placed in the flow channel. One of these was instrumented with Pitot tubes to measure flow velocities in the channels between the three booster fuel plates and between the innermost and outermost plates and the side walls of the flow annulus. Flow coefficients in the range of 4 to 6.5 were determined from the measurements made for the upper and middle parts of the booster fuel elements. The flow coefficient for the lower end of the booster fuel and the sub-core flow channel was lower at 2.3.

Gas Test Loop Hydraulic Testing Staff

2006-09-01T23:59:59.000Z

262

DARPA Learning Applied to Ground Robots (LAGR)  

Science Conference Proceedings (OSTI)

DARPA Learning Applied to Ground Robots (LAGR) Project (Concluded). Summary: The National Institute of Standards ...

2012-01-04T23:59:59.000Z

263

High-Resolution Design of a Protein Loop  

DOE Green Energy (OSTI)

Despite having irregular structure, protein loops often adopt specific conformations that are critical to protein function. Most studies in de novo protein design have focused on creating proteins with regular elements of secondary structure connected by very short loops or turns. To design longer protein loops that adopt specific conformations, we have developed a protocol within the Rosetta molecular modeling program that iterates between optimizing the sequence and conformation of a loop in search of low-energy sequence-structure pairs. We have tested the procedure by designing 10-residue loops for the connection between the second and third strand in the {beta}-sandwich protein tenascin. Three low-energy designs from 7,200 flexible backbone trajectories were selected for experimental characterization. All three designs, called LoopA, LoopB, and LoopC, adopt stable folded structures. High-resolution crystal structures of LoopA and LoopB have been solved. LoopB adopts a structure very similar to the design model (0.46 Angstroms rmsd), and all but one of the side chains are modeled in the correct rotamers. LoopA crystallized at low pH in a structure that differs dramatically from our design model. It forms a strand-swapped dimer mediated by hydrogen bonds to protonated glutamic acids. Gel filtration indicates that the protein is not a dimer at neutral pH. These results suggest that the high-resolution design of protein loops is possible; however, they also highlight how small changes in protein energetics can dramatically perturb the low free energy structure of a protein.

Hu,X.; Wang, H.; Ke, H.; Kuhlman, B.

2007-01-01T23:59:59.000Z

264

CX-001346: Categorical Exclusion Determination | Department of...  

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

retrofits limited to insulation, lighting, heating, ventilation, air conditioning, weather sealing, appliances, high efficiency showersfaucets, closed loop ground source...

265

Max Tech and Beyond: Maximizing Appliance and Equipment Efficiency by Design  

E-Print Network (OSTI)

Report: Commercial Ground-Source Heat Pumps—One-Pipe Loops.6]. Commercial ground-source heat pumps are an establishedcost- effectiveness of ground-source heat pumps is generally

Desroches, Louis-Benoit

2012-01-01T23:59:59.000Z

266

Summary Report: Control Strategies for Mixed-Mode Buildings  

E-Print Network (OSTI)

night cooling and ground source heat pumps feeding a slabHVAC GSHP Ground source heat pump. Hydronic geothermal loop.System summary Ground Source Heat Pump; radiant slab heating

Brager, Gail; Borgeson, Sam; Lee, Yoonsu

2007-01-01T23:59:59.000Z

267

ISG8-Ground Motion; Site Requirements and Investigations  

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

Ground Motion; Site Requirements and Investigations (WG5) Ground Motion; Site Requirements and Investigations (WG5) June 24 - 27, 2002 Bldg.281 Conventional Facilities Rm. (A. Seryi, T. Tauchi) Parallel Sessions: Working Groups: WG1: Parameters, Design, Instrumentation and Tuning WG2: Damping Rings and ATF WG3: RF Sources WG4:Structures WG5: Ground Motion; Site Requirements and Investigations Agenda, ISG8 WG5 Final Version Goal: The main goal is to try to establish requirements to a linear collider site and determine a set of criteria that would allow evaluating a particular site. Trip to California representative sites: Scheduled and happened on Friday, departure 6am. This was a full day event. (Fred Asiri and Jerry Aarons were the guides). Monday, June 24, 11:00-12:00 Initial discussion Monday (joint with WG1) 13:30-17:30, Bldg.212, Cascades room

268

GNSS dataless signal tracking with a delay semi-open loop and a phase open loop  

Science Conference Proceedings (OSTI)

In this article we propose to process the code and phase delay of a dataless GNSS signal in open and semi-open loops. The aims of this processing are to get an accurate estimate of the phase and code delays by integration of the GNSS signal. We show ... Keywords: Bayesian estimation, Circular estimation, GNSS signal processing

G. Stienne; S. Reboul; M. Azmani; J. B. Choquel; M. Benjelloun

2013-05-01T23:59:59.000Z

269

Loop Current Cycle: Coupled Response of the Loop Current with Deep Flows  

Science Conference Proceedings (OSTI)

Although the upper-layer dynamics of the Loop Current and eddies in the Gulf of Mexico are well studied, the understanding of how they are coupled to the deep flows is limited. In this work, results from a numerical model are analyzed to classify ...

Y.-L. Chang; L.-Y. Oey

2011-03-01T23:59:59.000Z

270

Investigation of Ground-Fault Protection Devices for Photovoltaic Power Systems Applications  

Science Conference Proceedings (OSTI)

Photovoltaic (PV) power systems, like other electrical systems, may be subject to unexpected ground faults. Installed PV systems always have invisible elements other than those indicated by their electrical schematics. Stray inductance, capacitance and resistance are distributed throughout the system. Leakage currents associated with the PV modules, the interconnected array, wires, surge protection devices and conduit add up and can become large enough to look like a ground-fault. PV systems are frequently connected to other sources of power or energy storage such as batteries, standby generators, and the utility grid. This complex arrangement of distributed power and energy sources, distributed impedance and proximity to other sources of power requires sensing of ground faults and proper reaction by the ground-fault protection devices. The different dc grounding requirements (country to country) often add more confusion to the situation. This paper discusses the ground-fault issues associated with both the dc and ac side of PV systems and presents test results and operational impacts of backfeeding commercially available ac ground-fault protection devices under various modes of operation. Further, the measured effects of backfeeding the tripped ground-fault devices for periods of time comparable to anti-islanding allowances for utility interconnection of PV inverters in the United States are reported.

BOWER,WARD I.; WILES,JOHN

2000-10-03T23:59:59.000Z

271

An investigation of synthetic fuel production via chemical looping  

Science Conference Proceedings (OSTI)

Producing liquid hydrocarbon fuels with a reduced greenhouse gas emissions profile would ease the transition to a carbon-neutral energy sector with the transportation industry being the immediate beneficiary followed by the power industry. Revolutionary solutions in transportation, such as electricity and hydrogen, depend on the deployment of carbon capture and storage technologies and/or renewable energy systems. Additionally, high oil prices may increase the development of unconventional sources, such as tar sands, that have a higher emissions profile. One process that is gaining interest is a system for producing reduced carbon fuels though chemical looping technologies. An investigation of the implications of such a process using methane and carbon dioxide that is reformed to yield methanol has been done. An important aspect of the investigation is the use of off-the-shelf technologies to achieve the results. The ability of the process to yield reduced emissions fuels depends on the source for the feed and process heat. For the range of conditions considered, the emissions profile of methanol produced in this method varies from 0.475 to 1.645 moles carbon dioxide per mole methanol. The thermal load can be provided by methane, coal or carbon neutral (biogas). The upper bound can be lowered to 0.750 by applying CCS and/or using nonfossil heat sources for the reforming. The process provides an initial pathway to incorporate CO{sub 2} into fuels independent of electrolytic hydrogen or developments in other sectors of the economy. 22 refs., 1 fig., 3 tabs.

Frank Zeman; Marco Castaldi [Columbia University, New York, NY (United States). Department of Earth and Environmental Engineering

2008-04-15T23:59:59.000Z

272

Highly Efficient Modeling of Dynamic Coronal Loops  

E-Print Network (OSTI)

Observational and theoretical evidence suggests that coronal heating is impulsive and occurs on very small cross-field spatial scales. A single coronal loop could contain a hundred or more individual strands that are heated quasi-independently by nanoflares. It is therefore an enormous undertaking to model an entire active region or the global corona. Three-dimensional MHD codes have inadequate spatial resolution, and 1D hydro codes are too slow to simulate the many thousands of elemental strands that must be treated in a reasonable representation. Fortunately, thermal conduction and flows tend to smooth out plasma gradients along the magnetic field, so "0D models" are an acceptable alternative. We have developed a highly efficient model called Enthalpy-Based Thermal Evolution of Loops (EBTEL) that accurately describes the evolution of the average temperature, pressure, and density along a coronal strand. It improves significantly upon earlier models of this type--in accuracy, flexibility, and capability. It treats both slowly varying and highly impulsive coronal heating; it provides the differential emission measure distribution, DEM(T), at the transition region footpoints; and there are options for heat flux saturation and nonthermal electron beam heating. EBTEL gives excellent agreement with far more sophisticated 1D hydro simulations despite using four orders of magnitude less computing time. It promises to be a powerful new tool for solar and stellar studies.

J. A. Klimchuk; S. Patsourakos; P. J. Cargill

2007-10-01T23:59:59.000Z

273

Jordan cells of periodic loop models  

E-Print Network (OSTI)

Jordan cells in transfer matrices of finite lattice models are a signature of the logarithmic character of the conformal field theories that appear in their thermodynamical limit. The transfer matrix of periodic loop models, T_N, is an element of the periodic Temperley-Lieb algebra EPTL_N(\\beta, \\alpha), where N is the number of sites on a section of the cylinder, and \\beta = -(q+1/q) = 2 \\cos \\lambda and \\alpha the weights of contractible and non-contractible loops. The thermodynamic limit of T_N is believed to describe a conformal field theory of central charge c=1-6\\lambda^2/(\\pi(\\lambda-\\pi)). The abstract element T_N acts naturally on (a sum of) spaces V_N^d, similar to those upon which the standard modules of the (classical) Temperley-Lieb algebra act. These spaces known as sectors are labeled by the numbers of defects d and depend on a {\\em twist parameter} v that keeps track of the winding of defects around the cylinder. Criteria are given for non-trivial Jordan cells of T_N both between sectors with distinct defect numbers and within a given sector.

Alexi Morin-Duchesne; Yvan Saint-Aubin

2013-02-22T23:59:59.000Z

274

Wilson loops in warped resolved deformed conifolds  

Science Conference Proceedings (OSTI)

We calculate quark-antiquark potentials using the relationship between the expectation value of the Wilson loop and the action of a probe string in the string dual. We review and categorise the possible forms of the dependence of the energy on the separation between the quarks. In particular, we examine the possibility of there being a minimum separation for probe strings which do not penetrate close to the origin of the bulk space, and derive a condition which determines whether this is the case. We then apply these considerations to the flavoured resolved deformed conifold background of Gaillard et al. (2010) . We suggest that the unusual behaviour that we observe in this solution is likely to be related to the IR singularity which is not present in the unflavoured case. - Highlights: > We calculate quark-antiquark potentials using the Wilson loop and the action of a probe string in the string dual. > We review and categorise the possible forms of the dependence of the energy on the separation between the quarks. > We look in particular at the flavoured resolved deformed conifold. > There appears to be unusual behaviour which seems likely to be related to the IR singularity introduced by flavours.

Bennett, Stephen, E-mail: pystephen@swansea.ac.uk

2011-11-15T23:59:59.000Z

275

BAYESIAN MAGNETOHYDRODYNAMIC SEISMOLOGY OF CORONAL LOOPS  

SciTech Connect

We perform a Bayesian parameter inference in the context of resonantly damped transverse coronal loop oscillations. The forward problem is solved in terms of parametric results for kink waves in one-dimensional flux tubes in the thin tube and thin boundary approximations. For the inverse problem, we adopt a Bayesian approach to infer the most probable values of the relevant parameters, for given observed periods and damping times, and to extract their confidence levels. The posterior probability distribution functions are obtained by means of Markov Chain Monte Carlo simulations, incorporating observed uncertainties in a consistent manner. We find well-localized solutions in the posterior probability distribution functions for two of the three parameters of interest, namely the Alfven travel time and the transverse inhomogeneity length scale. The obtained estimates for the Alfven travel time are consistent with previous inversion results, but the method enables us to additionally constrain the transverse inhomogeneity length scale and to estimate real error bars for each parameter. When observational estimates for the density contrast are used, the method enables us to fully constrain the three parameters of interest. These results can serve to improve our current estimates of unknown physical parameters in coronal loops and to test the assumed theoretical model.

Arregui, I. [Departament de Fisica, Universitat de les Illes Balears, E-07122, Palma de Mallorca (Spain); Asensio Ramos, A., E-mail: inigo.arregui@uib.es, E-mail: aasensio@iac.es [Instituto de Astrofisica de Canarias, E-38205, La Laguna, Tenerife (Spain)

2011-10-10T23:59:59.000Z

276

Off-Criticality and the Massive Brownian Loop Soup  

E-Print Network (OSTI)

The Brownian loop soup is a conformally invariant Poissonian ensemble of loops in the plane recently introduced by Lawler and Werner. It has attracted significant attention for its connection to the Schramm-Loewner Evolution and Conformal Loop Ensembles and its consequent ability to describe the critical scaling limit of two-dimensional statistical mechanical models. In this paper, we introduce a natural "massive" (non-scale-invariant) version of the Brownian loop soup as a candidate to describe near-critical scaling limits, and study some of its properties, such as conformal covariance, exponential decay of correlations, and Hausdorff dimension. We also show that the massive Brownian loop soup arises as the near-critical scaling limit of a "gas" of random walk loops which is closely related to the discrete Gaussian free field.

Federico Camia

2013-09-24T23:59:59.000Z

277

Competitive Sourcing  

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

COMPETITIVE SOURCING COMPETITIVE SOURCING ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ Report on Competitive Sourcing Results Fiscal Year 2006 May 2007 Executive Office of the President Office of Management and Budget TABLE OF CONTENTS Executive Summary ...................................................................................... 1 Introduction................................................................................................. 4 I. The big picture ......................................................................................... 4 II. How public-private competition was used in FY 2006 .................................... 6 A. Anticipated benefits from competition in FY 2006

278

Direct-contact closed-loop heat exchanger  

DOE Patents (OSTI)

A high temperature heat exchanger with a closed loop and a heat transfer liquid within the loop, the closed loop having a first horizontal channel with inlet and outlet means for providing direct contact of a first fluid at a first temperature with the heat transfer liquid, a second horizontal channel with inlet and outlet means for providing direct contact of a second fluid at a second temperature with the heat transfer liquid, and means for circulating the heat transfer liquid.

Berry, Gregory F. (Naperville, IL); Minkov, Vladimir (Skokie, IL); Petrick, Michael (Joliet, IL)

1984-01-01T23:59:59.000Z

279

The Quantum Configuration Space of Loop Quantum Cosmology  

E-Print Network (OSTI)

The article gives an account of several aspects of the space known as the Bohr compactification of the line, featuring as the quantum configuration space in loop quantum cosmology, as well as of the corresponding configuration space realization of the so-called polymer representation. Analogies with loop quantum gravity are explored, providing an introduction to (part of) the mathematical structure of loop quantum gravity, in a technically simpler context.

J. M. Velhinho

2007-04-18T23:59:59.000Z

280

Air-Source Heat Pump Basics | Department of Energy  

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

Air-Source Heat Pump Basics Air-Source Heat Pump Basics Air-Source Heat Pump Basics August 19, 2013 - 11:03am Addthis Air-source heat pumps transfer heat between the inside of a building and the outside air. How Air-Source Heat Pumps Work This diagram of a split-system heat pump heating cycle shows refrigerant circulating through a closed loop that passes through the wall of a house. Inside the house the refrigerant winds through indoor coils, with a fan blowing across them, and outside the house is another fan and another set of coils, the outdoor coils. A compressor is between the coils on one half of the loop, and an expansion valve is between the coils on the other half. The diagram is explained in the caption. In heating mode, an air-source heat pump evaporates a refrigerant in the outdoor coil; as the liquid evaporates it pulls

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281

Air-Source Heat Pump Basics | Department of Energy  

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

Source Heat Pump Basics Source Heat Pump Basics Air-Source Heat Pump Basics August 19, 2013 - 11:03am Addthis Air-source heat pumps transfer heat between the inside of a building and the outside air. How Air-Source Heat Pumps Work This diagram of a split-system heat pump heating cycle shows refrigerant circulating through a closed loop that passes through the wall of a house. Inside the house the refrigerant winds through indoor coils, with a fan blowing across them, and outside the house is another fan and another set of coils, the outdoor coils. A compressor is between the coils on one half of the loop, and an expansion valve is between the coils on the other half. The diagram is explained in the caption. In heating mode, an air-source heat pump evaporates a refrigerant in the outdoor coil; as the liquid evaporates it pulls

282

Evolution and dynamics of cusped light-like Wilson loops  

E-Print Network (OSTI)

We discuss the possible relation between the singular structure of TMDs on the light-cone and the geometrical behaviour of rectangular Wilson loops.

Frederik F. Van der Veken

2013-02-27T23:59:59.000Z

283

Open versus closed loop capacity equilibria in electricity markets ...  

E-Print Network (OSTI)

May 7, 2012 ... Open versus closed loop capacity equilibria in electricity markets under ... We also present and analyze alternative conjectured price response ...

284

Chemical Looping Combustion Prototype for CO2 Capture from Existing...  

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

looping combustion prototype based on successful development and testing of a 65 kW (thermal) pilot-scale system under a previous Department of Energy (DOE) cooperative...

285

Chemical Looping Gasification for Hydrogen Enhanced Syngas Production...  

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

Chemical Looping Gasification for Hydrogen Enhanced Syngas Production with In-Situ CO2 Capture The Ohio State University (OSU) Project Number: FE0012136 Project Description The...

286

Precipitation and scaling in dynamic geothermal systems. [Titanium loop facility  

DOE Green Energy (OSTI)

A dynamic loop facility for studying scaling in simulated geothermal brines--under conditions such as will be encountered in engineering scale heat transfer equipment is being constructed. The first phase of the program consists of two principal efforts: (1) modification of an existing 100 gpm titanium loop to provide the engineering scaling test facility and (2) operation of an approximately 1 gph once-through (experimental) system to provide design data for titanium loop modifications to provide experience with scale formation and characterization. This experience is being used in planning the scaling studies to be conducted in the dynamic loop facility. The status of the project is described.

Bohlmann, E.G.; Shor, A.J.; Berlinski, P.

1976-10-01T23:59:59.000Z

287

Bosonic (meta)stabilization of cosmic string loops  

E-Print Network (OSTI)

We consider the possibility of a bosonic (meta)stabilization of a cosmic gauge string loop due to the presence of a gas of low mass bosonic particles which become trapped within the string core. This boson gas exerts a pressure which tends to counteract the string tension, allowing a circular string loop to find a finite equilibrium radius, provided that gas particles do not escape the string core. However, high energy bosons do escape, and consequently the loop shrinks and the temperature rises. Estimates indicate that the bosonic stabilization mechanism is ineffective, and the loop is unstable against decay.

J. R. Morris

2013-03-08T23:59:59.000Z

288

Experimental and computational studies of loop heat pipes.  

E-Print Network (OSTI)

??Computational and experimental investigations of fluid flow and heat transfer aspects of loop heat pipes (LHPs) are presented in this thesis. The overall goal is… (more)

Atabaki, Nima.

