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1

SunShot Initiative: High-Concentration, Low-Cost Parabolic Trough...  

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

High-Concentration, Low-Cost Parabolic Trough System for Baseload CSP to someone by E-mail Share SunShot Initiative: High-Concentration, Low-Cost Parabolic Trough System for...

2

NREL: TroughNet - Parabolic Trough Workshops  

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

Parabolic Trough Workshops Parabolic Trough Workshops Here you'll find information about workshops and forums concerning parabolic trough technology and concentrating solar power. Also, see upcoming events on concentrating solar power. Past Workshops and Forums 2007 Parabolic Trough Technology Workshop March 8-9, 2007 Golden, CO 2007 Solar Power Tower, Dish Stirling and Linear Fresnel Technologies Workshop March 7, 2007 Golden, CO 2006 Parabolic Trough Technology Workshop February 14-16, 2006 Incline Village, NV 2004 Solar Thermal Electric International Project Development Forum July 13, 2004 Portland, OR 2003 Parabolic Trough Thermal Energy Storage Workshop February 20-21, 2003 Golden, CO 2001 Solar Energy Forum: The Power to Choose April 21-25, 2001 Washington, D.C. 2000 Parabolic Trough Technology Workshop

3

Session: Parabolic Troughs (Presentation)  

DOE Green Energy (OSTI)

The project description is R and D activities at NREL and Sandia aimed at lowering the delivered energy cost of parabolic trough collector systems and FOA awards to support industry in trought development. The primary objectives are: (1) support development of near-term parabolic trought technology for central station power generation; (2) support development of next-generation trought fields; and (3) support expansion of US trough industry. The major FY08 activities were: (1) improving reflector optics; (2) reducing receiver heat loss (including improved receiver coating and mitigating hydrogen accumulation); (3) measuring collector optical efficiency; (4) optimizing plant performance and reducing cost; (5) reducing plant water consumption; and (6) directly supporting industry needs, including FOA support.

Kutscher, C.

2008-04-01T23:59:59.000Z

4

NREL: TroughNet - Parabolic Trough FAQs  

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

Parabolic Trough FAQs Parabolic Trough FAQs Find answers to frequently asked questions about parabolic trough solar technology. Question topics include: Central station solar benefits Economic and environmental benefits Electricity cost Installation and operation Land use Large-scale vs. distributed power Past construction decline Photovoltaics comparison Power plant cost Power plant siting Technology potential Water use Some of the following documents are available as Adobe Acrobat PDFs. How much does a parabolic trough power plant cost? The cost of a parabolic trough power plant depends on many factors such as plant size, whether thermal energy storage is included, and whether the solar field has been enlarged to increase the annual plant capacity factor. Based on these considerations the current capital cost for large

5

NREL: TroughNet - Parabolic Trough Power Plant Market, Economic...  

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

Parabolic Trough Power Plant Market, Economic Assessment and Deployment Parabolic trough technology is the most commercially mature, large-scale solar power technology in the...

6

SunShot Initiative: Parabolic Trough  

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

development (R&D) in parabolic trough systems as one of four concentrating solar power (CSP) technologies aiming to meet the goals of the SunShot Initiative. Parabolic troughs,...

7

NREL: TroughNet - Parabolic Trough Power Plant System Technology  

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

Parabolic Trough Power Plant System Technology Parabolic Trough Power Plant System Technology A parabolic trough solar power plant uses a large field of collectors to supply thermal energy to a conventional power plant. Because they use conventional power cycles, parabolic trough power plants can be hybridized-other fuels can be used to back up the solar power. Like all power cycles, trough power plants also need a cooling system to transfer waste heat to the environment. Parabolic trough power plant technologies include: Direct steam generation Fossil-fired (hybrid) backup Operation and maintenance Power cycles Steam Rankine Organic Rankine Combined Wet and dry cooling Power Cycles A photo of an aerial view of a power plant in the middle of a solar field with rows and rows of parabolic troughs tracking. The cooling towers can be seen with the water plume rising into the air. The white water tanks can be seen in the background.

8

Parabolic-Trough Solar Water Heating--FTA, 022798m FTA trough...  

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

Parabolic-Trough Solar Water Heating--FTA, 022798m FTA trough Parabolic-Trough Solar Water Heating--FTA, 022798m FTA trough Federal Technology Alert covers parabolic-trough solar...

9

Performance of a parabolic trough solar collector.  

E-Print Network (OSTI)

??Parabolic trough solar collectors (PTSCs) constitute a proven source of thermal energy for industrial process heat and power generation, although their implementation has been strongly… (more)

Brooks, Michael John

2005-01-01T23:59:59.000Z

10

NREL: TroughNet - Parabolic Trough Technology Overview  

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

Technology Overview Technology Overview Parabolic trough solar power technology offers an environmentally sound and increasingly cost-effective energy source. Here you'll find overviews about the following parabolic trough power plant technologies: Solar Field Collector balance of system Concentrator structure Mirrors Receivers Thermal Energy Storage Molten-salt heat transfer fluid Storage media Storage systems Power Plant Systems Direct steam generation Fossil-fired hybrid backup Power cycles Wet and dry cooling Operation and maintenance For more detailed, technical information, see our publications on parabolic trough power plant technology. Printable Version TroughNet Home Technologies Solar Field Thermal Energy Storage Power Plant Systems Market & Economic Assessment Research & Development

11

NREL: TroughNet - Parabolic Trough System and Component Testing  

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

System and Component Testing System and Component Testing Here you'll find information about parabolic trough system and components testing, as well facilities and laboratories used for testing. Tests include those for: Concentrator thermal efficiency Receiver thermal performance Mirror contour and collector alignment Mirror reflectivity and durability Some of the following documents are available as Adobe Acrobat PDFs. Download Adobe Reader. Concentrator Thermal Efficiency Testing Researchers and industry use the following facilities for testing parabolic trough collectors. AZTRAK Rotating Platform At Sandia National Laboratories' National Solar Thermal Test Facility (NSTTF), the AZTRAK rotating platform has been used to test several parabolic trough modules and receivers. Initially, researchers tested a

12

Definition: Parabolic trough | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Parabolic trough Jump to: navigation, search Dictionary.png Parabolic trough A solar energy conversion device that uses a trough covered with a highly reflective surface to focus sunlight onto a linear absorber containing a working fluid that can be used to spin a turbine for electricity generation; with a single-axis sun-tracking system, the configuration of a parabolic trough can track the sun from east to west during the day.[1][2][3] View on Wikipedia Wikipedia Definition A parabolic trough is a type of solar thermal collector that is straight in one dimension and curved as a parabola in the other two, lined with a polished metal mirror. The energy of sunlight which enters the

13

NREL: TroughNet - 2007 Parabolic Trough Technology Workshop  

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

2007 Parabolic Trough Technology Workshop 2007 Parabolic Trough Technology Workshop NREL hosted a parabolic trough technology workshop on March 8-9, 2007, in Golden, Colorado. It had three goals: Exchanging technical information Collaborating on SolarPaces projects: receiver testing and dry cooling Gathering industry input on laboratory R&D directions. The workshop featured presentations on the following parabolic trough power plant topics: Current and future market vision Project developments Solar resource assessment Technology trends Molten-salt heat transfer fluids Direct steam generation Advanced tools and testing capabilities Researchers also presented a poster session on laboratory capabilities. Note: if a presentation or poster isn't listed below, NREL hasn't yet received permission or approval to post it.

14

NREL: TroughNet - Parabolic Trough Thermal Energy Storage Technology  

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

Thermal Energy Storage Technology One advantage of parabolic trough power plants is their potential for storing solar thermal energy to use during non-solar periods and to dispatch...

15

Parabolic Trough Solar Thermal Electric Power Plants  

DOE Green Energy (OSTI)

Although many solar technologies have been demonstrated, parabolic trough solar thermal electric power plant technology represents one of the major renewable energy success stories of the last two decades.

Not Available

2003-06-01T23:59:59.000Z

16

Hydrogen Removal From Heating Oil of a Parabolic Trough ...  

Hydrogen Removal From Heating Oil of a Parabolic Trough Increases the Life of the Trough and its Components A Method to Selectively Remove & Measure Hydrogen Gas from ...

17

Parabolic Trough VSHOT Optical Characterization in 2005-2006 (Presentation)  

DOE Green Energy (OSTI)

This presentation regarding parabolic trough VSHOT optical characterization describes trough deployment and operation phases including: development, manufacture/installation, and maintenance/operation.

Wendelin, T.

2006-02-01T23:59:59.000Z

18

Parabolic trough solar collectors : design for increasing efficiency  

E-Print Network (OSTI)

Parabolic trough collectors are a low cost implementation of concentrated solar power technology that focuses incident sunlight onto a tube filled with a heat transfer fluid. The efficiency and cost of the parabolic trough ...

Figueredo, Stacy L. (Stacy Lee), 1981-

2011-01-01T23:59:59.000Z

19

Solargenix Energy Advanced Parabolic Trough Development  

SciTech Connect

The Solargenix Advanced Trough Development Project was initiated in the Year 2000 with the support of the DOE CSP Program and, more recently, with the added support of the Nevada Southwest Energy Partnership. Parabolic trough plants are the most mature solar power technology, but no large-scale plants have been built in over a decade. Given this lengthy lull in deployment, our first Project objective was development of improved trough technology for near-term deployment, closely patterned after the best of the prior-generation troughs. The second objective is to develop further improvements in next-generation trough technology that will lead to even larger reductions in the cost of the delivered energy. To date, this Project has successfully developed an advanced trough, which is being deployed on a 1-MW plant in Arizona and will soon be deployed in a 64-MW plant in Nevada. This advanced trough offers a 10% increase in performance and over an 20% decrease in cost, relative to prior-generation troughs.

Gee, R. C.; Hale, M. J.

2005-11-01T23:59:59.000Z

20

NREL: TroughNet - U.S. Parabolic Trough Power Plant Data  

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

U.S. Parabolic Trough Power Plant Data Here you'll find data on parabolic trough power plants in operation and under development in the United States. The data include plant type,...

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Experimental parabolic trough collector performance characterization  

DOE Green Energy (OSTI)

Experimental data from the Collector Module Test Facility (CMTF) at Sandia National Laboratories, Albuquerque, are used to develop a collector performance model and characterize three parabolic trough solar collectors. The independent variables used in the model are selected and fitted to the experimental data using a multiple linear regression technique. The collector model developed accounts for optical performance, including incident angle effects and thermal losses, both linear and non-linear.

Lukens, L.L.

1981-05-01T23:59:59.000Z

22

Parabolic Trough Organic Rankine Cycle Power Plant  

DOE Green Energy (OSTI)

Arizona Public Service (APS) is required to generate a portion of its electricity from solar resources in order to satisfy its obligation under the Arizona Environmental Portfolio Standard (EPS). In recent years, APS has installed and operates over 4.5 MWe of fixed, tracking, and concentrating photovoltaic systems to help meet the solar portion of this obligation and to develop an understanding of which solar technologies provide the best cost and performance to meet utility needs. During FY04, APS began construction of a 1-MWe parabolic trough concentrating solar power plant. This plant represents the first parabolic trough plant to begin construction since 1991. The plant will also be the first commercial deployment of the Solargenix parabolic trough collector technology developed under contract to the National Renewable Energy Laboratory (NREL). The plant will use an organic Rankine cycle (ORC) power plant, provided by Ormat. The ORC power plant is much simpler than a conventional steam Rankine cycle power plant and allows unattended operation of the facility.

Canada, S.; Cohen, G.; Cable, R.; Brosseau, D.; Price, H.

2005-01-01T23:59:59.000Z

23

Field Survey of Parabolic Trough Receiver Thermal Performance: Preprint  

SciTech Connect

This paper describes a technique that uses an infrared camera to evaluate the in-situ thermal performance of parabolic trough receivers at operating solar power plants.

Price, H.; Forristall, R.; Wendelin, T.; Lewandowski, A.; Moss, T.; Gummo, C.

2006-04-01T23:59:59.000Z

24

Parabolic Trough Solar Thermal Electric Power Plants (Fact Sheet)  

DOE Green Energy (OSTI)

This fact sheet provides an overview of the potential for parabolic trough solar thermal electric power plants, especially in the Southwestern U.S.

Not Available

2006-07-01T23:59:59.000Z

25

Hydrogen Removal From Heating Oil of a Parabolic Trough ...  

A Method to Selectively Remove & Measure Hydrogen Gas from a Fluid Volume Parabolic trough power plants use concentrated solar thermal energy to ...

26

Long-term average performance benefits of parabolic trough improvements  

DOE Green Energy (OSTI)

Improved parabolic trough concentrating collectors will result from better design, improved fabrication techniques, and the development and utilization of improved materials. This analysis quantifies the relative merit of various technological advancements in improving the long-term average performance of parabolic trough concentrating collectors and presents them graphically as a function of operating temperature for north-south, east-west, and polar mounted parabolic troughs. Substantial annual energy gains (exceeding 50% at 350/sup 0/C) are shown to be attainable with improved parabolic troughs.

Gee, R.; Gaul, H.; Kearney, D.; Rabl, A.

1979-10-01T23:59:59.000Z

27

Simplified Methodology for Designing Parabolic Trough Solar Power Plants.  

E-Print Network (OSTI)

??The performance of parabolic trough based solar power plants over the last 25 years has proven that this technology is an excellent alternative for the… (more)

Vasquez Padilla, Ricardo

2011-01-01T23:59:59.000Z

28

Parabolic trough solar collectors : design for increasing efficiency.  

E-Print Network (OSTI)

??Parabolic trough collectors are a low cost implementation of concentrated solar power technology that focuses incident sunlight onto a tube filled with a heat transfer… (more)

Figueredo, Stacy L. (Stacy Lee), 1981-

2011-01-01T23:59:59.000Z

29

Simplified Methodology for Designing Parabolic Trough Solar Power Plants.  

E-Print Network (OSTI)

?? The performance of parabolic trough based solar power plants over the last 25 years has proven that this technology is an excellent alternative for… (more)

Vasquez Padilla, Ricardo

2011-01-01T23:59:59.000Z

30

Alignment method for parabolic trough solar concentrators  

DOE Patents (OSTI)

A Theoretical Overlay Photographic (TOP) alignment method uses the overlay of a theoretical projected image of a perfectly aligned concentrator on a photographic image of the concentrator to align the mirror facets of a parabolic trough solar concentrator. The alignment method is practical and straightforward, and inherently aligns the mirror facets to the receiver. When integrated with clinometer measurements for which gravity and mechanical drag effects have been accounted for and which are made in a manner and location consistent with the alignment method, all of the mirrors on a common drive can be aligned and optimized for any concentrator orientation.

Diver, Richard B. (Albuquerque, NM)

2010-02-23T23:59:59.000Z

31

A new parabolic trough solar collector P. Kohlenbach1  

E-Print Network (OSTI)

) power generation system. The parabolic trough collectors have been installed in the National Solar-selective paint. The absorber operates in a 50mm non-evacuated glass tube to minimize convection losses. Thermal and power generation (CHP), CSIRO has built a solar thermal parabolic trough collector field which

32

An Optical Characterization Technique for Parabolic Trough Solar Collectors Using Images of the Absorber Reection.  

E-Print Network (OSTI)

?? As the concentrating solar power industry competes to develop a less-expensive parabolic trough collector, assurance is needed that new parabolic trough collectors maintain accurate… (more)

Owkes, Jeanmarie Kathleen

2013-01-01T23:59:59.000Z

33

Parabolic-Trough Technology Roadmap | Open Energy Information  

Open Energy Info (EERE)

Parabolic-Trough Technology Roadmap Parabolic-Trough Technology Roadmap Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Parabolic-Trough Technology Roadmap Agency/Company /Organization: National Renewable Energy Laboratory, United States Department of Energy Sector: Energy Focus Area: Renewable Energy, Solar Topics: Technology characterizations Resource Type: Guide/manual Website: www.nrel.gov/csp/troughnet/pdfs/24748.pdf References: Parabolic-Trough Technology Roadmap[1] Overview "The working group reviewed the status of today's trough technologies, evaluated existing markets, identified potential future market opportunities, and developed a roadmap toward its vision of the industry's potential-including critical advancements needed over the long term to significantly reduce costs while further increasing

34

Guidelines for reporting parabolic trough solar electric system performance  

DOE Green Energy (OSTI)

The purpose of this activity is to develop a generic methodology which can be used to track and compare the performance of parabolic trough power plants. The approach needs to be general enough to work for all existing and future parabolic trough plant designs, provide meaningful comparisons of year to year performance, and allow for comparisons between dissimilar plant designs. The approach presented here uses the net annual system efficiency as the primary metric for evaluating the performance of parabolic trough power plants. However, given the complex nature of large parabolic trough plants, the net annual system efficiency by itself does not adequately characterize the performance of the plant. The approach taken here is to define a number of additional performance metrics which enable a more comprehensive understanding of overall plant performance.

Price, H.W.

1997-06-01T23:59:59.000Z

35

Parabolic Trough Receiver Heat Loss Testing (Poster)  

DOE Green Energy (OSTI)

Parabolic trough receivers, or heat collection elements (HCEs), absorb sunlight focused by the mirrors and transfer that thermal energy to a fluid flowing within them. Thje absorbing tube of these receivers typically operates around 400 C (752 F). HCE manufacturers prevent thermal loss from the absorbing tube to the environment by using sputtered selective Cermet coatings on the absorber and by surrounding the absorber with a glass-enclosed evacuated annulus. This work quantifies the heat loss of the Solel UVAC2 and Schott PTR70 HCEs. At 400 C, the HCEs perform similarly, losing about 400 W/m of HCE length. To put this in perspective, the incident beam radiation on a 5 m mirror aperture is about 4500 W/m, with about 75% of that energy ({approx} 3400 W/m) reaching the absorber surface. Of the 3400 W/m on the absorber, about 3000 W/m is absorbed into the working fluid while 400 W/m is lost to the environment.

Price, H.; Netter, J.; Bingham, C.; Kutscher, C.; Burkholder, F.; Brandemuehl, M.

2007-03-01T23:59:59.000Z

36

Theoretical Investigation of the Closed Type Parabolic Trough  

Science Conference Proceedings (OSTI)

Of a closed type parabolic trough solar collector, the thermal performance was analyzed, and a mathematical model was proposed, and experience system was built. As well mathematical model was validated with the measure data. Keywords: trough solar power, collector, numerical simulation, thermal analysis

Zhong-Zhu Qiu; Qiming Li; Peng Li; Yi Zhang; Jia He; Wenwen Guo

2012-07-01T23:59:59.000Z

37

Optimal Heat Collection Element Shapes for Parabolic Trough Concentrators  

DOE Green Energy (OSTI)

For nearly 150 years, the cross section of the heat collection tubes used at the focus of parabolic trough solar concentrators has been circular. This type of tube is obviously simple and easily fabricated, but it is not optimal. It is shown in this article that the optimal shape, assuming a perfect parabolic figure for the concentrating mirror, is instead oblong, and is approximately given by a pair of facing parabolic segments.

Bennett, C

2007-11-15T23:59:59.000Z

38

Current and Future Economics of Parabolic Trough Technology  

Science Conference Proceedings (OSTI)

Solar energy is the largest energy resource on the planet. Unfortunately, it is largely untapped at present, in part because sunlight is a very diffuse energy source. Concentrating solar power (CSP) systems use low cost reflectors to concentrate the sun's energy to allow it to be used more effectively. Concentrating solar power systems are also well suited for large solar power plants that can be connected into the existing utility infrastructure. These two facts mean that CSP systems can be used to make a meaningful difference in energy supply in a relatively short period. CSP plants are best suited for the arid climates in the Southwestern United States, Northern Mexico, and many desert regions around the globe. A recent Western Governors' Association siting study [1] found that the solar potential in the U.S. Southwest is at least 4 times the total U.S. electric demand even after eliminating urban areas, environmentally sensitive areas, and all regions with a ground slope greater than 1%.While it is currently not practical to power the whole county from the desert southwest, only a small portion of this area is needed to make a substantial contribution to future U.S. electric needs. Many of the best sites are near existing high-voltage transmission lines and close to major power load centers in the Southwest (Los Angeles, Las Vegas, and Phoenix). In addition, the power provided by CSP technologies has strong coincidence with peak electric demand, especially in the Southwest where peak demand corresponds in large part to air conditioning loads. Parabolic troughs currently represent the most cost-effective CSP technology for developing large utility-scale solar electric power systems. These systems are also one of the most mature solar technologies, with commercial utility-scale plants that have been operating for over 20 years. In addition, substantial improvements have been made to the technology in recent years including improved efficiency and the addition of thermal energy storage. The main issue for parabolic trough technology is that the cost of electricity is still higher than the cost of electricity from conventional natural gas-fired power plants. Although higher natural gas prices are helping to substantially reduce the difference between the cost of electricity from solar and natural gas plants, in the near-term increased incentives such as the 30% Investment Tax Credit (ITC) are needed to make CSP technology approach competitiveness with natural gas power on a financial basis. In the longer term, additional reductions in the cost of the technology will be necessary. This paper looks at the near-term potential for parabolic trough technology to compete with conventional fossil power resources in the firm, intermediate load power market and at the longer term potential to compete in the baseload power market. The paper will consider the potential impact of a reduced carbon emissions future.

Price, H.; Mehos, M.; Kutscher, C.; Blair, N.

2007-01-01T23:59:59.000Z

39

Parabolic-Trough Solar Water Heating--FTA, 022798m FTA trough  

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

Parabolic-trough solar water heating is Parabolic-trough solar water heating is a well-proven technology that directly sub- stitutes renewable energy for conventional energy in water heating. Parabolic-trough collectors can also drive absorption cooling systems or other equipment that runs off a thermal load. There is considerable potential for using these technologies at Federal facil- ities in the Southwestern United States or other areas with high direct-beam solar radi- ation. Facilities such as jails, hospitals, and barracks that consistently use large volumes of hot water are particularly good candi- dates. Use of parabolic-trough systems helps Federal facilities comply with Executive Order 12902's directive to reduce energy use by 30% by 2005 and advance other efforts to get the Federal government to set a good

40

Status of APS 1-Mwe Parabolic Trough Project  

SciTech Connect

Arizona Public Service (APS) is currently installing new power facilities to generate a portion of its electricity from solar resources that will satisfy its obligation under the Arizona Environmental Portfolio Standard (EPS). During FY04, APS began construction on a 1-MWe parabolic trough concentrating solar power plant. This plant represents the first parabolic trough plant to begin construction since 1991. Site preparation and construction activities continued throughout much of FY05, and startup activities are planned for Fall 2005 (with completion early in FY06). The plant will be the first commercial deployment of the Solargenix parabolic trough collector technology developed under contract to the National Renewable Energy Laboratory. The plant will use an organic Rankine cycle (ORC) power plant, provided by Ormat. The ORC power plant is much simpler than the conventional steam Rankine cycle plant and allows unattended operation of the facility.

Canada, S.; Brosseau, D.; Kolb, G.; Moore, L.; Cable, R.; Price, H.

2005-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Federal technology alert. Parabolic-trough solar water heating  

DOE Green Energy (OSTI)

Parabolic-trough solar water heating is a well-proven renewable energy technology with considerable potential for application at Federal facilities. For the US, parabolic-trough water-heating systems are most cost effective in the Southwest where direct solar radiation is high. Jails, hospitals, barracks, and other facilities that consistently use large volumes of hot water are particularly good candidates, as are facilities with central plants for district heating. As with any renewable energy or energy efficiency technology requiring significant initial capital investment, the primary condition that will make a parabolic-trough system economically viable is if it is replacing expensive conventional water heating. In combination with absorption cooling systems, parabolic-trough collectors can also be used for air-conditioning. Industrial Solar Technology (IST) of Golden, Colorado, is the sole current manufacturer of parabolic-trough solar water heating systems. IST has an Indefinite Delivery/Indefinite Quantity (IDIQ) contract with the Federal Energy Management Program (FEMP) of the US Department of Energy (DOE) to finance and install parabolic-trough solar water heating on an Energy Savings Performance Contract (ESPC) basis for any Federal facility that requests it and for which it proves viable. For an ESPC project, the facility does not pay for design, capital equipment, or installation. Instead, it pays only for guaranteed energy savings. Preparing and implementing delivery or task orders against the IDIQ is much simpler than the standard procurement process. This Federal Technology Alert (FTA) of the New Technology Demonstration Program is one of a series of guides to renewable energy and new energy-efficient technologies.

NONE

1998-04-01T23:59:59.000Z

42

Long-term average performance benefits of parabolic trough improvements  

DOE Green Energy (OSTI)

Improved parabolic trough concentrating collectors will result from better design, improved fabrication techniques, and the development and utilization of improved materials. The difficulty of achieving these improvements varies as does their potential for increasing parabolic trough performance. The purpose of this analysis is to quantify the relative merit of various technology advancements in improving the long-term average performance of parabolic trough concentrating collectors. The performance benefits of improvements are determined as a function of operating temperature for north-south, east-west, and polar mounted parabolic troughs. The results are presented graphically to allow a quick determination of the performance merits of particular improvements. Substantial annual energy gains are shown to be attainable. Of the improvements evaluated, the development of stable back-silvered glass reflective surfaces offers the largest performance gain for operating temperatures below 150/sup 0/C. Above 150/sup 0/C, the development of trough receivers that can maintain a vacuum is the most significant potential improvement. The reduction of concentrator slope errors also has a substantial performance benefit at high operating temperatures.

Gee, R.; Gaul, H.W.; Kearney, D.; Rabl, A.

1980-03-01T23:59:59.000Z

43

2 Technology Description: Solar Thermal Parabolic Trough Solar Thermal  

E-Print Network (OSTI)

– Parabolic troughs track sun, concentrate incident light onto a centralized, tubular receiver that runs length of each trough – Thermal fluid circulates through all receivers in solar field – Thermal fluid brought to one or more centralized power production facilities – Heat transferred to a steam cycle, drives a steam turbine to generate power – Cooled thermal fluid is then recirculated th through h solar fi field ld – Wet cooling is common, dry cooling possible

Timothy J. Skone; Risks Of Implementation

2012-01-01T23:59:59.000Z

44

Executive Summary: Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts  

DOE Green Energy (OSTI)

Sargent& Lundy LLC conducted an independent analysis of parabolic trough and power tower solar technology cost and performance.

Not Available

2003-10-01T23:59:59.000Z

45

Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts  

DOE Green Energy (OSTI)

Sargent and Lundy LLC conducted an independent analysis of parabolic trough and power tower solar technology cost and performance.

Not Available

2003-10-01T23:59:59.000Z

46

Parabolic Trough Solar Power for Competitive U.S. Markets  

DOE Green Energy (OSTI)

Nine parabolic trough power plants located in the California Mojave Desert represent the only commercial development of large-scale solar power plants to date. Although all nine plants continue to operate today, no new solar power plants have been completed since 1990. Over the last several years, the parabolic trough industry has focused much of its efforts on international market opportunities. Although the power market in developing countries appears to offer a number of opportunities for parabolic trough technologies due to high growth and the availability of special financial incentives for renewables, these markets are also plagued with many difficulties for developers. In recent years, there has been some renewed interest in the U.S. domestic power market as a result of an emerging green market and green pricing incentives. Unfortunately, many of these market opportunities and incentives focus on smaller, more modular technologies (such as photovoltaics or wind power), and as a result they tend to exclude or are of minimum long-term benefit to large-scale concentrating solar power technologies. This paper looks at what is necessary for large-scale parabolic trough solar power plants to compete with state-of-the-art fossil power technology in a competitive U.S. power market.

Henry W. Price

1998-11-01T23:59:59.000Z

47

PARABOLIC TROUGH SOLAR POWER FOR COMPETITIVE U.S. MARKETS  

E-Print Network (OSTI)

Nine parabolic trough power plants located in the California Mojave Desert represent the only commercial development of large-scale solar power plants to date. Although all nine plants continue to operate today, no new solar power plants have been completed since 1990. Over the last several years, the parabolic trough industry has focused much of its efforts on international market opportunities. Although the power market in developing countries appears to offer a number of opportunities for parabolic trough technologies due to high growth and the availability of special financial incentives for renewables, these markets are also plagued with many difficulties for developers. In recent years, there has been some renewed interest in the U.S. domestic power market as a result of an emerging green market and green pricing incentives. Unfortunately, many of these market opportunities and incentives focus on smaller, more modular technologies (such as photovoltaics or wind power), and as a result they tend to exclude or are of minimum long-term benefit to large-scale concentrating solar power technologies. This paper looks at what is necessary for large-scale parabolic trough solar power plants to compete with state-of-the-art fossil power technology in a competitive U.S. power market.

Henry W. Price; Maui Hawaii; Henry W. Price; Rainer Kistner

1998-01-01T23:59:59.000Z

48

Flux Distribution of a Single-Axis Tracking Parabolic Trough Array with Photovoltaic Receiver  

E-Print Network (OSTI)

Flux Distribution of a Single-Axis Tracking Parabolic Trough Array with Photovoltaic Receiver G 0200 Australia E-mail: gregory.burgess@anu.edu.au Abstract Single-axis tracking parabolic troughs Long arrays of single-axis tracking parabolic troughs with a fluid filled absorber are a well

49

Mean wind forces on parabolic-trough solar collectors  

DOE Green Energy (OSTI)

The purpose of this study was to investigate characteristics of mean wind loads produced by airflow in and around several configurations of parabolic trough solar collectors with and without a wind fence. Four basic parabolic shapes were investigated as single units and one shape was studied as part of several array fields. One 1:25 scale model of each parabolic shape was constructed for mounting on a force balance to measure two forces and three moments. The effects of several dominant variables were investigated in this study: wind-azimuth (or yaw), trough elevation (or pitch) angle, array field configuration, and protective wind fence characteristics. All measurements were made in a boundary-layer flow developed by the meteorological wind tunnel at the Fluid Dynamics and Diffusion Laboratory of Colorado State University. Results are presented and discussed. (WHK)

Peterka, J.A.; Sinau, J.M.; Cermak, J.E.

1980-05-01T23:59:59.000Z

50

NREL: TroughNet - Parabolic Trough Technology Models and Software Tools  

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

Technology Models and Software Tools Technology Models and Software Tools Here you'll find information about models and software tools used to analyze parabolic trough power plant technology. They include: Annual Simulation Solar Advisor Model TRNSYS Other Analysis SolTRACE Receiver Model DView JEDI Annual Simulation Software Because solar power plants rely on an intermittent fuel supply-the sun-it is necessary to model the plant's performance on an hourly (or finer resolution) basis to understand and predict its annual performance. A number of performance and economics models are available for evaluating parabolic trough solar technologies. Industry also has developed a number of proprietary models for evaluating parabolic trough plants. Solar Advisor Model NREL, partnering with the U.S. Department of Energy's Solar Energy

51

Parabolic-Trough Technology Roadmap: A Pathway for Sustained Commercial Development and Deployment of Parabolic-Trough Technology  

DOE Green Energy (OSTI)

Technology roadmapping is a needs-driven technology planning process to help identify, select, and develop technology alternatives to satisfy a set of market needs. The DOE's Office of Power Technologies' Concentrating Solar Power (CSP) Program recently sponsored a technology roadmapping workshop for parabolic trough technology. The workshop was attended by an impressive cross section of industry and research experts. The goals of the workshop were to evaluate the market potential for trough power projects, develop a better understanding of the current state of the technology, and to develop a conceptual plan for advancing the state of parabolic trough technology. This report documents and extends the roadmap that was conceptually developed during the workshop.

Price, H.; Kearney, D.

1999-01-31T23:59:59.000Z

52

Gas Turbine/Solar Parabolic Trough Hybrid Designs: Preprint  

DOE Green Energy (OSTI)

A strength of parabolic trough concentrating solar power (CSP) plants is the ability to provide reliable power by incorporating either thermal energy storage or backup heat from fossil fuels. Yet these benefits have not been fully realized because thermal energy storage remains expensive at trough operating temperatures and gas usage in CSP plants is less efficient than in dedicated combined cycle plants. For example, while a modern combined cycle plant can achieve an overall efficiency in excess of 55%; auxiliary heaters in a parabolic trough plant convert gas to electricity at below 40%. Thus, one can argue the more effective use of natural gas is in a combined cycle plant, not as backup to a CSP plant. Integrated solar combined cycle (ISCC) systems avoid this pitfall by injecting solar steam into the fossil power cycle; however, these designs are limited to about 10% total solar enhancement. Without reliable, cost-effective energy storage or backup power, renewable sources will struggle to achieve a high penetration in the electric grid. This paper describes a novel gas turbine / parabolic trough hybrid design that combines solar contribution of 57% and higher with gas heat rates that rival that for combined cycle natural gas plants. The design integrates proven solar and fossil technologies, thereby offering high reliability and low financial risk while promoting deployment of solar thermal power.

Turchi, C. S.; Ma, Z.; Erbes, M.

2011-03-01T23:59:59.000Z

53

Absorber Alignment Measurement Tool for Solar Parabolic Trough Collectors: Preprint  

DOE Green Energy (OSTI)

As we pursue efforts to lower the capital and installation costs of parabolic trough solar collectors, it is essential to maintain high optical performance. While there are many optical tools available to measure the reflector slope errors of parabolic trough solar collectors, there are few tools to measure the absorber alignment. A new method is presented here to measure the absorber alignment in two dimensions to within 0.5 cm. The absorber alignment is measured using a digital camera and four photogrammetric targets. Physical contact with the receiver absorber or glass is not necessary. The alignment of the absorber is measured along its full length so that sagging of the absorber can be quantified with this technique. The resulting absorber alignment measurement provides critical information required to accurately determine the intercept factor of a collector.

Stynes, J. K.; Ihas, B.

2012-04-01T23:59:59.000Z

54

A Linear Parabolic Trough Solar Collector Performance Model  

E-Print Network (OSTI)

A performance model has been programmed for solar thermal collector based on a linear, tracking parabolic trough reflector focused on a surface-treated metallic pipe receiver enclosed in an evacuated transparent tube: a Parabolic Trough Solar Collector (PTSC). This steady state, single dimensional model comprises the fundamental radiative and convective heat transfer and mass and energy balance relations programmed in the Engineering Equation Solver, EES. It considers the effects of solar intensity and incident angle, collector dimensions, material properties, fluid properties, ambient conditions, and operating conditions on the performance of the collector: the PTSC. Typical performance calculations show that when hot-water at 165C flows through a 6m by 2.3m PTSC with 900 w/m^2 solar insulation and 0 incident angle, the estimated collector efficiency is about 55% The model predictions will be confirmed by the operation of PTSCs now being installed at Carnegie Mellon.

Qu, M.; Archer, D.; Masson, S.

2006-01-01T23:59:59.000Z

55

Parabolic Trough Solar Power Plant Simulation Model: Preprint  

DOE Green Energy (OSTI)

As interest for clean renewable electric power technologies grows, a number of parabolic trough power plants of various configurations are being considered for deployment around the globe. It is essential that plant designs be optimized for each specific application. The optimum design must consider the capital cost, operations and maintenance cost, annual generation, financial requirements, and time-of-use value of the power generated. Developers require the tools for evaluating tradeoffs between these various project elements. This paper provides an overview of a computer model that is being used by scientists and developers to evaluate the tradeoff between cost, performance, and economic parameters for parabolic trough solar power plant technologies. An example is included that shows how this model has been used for a thermal storage design optimization.

Price, H.

2003-01-01T23:59:59.000Z

56

Development effort of sheet molding compound (SMC) parabolic trough panels  

SciTech Connect

The objectives of the development effort are to: investigate the problems of molding parabolic trough solar reflector panels of sheet molding compound (SMC); develop molding techniques and processes by which silvered glass reflector sheets can be integrally molded into SMC trough panels; provide representative prototype panels for evaluation; and provide information regarding the technical feasibility of molding SMC panels in high volume production. The approach taken to meet the objectives was to design the parabolic panel, fabricate a prototype die, choose an SMC formulation and mold the glass and SMC together into a vertex to rim mirrored panel. The main thrust of the program was to successfully co-mold a mirrored glass sheet with the SMC. Results indicate that mirrored glass sheets, if properly strengthened to withstand the temperature and pressure of the molding process, can be successfully molded with SMC in a single press stroke using standard compression molding techniques. The finalized design of the trough panel is given. The SMC formulation chosen is a low shrink, low profile SMC using 40% by weight one inch chopped glass fibers in a uv stabilized polyester resin matrix. A program to test for the adhesion between mirrored glass sheets and the SMC is discussed briefly. (LEW)

Kirsch, P.A.; Champion, R.L.

1982-01-01T23:59:59.000Z

57

NREL: TroughNet - Parabolic Trough Technology Solar Resource Data and Tools  

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

Solar Resource Data and Tools Solar Resource Data and Tools Here you'll find resources on solar radiation data and tools for siting parabolic trough power plants. This includes solar radiation data for power plants in the United States and worldwide. You'll also find resources for direct solar radiation instrumentation. For an overview on solar resource terms and direct beam radiation used for concentrating solar power technologies, see NREL's Shining On Web site. U.S. Solar Radiation Resource Data The following resources include maps, and hourly metrological and solar resource data for parabolic trough power plants sites in the United States. NREL Concentrating Solar Power Resource Maps Features direct normal solar radiation maps of the southwestern United States, including state maps for Arizona, California, Colorado, New Mexico,

58

Video Scanning Hartmann Optical Testing of State-of-the-Art Parabolic Trough Concentrators: Preprint  

DOE Green Energy (OSTI)

This paper describes the Video Scanning Hartmann Optical Test System (VSHOT) used to optically test parabolic trough designs by both Solargenix and Industrial Solar Technology.

Wendelin, T.; May, K.; Gee, R.

2006-06-01T23:59:59.000Z

59

NaNO3-KNO3 Ternary Molten Salts for Parabolic Trough  

Science Conference Proceedings (OSTI)

Presentation Title, Thermodynamic Properties of Novel Low Melting Point LiNO3- NaNO3-KNO3 Ternary Molten Salts for Parabolic Trough Solar Power ...

60

Two-tank indirect thermal storage designs for solar parabolic trough power plants.  

E-Print Network (OSTI)

??The performance of a solar thermal parabolic trough plant with thermal storage is dependent upon the arrangement of the heat exchangers that ultimately transfer energy… (more)

Kopp, Joseph E.

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Mechanical development of the actuation system of a parabolic solar trough.  

E-Print Network (OSTI)

??This thesis documents my personal contribution to the engineering and design of an actuation system with the purpose of rotating a parabolic solar trough to… (more)

O'Rourke, Conor R. (Conor Rakis)

2011-01-01T23:59:59.000Z

62

Technical and economic analysis of parabolic trough concentrating solar thermal power plant.  

E-Print Network (OSTI)

??Includes abstract. This thesis reports on the technical and economic analysis of wet and dry cooling technologies of parabolic trough CSTP plant. This was done… (more)

Kariuki, Kibaara Samuel .

2012-01-01T23:59:59.000Z

63

Parabolic Trough Solar System Piping Model: Final Report, 13 May 2002 ? 31 December 2004  

DOE Green Energy (OSTI)

Subcontract report by Nexant, Inc., and Kearny and Associates regarding a study of a piping model for a solar parabolic trough system.

Kelly, B.; Kearney, D.

2006-07-01T23:59:59.000Z

64

Parabolic trough collector systems for thermal enhanced oil recovery  

SciTech Connect

Enhanced Oil Recovery (EOR) techniques offer a means of increasing US oil production by recovering oil otherwise unavailable when using primary or secondary production methods. The use of parabolic trough collector solar energy systems can expand the production of oil recovered by the most prevalent of these techniques, thermal EOR, by improving the economics and lessening the environmental impacts. These collector systems, their state of development, their application to EOR, and their capacity for expanding oil production are reviewed. An economic analysis which shows that these systems will meet investment hurdle rates today is also presented.

Niemeyer, W.A.; Youngblood, S.B.; Price, A.L.

1981-01-01T23:59:59.000Z

65

Mechanism of Hydrogen Formation in Solar Parabolic Trough Receivers  

SciTech Connect

Solar parabolic trough systems for electricity production are receiving renewed attention, and new solar plants are under construction to help meet the growing demands of the power market in the Western United States. The growing solar trough industry will rely on operating experience it has gained over the last two decades. Recently, researchers found that trough plants that use organic heat transfer fluids (HTF) such as Therminol VP-1 are experiencing significant heat losses in the receiver tubes. The cause has been traced back to the accumulation of excess hydrogen gas in the vacuum annulus that surrounds the steel receiver tube, thus compromising the thermal insulation of the receiver. The hydrogen gas is formed during the thermal decomposition of the organic HTF that circulates inside the receiver loop, and the installation of hydrogen getters inside the annulus has proven to be insufficient for controlling the hydrogen build-up over the lifetime of the receivers. This paper will provide an overview of the chemical literature dealing with the thermal decomposition of diphenyl oxide and biphenyl, the two constituents of Therminol VP-1.

Moens, L.; Blake, D. M.

2008-03-01T23:59:59.000Z

66

The parabolic trough power plants Andasol 1 to 3 The largest solar power plants in the world  

E-Print Network (OSTI)

The parabolic trough power plants Andasol 1 to 3 The largest solar power plants in the world and solar-thermal power plants The first parabolic trough power plants in Europe ­ the world's largest solar

Laughlin, Robert B.

67

Test results, Industrial Solar Technology parabolic trough solar collector  

DOE Green Energy (OSTI)

Sandia National Laboratories and Industrial Solar Technology are cost-sharing development of advanced parabolic trough technology. As part of this effort, several configurations of an IST solar collector were tested to determine the collector efficiency and thermal losses with black chrome and black nickel receiver selective coatings, combined with aluminized film and silver film reflectors, using standard Pyrex{reg_sign} and anti-reflective coated Pyrex{reg_sign} glass receiver envelopes. The development effort has been successful, producing an advanced collector with 77% optical efficiency, using silver-film reflectors, a black nickel receiver coating, and a solgel anti-reflective glass receiver envelope. For each receiver configuration, performance equations were empirically derived relating collector efficiency and thermal losses to the operating temperature. Finally, equations were derived showing collector performance as a function of input insolation value, incident angle, and operating temperature.

Dudley, V.E. [EG and G MSI, Albuquerque, NM (United States); Evans, L.R.; Matthews, C.W. [Sandia National Labs., Albuquerque, NM (United States)

1995-11-01T23:59:59.000Z

68

Heat-Loss Testing of Solel's UVAC3 Parabolic Trough Receiver  

DOE Green Energy (OSTI)

For heat-loss testing on two Solel UVAC3 parabolic trough receivers, a correlation developed predicts receiver heat loss as a function of the difference between avg absorber and ambient temperatures.

Burkholder, F.; Kutscher, C.

2008-01-01T23:59:59.000Z

69

Wind Tunnel Tests of Parabolic Trough Solar Collectors: March 2001--August 2003  

DOE Green Energy (OSTI)

Conducted extensive wind-tunnel tests on parabolic trough solar collectors to determine practical wind loads applicable to structural design for stress and deformation, and local component design for concentrator reflectors.

Hosoya, N.; Peterka, J. A.; Gee, R. C.; Kearney, D.

2008-05-01T23:59:59.000Z

70

Mechanical development of the actuation system of a parabolic solar trough  

E-Print Network (OSTI)

This thesis documents my personal contribution to the engineering and design of an actuation system with the purpose of rotating a parabolic solar trough to track the sun throughout the day. The primary focus of the design ...

O'Rourke, Conor R. (Conor Rakis)

2011-01-01T23:59:59.000Z

71

Optical analysis and optimization of parabolic-trough collectors: a user's guide  

DOE Green Energy (OSTI)

The results of a detailed optical analysis of parabolic trough solar collectors are summarized by a few universal graphs and curve fits. These graphs enable the designer of parabolic trough collectors to calculate the performance and to optimize the design with a simple hand calculator. The method is illustrated by specific examples that are typical of practical applications. The sensitivity of the optimization to changes in collector parameters and operating conditions is evaluated.

Bendt, P.; Rabl, A.; Gaul, H.W.

1981-07-01T23:59:59.000Z

72

LINSOL: a model for predicting the optical performance of parabolic trough solar thermal systems  

DOE Green Energy (OSTI)

A detailed model has been developed to predict the optical performance of parabolic trough solar energy systems. The model is one to two orders of magnitude faster than previous, less complete calculations and makes tractable investigation of a wide range of design and application alternatives for trough systems. Representative results are presented that show the dependence of the trough optical performance on field orientation and site latitude.

Dellin, T.A.

1981-01-01T23:59:59.000Z

73

Analysis of the influence of geography and weather on parabolic trough solar collector design  

DOE Green Energy (OSTI)

The potential performance of single-axis tracking parabolic trough solar collectors as a function of optical energy distribution and receiver size has been calculated for eleven sites using typical meteorological year input data. A simulation based on the SOLTES code was developed which includes the three-dimensional features of a parabolic trough and calculates the thermooptical tradeoffs. The capability of the thermooptical model has been confirmed by the comparison of calculated results with the experimental results from an all-day test of a parabolic trough. The results from this eleven-site analysis indicate a potential performance superiority of a north-south horizontal axis trough and, in addition, a high quality (optical error, sigma/sub system/ less than or equal to 0.007 radian) collector should be of the same geometric design for all of the sites investigated and probably for all regions of the country.

Treadwell, G.W.; Grandjean, N.R.; Biggs, F.

1980-03-01T23:59:59.000Z

74

FirstOPTIC Software Package for Parabolic Trough Evaluation  

power (CSP) technologies used in commercial utility-scale power generation plants. A key param­eter for trough performance evaluation is the collector ...

75

Gas Turbine/Solar Parabolic Trough Hybrid Design Using Molten Salt Heat Transfer Fluid: Preprint  

DOE Green Energy (OSTI)

Parabolic trough power plants can provide reliable power by incorporating either thermal energy storage (TES) or backup heat from fossil fuels. This paper describes a gas turbine / parabolic trough hybrid design that combines a solar contribution greater than 50% with gas heat rates that rival those of natural gas combined-cycle plants. Previous work illustrated benefits of integrating gas turbines with conventional oil heat-transfer-fluid (HTF) troughs running at 390?C. This work extends that analysis to examine the integration of gas turbines with salt-HTF troughs running at 450 degrees C and including TES. Using gas turbine waste heat to supplement the TES system provides greater operating flexibility while enhancing the efficiency of gas utilization. The analysis indicates that the hybrid plant design produces solar-derived electricity and gas-derived electricity at lower cost than either system operating alone.

Turchi, C. S.; Ma, Z.

2011-08-01T23:59:59.000Z

76

Validation of the FLAGSOL parabolic trough solar power plant performance model  

DOE Green Energy (OSTI)

This paper describes the results of a validation of the FLAGSOL parabolic trough solar power plant performance model. The validation was accomplished by simulating an operating solar electric generating system (SEGS) parabolic trough solar thermal power plant and comparing the model output results with actual plant operating data. This comparison includes instantaneous, daily, and annual total solar thermal electric output, gross solar electric generation, and solar mode parasitic electric consumption. The results indicate that the FLAGSOL model adequately predicts the gross solar electric output of an operating plant, both on a daily and an annual basis.

Price, H.W. [National Renewable Energy Lab., Golden, CO (United States); Svoboda, P. [Flachglas-Solartechnik GmbH, Koeln (Germany); Kearney, D. [Kearney and Associates, Del Mar, CA (United States)

1994-10-01T23:59:59.000Z

77

Determination of freeze-protection heat loss from a parabolic trough solar system  

DOE Green Energy (OSTI)

A small-scale experiment was undertaken to determine practical control temperatures for a parabolic trough, pulsed-flow water freeze-protection scheme. Measurements were also taken of heat loss from stagnant water in the absorber tube under freezing ambient conditions. Using the experimental data and data available from the literature, manipulation of long-term weather data provided estimates of annual thermal losses to prevent freezing. In a cold climate such as Denver, Colorado's, which typically has 155 freezing days per year, such losses should be less than 0.7% of the annual energy delivered by an efficient parabolic trough system.

May, E.K.

1983-08-01T23:59:59.000Z

78

Nexant Parabolic Trough Solar Power Plant Systems Analysis; Task 3: Multiple Plants at a Common Location, 20 January 2005 - 31 December 2005  

DOE Green Energy (OSTI)

Subcontract report by Nexant, Inc., regarding a system analysis of multiple solar parabolic trough plants at a common location.

Kelly, B.

2006-07-01T23:59:59.000Z

79

hal-00177601,version2-30Oct2007 A closed parabolic trough solar collector  

E-Print Network (OSTI)

issues that must be dealt with. The most important one is the receiver tube that absorbs the solar energy partially evacuated tube that is filled by a low-conductivity gas. While reducing the cost, this design also of parabolic trough for solar power plants is the one developed by the now defunct Luz during 1980s. The common

Paris-Sud XI, Université de

80

Analytical Approach Treating Three-Dimensional Geometrical Effects of Parabolic Trough Collectors: Preprint  

DOE Green Energy (OSTI)

An analytical approach, as an extension of one newly developed method -- First-principle OPTical Intercept Calculation (FirstOPTIC) -- is proposed to treat the geometrical impact of three-dimensional (3-D) effects on parabolic trough optical performance. The mathematical steps of this analytical approach are presented and implemented numerically as part of the suite of FirstOPTIC code. In addition, the new code has been carefully validated against ray-tracing simulation results and available numerical solutions. This new analytical approach to treating 3-D effects will facilitate further understanding and analysis of the optical performance of trough collectors as a function of incidence angle.

Binotti, M.; Zhu, G.; Gray, A.; Manzollini, G.

2012-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Near-term improvements in parabolic troughs: an economic and performance assessment  

DOE Green Energy (OSTI)

Improved parabolic-trough concentrating collectors will result from better design, improved fabrication techniques, and the development and utilization of improved materials. This analysis qualifies the performance potential of various parabolic-trough component improvements from a systems viewpoint and uses these performance data to determine the worth of each improvement on an economic basis. The improvements considered are evacuated receivers, silvered-glass reflectors, improved receiver, selective coatings, higher optical accuracy concentrations, and higher transmittance receiver glazings. Upper-bound costs for each improvement are provided as well as estimates of the increased solar system rates of return that are made possible by these improvements. The performance and economic potential of some of these improvements are shown to be substantial, especially at higher collector operating temperatures.

Gee, R.; Murphy, L.M.

1981-08-01T23:59:59.000Z

82

Reducing the Cost of Energy from Parabolic Trough Solar Power Plants: Preprint  

DOE Green Energy (OSTI)

Parabolic trough solar technology is the most proven and lowest cost large-scale solar power technology available today, primarily because of the nine large commercial-scale solar power plants that are operating in the California Mojave Desert. However, no new plants have been built during the past ten years because the cost of power from these plants is more expensive than power from conventional fossil fuel power plants. This paper reviews the current cost of energy and the potential for reducing the cost of energy from parabolic trough solar power plant technology based on the latest technological advancements and projected improvements from industry and sponsored R&D. The paper also looks at the impact of project financing and incentives on the cost of energy.

Price, H.; Kearney, D.

2003-01-01T23:59:59.000Z

83

Heat Transfer Analysis and Modeling of a Parabolic Trough Solar Receiver Implemented in Engineering Equation Solver  

DOE Green Energy (OSTI)

This report describes the development, validation, and use of a heat transfer model implemented in Engineering Equation Solver. The model determines the performance of a parabolic trough solar collector's linear receiver, also called a heat collector element. All heat transfer and thermodynamic equations, optical properties, and parameters used in the model are discussed. The modeling assumptions and limitations are also discussed, along with recommendations for model improvement.

Forristall, R.

2003-10-01T23:59:59.000Z

84

Slope Error Measurement Tool for Solar Parabolic Trough Collectors: Preprint  

DOE Green Energy (OSTI)

The National Renewable Energy Laboratory (NREL) has developed an optical measurement tool for parabolic solar collectors that measures the combined errors due to absorber misalignment and reflector slope error. The combined absorber alignment and reflector slope errors are measured using a digital camera to photograph the reflected image of the absorber in the collector. Previous work using the image of the reflection of the absorber finds the reflector slope errors from the reflection of the absorber and an independent measurement of the absorber location. The accuracy of the reflector slope error measurement is thus dependent on the accuracy of the absorber location measurement. By measuring the combined reflector-absorber errors, the uncertainty in the absorber location measurement is eliminated. The related performance merit, the intercept factor, depends on the combined effects of the absorber alignment and reflector slope errors. Measuring the combined effect provides a simpler measurement and a more accurate input to the intercept factor estimate. The minimal equipment and setup required for this measurement technique make it ideal for field measurements.

Stynes, J. K.; Ihas, B.

2012-04-01T23:59:59.000Z

85

Material and process screening as applied to a reinforced plastic parabolic trough concentrator module  

DOE Green Energy (OSTI)

Existing parabolic trough solar collectors are basically sheet metal designs utilizing aluminum or steel as the major structural materials. The relatively high labor content associated with these sheet metal designs has generated an interest in investigating the cost effectiveness of using reinforced plastics as a major structural material for trough solar collectors. This interest is bolstered by a growing desire on the part of industry to identify new material-process combinations which save weight, use less energy, and require less capital equipment and assembly costs. The use of reinforced plastics as the basic material for a line-focus parabolic trough concentrator module is studied. This module constitutes a basic building block with which longer trough rows can be built. The basic part analysis is described including the quantification of key material and part-function relationships. In addition candidate materials and processes are reviewed and, the costs associated with the most attractive combinations defined. Finally, the major conclusions and recommendations are summarized.

Hodge, R. (ed.)

1980-08-01T23:59:59.000Z

86

Modeling of a Parabolic Trough Solar Field for Acceptance Testing: A Case Study  

DOE Green Energy (OSTI)

As deployment of parabolic trough concentrating solar power (CSP) systems ramps up, the need for reliable and robust performance acceptance test guidelines for the solar field is also amplified. Project owners and/or EPC contractors often require extensive solar field performance testing as part of the plant commissioning process in order to ensure that actual solar field performance satisfies both technical specifications and performance guaranties between the involved parties. Performance test code work is currently underway at the National Renewable Energy Laboratory (NREL) in collaboration with the SolarPACES Task-I activity, and within the ASME PTC-52 committee. One important aspect of acceptance testing is the selection of a robust technology performance model. NREL1 has developed a detailed parabolic trough performance model within the SAM software tool. This model is capable of predicting solar field, sub-system, and component performance. It has further been modified for this work to support calculation at subhourly time steps. This paper presents the methodology and results of a case study comparing actual performance data for a parabolic trough solar field to the predicted results using the modified SAM trough model. Due to data limitations, the methodology is applied to a single collector loop, though it applies to larger subfields and entire solar fields. Special consideration is provided for the model formulation, improvements to the model formulation based on comparison with the collected data, and uncertainty associated with the measured data. Additionally, this paper identifies modeling considerations that are of particular importance in the solar field acceptance testing process and uses the model to provide preliminary recommendations regarding acceptable steady-state testing conditions at the single-loop level.

Wagner, M. J.; Mehos, M. S.; Kearney, D. W.; McMahan, A. C.

2011-01-01T23:59:59.000Z

87

NREL: Concentrating Solar Power Research - TroughNet Home Page  

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

Site Map TroughNet is a technical resource for evaluation of parabolic trough solar power plant technologies. Parabolic Trough Technology Parabolic trough solar technology offers...

88

Current and Future Costs for Parabolic Trough and Power Tower Systems in the US Market: Preprint  

DOE Green Energy (OSTI)

NREL's Solar Advisor Model (SAM) is employed to estimate the current and future costs for parabolic trough and molten salt power towers in the US market. Future troughs are assumed to achieve higher field temperatures via the successful deployment of low melting-point, molten-salt heat transfer fluids by 2015-2020. Similarly, it is assumed that molten salt power towers are successfully deployed at 100MW scale over the same time period, increasing to 200MW by 2025. The levelized cost of electricity for both technologies is predicted to drop below 11 cents/kWh (assuming a 10% investment tax credit and other financial inputs outlined in the paper), making the technologies competitive in the marketplace as benchmarked by the California MPR. Both technologies can be deployed with large amounts of thermal energy storage, yielding capacity factors as high as 65% while maintaining an optimum LCOE.

Turchi, C.; Mehos, M.; Ho, C. K.; Kolb, G. J.

2010-10-01T23:59:59.000Z

89

Current and future costs for parabolic trough and power tower systems in the US market.  

SciTech Connect

NREL's Solar Advisor Model (SAM) is employed to estimate the current and future costs for parabolic trough and molten salt power towers in the US market. Future troughs are assumed to achieve higher field temperatures via the successful deployment of low melting-point, molten-salt heat transfer fluids by 2015-2020. Similarly, it is assumed that molten salt power towers are successfully deployed at 100MW scale over the same time period, increasing to 200MW by 2025. The levelized cost of electricity for both technologies is predicted to drop below 11 cents/kWh (assuming a 10% investment tax credit and other financial inputs outlined in the paper), making the technologies competitive in the marketplace as benchmarked by the California MPR. Both technologies can be deployed with large amounts of thermal energy storage, yielding capacity factors as high as 65% while maintaining an optimum LCOE.

Turchi, Craig (National Renewable Energy Laboratory, Golden, CO); Kolb, Gregory J.; Mehos, Mark Steven (National Renewable Energy Laboratory, Golden, CO); Ho, Clifford Kuofei

2010-08-01T23:59:59.000Z

90

Nexant Parabolic Trough Solar Power Plant Systems Analysis; Task 2: Comparison of Wet and Dry Rankine Cycle Heat Rejection, 20 January 2005 - 31 December 2005  

DOE Green Energy (OSTI)

Subcontract report by Nexant, Inc., regarding a system analysis comparing solar parabolic trough plants with wet and dry rankine cycle heat rejection.

Kelly, B.

2006-07-01T23:59:59.000Z

91

Frequency response analysis of fluid control systems for parabolic-trough solar collectors  

DOE Green Energy (OSTI)

A linearized steady-state frequency response is derived for parabolic-trough collectors and for connecting piping that can be used in standard gain-phase analyses to evaluate system stability and closed-loop frequency response. The frequency-response characteristics of a typical collector string and piping are used in a gain-phase analysis to get some insight into the effect on system stability of various system parameters such as controller gain, sensor and controller-time constants, and sensor location.

Schindwolf, R.

1981-07-01T23:59:59.000Z

92

Development effort on sheet-molding compound (SMC) parabolic-trough panels  

SciTech Connect

The approach taken to develop integrally molded reflective glass with sheet molding compound into parabolic trough solar reflectors is described in detail. Results indicate that mirrored glass sheets, if properly strengthened to withstand the temperature and pressure of the molding process, can be successfully molded with sheet molding compound in a single press stroke using standard compression molding techniques. The silver reflective surface must be coated with an adhesive mixture that provides both protection of the silver and adhesion to the sheet molding compound. The sheet molding compound must provide the strength and stiffness required of a structure backing material. (LEW)

Kirsch, P.A.

1982-07-01T23:59:59.000Z

93

Measurement of Hydrogen Purge Rates in Parabolic Trough Receiver Tubes: Preprint  

SciTech Connect

The purpose of this research is to investigate and develop methods to remove hydrogen centrally from commercial parabolic trough power plants. A mathematical model was developed that tracks the generation and transport of hydrogen within an operating plant. Modeling results predicted the steady-state partial pressure of hydrogen within the receiver annuli to be ~1 torr. This result agrees with measured values for the hydrogen partial pressure. The model also predicted the rate at which hydrogen must be actively removed from the expansion tank to reduce the partial pressure of hydrogen within the receiver annuli to less than 0.001 torr. Based on these results, mitigation strategies implemented at operating parabolic trough power plants can reduce hydrogen partial pressure to acceptable levels. Transient modeling predicted the time required to reduce the hydrogen partial pressures within receiver annuli to acceptable levels. The times were estimated as a function of bellows temperature, getter quantity, and getter temperature. This work also includes an experimental effort that will determine the time required to purge hydrogen from a receiver annulus with no getter.

Glatzmaier, G. C.

2010-10-01T23:59:59.000Z

94

Water Use in Parabolic Trough Power Plants: Summary Results from WorleyParsons' Analyses  

DOE Green Energy (OSTI)

The National Renewable Energy Laboratory (NREL) contracted with WorleyParsons Group, Inc. to examine the effect of switching from evaporative cooling to alternative cooling systems on a nominal 100-MW parabolic trough concentrating solar power (CSP) plant. WorleyParsons analyzed 13 different cases spanning three different geographic locations (Daggett, California; Las Vegas, Nevada; and Alamosa, Colorado) to assess the performance, cost, and water use impacts of switching from wet to dry or hybrid cooling systems. NREL developed matching cases in its Solar Advisor Model (SAM) for each scenario to allow for hourly modeling and provide a comparison to the WorleyParsons results.Our findings indicate that switching from 100% wet to 100% dry cooling will result in levelized cost of electricity (LCOE) increases of approximately 3% to 8% for parabolic trough plants throughout most of the southwestern United States. In cooler, high-altitude areas like Colorado's San Luis Valley, WorleyParsons estimated the increase at only 2.5%, while SAM predicted a 4.4% difference. In all cases, the transition to dry cooling will reduce water consumption by over 90%. Utility time-of-delivery (TOD) schedules had similar impacts for wet- and dry-cooled plants, suggesting that TOD schedules have a relatively minor effect on the dry-cooling penalty.

Turchi, C. S.; Wagner, M. J.; Kutscher, C. F.

2010-12-01T23:59:59.000Z

95

An optimized model and test of the China's first high temperature parabolic trough solar receiver  

SciTech Connect

The vacuum solar receiver is the key component of a parabolic trough solar plant, which plays a prominent role in the gross system efficiency. Recently, China's first high temperature vacuum receiver, Sanle-3 HCE, has been developed and produced by Southeast University and Sanle Electronic Group. Before being utilized in China's first parabolic trough solar plant, accurately estimating the thermal properties of this new receiver is important. This paper first establishes and optimizes a 1-D theoretical model at Matlab program to compute the receiver's major heat loss through glass envelope, and then systematically analyzes the major influence factors of heat loss. With the laboratorial steady state test stand, the heat losses of both good vacuum and non-vacuum Sanle-3 receivers were surveyed. Comparison shows the original 1-D model agrees with the ends covered test while remarkably deviating from end exposed test. For the purpose of identifying the influence of receiver's end to total heat loss, an additional 3-D model is built by CFD software to further investigate the different heat transfer processes of receiver's end components. The 3-D end model is verified by heating power and IR temperature distribution images in the test. Combining the optimized 1-D model with the new 3-D end model, the comparison with test data shows a good accordance. At the same time the heat loss curve and emittance curve of this new receiver are given and compared with those of several other existing receivers as references. (author)

Gong, Guangjie; Huang, Xinyan; Wang, Jun; Hao, Menglong [Southeast University, Nanjing (China)

2010-12-15T23:59:59.000Z

96

Survey of Thermal Storage for Parabolic Trough Power Plants; Period of Performance: September 13, 1999 - June 12, 2000  

DOE Green Energy (OSTI)

The purpose of this report is to identify and selectively review previous work done on the evaluation and use of thermal energy storage systems applied to parabolic trough power plants. Appropriate storage concepts and technical options are first discussed, followed by a review of previous work.

Pilkington Solar International GmbH

2000-09-29T23:59:59.000Z

97

Utility-Scale Parabolic Trough Solar Systems: Performance Acceptance Test Guidelines, April 2009 - December 2010  

DOE Green Energy (OSTI)

Prior to commercial operation, large solar systems in utility-size power plants need to pass a performance acceptance test conducted by the engineering, procurement, and construction (EPC) contractor or owners. In lieu of the present absence of ASME or other international test codes developed for this purpose, the National Renewable Energy Laboratory has undertaken the development of interim guidelines to provide recommendations for test procedures that can yield results of a high level of accuracy consistent with good engineering knowledge and practice. The Guidelines contained here are specifically written for parabolic trough collector systems with a heat-transport system using a high-temperature synthetic oil, but the basic principles are relevant to other CSP systems.

Kearney, D.

2011-05-01T23:59:59.000Z

98

Frequency response analysis of fluid control systems for parabolic trough solar collectors  

DOE Green Energy (OSTI)

Previous studies of solar collector fluid control systems have utilized computer simulations of collector and piping dynamics to evaluate stability and response characteristics. To obtain reasonable simulation accuracy requires substantial computer memory and time, and is well beyond the capability of small desk-top computers. Here a linearized steady state frequency response is derived for parabolic trough collectors and for connecting piping, which can be used in standard gain-phase analyses to evaluate system stability and closed loop frequency response. The frequency response characteristics of a typical collector string and piping are used in a gain-phase analysis to get some insight into the effect on system stability of various system parameters such as controller gain, sensor and controller time constants, and sensor location.

Schindwolf, R.

1980-01-01T23:59:59.000Z

99

Cleaning strategies for parabolic-trough solar-collector fields; guidelines for decisions  

DOE Green Energy (OSTI)

This report is intended to assist the owner or operator of a parabolic trough solar collector system to decide on a cleaning strategy (equipment, materials, procedures, and schedules). The guidelines are based on information obtained in past research studies, as well as interviews with vendors and users of cleaning and water treatment equipment. The basic procedure recommended utilizes high pressure portable washing equipment. However, since the cleaning problem is so site-specific, no single, detailed approach can be specified. A systematic procedure for evaluating the particular requirements of a site is therefore given. This will allow the solar energy system operator to develop a cleaning strategy which is cost-effective because it is suited to local conditions.

Bergeron, K.D.; Freese, J.M.

1981-06-01T23:59:59.000Z

100

Development of Performance Acceptance Test Guidelines for Large Commercial Parabolic Trough Solar Fields: Preprint  

DOE Green Energy (OSTI)

Prior to commercial operation, large solar systems in utility-size power plants need to pass a performance acceptance test conducted by the EPC contractor or owners. In lieu of the present absence of engineering code developed for this purpose, NREL has undertaken the development of interim guidelines to provide recommendations for test procedures that can yield results of a high level of accuracy consistent with good engineering knowledge and practice. The fundamental differences between acceptance of a solar power plant and a conventional fossil-fired plant are the transient nature of the energy source and the necessity to utilize an analytical performance model in the acceptance process. These factors bring into play the need to establish methods to measure steady state performance, potential impacts of transient processes, comparison to performance model results, and the possible requirement to test, or model, multi-day performance within the scope of the acceptance test procedure. The power block and BOP are not within the boundaries of this guideline. The current guideline is restricted to the solar thermal performance of parabolic trough systems and has been critiqued by a broad range of stakeholders in CSP development and technology.

Kearney, D.; Mehos, M.

2010-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

NREL Develops New Optical Evaluation Approach for Parabolic Trough Collectors (Fact Sheet)  

DOE Green Energy (OSTI)

New analytical method makes it possible to carry out fast evaluation of trough collectors for design purposes.

Not Available

2012-08-01T23:59:59.000Z

102

High concentration two-stage optics for parabolic trough solar collectors with tubular absorber and large rim angle  

SciTech Connect

A new two-stage optical design is proposed for parabolic trough solar collectors with tubular absorbers. It can boost the concentration ratio by a factor of 2.5 relative to the conventional design, while maintaining the large rim angles (i.e., low nominal f-numbers) that are desirable for practical and economical reasons. The second state involves asymmetric nonimaging concentrators of the CPC type, facing segments of the parabolic first stage. The second stage can be accommodated inside an evacuated receiver, allowing the use of first-surface silvered reflectors. The low heat loss of this design opens the possibility of producing steam at temperatures and pressures of conventional power plants, using only one-axis tracking. The improvement in conversion efficiency would be substantial.

Collares-Pereira, M. (Centro para a Conservacao de Energia, Amadora (Portugal)); Gordon, J.M. (Ben Gurion Univ. of the Negev, Beersheva (Israel)); Rabl, A. (Centre d'Energetique, Paris (France)); Winston, R. (Univ. of Chicago, IL (United States))

1991-01-01T23:59:59.000Z

103

Development of Molten-Salt Heat Transfer Fluid Technology for Parabolic Trough Solar Power Plants - Public Final Technical Report  

SciTech Connect

Executive Summary This Final Report for the "Development of Molten-Salt Heat Transfer Fluid (HTF) Technology for Parabolic Trough Solar Power Plants” describes the overall project accomplishments, results and conclusions. Phase 1 analyzed the feasibility, cost and performance of a parabolic trough solar power plant with a molten salt heat transfer fluid (HTF); researched and/or developed feasible component options, detailed cost estimates and workable operating procedures; and developed hourly performance models. As a result, a molten salt plant with 6 hours of storage was shown to reduce Thermal Energy Storage (TES) cost by 43.2%, solar field cost by 14.8%, and levelized cost of energy (LCOE) by 9.8% - 14.5% relative to a similar state-of-the-art baseline plant. The LCOE savings range met the project’s Go/No Go criteria of 10% LCOE reduction. Another primary focus of Phase 1 and 2 was risk mitigation. The large risk areas associated with a molten salt parabolic trough plant were addressed in both Phases, such as; HTF freeze prevention and recovery, collector components and piping connections, and complex component interactions. Phase 2 analyzed in more detail the technical and economic feasibility of a 140 MWe,gross molten-salt CSP plant with 6 hours of TES. Phase 2 accomplishments included developing technical solutions to the above mentioned risk areas, such as freeze protection/recovery, corrosion effects of applicable molten salts, collector design improvements for molten salt, and developing plant operating strategies for maximized plant performance and freeze risk mitigation. Phase 2 accomplishments also included developing and thoroughly analyzing a molten salt, Parabolic Trough power plant performance model, in order to achieve the project cost and performance targets. The plant performance model and an extensive basic Engineering, Procurement, and Construction (EPC) quote were used to calculate a real levelized cost of energy (LCOE) of 11.50¢/kWhe , which achieved the Phase 2 Go/No Go target of less than 0.12¢/kWhe. Abengoa Solar has high confidence that the primary risk areas have been addressed in the project and a commercial plant utilizing molten salt is economically and technically feasible. The strong results from the Phase 1 and 2 research, testing, and analyses, summarized in this report, led Abengoa Solar to recommend that the project proceed to Phase 3. However, a commercially viable collector interconnection was not fully validated by the end of Phase 2, combined with the uncertainty in the federal budget, forced the DOE and Abengoa Solar to close the project. Thus the resources required to construct and operate a molten salt pilot plant will be solely supplied by Abengoa Solar.

Grogan, Dylan C. P.

2013-08-15T23:59:59.000Z

104

Error analysis of motion transmission mechanisms : design of a parabolic solar trough.  

E-Print Network (OSTI)

??This thesis presents the error analysis pertaining to the design of an innovative solar trough for use in solar thermal energy generation fields. The research… (more)

Koniski, Cyril (Cyril A.)

2009-01-01T23:59:59.000Z

105

New Optical Evaluation Approach for Parabolic Trough Collectors: First-Principle OPTical Intercept Calculation  

SciTech Connect

A new analytical method -- First-principle OPTical Intercept Calculation (FirstOPTIC) -- is presented here for optical evaluation of trough collectors. It employs first-principle optical treatment of collector optical error sources and derives analytical mathematical formulae to calculate the intercept factor of a trough collector. A suite of MATLAB code is developed for FirstOPTIC and validated against theoretical/numerical solutions and ray-tracing results. It is shown that FirstOPTIC can provide fast and accurate calculation of intercept factors of trough collectors. The method makes it possible to carry out fast evaluation of trough collectors for design purposes. The FirstOPTIC techniques and analysis may be naturally extended to other types of CSP technologies such as linear-Fresnel collectors and central-receiver towers.

Zhu, G.; Lewandowski, A.

2012-11-01T23:59:59.000Z

106

Mechanical development of an actuation system for a parabolic solar trough collector  

E-Print Network (OSTI)

This thesis documents my personal contribution to the development of a hydraulic-based actuation system for a solar trough collector. The goal of this project was to design the actuation system using hydraulic actuators ...

Carrillo, Juan Felipe (Carrillo Salazar)

2013-01-01T23:59:59.000Z

107

Design and analysis of hydraulically driven actuation system For a parabolic solar trough  

E-Print Network (OSTI)

This thesis documents Katarina Popovic's contribution to the design of hydraulic cylinder actuation system for day to day solar trough sun tracking, a semester long project within 2.752 Development of Mechanical Products ...

Popovi?, Katarina, S.B. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

108

Error analysis of motion transmission mechanisms : design of a parabolic solar trough  

E-Print Network (OSTI)

This thesis presents the error analysis pertaining to the design of an innovative solar trough for use in solar thermal energy generation fields. The research was a collaborative effort between Stacy Figueredo from Prof. ...

Koniski, Cyril (Cyril A.)

2009-01-01T23:59:59.000Z

109

Systematic rotation and receiver-location error effects on parabolic-trough annual performance  

DOE Green Energy (OSTI)

The effects of certain systematic errors on performance and, therefore, their influence on the design of troughs are studied. The technique for calculating the influence of systematic errors on performance is outlined and methods for identifying and minimizing these errors are suggested.

Treadwell, G.W.; Grandjean, N.R.

1981-04-01T23:59:59.000Z

110

NREL: TroughNet - Publications  

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

trough power plants by the following topics: Parabolic trough technology Solar field Thermal energy storage Power plant systems Research and development Market and economic...