2006-01-01T23:59:59.000Z

289

NETL: Novel Oxygen Carriers for Coal-Fueled Chemical Looping...  

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

Chemical Looping Combustion Project No.: DE-FE0001808 NETL has partnered with Western Kentucky University to develop a series of advanced oxygen carriers for coal-fueled...

290

Hanford Site ground-water monitoring for 1993  

Science Conference Proceedings (OSTI)

This report presents the results of the Ground-Water Surveillance Project monitoring for calendar year 1993 on the Hanford Site, Washington. Hanford Site operations from 1943 onward produced large quantities of radiological and chemical waste that have impacted ground-water quality on the Site. Monitoring of water levels and ground-water chemistry is performed to track the extent of contamination and trends in contaminant concentrations. The 1993 monitoring was also designed to identify emerging ground-water quality problems. The information obtained is used to verify compliance with applicable environmental regulations and to evaluate remedial actions. Data from other monitoring and characterization programs were incorporated to provide an integrated assessment of Site ground-water quality. Additional characterization of the Site`s geologic setting and hydrology was performed to support the interpretation of contaminant distributions. Numerical modeling of sitewide ground-water flow also supported the overall project goals. Water-level monitoring was performed to evaluate ground-water flow directions, to track changes in water levels, and to relate such changes to changes in site disposal practices. Water levels over most of the Hanford Site continued to decline between June 1992 and June 1993. The greatest declines occurred in the 200-West Area. These declines are part of the continued response to the cessation of discharge to U Pond and other disposal facilities. The low permeability in this area which enhanced mounding of waste-water discharge has also slowed the response to the reduction of disposal. Water levels remained nearly constant in the vicinity of B Pond, as a result of continued disposal to the pond. Water levels measured from wells in the unconfined aquifer north and east of the Columbia River indicate that the primary source of recharge is irrigation practices.

Dresel, P.E.; Luttrell, S.P.; Evans, J.C. [and others

1994-09-01T23:59:59.000Z

291

NEUTRON SOURCES  

DOE Patents (OSTI)

A neutron source is obtained without employing any separate beryllia receptacle, as was formerly required. The new method is safer and faster, and affords a source with both improved yield and symmetry of neutron emission. A Be container is used to hold and react with Pu. This container has a thin isolating layer that does not obstruct the desired Pu--Be reaction and obviates procedures previously employed to disassemble and remove a beryllia receptacle. (AEC)

Richmond, J.L.; Wells, C.E.

1963-01-15T23:59:59.000Z

292

A Simplified Procedure for Sizing Vertical Ground Coupled Heat Pump Heat Exchangers for Residences in Texas  

E-Print Network (OSTI)

A simplified technique for the sizing of vertical U-tube ground coupled heat pump (GCHP) heat exchangers for Texas climates was developed utilizing a transient simulation model of a ground coupled heat pump and weather and soil data for Texas. The simulation model discretized the ground heat exchanger into elements and computed the temperature distribution surrounding the heat exchanger on a minute-by-minute basis. Hundreds of runs were made with the model for a wide range of ground temperatures, ground thermal properties (density, thermal conductivity, and specific heat), and outdoor weather. A set of sizing charts were developed from the model runs that could provide quick reference on the size of the ground heat exchanger. Corrections for ground temperature, ground density, ground thermal conductivity, and indoor air temperature were presented. Soil temperature and thermal conductivity were found to be the most important parameters for sizing GCHP heat exchangers. Results from the simplified method were compared to two available heat exchanger sizing methods: the National Water Well Association (NWWA) and the International Ground Source Heat Pump Association (IGSHPA). The simplified method predicted shorter lengths than those from either of these two methods.

O'Neal, D. L.; Gonzalez, J. A.; Aldred, W.

1994-01-01T23:59:59.000Z

293

Ground Magnetics (Nannini, 1986) | Open Energy Information  

Open Energy Info (EERE)

Ground Magnetics (Nannini, 1986) Ground Magnetics (Nannini, 1986) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Ground Magnetics (Nannini, 1986) Exploration Activity Details Location Unspecified Exploration Technique Ground Magnetics Activity Date Usefulness not indicated DOE-funding Unknown Notes Detection and quantitative assessment of such intrusive events can be facilitated by magnetic surveys (ground or aerial magnetic field measurements). These surveys are based on the magnetic susceptibility contrast between magmatic rocks at depth and the sedimentary formations above. References Raffaello Nannini (1986) Some Aspects Of Exploration In Non-Volcanic Areas Retrieved from "http://en.openei.org/w/index.php?title=Ground_Magnetics_(Nannini,_1986)&oldid=388291

294

A cathodically protected electrical substation ground grid  

SciTech Connect

This paper presents a discussion on the design of a cathodically protected electrical substation grounding system in which a steel ground grid and steel ground rods were used in place of the commonly used copper ground grid and copperweld ground rods. Several electrical constraints are presented which discuss common electrical utility requirements, safety considerations and economic factors. The grounding system materials which were chosen are discussed along with the means of cathodic protection. Finally, the design, construction and testing considerations are presented as an aid to others who wish to design a similar system.

Nelson, J.P.; Holm, W.K.

1983-09-01T23:59:59.000Z

295

Control Loop Tuning and Surge Response for Hanford WTP Melter Offgas Systems  

SciTech Connect

This report describes control loop tuning in models of the high level waste (HLW) melter offgas system, the low activity waste (LAW) melter offgas system and the HLW Pulse Jet Ventilation system and an assessment of the response to steam surges in both melter offgas systems. The three offgas systems were modeled using the Aspen Custom Modeler (ACM) software. The ACM models have been recently updated. Flowsheets of the system models used in this study are provided in Appendix D. To facilitate testing, these flowsheets represent somewhat simplified versions of the full models. For example, the HLW and LAW vessel ventilation systems have been represented as fixed air sources that provide a constant gas flow and specified air surges. Similarly, the six tanks and individual pulse-jet air sources in the HLW Pulse Jet Ventilation system are represented as a constant air source for control loop tuning purposes. The second LAW melter system has also been represented as a constant flow air source and several other simplifications such as removing HLW and LAW control interlocks, submerged bed scrubber bypass lines, and pressure relief valves have been made.

SMITH, FG III

2004-06-14T23:59:59.000Z

296

The integration of water loop heat pump and building structural thermal storage systems  

SciTech Connect

Commercial buildings often have extensive periods where one space needs cooling and another heating. Even more common is the need for heating during one part of the day and cooling during another in the same spaces. If a building's heating and cooling system could be integrated with the building's structural mass such that the mass can be used to collect, store, and deliver energy, significant energy might be saved. Computer models were developed to simulate this interaction for an existing office building in Seattle, Washington that has a decentralized water-source heat pump system. Metered data available for the building was used to calibrate a base'' building model (i.e., nonintegrated) prior to simulation of the integrated system. In the simulated integration strategy a secondary water loop was manifolded to the main HVAC hydronic loop. tubing in this loop was embedded in the building's concrete floor slabs. Water was routed to this loop by a controller to charge or discharge thermal energy to and from the slabs. The slabs were also in thermal communication with the conditioned spaces. Parametric studies of the building model, using weather data for five other cities in addition to Seattle, predicted that energy can be saved on cooling dominated days. On hot, dry days and during the night the cooling tower can beneficially be used as a free cooling'' source for thermally charging'' the floor slabs using cooled water. Through the development of an adaptive/predictive control strategy, annual HVAC energy savings as large as 30% appear to be possible in certain climates. 8 refs., 13 figs.

Marseille, T.J.; Schliesing, J.S.

1990-09-01T23:59:59.000Z

297

Distribution Grounding of Underground Facilities  

Science Conference Proceedings (OSTI)

This report describes Phase I of a two-phase project to assess industry practices and standards for grounding and bonding of medium-voltage underground residential distribution (URD) and underground commercial distribution (UCD) circuits and worker safety in worksites with these systems.The report includes an overview of the issues and concerns associated with underground distribution systems safety and, in particular, worker safety in worksites. It identifies the industry and utility ...

2013-12-20T23:59:59.000Z

298

Geothermal Loop Experimental Facility. Final report  

DOE Green Energy (OSTI)

Research at the Geothermal Loop Experimental Facility was successfully concluded in September 1979. In 13,000 hours of operation over a three and one half year period, the nominal 10 megawatt electrical equivalent GLEF provided the opportunity to identify problems in working with highly saline geothermal fluids and to develop solutions that could be applied to a commercial geothermal power plant producing electricity. A seven and one half year period beginning in April 1972, with early well flow testing and ending in September 1979, with the completion of extensive facility and reservoir operations is covered. During this period, the facility was designed, constructed and operated in several configurations. A comprehensive reference document, addressing or referencing documentation of all the key areas investigated is presented.

Not Available

1980-04-01T23:59:59.000Z

299

The HTGR Closed - Loop Energy System  

E-Print Network (OSTI)

This paper summarizes some of the studies performed during the past several years on the application of the high temperature gas-cooled reactor (HTGR) to the U.S. industrial energy market. The specific concept utilizes a closed-loop thermo chemical pipe (TCP), combined with the HTGR to serve dispersed industrial heat and electrical loads. Heat in various forms can be supplied at temperatures up to about 1700 F. The system substitutes nuclear energy for fluid fuels, conserves energy compared to many alternatives, and features zero emissions at the user site. Potential U.S. market size for the HTGR/TCP system appears to be approximately 8 quads per year (300 GWT to 400 GWT) in the 2000 to 2020 time period. The current U.S. HTGR development program is focused on industrial heat applications.

Leeth, G. G.

1981-01-01T23:59:59.000Z

300

Open-loop heat-recovery dryer  

DOE Patents (OSTI)

A drying apparatus is disclosed that includes a drum and an open-loop airflow pathway originating at an ambient air inlet, passing through the drum, and terminating at an exhaust outlet. A passive heat exchanger is included for passively transferring heat from air flowing from the drum toward the exhaust outlet to air flowing from the ambient air inlet toward the drum. A heat pump is also included for actively transferring heat from air flowing from the passive heat exchanger toward the exhaust outlet to air flowing from the passive heat exchanger toward the drum. A heating element is also included for further heating air flowing from the heat pump toward the drum.

TeGrotenhuis, Ward Evan

2013-11-05T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

ABJ Fractional Brane from ABJM Wilson Loop  

E-Print Network (OSTI)

We present a new Fermi gas formalism for the ABJ matrix model. This formulation takes a form that identifies the effect of the fractional M2-brane in the ABJ matrix model as that of a composite Wilson loop operator in the corresponding ABJM matrix model. Using this formalism, we study the phase dependence of the ABJ partition function numerically and find a simple rule for it. We further compute first few exact values at some coupling constants. Fitting these exact values against the expected form of the grand potential we can write down the grand potential with exact coefficients. The results at various coupling constants enable us to conjecture an explicit form of the grand potential for general coupling constants. This matches with a natural generalization of the perturbative sum, worldsheet instantons and bound states from the ABJM matrix model, but contains a minor difference in the membrane instantons.

Sho Matsumoto; Sanefumi Moriyama

2013-10-30T23:59:59.000Z

302

CX-004390: Categorical Exclusion Determination | Department of...  

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

Revised narrative and budget. Projects allowable include wind less than 20 kilowatt, rooftop solar, ground mounted solar less than 20 kilowatt, closed loop ground source heat...

303

NETL F 451.1/1-1, Categorical Exclusion Designation Form  

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

Financing Program -- Geothermal System at Common Ground School Installation of a ground-source geothermal heat pump system consisting of up to 18 closed-loop geothermal wells,...

304

Neutron Source Strength Calibrations  

Science Conference Proceedings (OSTI)

... We are in the process of installing a closed loop chilled water circulator in order to reduce temperature fluctuations of the bath caused by variations ...

2013-07-23T23:59:59.000Z

305

Competitive Sourcing  

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

Competitive Sourcing Competitive Sourcing The Department of Energy's (DOE) Competitive Sourcing program is a management initiative aimed at improving DOE's performance and reducing the Department's operational costs. The program is governed by Office of Management and Budget (OMB) Circular A- 76, Performance of Commercial Activities, dated May 29, 2003. The commercial activities selected for review and competition include functions performed by government employees that are readily available in the private sector, and where the potential for efficiencies, regardless of the winning provider, are highly likely. The candidate functions are chosen from the Department's annual Federal Activities Inventory Reform (FAIR) Act Inventory and subjected to a feasibility review to determine if a prudent business case can be made to enter

306

Neutron source  

DOE Patents (OSTI)

A neutron source which is particularly useful for neutron radiography consists of a vessel containing a moderating media of relatively low moderating ratio, a flux trap including a moderating media of relatively high moderating ratio at the center of the vessel, a shell of depleted uranium dioxide surrounding the moderating media of relatively high moderating ratio, a plurality of guide tubes each containing a movable source of neutrons surrounding the flux trap, a neutron shield surrounding one part of each guide tube, and at least one collimator extending from the flux trap to the exterior of the neutron source. The shell of depleted uranium dioxide has a window provided with depleted uranium dioxide shutters for each collimator. Reflectors are provided above and below the flux trap and on the guide tubes away from the flux trap.

Cason, J.L. Jr.; Shaw, C.B.

1975-10-21T23:59:59.000Z

307

ION SOURCE  

DOE Patents (OSTI)

The ion source described essentially eliminater the problem of deposits of nonconducting materials forming on parts of the ion source by certain corrosive gases. This problem is met by removing both filament and trap from the ion chamber, spacing them apart and outside the chamber end walls, placing a focusing cylinder about the filament tip to form a thin collimated electron stream, aligning the cylinder, slits in the walls, and trap so that the electron stream does not bombard any part in the source, and heating the trap, which is bombarded by electrons, to a temperature hotter than that in the ion chamber, so that the tendency to build up a deposit caused by electron bombardment is offset by the extra heating supplied only to the trap.

Leland, W.T.

1960-01-01T23:59:59.000Z

308

Feature Exploration for Mining Coronal Loops from Solar Images  

Science Conference Proceedings (OSTI)

Coronal loops are especially important in analyzing some important phenomena related to the Sun such as the controversial coronal heating problem. The analysis requires astrophysicists to manually sift through thousands of images in order to acquire ... Keywords: feature extraction, coronal loops, SOHO, data mining, solar

Nurcan Durak; Olfa Nasraoui

2008-11-01T23:59:59.000Z

309

Electricity generation with looped transmission networks: Bidding to an ISO  

E-Print Network (OSTI)

Electricity generation with looped transmission networks: Bidding to an ISO Xinmin Hu Daniel Ralph to model markets for delivery of electrical power on looped transmission networks. It analyzes in transmission capacity mean the ISO potentially sets a different electricity price at each node of the trans

Ferris, Michael C.

310

The Spectrum of Loop Current Variability from Gappy Data  

Science Conference Proceedings (OSTI)

The goal of this work was to understand the rate at which large anticyclonic rings are shed from the Loop Current in the Gulf of Mexico. The northward penetration of the Loop Current is used here as a surrogate variable. Data are primarily from ...

Wilton Sturges

1992-11-01T23:59:59.000Z

311

Singlet Free Energies and Renormalized Polyakov Loop in full QCD  

E-Print Network (OSTI)

We calculate the free energy of a static quark anti-quark pair and the renormalized Polyakov loop in 2+1- and 3- flavor QCD using $16^3 \\times 4$ and $16^3 \\times 6$ lattices and improved staggered p4 action. We also compare the renormalized Polyakov loop with the results of our earlier studies.

K. Petrov

2006-10-05T23:59:59.000Z

312

RADIATION SOURCES  

DOE Patents (OSTI)

A novel long-lived source of gamma radiation especially suitable for calibration purposes is described. The source of gamma radiation is denoted mock iodine131, which comprises a naixture of barium-133 and cesium-137. The barium and cesium are present in a barium-cesium ratio of approximately 5.7/1 to 14/1, uniformly dispersed in an ion exchange resin and a filter surrounding the resin comprised of a material of atomic number below approximately 51, and substantially 0.7 to 0.9 millimeter thick.

Brucer, M.H.

1958-04-15T23:59:59.000Z

313

NEUTRON SOURCE  

DOE Patents (OSTI)

A neutron source of the antimony--beryllium type is presented. The source is comprised of a solid mass of beryllium having a cylindrical recess extending therein and a cylinder containing antimony-124 slidably disposed within the cylindrical recess. The antimony cylinder is encased in aluminum. A berylliunn plug is removably inserted in the open end of the cylindrical recess to completely enclose the antimony cylinder in bsryllium. The plug and antimony cylinder are each provided with a stud on their upper ends to facilitate handling remotely.

Reardon, W.A.; Lennox, D.H.; Nobles, R.G.

1959-01-13T23:59:59.000Z

314

Warm or Steaming Ground | Open Energy Information  

Open Energy Info (EERE)

Warm or Steaming Ground Warm or Steaming Ground Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Warm or Steaming Ground Dictionary.png Warm or Steaming Ground: An area where geothermal heat is conducted to the earth's surface, warming the ground and sometimes causing steam to form when water is present. Other definitions:Wikipedia Reegle Modern Geothermal Features Typical list of modern geothermal features Hot Springs Fumaroles Warm or Steaming Ground Mudpots, Mud Pools, or Mud Volcanoes Geysers Blind Geothermal System Steam rising from the ground at Eldvorp, a 10 km row of craters, in Southwestern Iceland. http://www.visiticeland.com/SearchResults/Attraction/eldvorp Warm or steaming ground is often an indicator of a geothermal system beneath the surface. In some cases a geothermal system may not show any

315

Ground Plane Identification Using LIDAR in Forested  

E-Print Network (OSTI)

To operate autonomously in forested environments, unmanned ground vehicles (UGVs) must be able to identify the load-bearing surface of the terrain (i.e. the ground). This paper presents a novel two-stage approach for ...

McDaniel, Matt W.

316

URANIUM-BISMUTH IN-PILE CORROSION TEST LOOP. RADIATION LOOP NO. 1  

SciTech Connect

A loop was operated in the Brookhaven Graphite Research Reactor to determine the effect of in-pile irradiation on the corrosion of various materials by a U-- Bi solution. The loop wws fabricated of 21/4% chrome-1% Mo steel and contained, in the in-pile section, specimens of low-chrome steels, C steel, Mo, Be, Ta, and graphite. The U--Bi solution containing 869 ppm U/sup 235/ 98 ppm U/ sup 238/, 236 ppm Zr, and 346 ppm Mg was circulated at 51/4 gpm. A temperature difference of 75 deg C was maintained on the loop. The in-pile test section ran at 500 deg C and the finned cooler section at 425 deg C. The in-pile test section was exposed to a neutron flux of 4.4 x 10/sup 12/ neutrons/cm/sup 2/-sec which provided a fission density of 5.5 x 10/sup 10/ fissions/cm/sup 3/-sec. Metallographic examination indicated that the corrosion and/or erosion of the steel and graphite specimens was nil. Wetting of the specimens by the U-Bi solution was limited. Results indicate that in-pile and out-of-pile experimental results are similar and that fission fragment recoils did not contribute materially to either wetting or corrosion under the conditions imposed in this test. (auth)

Waide, C.H.; Kukacka, L.E.; Meyer, R.A.; Milau, J.; Klein, J.H.; Chow, J.G.Y.; Klamut, C.J.; Gurinsky, D.H.

1961-05-01T23:59:59.000Z

317

Directional Reactive Power Ground Plane Transmission  

Directional Reactive Power Ground Plane Transmission Technology Summary ... The invention can transmit electrical power through the surface of the ...

318

US ARMY GROUND VEHICLE CREW COMPARTMENT ...  

Science Conference Proceedings (OSTI)

... test fixture was constructed from an excess ground vehicle hull ... instrumentation measured acid gas exposure levels: ion selective electrodes (grab ...

2011-10-04T23:59:59.000Z

319

Sizing of Overhead Ground Wires for Lightning  

Science Conference Proceedings (OSTI)

Overhead ground wires, or shield wires, are placed on transmission lines as air terminals for lightning strikes to shield the phase conductors from direct strikes. Although of short duration, lightning strikes to ground wires may result in significant damage. Utilities are increasingly using optical fiber ground wires (OPGWs), and severe damage to the OPGWs could result in failure of the communication link. There is renewed interest in the dimensioning and testing of ground wires for improved ...

2012-12-12T23:59:59.000Z

320

Solid looping cycles: A new technology for coal conversion  

SciTech Connect

This article examines both oxygen looping cycles (otherwise known as chemical looping combustion), and lime-based CO{sub 2} looping cycles, where calcined limestone is used for in situ CO{sub 2} capture. There has been a rapid rise in the amount of research carried out recently, and both technologies are likely to see practical application in the near future. However, these technologies urgently require demonstration at the large pilot-plant level - in the case of chemical looping cycles for use with high-pressure syngas of the type likely to be produced by current coal gasification technologies and in the case of CO{sub 2} looping cycles both for combustion and gasification applications with coal. Both approaches have potential for application in schemes for H{sub 2} production, but these have not been considered here, although such applications will also inevitably follow in the medium to long term.

Anthony, E.J. [CANMET Energy Technology Centre Ottawa, Ottawa, ON (Canada). Natural Resources Canada

2008-03-19T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

A thermodynamic model for agglomeration of DNA-looping proteins  

E-Print Network (OSTI)

In this paper, we propose a thermodynamic mechanism for the formation of transcriptional foci via the joint agglomeration of DNA-looping proteins and protein-binding domains on DNA: The competition between the gain in protein-DNA binding free energy and the entropy loss due to DNA looping is argued to result in an effective attraction between loops. A mean-field approximation can be described analytically via a mapping to a restricted random-graph ensemble having local degree constraints and global constraints on the number of connected components. It shows the emergence of protein clusters containing a finite fraction of all looping proteins. If the entropy loss due to a single DNA loop is high enough, this transition is found to be of first order.

Sumedha; Martin Weigt

2008-01-09T23:59:59.000Z

322

Ground Gravity Survey At Long Valley Caldera Area (Farrar, Et Al., 2003) |  

Open Energy Info (EERE)

Ground Gravity Survey At Long Valley Caldera Area Ground Gravity Survey At Long Valley Caldera Area (Farrar, Et Al., 2003) Exploration Activity Details Location Long Valley Caldera Area Exploration Technique Ground Gravity Survey Activity Date Usefulness useful DOE-funding Unknown Notes Modeling of both deformation and microgravity data now suggests that (1) there are two inflation sources beneath the caldera, a shallower source 7-10 km beneath the resurgent dome and a deeper source ~15 km beneath the caldera's south moat and (2) the shallower source may contain components of magmatic brine and gas. At shallow depths in the caldera References Christopher D. Farrar, Michael L. Sorey, Evelyn Roeloffs, Devin L. Galloway, James F. Howle, Ronald Jacobson (2003) Inferences On The Hydrothermal System Beneath The Resurgent Dome In Long Valley Caldera,

323

Modeling reducibility on ground terms using constraints  

E-Print Network (OSTI)

Modeling reducibility on ground terms using constraints Isabelle GNAEDIGa , H´el`ene KIRCHNERb a on ground terms using (dis)equational constraints. We show in particular that innermost (ir)reducibility can on the ground term algebra that any rewriting chain starting from any term termi- nates, provided that terms

Paris-Sud XI, Université de

324

Arsenic Geochemistry in Source Waters of the Los Angeles Aqueduct  

E-Print Network (OSTI)

has focused on arsenic geochemistry in natural waters. ThisG402 XU2-7 ARSENIC GEOCHEMISTRY IN SOURCE WATERS OF T H EOrganism Interactions, Geochemistry, Ground Water Quality,

Hering, Janet G; Wilkie, Jennifer A; Chiu, Van Q

1997-01-01T23:59:59.000Z

325

AB Method of Irrigation without Water (Closed-loop water cycle)  

E-Print Network (OSTI)

Author suggests and researches a new revolutionary idea for a closed-loop irrigation method. He offers to cover a given site by a thin closed film with controlled heat conductivity and clarity located at an altitude of 50 300 m. The film is supported at altitude by small additional atmospheric overpressure and connected to the ground by thin cables. Authors show that this closed dome allows full control of the weather in a given region (the day is always fine, the rain is only at night, no strong winds). The dome (having control of the clarity of film and heat conductivity) converts the cold regions to subtropics, hot deserts and desolate wildernesses to prosperous regions with a temperate climate. This is a realistic and cheap method of evaporation economical irrigation and virtual weather control on Earth at the current time.

Alexander Bolonkin

2007-12-26T23:59:59.000Z

326

PROPAGATING SLOW MAGNETOACOUSTIC WAVES IN CORONAL LOOPS OBSERVED BY HINODE/EIS  

Science Conference Proceedings (OSTI)

We present the first Hinode/EUV Imaging Spectrometer observations of 5 minute quasi-periodic oscillations detected in a transition-region line (He II) and five coronal lines (Fe X, Fe XII, Fe XIII, Fe XIV, and Fe XV) at the footpoint of a coronal loop. The oscillations exist throughout the whole observation, characterized by a series of wave packets with nearly constant period, typically persisting for 4-6 cycles with a lifetime of 20-30 minutes. There is an approximate in-phase relation between Doppler shift and intensity oscillations. This provides evidence for slow magnetoacoustic waves propagating upward from the transition region into the corona. We find that the oscillations detected in the five coronal lines are highly correlated, and the amplitude decreases with increasing temperature. The amplitude of Doppler shift oscillations decrease by a factor of about 3, while that of relative intensity decreases by a factor of about 4 from Fe X to Fe XV. These oscillations may be caused by the leakage of the photospheric p-modes through the chromosphere and transition region into the corona, which has been suggested as the source for intensity oscillations previously observed by Transition Region and Coronal Explorer. The temperature dependence of the oscillation amplitudes can be explained by damping of the waves traveling along the loop with multithread structure near the footpoint. Thus, this property may have potential value for coronal seismology in diagnostic of temperature structure in a coronal loop.

Wang, T. J.; Ofman, L. [Department of Physics, Catholic University of America, 620 Michigan Avenue, Washington, DC 20064 (United States); Davila, J. M. [NASA Goddard Space Flight Center, Code 671, Greenbelt, MD 20771 (United States)], E-mail: wangtj@helio.gsfc.nasa.gov

2009-05-10T23:59:59.000Z

327

Impulsive magnetic pulsations and electrojets in the loop footpoint driven by the fast reconnection jet  

Science Conference Proceedings (OSTI)

It is well known that magnetic pulsations of long periods impulsively occur in accordance with the sudden onset of geomagnetic substorms and drastic enhancement of electrojets in the ionosphere. On the basis of the spontaneous fast reconnection model, the present paper examines the physical mechanism by which both magnetic pulsations and strong electrojets are impulsively driven by the fast (Alfvenic) reconnection jet. When a large-scale plasmoid [or traveling compression region (TCR)], directly caused by the fast reconnection jet, collides with the magnetic loop footpoint, strong electrojets are impulsively driven in a finite extent in the loop footpoint in accordance with the evolution of the current wedge and the generator current circuit. Simultaneously, magnetohydrodynamic (Alfven) waves, accompanied by the TCR, are reflected from the electrojet layer, leading to impulsive magnetic pulsations ahead of the loop footpoint because of the interaction (or resonance) between the reflected waves and the waves traveling toward the footpoint. The pulsations propagate outward in all directions from the source region of the wave reflection, and the pulsation periods are typically estimated to be of several tens of seconds.

Ugai, M. [Research Center for Space and Cosmic Evolution, Ehime University, Matsuyama 790-8577 (Japan)

2009-11-15T23:59:59.000Z

328

COMPETITIVE SOURCING  

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

COMPETITIVE SOURCING COMPETITIVE SOURCING EXECUTIVE STEERING GROUP MEETING PROCEEDINGS June 17, 2002 8:30 am - 11:00 am Room 5E-069 ATTENDEES John Gordon Robert Card Bruce Carnes Kathy Peery Brendan Danaher, AFGE Tony Lane Karen Evans Bill Sylvester Claudia Cross Brian Costlow Laurie Smith Helen Sherman Frank Bessera Rosalie Jordan Dennis O'Brien Mark Hively Robin Mudd Steven Apicella AGENDA 8:30 a.m. - 8:35 a.m. Opening Remarks 8:35a.m. - 8:55 a.m. Executive Steering Group roles and responsibilities, A-76 status, and talking points Team Briefings 8:55 a.m. - 9:20 a.m. Information Technology Study 9:20 a.m. - 9:45 a.m. Financial Services Study

329

ION SOURCE  

DOE Patents (OSTI)

An ion source is described and comprises an arc discharge parallel to the direction of and inside of a magnetic field. an accelerating electrode surrounding substantially all of the discharge except for ion exit apertures, and means for establishing an electric field between that electrode and the arc discharge. the electric field being oriented at an acute angle to the magnetic field. Ions are drawn through the exit apertures in the accelrating electrcde in a direction substantially divergent to the direction of the magnetic field and so will travel in a spiral orbit along the magnetic field such that the ions will not strike the source at any point in their orbit within the magnetic field.

Blue, C.W.; Luce, J.S.

1960-07-19T23:59:59.000Z

330

Laser photon statistics in the feedback loop  

E-Print Network (OSTI)

A mere correspondence between the electron statistics and the photon one vanishes in the feedback loop (FBL). It means that the direct photodetection, supplying us with the electron statistics, does not provide us with a wished information about the laser photon statistics. For getting this information we should think up another measurement procedure, and we in the article suggest applying the three-level laser as a auxiliary measuring device. This laser has impressive property, namely, its photon statistics survive information about the initial photon statistics of the laser which excites coherently the three-level medium. Thus, if we choose the laser in the FBL as exciting the three-level laser, then we have an possibility to evaluate its initial photon statistics by means of direct detecting the three-level laser emission. Finally, this approach allows us to conclude the feedback is not capable of creating a regularity in the laser light beam. Contrary, the final photon fluctuations turn out to be always even bigger. The mentioned above feature of the three-level laser takes place only for the strong interaction between the lasers (exciting and excited). It means the initial state of the exciting laser is changed dramatically, so our measurement procedure can not be identified with some non-demolition one.

T. Yu. Golubeva; Yu. M. Golubev

2005-04-23T23:59:59.000Z

331

TS LOOP NON-POTABLE PUMP EVALUATION  

SciTech Connect

This analysis evaluates the existing subsurface non-potable water system from the portal pump to the end of the water line in the South Ramp and determines if the pump size and spacing meets the system pressure and flow requirements for construction operations and incipient fire fighting capability as established in the Subsurface Fire Hazards Analysis (CRWMS M&O 1998b). This analysis does not address the non potable water system in the Cross Drift which is covered under a previous design analysis (CRWMS-M&O 1998a). The Subsurface Fire Hazards Analysis references sections of OSHA 29 CFR 1910 Subpart L for requirements applicable to the incipient fire fighting hose stations used underground. This analysis does not address mechanical system valves, fittings, risers and other components of the system piping. This system is not designed or intended to meet all National Fire Protection Association (NFPA) codes for a fire fighting system but is only considered a backup system to fire extinguishers that are installed throughout the Topopah Springs (TS) Loop and may be used to fight small incipient stage fires.

S. Goodin

1999-05-14T23:59:59.000Z

332

EXAMINATION OF Zr AND Ti RECOMBINER LOOP SPECIMENS  

DOE Green Energy (OSTI)

Cold-worked specimens of iodide zirconium, Zircaloy-2, iodide titanium, and A-55 titanium were tested in a high-pressure recombiner loop in an attempt to duplicate anomalous results obtained in a prior recombiner loop. Hydrogen analyses and metallographic examinations were made on all specimens. The titanium materials and Zircaloy-2 picked up major amounts of hydrogen in the cell section. None of the materials tested showed appreciable hydrogen absorption in the recombiner section. Complete recrystallization occurred in all cell specimens while only Zircaloy-2, of the recombiner specimens, showed any degree of recrystallization. No explanation for this behavior can be given. A survnnary of the data obtained in previous recombiner loops is compared with the results of this loop. Conclusions were based on the results of three recombiner loops. Primarlly because of the hydrogen absorption data obtained in all three recombiner loops it is recommended that the zirconium and titunium materials tested not be used in environments similar to those encountered in high pressure recombiner loops. (auth)

Rittenhouse, P.L.

1958-12-19T23:59:59.000Z

333

Observation of multiple sausage oscillations in cool postflare loop  

E-Print Network (OSTI)

Using simultaneous high spatial (1.3 arc sec) and temporal (5 and 10 s) resolution H-alpha observations from the 15 cm Solar Tower Telescope at ARIES, we study the oscillations in the relative intensity to explore the possibility of sausage oscillations in the chromospheric cool postflare loop. We use standard wavelet tool, and find the oscillation period of ~ 587 s near the loop apex, and ~ 349 s near the footpoint. We suggest that the oscillations represent the fundamental and the first harmonics of fast sausage waves in the cool postflare loop. Based on the period ratio P1/P2 ~ 1.68, we estimate the density scale height in the loop as ~ 17 Mm. This value is much higher than the equilibrium scale height corresponding to H-alpha temperature, which probably indicates that the cool postflare loop is not in hydrostatic equilibrium. Seismologically estimated Alfv\\'en speed outside the loop is ~ 300-330 km/s. The observation of multiple oscillations may play a crucial role in understanding the dynamics of lower solar atmosphere, complementing such oscillations already reported in the upper solar atmosphere (e.g., hot flaring loops).

A. K. Srivastava; T. V. Zaqarashvili; W. Uddin; B. N. Dwivedi; Pankaj Kumar

2008-06-05T23:59:59.000Z

334

Iterational retiming: Maximize iteration-level parallelism for nested loops  

E-Print Network (OSTI)

Nested loops are the most critical sections in many scientific and Digital Signal Processing (DSP) applications. It is important to study effective and efficient transformation techniques to increase parallelism for nested loops. In this paper, we propose a novel technique, iterational retiming, that can satisfy any given timing constraint by achieving full parallelism for iterations in a partition. Theorems and efficient algorithms are proposed for iterational retiming. The experimental results show that iterational retiming is a promising technique for parallel embedded systems. It can achieve 87% improvement over software pipelining and 88 % improvement over loop unfolding on average.

Chun Xue; Zili Shao; Meilin Liu; Edwin H. -m. Sha

2005-01-01T23:59:59.000Z

335

Fiber-bragg grating-loop ringdown method and apparatus  

Science Conference Proceedings (OSTI)

A device comprising a fiber grating loop ringdown (FGLRD) system of analysis is disclosed. A fiber Bragg grating (FBG) or Long-Period grating (LPG) written in a section of single mode fused silica fiber is incorporated into a fiber loop. By utilizing the wing areas of the gratings' bandwidth as a wavelength dependent attenuator of the light transmission, a fiber grating loop ringdown concept is formed. One aspect of the present invention is temperature sensing, which has been demonstrated using the disclosed device. Temperature measurements in the areas of accuracy, stability, high temperature, and dynamic range are also described.

Wang, Chuji (Starkville, MS)

2008-01-29T23:59:59.000Z

336

Fiber-bragg grating-loop ringdown method and apparatus  

DOE Patents (OSTI)

A device comprising a fiber grating loop ringdown (FGLRD) system of analysis is disclosed. A fiber Bragg grating (FBG) or Long-Period grating (LPG) written in a section of single mode fused silica fiber is incorporated into a fiber loop. By utilizing the wing areas of the gratings' bandwidth as a wavelength dependent attenuator of the light transmission, a fiber grating loop ringdown concept is formed. One aspect of the present invention is temperature sensing, which has been demonstrated using the disclosed device. Temperature measurements in the areas of accuracy, stability, high temperature, and dynamic range are also described.

Wang, Chuji (Starkville, MS)

2008-01-29T23:59:59.000Z

337

Zipping and Unzipping of Cosmic String Loops in Collision  

E-Print Network (OSTI)

In this paper the collision of two cosmic string loops is studied. After collision junctions are formed and the loops are entangled. We show that after their formation the junctions start to unzip and the loops disentangle. This analysis provides a theoretical understanding of the unzipping effect observed in numerical simulations of a network of cosmic strings with more than one type of cosmic strings. The unzipping phenomena have important effects in the evolution of cosmic string networks when junctions are formed upon collision, such as in a network of cosmic superstrings.

Hassan Firouzjahi; Johanna Karouby; Shahram Khosravi; Robert Brandenberger

2009-07-28T23:59:59.000Z

338

Direct-contact closed-loop heat exchanger  

DOE Patents (OSTI)

A high temperature heat exchanger is disclosed which has a closed loop and a heat transfer liquid within the loop, the closed loop having a first horizontal channel with inlet and outlet means for providing direct contact of a first fluid at a first temperature with the heat transfer liquid, a second horizontal channel with inlet and outlet means for providing direct contact of a second fluid at a second temperature with the heat transfer liquid, and means for circulating the heat transfer liquid.

Berry, G.F.; Minkov, V.; Petrick, M.

1981-11-02T23:59:59.000Z

339

Equivalence of string and fusion loop-spin structures  

E-Print Network (OSTI)

The importance of the fusion relation of loops was recognized in the context of spin structures on the loop space by Stolz and Teichner and further developed by Waldorf. On a spin manifold M the equivalence classes of `fusive' spin structures on the loop space LM, incorporating the fusion property, strong regularity and reparameterization-invariance, are shown to be in 1-1 correspondence with equivalence classes of string structures on M. The identification is through the affine space of `string' cohomology classes considered by Redden.

Chris Kottke; Richard Melrose

2013-09-01T23:59:59.000Z

340

Beam-based Feedback for the Linac Coherent Light Source  

SciTech Connect

Beam-based feedback control loops are required by the Linac Coherent Light Source (LCLS) program in order to provide fast, single-pulse stabilization of beam parameters. Eight transverse feedback loops, a 6 x 6 longitudinal feedback loop, and a loop to maintain the electron bunch charge were successfully prototyped in MATLAB for the LCLS, and have been maintaining stability of the LCLS electron beam at beam rates up to 30Hz. In the final commissioning phase of LCLS the beam will be operating at up to 120Hz. In order to run the feedback loops at beam rate, the feedback loops will be implemented in EPICS IOCs with a dedicated ethernet multi-cast network. This paper will discuss the design of the beam-based Fast Feedback System for LCLS. Topics include MATLAB feedback prototyping, algorithm for 120Hz feedback, network design for fast data transport, actuator and sensor design for single-pulse control and sensor readback, and feedback configuration and runtime control.