111

Life Cycle Assessment of a Parabolic Trough Concentrating Solar Power Plant and Impacts of Key Design Alternatives: Preprint  

DOE Green Energy (OSTI)

Climate change and water scarcity are important issues for today's power sector. To inform capacity expansion decisions, hybrid life cycle assessment is used to evaluate a reference design of a parabolic trough concentrating solar power (CSP) facility located in Daggett, California, along four sustainability metrics: life cycle greenhouse gas (GHG) emissions, water consumption, cumulative energy demand (CED), and energy payback time (EPBT). This wet-cooled, 103 MW plant utilizes mined nitrate salts in its two-tank, thermal energy storage (TES) system. Design alternatives of dry-cooling, a thermocline TES, and synthetically-derived nitrate salt are evaluated. During its life cycle, the reference CSP plant is estimated to emit 26 g CO2eq per kWh, consume 4.7 L/kWh of water, and demand 0.40 MJeq/kWh of energy, resulting in an EPBT of approximately 1 year. The dry-cooled alternative is estimated to reduce life cycle water consumption by 77% but increase life cycle GHG emissions and CED by 8%. Synthetic nitrate salts may increase life cycle GHG emissions by 52% compared to mined. Switching from two-tank to thermocline TES configuration reduces life cycle GHG emissions, most significantly for plants using synthetically-derived nitrate salts. CSP can significantly reduce GHG emissions compared to fossil-fueled generation; however, dry-cooling may be required in many locations to minimize water consumption.

Heath, G. A.; Burkhardt, J. J.; Turchi, C. S.

2011-09-01T23:59:59.000Z

112

Generation of a Parabolic Trough Collector Efficiency Curve from Separate Measurements of Outdoor Optical Efficiency and Indoor Receiver Heat Loss  

SciTech Connect

The thermal efficiency of a parabolic trough collector is a function of both the fraction of direct normal radiation absorbed by the receiver (the optical efficiency) and the heat lost to the environment when the receiver is at operating temperature. The thermal efficiency can be determined by testing the collector under actual operating conditions or by separately measuring these two components. This paper describes how outdoor measurement of the optical efficiency is combined with laboratory measurements of receiver heat loss to obtain the thermal efficiency curve. This paper describes this approach and also makes the case that there are advantages to plotting collector efficiency versus the difference between the operating temperature and the ambient temperature at which the receiver heat loss was measured divided by radiation to a fractional power (on the order of 1/3 but obtained via data regression) - as opposed to the difference between operating and ambient temperatures divided by the radiation. The results are shown to be robust over wide ranges of ambient temperature, sky temperature, and wind speed.

Kutscher, C.; Burkholder, F.; Stynes, J. K.

2012-02-01T23:59:59.000Z

113

Reducing the Cost of Thermal Energy Storage for Parabolic Trough Solar Power Plants  

SciTech Connect

Thermal energy storage systems using phase change materials were evaluated for trough systems that use oil, steam, and high temperature salts as heat transfer fluids. A variety of eutectic salts and metal alloys were considered as phase change materials in a cascaded arrangement. Literature values of specific heat, latent heat, density, and other thermophysical properties were used in initial analyses. Testing laboratories were contracted to measure properties for candidate materials for comparison to the literature and for updating the models. A TRNSYS model from Phase 1 was further developed for optimizing the system, including a novel control algorithm. A concept for increasing the bulk thermal conductivity of the phase change system was developed using expanded metal sheets. Outside companies were contracted to design and cost systems using platecoil heat exchangers immersed in the phase change material. Laboratory evaluations of the one-dimensional and three-dimensional behavior of expanded metal sheets in a low conductivity medium were used to optimize the amount of thermal conductivity enhancement. The thermal energy storage systems were compared to baseline conventional systems. The best phase change system found in this project, which was for the high temperature plant, had a projected cost of $25.2 per kWhth, The best system also had a cost that was similar to the base case, a direct two-tank molten salt system.

Gawlik, Keith

2013-06-25T23:59:59.000Z

114

Numerical study on coupled fluid flow and heat transfer process in parabolic trough solar collector tube  

SciTech Connect

A unified two-dimensional numerical model was developed for the coupled heat transfer process in parabolic solar collector tube, which includes nature convection, forced convection, heat conduction and fluid-solid conjugate problem. The effects of Rayleigh number (Ra), tube diameter ratio and thermal conductivity of the tube wall on the heat transfer and fluid flow performance were numerically analyzed. The distributions of flow field, temperature field, local Nu and local temperature gradient were examined. The results show that when Ra is larger than 10{sup 5}, the effects of nature convection must be taken into account. With the increase of tube diameter ratio, the Nusselt number in inner tube (Nu{sub 1}) increases and the Nusselt number in annuli space (Nu{sub 2}) decreases. With the increase of tube wall thermal conductivity, Nu{sub 1} decreases and Nu{sub 2} increases. When thermal conductivity is larger than 200 W/(m K), it would have little effects on Nu and average temperatures. Due to the effect of the nature convection, along the circumferential direction (from top to down), the temperature in the cross-section decreases and the temperature gradient on inner tube surface increases at first. Then, the temperature and temperature gradients would present a converse variation at {theta} near {pi}. The local Nu on inner tube outer surface increases along circumferential direction until it reaches a maximum value then it decreases again. (author)

Tao, Y.B.; He, Y.L. [State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049 (China)

2010-10-15T23:59:59.000Z

115

Solar multiple optimization for a solar-only thermal power plant, using oil as heat transfer fluid in the parabolic trough collectors  

SciTech Connect

Usual size of parabolic trough solar thermal plants being built at present is approximately 50 MW{sub e}. Most of these plants do not have a thermal storage system for maintaining the power block performance at nominal conditions during long non-insolation periods. Because of that, a proper solar field size, with respect to the electric nominal power, is a fundamental choice. A too large field will be partially useless under high solar irradiance values whereas a small field will mainly make the power block to work at part-load conditions. This paper presents an economic optimization of the solar multiple for a solar-only parabolic trough plant, using neither hybridization nor thermal storage. Five parabolic trough plants have been considered, with the same parameters in the power block but different solar field sizes. Thermal performance for each solar power plant has been featured, both at nominal and part-load conditions. This characterization has been applied to perform a simulation in order to calculate the annual electricity produced by each of these plants. Once annual electric energy generation is known, levelized cost of energy (LCOE) for each plant is calculated, yielding a minimum LCOE value for a certain solar multiple value within the range considered. (author)

Montes, M.J. [E.T.S.I.Industriales - U.N.E.D., C/Juan del Rosal, 12, 28040 Madrid (Spain); Abanades, A.; Martinez-Val, J.M.; Valdes, M. [E.T.S.I.Industriales - U.P.M., C/Jose Gutierrez Abascal, 2, 28006 Madrid (Spain)

2009-12-15T23:59:59.000Z

116

Generation of a Parabolic Trough Collector Efficiency Curve from Separate Measurements of Outdoor Optical Efficiency and Indoor Receiver Heat Loss: Preprint  

DOE Green Energy (OSTI)

The overall efficiency of a parabolic trough collector is a function of both the fraction of direct normal radiation absorbed by the receiver (the optical efficiency) and the heat lost to the environment when the receiver is at operating temperature. The overall efficiency can be determined by testing the collector under actual operating conditions or by separately measuring these two components. This paper describes how outdoor measurement of the optical efficiency is combined with laboratory measurements of receiver heat loss to obtain an overall efficiency curve. Further, it presents a new way to plot efficiency that is more robust over a range of receiver operating temperatures.

Kutscher, C.; Burkholder, F.; Stynes, K.

2010-10-01T23:59:59.000Z

117

Nexant Parabolic Trough Solar Power Plant Systems Analysis; Task 1: Preferred Plant Size, 20 January 2005 - 31 December 2005  

DOE Green Energy (OSTI)

The Rankine cycles for commercial parabolic trough solar projects range in capacity from 13.5 MWe at the Solar Electric Generating Station I (SEGS I) plant, to a maximum of 89 MWe at the SEGS VIII/IX plants. The series of SEGS projects showed a consistent reduction in the levelized energy cost due to a combination of improvements in collector field technology and economies of scale in both the Rankine cycle and the operation and maintenance costs. Nonetheless, the question of the optimum Rankine cycle capacity remains an open issue. The capacities of the SEGS VIII/IX plants were limited by Federal Energy Regulatory Commission and Public Utility Regulatory Policy Act requirements to a maximum net output of 80 MWe. Further improvements in the Rankine cycle efficiency, and economies of scale in both the capital and the operating cost, should be available at larger plant sizes. An analysis was conducted to determine the effect of Rankine cycle capacities greater than 80 MWe on the levelized energy cost. The study was conducted through the following steps: (1) Three gross cycle capacities of 88 MWe, 165 MWe, and 220 MWe were selected. (2) Three Rankine cycle models were developed using the GateCycle program. The models were based on single reheat turbine cycles, with main steam conditions of 1,450 lb{sub f}/in{sup 2} and 703 F, and reheat steam conditions of 239 lb{sub f}/in{sup 2} and 703 F. The feedwater heater system consisted of 5 closed heaters and 1 open deaerating heater. The design condenser pressure was 2.5 in. HgA. (3) The optimization function within Excelergy was used to determine the preferred solar multiple for each plant. Two cases were considered for each plant: (a) a solar-only project without thermal storage, and (b) a solar-fossil hybrid project, with 3 hours of thermal storage and a heat transport fluid heater fired by natural gas. (4) For each of the 6 cases, collector field geometries, heat transport fluid pressure losses, and heat transport pump power requirements were calculated with a field piping optimization model. (5) Annual electric energy outputs, capital costs, and annual operating costs were calculated for each case using the default methods within Excelergy, from which estimates of the levelized energy costs were developed. The plant with the lowest energy cost was considered the optimum.

Kelly, B.

2006-07-01T23:59:59.000Z

118

New baseload power plants  

Science Conference Proceedings (OSTI)

This is a listing of 221 baseload power plant units currently in the planning stage. The list shows the plant owner, capacity, fuel, engineering firm, constructor, major equipment suppliers (steam generator, turbogenerator, and flue gas desulfurization system), partner, and date the plant is to be online. This data is a result of a survey by the journal of power plant owners.

Not Available

1994-04-01T23:59:59.000Z

119

New baseload power plants  

Science Conference Proceedings (OSTI)

This is a tabulation of the results of this magazines survey of current plans for new baseload power plants. The table lists the unit name, capacity, fuel, engineering firm, constructor, suppliers for steam generator, turbine generator and flue gas desulfurization equipment, date due on-line, and any non-utility participants. The table includes fossil-fuel plants, nuclear plants, geothermal, biomass and hydroelectric plants.

Not Available

1993-04-01T23:59:59.000Z

120

LCA (Life Cycle Assessment) of Parabolic Trough CSP: Materials Inventory and Embodied GHG Emissions from Two-Tank Indirect and Thermocline Thermal Storage (Presentation)  

DOE Green Energy (OSTI)

In the United States, concentrating solar power (CSP) is one of the most promising renewable energy (RE) technologies for reduction of electric sector greenhouse gas (GHG) emissions and for rapid capacity expansion. It is also one of the most price-competitive RE technologies, thanks in large measure to decades of field experience and consistent improvements in design. One of the key design features that makes CSP more attractive than many other RE technologies, like solar photovoltaics and wind, is the potential for including relatively low-cost and efficient thermal energy storage (TES), which can smooth the daily fluctuation of electricity production and extend its duration into the evening peak hours or longer. Because operational environmental burdens are typically small for RE technologies, life cycle assessment (LCA) is recognized as the most appropriate analytical approach for determining their environmental impacts of these technologies, including CSP. An LCA accounts for impacts from all stages in the development, operation, and decommissioning of a CSP plant, including such upstream stages as the extraction of raw materials used in system components, manufacturing of those components, and construction of the plant. The National Renewable Energy Laboratory (NREL) is undertaking an LCA of modern CSP plants, starting with those of parabolic trough design.

Heath, G.; Burkhardt, J.; Turchi, C.; Decker, T.; Kutscher, C.

2009-07-20T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Testing thermocline filler materials and molten-salt heat transfer fluids for thermal energy storage systems used in parabolic trough solar power plants.  

DOE Green Energy (OSTI)

Parabolic trough power systems that utilize concentrated solar energy to generate electricity are a proven technology. Industry and laboratory research efforts are now focusing on integration of thermal energy storage as a viable means to enhance dispatchability of concentrated solar energy. One option to significantly reduce costs is to use thermocline storage systems, low-cost filler materials as the primary thermal storage medium, and molten nitrate salts as the direct heat transfer fluid. Prior thermocline evaluations and thermal cycling tests at the Sandia National Laboratories' National Solar Thermal Test Facility identified quartzite rock and silica sand as potential filler materials. An expanded series of isothermal and thermal cycling experiments were planned and implemented to extend those studies in order to demonstrate the durability of these filler materials in molten nitrate salts over a range of operating temperatures for extended timeframes. Upon test completion, careful analyses of filler material samples, as well as the molten salt, were conducted to assess long-term durability and degradation mechanisms in these test conditions. Analysis results demonstrate that the quartzite rock and silica sand appear able to withstand the molten salt environment quite well. No significant deterioration that would impact the performance or operability of a thermocline thermal energy storage system was evident. Therefore, additional studies of the thermocline concept can continue armed with confidence that appropriate filler materials have been identified for the intended application.

Kelly, Michael James; Hlava, Paul Frank; Brosseau, Douglas A.

2004-07-01T23:59:59.000Z

122

NREL: TroughNet - Industry Partners  

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

the solar energy industry that partner with the U.S. Department of Energy's SunLab on parabolic trough technology research, development, and deployment efforts. Industry Partner...

123

Elastic approximation for a solar parabolic February 29, 2012  

E-Print Network (OSTI)

Elastic approximation for a solar parabolic trough February 29, 2012 Gang Xiao (University of Nice, France) Abstract For the production of the reective surface of a solar parabolic trough concentrator energy solutions. Introduction A parabolic trough [8] is a concentrating solar thermal energy collector

Paris-Sud XI, Université de

124

SunShot Initiative: Advanced Low-Cost Receivers for Parabolic...  

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

Advanced Low-Cost Receivers for Parabolic Troughs to someone by E-mail Share SunShot Initiative: Advanced Low-Cost Receivers for Parabolic Troughs on Facebook Tweet about SunShot...

125

Utilities expand baseload power plant plans  

Science Conference Proceedings (OSTI)

This article examines the plans being made by electric utilities to expand the number of baseload plants to accommodate increasing power demands. The results of a survey of utility's construction plans is presented. The topics include current construction, construction planning in the Southeast, current baseload technology, nuclear potential, and incorporation of environmental externalities impact in planning.

Smock, R.

1993-04-01T23:59:59.000Z

126

SunShot Initiative: CSP Heat Integration for Baseload Renewable...  

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

CSP Heat Integration for Baseload Renewable Energy Deployment to someone by E-mail Share SunShot Initiative: CSP Heat Integration for Baseload Renewable Energy Deployment on...

127

SunShot Initiative: Innovative Thermal Energy Storage for Baseload...  

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

Innovative Thermal Energy Storage for Baseload Solar Power Generation to someone by E-mail Share SunShot Initiative: Innovative Thermal Energy Storage for Baseload Solar Power...

128

SunShot Initiative: Brayton Cycle Baseload Power Tower  

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

Brayton Cycle Baseload Power Brayton Cycle Baseload Power Tower to someone by E-mail Share SunShot Initiative: Brayton Cycle Baseload Power Tower on Facebook Tweet about SunShot Initiative: Brayton Cycle Baseload Power Tower on Twitter Bookmark SunShot Initiative: Brayton Cycle Baseload Power Tower on Google Bookmark SunShot Initiative: Brayton Cycle Baseload Power Tower on Delicious Rank SunShot Initiative: Brayton Cycle Baseload Power Tower on Digg Find More places to share SunShot Initiative: Brayton Cycle Baseload Power Tower on AddThis.com... Concentrating Solar Power Systems Components Competitive Awards CSP Research & Development Thermal Storage CSP Recovery Act Baseload CSP SunShot Multidisciplinary University Research Initiative CSP Heat Integration for Baseload Renewable Energy Deployment

129

Solar trough systems  

DOE Green Energy (OSTI)

Trough systems predominate among today`s commercial solar power plants. All together, nine trough power plants, also called Solar Energy Generating Systems (SEGS), were built in the 1980s in the Mojave Desert near Barstow, California. These plants have a combined capacity of 354 megawatts (MW) and today generate enough electricity to meet the needs of approximately 500,000 people. Trough systems convert the heat from the sun into electricity. Because of their parabolical shape, troughs can focus the sun at 30--60 times its normal intensity on a receiver pipe located along the focal line of the trough. Synthetic oil captures this heat as the oil circulates through the pipe, reaching temperatures as high as 390 C (735 F). The hot oil is pumped to a generating station and routed through a heat exchanger to produce steam. Finally, electricity is produced in a conventional steam turbine. In addition to operating on solar energy the SEGS plants are configured as hybrids to operate on natural gas on cloudy days or after dark. Natural gas provides 25% of the output of the SEGS plants.

NONE

1998-04-01T23:59:59.000Z

130

NREL: TroughNet - Parabolic Trough Solar Field Technology  

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

of these collectors-made from galvanized steel-makes them suitable for commercial power plant applications. And they have proven to be highly reliable. For example, most of the...

131

NREL: TroughNet - Parabolic Trough Technology Research and Development  

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

single-tank thermocline storage system, concrete thermal energy storage, or phase-change thermal energy storage. Power Plant Technologies R&D activities have focused on the best...

132

SunShot Initiative: Baseload Concentrating Solar Power Generation  

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

Concentrating Solar Concentrating Solar Power Generation to someone by E-mail Share SunShot Initiative: Baseload Concentrating Solar Power Generation on Facebook Tweet about SunShot Initiative: Baseload Concentrating Solar Power Generation on Twitter Bookmark SunShot Initiative: Baseload Concentrating Solar Power Generation on Google Bookmark SunShot Initiative: Baseload Concentrating Solar Power Generation on Delicious Rank SunShot Initiative: Baseload Concentrating Solar Power Generation on Digg Find More places to share SunShot Initiative: Baseload Concentrating Solar Power Generation on AddThis.com... Concentrating Solar Power Systems Components Competitive Awards CSP Research & Development Thermal Storage CSP Recovery Act Baseload CSP SunShot Multidisciplinary University Research Initiative

133

Flexible Coal: Evolution from Baseload to Peaking Plant (Brochure...  

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

the transformation of power systems Flexible Coal Evolution from Baseload to Peaking Plant The experience cited in this paper is from a generating station with multiple units...

134

LPG-recovery processes for baseload LNG plants examined  

SciTech Connect

With demand on the rise, LPG produced from a baseload LNG plant becomes more attractive as a revenue-earning product similar to LNG. Efficient use of gas expanders in baseload LNG plants for LPG production therefore becomes more important. Several process variations for LPG recovery in baseload LNG plants are reviewed here. Exergy analysis (based on the Second Law of Thermodynamics) is applied to three cases to compare energy efficiency resulting from integration with the main liquefaction process. The paper discusses extraction in a baseload plant, extraction requirements, process recovery parameters, extraction process variations, and exergy analysis.

Chiu, C.H. [Bechtel Corp., Houston, TX (United States)

1997-11-24T23:59:59.000Z

135

OUT Success Stories: Solar Trough Power Plants  

DOE Green Energy (OSTI)

The Solar Electric Generating System (SEGS) plants use parabolic-trough solar collectors to capture the sun's energy and convert it to heat. The SEGS plants range in capacity from 13.8 to 80 MW, and they were constructed to meet Southern California Edison Company's periods of peak power demand.

Jones, J.

2000-08-05T23:59:59.000Z

136

Investment Decisions for Baseload Power Plants  

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

Investment Decisions for Investment Decisions for Baseload Power Plants January 29, 2010 402/012910 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, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United

137

NREL: TroughNet - Data and Resources  

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

Data and Resources Data and Resources This site features data and resources about parabolic trough power plant technology, including: Industry partners U.S. power plant data Solar data Models and tools System and component testing Also see our publications on parabolic trough power plants. Printable Version TroughNet Home Technologies Market & Economic Assessment Research & Development Data & Resources Industry Partners Power Plant Data Solar Data Models & Tools System & Component Testing FAQs Workshops Publications Email Updates Did you find what you needed? Yes 1 No 0 Thank you for your feedback. Would you like to take a moment to tell us how we can improve this page? Submit We value your feedback. Thanks! We've received your feedback. Something went wrong. Please try again later.

138

PARABOLIC DELIGNE-LUSZTIG VARIETIES. FRANCOIS DIGNE AND JEAN MICHEL  

E-Print Network (OSTI)

PARABOLIC DELIGNE-LUSZTIG VARIETIES. FRANC¸OIS DIGNE AND JEAN MICHEL Abstract. Motivated by the Brou´e conjecture on blocks with abelian defect groups for finite reductive groups, we study "parabolic of a braid monoid, whose action on their -adic cohomology will conjecturally factor trough a cyclotomic Hecke

139

Lite Trough LLC | Open Energy Information  

Open Energy Info (EERE)

Lite Trough LLC Lite Trough LLC Jump to: navigation, search Name Lite Trough LLC Place Milford, Connecticut Zip 6460 Sector Solar Product Developing a parabolic trough system for Solar Thermal Electricity Generation (STEG). Coordinates 38.026545°, -77.371139° 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":38.026545,"lon":-77.371139,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

140

SunShot Initiative: Baseload Concentrating Solar Power Generation  

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

Concentrating Solar Power Generation Concentrating Solar Power Generation In 2010, DOE issued the Baseload Concentrating Solar Power (CSP) Generation funding opportunity announcement (FOA). The following projects were selected under this competitive solicitation: Abengoa: Advanced Nitrate Salt Central Receiver Power Plant eSolar: Modular and Scalable Baseload Molten Salt Plant Conceptual Design and Feasibility General Atomics: Baseload CSP Generation Integrated with Sulfur-Based Thermochemical Heat Storage HiTek: Low-Cost Heliostat Development Infinia: Innovative Phase Change Thermal Energy Storage Solution for Baseload Power PPG: Next-Generation Low-Cost Reflector Rocketdyne: Solar Power Tower Improvements with the Potential to Reduce Costs SENER: High-Efficiency Thermal Storage System for Solar Plants

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Technical Manual for the SAM Physical Trough Model  

SciTech Connect

NREL, in conjunction with Sandia National Lab and the U.S Department of Energy, developed the System Advisor Model (SAM) analysis tool for renewable energy system performance and economic analysis. This paper documents the technical background and engineering formulation for one of SAM's two parabolic trough system models in SAM. The Physical Trough model calculates performance relationships based on physical first principles where possible, allowing the modeler to predict electricity production for a wider range of component geometries than is possible in the Empirical Trough model. This document describes the major parabolic trough plant subsystems in detail including the solar field, power block, thermal storage, piping, auxiliary heating, and control systems. This model makes use of both existing subsystem performance modeling approaches, and new approaches developed specifically for SAM.

Wagner, M. J.; Gilman, P.

2011-06-01T23:59:59.000Z

142

Parabolic Scaling and Curvelets Beyond Parabolic Scaling  

E-Print Network (OSTI)

Parabolic Scaling and Curvelets Beyond Parabolic Scaling Cubic Scaling for Caustics and Tangential on Imaging Science Hart F. Smith Cubic Scaling for Caustics and Tangential Reflections #12;Parabolic Scaling and Curvelets Beyond Parabolic Scaling The Second Dyadic Decomposition Wave-Evolution of Curvelets Second Dyadic

Smith, Hart F.

143

Overview on Use of a Molten Salt HTF in a Trough Solar Field (Presentation)  

DOE Green Energy (OSTI)

This presentation discusses the utilization of molten salt as the heat transfer fluid in a parabolic trough solar field to improve system performance and to reduce the levelized electricity.

Kearney, D.; Kelly, B.; Cable, R.; Potrovitza, N.; Herrmann, U.; Nava, P.; Mahoney, R.; Pacheco, J.; Blake, D.; Price, H.

2003-02-01T23:59:59.000Z

144

Parabolic Deligne-Lusztig varieties  

E-Print Network (OSTI)

Motivated by the Brou\\'e conjecture on blocks with abelian defect groups for finite reductive groups, we study "parabolic" Deligne-Lusztig varieties and construct on those which occur in the Brou\\'e conjecture an action of a braid monoid, whose action on their $\\ell$-adic cohomology will conjecturally factor trough a cyclotomic Hecke algebra. In order to construct this action, we need to enlarge the set of varieties we consider to varieties attached to a "ribbon category"; this category is a {\\em Garside category}, which plays an important role in our proof, so we devote the first part of our paper to the necessary background on Garside categories.

Digne, François

2011-01-01T23:59:59.000Z

145

Emissions and Energy Efficiency Assessment of Baseload Wind  

E-Print Network (OSTI)

. Many technologies exist that are capable of storing electrical energy, including pumped hydro storage). A wind energy system using a pure storage system such as pumped hydro would require a greater peak powerEmissions and Energy Efficiency Assessment of Baseload Wind Energy Systems P A U L D E N H O L M

Sheridan, Jennifer

146

Parabolic geometries BGG sequences  

E-Print Network (OSTI)

Parabolic geometries BGG sequences Prolongation procedures BGG Sequences and Geometric sequences and overdetermined systems #12;Parabolic geometries BGG sequences Prolongation procedures Parabolic geometries are a large class of differential geometric structures, which can be described

Drmota, Michael

147

Parabolic Quantum Cloak.  

E-Print Network (OSTI)

??It is shown that the parabolic quantum cloak can be theoretically design by using âtransformation design methodâ. We discuss the possibility to build a parabolic… (more)

Chang, Yu-Hsuan

2013-01-01T23:59:59.000Z

148

Custom Engineering parabolic glass reflector for the Sandia prototype solar collector  

DOE Green Energy (OSTI)

The parabolic glass reflector, designed and constructed by Custom Engineering, Incorporated, is described. A brief summary of its performance as part of the Sandia prototype trough solar collector system is given.

Otts, J.; Sallis, D.

1981-08-01T23:59:59.000Z

149

The parabolic Harnack inequality  

E-Print Network (OSTI)

The parabolic Harnack inequality on metric graphs Sebastian Haeseler 1. Basic definitions 2. Volume-doubling properties 3. Poincar´e inequalities 4. The parabolic Harnack inequality 5. Examples The parabolic Harnack parabolic Harnack inequality on metric graphs Sebastian Haeseler 1. Basic definitions 2. Volume

Novak, Erich

150

SunShot Initiative: Modular and Scalable Baseload Molten Salt Plant  

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

Modular and Scalable Baseload Modular and Scalable Baseload Molten Salt Plant Conceptual Design and Feasibility to someone by E-mail Share SunShot Initiative: Modular and Scalable Baseload Molten Salt Plant Conceptual Design and Feasibility on Facebook Tweet about SunShot Initiative: Modular and Scalable Baseload Molten Salt Plant Conceptual Design and Feasibility on Twitter Bookmark SunShot Initiative: Modular and Scalable Baseload Molten Salt Plant Conceptual Design and Feasibility on Google Bookmark SunShot Initiative: Modular and Scalable Baseload Molten Salt Plant Conceptual Design and Feasibility on Delicious Rank SunShot Initiative: Modular and Scalable Baseload Molten Salt Plant Conceptual Design and Feasibility on Digg Find More places to share SunShot Initiative: Modular and Scalable

151

NREL: TroughNet - Email Updates - Subscribe  

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

Email Updates - Subscribe Email Updates - Subscribe Subscribe to receive email updates about parabolic trough technology, including: Status on R&D and deployment projects Workshops and other events New publications New data and resources. Please provide and submit the following information. Name (first & last): Organization/Affiliation: Email Address: Submit Clear Form Unsubscribe Printable Version TroughNet Home Technologies Market & Economic Assessment Research & Development Data & Resources FAQs Workshops Publications Email Updates Did you find what you needed? Yes 1 No 0 Thank you for your feedback. Would you like to take a moment to tell us how we can improve this page? Submit We value your feedback. Thanks! We've received your feedback. Something went wrong. Please try again later.

152

Rinse trough with improved flow  

SciTech Connect

Novel rinse troughs accomplish thorough uniform rinsing. The troughs are suitable for one or more essentially planar objects having substantially the same shape. The troughs ensure that each surface is rinsed uniformly. The new troughs provide uniform rinse fluid flow over the objects' surfaces to accomplish a more thorough rinse than prior art troughs.

O' Hern, Timothy J. (Albuquerque, NM); Grasser, Thomas W. (Albuquerque, NM)

1998-01-01T23:59:59.000Z

153

Parabolic Raynaud bundles  

E-Print Network (OSTI)

Let X be an irreducible smooth projective curve defined over complex numbers, S= {p_1, p_2,...,p_n} \\subset X$ a finite set of closed points and N > 1 a fixed integer. For any pair (r,d) in Z X Z/N, there exists a parabolic vector bundle R_{r,d,*} on X, with parabolic structure over S and all parabolic weights in Z/N, that has the following property: Take any parabolic vector bundle E_* of rank r on X whose parabolic points are contained in S, all the parabolic weights are in Z/N and the parabolic degree is d. Then E_* is parabolic semistable if and only if there is no nonzero parabolic homomorphism from R_{r,d,*} to E_*.

Biswas, Indranil

2007-01-01T23:59:59.000Z

154

Parabolic-like maps  

E-Print Network (OSTI)

In this paper we introduce the notion of parabolic-like mapping, which is an object similar to a polynomial-like mapping, but with a parabolic external class, i.e. an external map with a parabolic fixed point. We prove a straightening theorem for parabolic-like maps, which states that any parabolic-like map of degree 2 is hybrid conjugate to a member of the family Per_1(1), and this member is unique (up to holomorphic conjugacy) if the filled Julia set of the parabolic-like map is connected.

Lomonaco, Luciana Luna Anna

2011-01-01T23:59:59.000Z

155

SunShot Initiative: Baseload CSP Generation Integrated with Sulfur-Based  

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

CSP Generation CSP Generation Integrated with Sulfur-Based Thermochemical Heat Storage to someone by E-mail Share SunShot Initiative: Baseload CSP Generation Integrated with Sulfur-Based Thermochemical Heat Storage on Facebook Tweet about SunShot Initiative: Baseload CSP Generation Integrated with Sulfur-Based Thermochemical Heat Storage on Twitter Bookmark SunShot Initiative: Baseload CSP Generation Integrated with Sulfur-Based Thermochemical Heat Storage on Google Bookmark SunShot Initiative: Baseload CSP Generation Integrated with Sulfur-Based Thermochemical Heat Storage on Delicious Rank SunShot Initiative: Baseload CSP Generation Integrated with Sulfur-Based Thermochemical Heat Storage on Digg Find More places to share SunShot Initiative: Baseload CSP Generation Integrated with Sulfur-Based Thermochemical Heat Storage on

156

Presenting parabolic subgroups  

E-Print Network (OSTI)

Consider a relatively hyperbolic group G. We prove that if G is finitely presented, so are its parabolic subgroups. Moreover, a presentation of the parabolic subgroups can be found algorithmically from a presentation of G, a solution of its word problem, and generating sets of the parabolic subgroups. We also give an algorithm that finds parabolic subgroups in a given recursively enumerable class of groups.

Dahmani, François

2010-01-01T23:59:59.000Z

157

Advanced Low-Cost Receivers for Parabolic Troughs (Fact Sheet)  

Science Conference Proceedings (OSTI)

Norwich Technologies is one of the 2012 SunShot CSP R&D awardees for their advanced receivers. This fact sheet explains the motivation, description, and impact of the project.

Not Available

2012-09-01T23:59:59.000Z

158

Parabolic Trough Power for the California Competitive Market (Presentation)  

DOE Green Energy (OSTI)

This presentation includes discusses the restructuring of the California power market and the resulting impacts.

Price, H.; Cable, B.

2001-04-01T23:59:59.000Z

159

A New Optical Evaluation Approach for Parabolic Trough ...  

solar power (CSP) technologies used in commercial utility-scale power generation plants [1]. As a means to collect solar energy, the optical ...

160

Cooling for Parabolic Trough Power Plants: Overview (Presentation)  

DOE Green Energy (OSTI)

This presentation discusses water requirements for power generation and includes an analysis of wet/dry cooling.

Not Available

2006-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Directed flow fluid rinse trough  

SciTech Connect

Novel rinse troughs accomplish thorough uniform rinsing. The tanks are suitable for one or more essentially planar items having substantially the same shape. The troughs ensure that each surface is rinsed uniformly. The new troughs also require less rinse fluid to accomplish a thorough rinse than prior art troughs.

Kempka, Steven N. (9504 Lona La., Albuquerque, NM 87111); Walters, Robert N. (11872 LaGrange St., Boise, ID 83709)

1996-01-01T23:59:59.000Z

162

Modular Trough Power Plant Cycle and Systems Analysis  

DOE Green Energy (OSTI)

This report summarizes an analysis to reduce the cost of power production from modular concentrating solar power plants through a relatively new and exciting concept that merges two mature technologies to produce distributed modular electric power in the range of 500 to 1,500 kWe. These are the organic Rankine cycle (ORC) power plant and the concentrating solar parabolic (CSP) trough technologies that have been developed independent of each other over many years.

Price, H.; Hassani, V.

2002-01-01T23:59:59.000Z

163

PARABOLIC GEODESICS AS PARALLEL CURVES IN PARABOLIC GEOMETRIES  

E-Print Network (OSTI)

PARABOLIC GEODESICS AS PARALLEL CURVES IN PARABOLIC GEOMETRIES MARC HERZLICH Abstract. We give a simple characterization of the parabolic geodesics introduced by Cap, Slovák and Zádník for all parabolic then show that parabolic geodesics can be characterized as the following data: a curve on the manifold

Paris-Sud XI, Université de

164

A new trough solar concentrator and its performance analysis  

SciTech Connect

The operation principle and design method of a new trough solar concentrator is presented in this paper. Some important design parameters about the concentrator are analyzed and optimized. Their magnitude ranges are given. Some characteristic parameters about the concentrator are compared with that of the conventional parabolic trough solar concentrator. The factors having influence on the performance of the unit are discussed. It is indicated through the analysis that the new trough solar concentrator can actualize reflection focusing for the sun light using multiple curved surface compound method. It also has the advantages of improving the work performance and environment of high-temperature solar absorber and enhancing the configuration intensity of the reflection surface. (author)

Tao, Tao; Hongfei, Zheng [School of Mechanical and Vehicular, Beijing Institute of Technology, Beijing 100081 (China); Kaiyan, He [School of Physical Science and Technology, Guangxi University, Nanning 530004 (China); Mayere, Abdulkarim [Institute of Sustainable Energy Technology, University of Nottingham, Nottingham NG7 2RD (United Kingdom)

2011-01-15T23:59:59.000Z

165

Parabolic flows on complex manifolds  

E-Print Network (OSTI)

Chapter 2 Convergence of the parabolic complex Monge-Amp`ere65] Streets, J. , Tian, G. A parabolic flow of pluriclosedGill, M. Convergence of the parabolic complex Monge-Amp` ere

Gill, Matthew Franklin

2012-01-01T23:59:59.000Z

166

Optimal control, parabolic equations, st  

E-Print Network (OSTI)

state constraints, for parabolic systems have been studied in Casas [20], ... troduced for deriving optimality conditionsfor parabolic problems with pure or mixed.

167

Parabolic flows on complex manifolds.  

E-Print Network (OSTI)

??We prove C ? convergence for suitably normalized solutions of the parabolic complex Monge-Ampère equation on compact Hermitian manifolds. This provides a parabolic proof of… (more)

Gill, Matthew Franklin

2012-01-01T23:59:59.000Z

168

Flexible Coal: Evolution from Baseload to Peaking Plant (Brochure)  

Science Conference Proceedings (OSTI)

Twenty-first century power systems, with higher penetration levels of low-carbon energy, smart grids, and other emerging technologies, will favor resources that have low marginal costs and provide system flexibility (e.g., the ability to cycle on and off to follow changes in variable renewable energy plant output). Questions remain about both the fate of coal plants in this scenario and whether they can cost-effectively continue to operate if they cycle routinely. The experience from the CGS plant demonstrates that coal plants can become flexible resources. This flexibility - namely the ability to cycle on and off and run at lower output (below 40% of capacity) - requires limited hardware modifications but extensive modifications to operational practice. Cycling does damage the plant and impact its life expectancy compared to baseload operations. Nevertheless, strategic modifications, proactive inspections and training programs, among other operational changes to accommodate cycling, can minimize the extent of damage and optimize the cost of maintenance. CGS's cycling, but not necessarily the associated price tag, is replicable. Context - namely, power market opportunities and composition of the generation fleet - will help determine for other coal plants the optimal balance between the level of cycling-related forced outages and the level of capital investment required to minimize those outages. Replicating CGS's experience elsewhere will likely require a higher acceptance of forced outages than regulators and plant operators are accustomed to; however, an increase in strategic maintenance can minimize the impact on outage rates.