Fairley, D.; Allison, S.; Chevtsov, S.; Chu, P.; Decker, F.J.; Emma, P.; Frisch, J.; Himel, T.; Kim, K.; Krejcik, P.; Loos, H.; Lahey, T.; Natampalli, P.; Peng, S.; Rogind, D.; Shoaee, H.; Straumann, T.; Williams, E.; White, G.; Wu, J.; Zelazney, M.; /SLAC

2010-02-11T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Boosted Fast Flux Loop Alternative Cooling Assessment  

Science Conference Proceedings (OSTI)

The Gas Test Loop (GTL) Project was instituted to develop the means for conducting fast neutron irradiation tests in a domestic radiation facility. It made use of booster fuel to achieve the high neutron flux, a hafnium thermal neutron absorber to attain the high fast-to-thermal flux ratio, a mixed gas temperature control system for maintaining experiment temperatures, and a compressed gas cooling system to remove heat from the experiment capsules and the hafnium thermal neutron absorber. This GTL system was determined to provide a fast (E > 0.1 MeV) flux greater than 1.0E+15 n/cm2-s with a fast-to-thermal flux ratio in the vicinity of 40. However, the estimated system acquisition cost from earlier studies was deemed to be high. That cost was strongly influenced by the compressed gas cooling system for experiment heat removal. Designers were challenged to find a less expensive way to achieve the required cooling. This report documents the results of the investigation leading to an alternatively cooled configuration, referred to now as the Boosted Fast Flux Loop (BFFL). This configuration relies on a composite material comprised of hafnium aluminide (Al3Hf) in an aluminum matrix to transfer heat from the experiment to pressurized water cooling channels while at the same time providing absorption of thermal neutrons. Investigations into the performance this configuration might achieve showed that it should perform at least as well as its gas-cooled predecessor. Physics calculations indicated that the fast neutron flux averaged over the central 40 cm (16 inches) relative to ATR core mid-plane in irradiation spaces would be about 1.04E+15 n/cm2-s. The fast-to-thermal flux ratio would be in excess of 40. Further, the particular configuration of cooling channels was relatively unimportant compared with the total amount of water in the apparatus in determining performance. Thermal analyses conducted on a candidate configuration showed the design of the water coolant and Al-Hf alloy heat sink system is capable of maintaining all system components below their maximum temperature limits. The maximum temperature of this conduction cooling system, 224.2°C (435.6 °F) occurs in a small, localized region in the heat sink structure near the core mid-plane. The total coolant flow rate requirement for this configuration is 207 L/min (54.7 gpm). The calculated Flow Instability Ratio and Departure from Nucleate Boiling Ratio for this configuration under nominal conditions are 6.5 and 8.0, respectively, which safely exceed the minimum values of 2.0. Materials and fabrication issues inspection revealed that the neutron absorber would probably best be made from powdered Al3Hf mixed with aluminum powder and extruded or hot isostatically pressed. Although Al3Hf has not been specifically studied extensively, its mechanical and chemical properties should be very much like Al3Zr, which has been studied. Its behavior under irradiation should be very satisfactory, and resistance to corrosion will be investigated to a limited extent in planned miniplate irradiation tests in ATR. Pressurized water systems needed to effect heat removal are already available in the ATR complex, and mixed gas temperature control systems needed to trim experiment temperatures have been engineered and need only be fabricated and installed. In sum, it appears the alternately cooled configuration arrived at can be very successful. The cost estimate for this configuration indicates to

Glen R. Longhurst; Donna Post Guillen; James R. Parry; Douglas L. Porter; Bruce W. Wallace

2007-08-01T23:59:59.000Z

342

Ground coupled solar heat pump research program in the United States  

DOE Green Energy (OSTI)

The ground coupling research program funded by the Systems Development Division of the Office of Solar Applications of the US Department of Energy studies the use of the earth as a heat source/sink or storage element for solar heat pump space conditioning systems. The goal of this research program is to determine the feasibility of ground coupling, and if feasibility is confirmed, to create handbooks which facilitate widespread application of ground coupling. The research program is outlined and the research projects currently in progress and how they fit into the program are described. Progress toward the program goal is evaluated.

Metz, P D

1980-01-01T23:59:59.000Z

343

Ground Gravity Survey At Coso Geothermal Area (1990) | Open Energy  

Open Energy Info (EERE)

Coso Geothermal Area (1990) Coso Geothermal Area (1990) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Ground Gravity Survey At Coso Geothermal Area (1990) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Ground Gravity Survey Activity Date 1990 Usefulness not indicated DOE-funding Unknown Exploration Basis To identify features related to the heat source and to seek possible evidence for an underlying magma chamber Notes 2D and 3D gravity modeling was done using gridded Bouguer gravity data covering a 45 by 45 km region over the Coso geothermal area. Isostatic and terrain corrected Bouguer gravity data for about 1300 gravity stations were obtained from the US Geological Survey. After the data were checked, the gravity values were gridded at 1 km centers for the area of interest

344

High Spatial Resolution Observations of Loops in the Solar Corona  

E-Print Network (OSTI)

Understanding how the solar corona is structured is of fundamental importance to determining how the Sun's upper atmosphere is heated to high temperatures. Recent spectroscopic studies have suggested that an instrument with a spatial resolution of 200km or better is necessary to resolve coronal loops. The High Resolution Coronal Imager (Hi-C) achieved this performance on a rocket flight in July 2012. We use Hi-C data to measure the Gaussian widths of 91 loops observed in the solar corona and find a distribution that peaks at about 270km. We also use Atmospheric Imaging Assembly (AIA) data for a subset of 79 of these loops and find that their temperature distributions are narrow. These observations provide further evidence that loops in the solar corona are structured at a scale of several hundred kilometers, well above the spatial scale of proposed physical mechanisms.

Brooks, David H; Ugarte-Urra, Ignacio; Winebarger, Amy R

2013-01-01T23:59:59.000Z

345

Loop Current Response to Hurricanes Isidore and Lili  

Science Conference Proceedings (OSTI)

Recent hurricane activity over the Gulf of Mexico basin has underscored the importance of the Loop Current (LC) and its deep, warm thermal structure on hurricane intensity. During Hurricanes Isidore and Lili in 2002, research flights were ...

Lynn K. Shay; Eric W. Uhlhorn

2008-09-01T23:59:59.000Z

346

Sodium Plugging Test Loop - Nuclear Engineering Division (Argonne)  

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

Sodium Plugging Test Loop Sodium Plugging Test Loop Sodium Plugging Test Loop Overview Other Facilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Sodium Plugging Test Loop This experimental setup is part of the Global Nuclear Energy Partnership (GNEP) Advanced Fuel Cycle R&D work carried out at Argonne on advanced sodium component technology. Bookmark and Share For long range sodium technology research and development, employing supercritical CO2 Brayton cycle power conversion technology as an advanced balance of plant technology is being considered. The component that provides the interface between the sodium and supercritical CO2 is a compact heat exchanger known as a printed circuit heat exchanger (PCHE). This heat exchanger has very small coolant flow passages that may foul or

347

Coal Direct Chemical Looping Retrofit for Pulverized Coal-Fired...  

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

Coal Direct Chemical Looping Retrofit for Pulverized Coal-Fired Power Plants with In-Situ CO 2 Capture Background Pulverized coal (PC)-fired power plants provide nearly 50% of...

348

The search for the phonological store: From loop to convolution  

Science Conference Proceedings (OSTI)

The phonological loop system of Baddeley and colleagues' Working Memory model is a major accomplishment of the modern era of cognitive psychology. It was one of the first information processing models to make an explicit attempt to accommodate both traditional ...

Bradley R. Buchsbaum; Mark D'Esposito

2008-05-01T23:59:59.000Z

349

A Numerical Study of Loop Current Intrusions and Eddy Shedding  

Science Conference Proceedings (OSTI)

The dynamics of the eddy shedding by the Loop Current in the Gulf of Mexico have been investigated using three nonlinear numerical models: two-layer, barotropic and reduced gravity. The barotropic and reduced gravity models demonstrate the ...

H. E. Hurlburt; J. Dana Thompson

1980-10-01T23:59:59.000Z

350

N >= 4 Supergravity Amplitudes from Gauge Theory at Two Loops  

SciTech Connect

We present the full two-loop four-graviton amplitudes in N = 4, 5, 6 supergravity. These results were obtained using the double-copy structure of gravity, which follows from the recently conjectured color-kinematics duality in gauge theory. The two-loop four-gluon scattering amplitudes in N = 0, 1, 2 supersymmetric gauge theory are a second essential ingredient. The gravity amplitudes have the expected infrared behavior: the two-loop divergences are given in terms of the squares of the corresponding one-loop amplitudes. The finite remainders are presented in a compact form. The finite remainder for N = 8 supergravity is also presented, in a form that utilizes a pure function with a very simple symbol.

Boucher-Veronneau, C.; Dixon, L.J.; /SLAC

2012-02-15T23:59:59.000Z

351

Geometry of loop quantum gravity on a graph  

SciTech Connect

We discuss the meaning of geometrical constructions associated to loop quantum gravity states on a graph. In particular, we discuss the 'twisted geometries' and derive a simple relation between these and Regge geometries.

Rovelli, Carlo; Speziale, Simone [Centre de Physique Theorique, CNRS-Luminy Case 907, 13288 Marseille Cedex 09 (France)

2010-08-15T23:59:59.000Z

352

Corrosion of alloy 718 in a mercury thermal convection loop  

SciTech Connect

Two thermal convection loops (TCLs) fabricated from annealed alloy 718 continuously circulated mercury (Hg) with 1000 wppm gallium (Ga), respectively, for about 5000 h, duplicating previous TCL tests for annealed 316L. In each case, the maximum loop temperature was 305C, the minimum temperature was 242C, and the Hg flow rate was approximately 1.2 m/min. Unlike the 316L exposed to Hg, which above about 260C exhibited a thin, porous surface layer depleted in Ni and Cr, the alloy 718 coupons revealed essentially no wetting and, therefore, no interaction with that Hg at any temperature. Alloy 718 coupons suspended in the loops revealed inconsequentially small weight changes, and both the coupons and loop tubing exhibited no detectable metallographic evidence of attack.

Pawel, S.J.; DiStefano, J.R.; Manneschmidt, E.T.

1999-12-01T23:59:59.000Z

353

Oxygen Carriers for Solid Fuel Chemical Looping Combustion Process  

This patent-pending technology, “Regenerable Mixed Copper-Iron-Inert Support Oxygen Carriers for Solid Fuel Chemical Looping Combustion Process,” provides a metal-oxide oxygen carrier for application in fuel combustion processes that use oxygen.

354

Topological interactions between ring polymers: Implications for chromatin loops  

E-Print Network (OSTI)

Chromatin looping is a major epigenetic regulatory mechanism in higher eukaryotes. Besides its role in transcriptional regulation, chromatin loops have been proposed to play a pivotal role in the segregation of entire chromosomes. The detailed topological and entropic forces between loops still remain elusive. Here, we quantitatively determine the potential of mean force between the centers of mass of two ring polymers, i.e. loops. We find that the transition from a linear to a ring polymer induces a strong increase in the entropic repulsion between these two polymers. On top, topological interactions such as the non-catenation constraint further reduce the number of accessible conformations of close-by ring polymers by about 50%, resulting in an additional effective repulsion. Furthermore, the transition from linear to ring polymers displays changes in the conformational and structural properties of the system. In fact, ring polymers adopt a markedly more ordered and aligned state than linear ones. The force...

Bohn, Manfred

2010-01-01T23:59:59.000Z

355

A Trigger Mechanism for Loop Current Ring Separations  

Science Conference Proceedings (OSTI)

The Loop Current in the Gulf of Mexico sheds large anticyclonic rings on an irregular basis. The authors attempt to show what actually triggers the ring separations. Pulses of increased transport through the Florida Straits, as observed by the ...

Wilton Sturges; Nicholas G. Hoffmann; Robert R. Leben

2010-05-01T23:59:59.000Z

356

Investigations of tetraspanin functions using large extracellular loops  

E-Print Network (OSTI)

This thesis describes our characterization of a specific tetraspanin domain: the large extracellular loop (LEL). Tetraspanins are involved in cellular migration, adhesion, and metastasis, sperm-egg fusion, and viral ...

Liu, Christopher C

2005-01-01T23:59:59.000Z

357

Loop Current Eddy Paths in the Western Gulf of Mexico  

Science Conference Proceedings (OSTI)

The paths of anticyclonic Loop Current eddies in the western Gulf of Mexico have been investigated using ARGOS-tracked drifters accompanied by hydrographic surveys. The analysis used orbit parameters derived from a least square fit of a ...

Peter Hamilton; G. S. Fargion; D. C. Biggs

1999-06-01T23:59:59.000Z

358

Snowmass Benchmark Points and Three-Loop Running  

E-Print Network (OSTI)

We present the full three-loop beta-functions for the MSSM generalised to include additional matter multiplets in 5, 10 representations of SU(5). We analyse in detail the effect of three-loop running on the sparticle spectrum for the MSSM Snowmass Benchmark Points. We also consider the effect on these spectra of additional matter multiplets (the semi-perturbative unification scenario).

I. Jack; D. R. T. Jones; A. F. Kord

2004-08-10T23:59:59.000Z

359

Experimental Research of Air Source Heat Pump Frosting and Defrosting in a Double Stage-Coupling Heat Pump  

E-Print Network (OSTI)

In a double stage-coupling heat pump, comprising an air source and water loop heat pump, the 13~20 ? low temperature water is supplied to the water loop heat pump unit. The water loop heat pump can extract heat from the water and heat the indoor air. The most common method of air source heat pump frost removal is reverse-cycle defrost. During the defrosting operation, the heat pump runs in the cooling mode. The defrost process is accomplished by reversing the normal heating mode. In this paper, the effect of the heat storage tank to the air source heat pump defrosting is test. Owing to the existence of the heat storage tank, thermal inertia of the loop is relatively high. The frosting and defrosting course of the air source heat pump have little effect on the room temperature.

Wang, Z.; Gu, J.; Lu, Z.

2006-01-01T23:59:59.000Z

360

Condition Assessment of Substation Ground Grids  

Science Conference Proceedings (OSTI)

This report describes the first stage of research to develop a simple and inexpensive method and device to assess the integrity of substation grounding grids. The problem has been studied before but there is not, to our knowledge, a reliable and inexpensive method or device to make a reliable diagnosis. While the EPRI-developed Ground Grid Evaluator (commercially knows as the Smart Ground Multimeter or SGM) can be used to provide valuable information, the equipment is considered to be expensive and requi...

2008-03-26T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Condition Assessment of Substation Ground Grids  

Science Conference Proceedings (OSTI)

This report describes the second stage of a research project to develop a simple and inexpensive method and device to assess the integrity of substation grounding grids. The problem has been studied before but a reliable and inexpensive method or device to make a reliable diagnosis of grid condition is still lacking. While the EPRI-developed Ground Grid Evaluator (commercially known as the Smart Ground Multimeter) can be used to provide valuable information, the equipment is expensive and requires extens...

2008-12-17T23:59:59.000Z

362

HEATING OF FLARE LOOPS WITH OBSERVATIONALLY CONSTRAINED HEATING FUNCTIONS  

SciTech Connect

We analyze high-cadence high-resolution observations of a C3.2 flare obtained by AIA/SDO on 2010 August 1. The flare is a long-duration event with soft X-ray and EUV radiation lasting for over 4 hr. Analysis suggests that magnetic reconnection and formation of new loops continue for more than 2 hr. Furthermore, the UV 1600 Angstrom-Sign observations show that each of the individual pixels at the feet of flare loops is brightened instantaneously with a timescale of a few minutes, and decays over a much longer timescale of more than 30 minutes. We use these spatially resolved UV light curves during the rise phase to construct empirical heating functions for individual flare loops, and model heating of coronal plasmas in these loops. The total coronal radiation of these flare loops are compared with soft X-ray and EUV radiation fluxes measured by GOES and AIA. This study presents a method to observationally infer heating functions in numerous flare loops that are formed and heated sequentially by reconnection throughout the flare, and provides a very useful constraint to coronal heating models.

Qiu Jiong; Liu Wenjuan; Longcope, Dana W. [Department of Physics, Montana State University, Bozeman, MT 59717-3840 (United States)

2012-06-20T23:59:59.000Z

363

2F and 2H evaporator loop evaluation closure report  

SciTech Connect

As a result of the Concentrate Transfer System (CTS) tank ventilation system contamination event, a task team was formed to evaluate instrument loops associated with waste reduction equipment. During the event a conductivity probe designed to provide an alarm and initiate an interlock failed to respond to the presence of liquid. An investigation revealed that the probe had become disconnected from the loop. The daily functional check of the conductivity probe circuit only tested the circuit continuity from the ventilation unit to the control room and did not actually test the probe. To test the continuity, a test switch was used to simulate the conducting probe. Because the functional check did not test each part of the loop, the test could be satisfactorily completed even though the probe itself was inoperable. The function of the task team was to develop a list of loops and interlocks prioritized by importance and likelihood of similar failure. The team evaluated the associated loop calibration and functional test procedures to verify that they are adequate to ensure loop performance on a periodic frequency. This report documents the evaluation findings and associated actions required prior to startup of the 2F and 2H evaporators.

Bates, W.F.

1994-01-28T23:59:59.000Z

364

Triple loop heat exchanger for an absorption refrigeration system  

DOE Patents (OSTI)

A triple loop heat exchanger for an absorption refrigeration system is disclosed. The triple loop heat exchanger comprises portions of a strong solution line for conducting relatively hot, strong solution from a generator to a solution heat exchanger of the absorption refrigeration system, conduit means for conducting relatively cool, weak solution from the solution heat exchanger to the generator, and a bypass system for conducting strong solution from the generator around the strong solution line and around the solution heat exchanger to an absorber of the refrigeration system when strong solution builds up in the generator to an undesirable level. The strong solution line and the conduit means are in heat exchange relationship with each other in the triple loop heat exchanger so that, during normal operation of the refrigeration system, heat is exchanged between the relatively hot, strong solution flowing through the strong solution line and the relatively cool, weak solution flowing through the conduit means. Also, the strong solution line and the bypass system are in heat exchange relationship in the triple loop heat exchanger so that if the normal flow path of relatively hot, strong solution flowing from the generator to an absorber is blocked, then this relatively, hot strong solution which will then be flowing through the bypass system in the triple loop heat exchanger, is brought into heat exchange relationship with any strong solution which may have solidified in the strong solution line in the triple loop heat exchanger to thereby aid in desolidifying any such solidified strong solution.

Reimann, Robert C. (Lafayette, NY)

1984-01-01T23:59:59.000Z

365

COMPETITIVE SOURCING  

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

EXECUTIVE STEERING GROUP Meeting Proceedings October 30, 2002 Room 6E-069, 10:30 - 12:00 Agenda Opening Remarks Bruce Carnes Competitive Sourcing Update Denny O'Brien Team Briefings Team Leads ESG Discussion/Wrap up Bruce Carnes Attendees Bruce Carnes, Acting Chair MaryAnn Shebek Robert Card Prentis Cook Ambassador Brooks Tony Lane Kyle McSlarrow Karen Evans Suzanne Brennan, NTEU Claudia Cross Brian Costlow Helen Sherman Frank Bessera Laurie Morman Denny O'Brien Travis McCrory Bill Pearce Jeff Dowl Mark Hively Steven Apicella Robin Mudd Bruce Carnes chaired the meeting and began with welcoming NTEU to the meeting. In regard to the OMB's Balanced Scorecard, the Department has achieved a Green on progress and we are close to achieving a yellow on status.

366

Ground Electromagnetic Techniques | Open Energy Information  

Open Energy Info (EERE)

Ground Electromagnetic Techniques Ground Electromagnetic Techniques (Redirected from Ground Electromagnetic Methods) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Ground Electromagnetic Techniques Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Electromagnetic Techniques Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water Thermal: Resistivity influenced by temperature

367

Recent ground motion studies at Fermilab  

SciTech Connect

Understanding slow and fast ground motion is important for the successful operation and design for present and future colliders. Since 2000 there have been several studies of ground motion at Fermilab. Several different types of HLS (hydro static level sensors) have been used to study slow ground motion (less than 1 hertz) seismometers have been used for fast (greater than 1 hertz) motions. Data have been taken at the surface and at locations 100 meters below the surface. Data of recent slow ground motion measurements with HLSs, many years of alignment data and results of the ATL-analysis are presented and discussed.

Shiltsev, V.; Volk, J.; /Fermilab; Singatulin, S.; /Novosibirsk, IYF

2009-04-01T23:59:59.000Z

368

Pacific Northwest National Laboratory Grounds Maintenance  

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

Pacific Northwest National Laboratory (PNNL) operates an award-winning grounds maintenance program that comprises a comprehensive landscape and irrigation management program. The...

369

US ARMY GROUND VEHICLE HALON REPLACEMENT ...  

Science Conference Proceedings (OSTI)

... test fixture has been constructed from a derelict ground vehicle hull ... exposure levels: ion selective electrodes (grab hag sampling), sorbent tubes ...

2011-10-04T23:59:59.000Z

370

Closed loop chemical systems for energy storage and transmission (chemical heat pipe). Final report  

DOE Green Energy (OSTI)

The work documents the anlaysis of closed loop chemical systems for energy storage and transmission, commonly referred to as the Chemical Heat Pipe (CHP). Among the various chemical reaction systems and sources investigated, the two best systems were determined to be the high temperature methane/steam reforming reaction (HTCHP) coupled to a Very High Temperature Gas Cooled Reactor (VHTR) and the lower temperature, cyclohexane dehydrogenation reaction (LTCHP) coupled to existing sources such as coal or light water reactors. Solar and other developing technologies can best be coupled to the LTCHP. The preliminary economic and technical analyses show that both systems could transport heat at an incremental cost of approximately $1.50/GJ/160 km (in excess of the primary heat cost of $2.50/GJ), at system efficiencies above 80%. Solar heat can be transported at an incremental cost of $3/GJ/160 km. The use of the mixed feed evaporator concept developed in this work contributes significantly to reducing the transportation cost and increasing the efficiency of the system. The LTCHP shows the most promise of the two systems if the technical feasibility of the cyclic closed loop chemical reaction system can be established. An experimental program for establishing this feasibility is recommended. Since the VHTR is several years away from commercial demonstration and the HTCHP chemical technology is well developed, future HTCHP programs should be aimed at VHTR and interface problems.

Vakil, H.B.; Flock, J.W.

1978-02-01T23:59:59.000Z

371

Semantic-driven Parallelization of Loops Operating on User-defined Containers  

SciTech Connect

The authors describe ROSE, a C++ infrastructure for source-to-source translation, that provides an interface for programmers to easily write their own translators for optimizing user-defined high-level abstractions. Utilizing the semantics of these high-level abstractions, they demonstrate the automatic parallelization of loops that iterate over user-defined containers that have interfaces similar to the lists, vectors and sets in the Standard Template Library (STL). The parallelization is realized in two phases. First, they insert OpenMP directives into a serial program, driven by the recognition of the high-level abstractions, containers, that are thread-safe. Then, they translate the OpenMP directives into library routines that explicitly create and manage parallelism. By providing an interface for the programmer to classify the semantics of their abstractions, they are able to automatically parallelize operations on containers, such as linked-lists, without resorting to complex loop dependence analysis techniques. The approach is consistent with general goals within telescoping languages.

Quinlan, D; Schordan, M; Yi, Q; de Supinski, B R

2003-07-09T23:59:59.000Z

372

Dynamic structural analysis of a head assembly for a large loop-type LMFBR  

SciTech Connect

An investigation is presented on the dynamic structural response of the primary vessel's head closure to slug impact loadings generated from a 1000 MJ source term. The reference reactor considered was designed in a loop configuration. The head structure consisted of a deck and a triple rotatable plug assembly. Two designs were considered for the deck structure: a reference design and an alternate design. The reference deck was designed as a single flat annular plate. For the alternate design, the deck plate was reinforced by adding an extender cylinder with a flange and flanged webs between the deck-plate and cylinder. The investigation showed that the reference design cannot maintain containment integrity when subjected to slug loading generated by a 1000 MJ source term. It was determined that the head deformed excessively.

Kulak, R.F.; Fiala, C.

1984-01-01T23:59:59.000Z

373

THREE-DIMENSIONAL SIMULATIONS OF GYROSYNCHROTRON EMISSION FROM MILDLY ANISOTROPIC NONUNIFORM ELECTRON DISTRIBUTIONS IN SYMMETRIC MAGNETIC LOOPS  

Science Conference Proceedings (OSTI)

Microwave emission of solar flares is formed primarily by incoherent gyrosynchrotron radiation generated by accelerated electrons in coronal magnetic loops. The resulting emission depends on many factors, including pitch-angle distribution of the emitting electrons and the source geometry. In this work, we perform systematic simulations of solar microwave emission using recently developed tools (GS Simulator and fast gyrosynchrotron codes) capable of simulating maps of radio brightness and polarization as well as spatially resolved emission spectra. A three-dimensional model of a symmetric dipole magnetic loop is used. We compare the emission from isotropic and anisotropic (of loss-cone type) electron distributions. We also investigate effects caused by inhomogeneous distribution of the emitting particles along the loop. It is found that the effect of the adopted moderate electron anisotropy is the most pronounced near the footpoints and it also depends strongly on the loop orientation. Concentration of the emitting particles at the looptop results in a corresponding spatial shift of the radio brightness peak, thus reducing effects of the anisotropy. The high-frequency ({approx}> 50 GHz) emission spectral index is specified mainly by the energy spectrum of the emitting electrons; however, at intermediate frequencies (around 10-20 GHz), the spectrum shape is strongly dependent on the electron anisotropy, spatial distribution, and magnetic field nonuniformity. The implications of the obtained results for the diagnostics of the energetic electrons in solar flares are discussed.

Kuznetsov, Alexey A. [Armagh Observatory, Armagh BT61 9DG (United Kingdom); Nita, Gelu M.; Fleishman, Gregory D. [Center for Solar-Terrestrial Research, New Jersey Institute of Technology, Newark, NJ 07102 (United States)

2011-12-01T23:59:59.000Z

374

Investigations on loop antenna excited whistler waves in a cylindrical plasma based on laboratory experiments and simulations  

Science Conference Proceedings (OSTI)

Experimental investigations and simulations of loop antenna excited whistler waves in a cylindrical low temperature plasma are presented. Experiments are performed in the VINETA [Franck et al., Plasma Sources Sci. Technol. 14, 226 (2005)] device and simulations are generated using IPF-FD3D [C. Lechte, IEEE Trans. Plasma Sci. 37, 1099 (2009)], an implementation of the Yee-algorithm. A good agreement of the experiment and the simulation is found. The simulation is used to predict the spatial structure of the wave, the dominant source of the electric field, the relative contribution of electron, and displacement current as well as parallel and perpendicular currents to the magnetic field of the wave.

Pfannmoeller, J. P. [Max-Planck-Institut fuer Plasmaphysik, EURATOM Assoziation, Greifswald (Germany); Lechte, C. [Institut fuer Plasmaforschung, Stuttgart (Germany); Grulke, O.; Klinger, T. [Max-Planck-Institut fuer Plasmaphysik, EURATOM Assoziation, Greifswald (Germany); Ernst-Moritz-Arndt Universitaet, Greifswald (Germany)

2012-10-15T23:59:59.000Z

375

Enclosed ground-flare incinerator  

DOE Patents (OSTI)

An improved ground flare is provided comprising a stack, two or more burner assemblies, and a servicing port so that some of the burner assemblies can be serviced while others remain in operation. The burner assemblies comprise a burner conduit and nozzles which are individually fitted to the stack's burner chamber and are each removably supported in the chamber. Each burner conduit is sealed to and sandwiched between a waste gas inlet port and a matching a closure port on the other side of the stack. The closure port can be opened for physically releasing the burner conduit and supplying sufficient axial movement room for extracting the conduit from the socket, thereby releasing the conduit for hand removal through a servicing port. Preferably, the lower end of the stack is formed of one or more axially displaced lower tubular shells which are concentrically spaced for forming annular inlets for admitting combustion air. An upper tubular exhaust stack, similarly formed, admits additional combustion air for increasing the efficiency of combustion, increasing the flow of exhausted for improved atmospheric dispersion and for cooling the upper stack.

Wiseman, Thomas R. (Calgary, CA)

2000-01-01T23:59:59.000Z

376

rf improvements for Spallation Neutron Source H ion source  

Science Conference Proceedings (OSTI)

The Spallation Neutron Source at Oak Ridge National Laboratory is ramping up the accelerated proton beam power to 1.4 MW and just reached 1 MW. The rf-driven multicusp ion source that originates from the Lawrence Berkeley National Laboratory has been delivering 38 mA H beam in the linac at 60 Hz, 0.9 ms. To improve availability, a rf-driven external antenna multicusp ion source with a water-cooled ceramic aluminum nitride AlN plasma chamber is developed. Computer modeling and simulations have been made to analyze and optimize the rf performance of the new ion source. Operational statistics and test runs with up to 56 mA medium energy beam transport beam current identify the 2 MHz rf system as a limiting factor in the system availability and beam production. Plasma ignition system is under development by using a separate 13 MHz system. To improve the availability of the rf power system with easier maintenance, we tested a 70 kV isolation transformer for the 80 kW, 6% duty cycle 2 MHz amplifier to power the ion source from a grounded solid-state amplifier. 2010 American Institute of Physics.

Kang, Yoon W [ORNL; Fuja, Raymond E [ORNL; Goulding, Richard Howell [ORNL; Hardek, Thomas W [ORNL; Lee, Sung-Woo [ORNL; McCarthy, Mike [ORNL; Piller, Chip [ORNL; Shin, Ki [ORNL; Stockli, Martin P [ORNL; Welton, Robert F [ORNL

2010-01-01T23:59:59.000Z

377

Advanced Neutron Source (ANS) Project. Progress report FY 1993  

Science Conference Proceedings (OSTI)

This report covers the progress made in 1993 in the following sections: (1) project management; (2) research and development; (3) design and (4) safety. The section on research and development covers the following: (1) reactor core development; (2) fuel development; (3) corrosion loop tests and analysis; (4) thermal-hydraulic loop tests; (5) reactor control and shutdown concepts; (6) critical and subcritical experiments; (7) material data, structure tests, and analysis; (8) cold source development; (9) beam tube, guide, and instrument development; (10) neutron transport and shielding; (11) I and C research and development; and (12) facility concepts.

Campbell, J.H. [ed.; Selby, D.L.; Harrington, R.M. [Oak Ridge National Lab., TN (United States); Thompson, P.B. [Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States). Engineering Div.

1994-01-01T23:59:59.000Z

378

Synthesizing Transformations for Locality Enhancement of Imperfectly-Nested Loop Nests  

Science Conference Proceedings (OSTI)

Linear loop transformations and tiling are known to be very effective for enhancing locality of reference in perfectly-nested loops. However, they cannot be applied directly to imperfectly-nested loops. Some compilers attempt to convert imperfectly-nested ... Keywords: automatic locality enhancement, caches, imperfectly-nested loops, program transformation, restructuring compilers

Nawaaz Ahmed; Nikolay Mateev; Keshav Pingali

2001-10-01T23:59:59.000Z

379

Design and analysis of a second order phase locked loops (PLLs)  

Science Conference Proceedings (OSTI)

This work concerns with the design and analysis of phase locked loops (PLLs). In the last decade a lot of works have been done about the analysis of PLLs. The phase locked loops are analyzed briefly, second order, third order, and fourth order. In practically ... Keywords: charge pump PLL (CPPPL), loop filter (LF), phase locked loop (PLL)

Diary R. Sulaiman

2006-05-01T23:59:59.000Z

380

Micro-Columnated Loop Heat Pipe: The Future of Electronic Substrates  

E-Print Network (OSTI)

Loop Heat Pipes . . . . . . . . . . . . . . . . . . . .Heat Pipes . . . . . . . . . . . . . . . . . . . . . . . .of operation of a heat pipe [13]. . . . . . . . . . . . . .

Dhillon, Navdeep Singh

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Loop Current, Rings and Related Circulation in the Gulf of Mexico: A Review of Numerical  

E-Print Network (OSTI)

3 Loop Current, Rings and Related Circulation in the Gulf of Mexico: A Review of Numerical Models of the most energetic components of the circulation in the Gulf of Mexico: the Loop Current and Loop Current the observable features of the Loop Current and rings." The Gulf of Mexico is a semi-enclosed sea that con- nects

Ezer,Tal

382

An exercise in forecasting loop current and eddy frontal positions in the Gulf of Mexico  

E-Print Network (OSTI)

An exercise in forecasting loop current and eddy frontal positions in the Gulf of Mexico L.-Y. Oey to forecast Loop Current and Loop Current eddy frontal positions in the Gulf of Mexico, the Princeton Regional (2005), An exercise in forecasting loop current and eddy frontal positions in the Gulf of Mexico

383

Radiation source  

DOE Patents (OSTI)

A device and method for relativistic electron beam heating of a high-density plasma in a small localized region. A relativistic electron beam generator or accelerator produces a high-voltage electron beam which propagates along a vacuum drift tube and is modulated to initiate electron bunching within the beam. The beam is then directed through a low-density gas chamber which provides isolation between the vacuum modulator and the relativistic electron beam target. The relativistic beam is then applied to a high-density target plasma which typically comprises DT, DD, or similar thermonuclear gas at a density of 10.sup.17 to 10.sup.20 electrons per cubic centimeter. The target gas is ionized prior to application of the relativistic electron beam by means of a laser or other preionization source to form a plasma. Utilizing a relativistic electron beam with an individual particle energy exceeding 3 MeV, classical scattering by relativistic electrons passing through isolation foils is negligible. As a result, relativistic streaming instabilities are initiated within the high-density target plasma causing the relativistic electron beam to efficiently deposit its energy into a small localized region of the high-density plasma target.

Thode, Lester E. (Los Alamos, NM)

1981-01-01T23:59:59.000Z

384

Design Ground Snow Loads for Ohio  

Science Conference Proceedings (OSTI)

The weight of snow with a mean recurrence interval of 50 years, called the design ground snow load, is used by engineers and planners to estimate the weight of snow that roofs must be designed to support National maps of ground snow load have ...

Thomas W. Schmidlin; Dennis J. Edgell; Molly A. Delaney

1992-06-01T23:59:59.000Z

385

Parameterizing a Groundness Analysis of Logic Programs  

Science Conference Proceedings (OSTI)

We present a parametric groundness analysis whose input and output are parameterized by a set of groundness parameters. The result of the analysis can be instantiated for different uses of the program. It can also be used to derive sufficient conditions ...

Lunjin Lu

2001-07-01T23:59:59.000Z

386

Sharing and groundness dependencies in logic programs  

Science Conference Proceedings (OSTI)

We investigate Jacobs and Langen's Sharing domain, introduced for the analysis of variable sharing in logic programs, and show that it is isomorphic to Marriott and Sřndergaard's Pos domain, introduced for the analysis of groundness dependencies. ... Keywords: Boolean functions, abstract interpretation, dataflow analysis, global analysis, groundness analysis, program analysis, sharing analysis

Michael Codish; Harald Sřndergaard; Peter J. Stuckey

1999-09-01T23:59:59.000Z

387

Interim site characterization report and ground-water monitoring program for the Hanford site solid waste landfill  

SciTech Connect

Federal and state regulations governing the operation of landfills require utilization of ground-water monitoring systems to determine whether or not landfill operations impact ground water at the point of compliance (ground water beneath the perimeter of the facility). A detection-level ground-water monitoring system was designed, installed, and initiated at the Hanford Site Solid Waste Landfill (SWL). Chlorinated hydrocarbons were detected at the beginning of the ground-water monitoring program and continue to be detected more than 1 year later. The most probable source of the chlorinated hydrocarbons is washwater discharged to the SWL between 1985 and 1987. This is an interim report and includes data from the characterization work that was performed during well installation in 1987, such as field observations, sediment studies, and geophysical logging results, and data from analyses of ground-water samples collected in 1987 and 1988, such as field parameter measurements and chemical analyses. 38 refs., 27 figs., 8 tabs.

Fruland, R.M.; Hagan, R.A.; Cline, C.S.; Bates, D.J.; Evans, J.C.; Aaberg, R.L.

1989-07-01T23:59:59.000Z

388

Little Climates -- Weather Just Above The Ground  

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

Weather Just Above The Ground Weather Just Above The Ground Nature Bulletin No. 481-A February 17, 1973 Forest Preserve District of Cook County George W, Dunne, President Roland F. Eisenbeis, Supt. of Conservation LITTLE CLIMATES -- Weather Just Above the Ground In a previous bulletin we talked about little climates, underground, resulting from weather conditions in the soil. Just above the ground there is another "little climate" equally important. We frequently see evidences of it without realizing how and why they were produced. Just above the earth, there lies a narrow layer of changeable weather that is affected at both surfaces by its mighty neighbors: the land below and the restless air in the atmosphere above it. Under the spell of gravity, it clings to the ground in spite of all but the swiftest winds. In this layer there are special weather conditions overlooked by nearly everyone.

389

Understanding broadcast based peer review on open source software projects  

Science Conference Proceedings (OSTI)

Software peer review has proven to be a successful technique in open source software (OSS) development. In contrast to industry, where reviews are typically assigned to specific individuals, changes are broadcast to hundreds of potentially interested ... Keywords: case studies, grounded theory, open source software, peer review

Peter C. Rigby; Margaret-Anne Storey

2011-05-01T23:59:59.000Z

390

NETL: Alstom's Chemical Looping Combustion Technology with CO2 Capture  

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

Alstom's Chemical Looping Combustion Technology with CO2 Capture for New and Existing Coal-Fired Power Plants Alstom's Chemical Looping Combustion Technology with CO2 Capture for New and Existing Coal-Fired Power Plants Project No.: DE-FE0009484 Alstom is advancing the development of Limestone Chemical Looping Combustion (LCL-C(tm)) technology. Chemical looping has no direct contact between air and fuel. The looping process usually utilizes oxygen from a metal carrier, but in this case, limestone is used. Economic evaluations will be made of four LCL-C plant configurations. The base configuration plant has already been completed and will be updated from previous reports. A second case will compare the effects of designing the reducer reactor using CFB sizing standards. A third case will investigate the effects of using a pressurized reducer reactor. Pressurizing the reducer reduces the reactor size and reduces the amount of compression required for the CO2 outlet gas stream. A fourth case will investigate the use of an advanced ultra-supercritical (USC) steam cycle. The advanced USC steam cycle should increase overall plant efficiency and lower the cost of electricity. Mass and energy balances will be done for each case. The four LCL-CTM cases will be compared against a supercritical pulverized coal-fired plant without CO2 capture.