Cochran, J.; Lew, D.; Kumar, N.

2013-12-01T23:59:59.000Z

169

Parabolic Trouogh Optical Characterization at the National Renewable Energy Laboratory  

DOE Green Energy (OSTI)

Solar parabolic trough power plant projects are soon to be implemented in the United States and internationally. In addition to these new projects, parabolic trough power plants totaling approximately 350 MW already exist within the United States and have operated for close to 20 years. As such, the status of the technology exists within several different phases. Theses phases include R&D, manufacturing and installation, and operations and maintenance. One aspect of successful deployment of this technology is achieving and maintaining optical performance. Different optical tools are needed to assist in improving initial designs, provide quality control during manufacture and assembly, and help maintain performance during operation. This paper discusses several such tools developed at SunLab (a joint project of the National Renewable Laboratory and Sandia National Laboratories) for these purposes. Preliminary testing results are presented. Finally, plans for further tool development are discussed.

Wendelin, T. J.

2005-01-01T23:59:59.000Z

170

Supplying Baseload Power and Reducing Transmission Requirements by Interconnecting Wind Farms  

Science Conference Proceedings (OSTI)

Wind is the world’s fastest growing electric energy source. Because it is intermittent, though, wind is not used to supply baseload electric power today. Interconnecting wind farms through the transmission grid is a simple and effective way of ...

Cristina L. Archer; Mark Z. Jacobson

2007-11-01T23:59:59.000Z

171

On parabolic Whittaker functions  

E-Print Network (OSTI)

We derive a Mellin-Barnes integral representation for solution to generalized (parabolic) quantum Toda lattice introduced in \\cite{GLO}, which presumably describes the $(S^1\\times U_N)$-equivariant Gromov-Witten invariants of Grassmann variety.

Sergey Oblezin

2010-11-18T23:59:59.000Z

172

On parabolic Whittaker functions  

E-Print Network (OSTI)

We derive a Mellin-Barnes integral representation for solution to generalized (parabolic) quantum Toda lattice introduced in \\cite{GLO}, which presumably describes the $(S^1\\times U_N)$-equivariant Gromov-Witten invariants of Grassmann variety.

Oblezin, Sergey

2010-01-01T23:59:59.000Z

173

Detailed Physical Trough Model for NREL's Solar Advisor Model: Preprint  

SciTech Connect

Solar Advisor Model (SAM) is a free software package made available by the National Renewable Energy Laboratory (NREL), Sandia National Laboratory, and the US Department of Energy. SAM contains hourly system performance and economic models for concentrating solar power (CSP) systems, photovoltaic, solar hot-water, and generic fuel-use technologies. Versions of SAM prior to 2010 included only the parabolic trough model based on Excelergy. This model uses top-level empirical performance curves to characterize plant behavior, and thus is limited in predictive capability for new technologies or component configurations. To address this and other functionality challenges, a new trough model; derived from physical first principles was commissioned to supplement the Excelergy-based empirical model. This new 'physical model' approaches the task of characterizing the performance of the whole parabolic trough plant by replacing empirical curve-fit relationships with more detailed calculations where practical. The resulting model matches the annual performance of the SAM empirical model (which has been previously verified with plant data) while maintaining run-times compatible with parametric analysis, adding additional flexibility in modeled system configurations, and providing more detailed performance calculations in the solar field, power block, piping, and storage subsystems.

Wagner, M. J.; Blair, N.; Dobos, A.

2010-10-01T23:59:59.000Z

174

Properties of parabolic Sobolev and parabolic Besov spaces  

E-Print Network (OSTI)

In this paper, we characterize parabolic Besov and parabolic Sobolev spaces in ${\\bf R}^{n+1}$ and ${\\bf R}^{n+1}_T, \\,\\, T > 0$. We also, study the relation between parabolic Besov spaces in ${\\bf R}^{n}_T, \\,\\, T > 0$ and standard Besov space in $\\R$.

Chang, Tongkeun

2011-01-01T23:59:59.000Z

175

Page not found | Department of Energy  

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

em-ssab-charter Download CX-008586: Categorical Exclusion Determination SkyFuel Baseload Parabolic Trough CX(s) Applied: B3.6, B5.15 Date: 07112012 Location(s): Colorado...

176

Page not found | Department of Energy  

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

Download CX-008586: Categorical Exclusion Determination SkyFuel Baseload Parabolic Trough CX(s) Applied: B3.6, B5.15 Date: 07112012 Location(s): Colorado Offices(s):...

177

PARABOLIC EXHAUSTIONS AND ANALYTIC COVERINGS  

E-Print Network (OSTI)

PARABOLIC EXHAUSTIONS AND ANALYTIC COVERINGS Finnur L´arusson January 31, 1993 Abstract. Let be a parabolic exhaustion on a Stein manifold X such that is strictly plurisubharmonic at its zeros. The metric to be parabolic because its logarithm is plurisubharmonic and satisfies the so-called Monge-Amp`ere equation

Lárusson, Finnur

178

Parabolically connected subgroups  

SciTech Connect

All reductive spherical subgroups of the group SL(n) are found for which the intersections with every parabolic subgroup of SL(n) are connected. This condition guarantees that open equivariant embeddings of the corresponding homogeneous spaces into Moishezon spaces are algebraic. Bibliography: 6 titles.

Netai, Igor V [M. V. Lomonosov Moscow State University, Faculty of Mechanics and Mathematics, Moscow (Russian Federation)

2011-08-31T23:59:59.000Z

179

A compound parabolic concentrator  

SciTech Connect

A compound parabolic concentrator (CPC) for solar energy applications is presented in this work. A prototype was built and its thermal performance was determined. Operating temperatures of the order of 150 /sup 0/C with a reasonable efficiency can be attained by means of a fixed CPC.

Manrique, J.A.

1984-05-01T23:59:59.000Z

180

Parabolic submanifolds of rank two  

E-Print Network (OSTI)

The goal of this paper is to classify parametrically parabolic submanifolds in any codimension. First, we describe the ones that are ruled and show that they are the only parabolic submanifolds that admit an isometric immersion as a hypersurface. Then, we classify the nonruled ones by two different means. In fact, we provide the polar and bipolar parametrizations, each of which is associated to a parabolic surface and a function on the surface which satisfies a parabolic differential equation. To conclude, we describe the structure of the singular set of the nonruled parabolic submanifolds.

Dajczer, Marcos

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Parabolic k-ample bundles  

E-Print Network (OSTI)

We construct projectivization of a parabolic vector bundle and a tautological line bundle over it. It is shown that a parabolic vector bundle is ample if and only if the tautological line bundle is ample. This allows us to generalize the notion of a k-ample bundle, introduced by Sommese, to the context of parabolic bundles. A parabolic vector bundle $E_*$ is defined to be k-ample if the tautological line bundle ${\\mathcal O}_{{\\mathbb P}(E_*)}(1)$ is $k$--ample. We establish some properties of parabolic k-ample bundles.

Biswas, Indranil

2011-01-01T23:59:59.000Z

182

Parabolic-Dish Solar Concentrators of Film on Foam  

E-Print Network (OSTI)

Parabolic and spherical mirrors are constructed of aluminized PET polyester film on urethane foam. During construction, the chosen shape of the mirror is created by manipulating the elastic/plastic behavior of the film with air pressure. Foam is then applied to the film and, once hardened, air pressure is removed. At an f-number of 0.68, preliminary models have an optical angular spread of less than 0.25 degrees, a factor of 3.3 smaller than that for a perfectly spherical mirror. The possibility exists for creating large-lightweight mirrors with excellent shape and stiffness. These "film-on-foam" construction techniques may also be applicable to parabolic-trough solar concentrators but do not appear to be suitable for optical imaging applications because of irregularities in the film.

Barton, Sean A

2009-01-01T23:59:59.000Z

183

Sensitivity of Concentrating Solar Power Trough Performance, Cost and Financing with Solar Advisor Model  

Science Conference Proceedings (OSTI)

A comprehensive solar technology systems analysis model, the Solar Advisor Model (SAM) was developed to support the federal R&D community and the solar industry. This model, developed by staff at NREL and Sandia National Laboratory, is able to model the costs, finances, and performance of concentrating solar power and photovoltaics (PV). Currently, parabolic troughs and concentrating PV are the two concentrating technologies modeled within the SAM environment.

Blair, N.; Mehos, M.; Christensen, C.

2008-03-01T23:59:59.000Z

184

Parabolic John-Nirenberg spaces  

E-Print Network (OSTI)

We introduce a parabolic version of John-Nirenberg space with exponent $p$ and show that it is contained in local weak-$L^p$ spaces.

Berkovits, Lauri

2011-01-01T23:59:59.000Z

185

CALCULATING THE PARABOLIC CHERN CHARACTER OF A LOCALLY ABELIAN PARABOLIC BUNDLE  

E-Print Network (OSTI)

CALCULATING THE PARABOLIC CHERN CHARACTER OF A LOCALLY ABELIAN PARABOLIC BUNDLE CHADI HASSAN TAHER Abstract. We calculate the parabolic Chern character of a bundle with locally abelian parabolic structure for the parabolic Chern character of a locally abelian parabolic bundle on (X, D) in terms of: --the Chern character

Paris-Sud XI, Université de

186

Orthogonal parabolic reflector systems  

SciTech Connect

A structure is described comprising: a reflecting surface which has an axis and is open at least at one axial end and in an axial section generally conforms to an axial section through a surface generated by rotating a portion of a parabolic curve about an axis perpendicular to the axis of the parabola defined by the curve; and an elongated source/sink which extends at least in the direction of the axis of the reflecting surface and is at least partly enveloped by the reflecting surface.

Cheng, D.Y.

1993-08-10T23:59:59.000Z

187

SunShot Initiative: Baseload CSP Generation Integrated with Sulfur-Based  

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

CSP Generation Integrated with Sulfur-Based Thermochemical Heat Storage CSP Generation Integrated with Sulfur-Based Thermochemical Heat Storage General Atomics logo Graphic of a diagram of squares and circles connected by arrows. Sulfur-based TES can compensate for diurnal and seasonal insolation fluctuations. General Atomics, under the Baseload CSP FOA, is demonstrating the engineering feasibility of using a sulfur-based thermochemical cycle to store heat from a CSP plant and support baseload power generation. Approach There are three main project objectives under this award: Study the sulfur generating disproportionation reaction and develop it into a practical engineering process step. Carry out preliminary process components design and experimental validation. The engineering data will be used for process integration between the CSP plant, the sulfur processing and storage plant, and the electricity generation unit.

188

Freeze-thaw tests of trough receivers employing a molten salt working fluid.  

SciTech Connect

Several studies predict an economic benefit of using nitrate-based salts instead of the current synthetic oil within a solar parabolic trough field. However, the expected economic benefit can only be realized if the reliability and optical performance of the salt trough system is comparable to today's oil trough. Of primary concern is whether a salt-freeze accident and subsequent thaw will lead to damage of the heat collection elements (HCEs). This topic was investigated by experiments and analytical analysis. Results to date suggest that damage will not occur if the HCEs are not completely filled with salt. However, if the HCE is completely filled at the time of the freeze, the subsequent thaw can lead to plastic deformation and significant bending of the absorber tube.

Moss, Timothy A.; Iverson, Brian D.; Siegel, Nathan Phillip; Kolb, Gregory J.; Ho, Clifford Kuofei

2010-05-01T23:59:59.000Z

189

Monsoon Trough Boundary Layer Experiment (MONTBLEX)  

Science Conference Proceedings (OSTI)

The Monsoon Trough Boundary Layer Experiment (MONTBLEX) is a multi-institutional, all-India coordinated program to study the atmospheric boundary-layer processes in the monsoon trough (MT) area of northern India. The experiment is being organized ...

Malti Goel; H. N. Srivastava

1990-11-01T23:59:59.000Z

190

Mobile trough genesis over the Mongolian Plateau  

E-Print Network (OSTI)

The purpose of this study is to understand the mechanisms responsible for formation of mobile troughs over the large source region in Mongolia. Three winter season mobile troughs which intensified rapidly after formation were analyzed. An objective method developed by Lefevre and Nielsen-Gammon (1995) was used to track the mobile troughs-a quasigeostrophic potential vorticity (QGPV) and associated piecewise tendency diagnosis (PTD) technique developed by Lefevre (1995) was used to analyze the formation mechanisms. Through the PTD technique, which involves in the inversion of QGPV and QGPV advection, it was determined that the mobile troughs developed from a combination of deformation / superposition and downstream development. Baroclinic processes were not evident near the time of formation, but were important as the troughs moved over the Sea of Japan. Two troughs interacted with surface cyclones, but in both cases only minor development occurred. As the troughs moved underneath a climatological mean long wave trough, all three troughs weakened from deformation. There was evidence of orographic masking in one of the cases as the mobile trough existed at upper-levels (above 500 mb) prior to formation by the objective method. However, as the trough moved to the lee-side of the Altai-Sayan mountains, the trough lowered to 500 mb and was initialized by the objective method.

McEver, Gregory David

1996-01-01T23:59:59.000Z

191

A Relation Between the Parabolic . . .  

E-Print Network (OSTI)

In this paper, we consider the weight i de Rham–Gauss–Manin bundles on a smooth variety arising from a smooth projective morphism f: XU ? ? U for i ? 0. We associate to each weight i de Rham bundle, a certain parabolic bundle on S and consider their parabolic Chern characters in the rational Chow groups, for a good compactification S of U. We show the triviality of the alternating sum of these parabolic bundles in the (positive degree) rational Chow groups. This removes the hypothesis of semistable reduction in the original result of this kind due to Esnault and Viehweg.

Jaya NN Iyer; Carlos T. Simpson

2006-01-01T23:59:59.000Z

192

Parabolic subgroups of Garside groups  

E-Print Network (OSTI)

A Garside monoid is a cancellative monoid with a finite lattice generating set; a Garside group is the group of fractions of a Garside monoid. The family of Garside groups contains the Artin-Tits groups of spherical type. We generalise the well-known notion of a parabolic subgroup of an Artin-Tits group into that of a parabolic subgroup of a Garside group. We also define the more general notion of a Garside subgroup of a Garside group, which is related to the notion of LCMhomomorphisms between Artin-Tits groups. We prove that most of the properties of parabolic subgroups extend to this subgroups.

Eddy Godelle

2008-01-01T23:59:59.000Z

193

KSTABILITY AND PARABOLIC STABILITY YANN ROLLIN  

E-Print Network (OSTI)

K­STABILITY AND PARABOLIC STABILITY YANN ROLLIN Abstract. Parabolic structures with rational that the three notions of parabolic polystability, K­polystability and existence of constant sca­ lar curvature K, we study iterated blowups of ruled surfaces encoded by a parabolic structure. Our main result, stated

Paris-Sud XI, Université de

194

STUDIA MATHEMATICA 193 (3) (2009) On the parabolic-elliptic limit of the doubly parabolic  

E-Print Network (OSTI)

STUDIA MATHEMATICA 193 (3) (2009) On the parabolic-elliptic limit of the doubly parabolic Keller, of solu- tions of the parabolic-parabolic Keller­Segel system in the plane to the corresponding solutions of the parabolic-elliptic model, as a physical parameter goes to zero. Our main tools are suitable space

Pujo-Menjouet, Laurent

195

On the parabolic-elliptic limit of the doubly parabolic KellerSegel system  

E-Print Network (OSTI)

On the parabolic-elliptic limit of the doubly parabolic Keller­Segel system modelling chemotaxis convergence results, in strong topologies, for so- lutions of the parabolic-parabolic Keller­Segel system in the plane, to the corresponding solutions of the parabolic-elliptic model, as a phys- ical parameter goes

Paris-Sud XI, Université de

196

MODULI SPACES OF PARABOLIC HIGGS BUNDLES AND PARABOLIC K(D) PAIRS OVER SMOOTH CURVES: I  

E-Print Network (OSTI)

MODULI SPACES OF PARABOLIC HIGGS BUNDLES AND PARABOLIC K(D) PAIRS OVER SMOOTH CURVES: I HANS U. BODEN AND K â?? OJI YOKOGAWA Abstract. This paper concerns the moduli spaces of rank two parabolic Higgs bundles and parabolic K(D) pairs over a smooth curve. Precisely which parabolic bundles occur in stable K

Boden, Hans U.

197

THE CHERN CHARACTER OF A PARABOLIC BUNDLE, AND A PARABOLIC COROLLARY OF REZNIKOV'S THEOREM  

E-Print Network (OSTI)

THE CHERN CHARACTER OF A PARABOLIC BUNDLE, AND A PARABOLIC COROLLARY OF REZNIKOV'S THEOREM JAYA NN character of a locally abelian parabolic bundle in terms of its constituent bundles. Several features and variants of parabolic structures are discussed. Parabolic bundles arising from logarithmic connections form

Iyer, Jaya N,

198

Large heavy-duty gas turbines for base-load power generation and heat cogeneration  

SciTech Connect

The predominant role of large gas turbines has shifted from peaking-load duty to midrange and base-load electric power generation, especially within combined-cycle plants. Such applications require heavy-duty industrial gas turbines to ensure the same high reliability and availability for continuous service as the associated steam turbines. It is also important that the gas turbines be designed for low maintenance to minimize the necessary outage times and costs for component repair and replacement. The basic design principles and applications of Model V94 gas turbines are discussed with special reference to highly reliable and economic bulk power generation.

Joyce, J.S.

1985-01-01T23:59:59.000Z

199

Courant Algebroids in Parabolic Geometry  

E-Print Network (OSTI)

Let $p$ be a Lie subalgebra of a semisimple Lie algebra $g$ and $(G,P)$ be the corresponding pair of connected Lie groups. A Cartan geometry of type $(G,P)$ associates to a smooth manifold $M$ a principal $P$-bundle and a Cartan connection, and a parabolic geometry is a Cartan geometry where $P$ is parabolic. We show that if $P$ is parabolic, the adjoint tractor bundle of a Cartan geometry, which is isomorphic to the Atiyah algebroid of the principal $P$-bundle, admits the structure of a (pre-)Courant algebroid, and we identify the topological obstruction to the bracket being a Courant bracket. For semisimple $G$, the Atiyah algebroid of the principal $P$-bundle associated to the Cartan geometry of $(G,P)$ admits a pre-Courant algebroid structure if and only if $P$ is parabolic.

Stuart Armstrong; Rongmin Lu

2011-12-29T23:59:59.000Z

200

Progress in parabolic dish technology  

DOE Green Energy (OSTI)

This report describes the current status of parabolic dish technology. Its purpose is to communicate the principal outcomes of DOE's parabolic dish technology RandD efforts carried out at the Solar Energy Research Institute; Sandia National Laboratory, Albuquerque; the Jet Propulsion Laboratory; and other DOE national laboratories. It is written for those in industry, academia, and government who have a special interest in solar thermal systems that use parabolic dishes as collectors. The evolution of parabolic technology is described, and examples of projects in operation and under construction are included. Solar thermal dish technology can supply either electric or thermal energy to various applications over a broad range of system sizes and temperatures. These solar energy systems will be available by the time this country needs additional electric generation capacity -- in the mid to late 1990s -- at costs competitive with other energy sources. 9 refs., 54 figs., 6 tabs.

Stine, W.B.

1989-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

The Parabolic-Trigonometric Functions  

E-Print Network (OSTI)

The parabolic functions are introduced in analogy to the circular and hyperbolic cases. We discuss the relevant properties, the geometrical interpretation and touch on possible generalizations and their link with the modular elliptic functions.

G. Dattoli; M. Migliorati; M. Quattromini; P. E. Ricci

2011-02-08T23:59:59.000Z

202

Optimization of disk generator performance for base-load power plant systems applications  

SciTech Connect

Disk generators for use in base-load MHD power plants are examined for both open-cycle and closed-cycle operating modes. The OCD cases are compared with PSPEC results for a linear channel; enthalpy extractions up to 23% with 71% isentropic efficiency are achievable with generator inlet conditions similar to those used in PSPEC, thus confirming that the disk configuration is a viable alternative for base-load power generation. The evaluation of closed-cycle disks includes use of a simplified cycle model. High system efficiencies over a wide range of power levels are obtained for effective Hall coefficients in the range 2.3 to 4.9. Cases with higher turbulence (implying ..beta../sub eff/ less than or equal to 2.4) yield high system efficiencies at power levels of 100 to 500 MW/sub e/. All these CCD cases compare favorably with linear channels reported in the GE ECAS study, yielding higher isentropic efficiences for a given enthalpy extraction. Power densities in the range 70 to 170 MW/m/sup 3/ appear feasible, leading to very compact generator configurations.

Teare, J.D.; Loubsky, W.J.; Lytle, J.K.; Louis, J.F.

1980-01-01T23:59:59.000Z

203

Advanced photovoltaic-trough development  

DOE Green Energy (OSTI)

The scope of the work on photvoltaic troughs includes analytical studies, hardware development, and component testing. Various aspects of the system have been optimized and improvements have been realized, particularly in the receiver and reflecting surface designs. An empirical system performance model has been developed that closely agrees with measured system performance. This in-depth study of single-axis reflecting linear focus photovoltaic concentrators will be very beneficial in the development of improved models for similar systems as well as other phtovoltaic concentrator designs.

Spencer, R.; Yasuda, K.; Merson, B.

1982-04-01T23:59:59.000Z

204

Fabrication of trough-shaped solar collectors  

SciTech Connect

There is provided a radiant energy concentration and collection device formed of a one-piece thin-walled plastic substrate including a plurality of nonimaging troughs with certain metallized surfaces of the substrate serving as reflective side walls for each trough. The one-piece plastic substrate is provided with a seating surface at the bottom of each trough which conforms to the shape of an energy receiver to be seated therein.

Schertz, William W. (Batavia, IL)

1978-01-01T23:59:59.000Z

205

Shenandoah parabolic dish solar collector  

DOE Green Energy (OSTI)

The objectives of the Shenandoah, Georgia, Solar Total Energy System are to design, construct, test, and operate a solar energy system to obtain experience with large-scale hardware systems for future applications. This report describes the initial design and testing activities conducted to select and develop a collector that would serve the need of such a solar total energy system. The parabolic dish was selected as the collector most likely to maximize energy collection as required by this specific site. The fabrication, testing, and installation of the parabolic dish collector incorporating improvements identified during the development testing phase are described.

Kinoshita, G.S.

1985-01-01T23:59:59.000Z

206

Development and Demonstration of an Innovative Thermal Energy Storage System for Baseload Power Generation  

Science Conference Proceedings (OSTI)

The objective of this project is to research and develop a thermal energy storage system (operating range 3000C ���¢�������� 450 0C ) based on encapsulated phase change materials (PCM) that can meet the utility-scale base-load concentrated solar power plant requirements at much lower system costs compared to the existing thermal energy storage (TES) concepts. The major focus of this program is to develop suitable encapsulation methods for existing low-cost phase change materials that would provide a cost effective and reliable solution for thermal energy storage to be integrated in solar thermal power plants. This project proposes a TES system concept that will allow for an increase of the capacity factor of the present CSP technologies to 75% or greater and reduce the cost to less than $20/kWht.

D. Y. Goswami

2012-09-04T23:59:59.000Z

207

THE STRUCTURE OF TWO-PARABOLIC SPACE: PARABOLIC DUST AND ITERATION.  

E-Print Network (OSTI)

THE STRUCTURE OF TWO-PARABOLIC SPACE: PARABOLIC DUST AND ITERATION. JANE GILMAN Abstract. A non-elementary M¨obius group generated by two- parabolics is determined up to conjugation by one complex para] to obtain an additional struc- ture for the parameter space, which we term the two-parabolic space

Gilman, Jane

208

PARABOLIC SCHEMES FOR QUASI-LINEAR PARABOLIC AND HYPERBOLIC PDES VIA STOCHASTIC CALCULUS  

E-Print Network (OSTI)

PARABOLIC SCHEMES FOR QUASI-LINEAR PARABOLIC AND HYPERBOLIC PDES VIA STOCHASTIC CALCULUS SEBASTIEN of a unique global strong solution for the parabolic system. We show the existence of a unique local strong not use weak solution theory but recursive parabolic schemes studied via a stochastic approach

Paris-Sud XI, Université de

209

AN ABSTRACT APPROACH TO DOMAIN PERTURBATION FOR PARABOLIC EQUATIONS AND PARABOLIC  

E-Print Network (OSTI)

AN ABSTRACT APPROACH TO DOMAIN PERTURBATION FOR PARABOLIC EQUATIONS AND PARABOLIC VARIATIONAL Australia Abstract. We study the behaviour of solutions of linear non-autonomous parabolic equations subject of func- tion spaces for non-autonomous parabolic problems is equivalent to Mosco convergence of function

Sydney, University of

210

Threshold results for semilinear parabolic systems  

E-Print Network (OSTI)

A threshold result was proved in this paper for semilinear parabolic system with pure power type nonlinearities

Xie, Qiuyi Dai Haiyang He Junhui

2010-01-01T23:59:59.000Z

211

REGULARITY FOR A DOUBLY NONLINEAR PARABOLIC EQUATION  

E-Print Network (OSTI)

REGULARITY FOR A DOUBLY NONLINEAR PARABOLIC EQUATION JUHA KINNUNEN Abstract. This survey focuses on regularity results for certain degenerate doubly nonlinear parabolic equations in the case when the Lebesgue This note focuses on the regularity of nonnegative weak solutions to the doubly nonlinear parabolic equation

Kinnunen, Juha

212

Coupled Parabolic Equations for Wave Propagation  

E-Print Network (OSTI)

Coupled Parabolic Equations for Wave Propagation Kai Huang, Knut Solna and Hongkai Zhao #3; April 30, 2004 Abstract We develop an algorithm using two coupled parabolic equations for numerical simulation of wave propagation over long distances. The coupled parabolic equations are derived from a two

Zhao, Hongkai

213

The parabolic Mandelbrot set Pascale ROESCH  

E-Print Network (OSTI)

The parabolic Mandelbrot set Pascale ROESCH (joint work with C. L. PETERSEN, IMFUFA Roskilde) Institute of Mathematics of Toulouse 21 february 2011 Roesch P. (IMT) The parabolic Mandelbrot set 21 february 2011 1 / 94 #12;Consider a rational map of degree d 2 Roesch P. (IMT) The parabolic Mandelbrot

Roesch, Pascale

214

Parabolic Molecules Philipp Grohs and Gitta Kutyniok  

E-Print Network (OSTI)

Parabolic Molecules Philipp Grohs and Gitta Kutyniok June 9, 2012 Abstract Anisotropic decompositions using representation systems based on parabolic scaling such as curve- lets or shearlets have of the notion of parabolic molecules, we aim to provide a comprehensive framework which includes customarily

Kutyniok, Gitta

215

The near parabolic renormalization Inou and Shishikura  

E-Print Network (OSTI)

The near parabolic renormalization of Inou and Shishikura Arnaud Ch´eritat Institut de Math´ematiques de Toulouse Oberwolfach, April 2008 A. Ch´eritat (IMT) Near parabolic renormalization Oberwolfach, April 2008 1 / 19 #12;1 Renormalization in complex dynamics 2 The parabolic renormalization 3 Near

Chéritat, Arnaud

216

Degenerate Parabolic Stochastic Partial Differential Equations  

E-Print Network (OSTI)

Degenerate Parabolic Stochastic Partial Differential Equations Martina Hofmanov´a Abstract. We study the Cauchy problem for a scalar semilinear degenerate parabolic partial differential equation the notion of kinetic solution which is well suited for degenerate parabolic problems and supplies a good

Paris-Sud XI, Université de

217

Release Version Parabolic Dish Microphone System  

E-Print Network (OSTI)

Release Version Parabolic Dish Microphone System Prepared by: Zhixin Chen (Ph.D. Student), with the assistance of Robert C. Maher (Associate Professor) Montana State University A parabolic dish microphone is like a mirror telescope for sound. A parabolic reflector is used to collect and focus sound waves

Maher, Robert C.

218

Plane and parabolic solar panels  

E-Print Network (OSTI)

We present a plane and parabolic collector that absorbs radiant energy and transforms it in heat. Therefore we have a panel to heat water. We study how to increment this capture of solar beams onto the panel in order to increase its efficiency in heating water.

Sales, J H O

2009-01-01T23:59:59.000Z

219

Plane and parabolic solar panels  

E-Print Network (OSTI)

We present a plane and parabolic collector that absorbs radiant energy and transforms it in heat. Therefore we have a panel to heat water. We study how to increment this capture of solar beams onto the panel in order to increase its efficiency in heating water.

J. H. O. Sales; A. T. Suzuki

2009-05-14T23:59:59.000Z

220

Parabolic tapers for overmoded waveguides  

DOE Patents (OSTI)

A waveguide taper with a parabolic profile, in which the distance along the taper axis varies as the square of the tapered dimension, provides less mode conversion than equal length linear tapers and is easier to fabricate than other non-linear tapers.

Doane, J.L.

1983-11-25T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Acceptance Performance Test Guideline for Utility Scale Parabolic Trough and Other CSP Solar Thermal Systems: Preprint  

DOE Green Energy (OSTI)

Prior to commercial operation, large solar systems in utility-size power plants need to pass a performance acceptance test conducted by the engineering, procurement, and construction (EPC) contractor or owners. In lieu of the present absence of ASME or other international test codes developed for this purpose, the National Renewable Energy Laboratory has undertaken the development of interim guidelines to provide recommendations for test procedures that can yield results of a high level of accuracy consistent with good engineering knowledge and practice. Progress on interim guidelines was presented at SolarPACES 2010. Significant additions and modifications were made to the guidelines since that time, resulting in a final report published by NREL in April 2011. This paper summarizes those changes, which emphasize criteria for assuring thermal equilibrium and steady state conditions within the solar field.

Mehos, M. S.; Wagner, M. J.; Kearney, D. W.

2011-08-01T23:59:59.000Z

222

Reducing the Cost of Thermal Energy Storage for Parabolic Trough Solar Power Plants  

DOE Green Energy (OSTI)

kWhth, The best system also had a cost that was similar to the base case, a direct two-tank molten salt system.

Gawlik, Keith

2013-06-25T23:59:59.000Z

223

Thermal Analysis, Design and Experimental Investigation of Parabolic Trough Solar Collector.  

E-Print Network (OSTI)

??Energy is one of the building blocks of modern society. The growth of the modern society has been fueled by cheap, abundant energy resources. Solar… (more)

Yidnekachew Messele, Yidnekachew

2012-01-01T23:59:59.000Z

224

Design and analysis of hydraulically driven actuation system For a parabolic solar trough.  

E-Print Network (OSTI)

??Cataloged from PDF version of thesis.Includes bibliographical references (page 34).This thesis documents Katarina Popovic's contribution to the design of hydraulic cylinder actuation system for day… (more)

Popovi?, Katarina, S.B. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

225

Mechanical development of an actuation system for a parabolic solar trough collector.  

E-Print Network (OSTI)

??Cataloged from PDF version of thesis.Includes bibliographical references (page 26).This thesis documents my personal contribution to the development of a hydraulic-based actuation system for a… (more)

Carrillo, Juan Felipe (Carrillo Salazar)

2013-01-01T23:59:59.000Z

226

Evaluation of the operational performance of a parabolic trough CSP plant.  

E-Print Network (OSTI)

?? Renewable energy technologies are in the spotlight. On the one hand, they are called to have a leading role in the battle against climate… (more)

Ruiz Sanches, Carlos; Guillermo

2013-01-01T23:59:59.000Z

227

Analysis of Parabolic Trough Solar Energy Integration into Different Geothermal Power Generation Concepts.  

E-Print Network (OSTI)

?? The change in climate as a consequence of anthropogenic activities is a subject ofmajor concerns. In order to reduce the amount of greenhouse gas… (more)

Vahland, Sören

2013-01-01T23:59:59.000Z

228

High thermal energy storage density molten salts for parabolic trough solar power generation.  

E-Print Network (OSTI)

??New alkali nitrate-nitrite systems were developed by using thermodynamic modeling and the eutectic points were predicted based on the change of Gibbs energy of fusion.… (more)

Wang, Tao

2011-01-01T23:59:59.000Z

229

Parabolic concentrating collector: a tutorial  

DOE Green Energy (OSTI)

A tutorial overview of point-focusing parabolic collectors is presented. Optical and thermal characteristics of such collectors are discussed. Data representing typical achievable collector efficiencies are presented and the importance of balancing collector cost with concentrator quality is argued through the development of a figure of merit for the collector. The impact of receiver temperature on performance is assessed and the general observation made that temperatures much in excess of 1500 to 2000/sup 0/F can actually result in decreased performance. Various types of two-axis tracking collectors are described, including the standard parabolic deep dish, Cassegrainian and Fresnel, as well as two forms of fixed mirrors with articulating receivers. The present DOE program to develop these devices is briefly discussed, as are present and projected costs for these collectors. Pricing information is presented for the only known commercial design available on the open market.

Truscello, V.C.

1979-02-15T23:59:59.000Z

230

Nuclear power: least cost option for base-load electricity in Finland  

E-Print Network (OSTI)

As a result of the outstanding operating experience and the low electricity production costs of the existing Finnish nuclear power plants, energy-intensive process industries in particular have a strong belief in nuclear power. There is a potential interest in building more nuclear capacity, the fifth unit, in order to guarantee for Finnish industry the availability of cheap electrical energy in the future. In any case more baseload generation capacity will be needed by 2010 to meet the future growth of electricity consumption in Finland. Nuclear power generation matches excellently with the long-duration load profile of the Finnish power system. The good performance of Finnish nuclear power has yielded benefits also to consumers through its contribution to decreasing the electricity price. Furthermore, the introduction of nuclear power has resulted in a clear drop in the carbon dioxide emissions from electricity generation during the 1970s and 1980s, as shown in Figure 1. In 1999 the four Finnish nuclear power units at Loviisa and Olkiluoto generated 22.1 TWh of electricity, roughly equivalent to one third of the total

Risto Tarjanne; Sauli Rissanen

2000-01-01T23:59:59.000Z

231

Trough Receiver Heat Loss Testing (Presentation)  

DOE Green Energy (OSTI)

This presentation describes the design, fabrication, and qualification of an experimental capability for thermal loss testing of full-size trough receiver elements; and the testing on a variety of receivers.

Lewandowski, A.; Feik, C.; Hansen, R.; Phillips, S.; Bingham, C.; Netter, J.; Forristal, R.; Burkholder, F.; Meglan, B.; Wolfrum, E.

2006-02-01T23:59:59.000Z

232

Advanced Gas Turbine Guidelines: Hot Gas Path Parts Condition and Remaining Life Assessment for GE 7FA in Baseload Operation  

Science Conference Proceedings (OSTI)

Based on two years experience operating four advanced gas turbines (AGT) General Electric MS 7221 FA at Martin CC of Florida Power & Light (FP&L), this guideline describes the operating and maintenance philosophy used for baseload AGT units and the integrity of the hot path components and their remaining life. The guideline will assist utilities operating the GE MS 7221FA class AGT plan inspections and comparisons with other units in this class.

1997-04-16T23:59:59.000Z

233

Base-Load and Peak Electricity from a Combined Nuclear Heat and Fossil Combined-Cycle Plant  

SciTech Connect

A combined-cycle power plant is proposed that uses heat from a high-temperature reactor and fossil fuel to meet base-load and peak electrical demands. The high temperature gas turbine produces shaft power to turn an electric generator. The hot exhaust is then fed to a heat recovery steam generator (HRSG) that provides steam to a steam turbine for added electrical power production. A simplified computational model of the thermal power conversion system was developed in order to parametrically investigate two different steady-state operation conditions: base load nuclear heat only from an Advanced High Temperature Reactor (AHTR), and combined nuclear heat with fossil heat to increase the turbine inlet temperature. These two cases bracket the expected range of power levels, where any intermediate power level can result during electrical load following. The computed results indicate that combined nuclear-fossil systems have the potential to offer both low-cost base-load electricity and lower-cost peak power relative to the existing combination of base-load nuclear plants and separate fossil-fired peak-electricity production units. In addition, electric grid stability, reduced greenhouse gases, and operational flexibility can also result with using the conventional technology presented here for the thermal power conversion system coupled with the AHTR. (authors)

Conklin, James C.; Forsberg, Charles W. [Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831 (United States)

2007-07-01T23:59:59.000Z

234

Base-Load and Peak Electricity from a Combined Nuclear Heat and Fossil Combined-Cycle Plant  

Science Conference Proceedings (OSTI)

A combined-cycle power plant is proposed that uses heat from a high-temperature reactor and fossil fuel to meet base-load and peak electrical demands. The high-temperature gas turbine produces shaft power to turn an electric generator. The hot exhaust is then fed to a heat recovery steam generator (HRSG) that provides steam to a steam turbine for added electrical power production. A simplified computational model of the thermal power conversion system was developed in order to parametrically investigate two different steady-state operation conditions: base load nuclear heat only from an Advanced High Temperature Reactor (AHTR), and combined nuclear heat with fossil heat to increase the turbine inlet temperature. These two cases bracket the expected range of power levels, where any intermediate power level can result during electrical load following. The computed results indicate that combined nuclear-fossil systems have the potential to offer both low-cost base-load electricity and lower-cost peak power relative to the existing combination of base-load nuclear plants and separate fossil-fired peak-electricity production units. In addition, electric grid stability, reduced greenhouse gases, and operational flexibility can also result with using the conventional technology presented here for the thermal power conversion system coupled with the AHTR.