391

Topological interactions between ring polymers: Implications for chromatin loops  

E-Print Network (OSTI)

Chromatin looping is a major epigenetic regulatory mechanism in higher eukaryotes. Besides its role in transcriptional regulation, chromatin loops have been proposed to play a pivotal role in the segregation of entire chromosomes. The detailed topological and entropic forces between loops still remain elusive. Here, we quantitatively determine the potential of mean force between the centers of mass of two ring polymers, i.e. loops. We find that the transition from a linear to a ring polymer induces a strong increase in the entropic repulsion between these two polymers. On top, topological interactions such as the non-catenation constraint further reduce the number of accessible conformations of close-by ring polymers by about 50%, resulting in an additional effective repulsion. Furthermore, the transition from linear to ring polymers displays changes in the conformational and structural properties of the system. In fact, ring polymers adopt a markedly more ordered and aligned state than linear ones. The forces and accompanying changes in shape and alignment between ring polymers suggest an important regulatory function of such a topology in biopolymers. We conjecture that dynamic loop formation in chromatin might act as a versatile control mechanism regulating and maintaining different local states of compaction and order.

Manfred Bohn; Dieter W. Heermann

2010-01-24T23:59:59.000Z

392

Electroweak Constraints on the Fourth Generation at Two Loop Order  

E-Print Network (OSTI)

If the Higgs-like particle at 126 GeV is the standard model Higgs boson, then SM4, the simplest four generation extension of the SM, is inconsistent with the most recent LHC data. However, 4G variations (BSM4) are possible if the new particle is not the SM Higgs boson and/or if other new quanta modify its production and decay rates. Since LHC searches have pushed 4G quarks to high mass and strong coupling where perturbation theory eventually fails, we examine the leading nondecoupling EW (electroweak) corrections at two loop order to estimate the domain of validity for perturbation theory. We find that the two loop hypercharge correction, which has not been included in previous EW fits of 4G models, makes the largest quark sector contribution to the rho parameter, much larger even than the nominally leading one loop term. Because it is large and negative, it has a big effect on the EW fits. It does not invalidate perturbation theory since it only first appears at two loop order and is large because it does not vanish for equal quark doublet masses, unlike the one loop term. We estimate that perturbation theory is useful for $m_Q\\simeq 600$ GeV but begins to become marginal for $m_Q\\, \\gtap\\, 900$ GeV. The results apply directly to BSM4 models that retain the SM Higgs sector but must be re-evaluated for non-SM Higgs sectors.

Michael S. Chanowitz

2012-12-13T23:59:59.000Z

393

CNCC Craig Campus Geothermal Program: 82-well closed loop GHP...  

Open Energy Info (EERE)

campus. The primary component in this campus approach is the common GHP well field ground heat exchanger (GHEX). The innovative design of the shared well field will demonstrate...

394

Inductance and near fields of a loop antenna in a cold magnetoplasma in the whistler frequency band  

SciTech Connect

The influence of a magnetoplasma on the inductance of a circular loop antenna oriented perpendicular to the ambient static magnetic field and operated in the whistler frequency band is studied. Based on a strict electrodynamic approach, the analytical treatment of the antenna reactance is performed for a uniform rf current distribution along the antenna wire. Calculations are made for plasma parameters and operating frequencies typical for active ionospheric experiments and laboratory rf (helicon) sources of dense magnetized plasmas. It is shown that the plasma influence on the inductance of the loop antenna remains relatively weak, even for antennas with dimensions close to half of the longitudinal whistler wavelength, when the rf field distribution in the antenna near zone is strongly different from that in vacuum. The theoretical predictions are confirmed by measurements performed on the large KROT plasma device. The results obtained are of crucial importance for the preparation of active ionospheric experiments and for the matching of loop antennas used in laboratory rf sources of dense magnetized plasmas.

Gushchin, M. E.; Korobkov, S. V.; Kostrov, A. V. [Institute of Applied Physics, 603950 Nizhny Novgorod (Russian Federation); Zaboronkova, T. M. [Department of Applied Physics, Technical University of Nizhny Novgorod, 603950 Nizhny Novgorod (Russian Federation); Krafft, C. [Laboratoire de Physique des Plasmas, Ecole Polytechnique, 91128 Palaiseau Cedex, Univ. Paris Sud, 91405 Orsay Cedex (France)

2012-09-15T23:59:59.000Z

395

LANL breaks ground on key sediment control project  

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

Sediment control project Sediment control project LANL breaks ground on key sediment control project Called "grade-control" structures, the approximately $2 million features are up to eight feet high and made of rocks packed tightly into wire enclosures. November 5, 2009 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials.

396

Ground vibration model studies for APS storage ring  

SciTech Connect

An analytical ground vibration model is developed for study of the vibration effects on the beam motion in the Advanced Photon Source (APS) storage ring. The different physical parameters associated with the wave characteristics and the vibration modes needed for the study are taken from the vibration studies carried out at the APS site. The implementation has been carried out using Mathematica{trademark}. The study is carried out for the frequency range 1--35 Hz, with a number of sources changing from one through ten. The program written in Mathematica{trademark}, calculates orbit distortion, beta wave change, tune change, dispersion change, and chromaticity change. However, the main parameter studied for the APS storage ring has been the orbit distortion. The merit factor associated with different modes excited by the vibrations has been calculated.

Koul, R.K.

1994-07-01T23:59:59.000Z

397

Rebuilding After Disaster: Going Green from the Ground Up | Open Energy  

Open Energy Info (EERE)

After Disaster: Going Green from the Ground Up After Disaster: Going Green from the Ground Up Jump to: navigation, search Name Rebuilding After Disaster: Going Green from the Ground Up Agency/Company /Organization National Renewable Energy Laboratory Focus Area Buildings, Economic Development, Energy Efficiency, People and Policy, Transportation, Water Conservation, Renewable Energy, Biomass, Geothermal, Ground Source Heat Pumps, Solar, - Solar Hot Water, - Solar Pv, Biomass - Waste To Energy, Wind Phase Bring the Right People Together, Create a Vision, Determine Baseline, Evaluate Options, Develop Goals, Prepare a Plan, Get Feedback, Develop Finance and Implement Projects, Create Early Successes Resource Type Case studies/examples Availability Publicly available--Free Publication Date 10/1/2009

398

Energy Savings Calculator for Commercial Boilers: Closed Loop, Space  

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

Savings Calculator for Commercial Boilers: Closed Loop, Savings Calculator for Commercial Boilers: Closed Loop, Space Heating Applications Only Energy Savings Calculator for Commercial Boilers: Closed Loop, Space Heating Applications Only October 8, 2013 - 2:23pm Addthis This cost calculator is a screening tool that estimates a product's lifetime energy cost savings at various efficiency levels. Learn more about the base model and other assumptions. Project Type Is this a new installation or a replacement? New Replacement What is the deliverable fluid type? Water Steam What fuel is used? Gas Oil How many boilers will you purchase? unit(s) Performance Factors Existing What is the capacity of the existing boiler? MBtu/hr* What is the thermal efficiency of the existing boiler? % Et New What is the capacity of the new boiler?

399

Belgium east loop active network management (Smart Grid Project) | Open  

Open Energy Info (EERE)

Belgium east loop active network management (Smart Grid Project) Belgium east loop active network management (Smart Grid Project) Jump to: navigation, search Project Name Belgium east loop active network management Country Belgium Coordinates 50.148746°, 4.086914° 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":50.148746,"lon":4.086914,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

400

Quasi-Local Energy in Loop Quantum Gravity  

E-Print Network (OSTI)

Although there is no known meaningful notion of the energy density of the gravitational field in general relativity, a few notions of quasi-local energy of gravity associated to extended but finite domains have been proposed. In this paper, the notions of quasi-local energy are studied in the framework of loop quantum gravity, in order to see whether these notions can be carried out at quantum level. Two basic quasi-local geometric quantities are quantized, which lead to well-defined operators in the kinematical Hilbert space of loop quantum gravity. We then use them as basic building blocks to construct different versions of quasi-local energy operators. The operators corresponding to Brown-York energy, Liu-Yau energy, Hawking energy, and Geroch energy are obtained respectively. The virtue of the Geroch energy operator is beneficial for us to derive a rather general entropy-area relation and thus a holographic principle from loop quantum gravity.

Jinsong Yang; Yongge Ma

2008-12-18T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Quasi-Local Energy in Loop Quantum Gravity  

E-Print Network (OSTI)

Although there is no known meaningful notion of the energy density of the gravitational field in general relativity, a few notions of quasi-local energy of gravity associated to extended but finite domains have been proposed. In this paper, the notions of quasi-local energy are studied in the framework of loop quantum gravity, in order to see whether these notions can be carried out at quantum level. Two basic quasi-local geometric quantities are quantized, which lead to well-defined operators in the kinematical Hilbert space of loop quantum gravity. We then use them as basic building blocks to construct different versions of quasi-local energy operators. The operators corresponding to Brown-York energy, Liu-Yau energy, Hawking energy, and Geroch energy are obtained respectively. The virtue of the Geroch energy operator is beneficial for us to derive a rather general entropy-area relation from loop quantum gravity.

Yang, Jinsong

2008-01-01T23:59:59.000Z

402

Multi-loop Feynman integrals and conformal quantum mechanics  

E-Print Network (OSTI)

New algebraic approach to analytical calculations of D-dimensional integrals for multi-loop Feynman diagrams is proposed. We show that the known analytical methods of evaluation of multi-loop Feynman integrals, such as integration by parts and star-triangle relation methods, can be drastically simplified by using this algebraic approach. To demonstrate the advantages of the algebraic method of analytical evaluation of multi-loop Feynman diagrams, we calculate ladder diagrams for the massless $\\phi^3$ theory. Using our algebraic approach we show that the problem of evaluation of special classes of Feynman diagrams reduces to the calculation of the Green functions for specific quantum mechanical problems. In particular, the integrals for ladder massless diagrams in the $\\phi^3$ scalar field theory are given by the Green function for the conformal quantum mechanics.

A. P. Isaev

2003-03-06T23:59:59.000Z

403

Novel Reactor Design for Solid Fuel Chemical Looping Combustion  

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

Novel Reactor Design for Solid Fuel Novel Reactor Design for Solid Fuel Chemical Looping Combustion Opportunity Research is active on the patent pending technology, titled "Apparatus and Method for Solid Fuel Chemical Looping Combustion." This technology is available for licensing and/or further collaborative research from the U.S. Department of Energy's National Energy Technology Laboratory. Overview The removal of CO2 from power plants is challenging because existing methods to separate CO2 from the gas mixture requires a significant fraction of the power plant output. Chemical-looping combustion (CLC) is a novel technology that utilizes a metal oxide oxygen carrier to transport oxygen to the fuel thereby avoiding direct contact between fuel and air. The use of CLC has the advantages of reducing the energy penalty while

404

Ground Gravity Survey At Lightning Dock Area (Warpinski, Et Al., 2002) |  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Ground Gravity Survey At Lightning Dock Area (Warpinski, Et Al., 2002) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Ground Gravity Survey At Lightning Dock Area (Warpinski, Et Al., 2002) Exploration Activity Details Location Lightning Dock Area Exploration Technique Ground Gravity Survey Activity Date Usefulness not indicated DOE-funding Unknown Notes As a foundation for successful siting and drilling a deep test well, additional geophysical work has been completed including gravity, resistivity, and airborne magnetic surveys. Several new seismic profiles

405

Definition: Ground Electromagnetic Techniques | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Ground Electromagnetic Techniques Jump to: navigation, search Dictionary.png Ground Electromagnetic Techniques Ground electromagnetic techniques measure electromagnetic fields in order to determine subsurface electrical resistivity with the earth surface as the observation point.[1] View on Wikipedia Wikipedia Definition The electromagnetic force is one of the four fundamental interactions in nature, the other three being the strong interaction, the weak interaction, and gravitation. This force is described by electromagnetic fields, and has innumerable physical instances including the interaction of electrically charged particles and the interaction of uncharged magnetic force fields with electrical conductors. The word

406

Ground Electromagnetic Techniques | Open Energy Information  

Open Energy Info (EERE)

Ground Electromagnetic Techniques Ground Electromagnetic Techniques Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Ground Electromagnetic Techniques Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Electromagnetic Techniques Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water Thermal: Resistivity influenced by temperature Dictionary.png

407

From Classical To Quantum Gravity: Introduction to Loop Quantum Gravity  

E-Print Network (OSTI)

We present an introduction to the canonical quantization of gravity performed in loop quantum gravity, based on lectures held at the 3rd quantum geometry and quantum gravity school in Zakopane in 2011. A special feature of this introduction is the inclusion of new proposals for coupling matter to gravity that can be used to deparametrize the theory, thus making its dynamics more tractable. The classical and quantum aspects of these new proposals are explained alongside the standard quantization of vacuum general relativity in loop quantum gravity.

Giesel, Kristina

2012-01-01T23:59:59.000Z

408

Gravity quantized: Loop quantum gravity with a scalar field  

Science Conference Proceedings (OSTI)

...''but we do not have quantum gravity.'' This phrase is often used when analysis of a physical problem enters the regime in which quantum gravity effects should be taken into account. In fact, there are several models of the gravitational field coupled to (scalar) fields for which the quantization procedure can be completed using loop quantum gravity techniques. The model we present in this paper consists of the gravitational field coupled to a scalar field. The result has similar structure to the loop quantum cosmology models, except that it involves all the local degrees of freedom of the gravitational field because no symmetry reduction has been performed at the classical level.

Domagala, Marcin; Kaminski, Wojciech [Instytut Fizyki Teoretycznej, Uniwersytet Warszawski, ul. Hoza 69, 00-681 Warszawa (Warsaw), Polska (Poland) (Poland); Giesel, Kristina [Excellence Cluster Universe, Technische Universitaet Muenchen, Boltzmannstrasse 2, 85748 Garching (Germany); Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803 (United States); Lewandowski, Jerzy [Instytut Fizyki Teoretycznej, Uniwersytet Warszawski, ul. Hoza 69, 00-681 Warszawa (Warsaw), Polska (Poland) (Poland); Institute for Gravitation and the Cosmos, Physics Department, Penn State, University Park, Pennsylvania 16802 (United States)

2010-11-15T23:59:59.000Z

409

Dilaton Gravity, Poisson Sigma Models and Loop Quantum Gravity  

E-Print Network (OSTI)

Spherically symmetric gravity in Ashtekar variables coupled to Yang-Mills theory in two dimensions and its relation to dilaton gravity and Poisson sigma models are discussed. After introducing its loop quantization, quantum corrections for inverse triad components are shown to provide a consistent deformation without anomalies. The relation to Poisson sigma models provides a covariant action principle of the quantum corrected theory with effective couplings. Results are also used to provide loop quantizations of spherically symmetric models in arbitrary D space-time dimensions.

Martin Bojowald; Juan D. Reyes

2008-10-28T23:59:59.000Z

410

Source Selection | Department of Energy  

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

Source Selection Source Selection Source SelectionSource Selection Boards Source Evaluation Board (SEB) Monthly Status Reporting Requirement (pdf) Source Evaluation Board (SEB)...

411

Grounded Renewable Energy | Open Energy Information  

Open Energy Info (EERE)

Grounded Renewable Energy Grounded Renewable Energy Jump to: navigation, search Name Grounded Renewable Energy Place Carbondale, Colorado Zip 81623 Sector Renewable Energy, Solar Product Grounded Renewable Energy designs turn-key solar systems for homes and businesses in Colorado. Coordinates 41.573959°, -75.501361° 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":41.573959,"lon":-75.501361,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

412

Earthquake ground motion modeling on parallel computers  

Science Conference Proceedings (OSTI)

We describe the design and discuss the performance of a parallel elastic wave propagation simulator that is being used to model and study earthquake-induced ground motion in large sedimentary basins. The components of the system include mesh generators, ...

Hesheng Bao; Jacobo Bielak; Omar Ghattas; Loukas F. Kallivokas; David R. O'Hallaron; Jonathan R. Shewchuk; Jifeng Xu

1996-11-01T23:59:59.000Z

413

Solid waste burial grounds interim safety analysis  

SciTech Connect

This Interim Safety Analysis document supports the authorization basis for the interim operation and restrictions on interim operations for the near-surface land disposal of solid waste in the Solid Waste Burial Grounds. The Solid Waste Burial Grounds Interim Safety Basis supports the upgrade progress for the safety analysis report and the technical safety requirements for the operations in the Solid Waste Burial Grounds. Accident safety analysis scenarios have been analyzed based on the significant events identified in the preliminary hazards analysis. The interim safety analysis provides an evaluation of the operations in the Solid Waste Burial Grounds to determine if the radiological and hazardous material exposures will be acceptable from an overall health and safety standpoint to the worker, the onsite personnel, the public, and the environment.

Saito, G.H.

1994-10-01T23:59:59.000Z

414

Embodied object schemas for grounding language use  

E-Print Network (OSTI)

This thesis presents the Object Schema Model (OSM) for grounded language interaction. Dynamic representations of objects are used as the central point of coordination between actions, sensations, planning, and language ...

Hsiao, Kai-yuh, 1977-

2007-01-01T23:59:59.000Z

415

Grounding linguistic analysis in control applications  

E-Print Network (OSTI)

This thesis addresses the problem of grounding linguistic analysis in control applications, such as automated maintenance of computers and game playing. We assume access to natural language documents that describe the ...

Branavan, Satchuthananthavale Rasiah Kuhan

2012-01-01T23:59:59.000Z

416

Ground Clutter Canceling with a Regression Filter  

Science Conference Proceedings (OSTI)

This paper explores ground clutter filtering with a class of cancelers that use regression. Regression filters perform this task in a simple manner, resulting in similar or better performance than the fifth-order elliptic filter implemented in ...

Sebastián M. Torres; Dusan S. Zrnic

1999-10-01T23:59:59.000Z

417

Commonality of ground systems in launch operations  

E-Print Network (OSTI)

NASA is examining the utility of requiring a certain degree of commonality in both flight and ground systems in the Constellation Program. While the benefits of commonality seem obvious in terms of minimizing upfront ...

Quinn, Shawn M

2008-01-01T23:59:59.000Z

418

The Generation of Coronal Loop Waves below the Photosphere by p-Mode Forcing  

E-Print Network (OSTI)

Recent observations of coronal-loop waves by TRACE and within the corona as a whole by CoMP clearly indicate that the dominant oscillation period is 5 minutes, thus implicating the solar p modes as a possible source. We investigate the generation of tube waves within the solar convection zone by the buffeting of p modes. The tube waves--in the form of longitudinal sausage waves and transverse kink waves--are generated on the many magnetic fibrils that lace the convection zone and pierce the solar photosphere. Once generated by p-mode forcing, the tube waves freely propagate up and down the tubes, since the tubes act like light fibers and form a waveguide for these magnetosonic waves. Those waves that propagate upward pass through the photosphere and enter the upper atmosphere where they can be measured as loop oscillations and other forms of propagating coronal waves. We treat the magnetic fibrils as vertically aligned, thin flux tubes and compute the energy flux of tube waves that can generated and driven into the upper atmosphere. We find that a flux in excess of 10^5 ergs/cm^2/s can be produced, easily supplying enough wave energy to explain the observations. Furthermore, we compute the associated damping rate of the driving p modes and find that the damping is significant compared to observed line widths only for the lowest order p modes.

Bradley W. Hindman; Rekha Jain

2008-05-13T23:59:59.000Z

419

Grounding and Lightning Protection of Capacitor Controllers  

Science Conference Proceedings (OSTI)

This is the third report in EPRI's capacitor reliability study. It deals with capacitor controller grounding and lightning protection. Prior reports dealt with nuisance fuse operations, operating and construction practices, and use of distribution line capacitors for transmission voltage support. Simulations were performed to investigate various controller mounting locations and grounding configurations and their impact on the magnitude of surges reaching the controller. Once these aspects of capacitor c...

2005-03-08T23:59:59.000Z

420

Ground Penetrating Imaging Radar Phase II  

Science Conference Proceedings (OSTI)

EPRI project "Ground Penetrating Imaging Radar Phase II," also called the "GPiR Project," started in August 1998 at Schlumberger-Doll Research, a division of Schlumberger Technology Corporation. Its goal was to determine if modern ground-penetrating radar (GPR) could make three-dimensional (3D) images of buried utility lines accurate and detailed enough to help utility companies better manage their underground infrastructure. Work began with a comparison of commercial and prototype GPR systems in the lab...

2001-06-20T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Silica precipitation and scaling in a dynamic loop system. [Design and testing of titanium corrosion test loop  

DOE Green Energy (OSTI)

A titanium corrosion test loop was modified to provide a dynamic facility for studying the formation of silica precipitates and scale from simulated geothermal brines as a function of composition, temperature, and flow conditions. A schematic of the modified loop system is presented. The principal components and connecting piping are all constructed of commercially pure titanium. These components include a centrifugal pump, silica saturator column, segmented heat exchanger, reheat heat exchanger, and a high pressure feed pump (stainless steel). The system is designed to circulate simulated geothermal brines saturated with silica to approximately 300/sup 0/C for study of silica scaling. Data obtained from a test run are included. (JGB)

Bohlmann, E.G.; Shor, A.J.; Berlinski, P.

1977-01-01T23:59:59.000Z

422

Ground water protection management program plan  

SciTech Connect

U.S. Department of Energy (DOE) Order 5400.1 requires the establishment of a ground water protection management program to ensure compliance with DOE requirements and applicable federal, state, and local laws and regulations. The Uranium Mill Tailings Remedial Action (UMTRA) Project Office was prepared this Ground Water Protection Management Program Plan (ground water protection plan) whose scope and detail reflect the program`s significance and address the seven activities required in DOE Order 5400.1, Chapter III, for special program planning. This ground water protection plan highlights the methods designed to preserve, protect, and monitor ground water resources at UMTRA Project processing and disposal sites. The plan includes an overview of the remedial action status at the 24 designated processing sites and identifies technical guidance documents and site-specific documents for the UMTRA Project ground water protection management program. In addition, the plan addresses the general information required to develop a water resources protection strategy at the permanent disposal sites. Finally, the plan describes ongoing activities that are in various stages of development at UMTRA Project sites.

Not Available

1994-02-01T23:59:59.000Z

423

Closed Loop Test Facility for hot dirty gas valves  

SciTech Connect

A design study of a closed loop test facility for eight-inch hot dirty gas valves is presented. The objective of the facility is to quality valves for use in coal gasifiers, combined cycle plants, and pressurized fluid bed combustors. Outline sketches and estimated costs are presented for the selected design.

Not Available

1980-02-06T23:59:59.000Z

424

Ideal kink instability of a magnetic loop equilibrium  

E-Print Network (OSTI)

The force-free coronal loop model by Titov & D\\'emoulin (1999} is found to be unstable with respect to the ideal kink mode, which suggests this instability as a mechanism for the initiation of flares. The long-wavelength ($m=1$) mode grows for average twists $\\Phi\\ga3.5\\pi$ (at a loop aspect ratio of $\\approx$ 5). The threshold of instability increases with increasing major loop radius, primarily because the aspect ratio then also increases. Numerically obtained equilibria at subcritical twist are very close to the approximate analytical equilibrium; they do not show indications of sigmoidal shape. The growth of kink perturbations is eventually slowed down by the surrounding potential field, which varies only slowly with radius in the model. With this field a global eruption is not obtained in the ideal MHD limit. Kink perturbations with a rising loop apex lead to the formation of a vertical current sheet below the apex, which does not occur in the cylindrical approximation.

T. Toeroek; B. Kliem; V. S. Titov

2003-11-09T23:59:59.000Z

425

Why Can Wind Delay the Shedding of Loop Current Eddies?  

Science Conference Proceedings (OSTI)

It is first shown that wind in the Gulf of Mexico can delay the shedding of Loop Current eddies. A time-dependent, three-dimensional numerical experiment forced by a spatially and temporally constant westward wind stress within the Gulf is ...

Y.-L. Chang; L.-Y. Oey

2010-11-01T23:59:59.000Z

426

Discrete gravity models and Loop Quantum Gravity: a short review  

E-Print Network (OSTI)

We review the relation between loop quantum gravity on a fixed graph and discrete models of gravity. We compare Regge and twisted geometries, and discuss discrete actions based on twisted geometries and on the discretization of the Plebanski action. We discuss the role of discrete geometries in the spin foam formalism, with particular attention to the definition of the simplicity constraints.

Dupuis, Maite; Speziale, Simone

2012-01-01T23:59:59.000Z

427

LOOP ROUTE UCSC CAMPUS SHUTTLES Saturday Service Hours  

E-Print Network (OSTI)

Way Social Sciences 2 ChinquapinRoad MERRILL COLLEGE McLaughlin Drive East Field House Hagar Drive, Hagar Drive, McLaughlin Drive, Heller Drive, and Empire Grade/High Street. Barn Theater Loop Science & Engineering Library Steinhart W ay Social Sciences 2 ChinquapinRoad MERRILL COLLEGE McLaughlin

California at Santa Cruz, University of

428

Energy of string loops and thermodynamics of dark energy  

Science Conference Proceedings (OSTI)

We discuss the thermodynamic aspects of a simple model of cosmic string loops, whose energy is nonlinearly related to their lengths. We obtain in a direct way an equation of state having the form p=-(1+{alpha}){rho}/3, with {rho} the energy density and 1+{alpha} the exponent which relates the energy u{sub l} of a loop with its length l as u{sub l}{approx}l{sup 1+{alpha}}. In the linear situation ({alpha}=0) one has p=-{rho}/3, in the quadratic one ({alpha}=1) p=-2{rho}/3, and in the cubic case ({alpha}=2) p=-{rho}. For all values of {alpha} the entropy goes as S{approx}(2-{alpha})L{sup 3/2} (L being the string length density). The expression of S is useful to explore the behavior of such string loops under adiabatic expansion of the Universe. Thermodynamic stability suggests that the gas of string loops must coexist with several long strings, longer than the horizon radius.

Jou, D. [Departament de Fisica, Universitat Autonoma de Barcelona, 08193 Bellaterra, Catalonia (Spain); Mongiovi, M. S.; Sciacca, M. [Dipartimento di Metodi e Modelli Matematici, Universita di Palermo, Viale delle Scienze, 90128, Palermo (Italy)

2011-02-15T23:59:59.000Z

429

Water-Loop Heat Pump Systems: Volumes 1 and 2  

Science Conference Proceedings (OSTI)

Water-loop heat pump (WLHP) systems are reliable, versatile, energy-efficient alternatives to conventional systems such as packaged rooftop or central chiller systems. These systems offer low installed costs, unparalleled design flexibility, and an inherent ability to recover heat in a variety of commercial and multifamily residential buildings for both new construction and retrofit markets.

1993-04-01T23:59:59.000Z

430

Cerenkov's Effect and Neutrino Oscillations in Loop Quantum Gravity  

E-Print Network (OSTI)

Bounds on the scale parameter {\\cal L} arising in loop quantum gravity theory are derived in the framework of Cerenkov's effect and neutrino oscillations. Assuming that {\\cal L} is an universal constant, we infer {\\cal L}> 10^{-18}eV^{-1}, a bound compatible with ones inferred in different physical context.

G. Lambiase

2003-01-16T23:59:59.000Z

431

Loop Quantum Corrections to Statefinder Parameters of Dark Energy  

E-Print Network (OSTI)

In this short letter, we presented the explicit forms of the statefinder parameters for the Friedmann-Robertson-Walker (FRW) Universe in the loop quantum cosmology (LQC) for Holographic dark energy and New-Agegraphic dark energy. Numerically we investigated cosmological implications of these parameters for models of dark energy.

Jamil, Mubasher; Myrzakulov, Ratbay

2013-01-01T23:59:59.000Z

432

Loop Quantum Corrections to Statefinder Parameters of Dark Energy  

E-Print Network (OSTI)

In this short letter, we presented the explicit forms of the statefinder parameters for the Friedmann-Robertson-Walker (FRW) Universe in the loop quantum cosmology (LQC) for Holographic dark energy and New-Agegraphic dark energy. Numerically we investigated cosmological implications of these parameters for models of dark energy.

Mubasher Jamil; D. Momeni; Ratbay Myrzakulov

2013-05-17T23:59:59.000Z

433

A Mirnov loop array for field-reversed configurations  

SciTech Connect

An array of 64 magnetic pick-up loops has been used for stability studies of large field-reversed configurations in the FRX-C/LSM device. This array proved reliable, could resolve signals of a few Gauss, and allowed the detection of several plasma instabilities. 3 refs., 4 figs.

Tuszewski, M.

1990-01-01T23:59:59.000Z

434

Two-loop corrections to gluon fusion into two photons  

SciTech Connect

An overview of the calculation of the two-loop helicity amplitudes for scattering of two gluons into two photons is presented. These matrix elements enter into the recent improved calculation of the QCD background to Higgs boson decay into a pair of photons, which is the preferred search mode at the LHC for the case of a light Higgs boson.

Dixon, Lance

2002-12-20T23:59:59.000Z

435

Phase Locked Loop Control of Inverters in a Microgrid  

E-Print Network (OSTI)

Phase Locked Loop Control of Inverters in a Microgrid Matthew Surprenant Dept of ECE University Venkataramanan Dept of ECE University of Wisconsin Madison, WI, USA Abstract--Microgrids are small for inverter-based microsources within a mi- crogrid. The general control philosophy within a microgrid

Hiskens, Ian A.

436

Loop Current excursions and ring detachments during 1993–2009  

Science Conference Proceedings (OSTI)

Linkages between the variability of Loop Current LC surface dynamics, LC ring detachments, and the mean sea height anomaly in the Gulf of Mexico GOM are explored using a new methodology that locates the LC fronts and detects the shedding of LC rings. ...

David Lindo-Atichati, Francis Bringas, Gustavo Goni

2013-07-01T23:59:59.000Z

437

Polyhedral model based mapping optimization of loop nests for CGRAs  

Science Conference Proceedings (OSTI)

The coarse-grained reconfigurable architecture (CGRA) is a promising platform that provides both high performance and high power-efficiency. The compute-intensive portions of an application (e.g. loops) are often mapped onto CGRA for acceleration. To ...

Dajiang Liu, Shouyi Yin, Leibo Liu, Shaojun Wei

2013-05-01T23:59:59.000Z

438

Grounding Analysis in Heterogeneous Soil Models: Application to Underground Substations  

E-Print Network (OSTI)

Grounding Analysis in Heterogeneous Soil Models: Application to Underground Substations Ignasi in forthcoming publications. Keywords-grounding analysis; earthing analysis, underground substations; I to a river (at substations next to hydroelectric dams), or the grounding system of a buried electrical

Colominas, Ignasi

439

Extreme-UV electrical discharge source  

DOE Patents (OSTI)

An extreme ultraviolet and soft x-ray radiation electric capillary discharge source that includes a boron nitride housing defining a capillary bore that is positioned between two electrodes one of which is connected to a source of electric potential can generate a high EUV and soft x-ray radiation flux from the capillary bore outlet with minimal debris. The electrode that is positioned adjacent the capillary bore outlet is typically grounded. Pyrolytic boron nitride, highly oriented pyrolytic boron nitride, and cubic boron nitride are particularly suited. The boron nitride capillary bore can be configured as an insert that is encased in an exterior housing that is constructed of a thermally conductive material. Positioning the ground electrode sufficiently close to the capillary bore outlet also reduces bore erosion.

Fornaciari, Neal R. (Tracey, CA); Nygren, Richard E. (Los Ranchos de Albuquerque, NM); Ulrickson, Michael A. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

440

PHYSICAL PROPERTIES OF COOLING PLASMA IN QUIESCENT ACTIVE REGION LOOPS  

Science Conference Proceedings (OSTI)

In the present work, we use SOHO/SUMER, SOHO/UVCS, SOHO/EIT, SOHO/LASCO, STEREO/EUVI, and Hinode/EIS coordinated observations of an active region (AR 10989) at the west limb taken on 2008 April 8 to study the cooling of coronal loops. The cooling plasma is identified using the intensities of SUMER spectral lines emitted at temperatures in the 4.15 {EIS and SUMER spectral observations are used to measure the physical properties of the loops. We found that before cooling took place these loops were filled with coronal hole-like plasma, with temperatures in the 5.6 {<=} log T {<=} 5.9 range. SUMER spectra also allowed us to determine the plasma temperature, density, emission measure, element abundances, and dynamic status during the cooling process. The ability of EUVI to observe the emitting region from a different direction allowed us to measure the volume of the emitting region and estimate its emission measure. Comparison with values measured from line intensities provided us with an estimate of the filling factor. UVCS observations of the coronal emission above the active region showed no streamer structure associated with AR 10989 at position angles between 242{sup 0}and 253.{sup 0} EIT, LASCO, and EUVI-A narrowband images and UVCS spectral observations were used to discriminate between different scenarios and monitor the behavior of the active region in time. The present study provides the first detailed measurements of the physical properties of cooling loops, a very important benchmark for theoretical models of loop cooling and condensation.

Landi, E. [Artep, Inc. at Naval Research Laboratory, 4555 Overlook Ave. S.W., 20375-5320, Washington DC (United States); Miralles, M. P. [Harvard-Smithsonian Center for Astrophysics, 60 Garden St., MS-50, Cambridge, MA 02138 (United States); Curdt, W. [Max Planck Institut fuer Sonnensystemforschung, Max Planck Strasse 2, Katlenburg-Lindau 37191 (Germany); Hara, H. [National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588 (Japan)

2009-04-10T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

On the universality of some Smarandache loops of Bol-Moufang type  

E-Print Network (OSTI)

A Smarandache quasigroup(loop) is shown to be universal if all its f,g-principal isotopes are Smarandache f,g-principal isotopes. Also, weak Smarandache loops of Bol-Moufang type such as Smarandache: left(right) Bol, Moufang and extra loops are shown to be universal if all their f,g-principal isotopes are Smarandache f,g-principal isotopes. Conversely, it is shown that if these weak Smarandache loops of Bol-Moufang type are universal, then some autotopisms are true in the weak Smarandache sub-loops of the weak Smarandache loops of Bol-Moufang type relative to some Smarandache elements. Futhermore, a Smarandache left(right) inverse property loop in which all its f,g-principal isotopes are Smarandache f,g-principal isotopes is shown to be universal if and only if it is a Smarandache left(right) Bol loop in which all its f,g-principal isotopes are Smarandache f,g-principal isotopes. Also, it is established that a Smarandache inverse property loop in which all its f,g-principal isotopes are Smarandache f,g-principal isotopes is universal if and only if it is a Smarandache Moufang loop in which all its f,g-principal isotopes are Smarandache f,g-principal isotopes. Hence, some of the autotopisms earlier mentioned are found to be true in the Smarandache sub-loops of universal Smarandache: left(right) inverse property loops and inverse property loops.

Temitope Gbolahan Jaiyeola

2006-07-28T23:59:59.000Z

442

Montana Ground Water Assessment Act (Montana) | Department of...  

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

Ground Water Assessment Act (Montana) Montana Ground Water Assessment Act (Montana) Eligibility Utility Fed. Government Commercial Agricultural Investor-Owned Utility State...

443

Ground Gravity Survey At Marysville Mt Area (Blackwell) | Open...  

Open Energy Info (EERE)

Ground Gravity Survey At Marysville Mt Area (Blackwell) Exploration Activity Details Location Marysville Mt Area Exploration Technique Ground Gravity Survey Activity Date...

444

Designated Ground Water Basin Map | Open Energy Information  

Open Energy Info (EERE)

Designated Ground Water Basin Map Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Reference Material: Designated Ground Water Basin Map Details Activities (0) Areas...

445

Deputy Secretary Poneman Attends Ground Breaking at Tennessee...  

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

Home Deputy Secretary Poneman Attends Ground Breaking at Tennessee Advanced Vehicle Battery Plant Deputy Secretary Poneman Attends Ground Breaking at Tennessee Advanced Vehicle...

446

Department of Veterans Affairs, FONSI - Ground mounted solar...  

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

Ground mounted solar photovoltaic power at San Joaquin National Cemetery Department of Veterans Affairs, FONSI - Ground mounted solar photovoltaic power at San Joaquin National...

447

EA-1406: Ground Water Compliance at the New Rifle, Colorado,...  

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

6: Ground Water Compliance at the New Rifle, Colorado, UMTRA Project Site, Rifle, Colorado EA-1406: Ground Water Compliance at the New Rifle, Colorado, UMTRA Project Site, Rifle,...

448

Ground Gravity Survey At Mcgee Mountain Area (DOE GTP) | Open...  

Open Energy Info (EERE)

Ground Gravity Survey At Mcgee Mountain Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Ground Gravity Survey At Mcgee Mountain...

449

Water Quality Surface and Ground | Open Energy Information  

Open Energy Info (EERE)

Quality Surface and Ground Jump to: navigation, search Retrieved from "http:en.openei.orgwindex.php?titleWaterQualitySurfaceandGround&oldid612197...

450

GROUND PLANE INSULATION FAILURE IN THE FIRST TPC SUPERCONDUCTING COIL  

E-Print Network (OSTI)

is WIUUTEO GROUND PLANE INSULATION FAILURE IN THE FIRST TPCOn August 27, 1980, an insulation failure occurred dt-ringby a failure uf ground plane insulation. ACKNOWLEDGMENTS The

Green, M.A.

2010-01-01T23:59:59.000Z

451

Vertical Distribution of Contamination in Ground Water at the...  

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

Vertical Distribution of Contamination in Ground Water at the Tuba City, Arizona, Site Vertical Distribution of Contamination in Ground Water at the Tuba City, Arizona, Site...

452

Radiological status of the ground water beneath the Hanford Site, January-December 1981  

Science Conference Proceedings (OSTI)

During 1981, 299 monitoring wells were sampled at various times for radionuclide chemical contaminants. This report is one of a series prepared annually to document and evaluate the status of ground water at the Hanford Site. Two substances, tritium and nonradioactive nitrate, are easily transported in ground water; therefore, these substances are used as primary tracers to monitor the movement of contaminated ground water. Data collected during 1981 describe the movement of tritium and the nonradioactive nitrate plumes as well as their response to the influences of ground-water flow, ionic dispersion, and radioactive decay. The gross beta (/sup 106/Ru) levels have become so low that it will no longer be considered a major radionuclide contaminant. The tritium plume continues to show increasing concentrations near the Columbia River. While it is mapped as having reached the Columbia River, its contribution to the river has not been distinguished from other sources at this time. This plume shows much the same configuration as in 1977, 1978, 1979, and 1980. The size of the nitrate plume appears stable. Concentrations of nitrate in the vicinity of the 100-H Area continue to be high as a result of past leaks from the evaporation facility. The overall quality of the ground water at the Hanford Site is generally comparable to that of other ground waters in eastern Washington. Any exceptions to this statement will be noted in this report.