Conklin, Jim [ORNL; Forsberg, Charles W [ORNL

2007-01-01T23:59:59.000Z

235

Parabolic systems and an underlying Lagrangian.  

E-Print Network (OSTI)

??In this thesis, we extend De Giorgi's interpolation method to a class of parabolic equations which are not gradient flows but possess an entropy functional… (more)

Yolcu, Türkay

2009-01-01T23:59:59.000Z

236

Parabolic Weingarten surfaces in hyperbolic space  

E-Print Network (OSTI)

A surface in hyperbolic space $\\h^3$ invariant by a group of parabolic isometries is called a parabolic surface. In this paper we investigate parabolic surfaces of $\\h^3$ that satisfy a linear Weingarten relation of the form $a\\kappa_1+b\\kappa_2=c$ or $aH+bK=c$, where $a,b,c\\in \\r$ and, as usual, $\\kappa_i$ are the principal curvatures, $H$ is the mean curvature and $K$ is de Gaussian curvature. We classify all parabolic linear Weingarten surfaces in hyperbolic space.

López, Rafael

2008-01-01T23:59:59.000Z

237

Parabolic equations without a minimum principle.  

E-Print Network (OSTI)

??In this thesis, we consider several parabolic equations for which the minimum principle fails. We first consider a two-point boundary value problem for a one… (more)

Pang, Huadong

2007-01-01T23:59:59.000Z

238

Bibliography Parabolic Geometries and Weyl connections Nearly invariant calculus (Wunsch's) nearly invariant calculus for parabolic  

E-Print Network (OSTI)

Bibliography Parabolic Geometries and Weyl connections Nearly invariant calculus (W¨unsch's) nearly invariant calculus for parabolic geometries Jan Slov´ak Masaryk University, Brno, Czech Republic joint work;Bibliography Parabolic Geometries and Weyl connections Nearly invariant calculus Structure 1 Bibliography 2

Olver, Peter

239

ON CARLEMAN ESTIMATES FOR ELLIPTIC AND PARABOLIC OPERATORS. APPLICATIONS TO UNIQUE CONTINUATION AND CONTROL OF PARABOLIC  

E-Print Network (OSTI)

ON CARLEMAN ESTIMATES FOR ELLIPTIC AND PARABOLIC OPERATORS. APPLICATIONS TO UNIQUE CONTINUATION AND CONTROL OF PARABOLIC EQUATIONS J´ER ^OME LE ROUSSEAU AND GILLES LEBEAU Abstract. Local and global Carleman and parabolic operators by means of semi-classical microlocal techniques. Optimality results for these estimates

Paris-Sud XI, Université de

240

THE PARABOLIC-PARABOLIC KELLER-SEGEL SYSTEM WITH CRITICAL DIFFUSION AS A GRADIENT FLOW IN Rd  

E-Print Network (OSTI)

THE PARABOLIC-PARABOLIC KELLER-SEGEL SYSTEM WITH CRITICAL DIFFUSION AS A GRADIENT FLOW IN Rd , d 3 ADRIEN BLANCHET1 AND PHILIPPE LAURENC¸OT2 Abstract. It is known that, for the parabolic-elliptic Keller for the parabolic-parabolic Keller-Segel system with critical porous-medium type diffusion in dimension Rd , d 3

Paris-Sud XI, Université de

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241

PARABOLIC COMPARISON PRINCIPLE AND QUASIMINIMIZERS IN METRIC MEASURE SPACES  

E-Print Network (OSTI)

PARABOLIC COMPARISON PRINCIPLE AND QUASIMINIMIZERS IN METRIC MEASURE SPACES JUHA KINNUNEN AND MATHIAS MASSON Abstract. We give several characterizations of parabolic (quasisuper)- minimizers prove a version of com- parison principle for super- and subminimizers on parabolic space-time cylinders

Kinnunen, Juha

242

A discrete BGK approximation for strongly degenerate parabolic problems  

E-Print Network (OSTI)

A discrete BGK approximation for strongly degenerate parabolic problems with boundary conditions F strongly degenerate hyperbolic--parabolic equations with initial boundary condition. We prove a priori -- strongly degenerate parabolic equations -- singular perturbation problems -- BGK models 1 Introduction

243

A Note on Parabolic Subgroups of a Coxeter Group  

E-Print Network (OSTI)

The aim of this note is to prove that the parabolic closure of any subset of a Coxeter group is a parabolic subgroup. To obtain that, several technical lemmas on the root system of a parabolic subgroup are established.

Dongwen Qi

2008-01-01T23:59:59.000Z

244

Life Cycle Greenhouse Gas Emissions of Trough and Tower Concentrating Solar Power Electricity Generation: Systematic Review and Harmonization  

SciTech Connect

In reviewing life cycle assessment (LCA) literature of utility-scale concentrating solar power (CSP) systems, this analysis focuses on reducing variability and clarifying the central tendency of published estimates of life cycle greenhouse gas (GHG) emissions through a meta-analytical process called harmonization. From 125 references reviewed, 10 produced 36 independent GHG emissions estimates passing screens for quality and relevance: 19 for parabolic trough (trough) technology and 17 for power tower (tower) technology. The interquartile range (IQR) of published estimates for troughs and towers were 83 and 20 grams of carbon dioxide equivalent per kilowatt-hour (g CO2-eq/kWh),1 respectively; median estimates were 26 and 38 g CO2-eq/kWh for trough and tower, respectively. Two levels of harmonization were applied. Light harmonization reduced variability in published estimates by using consistent values for key parameters pertaining to plant design and performance. The IQR and median were reduced by 87% and 17%, respectively, for troughs. For towers, the IQR and median decreased by 33% and 38%, respectively. Next, five trough LCAs reporting detailed life cycle inventories were identified. The variability and central tendency of their estimates are reduced by 91% and 81%, respectively, after light harmonization. By harmonizing these five estimates to consistent values for global warming intensities of materials and expanding system boundaries to consistently include electricity and auxiliary natural gas combustion, variability is reduced by an additional 32% while central tendency increases by 8%. These harmonized values provide useful starting points for policy makers in evaluating life cycle GHG emissions from CSP projects without the requirement to conduct a full LCA for each new project.

Burkhardt, J. J.; Heath, G.; Cohen, E.

2012-04-01T23:59:59.000Z

245

QED with a parabolic mirror  

E-Print Network (OSTI)

We investigate the quantum electrodynamics of a single two-level atom located at the focus of a parabolic cavity. We first work out the modifications of the spontaneous emission induced by the presence of this boundary in the optical regime, where the dipole and the rotating-wave approximations apply. Furthermore, the single-photon state that leaves the cavity asymptotically is determined. The corresponding time-reversed single-photon quantum state is capable of exciting the atom in this extreme multimode scenario with near-unit probability. Using semiclassical methods, we derive a photon-path representation for the relevant transition amplitudes and show that it constitutes a satisfactory approximation for a wide range of wavelengths.

G. Alber; J. Z. Bernád; M. Stobi?ska; L. L. Sánchez-Soto; G. Leuchs

2013-05-11T23:59:59.000Z

246

S-Parabolic manifolds A. Aytuna and A. Sadullaev  

E-Print Network (OSTI)

S-Parabolic manifolds A. Aytuna and A. Sadullaev Abstract. A Stein manifold is called S parabolic. If a continuous special plurisubharmonic exits then we will call the manifold S parabolic: In one dimensional case of dimension n is called S parabolic in case there exits a special plurisubharmonic function 2 PSH (X

Yanikoglu, Berrin

247

ERGODIC THEORY OF PARABOLIC HORSESHOES MARIUSZ URBANSKI AND CHRISTIAN WOLF  

E-Print Network (OSTI)

ERGODIC THEORY OF PARABOLIC HORSESHOES MARIUSZ URBA´NSKI AND CHRISTIAN WOLF Abstract. In this paper parabolic fixed point and possibly also on Ws (). We call f a parabolic horseshoe map. In order to analyze of an embedded parabolic iterated function system and to apply the developed theory of the symbolic -finite

Urbanski, Mariusz

248

ERGODIC THEORY OF PARABOLIC HORSESHOES MARIUSZ URBANSKI AND CHRISTIAN WOLF  

E-Print Network (OSTI)

ERGODIC THEORY OF PARABOLIC HORSESHOES MARIUSZ URBA´NSKI AND CHRISTIAN WOLF Abstract. In this paper parabolic fixed point and possibly also on Ws (). We call f a parabolic horseshoe map. In order to analyze the pressure function to the pressure of an embedded parabolic iterated function system and to apply

Wolf, Christian

249

PARABOLIC RAYNAUD BUNDLES INDRANIL BISWAS AND GEORG HEIN  

E-Print Network (OSTI)

PARABOLIC RAYNAUD BUNDLES INDRANIL BISWAS AND GEORG HEIN Abstract. Let X be an irreducible smooth and N 2 a fixed integer. For any pair (r, d) N Ã? 1 N Z, there exists a parabolic vector bundle Rr,d, on X, with parabolic structure over S and all parabolic weights in 1 N Z, that has the following

Hein, Georg

250

Large-angle Parabolic Equation Methods James T. Kirby*  

E-Print Network (OSTI)

CHAPTER 32 Large-angle Parabolic Equation Methods James T. Kirby* Large-angle parabolic equation of the parabolic equation method (PEM) to any relevant wave propagation problem implies that a principal is to examine two methods of extending the basic parabolic equation method to include large-angle effects

Kirby, James T.

251

On a parabolic logarithmic Sobolev inequality H. Ibrahim ,,, R. Monneau  

E-Print Network (OSTI)

On a parabolic logarithmic Sobolev inequality H. Ibrahim ,,, R. Monneau December 19, 2008 Abstract a parabolic version of the Kozono-Taniuchi inequality by means of anisotropic (parabolic) BMO norm. More precisely we give an upper bound for the L norm of a function in terms of its parabolic BMO norm, up

Monneau, Régis

252

2008 Solar Technologies Market Report  

E-Print Network (OSTI)

72 Figure 3.20. Generic parabolic trough CSP costwhich is dominated by parabolic trough technology, troughsMarket (GW) Share Parabolic trough Tower Dish-engine Total

Price, S.

2010-01-01T23:59:59.000Z

253

Solar Trough Power Plants: Office of Power Technologies (OPT) Success Stories Series Fact Sheet  

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

Concentrating Solar Power Program Concentrating Solar Power Program Office of Solar Energy Technologies operate for 80% of the summer mid-peak hours and 66% of the winter mid-peak hours. A natural gas backup system supplements the solar capacity and contributes 25% of the plants' annual output. The SEGS plants use parabolic-trough solar collectors to capture the sun's energy and convert it to heat. In the SEGS design, the curved solar collectors focus sunlight onto a receiver pipe. Mechanical controls slowly rotate the collectors during the day, keeping them aimed at the sun as it travels across the sky. Synthetic oil flowing through the receiver pipe serves as the heat transfer medium. The collectors concentrate sunlight 30 to 60 times the normal intensity on the receiver, heating the oil as high as 735°F (390°C).

254

Rational Approximation for a Quasilinear Parabolic Equation  

E-Print Network (OSTI)

Approximation theorems, analogous to known results for linear elliptic equations, are obtained for solutions of the heat equation. Via the Cole-Hopf transformation, this gives rise to approximation theorems for a nonlinear parabolic equation, Burgers' equation.

P. M. Gauthier; N. Tarkhanov

2007-09-22T23:59:59.000Z

255

Parabolic cylinder functions implemented in Matlab  

E-Print Network (OSTI)

Routines for computation of Weber's parabolic cylinder functions and their derivatives are implemented in Matlab for both moderate and great values of the argument. Standard, real solutions are considered. Tables of values are included.

E. Cojocaru

2009-01-15T23:59:59.000Z

256

Parabolic equations without a minimum principle  

E-Print Network (OSTI)

In this thesis, we consider several parabolic equations for which the minimum principle fails. We first consider a two-point boundary value problem for a one dimensional diffusion equation. We show the uniqueness and ...

Pang, Huadong

2007-01-01T23:59:59.000Z

257

Modeling Photovoltaic and Concentrating Solar Power Trough Performance, Cost, and Financing with Solar Advisor Model  

DOE Green Energy (OSTI)

A comprehensive solar technology systems analysis model, the Solar Advisor Model (SAM), has been developed to support the federal R&D community and the solar industry by staff at the National Renewable Energy Laboratory (NREL) and Sandia National Laboratory. This model is able to model the finances, incentives, and performance of flat-plate photovoltaic (PV), concentrating PV, and concentrating solar power (specifically, parabolic troughs). The primary function of the model is to allow users to investigate the impact of variations in performance, cost, and financial parameters to better understand their impact on key figures of merit. Figures of merit related to the cost and performance of these systems include, but aren't limited to, system output, system efficiencies, levelized cost of energy, return on investment, and system capital and O&M costs. SAM allows users to do complex system modeling with an intuitive graphical user interface (GUI). In fact, all tables and graphics for this paper are taken directly from the model GUI. This model has the capability to compare different solar technologies within the same interface, making use of similar cost and finance assumptions. Additionally, the ability to do parametric and sensitivity analysis is central to this model. There are several models within SAM to model the performance of photovoltaic modules and inverters. This paper presents an overview of each PV and inverter model, introduces a new generic model, and briefly discusses the concentrating solar power (CSP) parabolic trough model. A comparison of results using the different PV and inverter models is also presented.

Blair, N.; Mehos, M.; Christensen, C.; Cameron, C.

2008-01-01T23:59:59.000Z

258

Prediction and optimization of the performance of parabolic solar dish concentrator with sphere receiver using analytical function  

E-Print Network (OSTI)

Parabolic solar dish concentrator with sphere receiver is less studied. We present an analytic function to calculate the intercept factor of the system with real sun bright distribution and Gaussian distribution, the results indicate that the intercept factor is related to the rim angle of reflector and the ratio of open angle of receiver at the top of reflector to optical error when the optical error is larger than or equal to 5 mrad, but is related to the rim angle, open angle and optical error in less than 5 mrad optical error. Furthermore we propose a quick process to optimize the system to provide the maximum solar energy to net heat efficiency for different optical error under typical condition. The results indicate that the parabolic solar dish concentrator with sphere receiver has rather high solar energy to net heat efficiency which is 20% more than solar trough and tower system including higher cosine factor and lower heat loss of the receiver.

Huang, Weidong; Hu, Peng; Chen, Zeshao

2011-01-01T23:59:59.000Z

259

Modeling Photovoltaic and Concentrating Solar Power Trough Performance, Cost, and Financing with the Solar Advisor Model: Preprint  

Science Conference Proceedings (OSTI)

A comprehensive solar technology systems analysis model, the Solar Advisor Model (SAM), has been developed to support the federal R&D community and the solar industry by staff at the National Renewable Energy Laboratory (NREL) and Sandia National Laboratory. This model is able to model the finances, incentives, and performance of flat-plate photovoltaic (PV), concentrating PV, and concentrating solar power (specifically, parabolic troughs). The primary function of the model is to allow users to investigate the impact of variations in performance, cost, and financial parameters to better understand their impact on key figures of merit. Figures of merit related to the cost and performance of these systems include, but aren't limited to, system output, system efficiencies, levelized cost of energy, return on investment, and system capital and O&M costs. There are several models within SAM to model the performance of photovoltaic modules and inverters. This paper presents an overview of each PV and inverter model, introduces a new generic model, and briefly discusses the concentrating solar power (CSP) parabolic trough model. A comparison of results using the different PV and inverter models is also presented.

Blair, N.; Mehos, M.; Christensen, C.; Cameron, C.

2008-05-01T23:59:59.000Z

260

Geophysical Study of the Salton Trough of Southern California...  

Open Energy Info (EERE)

1964 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for Geophysical Study of the Salton Trough of Southern California Citation Shawn...

Note: This page contains sample records for the topic "baseload parabolic trough" 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.
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to obtain the most current and comprehensive results.


261

Geothermal Literature Review At Salton Trough Geothermal Area (1984) | Open  

Open Energy Info (EERE)

Trough Geothermal Area (1984) Trough Geothermal Area (1984) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At Salton Trough Geothermal Area (1984) Exploration Activity Details Location Salton Trough Geothermal Area Exploration Technique Geothermal Literature Review Activity Date 1984 Usefulness not indicated DOE-funding Unknown Notes The melt zones of volcanic clusters was analyzed with recent geological and geophysical data for five magma-hydrothermal systems were studied for the purpose of developing estimates for the depth, volume and location of magma beneath each area. References Goldstein, N. E.; Flexser, S. (1 December 1984) Melt zones beneath five volcanic complexes in California: an assessment of shallow magma occurrences

262

Design considerations for parabolic-cylindrical solar collectors  

DOE Green Energy (OSTI)

This report presents in some detail the various significant factors which influence the design of parabolic-cylindrical solar collectors.

Treadwell, G.W.

1976-07-01T23:59:59.000Z

263

PARABOLIC SUBGROUPS OF GARSIDE GROUPS II : EDDY GODELLE  

E-Print Network (OSTI)

PARABOLIC SUBGROUPS OF GARSIDE GROUPS II : RIBBONS EDDY GODELLE Abstract. We introduce parabolic subgroupoids and provide a groupoid presentation. In order to established the latter result, we subgroups, namely the standard parabolic subgroups, which are the subgroups generated by a subset

Paris-Sud XI, Université de

264

PARABOLIC DELIGNE-LUSZTIG VARIETIES. FRANCOIS DIGNE AND JEAN MICHEL  

E-Print Network (OSTI)

PARABOLIC DELIGNE-LUSZTIG VARIETIES. FRANC¸OIS DIGNE AND JEAN MICHEL Abstract. Motivated by the Brou´e conjecture on blocks with abelian defect groups for finite reductive groups, we study "parabolic categories. 1. Introduction In this paper, we study "parabolic" Deligne-Lusztig varieties, one of the main

Paris-Sud XI, Université de

265

INITIAL BOUNDARY VALUE PROBLEMS FOR A QUASILINEAR PARABOLIC SYSTEM  

E-Print Network (OSTI)

INITIAL BOUNDARY VALUE PROBLEMS FOR A QUASILINEAR PARABOLIC SYSTEM IN THREE-PHASE CAPILLARY FLOW problems for a quasi- linear parabolic system motivated by three-phase ow in porous medium in the presence quasilinear parabolic sys- tems of the form (1.1) u t + f(u) x = (B(u)u x ) x ; 0

266

Convergence properties of the local defect correction method for parabolic  

E-Print Network (OSTI)

Convergence properties of the local defect correction method for parabolic problems R. Minero , H for parabolic problems presented in [14]. We derive a general expression for the iteration matrix of the method, domain decomposition and regridding. In [14] LDC is generalized to solve parabolic partial differential

Eindhoven, Technische Universiteit

267

Parabolic PDEs and Deterministic Games Robert V. Kohn  

E-Print Network (OSTI)

Parabolic PDEs and Deterministic Games Robert V. Kohn Courant Institute, NYU Joint work with Sylvia Serfaty ICIAM07, Zurich, July 2007 Robert V. Kohn Courant Institute, NYU Parabolic PDEs and Deterministic. Kohn Courant Institute, NYU Parabolic PDEs and Deterministic Games #12;Goals and perspective Part 1

268

Generation of parabolic pulses and applications for optical telecommunications  

E-Print Network (OSTI)

Generation of parabolic pulses and applications for optical telecommunications Christophe Finot 1.Finot@u-bourgogne.fr ABSTRACT Parabolic pulses in optical fibers have stimulated an increasing number of applications. We review amplifiers, optical pulse processing techniques 1. INTRODUCTION Parabolic pulse generation and propagation

Paris-Sud XI, Université de

269

Di usive Kinetic Explicit Schemes for Nonlinear Degenerate Parabolic Systems  

E-Print Network (OSTI)

Di#11;usive Kinetic Explicit Schemes for Nonlinear Degenerate Parabolic Systems #3; D. Aregba parabolic systems. These schemes are based on discrete BGK models where both characteristic velocities. Evje and K.H. Karlsen [15] and of M. Espedal and K.H. Karlsen [14]. For the theory of general parabolic

270

Curvilinear parabolic approximation for surface wave transformation with wavecurrent interaction  

E-Print Network (OSTI)

Curvilinear parabolic approximation for surface wave transformation with wave­current interaction not be an appropriate method for the purpose of simplifying the curvilinear parabolic approximation of the vector form of the wave­current equation given by Kirby [Higher-order approximations in the parabolic equation method

Kirby, James T.

271

Theory of parabolic pulse generation in tapered Anton I. Latkin  

E-Print Network (OSTI)

Theory of parabolic pulse generation in tapered fiber Anton I. Latkin Institute of Automation and differences between high-power parabolic pulse generation in an active me- dium and in tapered fiber of parabolic pulse generation without an external pump and determine the limita- tions of this approach. © 2007

Turitsyn, Sergei K.

272

Parabolic surfaces in hyperbolic space with constant Gaussian curvature  

E-Print Network (OSTI)

Parabolic surfaces in hyperbolic space with constant Gaussian curvature Rafael L´opez Departamento@ugr.es Keywords: hyperbolic space, parabolic surface, Gaussian curvature MSC 2000 subject classification: 53A10, 53C45 Abstract A parabolic surface in hyperbolic space H3 is a surface invariant by a group

López, Rafael

273

On Parallel Asynchronous HighOrder Solutions of Parabolic PDEs  

E-Print Network (OSTI)

On Parallel Asynchronous High­Order Solutions of Parabolic PDEs appeared in Numerical Algorithms Parabolic PDEs. They are asynchronous in the sense that each processor is allowed to advance at its own and synchronous finite difference methods, parabolic finite difference approximations with constant coefficients

Averbuch, Amir

274

Compound parabolic concentrators for narrowband wireless infrared receivers  

E-Print Network (OSTI)

Compound parabolic concentrators for narrowband wireless infrared receivers Keang-Po Ho Joseph M and hollow compound parabolic concentrators (CPCs), for use in free-space infrared communication receivers terms: compound parabolic concentrators (CPCs); optical bandpass fil- ters; Monte Carlo ray tracing

Kahn, Joseph M.

275

Rotational and Parabolic Surfaces in PSL2(R, ) and Applications  

E-Print Network (OSTI)

Rotational and Parabolic Surfaces in PSL2(R, ) and Applications By Carlos Espinoza Pe~nafiel 1 of either rotational isometries or parabolic isometries, immersed into the homogeneous manifold PSL2(R, ). Also, we give some applications. Keywords. Constant mean curvature. Rotational surfaces. Parabolic

Paris-Sud XI, Université de

276

FINITE DIFFERENCE METHODS FOR THE WIDE-ANGLE `PARABOLIC' EQUATION  

E-Print Network (OSTI)

FINITE DIFFERENCE METHODS FOR THE WIDE-ANGLE `PARABOLIC' EQUATION GEORGIOS AKRIVIS Abstract. We consider a model initial and boundary value problem for the wide-angle `parabolic' equation Lur = icu, the wide-angle `parabolic'equation of underwater acoustics. Given R > 0, µ 0, > 0, , and q real

Akrivis, Georgios

277

Parabolic resonances and instabilities Vered Rom-Kedara)  

E-Print Network (OSTI)

Parabolic resonances and instabilities Vered Rom-Kedara) Department of Applied Mathematics 1996; accepted for publication 30 August 1996 A parabolic resonance is formed when an integrable two-degrees-of-freedom d.o.f. Hamiltonian system possessing a circle of parabolic fixed points is perturbed. It is proved

278

PARABOLIC WAVE COMPUTATIONS IN NON-ORTHOGONAL COORDINATE  

E-Print Network (OSTI)

· PARABOLIC WAVE COMPUTATIONS IN NON-ORTHOGONAL COORDINATE SYSTEMS By James T. Kirby,1 Associate Member, ASCE ABSTRACT: A recent development of a parabolic equation method for wave prop- agation developed in applying the parabolic equation method (PEM) for surface wave propagation in non

Kirby, James T.

279

THE STRUCTURE OF TWO-PARABOLIC SPACE: PARABOLIC DUST AND ITERATION.  

E-Print Network (OSTI)

Abstract. A non-elementary Möbius group generated by twoparabolics is determined up to conjugation by one complex parameter and the parameter space has been extensively studied. In this paper, we use the results of [7] to obtain an additional structure for the parameter space, which we term the two-parabolic space. This structure allows us to identify groups that contain additional conjugacy classes of primitive parabolics, which following [14] we call parabolic dust groups, non-free groups off the real axis, and groups that are both parabolic dust and non-free; some of these contain Z × Z subgroups. The structure theorem also attaches additional geometric structure to discrete and non-discrete groups lying in given regions of the parameter space including a new explicit construction of some non-classical T-Schottky groups. 1.

Jane Gilman

2007-01-01T23:59:59.000Z

280

On a parabolic operator of dissipative systems  

E-Print Network (OSTI)

A parabolic integro differential operator operator L suitable to describe many phenomena in various physical fields,is considered. By means of equivalence between L and the third order equation which describe the evolution inside an exponentially shaped Josephson junction (ESJJ), an asymptotic analysis for (ESJJ) is achieved, evaluating explicitly boundary contributions related to the Dirichlet problem.

Monica De Angelis

2013-07-07T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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.
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281

Parabolic systems with coupled boundary conditions  

E-Print Network (OSTI)

We consider elliptic operators with operator-valued coefficients and discuss the associated parabolic problems. The unknowns are functions with values in a Hilbert space $W$. The system is equipped with a general class of coupled boundary conditions of the form $f_{|\\partial\\Omega}\\in \\mathcal Y$ and $\\frac{\\partial f}{\\partial \

Stefano Cardanobile; Delio Mugnolo

2008-12-19T23:59:59.000Z

282

Side-by-side comparisons of evacuated compound parabolic concentrator and flat plate solar collector systems  

SciTech Connect

Three liquid-based solar heating systems employing different types of solar collectors were tested side by side near Chicago, Illinois for one year. The three different types of collectors were: a flat plate collector with a black-chrome coated absorber plate and one low-iron glass cover; an evacuated-tube compound parabolic concentrator (CPC) with a concentration ratio of 1.1, oriented with tubes and troughs along a north-south axis; and an evacuated-tube CPC collector with a concentration ratio of 1.3 and one low-iron glass cover, with tubes and troughs oriented along an east-west axis. Results indicate that the flat plate collector system was the most efficient during warm weather, but the CPC systems were more efficient during cold weather, but the CPC systems were more efficient during cold weather, and the CPC systems operated under conditions too adverse for the flat plate collector. The computer simulation model ANSIM was validated by means of the side-by-side tests. The model uses analytical solutions to the storage energy balance. ANSIM is compared with the general simulation TRNSYS. (LEW)

McGarity, A.E.; Allen, J.W.; Schertz, W.W.

1983-10-01T23:59:59.000Z

283

A Non-Pyramidal Rectangular-to-Trough Waveguide Transition and Pattern Reconfigurable Trough Waveguide Antenna  

E-Print Network (OSTI)

Trough waveguides (TWG) have been utilized in a variety of radio frequency (RF) and other related applications including radar, the treatment of hypothermia and in the generation of plasmas. Perturbing the guided wave in these structures with blocks, rods, dielectrics, and other structures can create reconfigurable periodic line sources. These trough waveguide antennas (TWA) are then capable of providing both fixedfrequency and frequency-dependent beam steering. This was originally performed using electro-mechanical “cam-and-gear” mechanisms. Previous work related to the excitation of TWG and the performance of TWA topologies are limited when compared to more common antenna designs, yet they possess many desirable features that can be exploited in a modern system. This thesis will examines an S-band rectangular-to-trough waveguide transition and trough guide antenna that has been designed for broadband reconfigurable antenna applications considering as well the airflow characteristics for sensing applications. The design, fabrication, and electromagnetic performance (mode conversion, impedance matching, and antenna performance) are discussed, including the use of metallic cantilever perturbations placed along the troughguide sidewalls that are designed to provide improved impedance matching when steering the beam from the backward quadrant through broadside, towards the forward quadrant. Impedance matching techniques such as use of circular holes at the edge of each actuated cantilever are used to reduce power reflections and provide a low voltage standing wave ratio (VSWR) along the S-band. Finite element simulations will provide a demonstration of the airflow and turbulence characteristics throughout the entire structure, where the metallic cantilevers are used to manipulate the flow of air, to distribute it across the surfaces of the structure better and improve its potential for sensing operations.

Loizou, Loizos

2010-12-01T23:59:59.000Z

284

THE CHERN CHARACTER OF A PARABOLIC BUNDLE, AND A PARABOLIC REZNIKOV THEOREM IN THE CASE OF FINITE ORDER AT INFINITY  

E-Print Network (OSTI)

In this paper, we obtain an explicit formula for the Chern character of a locally abelian parabolic bundle in terms of its constituent bundles. Several features and variants of parabolic structures are discussed. Parabolic bundles arising from logarithmic connections form an important class of examples. As an application, we consider the situation when the local monodromies are semi-simple and are of finite order at infinity. In this case the parabolic Chern classes of the associated locally abelian parabolic bundle are deduced to be zero in the rational Deligne cohomology in degrees ? 2.

Jaya Nn Iyer; Carlos T Simpson

2007-01-01T23:59:59.000Z

285

A Hot Plate Solar Cooker with Electricity Generation - Combining a Parabolic Trough Mirror with a Sidney Tube and Heat Pipe  

Science Conference Proceedings (OSTI)

Solar cookers supply clean and sustainable energy for cooking and so limit the use of wood or charcoal. A new type of solar cooker is developed with a hot plate. The hot plate offers comfortable access to the food under preparation. The hot plate opens ... Keywords: Sidney Tube, TEG, heat pipe, hot plate, solar cooker

A. D. J. Kaasjager; G. P. G. Moeys

2012-10-01T23:59:59.000Z

286

Fig. 1. Artist's concept of the 1-D parabolic cylinder reflector. The re-flector has a parabolic shape in the short dimension and a flat profile in  

E-Print Network (OSTI)

Fig. 1. Artist's concept of the 1-D parabolic cylinder reflector. The re- flector has a parabolic [1]. A stationary linear parabolic reflector with a diameter of 1.6 m and a length of 2 m would

Ruf, Christopher

287

ECOLOGICAL CONSIDERATIONS OF THE SOLAR ALTERNATIVE  

E-Print Network (OSTI)

are two main types, the parabolic trough collector and thereceiver collector. The parabolic trough focuses sunlightfavored over the parabolic trough for large scale power

Davidson, M.

2010-01-01T23:59:59.000Z

288

Performance Analysis of XCPC Powered Solar Cooling Demonstration Project  

E-Print Network (OSTI)

Figure 6 – Parabolic Trough Collector……………………………………………………..temperature collectors (parabolic trough, linear Fresnel,0.44 [16], and a parabolic trough system in Pennsylvania

Widyolar, Bennett

2013-01-01T23:59:59.000Z

289

A Better Steam Engine: Designing a Distributed Concentrating Solar Combined Heat and Power System  

E-Print Network (OSTI)

2002). Advances in parabolic trough solar power technology.use comparable to a parabolic trough with air cooling sincethe working fluid in parabolic trough collectors is in the

Norwood, Zachary Mills

2011-01-01T23:59:59.000Z

290

Alternative Energy Development and China's Energy Future  

E-Print Network (OSTI)

Cycle Assessment of a Parabolic Trough Concentrating Solarhave started using parabolic troughs and Australia haveas solar towers and parabolic troughs. Thus far, China has

Zheng, Nina

2012-01-01T23:59:59.000Z

291

Advanced Organic Vapor Cycles for Improving Thermal Conversion Efficiency in Renewable Energy Systems  

E-Print Network (OSTI)

circulating in a parabolic trough field which can reachas linear Fresnel lens and parabolic troughs) and high gradegeneration Though the parabolic trough type collector

Ho, Tony

2012-01-01T23:59:59.000Z

292

Poincar'e polynomial of the moduli spaces of parabolic bundles  

E-Print Network (OSTI)

Poincar'e polynomial of the moduli spaces of parabolic bundles Yogish I. Holla March 7, 2000 School of the moduli spaces of semi­stable parabolic bundles on a curve. The quasi parabolic analogue of the Siegel for determine the Betti numbers of the moduli of semistable parabolic bundles on a curve (when parabolic semi

Holla, Yogish I.

293

The West Coast Thermal Trough: Climatology and Synoptic Evolution  

Science Conference Proceedings (OSTI)

Although the West Coast thermal trough (WCTT) is the most important mesoscale feature over the U.S. west coast during the warm season, its initiation, evolution, and structure are not well understood. Originating in the southwest United States, ...

Matthew C. Brewer; Clifford F. Mass; Brian E. Potter

2012-12-01T23:59:59.000Z

294

Life History of Mobile Troughs in the Upper Westerlies  

Science Conference Proceedings (OSTI)

Increasing evidence indicates that surface cyclogenesis is predominantly a response to the approach of a preexisting trough at upper levels. A question then arises about the origin of the upper-level predecessor. As an initial approach to this ...

Frederick Sanders

1988-12-01T23:59:59.000Z

295

Composite Trough Evolution of Selected West Pacific Extratropical Cyclones  

Science Conference Proceedings (OSTI)

The observed vertical structures of the trough axes for 27 extratropical cyclones are presented. This study is motivated by results from a simple theoretical model. Two observing times during the cyclone life cycle are shown: prior to development ...

Richard Grotjahn

1996-07-01T23:59:59.000Z

296

post-pareto analysis for multiobjective parabolic control systems  

E-Print Network (OSTI)

Jul 29, 2012 ... POST-PARETO ANALYSIS FOR MULTIOBJECTIVE PARABOLIC CONTROL SYSTEMS. Henri Bonnel (bonnel ***at*** univ-nc.nc). Abstract: In ...

297

Estimates in the Generalized Morrey Space for Linear Parabolic Systems.  

E-Print Network (OSTI)

??The purpose of the this paper is to study the parabolic system uti - D_?(aij??D_?uj) = -div fi in the generalized Morrey Space L_?2,? .… (more)

McBride, Matthew Scott

2007-01-01T23:59:59.000Z

298

Betting Big on Baseload  

Science Conference Proceedings (OSTI)

Some risks are unavoidable. Rather than pretending to forecast the future, successful companies will need to learn from other cyclical, capital-intensive industries: investing wisely, learning to build asset portfolios consonant with their owners' appetite for risk, and relentlessly seeking opportunities to improve efficiency. (author)

Gabaldon, Daniel; Spiegel, Eric; Van den Berg, Joe

2006-08-15T23:59:59.000Z

299

Numerical Schemes for Rough Parabolic Equations  

SciTech Connect

This paper is devoted to the study of numerical approximation schemes for a class of parabolic equations on (0,1) perturbed by a non-linear rough signal. It is the continuation of Deya (Electron. J. Probab. 16:1489-1518, 2011) and Deya et al. (Probab. Theory Relat. Fields, to appear), where the existence and uniqueness of a solution has been established. The approach combines rough paths methods with standard considerations on discretizing stochastic PDEs. The results apply to a geometric 2-rough path, which covers the case of the multidimensional fractional Brownian motion with Hurst index H>1/3.

Deya, Aurelien, E-mail: deya@iecn.u-nancy.fr [Universite de Nancy 1, Institut Elie Cartan Nancy (France)

2012-04-15T23:59:59.000Z

300

DEGENERATE-PARABOLIC PARTIAL DIFFERENTIAL EQUATIONS WITH UNBOUNDED COEFFICIENTS, MARTINGALE PROBLEMS, AND A  

E-Print Network (OSTI)

DEGENERATE-PARABOLIC PARTIAL DIFFERENTIAL EQUATIONS WITH UNBOUNDED COEFFICIENTS, MARTINGALE four intertwined problems, motivated by mathematical finance, concerning degenerate-parabolic partial differential operators and degenerate diffusion processes. First, we consider a parabolic partial differential

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


301

Solar parabolic dish annual technology evaluation report. Fiscal year 1982  

DOE Green Energy (OSTI)

This report summarizes the activities of the JPL Solar Thermal Power Systems Parabolic Dish Project for FY 1982. Included are discussions on designs of module development including their concentrator, receiver, and power conversion subsystems. Analyses and test results, along with progress on field tests, Small Community Experiment System development, and tests at the Parabolic Dish Test Site are also included.

Not Available

1983-09-15T23:59:59.000Z

302

VOLUME 46 JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY NOVEMBER 2007 Supplying Baseload Power and Reducing Transmission Requirements by Interconnecting Wind Farms  

E-Print Network (OSTI)

Wind is the world’s fastest growing electric energy source. Because it is intermittent, though, wind is not used to supply baseload electric power today. Interconnecting wind farms through the transmission grid is a simple and effective way of reducing deliverable wind power swings caused by wind intermittency. As more farms are interconnected in an array, wind speed correlation among sites decreases and so does the probability that all sites experience the same wind regime at the same time. The array consequently behaves more and more similarly to a single farm with steady wind speed and thus steady deliverable wind power. In this study, benefits of interconnecting wind farms were evaluated for 19 sites, located in the midwestern United States, with annual average wind speeds at 80 m above ground, the hub height of modern wind turbines, greater than 6.9 m s ?1 (class 3 or greater). It was found that an average of 33 % and a maximum of 47 % of yearly averaged wind power from interconnected farms can be used as reliable, baseload electric power. Equally significant, interconnecting multiple wind farms to a common point and then connecting that point to a far-away city can allow the long-distance portion of transmission capacity to be reduced, for example, by 20 % with only a 1.6 % loss of energy. Although most parameters, such as intermittency, improved less than linearly as the number of interconnected sites increased, no saturation of the benefits

Cristina L. Archer; Mark; Z. Jacobson

2006-01-01T23:59:59.000Z

303

Parabolic refined invariants and Macdonald polynomials  

E-Print Network (OSTI)

A string theoretic derivation is given for the conjecture of Hausel, Letellier, and Rodriguez-Villegas on the cohomology of character varieties with marked points. Their formula is identified with a refined BPS expansion in the stable pair theory of a local root stack, generalizing previous work of the first two authors in collaboration with G. Pan. Haiman's geometric construction for Macdonald polynomials is shown to emerge naturally in this context via geometric engineering. In particular this yields a new conjectural relation between Macdonald polynomials and refined local orbifold curve counting invariants. The string theoretic approach also leads to a new spectral cover construction for parabolic Higgs bundles in terms of holomorphic symplectic orbifolds.

Wu-yen Chuang; Duiliu-Emanuel Diaconescu; Ron Donagi; Tony Pantev

2013-11-14T23:59:59.000Z

304

Steam generation in compound parabolic concentrator collectors  

SciTech Connect

This report describes the advantages of generating steam directly in a nonimaging compound parabolic concentrator (CPC) collector rather than using a heat-transfer fluid and a secondary heat exchanger. The predicted performance advantages from generating steam directly in CPC collectors are significant, and that performance has ben verified using a collector built and tested at Argonne National Laboratory. The collector and the method used to test its operation in a steam-generating mode are described. Test results are included for a 6.4-m/sup 2/ array of evacuated tube collectors with an advanced absorber coating, silver reflectors, and tubes oriented in a north-south configuration. Also described are the test methods and results for indoor testing for heat loss by the collectors and outdoor testing of their instantaneous optical efficiency.

Allen, J.W.; Schertz, W.W.; Wantroba, A.S.

1985-08-01T23:59:59.000Z

305

ENERGY & ENVIRONMENT DIVISION ANNUAL REPORT, 1977  

E-Print Network (OSTI)

receiver and the parabolic trough. Once concentrated, theEnergy System employing parabolic trough col- lectors. The

Budnitz, R.J.

2011-01-01T23:59:59.000Z

306

Solar thermal parabolic dish systems: technology and applications  

DOE Green Energy (OSTI)

This presentation surveys the status and some probable future courses of development of parabolic dish solar collector technology and some of the near-term and long-range applications of the technology. Included are fundamentals of the technology, descriptions of current collectors with particular emphasis on the types developed within the Department of Energy's Solar Thermal Program, descriptions of current systems and applications, key technical issues and tradeoff considerations which will affect the competition between parabolic dish systems and other solar thermal technologies, and, finally, a discussion of future possibilities for the development of parabolic dish technology.

Leonard, J.A.

1984-05-01T23:59:59.000Z

307

Self-similar parabolic plasmonic beams Arthur R. Davoyan,1,2,  

E-Print Network (OSTI)

Self-similar parabolic plasmonic beams Arthur R. Davoyan,1,2, * Sergei K. Turitsyn,3 and Yuri S support stable self-similar plasmonic waves with a parabolic profile. Simplicity of a parabolic shape on availability of the basic waveforms with simple shapes, e.g., square top- flat, triangular, parabolic, and so

Turitsyn, Sergei K.

308

Northern Hemisphere 500-hPa Trough Merger and Fracture: A Climatology and Case Study  

Science Conference Proceedings (OSTI)

The results of an objective climatology of 500hPa trough merger (defined as the amalgamation of two initially separate vorticity maxima) and trough fracture (defined as the splitting of a single vorticity center into two separate vorticity ...

Devin B. Dean; Lance F. Bosart

1996-12-01T23:59:59.000Z

309

Dynamical and Physical Processes Leading to Tropical Cyclone Intensification under Upper-Level Trough Forcing  

Science Conference Proceedings (OSTI)

The rapid intensification of Tropical Cyclone (TC) Dora (2007, southwest Indian Ocean) under upper-level trough forcing is investigated. TC–trough interaction is simulated using a limited-area operational numerical weather prediction model. The ...

Marie-Dominique Leroux; Matthieu Plu; David Barbary; Frank Roux; Philippe Arbogast

2013-08-01T23:59:59.000Z

310

Prefrontal Troughs over Southern Australia. Part II: A Case Study of Frontogenesis  

Science Conference Proceedings (OSTI)

A case study of frontogenesis within a surface prefrontal trough over southern Australia is presented. The trough developed ahead of a surface cold front and, over a period of approximately 24 h, intensified into a mature summertime frontal ...

B. N. Hanstrum; K. J. Wilson; S. L. Barrell

1990-03-01T23:59:59.000Z

311

Observational Analysis of an Upper-Level Inverted Trough during the 2004 North American Monsoon Experiment  

Science Conference Proceedings (OSTI)

Upper-level inverted troughs (IVs) associated with midlatitude breaking Rossby waves or tropical upper-troposphere troughs (TUTTs) have been identified as important contributors to the variability of rainfall in the North American monsoon (NAM) ...

Zachary O. Finch; Richard H. Johnson

2010-09-01T23:59:59.000Z

312

Shock stability analysis for Parabolized Navier-Stokes equations  

Science Conference Proceedings (OSTI)

Parabolized Navier-Stokes (PNS) techniques have been receiving increasing attention as an effective method for treating two and three dimensional high-speed gas flows. Since the method involves marching in a ''time like'' coordinate the problem size ...

Douglas D. Cline; Graham F. Carey

1988-12-01T23:59:59.000Z

313

Parabolic Equations and Markov Processes Over p-adic Fields  

E-Print Network (OSTI)

We construct and study a fundamental solution of Cauchy's problem for p-adic parabolic equations of a certain the type. The fundamental solution is the transition density of a p-adic Markov process.

W. A. Zuniga-Galindo

2006-12-11T23:59:59.000Z

314

Application of the Piecewise Parabolic Method (PPM) to Meteorological Modeling  

Science Conference Proceedings (OSTI)

The Piecewise Parabolic Method (PPM), a numerical technique developed in astrophysics for modeling fluid flows with strong shocks and discontinuities is adapted for treating sharp gradients in small-scale meteorological flows. PPM differs ...

Richard L. Carpenter Jr.; Kelvin K. Droegemeier; Paul R. Woodward; Carl E. Hane

1990-03-01T23:59:59.000Z

315

CLASSICAL TWO-PARABOLIC T-SCHOTTKY GROUPS  

E-Print Network (OSTI)

A T-Schottky group is a discrete group of Möbius transformations whose generators identify pairs of possibly-tangent Jordan curves on the complex sphere ? ?. If the curves are Euclidean circles, then the group is termed classical T-Schottky. We describe the boundary of the space of classical T-Schottky groups affording two parabolic generators within the larger parameter space of all-Schottky groups with two parabolic generators. This boundary is surprisingly different from that of the larger space. It is analytic, while the boundary of the larger space appears to be fractal. Approaching the boundary of the smaller space does not correspond to pinching; circles necessarily become tangent, but extra parabolics need not develop. As an application, we construct an explicit one parameter family of two parabolic generator non-classical T-Schottky groups.

Jane Gilman; Peter Waterman

2006-01-01T23:59:59.000Z

316

Solar parabolic dish technology annual evaluation report. Fiscal year 1983  

DOE Green Energy (OSTI)

This report summarizes the activities of the JPL Solar Thermal Power Systems Parabolic Dish Project for FY 1983. Included are discussions on designs of module development including their concentrator, receiver, and power conversion subsystem together with a separate discussion of concentrator development. Analyses and test results, along with progress on field tests, Small Community Experiment system development, and tests at the Parabolic Dish Test Site are also included.

Not Available

1984-04-15T23:59:59.000Z

317

Parabolic Whittaker Functions and Topological Field Theories I  

E-Print Network (OSTI)

First, we define a generalization of the standard quantum Toda chain inspired by a construction of quantum cohomology of partial flags spaces GL(\\ell+1)/P, P a parabolic subgroup. Common eigenfunctions of the parabolic quantum Toda chains are generalized Whittaker functions given by matrix elements of infinite-dimensional representations of gl(\\ell+1). For maximal parabolic subgroups (i.e. for P such that GL(\\ell+1)/P=\\mathbb{P}^{\\ell}) we construct two different representations of the corresponding parabolic Whittaker functions as correlation functions in topological quantum field theories on a two-dimensional disk. In one case the parabolic Whittaker function is given by a correlation function in a type A equivariant topological sigma model with the target space \\mathbb{P}^{\\ell}. In the other case the same Whittaker function appears as a correlation function in a type B equivariant topological Landau-Ginzburg model related with the type A model by mirror symmetry. This note is a continuation of our project of establishing a relation between two-dimensional topological field theories (and more generally topological string theories) and Archimedean (\\infty-adic) geometry. From this perspective the existence of two, mirror dual, topological field theory representations of the parabolic Whittaker functions provide a quantum field theory realization of the local Archimedean Langlands duality for Whittaker functions. The established relation between the Archimedean Langlands duality and mirror symmetry in two-dimensional topological quantum field theories should be considered as a main result of this note.

Anton Gerasimov; Dimitri Lebedev; Sergey Oblezin

2010-02-12T23:59:59.000Z

318

POTTY ET AL. Simulation of Boundary Layer Structure over the Indian Summer Monsoon Trough  

E-Print Network (OSTI)

POTTY ET AL. Simulation of Boundary Layer Structure over the Indian Summer Monsoon Trough during The planetary boundary layer (PBL) structure over the Indian summer monsoon trough region has been simulated using a regional numerical model during the passage of a monsoon depression along the monsoon trough

Raman, Sethu

319

Linkages between turbidites in the southern Okinawa Trough and submarine earthquakes  

E-Print Network (OSTI)

Linkages between turbidites in the southern Okinawa Trough and submarine earthquakes Chih-An Huh,1 of the southern Okinawa Trough and its vicinity were dated by 210 Pb and further constrained by 137 Cs and inter.-T. Liang, and C.-Y. Ling (2004), Linkages between turbidites in the southern Okinawa Trough and submarine

Huh, Chih-An

320

CX-003976: Categorical Exclusion Determination | Department of Energy  

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

76: Categorical Exclusion Determination 76: Categorical Exclusion Determination CX-003976: Categorical Exclusion Determination Development of a High-Concentration Low-Cost Parabolic Trough System for Baseload Concentrated Solar Power Generation CX(s) Applied: A9, B5.1 Date: 09/20/2010 Location(s): Arvada, Colorado Office(s): Energy Efficiency and Renewable Energy, Golden Field Office The Department of Energy is proposing to provide federal funding to SkyFuel to develop and demonstrate an advanced low-cost Concentrated Solar Power (CSP) solar collector, using higher-concentration, higher-temperature parabolic trough technology, with the ultimate goal of reducing the cost of baseload utility-scale solar power generation. DOCUMENT(S) AVAILABLE FOR DOWNLOAD CX-003976.pdf More Documents & Publications

Note: This page contains sample records for the topic "baseload parabolic trough" 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 study of mobile trough genesis over the Yellow Sea - East China Sea region  

E-Print Network (OSTI)

The purpose of this study was to understand the mechanisms responsible for the formation of mobile troughs over a prolific source region in the Yellow Sea and East China Sea. Two mobile troughs which intensified significantly after formation were analyzed. The troughs were selected from the objective climatology of mobile troughs by Lefevre and Nielsen-Gammon (1995). A quasigeostrophic potential vorticity (QGPV) and associated piecewise tendency diagnosis (PTD) technique developed by NielsenGammon and Lefevre (1995) was used to quantitatively analyze the dynamics of mobile trough formation. The PTD technique involves the inversion of QGPV and QGPV advection. A qualitative approach using dynamical tropopause maps of constant Ertel's potential vorticity (EPV) was utilized in conjunction with the QGPV method. It was determined that downstream development was the primary mechanism in initiating both mobile troughs. Type A cyclogenesis was not evident in either trough genesis event. A surface cyclone aided the development of one of the mobile troughs, but the cyclone had developed prior to the formation of the mobile trough. Baroclinic processes and large-scale interactions played lesser roles in one trough, but were not important in the other trough. Barotropic deformation modulated the strength of the second mobile trough by changing the shape of the associated QGPV anomaly. Vertical superposition was important in strengthening the latter stages of the life of the mobile trough, due to two jets superimposing over the mobile trough. Subjective analysis of tropopause maps of both trough genesis events showed the downstream development process as the growth of a new wave by cross-contour advection of potential temperature due to a pre-existing upstream disturbance.

Komar, Keith Nickolas

1997-01-01T23:59:59.000Z

322

Does the fully parabolic quasilinear 1D Keller-Segel system enjoy long-time asymptotics analogous to its parabolic-elliptic simplification?  

E-Print Network (OSTI)

We show that the one-dimensional fully parabolic Keller-Segel system with nonlinear diffusion possesses global-in-time solutions, provided the nonlinear diffusion is equal to (1+u)^{-\\alpha}, for \\alpha parabolic-elliptic case to the fully parabolic one. However, in the parabolic-elliptic case the above mentioned integrability condition on nonlinear diffusion sharply distinguishes between global existence and blowup cases. We are unable to recover the entire global existence counterpart of this result in a fully parabolic case.

Jan Burczak; Tomasz Cie?lak; Cristian Morales-Rodrigo

2011-11-07T23:59:59.000Z

323

Interpretation of parabolic arcs in pulsar secondary spectra  

E-Print Network (OSTI)

Pulsar dynamic spectra sometimes show organised interference patterns; these patterns have been shown to have power spectra which often take the form of parabolic arcs, or sequences of inverted parabolic arclets whose apexes themselves follow a parabolic locus. Here we consider the interpretation of these arc and arclet features. We give a statistical formulation for the appearance of the power spectra, based on the stationary phase approximation to the Fresnel-Kirchoff integral. We present a simple analytic result for the power-spectrum expected in the case of highly elongated images, and a single-integral analytic formulation appropriate to the case of axisymmetric images. Our results are illustrated in both the ensemble-average and snapshot regimes. Highly anisotropic scattering appears to be an important ingredient in the formation of the observed arclets.

Mark Walker; Don Melrose; Dan Stinebring; Chengmin Zhang

2004-03-25T23:59:59.000Z

324

The first Chern form on moduli of parabolic bundles  

E-Print Network (OSTI)

For moduli space of stable parabolic bundles on a compact Riemann surface, we derive an explicit formula for the curvature of its canonical line bundle with respect to Quillen's metric and interpret it as a local index theorem for the family of dbar-operators in associated parabolic endomorphism bundles. The formula consists of two terms: one standard (proportional to the canonical Kaehler form on the moduli space), and one nonstandard, called a cuspidal defect, that is defined by means of special values of the Eisenstein-Maass series. The cuspidal defect is explicitly expressed through curvature forms of certain natural line bundles on the moduli space related to the parabolic structure. We also compare our result with Witten's volume computation.

Leon A. Takhtajan; Peter G. Zograf

2006-09-26T23:59:59.000Z

325

Universal estimate of the gradient for parabolic equations  

E-Print Network (OSTI)

We suggest a modification of the estimate for weighted Sobolev norms of solutions of parabolic equations such that the matrix of the higher order coefficients is included into the weight for the gradient. More precisely, we found the upper limit estimate that can be achieved by variations of the zero order coefficient. As an example of applications, an asymptotic estimate was obtained for the gradient at initial time. The constant in the estimates is the same for all possible choices of the dimension, domain, time horizon, and the coefficients of the parabolic equation. As an another example of application, existence and regularity results are obtained for parabolic equations with time delay for the gradient.

Nikolai Dokuchaev

2007-09-06T23:59:59.000Z

326

Nonlocal Operators, Parabolic-type Equations, and Ultrametric Random Walks  

E-Print Network (OSTI)

In this article we introduce a new type of nonlocal operators and study the Cauchy problem for certain parabolic-type pseudodifferential equations naturally associated to these operators. Some of these equations are the p-adic master equations of certain models of complex systems introduced by Avetisov et al. The fundamental solutions of these parabolic-type equations are transition functions of random walks on the n-dimensional vector space over the field of p-adic numbers. We study some properties of these random walks, including the first passage time.

L. F. Chacón-Cortes; W. A. Zúñiga-Galindo

2013-08-22T23:59:59.000Z

327

The parabolic trigonometric functions and the Chebyshev radicals  

E-Print Network (OSTI)

The parabolic trigonometric functions have recently been introduced as an intermediate step between circular and hyperbolic functions. They have been shown to be expressible in terms of irrational functions, linked to the solution of third degree algebraic equations. We show the link of the parabolic trigonometric functions with the Chebyshev radicals and also prove that further generalized forms of trigonometric functions, providing the natural solutions of the quintic algebraic equation, can be defined. We also discuss the link of this family of functions with the modular elliptic functions. 1

G. Dattoli; M. Migliorati; P. E. Ricci

2011-02-08T23:59:59.000Z

328

Natural convective studies within a compound parabolic concentrator enclosure  

SciTech Connect

The contribution due to natural convection within a compound parabolic concentrator enclosure has been experimentally determined. These studies have been conducted within a truncated compound parabolic concentrator having a concentration ratio of 4, a receiver width of 3.175 cm, and a length of 244.0 cm. The receiver was heated electrically while the aperture was provided with a duct that was cooled by water. The limbs of the collector were fabricated from aluminum. Temperatures were directly obtained with copper constantan thermocouples located throughout the entire enclosure and provided the basis needed to calculate the different modes of heat transfer. The constant heat flux

Tatara, R.A.

1983-01-01T23:59:59.000Z

329

Electromagnetic Casimir forces of parabolic cylinder and knife-edge geometries  

E-Print Network (OSTI)

An exact calculation of electromagnetic scattering from a perfectly conducting parabolic cylinder is employed to compute Casimir forces in several configurations. These include interactions between a parabolic cylinder and ...

Graham, Noah

330

DISCRETE TRANSPARENT BOUNDARY CONDITIONS FOR WIDE ANGLE PARABOLIC EQUATIONS IN UNDERWATER  

E-Print Network (OSTI)

DISCRETE TRANSPARENT BOUNDARY CONDITIONS FOR WIDE ANGLE PARABOLIC EQUATIONS IN UNDERWATER ACOUSTICS "parabolic" equations (WAPEs) in underwater acoustics (assuming cylindrical symmetry). Existing the discretization of transparent bottom boundary conditions. In oceanography one wants to calculate the underwater

Ehrhardt, Matthias

331

PARABOLIC BUNDLES ON ALGEBRAIC SURFACES I- THE DONALDSON–UHLENBECK COMPACTIFICATION  

E-Print Network (OSTI)

Abstract. The aim of this paper is to construct the parabolic version of the Donaldson–Uhlenbeck compactification for the moduli space of parabolic stable bundles on an algenraic surface with parabolic structures along a divisor with normal crossing singularities. We prove the non–emptiness of the moduli space of parabolic stable bundles of rank 2 and also prove the existence of components with smooth points. 1.

V. Balaji; A. Dey; R. Parthasarathi

2006-01-01T23:59:59.000Z

332

$C^{1,\\al}$ regularity of solutions to parabolic Monge-Amp\\'ere equations  

E-Print Network (OSTI)

We study interior $C^{1, \\al}$ regularity of viscosity solutions of the parabolic Monge-Amp\\'ere equation

Daskalopoulos, Panagiota

2009-01-01T23:59:59.000Z

333

BSDE driven by Dirichlet Process and Semi-linear Parabolic PDE.  

E-Print Network (OSTI)

BSDE driven by Dirichlet Process and Semi-linear Parabolic PDE. Application to Homogenization) also gives the weak solution of a semi-linear system of parabolic PDEs with a second-order divergence is associated to a divergence-form partial differential operator, and its connection with semi- linear parabolic

Paris-Sud XI, Université de

334

Operator-splitting finite element algorithms for computations of high-dimensional parabolic problems  

E-Print Network (OSTI)

Operator-splitting finite element algorithms for computations of high-dimensional parabolic t i c l e i n f o Keywords: Operator-splitting method Finite element method Parabolic equations High-dimensional problems a b s t r a c t An operator-splitting finite element method for solving high-dimensional parabolic

Ganesan, Sashikumaar

335

The parabolic Anderson model with heavy-tailed potential Peter Morters  

E-Print Network (OSTI)

The parabolic Anderson model with heavy-tailed potential Peter M¨orters Bath joint work with Remco effects can be caused by considerable irregularity of the medium? Peter M¨orters (Bath) The parabolic effects can be caused by considerable irregularity of the medium? Peter M¨orters (Bath) The parabolic

Mörters, Peter

336

ON PARABOLIC SUBGROUPS OF CLASSICAL GROUPS WITH A FINITE NUMBER OF  

E-Print Network (OSTI)

ON PARABOLIC SUBGROUPS OF CLASSICAL GROUPS WITH A FINITE NUMBER OF ORBITS ON THE UNIPOTENT RADICAL , all parabolic subgroups P of G with a finite number of orbits on the unipotent radical Pu algebraic group defined over an algebraically closed field k of characteristic 0. Let P be a parabolic

Bielefeld, University of

337

A Sparse Grid SpaceTime Discretization Scheme for Parabolic Problems  

E-Print Network (OSTI)

A Sparse Grid Space­Time Discretization Scheme for Parabolic Problems Michael Griebel, Daniel Oeltz Abstract In this paper we consider the discretization in space and time of parabolic di#erential equations. This holds in many applications due to the smoothing properties of the propagator of the parabolic PDE (heat

Bartels, Soeren

338

Parabolic equation modeling of high frequency acoustic transmission with an evolving sea surface  

E-Print Network (OSTI)

Parabolic equation modeling of high frequency acoustic transmission with an evolving sea surface J is combined with a rough surface formulation of a parabolic equation model for predicting time an approximation of the time-varying acoustic field. The wide-angle parabolic equation model manages the rough sea

Archer, Cristina Lozej

339

Convergence of Singular Limits for Multi-D Semilinear Hyperbolic Systems to Parabolic Systems  

E-Print Network (OSTI)

Convergence of Singular Limits for Multi-D Semilinear Hyperbolic Systems to Parabolic Systems systems to parabolic systems. The singular limits are studied combining Tartar's and G#19;erard of the system. Key words and phrases: Hyperbolic systems, parabolic systems, pseudodi#11;erential oper- ators

340

Parabolic Kazhdan-Lusztig R-polynomials for tight quotients of the symmetric groups 1  

E-Print Network (OSTI)

Parabolic Kazhdan-Lusztig R-polynomials for tight quotients of the symmetric groups formulas for the parabolic Kazhda* *n- Lusztig R-polynomials of the tight quotients* * to that of the Kazhdan-Lusztig polynomials. In 1987 Deodhar ([5]) introduced parabolic analogues of all

Brenti, Francesco

Note: This page contains sample records for the topic "baseload parabolic trough" 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.
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341

REMARKS ON THE PARABOLIC CURVES ON SURFACES AND ON THE MANYDIMENSIONAL M  

E-Print Network (OSTI)

REMARKS ON THE PARABOLIC CURVES ON SURFACES AND ON THE MANY­DIMENSIONAL M ¨ OBIUS--STURM THEORY V. I. Arnold V. A. Steklov Mathematical Institute August 26, 1997 Conjecture on Four Parabolic Curves of several variables) show that natural analogs of inflection points are parabolic curves of surfaces

Arnold, Vladimir Igorevich

342

Elastic parabolic equation solutions for underwater acoustic problems using seismic sources  

E-Print Network (OSTI)

Elastic parabolic equation solutions for underwater acoustic problems using seismic sources Scott D theoretic methods, and attempts to model them with fluid-bottom parabolic equation solu- tions suggest between elastic and acoustic waves, current elastic parabolic equation solutions must be modified to allow

343

Theory of Parabolic Pulse Propagation in Nonlinear Dispersion Decreasing Optical Fiber Amplifiers  

E-Print Network (OSTI)

1 Theory of Parabolic Pulse Propagation in Nonlinear Dispersion Decreasing Optical Fiber Amplifiers pulses with an initial parabolic power profile keep their shape and acquire a linear frequency chirp upon presence of linear amplification, parabolic pulses enjoy the remarkable property of representing a common

Paris-Sud XI, Université de

344

Parabolic equation solution of seismo-acoustics problems involving variations in bathymetry and sediment thickness  

E-Print Network (OSTI)

Parabolic equation solution of seismo-acoustics problems involving variations in bathymetry September 2007; accepted 27 September 2007 Recent improvements in the parabolic equation method are combined to extend this approach to a larger class of seismo-acoustics problems. The variable rotated parabolic

345

Parallelizing Implicit Algorithm for TimeDependent Problems by Parabolic Domain  

E-Print Network (OSTI)

Parallelizing Implicit Algorithm for Time­Dependent Problems by Parabolic Domain Decomposition parallel high­order algorithm for the solution of parabolic and elliptic PDE's. The parallelization decomposition,parabolic and elliptic PDEs, spectral method, lcoal Fourier bases,Green function, parallelization

Averbuch, Amir

346

HEART RATE AND BLOOD PRESSURE VARIABILITY UNDER MOON, MARS AND ZERO GRAVITY CONDITIONS DURING PARABOLIC FLIGHTS  

E-Print Network (OSTI)

PARABOLIC FLIGHTS Wouter Aerts1 , Pieter Joosen1 , Devy Widjaja1,2 , Carolina Varon1,2 , Steven Vandeput1, Belgium, Email: andre.aubert@med.kuleuven.be ABSTRACT Gravity changes during partial-G parabolic flights requires the understanding of how the CVS adapts to gravity changes. Parabolic flights are one

347

HEART RATE AND BLOOD PRESSURE VARIABILITY UNDER MOON, MARS AND ZERO GRAVITY CONDITIONS DURING PARABOLIC FLIGHTS  

E-Print Network (OSTI)

PARABOLIC FLIGHTS Wouter Aerts1 , Pieter Joosen1 , Devy Widjaja1,2 , Carolina Varon1,2 , Steven Vandeput1 Leuven, Belgium, Email: andre.aubert@med.kuleuven.be ABSTRACT Gravity changes during partial-G parabolic to reduce postflight orthostatic intolerance. Key words: parabolic flight; heart rate; blood pressure

348

Parabolic geometries and normal Weyl structures First BGG operators and special solutions  

E-Print Network (OSTI)

Parabolic geometries and normal Weyl structures First BGG operators and special solutions structures & BGG solutions #12;Parabolic geometries and normal Weyl structures First BGG operators to a parabolic geometry. The first operator in each BGG sequence defines a geometric overdetermined system

Drmota, Michael

349

Harnack Inequalities for NonNegative Solutions to Degenerate and Singular Parabolic Partial  

E-Print Network (OSTI)

Harnack Inequalities for Non­Negative Solutions to Degenerate and Singular Parabolic Partial, Local Behaviour of Solutions of Quasi­linear Parabolic Equations, Arch. Rat. Mech. Anal 25, (1967), 81 Parabolic Equations with Measurable Coefficients, Arch. Rational. Mech. Anal. 118, (1992), 257­271. [4] E

Gianazza, Ugo

350

Influence of the initial phase profile on the asymptotic self-similar parabolic dynamics  

E-Print Network (OSTI)

Influence of the initial phase profile on the asymptotic self-similar parabolic dynamics Christophe phase profile on the convergence towards asymptotic self-similar parabolic shape. More precisely, based on numerical simulations, we discuss the impact of an initial linear chirp and a phase shift. If the parabolic

Paris-Sud XI, Université de

351

ERROR ESTIMATES FOR FINITE DIFFERENCE METHODS FOR A WIDE-ANGLE `PARABOLIC' EQUATION  

E-Print Network (OSTI)

ERROR ESTIMATES FOR FINITE DIFFERENCE METHODS FOR A WIDE-ANGLE `PARABOLIC' EQUATION G. D. AKRIVIS-value problem for a third-order p.d.e., a wide-angle `parabolic' equation frequently used in underwater. wide-angle `parabolic' equation, Underwater Acoustics, finite difference error esti- mates, interface

Akrivis, Georgios

352

IMPLICIT-EXPLICIT MULTISTEP FINITE ELEMENT METHODS FOR NONLINEAR PARABOLIC PROBLEMS  

E-Print Network (OSTI)

IMPLICIT-EXPLICIT MULTISTEP FINITE ELEMENT METHODS FOR NONLINEAR PARABOLIC PROBLEMS Georgios boundary value problems for nonlinear parabolic equations. In space we discretize by finite element methods for the time discretization of a class of nonlinear parabolic problems of the form: Given T > 0 and u0 H, find

Akrivis, Georgios

353

Stability and Freezing of Waves in Nonlinear Hyperbolic-Parabolic Systems  

E-Print Network (OSTI)

Stability and Freezing of Waves in Nonlinear Hyperbolic-Parabolic Systems Jens Rottmann to the approximation of traveling waves in hyperbolic-parabolic systems such as the Hodgkin-Huxley model and the Fitz of this system. Note that (1.2) is parabolic in the u variable and (non-strictly) hyperbolic in the v variable

Moeller, Ralf

354

Velocity-jump processes with a finite number of speeds and their asymptotically parabolic nature  

E-Print Network (OSTI)

Velocity-jump processes with a finite number of speeds and their asymptotically parabolic nature-time behavior is described by a corresponding scalar diffusive equation of parabolic type, defined, alternative to the tradi- tional parabolic heat equation, which, on the contrary, mantains the inherent

Recanati, Catherine

355

Parabolic geometries and normal Weyl structures First BGG operators and special solutions  

E-Print Network (OSTI)

Parabolic geometries and normal Weyl structures First BGG operators and special solutions structures & BGG solutions #12;Parabolic geometries and normal Weyl structures First BGG operators the machinery of BGG sequences. Andreas Cap Weyl structures & BGG solutions #12;Parabolic geometries and normal

Drmota, Michael

356

Two parabolic equations for propagation in layered poro-elastic media  

E-Print Network (OSTI)

Two parabolic equations for propagation in layered poro-elastic media Adam M. Metzlera) Applied 10 October 2012; revised 26 March 2013; accepted 9 May 2013) Parabolic equation methods for fluid. A previous parabolic equation solution for one model of range-independent poro-elastic media [Collins et al

357

Parabolic laws of the surrounded-atom model from ab initio calculations on clusters  

E-Print Network (OSTI)

121 Parabolic laws of the surrounded-atom model from ab initio calculations on clusters A alloys, via parabolic laws which are functions of the local concentration. In this paper, using ab initio MO-CI calculations on clusters, we have shown that these parabolic laws have a microscopic electronic

Paris-Sud XI, Université de

358

Parabolic lines and caustics in weakly anisotropic solids 9iFODY##9DYU\\XN  

E-Print Network (OSTI)

117 Parabolic lines and caustics in weakly anisotropic solids 9iFODY##9DYU\\þXN *HRSK@ig.cas.cz Summary The behaviour of parabolic lines and caustics in anisotropic solids can be, in general, very, no parabolic lines appear on the S1 slowness sheet. Consequently, the S1 wave sheet displays no caustics

Cerveny, Vlastislav

359

Self-accelerating parabolic beams in quadratic nonlinear media Ido Dolev, Ana Libster, and Ady Arie  

E-Print Network (OSTI)

Self-accelerating parabolic beams in quadratic nonlinear media Ido Dolev, Ana Libster, and Ady Arie://apl.aip.org/authors #12;Self-accelerating parabolic beams in quadratic nonlinear media Ido Dolev,a) Ana Libster, and Ady present experimental observation of self-accelerating parabolic beams in quadratic nonlinear media. We

Arie, Ady

360

Repeated games for eikonal equations, integral curvature flows and non-linear parabolic  

E-Print Network (OSTI)

Repeated games for eikonal equations, integral curvature flows and non-linear parabolic integro works of Kohn and the second author (2006 and 2009): general fully non-linear parabolic integro- surfaces. For parabolic integro-differential equations, players choose smooth functions on the whole space

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "baseload parabolic trough" 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

The Nonlinear Evolution of Disturbances to a Parabolic Jet  

Science Conference Proceedings (OSTI)

It has been shown that the linearized equations for disturbances to a parabolic jet on a ? plane, with curvature Un0(y) such that the basic-state absolute vorticity gradient ? ? Un0(y) is zero, ultimately become inconsistent in the neighborhood ...

G. Brunet; P. H. Haynes

1995-02-01T23:59:59.000Z

362

Compound parabolic concentrator with cavity for tubular absorbers  

DOE Patents (OSTI)

A compond parabolic concentrator with a V-shaped cavity is provided in which an optical receiver is emplaced. The cavity redirects all energy entering between the receiver and the cavity structure onto the receiver, if the optical receiver is emplaced a distance from the cavity not greater than 0.27 r (where r is the radius of the receiver).

Winston, Roland (5217C S. University Ave., Chicago, IL 60615)

1983-01-01T23:59:59.000Z

363

Secondary concentrators for parabolic dish solar thermal power systems  

SciTech Connect

One approach to production of electricity or high-temperature process heat from solar energy is to use point-focusing, two-axis pointing concentrators in a distributed-receiver solar thermal system. This paper discusses some of the possibilities and problems in using compound concentrators in parabolic dish systems. 18 refs.

Jaffe, L.D.; Poon, P.T.

1981-01-01T23:59:59.000Z

364

Electromagnetic Casimir Forces of Parabolic Cylinder and Knife-Edge Geometries  

E-Print Network (OSTI)

An exact calculation of electromagnetic scattering from a perfectly conducting parabolic cylinder is employed to compute Casimir forces in several configurations. These include interactions between a parabolic cylinder and a plane, two parabolic cylinders, and a parabolic cylinder and an ordinary cylinder. To elucidate the effect of boundaries, special attention is focused on the "knife-edge" limit in which the parabolic cylinder becomes a half-plane. Geometrical effects are illustrated by considering arbitrary rotations of a parabolic cylinder around its focal axis, and arbitrary translations perpendicular to this axis. A quite different geometrical arrangement is explored for the case of an ordinary cylinder placed in the interior of a parabolic cylinder. All of these results extend simply to nonzero temperatures.

Noah Graham; Alexander Shpunt; Thorsten Emig; Sahand Jamal Rahi; Robert L. Jaffe; Mehran Kardar

2011-03-30T23:59:59.000Z

365

Electromagnetic Casimir forces of parabolic cylinder and knife-edge geometries  

SciTech Connect

An exact calculation of electromagnetic scattering from a perfectly conducting parabolic cylinder is employed to compute Casimir forces in several configurations. These include interactions between a parabolic cylinder and a plane, two parabolic cylinders, and a parabolic cylinder and an ordinary cylinder. To elucidate the effect of boundaries, special attention is focused on the 'knife-edge' limit in which the parabolic cylinder becomes a half-plane. Geometrical effects are illustrated by considering arbitrary rotations of a parabolic cylinder around its focal axis, and arbitrary translations perpendicular to this axis. A quite different geometrical arrangement is explored for the case of an ordinary cylinder placed in the interior of a parabolic cylinder. All of these results extend simply to nonzero temperatures.