Eddy, P.A.; Cline, C.S.; Prater, L.S.

1982-04-01T23:59:59.000Z

453

An Analysis of Loop Current Frontal Eddies in a ° Atlantic Ocean Model Simulation  

Science Conference Proceedings (OSTI)

The Loop Current frontal eddies (LCFEs) refer to cyclonic cold eddies moving downstream along the outside edge of the Loop Current in the eastern Gulf of Mexico. They have been observed by in situ measurements and satellite imagery, mostly ...

Haosheng Huang; Nan D. Walker; Ya Hsueh; Yi Chao; Robert R. Leben

2013-09-01T23:59:59.000Z

454

On the Linear Relationship between Loop Current Retreat Latitude and Eddy Separation Period  

Science Conference Proceedings (OSTI)

A linear correlation exists between the retreat latitude of the Loop Current following eddy separation and the subsequent eddy separation period. This empirical relationship was first identified in satellite altimeter-derived Loop Current ...

Alexis Lugo-Fernández; Robert R. Leben

2010-12-01T23:59:59.000Z

455

An Analysis of Loop Current Frontal Eddies in a 1/6° Atlantic Ocean Model Simulation  

Science Conference Proceedings (OSTI)

The Loop Current Frontal Eddies (LCFEs) refer to cyclonic cold eddies moving downstream along the outside edge of the Loop Current in the eastern Gulf of Mexico. They have been observed by in-situ measurements and satellite imagery, mostly ...

Haosheng Huang; Nan D. Walker; Ya Hsueh; Yi Chao; Robert R. Leben

456

MODELING OF GYROSYNCHROTRON RADIO EMISSION PULSATIONS PRODUCED BY MAGNETOHYDRODYNAMIC LOOP OSCILLATIONS IN SOLAR FLARES  

Science Conference Proceedings (OSTI)

A quantitative study of the observable radio signatures of the sausage, kink, and torsional magnetohydrodynamic (MHD) oscillation modes in flaring coronal loops is performed. Considering first non-zero order effect of these various MHD oscillation modes on the radio source parameters such as magnetic field, line of sight, plasma density and temperature, electron distribution function, and the source dimensions, we compute time-dependent radio emission (spectra and light curves). The radio light curves (of both flux density and degree of polarization) at all considered radio frequencies are then quantified in both time domain (via computation of the full modulation amplitude as a function of frequency) and in Fourier domain (oscillation spectra, phases, and partial modulation amplitude) to form the signatures specific to a particular oscillation mode and/or source parameter regime. We found that the parameter regime and the involved MHD mode can indeed be distinguished using the quantitative measures derived in the modeling. We apply the developed approach to analyze radio burst recorded by Owens Valley Solar Array and report possible detection of the sausage mode oscillation in one (partly occulted) flare and kink or torsional oscillations in another flare.

Mossessian, George; Fleishman, Gregory D. [Center For Solar-Terrestrial Research, New Jersey Institute of Technology, Newark, NJ 07102 (United States)

2012-04-01T23:59:59.000Z

457

Longevity of Emplacement Drift Ground Support Materials  

SciTech Connect

The purpose of this analysis is to evaluate the factors affecting the longevity of emplacement drift ground support materials and to develop a basis for selection of materials for ground support that will function throughout the preclosure period. The Development Plan (DP) for this analysis is given in CRWMS M&O (Civilian Radioactive Waste Management System Management and Operating Contractor) (1999a). The candidate materials for ground support are steel (carbon steel, ductile cast iron, galvanized steel, and stainless steel, etc.) and cement. Steel will mainly be used for steel sets, lagging, channels, rock bolts, and wire mesh. Cement usage is only considered in the case of grouted rock bolts. The candidate materials for the invert structure are steel and crushed rock ballast. The materials shall be evaluated for the repository emplacement drift environment under a specific thermal loading condition based on the proposed License Application Design Selection (LADS) design. The analysis consists of the following tasks: (1) Identify factors affecting the longevity of ground control materials for use in emplacement drifts. (2) Review existing documents concerning behavior of candidate ground control materials during the preclosure period. The major criteria to be considered for steel are mechanical and thermal properties, and durability, of which corrosion is the most important concern. (3) Evaluate the available results and develop recommendations for material(s) to be used.

D. Tang

2000-01-07T23:59:59.000Z

458

The HIGGS Boson Mass at 2 Loops in the Finely Tuned Split Supersymmetric Standard Model  

SciTech Connect

The mass of the Higgs boson in the finely tuned Split Supersymmetric Standard Model is calculated. All 1 loop threshold effects are included, in addition to the full RG running of the Higgs quartic coupling through 2 loops. The 2 loop corrections are very small, typically less than 1GeV. The 1 loop threshold corrections to the top yukawa coupling and the Higgs mass generally push the Higgs mass down a few GeV.

Binger, M

2004-09-08T23:59:59.000Z

459

Particle sorter comprising a fluid displacer in a closed-loop fluid circuit  

SciTech Connect

Disclosed herein are methods and devices utilizing a fluid displacer in a closed-loop fluid circuit.

Perroud, Thomas D. (San Jose, CA); Patel, Kamlesh D. (Dublin, CA); Renzi, Ronald F. (Tracy, CA)

2012-04-24T23:59:59.000Z

460

Development of a strong field helicon plasma source  

Science Conference Proceedings (OSTI)

We developed a high-density helicon plasma source with a very strong field of up to 10 kG. Using a double-loop antenna wound around a quartz tube, 9.5 cm in inner diameter and 90 cm in axial length, initial plasmas with a high density more than 10{sup 13} cm{sup -3} were successfully produced with a radio frequency power less than a few kilowatts, and with changing magnetic fields, fill pressures, and gas species.

Shinohara, Shunjiro; Mizokoshi, Hiroshi [Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan)

2006-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "loop ground source" 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

Appendix B Ground Water Management Policy  

Office of Legacy Management (LM)

Ground Water Management Policy Ground Water Management Policy for the Monticello Mill Tailings Site and Adjacent Areas This page intentionally left blank Docun~ent Number Q0029500 Appendix B State of Utah DEPARTblENT OF NATURAL RESOURCES DIVISION OF WATER RIGHTS Ground-Water Management Policy for the Mot~ticello Mill Tailings Site and Adjacent Areas The Monticello Mill Tailings Site is on the southeast portion of the tovm of Monticello in Sectton 36, T33S, K23E and Section 31, i33S. R24E, SLB&M. The mill site was used from 1942 to 1960 in the processing of uranium and vanadium. The U.S. Department of Energy (DOE) is currently cleaning up the site. The site is in the small canyon that forms the drainage for South Creek. The general direction of water flow, of both surface streams and the shallow

462

Definition: Ground Gravity Survey | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Ground Gravity Survey Jump to: navigation, search Dictionary.png Ground Gravity Survey The ground gravitational method is the study of the distribution of mass in the subsurface with the observation point at the earth's surface.[1] View on Wikipedia Wikipedia Definition A gravity anomaly is the difference between the observed acceleration of a planet's gravity and a value predicted from a model. A location with a positive anomaly exhibits more gravity than predicted, while a negative anomaly exhibits a lower value than predicted. References ↑ http://www.amazon.com/Geophysical-Field-Theory-Three-Volume-Gravitational/dp/0124020410 Ret Like Like You like this.Sign Up to see what your friends like.

463

GroundedPower Inc | Open Energy Information  

Open Energy Info (EERE)

GroundedPower Inc GroundedPower Inc Jump to: navigation, search Name GroundedPower Inc Place Gloucester, Massachusetts Zip 1930 Product Massachusetts-based company developing home and building energy management systems via IP-based software. Coordinates 37.413962°, -76.526305° 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":37.413962,"lon":-76.526305,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

464

Ground Gravity Survey | Open Energy Information  

Open Energy Info (EERE)

Ground Gravity Survey Ground Gravity Survey Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Ground Gravity Survey Details Activities (48) Areas (34) Regions (2) NEPA(2) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Gravity Techniques Parent Exploration Technique: Gravity Techniques Information Provided by Technique Lithology: Distribution of density in the subsurface enables inference of rock type. Stratigraphic/Structural: Delineation of steeply dipping formations, geological discontinuities and faults, intrusions and large-scale deposition of silicates due to hydrothermal activity. Hydrological: Density of sedimentary rocks are strongly influenced by fluid contained within pore space. Dry bulk density refers to the rock with no moisture, while the wet bulk density accounts for water saturation; fluid content may alter density by up to 30%.(Sharma, 1997)

465

Brief Nonlinear stabilization of a thermal convection loop by state feedback  

Science Conference Proceedings (OSTI)

A nonlinear feedback control law that achieves global asymptotic stabilization of a 2D thermal convection loop (widely known for its ''Lorenz system'' approximation) is presented. The loop consists of viscous Newtonian fluid contained in between two ... Keywords: Backstepping, Boundary control, Convection loop

Dejan M. BošKovi?; Miroslav Krsti?

2001-12-01T23:59:59.000Z

466

Model Free Closed-Loop Flow Control ERCAN ATAM, LIONEL MATHELIN, LAURENT CORDIER  

E-Print Network (OSTI)

Model Free Closed-Loop Flow Control ERCAN ATAM, LIONEL MATHELIN, LAURENT CORDIER *CNRS- Mathelin-Cordier (LIMSI-CNRS,IP') Model Free Closed-Loop Flow Control ECCOMAS'12 1 / 21 #12;Outline 1 and some future work Atam- Mathelin-Cordier (LIMSI-CNRS,IP') Model Free Closed-Loop Flow Control ECCOMAS'12

Mathelin, Lionel

467

Development of a Hardware-in-the-loop Simulation System for Hybrid Electric Vehicle Performance Test  

Science Conference Proceedings (OSTI)

In order to facilitate control strategy development and performance test of hybrid electric vehicle, a hardware-in-the-loop simulation system is developed. The system is constructed with LabVIEW and PXI hardware. Hardware-in-the-loop simulation test ... Keywords: hybrid electric vehicle, hardware-in-the-loop simulation, fuel economy, exhaust emission

Yanyi Zhang, Zhenhua Jin, Haoduan Wang, Qingchun Lu

2012-07-01T23:59:59.000Z

468

Ga-based passive loop optimization for magnetic field mitigation of transmission lines  

Science Conference Proceedings (OSTI)

This paper presents a systematic method to assist in the design of passive loops with the aim of mitigating the magnetic field generated by overhead transmission lines. The procedure is based on a two-dimensional (2D) modeling of the magnetic field, ... Keywords: Compensated loop, Genetic algorithm, Magnetic field, Mitigation, Passive loop, Reduction factor

Pedro Cruz; Jesús M. Riquelme; Antonio de la Villa; José L. Martínez

2007-10-01T23:59:59.000Z

469

Water budget for SRP burial ground area  

SciTech Connect

Radionuclide migration from the SRP burial ground for solid low-level waste has been studied extensively. Most of the buried radionuclides are fixed on the soil and show negligible movement. The major exception is tritium, which when leached from the waste by percolating rainfall, forms tritiated water and moves with the groundwater. The presence of tritium has been useful in tracing groundwater flow paths to outcrop. A subsurface tritium plume moving from the southwest corner of the burial ground toward an outcrop near Four Mile Creek has been defined. Groundwater movement is so slow that much of the tritium decays before reaching the outcrop. The burial ground tritium plume defined to date is virtually all in the uppermost sediment layer, the Barnwell Formation. The purpose of the study reported in this memorandum was to investigate the hypothesis that deeper flow paths, capable of carrying substantial amounts of tritium, may exist in the vicinity of the burial ground. As a first step in seeking deeper flow paths, a water budget was constructed for the burial ground site. The water budget, a materials balance used by hydrologists, is expressed in annual area inches of rainfall. Components of the water budget for the burial ground area were analyzed to determine whether significant flow paths may exist below the tan clay. Mean annual precipitation was estimated as 47 inches, with evapotranspiration, run-off, and groundwater recharge estimated as 30, 2, and 15 inches, respectively. These estimates, when combined with groundwater discharge data, suggest that 5 inches of the groundwater recharge flow above the tan clay and that 10 inches flow below the tan clay. Therefore, two-thirds of the groundwater recharge appears to follow flow paths that are deeper than those previously found. 13 references, 10 figures, 5 tables.

Hubbard, J.E.; Emslie, R.H.

1984-03-19T23:59:59.000Z

470

Ground-Based Microwave Radiometer Measurements  

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

Ground-Based Microwave Radiometer Measurements Ground-Based Microwave Radiometer Measurements and Radiosonde Comparisons During the WVIOP2000 Field Experiment D. Cimini University of L'Aquila L'Aquil, Italy E. R. Westwater Cooperative Institute for Research in the Environmental Sciences University of Colorado National Oceanic and Atmospheric Administration Environmental Technology Laboratory Boulder, Colorado Y. Han Science System Applications National Aeronautics Space Administration Goddard Space Flight Center Greenbelt, Maryland S. Keihm Jet Propulsion Laboratory California Institute of Technology Pasadena, California Introduction During September to October 2000, a water vapor intensive operational period (WVIOP) was conducted at the Atmospheric Radiation Measurement (ARM) Program's Southern Great Plains (SGP) Cloud and

471

Microsoft Word - DOE Report on OSU Looping final.doc  

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

December 2007 December 2007 DOE/NETL-2008/1307 Independent Assessment of the Potential of Chemical-Looping in the Context of a Fischer-Tropsch Plant Chemical-Looping Process in a Coal-to-Liquids Configuration Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name,

472

NETL: Alstom's Chemical Looping Combustion Technology with CO2 Capture  

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

Oxy-Combustion CO2 Emissions Control Oxy-Combustion CO2 Emissions Control Commercialization of the Iron Based Coal Direct Chemical Looping Process for Power Production with in situ CO2 Capture Project No.: DE-FE0009761 CDLC Process Concept CDLC Process Concept (click to enlarge) Babcock & Wilcox Power Generation Group (B&W) is developing the coal direct chemical looping (CDCL) process. The CDCL process consists of a unique moving bed reactor - the reducer - where pulverized coal is fully converted using iron-based oxygen carriers. The oxygen carrier is reduced from Fe2O3 to FeO/Fe and the flue gas is a concentrated stream of CO2 that is available for storage or beneficial use. The reduced FeO/Fe is oxidized to Fe2O3 using air in the combustor, liberating heat to produce steam for a

473

A loop group extension of the odd Chern character.  

E-Print Network (OSTI)

We show that the universal odd Chern form, defined on the stable unitary group $U$, extends to the loop group $LU$ in a way that is closed with respect to an equivariant-type differential. This provides an odd analogue to the Bismut-Chern form. We also describe the associated transgression form, the so-called Bismut-Chern-Simons form, and explicate some properties it inherits as a differential form on the space of maps of a cylinder into the stable unitary group. As a corollary, we obtain the Chern character homomorphism from odd K-theory to the periodic cohomology of the free loop space, represented geometrically on the level of differential forms.

Scott O. Wilson

474

Scaling law for the heating of solar coronal loops  

E-Print Network (OSTI)

We report preliminary results from a series of numerical simulations of the reduced magnetohydrodynamic equations, used to describe the dynamics of magnetic loops in active regions of the solar corona. A stationary velocity field is applied at the photospheric boundaries to imitate the driving action of granule motions. A turbulent stationary regime is reached, characterized by a broadband power spectrum $E_k\\simeq k^{-3/2}$ and heating rate levels compatible with the heating requirements of active region loops. A dimensional analysis of the equations indicates that their solutions are determined by two dimensionless parameters: the Reynolds number and the ratio between the Alfven time and the photospheric turnover time. From a series of simulations for different values of this ratio, we determine how the heating rate scales with the physical parameters of the problem, which might be useful for an observational test of this model.

Pablo Dmitruk; Daniel Gomez

1999-10-18T23:59:59.000Z

475

Magnetic and electric screening masses from Polyakov-loop correlations  

E-Print Network (OSTI)

Screening properties of the quark gluon plasma are studied from Polyakov-loop correlation in lattice QCD simulations with two flavors of improved Wilson quarks at temperatures $T/\\Tpc \\simeq 1$--4 where $\\Tpc$ is the pseudocritical temperature. Using the Euclidean-time reflection symmetry and the charge conjugation symmetry, we introduce various types of Polyakov-loop correlation functions and extract screening masses in magnetic and electric sectors. We find that the temperature dependence of the screening masses are well described by the weak coupling expansion. We also find that a ratio of the screening masses in the electric sector to the magnetic sector shows qualitative agreement with a prediction from the dimensionally-reduced effective field theory and the N=4 supersymmetric Yang-Mills theory at $1.3 < T/\\Tpc < 3$.

Y. Maezawa; S. Aoki; S. Ejiri; T. Hatsuda; N. Ishii; K. Kanaya; N. Ukita; T. Umeda

2008-11-04T23:59:59.000Z

476

Dynamical eigenfunctions and critical density in loop quantum cosmology  

E-Print Network (OSTI)

We offer a new, physically transparent argument for the existence of the critical, universal maximum matter density in loop quantum cosmology for the case of a flat Friedmann-Lemaitre-Robertson-Walker cosmology with scalar matter. The argument is based on the existence of a sharp exponential ultraviolet cutoff in momentum space on the eigenfunctions of the quantum cosmological dynamical evolution operator (the gravitational part of the Hamiltonian constraint), attributable to the fundamental discreteness of spatial volume in loop quantum cosmology. The existence of the cutoff is proved directly from recently found exact solutions for the eigenfunctions for this model. As a consequence, the operators corresponding to the momentum of the scalar field and the spatial volume approximately commute. The ultraviolet cutoff then implies that the scalar momentum, though not a bounded operator, is in effect bounded on subspaces of constant volume, leading to the upper bound on the expectation value of the matter densit...

Craig, David A

2012-01-01T23:59:59.000Z

477

Wilson loops in string duals of walking and flavored systems  

Science Conference Proceedings (OSTI)

We consider the vacuum expectation value of Wilson loop operators by studying the behavior of string probes in solutions of type-IIB string theory generated by N{sub c} D5-branes wrapped on an S{sup 2} internal manifold. In particular, we focus on solutions to the background equations that are dual to field theories with a walking gauge coupling as well as for flavored systems. We present in detail our walking solution and emphasize various general aspects of the procedure to study Wilson loops using string duals. We discuss the special features that the strings show when probing the region associated with the walking of the field-theory coupling.

Nunez, Carlos; Piai, Maurizio; Rago, Antonio [Swansea University, School of Physical Sciences, Singleton Park, Swansea, Wales (United Kingdom)

2010-04-15T23:59:59.000Z

478

The Circadian Rhythm, A Continuous Transcription-Translation Feedback Loop,  

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

Circadian Rhythm, A Continuous Transcription-Translation Feedback Loop, Circadian Rhythm, A Continuous Transcription-Translation Feedback Loop, Contributes to Low-Dose Radiation-Induced Radioadaptive Response Aris Alexandrou University of California Davis Abstract The initiation of the circadian rhythm field occurred when the Takahashi group defined a mutation in th