Graham, Noah [Department of Physics, Middlebury College, Middlebury, Vermont 05753 (United States); Shpunt, Alexander; Kardar, Mehran [Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Emig, Thorsten [Laboratoire de Physique Theorique et Modeles Statistiques, CNRS UMR 8626, Bat. 100, Universite Paris-Sud, 91405 Orsay cedex (France); Rahi, Sahand Jamal [Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Center for Studies in Physics and Biology, The Rockefeller University, 1230 York Street, New York, New York 10065 (United States); Jaffe, Robert L. [Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Center for Theoretical Physics and Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2011-06-15T23:59:59.000Z

366

Deep-Sea Research I 51 (2004) 17691780 Sedimentation in the Southern Okinawa Trough: enhanced  

E-Print Network (OSTI)

Deep-Sea Research I 51 (2004) 1769­1780 Sedimentation in the Southern Okinawa Trough: enhanced and hydrodynamic conditions, the southernmost part of the Southern Okinawa Trough (SOT) acts like an efficient to differentiate the subsurface peak of 239, 240 Pu resulting from the global fallout maximum in AD 1963

Huh, Chih-An

367

Inverted Troughs and Cyclogenesis over Interior North America: A Limited Regional Climatology and Case Studies  

Science Conference Proceedings (OSTI)

A limited regional climatology of cyclones with and without inverted troughs that form in the Colorado region is presented along with case study results from two major cyclone events in which an inverted trough plays a prominent role in the life ...

Len G. Keshishian; Lance F. Bosart; W. Edward Bracken

1994-04-01T23:59:59.000Z

368

What Percentage of Western North Pacific Tropical Cyclones Form within the Monsoon Trough?  

Science Conference Proceedings (OSTI)

It is frequently stated that 70%–80% of western North Pacific tropical cyclones form “within the monsoon trough,” but without an objective definition of the term. Several definitions are tested here. When the monsoon trough (MT) is defined as the ...

John Molinari; David Vollaro

2013-02-01T23:59:59.000Z

369

Simulation of Boundary Layer Structure over the Indian Summer Monsoon Trough during the Passage of a Depression  

Science Conference Proceedings (OSTI)

The planetary boundary layer (PBL) structure over the Indian summer monsoon trough region has been simulated using a regional numerical model during the passage of a monsoon depression along the monsoon trough. Monin–Obukhov similarity theory for ...

K. V. J. Potty; U. C. Mohanty; S. Raman

2001-07-01T23:59:59.000Z

370

Development and testing of Parabolic Dish Concentrator No. 1  

DOE Green Energy (OSTI)

Parabolic Dish Concentrator No. 1 (PDC-1) is a 12-m-diameter prototype concentrator that evolved from a six-year effort to produce a unit with low life-cycle costs for use with thermal-to-electric energy conversion devices. The concentrator assembly features panels made of a resin transfer molded balsa core/fiberglass sandwich with plastic reflective film as the reflective surface and a ribbed framework to hold the panels in place. The concentrator assembly tracks in azimuth and elevation on a base frame riding on a circular track. In 1982, PDC-1 was installed at the Jet Propulsion Laboratory's Parabolic Dish Test Site at Edwards Air Force Base, California. Initial optical testing showed that the panels did not exhibit the proper parabolic contour. After reassembly to correct this problem, further optical testing discovered thermal gradients in the panels with daily temperature changes. In spite of this, PDC-1 has sufficient optical quality to operate satisfactorily in a dish-electric system. With suggested improvements, its performance could be increased. The PDC-1 development effort provided the impetus for creating innovative optical testing methods and also provided valuable information for use in designing and fabricating concentrators of future dish-electric systems.

Dennison, E.W.; Thostesen, T.O.

1984-12-15T23:59:59.000Z

371

Irrigation market for solar-thermal parabolic-dish systems  

Science Conference Proceedings (OSTI)

The potential size of the onfarm-pumped irrigation market for solar thermal parabolic dish systems in seven high-insolation states is estimated. The study is restricted to the displacement of three specific fuels: gasoline, diesel and natural gas. A model was developed to estimate the optimal number of parabolic dish modules per farm based on the minimum cost mix of conventional and solar thermal energy required to meet irrigation needs. Results indicate that the near-term market for such systems depends not only on the type of crop and method of irrigation, but also on the optimal utilization of each added module, which in turn depends on the price of conventional fuel, real discount rate, marginal cost of the solar thermal power system, local insolation level and parabolic dish system efficiency. The study concludes that the potential market size for onfarm-pumped irrigation applications ranges from 101,000 modules when a 14% real discount rate is assumed to 220,000 modules when the real discount rate drops to 8%. Arizona, Kansas, Nebraska, New Mexico and Texas account for 98% of the total demand for this application, with the natural gas replacement market accounting for the largest segment (71%) of the total market.

Habib-agahi, H.; Jones, S.C.

1981-09-01T23:59:59.000Z

372

On the use of the parabolic concentration profile assumption for a rotary desiccant dehumidifier  

SciTech Connect

The current work describes a model for a desiccant dehumidifier which uses a parabolic concentration profile assumption to model the diffusion resistance inside the desiccant particle. The relative merits of the parabolic concentration profile model compared with widely utilized rotary desiccant wheel models are discussed. The periodic steady-state parabolic concentration profile model developed is efficient and can accommodate a variety of materials. These features make it an excellent tool for design studies requiring repetitive desiccant wheel simulations. A quartic concentration profile assumption was also investigated which yielded a 2.8 percent average improvement in prediction error over the parabolic model.

Chant, E.E. [Univ. of Turabo, Gurabo (Puerto Rico); Jeter, S.M. [Georgia Inst. of Technology, Atlanta, GA (United States). George W. Woodruff School of Mechanical Engineering

1995-02-01T23:59:59.000Z

373

Deformation of a thin, elastic plate to a deep parabolic cylinder  

DOE Green Energy (OSTI)

Equations governing the elastic deformation of thin plates through large displacements to deep parabolic cylinders are presented and solved. The solution consists of expressions for a spatially distributed surface pressure and uniform rim loads which, when applied to the plate, produce the specified, deep parabolic cylindrical shape. These forming loads are written in dimensionless form for parabolic cylinders of arbitrary focal length and arbitrary rim to rim aperture. Numerical results are presented and limiting values are discussed. The solution and results find immediate application to mechanical forming and adhesive retention of parabolic solar collector components.

Reuter, R.C. Jr.; Wilson, R.K.

1982-02-01T23:59:59.000Z

374

Load on Trough Bellows Following an Argon Spill  

SciTech Connect

In the case of a gross argon spill from the DO detector, the liquid argon is caught in three plenums. These plenums are to be connected by bellows to make a horizontal trough open at one end for removing the argon. The design of these bellows is dependent on the maximum argon load they must carry. Bellows to connect the three argon-catching plenums in the DO detector must be able to carry at least 92 lbs of argon when closed and 231 lbs when open, plus the load due to argon in the convolutions. Examples of such loads and the method for their calculations are contained in the Discussion. It should be noted that a set of assumptions was used in these calculations. First, we considered a uniform channel and uniform flow. Second, we used a value for Manning's n meant for a similar, but not exactly the same, case. Finally, we were forced to define an average depth, d, to be used to state the hydraulic radius, R, and area of flow, A. These facts may warrant consideration in future calculations.

Chess, K.; /Fermilab

1988-07-12T23:59:59.000Z

375

Inhomogeneous parabolic equations on unbounded metric measure spaces  

E-Print Network (OSTI)

We study inhomogeneous semilinear parabolic equations with source term f independent of time u_{t}={\\Delta}u+u^{p}+f(x) on a metric measure space, subject to the conditions that f(x)\\geq 0 and u(0,x)=\\phi(x)\\geq 0. By establishing Harnack-type inequalities in time t and some powerful estimates, we give sufficient conditions for non-existence, local existence, and global existence of weak solutions. This paper generalizes previous results on Euclidean spaces to general metric measure spaces.

Kenneth J. Falconer; Jiaxin Hu; Yuhua Sun

2011-03-29T23:59:59.000Z

376

Piecewise Tendency Diagnosis of Dynamical Processes Governing the Development of an Upper-Tropospheric Mobile Trough  

Science Conference Proceedings (OSTI)

The intensification and evolution of midlatitude upper-tropospheric mobile troughs may be viewed in terms of the isentropic advection and deformation of the tropopause potential vorticity gradient. The potential vorticity viewpoint allows one to ...

John W. Nielsen-Gammon; Randy J. Lefevre

1996-11-01T23:59:59.000Z

377

The Structure and Evolution of a Simulated Rocky Mountain Lee Trough  

Science Conference Proceedings (OSTI)

This paper describes the life cycle of a lee trough associated with the passage of a baroclinic wave over the Rocky Mountains based on two overlapping simulations by the Pennsylvania State University-National Center for Atmospheric Research ...

W. James Steenburgh; Clifford F. Mass

1994-12-01T23:59:59.000Z

378

Satellite Observations of Variations in Tropical Cyclone Convection Caused by Upper-Tropospheric Troughs  

Science Conference Proceedings (OSTI)

The mutual adjustment between upper-tropospheric troughs and the structure of western Atlantic Tropical Cyclones Florence (1988) and Irene (1981) are analyzed using satellite and in situ data. Satellite-observed tracers (e.g., cirrus clouds, ...

Edward B. Rodgers; Simon W. Chang; John Stout; Joseph Steranka; Jainn-Jong Shi

1991-08-01T23:59:59.000Z

379

Real-Time Forecasting of the Western Australian Summertime Trough: Evaluation of a New Regional Model  

Science Conference Proceedings (OSTI)

The real-time prediction of the location, strength, and structure of the summertime heat trough is a major forecasting problem over Western Australia. Maximum temperatures, wind strength and direction along the west coast, low-level coastal cloud,...

Lance M. Leslie; Terry C. L. Skinner

1994-09-01T23:59:59.000Z

380

A Composite Study of the Interactions between Tropical Cyclones and Upper-Tropospheric Troughs  

Science Conference Proceedings (OSTI)

The objective of this study is to understand how interactions with upper-tropospheric troughs affect the intensity of tropical cyclones. The study includes all named Atlantic tropical cyclones between 1985 and 1996. To minimize other factors ...

Deborah Hanley; John Molinari; Daniel Keyser

2001-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

The temperature field around a spherical ridge or trough in a plane  

SciTech Connect

An analytical solution, which describes the temperature field around a single spherical particle partly embedded in a plane or around a trough making an arbitrary contact angle with a plane, is presented here. The temperature distributions for three cases are studied: the temperature distribution around a conducting bowl or trough, the temperature distribution around a non-conducting bowl or trough present in a conducting plane, and the temperature profile around a conducting bowl or trough conducting heat toward a sink at infinity. The normalized heat flux distribution on the plane and particle is presented. The various incremental resistances caused by a single and a dilute planar random array of truncated spherical particles are also derived.

Fransaer, J.; Roos, J.R. (Katholieke Univ. Leuven, Heverlee (Belgium))

1992-05-01T23:59:59.000Z

382

Moist Dynamical Linkage between the Equatorial Indian Ocean and the South Asian Monsoon Trough  

Science Conference Proceedings (OSTI)

During boreal summer, both the monsoon trough and the equatorial Indian Ocean (EIO) receive intense climatological precipitation. At various time scales, EIO sea surface temperature (SST) and/or precipitation variations interact with rainfall ...

H. Annamalai

2010-03-01T23:59:59.000Z

383

Numerical Prediction of the Summertime Ridge–Trough System over Northeastern Australia  

Science Conference Proceedings (OSTI)

The synoptic pattern over northeastern Australia is dominated in the warmer months by a ridge–trough system. Accurate prediction of the location of the system is a significant forecasting problem for regional and global operational models. The ...

Terence C. L. Skinner; Lance M. Leslie

1999-06-01T23:59:59.000Z

384

Changes in the Economic Value of Variable Generation at High Penetration Levels: A Pilot Case Study of California  

E-Print Network (OSTI)

molten salt storage for parabolic trough solar power plants.Future Costs for Parabolic Trough and Power Tower Systems inoften based on solar trough or parabolic dish technology) to

Mills, Andrew

2013-01-01T23:59:59.000Z

385

Distributed Energy Systems in California's Future: A Preliminary Report Volume 2  

E-Print Network (OSTI)

Cooling (.31) Parabolic trough (70%) Thermal Storage (80%)Electricity (.ll) Parabolic trough (70%) Turbin"e (Rankine1.8kWh/m Collector (parabolic tracking trough) . T Absorpt~

Balderston, F.

2010-01-01T23:59:59.000Z

386

Concentrating Solar Power Commercial Application Study  

E-Print Network (OSTI)

Concentrating Solar Power Technologies............................................... 7 Parabolic Troughs power technologies are described in this report: parabolic troughs, linear Fresnel, power towers, and dish/engine. Parabolic troughs are the most commercially available technology. Linear Fresnel and power

Laughlin, Robert B.

387

ATMOSPHERIC AND OCEANIC SCIENCE LETTERS, 2010, VOL. 3, NO. 1, 1-6 Identifying Global Monsoon Troughs and Global Atmospheric Centers of  

E-Print Network (OSTI)

ATMOSPHERIC AND OCEANIC SCIENCE LETTERS, 2010, VOL. 3, NO. 1, 1-6 Identifying Global Monsoon identified global monsoon troughs and global atmospheric centers of action (ACAs) on a pentad scale. The global monsoon troughs consist of planetary-scale monsoon troughs and peninsula-scale monsoon troughs

Qian, Weihong

388

Theory of Parabolic Arcs in Interstellar Scintillation Spectra  

E-Print Network (OSTI)

Our theory relates the secondary spectrum, the 2D power spectrum of the radio dynamic spectrum, to the scattered pulsar image in a thin scattering screen geometry. Recently discovered parabolic arcs in secondary spectra are generic features for media that scatter radiation at angles much larger than the rms scattering angle. Each point in the secondary spectrum maps particular values of differential arrival-time delay and fringe rate (or differential Doppler frequency) between pairs of components in the scattered image. Arcs correspond to a parabolic relation between these quantities through their common dependence on the angle of arrival of scattered components. Arcs appear even without consideration of the dispersive nature of the plasma. Arcs are more prominent in media with negligible inner scale and with shallow wavenumber spectra, such as the Kolmogorov spectrum, and when the scattered image is elongated along the velocity direction. The arc phenomenon can be used, therefore, to constrain the inner scale and the anisotropy of scattering irregularities for directions to nearby pulsars. Arcs are truncated by finite source size and thus provide sub micro arc sec resolution for probing emission regions in pulsars and compact active galactic nuclei. Multiple arcs sometimes seen signify two or more discrete scattering screens along the propagation path, and small arclets oriented oppositely to the main arc persisting for long durations indicate the occurrence of long-term multiple images from the scattering screen.

James M. Cordes; Barney J. Rickett; Daniel R. Stinebring; William A. Coles

2004-07-03T23:59:59.000Z

389

The Piecewise Parabolic Method for Multidimensional Relativistic Fluid Dynamics  

E-Print Network (OSTI)

We present an extension of the Piecewise Parabolic Method to special relativistic fluid dynamics in multidimensions. The scheme is conservative, dimensionally unsplit, and suitable for a general equation of state. Temporal evolution is second-order accurate and employs characteristic projection operators; spatial interpolation is piece-wise parabolic making the scheme third-order accurate in smooth regions of the flow away from discontinuities. The algorithm is written for a general system of orthogonal curvilinear coordinates and can be used for computations in non-cartesian geometries. A non-linear iterative Riemann solver based on the two-shock approximation is used in flux calculation. In this approximation, an initial discontinuity decays into a set of discontinuous waves only implying that, in particular, rarefaction waves are treated as flow discontinuities. We also present a new and simple equation of state which approximates the exact result for the relativistic perfect gas with high accuracy. The strength of the new method is demonstrated in a series of numerical tests and more complex simulations in one, two and three dimensions.

A. Mignone; T. Plewa; G. Bodo

2005-05-10T23:59:59.000Z

390

The solvability of the first initial-boundary problem for parabolic and degenerate parabolic equations in domains with a conical point  

SciTech Connect

The first initial-boundary problem for second-order parabolic and degenerate parabolic equations is investigated in a domain with a conical or angular point. The means of attack is already known and uses weighted classes of smooth or integrable functions. Sufficient conditions for a unique solution to exist and for coercive estimates for the solution to be obtained are formulated in terms of the angular measure of the solid angle and the exponent of the weight. It is also shown that if these conditions fail to hold, then the parabolic problem has elliptic properties, that is, it can have a nonzero kernel or can be nonsolvable, and, in the latter case, it is not even a Fredholm problem. A parabolic equation and an equation with some degeneracy or a singularity at a conical point are considered. Bibliography: 49 titles.

Degtyarev, Sergey P [Institute of Applied Mathematics and Mechanics, Ukraine National Academy of Sciences, Donetsk (Ukraine)

2010-09-02T23:59:59.000Z

391

BETTI NUMBERS OF PARABOLIC U(2, 1)-HIGGS BUNDLES MODULI SPACES.  

E-Print Network (OSTI)

Abstract. Let X be a compact Riemann surface together with a finite set of marked points. We use Morse theoretic techniques to compute the Betti numbers of the parabolic U(2, 1)-Higgs bundles moduli spaces over X. We give examples for one marked point showing that the Poincaré polynomials depend on the system of weights of the parabolic bundle. 1.

Marina Logares

2006-01-01T23:59:59.000Z

392

A Parallel Scheme of the Split-Step Fourier Transform Method for Solving Parabolic Wave Equation  

Science Conference Proceedings (OSTI)

The split-step Fourier transform method for solving the parabolic wave equation is briefly introduced in this paper. To achieve the acceleration of the calculation process, a parallel scheme based on matrix transpose is proposed. Due to some ingenious ... Keywords: Parabolic Wave Equation, Split-Step Fourier Transform Method, Parallel Computing

Liu Shuai; Li Zhi

2012-10-01T23:59:59.000Z

393

New high-flux two-stage optical designs for parabolic solar concentrators  

SciTech Connect

We present a new two-stage optical design for parabolic dish concentrators that can realistically attain close to 90% of the thermodynamic limit to concentration with practical, compact designs (e.g., at parabola rim half-angles of around 45[degrees]). For comparison, the parabolic dish-plus-compound parabolic concentrator secondary design, at this rim angle, achieves no more than 50% of the thermodynamic limit. Our new secondary concentrator is tailored to accept edge rays from the parabolic primary, and incurs less than one reflection on average. It necessitates displacing the absorber from the parabola's focal plane, along the concentrator's optic axis, toward the primary reflector, and constructing the secondary between the absorber and the primary. The secondary tailored edge-ray concentrators described here create new possibilities for building compact, extremely high flux solar furnaces and/or commercial parabolic dish systems.

Friedman, R.P.; Gordon, J.M. (Ben-Gurion Univ. of the Negev, Sede Boqer (Israel) Ben-Gurion Univ. of the Negev, Beersheva (Israel)); Ries, H. (Weizmann Institute of Science, Rehovot (Israel))

1993-11-01T23:59:59.000Z

394

Development and demonstration of compound parabolic concentrators for solar thermal power generation and heating and cooling applications. Progress report, July--December 1975  

DOE Green Energy (OSTI)

Work on the development of Compound Parabolic Concentrators (CPC) is described. A tenfold concentrator with a cavity receiver was constructed and tested. The optical efficiency was very good (65 percent), but the thermal performance was degraded by heat losses of the cavity receiver. A 20 ft/sup 2/ (1.86 m/sup 2/) concentrating collector (5.3x) has been tested for thermal and optical performance, and the optical efficiency was excellent (68 percent). In this collector, aluminum extrusions were used to define the CPC shape and provide the fluid-flow path. A 30 ft (9.14 m) long collector (10x) has been designed and is being built for daily-cycle testing. The expected performance of this collector has been evaluated. The conceptual design of a lightweight collector using evacuated glass tubes around the absorber is presented. Various construction techniques for use with low-cost materials, such as plastics, are being evaluated for this collector. Optical design studies of Compound Parabolic Concentrators for tubular absorbers and for use as secondary concentrators are discussed. Comparison of the CPC with tube and the CPC with one-sided flat absorber shows that the tubular configuration is preferable not only because of lower heat losses but also because of lower collector cost. For tracking concentrators with line focus, the use of second-stage concentrators is found to be cost effective; the CPC is found to be significantly better for this application than a V-trough. A summary of the results of subcontracts described in the previous progress report are presented, and the influence of these results on ANL programs is noted.

Allen, J.W.; Levitz, N.M.; Rabl, A.; Reed, K.A.; Schertz, W.W.; Thodos, G.; Winston, R.

1977-01-01T23:59:59.000Z

395

Characteristics of quadratic electro-optic effects and electro-absorption process in CdSe parabolic quantum dots  

Science Conference Proceedings (OSTI)

The nonlinear susceptibilities have been calculated theoretically for CdSe disk-like parabolic quantum dots by using a two-energy-level model in the strong-confinement regime. The confined wave functions and eigenenergies of excitons in parabolic quantum ... Keywords: Electro-optical effects, Excitons, Parabolic quantum dot

Shufei Xie; Guiguang Xiong; Xiaobo Feng; Zhihong Chen

2007-06-01T23:59:59.000Z

396

Domain Decomposition via Explicit/Implicit Time Marching 1 Polynomial Collocation Using a Domain Decomposition Solution to Parabolic  

E-Print Network (OSTI)

Decomposition Solution to Parabolic PDE's via the Penalty Method and Explicit/Implicit Time Marching Kelly Black 1 Abstract A domain decomposition method is examined to solve a time dependent parabolic equation05. (1) Introduction We examine a domain decomposition method for solving a parabolic equation using

397

Spectral inequalities for non-selfadjoint elliptic operators and application to the null-controllability of parabolic systems  

E-Print Network (OSTI)

-controllability of parabolic systems Matthieu L´eautaud November, 2009 Abstract We consider elliptic operators A on a bounded the construction of a control for the non-selfadjoint parabolic problem tu + Au = Bg. In particular, the L2 norm are provided for systems of weakly coupled parabolic equations and for the measurement of the level sets

Paris-Sud XI, Université de

398

Parabolic focal conics and polygonal textures in lipid liquid crystals (*) S. A. Asher and P. S. Pershan  

E-Print Network (OSTI)

161 Parabolic focal conics and polygonal textures in lipid liquid crystals (*) S. A. Asher and P. S crystals. The parabolic focal conic model proposed by Rosenblatt, Pindak, Clark and Meyer for the polygonal as the strains inducing them are increased. The parabolic focal conic model does not completely describe

Asher, Sanford A.

399

The symmetric parabolic resonance This article has been downloaded from IOPscience. Please scroll down to see the full text article.  

E-Print Network (OSTI)

The symmetric parabolic resonance This article has been downloaded from IOPscience. Please scroll Nonlinearity 23 (2010) 1325­1351 doi:10.1088/0951-7715/23/6/005 The symmetric parabolic resonance V Rom-Kedar1 Treschev Abstract The parabolic resonance instability emerges in diverse applications ranging from optical

400

IEEE TRANSACTIONS ON AUTOMATIC CONTROL, VOL. 53, NO. 7, AUGUST 2008 1575 Adaptive Boundary Control for Unstable Parabolic  

E-Print Network (OSTI)

for Unstable Parabolic PDEs--Part I: Lyapunov Design Miroslav Krstic, Fellow, IEEE, and Andrey Smyshlyaev, Member, IEEE Abstract--We develop adaptive controllers for parabolic par- tial differential equations for parabolic PDEs con- trolled from a boundary and containing unknown destabilizing parameters affecting

Krstic, Miroslav

Note: This page contains sample records for the topic "baseload parabolic trough" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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401

IEEE JOURNAL OF OCEANIC ENGINEERING, VOL. 34, NO. 4, OCTOBER 2009 617 Extension of the Rotated Elastic Parabolic Equation  

E-Print Network (OSTI)

Elastic Parabolic Equation to Beach and Island Propagation Jon M. Collis, William L. Siegmann, Senior sloping interfaces and boundaries with the parabolic equation method have been an active area of research transformation techniques. The variable-rotated parabolic equation is among recent advances in this area

402

Near-field enhancement of metal nano-particle based on the light focusing by the micro-parabolic mirror  

E-Print Network (OSTI)

Near-field enhancement of metal nano-particle based on the light focusing by the micro-parabolic mirror , , , , Abstract We propose to use a micro-parabolic mirror, in order to improve the near- parabolic mirror, the mirror-reflected light can be efficiently transformed into the near-field of the nano

Park, Namkyoo

403

Water and Energy Interactions  

E-Print Network (OSTI)

technology is the parabolic trough. For the past 15 years,system is used for a parabolic trough, roughly 80 gallons of

McMahon, James E.

2013-01-01T23:59:59.000Z

404

October 2012 Approved Resource Management Plan  

E-Print Network (OSTI)

(clockwise from upper left): Solar Parabolic Trough (Source: Hosoya et al. 2008), Solar Power Tower). Reference citations are available in Chapter 1. Background photo: Parabolic trough facility from

Argonne National Laboratory

405

Use of compound parabolic concentrator for solar energy collection  

DOE Green Energy (OSTI)

The joint team of Argonne National Laboratory (ANL) and the University of Chicago is reporting their midyear results of a proof-of-concept investigation of the Compound Parabolic Concentrator (CPC) for solar-energy collection. The CPC is a non-imaging, optical-design concept for maximally concentrating radiant energy onto a receiver. This maximum concentration corresponds to a relative aperture (f/number) of 0.5, which is well beyond the limit for imaging collectors. We have constructed an X3 concentrating flat-plate collector 16 ft/sup 2/ in area. This collector has been tested in a trailer laboratory facility built at ANL. The optical and thermal performance of this collector was in good agreement with theory. We have constructed an X10 collector (8 ft/sup 2/) and started testing. A detailed theoretical study of the optical and thermal characteristics of the CPC design has been performed.

Rabi, A.; Sevcik, V.J.; Giugler, R.M.; Winston, R.

1974-01-01T23:59:59.000Z

406

Fifth parabolic dish solar thermal power program annual review: proceedings  

DOE Green Energy (OSTI)

The primary objective of the Review was to present the results of activities within the Parabolic Dish Technology and Module/Systems Development element of the Department of Energy's Solar Thermal Energy Systems Program. The Review consisted of nine technical sessions covering overall Project and Program aspects, Stirling and Brayton module development, concentrator and engine/receiver development, and associated hardware and test results to date; distributed systems operating experience; international dish development activities; and non-DOE-sponsored domestic dish activities. A panel discussion concerning business views of solar electric generation was held. These Proceedings contain the texts of presentations made at the Review, as submitted by their authors at the beginning of the Review; therefore, they may vary slightly from the actual presentations in the technical sessions.

None

1984-03-01T23:59:59.000Z

407

Overview of software development at the Parabolic Dish Test Site  

DOE Green Energy (OSTI)

The development history of the data acquisition and data analysis software is discussed in this report. The software development occurred between 1978 and 1984 in support of solar energy module testing at the Jet Propulsion Laboratory's Parabolic Dish Test Site, located within Edwards Test Station. The development went through incremental stages, starting with a simple single-user BASIC set of programs, and progressing to the relative complex multi-user FORTRAN system that was used until the termination of the project. Additional software in support of testing is discussed including software in support of the meteorological subsystem and the Test Bed Concentrator Control Console interface. Conclusions and recommendations for further development are discussed.

Miyazono, C.K.

1985-07-15T23:59:59.000Z

408

Optimal Control of a Parabolic Equation with Dynamic Boundary Condition  

SciTech Connect

We investigate a control problem for the heat equation. The goal is to find an optimal heat transfer coefficient in the dynamic boundary condition such that a desired temperature distribution at the boundary is adhered. To this end we consider a function space setting in which the heat flux across the boundary is forced to be an L{sup p} function with respect to the surface measure, which in turn implies higher regularity for the time derivative of temperature. We show that the corresponding elliptic operator generates a strongly continuous semigroup of contractions and apply the concept of maximal parabolic regularity. This allows to show the existence of an optimal control and the derivation of necessary and sufficient optimality conditions.

Hoemberg, D., E-mail: hoemberg@wias-berlin.de; Krumbiegel, K., E-mail: krumbieg@wias-berlin.de [Weierstrass Institute for Applied Mathematics and Stochastics, Nonlinear Optimization and Inverse Problems (Germany); Rehberg, J., E-mail: rehberg@wias-berlin.de [Weierstrass Institute for Applied Mathematics and Stochastics, Partial Differential Equations (Germany)

2013-02-15T23:59:59.000Z

409

Thermal design of compound parabolic concentrating solar-energy collectors  

SciTech Connect

A theoretical analysis of the heat exchanges in a Compound Parabolic Concentrator solar energy collector is presented. The absorber configuration considered is that of a tube (with or without a spectrally-selective surface) either directly exposed or enclosed within one or two glass envelopes. The annular cavity formed between the tube and the surrounding envelope can be either air-filled or evacuated. The optimal annular gap, which leads to the best overall collector efficiency, has been predicted for the nonevacuated arrangement. It was found to be approximately 5 mm for the considered geometry. The evacuation of the annular cavity or the application of a selective surface, separately employed, are demonstrated to yield improvements of the same order.

Prapas, D.E.; Norton, B.; Probert, S.D.

1987-05-01T23:59:59.000Z

410

Solar Trough Organic Rankine Electricity System (STORES) Stage 1: Power Plant Optimization and Economics; November 2000 -- May 2005  

DOE Green Energy (OSTI)

Report regarding a Stage 1 Study to further develop the concept of the Solar Trough Organic Rankine Cycle Electricity Systems (STORES).

Prabhu, E.

2006-03-01T23:59:59.000Z

411

SHADE: a computer model for evaluating the optical performance of two-axis tracking parabolic concentrators  

DOE Green Energy (OSTI)

A computer model SHADE (Selection of Heliostat Arrangement for Distributed Engines) has been developed at the Pacific Northwest Laboratory to aid in determining the optical performance of two-axis tracking parabolic concentrators. The shading of individual mirror assemblies in a field of parabolic dishes determines the optimal field arrangement and the most efficient method of plant operation. SHADE provides a simple and inexpensive analytical tool for examining certain design aspects of solar thermal power systems using a network of point-focusing parabolic concentrators.

Apley, W. J.

1979-05-01T23:59:59.000Z

412

Peaks and Troughs in Helioseismology: The Power Spectrum of Solar Oscillations  

E-Print Network (OSTI)

I present a matched-wave asymptotic analysis of the driving of solar oscillations by a general localised source. The analysis provides a simple mathematical description of the asymmetric peaks in the power spectrum in terms of the relative locations of eigenmodes and troughs in the spectral response. It is suggested that the difference in measured phase function between the modes and the troughs in the spectrum will provide a key diagnostic of the source of the oscillations. I also suggest a form for the asymmetric line profiles to be used in the fitting of solar power spectra. Finally I present a comparison between the numerical and asymptotic descriptions of the oscillations. The numerical results bear out the qualitative features suggested by the asymptotic analysis but suggest that numerical calculations of the locations of the troughs will be necessary for a quantitative comparison with the observations.

Colin S. Rosenthal

1998-04-03T23:59:59.000Z

413

arXiv:math/0302209v1[math.AG]18Feb2003 THETA FUNCTIONS ON THE MODULI SPACE OF PARABOLIC  

E-Print Network (OSTI)

arXiv:math/0302209v1[math.AG]18Feb2003 THETA FUNCTIONS ON THE MODULI SPACE OF PARABOLIC BUNDLES parabolic vector bundles of rank r, trivial determinant and fixed parabolic structure at I better bound, in the sense that it does not depend on the genus g of the curve [Po]. The parabolic case

Sorger, Christoph

414

The parabolic Sturmian-function basis representation of the six-dimensional Coulomb Green's function  

E-Print Network (OSTI)

The square integrable basis set representation of the resolvent of the asymptotic three-body Coulomb wave operator in parabolic coordinates is obtained. The resulting six-dimensional Green's function matrix is expressed as a convolution integral over separation constants.

S. A. Zaytsev

2008-06-03T23:59:59.000Z

415

Classification of Invariant Differential Operators for Non-Compact Lie Algebras via Parabolic Relations  

E-Print Network (OSTI)

In the present paper we review the progress of the project of classification and construction of invariant differential operators for non-compact semisimple Lie groups. Our starting points is the class of algebras, which we called earlier 'conformal Lie algebras' (CLA), which have very similar properties to the conformal algebras of Minkowski space-time, though our aim is to go beyond this class in a natural way. For this we introduced recently the new notion of {\\it parabolic relation} between two non-compact semisimple Lie algebras $\\cal G$ and $\\cal G'$ that have the same complexification and possess maximal parabolic subalgebras with the same complexification. Thus, we consider the exceptional algebra $E_{7(7)}$ which is parabolically related to the CLA $E_{7(-25)}$. Other interesting examples are the orthogonal algebras $so(p,q)$ all of which are parabolically related to the conformal algebra $so(n,2)$ with $p+q=n+2$, the parabolic subalgebras including the Lorentz subalgebra $so(n-1,1)$ and its analogs $so(p-1,q-1)$. Further we consider the algebras $sl(2n,R)$ and for $n=2k$ the algebras $su^*(4k)$ which are parabolically related to the CLA $su(n,n)$. Further we consider the algebras $sp(r,r)$ which are parabolically related to the CLA $sp(2r,R)$. We consider also $E_{6(6)}$ and $E_{6(2)}$ which are parabolically related to the hermitian symmetric case $E_{6(-14)}$.

V. K. Dobrev

2013-11-29T23:59:59.000Z

416

Stability in terms of two measures for a class of semilinear impulsive parabolic equations  

SciTech Connect

The problem of stability in terms of two measures is considered for semilinear impulsive parabolic equations. A new version of the comparison method is proposed, and sufficient conditions for stability in terms of two measures are obtained on this basis. An example of a hybrid impulsive system formed by a system of ordinary differential equations coupled with a partial differential equation of parabolic type is given. The efficiency of the described approaches is demonstrated. Bibliography: 24 titles.

Dvirnyj, Aleksandr I; Slyn'ko, Vitalij I

2013-04-30T23:59:59.000Z

417

Comparison of Fresnel lenses and parabolic mirrors as solar energy concentrators  

SciTech Connect

This paper compares the gain that can be achieved with a one- or two-stage concentrator, when the first stage is a Fresnel lens or a parabolic mirror, as a function of the luminosity of the concentrator. The results show that the achievable gain using a parabolic mirror is greater than that obtained using a flat or roof lens but is lower than that obtained using a curved lens.

Lorenzo, E.; Luque, A.

1982-05-15T23:59:59.000Z

418

Conservation Laws and Potential Symmetries of Linear Parabolic Equations  

E-Print Network (OSTI)

We carry out an extensive investigation of conservation laws and potential symmetries for the class of linear (1+1)-dimensional second-order parabolic equations. The group classification of this class is revised by employing admissible transformations, the notion of normalized classes of differential equations and the adjoint variational principle. All possible potential conservation laws are described completely. They are in fact exhausted by local conservation laws. For any equation from the above class the characteristic space of local conservation laws is isomorphic to the solution set of the adjoint equation. Effective criteria for the existence of potential symmetries are proposed. Their proofs involve a rather intricate interplay between different representations of potential systems, the notion of a potential equation associated with a tuple of characteristics, prolongation of the equivalence group to the whole potential frame and application of multiple dual Darboux transformations. Based on the tools developed, a preliminary analysis of generalized potential symmetries is carried out and then applied to substantiate our construction of potential systems. The simplest potential symmetries of the linear heat equation, which are associated with single conservation laws, are classified with respect to its point symmetry group. Equations possessing infinite series of potential symmetry algebras are studied in detail.

Roman O. Popovych; Michael Kunzinger; Nataliya M. Ivanova

2007-06-04T23:59:59.000Z

419

Experimental natural convective studies within a compound parabolic concentrator enclosure  

SciTech Connect

The contribution due to natural convection within a compound parabolic concentrator enclosure has been experimentally determined. These studies have been conducted within a 4X-CPC collector, having a receiver width of 3.175 cm (1.25 inches) and 2.44 m (96 inches) in length. The receiver was heated electrically while the aperture was provided with a duct that was cooled by water. The limbs of the collector were fabricated from aluminum. Temperatures were directly obtained with copper-constantan thermocouples located throughout the entire enclosure and provided the basis needed to calculate the different modes of heat transfer. The constant heat flux at the receiver translated to a nearly isothermal state. The rates of natural convection have been expressed in terms of a Nu-Ra correlation where 1.0x10/sup 7/ < Ra < 4.0x10/sup 7/. To suppress natural convection, a horizontal partition was introduced at different heights between the receiver and aperture. These results have been expressed as heat fluxes and temperature differences between the receiver and the aperture. This information made possible a comparison between the aperture-partition enclosure and a flat plate geometry.

Tatara, R.A.; Thodos, G.

1983-01-01T23:59:59.000Z

420

Two dimensional compound parabolic concentrating collectors. Final report  

SciTech Connect

Seven different compound parabolic concentrating (CPC) collector designs were tested by the ray trace method. The comparison of the collector was performed by simulating sunlight striking the designs at various angles of the sun during the course of the day. All of the CPC solar collector designs used the same type of reflective material, Kinglux reflective aluminum, which is a highly reflective surface used in solar applications. The CPC solar collector designs were subjected to a light source consisting of one helium-neon laser. The laser, to represent the effect of sunlight on the stationary CPC solar collector, was slowly moved across the aperture opening. This is explained in detail. Mathematic equations were used to develop the different CPC solar collector designs. The different shapes for each collector design, were acquired by varying the size of the absorber tube, and also by varying the acceptance angle of the collector. The seven CPC solar collector designs were tested, and the optimal design was selected for experimental testing.

Henry, J.P.; Gamble, N.T.; Cassidy, S.A.

1983-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Drilling investigations of crustal rifting processes in the Salton Trough, California  

DOE Green Energy (OSTI)

The paper describes the results of CSDP activities in the Salton Sea Geothermal Field (SSGF), concentrating on a shallow heat-flow survey, but also considering preliminary results from the Salton Sea Scientific Drilling Program (SSSDP). Whether the heat input rate to localized systems is high enough to account for the overall thermal budget of the Salton Trough is examined. (ACR)

Kasameyer, P.W.; Younker, L.W.; Newmark, R.L.; Duba, A.G.

1986-01-01T23:59:59.000Z

422

Hydrocarbon prospectivity assessment of the Southern Pattani Trough, Gulf of Thailand  

SciTech Connect

The Pattani Trough is an elongate north to south basin in the Gulf of Thailand offshore area that developed from Oligocene times onward. Numerous hydrocarbon discoveries, mainly gas, have been made within the Tertiary stratigraphic section in areas adjacent to the depocenter of the basin, but only dry holes have been drilled on the extreme basin margins and flanking platform areas. The southern Pattani Trough represents a [open quotes]transition zone[close quotes] in terms of potential hydrocarbon prospectivity between the low potential/high exploration risk basin marginal areas, and the high potential/low exploration risk basin marginal area. The development of hydrocarbon accumulation potential within the southern Pattani Trough can be related to a number of major controlling factors. These include structure, which on a regional scale shows a marked influence of tectonic regime on depositional system development, and on a more local scale determines trap development; stratigraphy, which determines reservoir geometry and potential hydrocarbon source rock facies distribution; petrology, which exerts a major control on depth related reservoir quality; overpressure development, which controls local migration pathways for generated hydrocarbons, and locally provides very efficient trap seals; geochemical factors, related to potential source facies distribution, hydrocarbon type; and thermal maturation of the section. The above factors have been combined to define low-, medium-, and high-risk exploration [open quotes]play fairways[close quotes] within the prospectivity transition zone of the southern Pattani Trough.

Mountford, N. (Unocal Thailand Ltd., Bangkok (Thailand))

1994-07-01T23:59:59.000Z

423

Topographically Controlled Flow Around a Deep Trough Transecting the Shelf off Kodiak Island, Alaska  

Science Conference Proceedings (OSTI)

Current measurements core the axis of a deep trough normal to the coast and from the adjacent shelf show that the mean flow is barotropic and follows depth contours, conserving potential vorticity, to form a cyclonic vortex or meander over the ...

Gary Lagerloef

1983-01-01T23:59:59.000Z

424

CANDLE BURNING IN AN INVERTED JAR OVER WATER IN A TROUGH EXPERIMENT: SCIENCE TEACHERS' CONCEPTIONS  

E-Print Network (OSTI)

CANDLE BURNING IN AN INVERTED JAR OVER WATER IN A TROUGH EXPERIMENT: SCIENCE TEACHERS' CONCEPTIONS contains about 20% oxygen despite our knowledge that burning in a closed environment does not consume during burning of carbon in oxygen (air) and the solubility rate of carbon dioxide in water

Knill, Oliver

425

Bull. Disas. Prey. Res. Inst., Kyoto Univ., Vol. 45, Part 2, 3 No. 389, February, 1996 27 Active Rift System in the Okinawa Trough and Its Northeastern  

E-Print Network (OSTI)

Active Rift System in the Okinawa Trough and Its Northeastern Continuation By Masaaki KIMURA (Manuscript investigations have revealed that the present central rift system of the Okinawa Trough which is an active Okinawa Trough can be distinguished. The crustal thinning and thus eastward drifting of the Ryukyu Arc may

Takada, Shoji

426

Design of a Transpired Air Heating Solar Collector with an Inverted Perforated Absorber and Asymmetric Compound Parabolic Concentrator.  

E-Print Network (OSTI)

?? absorber and an asymmetric compound parabolic concentrator was applied to increase the intensity of solar radiation incident on the perforated absorber. A 2D ray… (more)

Shams, Nasif

2013-01-01T23:59:59.000Z

427

Engi 9614: Special Topics in Environmental Engineering: Renewable Energy and Resource Conservation  

E-Print Network (OSTI)

solar electric plants from solar thermal and solar photovoltaic systems, parabolic trough plants, tower

Coles, Cynthia

428

Use of Linear Predictive Control for a Solar Electric Generating System  

E-Print Network (OSTI)

that use parabolic troughs in order to produce electricity from sunlight5 . The parabolic troughs are long, the temperature of the HTF leaving the parabolic trough collector is controlled by a skilled operator. He. Automatic control of the HTF in a parabolic trough collector through proportional control has been attempted

Wisconsin at Madison, University of

429

Photo: Saba Gul The first MIT Alumni ServiceTrip to the Napo Province in the Amazon Rainforest of Ecuador took place this past sum  

E-Print Network (OSTI)

International, won an IDEAS Competition award for their parabolic trough reflectors that provide clean

Polz, Martin

430

CHINA'S DUST AFFECTS SOLAR RESOURCE IN THE U.S.: A CASE STUDY Christian A. Gueymard Nels S. Laulainen  

E-Print Network (OSTI)

a significant im- pact. Concentrating systems such as parabolic troughs and solar tower plants utilize only

Oregon, University of

431

SOLAR TRA ING SENSORS FOR MAXIMUM SOLAR ON ENTRATOR EFFI IEN Y  

POTENTIAL APPLI ATIONS Parabolic dish & trough solar concentrating collectors Solar energy and renewable energy Electric utility

432

Piecewise parabolic negative magnetoresistance of two-dimensional electron gas with triangular antidot lattice  

SciTech Connect

Extraordinary piecewise parabolic behavior of the magnetoresistance has been experimentally detected in the two-dimensional electron gas with a dense triangular lattice of antidots, where commensurability magnetoresistance oscillations are suppressed. The magnetic field range of 0-0.6 T can be divided into three wide regions, in each of which the magnetoresistance is described by parabolic dependences with high accuracy (comparable to the experimental accuracy) and the transition regions between adjacent regions are much narrower than the regions themselves. In the region corresponding to the weakest magnetic fields, the parabolic behavior becomes almost linear. The observed behavior is reproducible as the electron gas density changes, which results in a change in the resistance by more than an order of magnitude. Possible physical mechanisms responsible for the observed behavior, including so-called 'memory effects,' are discussed.

Budantsev, M. V., E-mail: budants@isp.nsc.ru; Lavrov, R. A.; Pogosov, A. G.; Zhdanov, E. Yu.; Pokhabov, D. A. [Russian Academy of Sciences, Rzhanov Institute of Semiconductor Physics, Siberian Branch (Russian Federation)

2011-02-15T23:59:59.000Z

433

Wind load design methods for ground-based heliostats and parabolic dish collectors  

DOE Green Energy (OSTI)

The purpose of this design method is to define wind loads on flat heliostat and parabolic dish collectors in a simplified form. Wind loads are defined for both mean and peak loads accounting for the protective influence of upwind collectors, wind protective fences, or other wind-blockage elements. The method used to define wind loads was to generalize wind load data obtained during tests on model collectors, heliostats or parabolic dishes, placed in a modeled atmospheric wind in a boundary-layer wind-tunnel at Colorado State University. For both heliostats and parabolic dishes, loads are reported for solitary collectors and for collectors as elements of a field. All collectors were solid with negligible porosity; thus the effects of porosity in the collectors is not addressed.

Peterka, J.A.; Derickson, R.G. (Colorado State Univ., Fort Collins, CO (United States). Fluid Dynamics and Diffusion Lab.)

1992-09-01T23:59:59.000Z

434

A Two-Layer Quasi-Geostrophic Model of Summer Trough Formation in the Australian Subtropical Easterlies  

Science Conference Proceedings (OSTI)

A dominant feature of the low-level easterly wind flow in the Australian subtropics during summer is the trough development that occurs on both the western and eastern sides of the continent. This phenomenon is investigated analytically with a ...

C. B. Fandry; L. M. Leslie

1984-03-01T23:59:59.000Z

435

Precipitation Regimes during Cold-Season Central U.S. Inverted Trough Cases. Part I: Synoptic Climatology and Composite Study  

Science Conference Proceedings (OSTI)

This paper is the first of two papers that examines the organization of the precipitation field in central U.S. cold-season cyclones involving inverted troughs. The first portion of the study examines the varying precipitation distribution that ...

Robert A. Weisman; Keith G. McGregor; David R. Novak; Jason L. Selzler; Michael L. Spinar; Blaine C. Thomas; Philip N. Schumacher

2002-12-01T23:59:59.000Z

436

Erlangen Program at Large--2: Inventing a wheel. The parabolic one  

E-Print Network (OSTI)

We discuss parabolic versions of Euler's identity e^{it}=cos t + i sin t. A purely algebraic approach based on dual numbers is known to produce a very trivial relation e^{pt} = 1+pt. Therefore we use a geometric setup of parabolic rotations to recover the corresponding non-trivial algebraic framework. Our main tool is Moebius transformations which turn out to be closely related to induced representations of the group SL(2,R). Keywords: complex numbers, dual numbers, double numbers, linear algebra, invariant, computer algebra, GiNaC

Vladimir V. Kisil

2007-07-27T23:59:59.000Z

437

Parabolic Sturmians approach to the three-body continuum Coulomb problem  

E-Print Network (OSTI)

The three-body continuum Coulomb problem is treated in terms of the generalized parabolic coordinates. Approximate solutions are expressed in the form of a Lippmann-Schwinger type equation, where the Green's function includes the leading term of the kinetic energy and the total potential energy, whereas the potential contains the non-orthogonal part of the kinetic energy operator. As a test of this approach, the integral equation for the $(e^-,\\, e^-,\\, {{He}^{++}})$ system is solved numerically by using the parabolic Sturmian basis representation of the (approximate) potential. Convergence of the expansion coefficients of the solution is obtained as the basis set used to describe the potential is enlarged.

S. A. Zaytsev; Yu. V. Popov; B. Piraux

2011-08-19T23:59:59.000Z

438

On the iterated Crank-Nicolson for hyperbolic and parabolic equations in numerical relativity  

E-Print Network (OSTI)

The iterated Crank-Nicolson is a predictor-corrector algorithm commonly used in numerical relativity for the solution of both hyperbolic and parabolic partial differential equations. We here extend the recent work on the stability of this scheme for hyperbolic equations by investigating the properties when the average between the predicted and corrected values is made with unequal weights and when the scheme is applied to a parabolic equation. We also propose a variant of the scheme in which the coefficients in the averages are swapped between two corrections leading to systematically larger amplification factors and to a smaller numerical dispersion.

Gregor Leiler; Luciano Rezzolla

2006-01-31T23:59:59.000Z

439

Determination of a control parameter in a one-dimensional parabolic equation using the moving least-square approximation  

Science Conference Proceedings (OSTI)

In this paper the approximation of moving least-square (MLS) is used for finding the solution of a one-dimensional parabolic inverse problem with source control parameter. Comparing with other numerical methods based on meshes such as finite difference ... Keywords: inverse problem, meshless method, moving least-square approximation, overspecification, parabolic equation

Rongjun Cheng

2008-09-01T23:59:59.000Z

440

Fully discrete FEM-BEM method for a class of exterior nonlinear parabolic-elliptic problems in 2D  

Science Conference Proceedings (OSTI)

We considered a nonlinear parabolic equation in a bounded domain of R2 coupled with the Laplace equation in the corresponding exterior region. This kind of problems appears in the modelling of quasi-stationary electromagnetic fields. We chose ... Keywords: boundary elements, finite elements, parabolic-elliptic problem

María González

2006-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Many-body effects in wide parabolic AlGaAs quantum wells A. Tabata, M. R. Martins, and J. B. B. Oliveira  

E-Print Network (OSTI)

Many-body effects in wide parabolic AlGaAs quantum wells A. Tabata, M. R. Martins, and J. B. B gas in n-type wide parabolic quantum wells. A series of samples with different well widths at the Fermi level at low temperature only in the thinnest parabolic quantum wells. The suppression of the many

Gusev, Guennady

442

IASTED Conf. on Modeling, Identification and Control, February 14-17, 2000, Innsbuck, Austria 296 NYQUIST STABILITY TEST FOR A PARABOLIC PARTIAL  

E-Print Network (OSTI)

NYQUIST STABILITY TEST FOR A PARABOLIC PARTIAL DIFFERENTIAL EQUATION MIKLOS VAJTA Dept. of Mathematical.vajta@math.utwente.nl ABSTRACT The paper describes a Nyquist stability test applied to a parabolic partial differential equation differential equations. 1. PROBLEM STATEMENT A large class of parabolic partial differential equations (PDE

Al Hanbali, Ahmad

443

Homogenization of a degenerate parabolic problem in a highly heterogeneous medium with highly anisotropic fibers  

Science Conference Proceedings (OSTI)

We consider the homogenization of a heat transfer problem in a periodic medium, consisting of a set of highly anisotropic fibers surrounded by insulating layers, the whole being embedded in a third material having a conductivity of order 1. The conductivity ... Keywords: Degenerate parabolic problem, Highly anisotropic fibers, Highly heterogeneous medium, Homogenization

Ahmed Boughammoura

2009-01-01T23:59:59.000Z

444

The asymptotics of a solution of a parabolic equation as time increases without bound  

SciTech Connect

A boundary-value problem for a second order parabolic equation on a half-line is considered. A uniform asymptotic approximation to a solution to within any power of t{sup -1} is constructed and substantiated. Bibliography: 8 titles.

Degtyarev, Denis O; Il'in, Arlen M

2012-11-30T23:59:59.000Z

445

Solution blow-up for a class of parabolic equations with double nonlinearity  

SciTech Connect

We consider a class of parabolic-type equations with double nonlinearity and derive sufficient conditions for finite time blow-up of its solutions in a bounded domain under the homogeneous Dirichlet condition. To prove the solution blow-up we use a modification of Levine's method. Bibliography: 13 titles.

Korpusov, Maxim O [Lomonosov Moscow State University, Faculty of Physics, Moscow (Russian Federation)] [Lomonosov Moscow State University, Faculty of Physics, Moscow (Russian Federation)

2013-03-31T23:59:59.000Z

446

Brief paper: An LMI approach to H? boundary control of semilinear parabolic and hyperbolic systems  

Science Conference Proceedings (OSTI)

Exponential stability analysis and L"2-gain analysis are developed for scalar uncertain distributed parameter systems, governed by semilinear partial differential equations of parabolic and hyperbolic types. Sufficient exponential stability conditions ... Keywords: Distributed parameter systems, H? control, LMI, Lyapunov functional, Stability

Emilia Fridman; Yury Orlov

2009-09-01T23:59:59.000Z

447

Nuclear spin dynamics in parabolic quantum wells Ionel Tifrea* and Michael E. Flatte  

E-Print Network (OSTI)

Nuclear spin dynamics in parabolic quantum wells Ionel T¸ifrea* and Michael E. Flatte´ Department March 2004 We present a detailed analytical and numerical analysis of the nuclear spin dynamics of the electronic wave function in small electric fields. The nuclear spin relaxation via the hyperfine interaction

Flatte, Michael E.

448

The cylindrical parabolic mirror as reflector for solar collectors. Efficiencies and optimization  

DOE Green Energy (OSTI)

After introducing the concentration ratio and intercept factor of focusing collectors with parabolic cylinder mirrors, the energy balance equations were derived to determine the efficiencies under steady state conditions. The components of the collector were varied and optimized with respect to maximum efficiency. The dynamic behavior of the collector was calculated and the average efficiencies compared with the efficiencies in the steady state condition.

Koehne, R.

1976-10-27T23:59:59.000Z

449

Fault intersections and hybrid transform faults in the southern Salton Trough geothermal area, Baja California, Mexico  

DOE Green Energy (OSTI)

Analysis of 55 wells drilled at the Cerro Prieto Geothermal Field and a suite of geological and geophysical studies throughout the southern Salton Trough from the Mexican-United States border to the Gulf of California clarify two concepts important to geothermal development: (1) increased natural convective fluid flow and better permeability should occur at intersecting faults both regionally and within a producing field, and (2) the Cerro Prieto and Imperial faults are best conceived of as hybrid types having features of both San Andreas style wrench faults and oceanic tranform faults.

Vonder Haar, S.; Puente Cruz, I.

1979-07-01T23:59:59.000Z

450

Drivers of Residual Estuarine Circulation in Tidally Energetic Estuaries: Straight and Irrotational Channels with Parabolic Cross Section  

Science Conference Proceedings (OSTI)

The generation of residual circulation in a tidally energetic estuary with constant longitudinal salinity gradient and parabolic cross section is examined by means of a two-dimensional cross-sectional numerical model, neglecting river runoff and ...

Hans Burchard; Robert D. Hetland; Elisabeth Schulz; Henk M. Schuttelaars

2011-03-01T23:59:59.000Z

451

Parabolic sturmians approach to the three-body continuum Coulomb problem  

SciTech Connect

The three-body continuum Coulomb problem is treated in terms of the generalized parabolic coordinates. Approximate solutions are expressed in the form of a Lippmann-Schwinger-type equation, where the Green's function includes the leading term of the kinetic energy and the total potential energy, whereas the potential contains the non-orthogonal part of the kinetic energy operator. As a test of this approach, the integral equation for the (e{sup -}, e{sup -}, He{sup ++}) system has been solved numerically by using the parabolic Sturmian basis representation of the (approximate) potential. Convergence of the expansion coefficients of the solution has been obtained as the basis set used to describe the potential is enlarged.

Zaytsev, S. A., E-mail: zaytsev@fizika.khstu.ru [Pacific National University (Russian Federation); Popov, Yu. V. [Moscow State University, Nuclear Physics Institute (Russian Federation)] [Moscow State University, Nuclear Physics Institute (Russian Federation); Piraux, B. [Universite catholique de Louvain, Institute of Condensed Matter and Nanosciences (Belgium)] [Universite catholique de Louvain, Institute of Condensed Matter and Nanosciences (Belgium)

2013-03-15T23:59:59.000Z

452

Parabolic Coordinates and the Hydrogen Atom in Spaces H_{3} and S_{3}  

E-Print Network (OSTI)

The Coulomb problem for Schr\\"{o}dinger equation is examined, in spaces of constant curvature, Lobachevsky H_{3} and Riemann S_{3} models, on the base of generalized parabolic coordinates. In contrast to the hyperbolic case, in spherical space S_{3} such parabolic coordinates turn to be complex-valued, with additional constraint on them. The technique of the use of such real and complex coordinates in two space models within the method of separation of variables in Schr\\"{o}dinger equation with Kepler potential is developed in detail; the energy spectra and corresponding wave functions for bound states have been constructed in explicit form for both spaces; connections with Runge-Lenz operators in both curved space models are described.

V. M. Red'kov; E. M. Ovsiyuk

2011-08-31T23:59:59.000Z

453

Analysis of static and quasi-static cross compound parabolic concentrators  

SciTech Connect

Static and quasi-static concentrators present interesting characteristics for obtaining photovoltaic solar energy. In this work we study the characteristics of the crossed compound parabolic concentrator, formed by the intersection of two cyclindrical compound parabolic concentrators (CPC). Bifacial cells are used in this concentrator as a requirement for obtaining higher concentrations. Static and quasi-static concentrators see the sun as an extended source, so a simplified source model of radiance for the sky of Madrid is used. The figures of merit of a lossless concentrator are studied and the most important parameters influencing its optical behavior are discussed. We conclude that these concentrators obtain results that lead to a decrease in the cost of photovoltaic energy.

Molledo, A.G.; Luque, A.

1984-06-15T23:59:59.000Z

454

Homogenization of a singularly perturbed degenerated parabolic equation and application to seabed dune and megaripple morphodynamics in tided environment  

E-Print Network (OSTI)

In this paper we build models for short-term, mean-term and long-term dynamics of dune and megariple morphodynamics. They are models that are degenerated parabolic equations which are, moreover, singularly perturbed. We, then give an existence and uniqueness result for the short-term and mean-term models. This result is based on a time-space periodic solution existence result for degenerated parabolic equation that we set out. Finally the short-term model is homogenized.

Faye, Ibrahima; Seck, Diaraf

2009-01-01T23:59:59.000Z

455

Peculiarities of parabolic-barrier penetrability and thermal decay rate with the quantum diffusion approach  

SciTech Connect

With the quantum diffusion approach, the passing probability through the parabolic barrier is examined in the limit of linear coupling in the momentum between the collective subsystem and environment. The dependencies of the penetrability on time, energy, and the coupling strength between the interacting subsystems are studied. The quasistationary thermal decay rate from a metastable state is considered in the cases of linear couplings both in the momentum and in the coordinate.

Kuzyakin, R. A. [Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation); Omsk State Transport University, 644046 Omsk (Russian Federation); Sargsyan, V. V.; Adamian, G. G.; Antonenko, N. V. [Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation)

2011-06-15T23:59:59.000Z

456

Stabilization of solutions of quasilinear second order parabolic equations in domains with non-compact boundaries  

SciTech Connect

The first mixed problem with homogeneous Dirichlet boundary condition and initial function with compact support is considered for quasilinear second order parabolic equations in a cylindrical domain D=(0,{infinity})x{Omega}. Upper bounds are obtained, which give the rate of decay of the solutions as t{yields}{infinity} as a function of the geometry of the unbounded domain {Omega} subset of R{sub n}, n{>=}2. Bibliography: 18 titles.

Karimov, Ruslan Kh [Institute of Applied Research, Sterlitamak (Russian Federation); Kozhevnikova, Larisa M [Sterlitamak State Pedagogical Academy, Sterlitamak (Russian Federation)

2010-11-11T23:59:59.000Z

457

The relative isoperimetric inequality on a conformally parabolic manifold with boundary  

SciTech Connect

For an arbitrary noncompact n-dimensional Riemannian manifold with a boundary of conformally parabolic type it is proved that there exists a conformal change of metric such that a relative isoperimetric inequality of the same form as in the closed n-dimensional Euclidean half-space holds on the manifold with the new metric. This isoperimetric inequality is asymptotically sharp. Bibliography: 6 titles.

Kesel'man, Vladimir M [Moscow State Industrial University, Moscow (Russian Federation)

2011-07-31T23:59:59.000Z

458

Dielectric compound parabolic concentrating solar collector with a frustrated total internal reflection absorber  

SciTech Connect

Coupling a dielectric compound parabolic concentrator (DCPC) to an absorber across a vacuum gap by means of frustrated total internal reflection (FTIR) can theoretically approach the maximum concentration permitted by physical laws, thus allowing higher radiative fluxes in thermal applications. The calculated optical performance of 2-D DCPCs with FTIR absorbers indicates that the ratio of gap thickness to optical wavelength must be /0.22 before the optical performance of the DCPC is superior to that of the nondielectric CPC.

Hull, J.R.

1989-01-01T23:59:59.000Z

459

Dielectric compound parabolic concentrating solar collector with frustrated total internal reflection absorber  

SciTech Connect

Since its introduction, the concept of nonimaging solar concentrators, as exemplified by the compound parabolic concentrator (CPC) design, has greatly enhanced the ability to collect solar energy efficiently in thermal and photovoltaic devices. When used as a primary concentrator, a CPC can provide significant concentration without the complication of a tracking mechanism and its associated maintenance problems. When used as a secondary, a CPC provides higher total concentration, or for a fixed concentration, tolerates greater tracking error in the primary.

Hull, J.R.

1988-01-01T23:59:59.000Z

460

Investigation on the prediction of thermal performance of compound parabolic concentrators  

SciTech Connect

The present paper focuses attention on the prediction of thermal performance of a compound parabolic concentrator for different values of insolation and mass flow rate of collector medium (water), under steady-state conditions. The analysis involves an iterative scheme and a method is proposed by which the absorber temperature, outlet temperature and glazing temperature can be predicted for given insolation and mass flow rate. 4 refs.

Hariprasad, C.R.; Natarajan, R.; Gupta, M.C.

1981-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" 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

Energetic protons from an ultraintense laser interacting with a symmetric parabolic concave target  

SciTech Connect

A scheme of a symmetric parabolic concave target irradiated by an ultraintense laser for efficient proton acceleration is proposed and involved problem is studied by using two-dimensional particle-in-cell (PIC) simulations. Results indicate that on one hand, the laser field is focused by the front parabolic concave surface of target and, on the other hand, more energetic hot electrons will traverse to the rear surface of target due to concave shape. The space-charge-separation field, induced by those hot electrons escaping form parabolic concave rear surface of target, can accelerate protons to relatively high energy with narrow energy spread. The dependence of the efficiency of proton acceleration on the target parameters is examined, and the optimal target parameters are obtained. Particle-in-cell simulations show that the proton peak energy and energy spread are greatly enhanced when the target parameters are chosen optimal, for example, a proton bunch with the maximum energy {approx}27.5 MeV and energy spread {approx}7% can be generated. Some implications of our results to experiments and comparisons with the other works are also discussed briefly.

Ali Bake, Muhammad; Xie Baisong [Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875 (China); Shan Zhang [Department of Mathematics and Physics, Shijiazhuang Tiedao University, Shijiazhuang 050043 (China); Wang Hongyu [Department of Physics, Anshan Normal University, Anshan 114005 (China); Shanghai Bright-Tech Information Technology Co. Ltd, Shanghai 200136 (China)

2013-03-15T23:59:59.000Z

462

A Diagnostic Study of an Explosively Developing Extratropical Cyclone and an Associated 500-hPa Trough Merger  

Science Conference Proceedings (OSTI)

This paper presents a diagnosis of an explosively developing cyclone (1.3 Ber) that occurred in conjunction with a 500-hPa synoptic-scale trough merger over the eastern United States in November 1999. The explosive development occurred in ...

Jennifer L. S. Strahl; Phillip J. Smith

2001-09-01T23:59:59.000Z

463

Possible Linkage between the Monsoon Trough Variability and the Tropical Cyclone Activity over the Western North Pacific  

Science Conference Proceedings (OSTI)

The present study investigates the influence of the monsoon trough (MT) on the interannual variability of tropical cyclone (TC) activity over the western North Pacific during July–November for the period 1979–2007. It is shown that the TC activity ...

Liang Wu; Zhiping Wen; Ronghui Huang; Renguang Wu

2012-01-01T23:59:59.000Z

464

Seasonality of the Kuroshio Path Destabilization Phenomenon in the Okinawa Trough: A Numerical Study of Its Mechanism  

Science Conference Proceedings (OSTI)

Previous observations have indicated that the Kuroshio’s path in the northern Okinawa Trough of the East China Sea is destabilized and accompanied by meanders with periods of 1–3 months during the winter–spring period. The present study ...

Hirohiko Nakamura; Masami Nonaka; Hideharu Sasaki

2010-03-01T23:59:59.000Z

465

Precipitation Regimes during Cold-Season Central U.S. Inverted Trough Cases. Part II: A Comparative Case Study  

Science Conference Proceedings (OSTI)

This is the second of two papers that examine the organization of the precipitation field during central U.S. cold-season cyclones involving inverted troughs (ITs). The first paper (Part I) used a climatology and composites to find synoptic-scale ...

Philip N. Schumacher; Gregory Frosig; Jason L. Selzler; Robert A. Weisman

2008-08-01T23:59:59.000Z

466

488 Brazilian Journal of Physics, vol. 36, no. 2A, June, 2006 Spin Valve Effect and Hall Resistance in a Wide Parabolic Well  

E-Print Network (OSTI)

in a Wide Parabolic Well C. A. Duarte, G. M. Gusev, A. A. Quivy, and T. E. Lamas Instituto de F´isica da observation of the Hall slope change in wide AlcGa1-cAs parabolic wells in the presence of a quasi on the electron density; it is observed only in parabolic wells, which are almost completely filled by electrons

Gusev, Guennady

467

Performance and testing of a stationary concentrating collector. [Compound parabolic concentrators coupled to tubular evacuated receivers  

DOE Green Energy (OSTI)

The development of nonimaging solar collectors for heating and cooling applications is reported. A totally stationary concentrating collector has been designed, built, and tested. The collectors employ compound parabolic concentrators coupled to tubular evacuated receivers. Performance of the collector is substantially better than flat plate collectors, and the collectors are suitable for powering mechanically driven air conditioning systems as well as conventional absorption cycle machines. This collector concept was awarded an IR-100 award by Industrial Research Magazine as one of the 100 most significant new developments in 1977.

Cole, R L; Allen, J W; Levitz, N M; McIntire, W R; Schertz, W W

1977-01-01T23:59:59.000Z

468

Omnium-G parabolic dish optical efficiency: a comparison of two independent measurement techniques  

DOE Green Energy (OSTI)

Measurements made at SERI of the optical efficiency of the Omnium-G parabolic dish concentrator are described. Two independent techniques were used: the cold-water calorimeter method and the heat of fusion method. Results from both techniques agree quite well and indicate that the optical efficiency for a 10-cm receiver aperture is 25%. Optical efficiency measured in early 1979 was 37%, and in mid 1979 it had degraded to 21%. An optical alignment procedure is described that resulted in the increase in optical efficiency from 21% to the current value of 25%.

Bohn, M.; Gaul, H.

1980-10-01T23:59:59.000Z

469

Initial evolution of supports of solutions of quasilinear parabolic equations with degenerate absorption potential  

SciTech Connect

The propagation of supports of solutions of second-order quasilinear parabolic equations is studied; the equations are of the type of nonstationary diffusion, having semilinear absorption with an absorption potential which degenerates on the initial plane. We find sufficient conditions, which are sharp in a certain sense, on the relationship between the boundary regime and the type of degeneration of the potential to ensure the strong localization of solutions. We also establish a weak localization of solutions for an arbitrary potential which degenerates only on the initial plane. Bibliography: 12 titles.

Stepanova, Ekaterina V; Shishkov, Andrey E

2013-03-31T23:59:59.000Z

470

The Cauchy problem for a quasilinear parabolic equation with gradient absorption  

SciTech Connect

The qualitative properties of solutions to the Cauchy problem for a degenerate parabolic equation containing a nonlinear operator of Baouendi-Grushin type and with gradient absorption whose density depends on time, as well as the space variables, are investigated. Bounds for the diameter of the support of the solution which are sharp with respect to time are obtained, together with its maximum. A condition which determines whether or not the phenomenon of decay to zero of the total mass of the solution occurs is discovered. Bibliography: 35 titles.

Markasheva, Vera A; Tedeev, Anatoli F [Institute of Applied Mathematics and Mechanics, Ukraine National Academy of Sciences, Donetsk (Ukraine)

2012-04-30T23:59:59.000Z

471

Proceedings: fourth parabolic-dish solar-thermal power program review  

DOE Green Energy (OSTI)

The primary objective of the review was to present the results of activities within the Parabolic Dish Technology and Applications Development element of the Department of Energy's Solar Thermal Energy Systems Program. The Review consisted of 6 technical sessions, covering Stirling, Organic Rankine and Brayton module technologies, associated hardware and test results to date; concentrator development and progress; economic analyses; and current international dish development activities. Two panel discussions, concerning industry issues affecting solar thermal dish development and dish technology from a utility/user perspective, were also held. These Proceedings contain the texts of presentations made at the review, which are abstracted separately for EDB.

Not Available

1983-02-01T23:59:59.000Z

472

Measured performances of curved inverted-vee, absorber compound parabolic concentrating solar-energy collectors  

SciTech Connect

The design and thermal performance of modified compound parabolic concentrating (CPC) solar-energy collectors are described. The designs incorporate a curved inverted-Vee absorber fin, which allows a reflector of simple geometry to be used. This CPC collector, has exhibited a superior performance to that of a conventional cusp-reflector CPC design, owing to the enhancement of the optical efficiency obtained by eliminating gap optical losses and an enhanced heat removal factor. The consequence upon the performance of a further design refinement, which inhibited the convective heat losses, is also reported.

Norton, B. (Univ. of Ulster at Jordanstown (Ireland)); Prapas, D.E. (Aristotle Univ. of Thessaloniki (Greece)); Eames, P.C.; Probert, S.D. (Cranfield Institute of Technology, Bedford (England))

1989-01-01T23:59:59.000Z

473

The performance of bifacial solar cells in prism-coupled compound parabolic concentrators  

SciTech Connect

Fixed compound parabolic concentrators that couple radiation to solar cells through a prism-shaped dielectric medium were matched to bifacial solar cell arrays. Measures of annual-average short-circuit current output relative to the output with conventional panel operation of the arrays gave optical gains of approximately four times with symmetrical but simulated bifacial arrays and approximately three times with the asymmetrical Westinghouse bifacial arrays. When passive thermosyphon cooling was provided, the power gains measured at peak solar intensity were similar to the optical gains.

Edmonds, I.R. (Queensland Univ. of Technology, Brisbane (Australia))

1992-01-01T23:59:59.000Z

474

Analysis of the incidence angle of the beam radiation on CPC. [Compound Parabolic Concentrator  

SciTech Connect

Analytic expressions have been derived for the projected incidence angles {var theta}{sub 1} and {var theta}{sub 2} from a two-dimensional compound parabolic concentrator solar collector. For a CPC the fraction of the incident rays on the aperture at angle {var theta}, which reaches the absorber, depends only on the {var theta}{sub 1} angle. In this paper, a mathematical expression for {var theta}{sub 1} and {var theta}{sub t} has been calculated to determine the times at which acceptance of the sun's beam radiation begins and ceases for a CPC consisting of arbitrary orientation.

Pinazo, J.M.; Canada, J.; Arago, F. (Univ. Politecnica de Valencia (Spain))

1992-09-01T23:59:59.000Z

475

An experimental study of free convection in compound parabolic concentrator (CPC) cavities  

SciTech Connect

An experimental study of the free convection heat transfer between the cylindrical absorber and the flat top of a compound parabolic concentrator (CPC) is described. Results are obtained for a range of absorber temperatures and four CPC cavity heights. For similar conditions of operating temperature, the heat transfer from a cylinder in free air is about 30 to 50 percent higher than in a CPC cavity. Two correlations for Nusselt and Grashof numbers have been obtained using the equivalent length and the cavity height as the characteristic length of the system.

Chew, T.C.; Wijeysundera, N.E.; Tay, A.O.

1988-11-01T23:59:59.000Z

476

Collector/Receiver Characterization (Fact Sheet), Thermal Systems...  

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

radiation falling on the trough aperture operating near ambient temperature to the thermal energy collected by the fluid flowing through the receiver tube. A parabolic trough,...

477

DOE-Funded Research Projects Win 46 R&D 100 Awards for 2009 ...  

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

if it is frequently and fully discharged. (Jointly with Planar Energy Devices) SkyTroughT Parabolic Trough Solar Concentrating Collector - uses a lightweight and weatherproof...

478

Solar reforming of methane in a direct absorption catalytic reactor on a parabolic dish  

DOE Green Energy (OSTI)

The concept of solar driven chemical reactions in a commercial-scale volumetric receiver/reactor on a parabolic concentrator was successfully demonstrated in the CAtalytically Enhanced Solar Absorption Receiver (CAESAR) test. Solar reforming of methane (CH{sub 4}) with carbon dioxide (CO{sub 2}) was achieved in a 64-cm diameter direct absorption reactor on a parabolic dish capable of 150 kW solar power. The reactor was a catalytic volumetric absorber consisting of a multi-layered, porous alumina foam disk coated with rhodium (Rh) catalyst. The system was operated during both steady-state and solar transient (cloud passage) conditions. The total solar power absorbed reached values up to 97 kW and the maximum methane conversion was 70%. Receiver thermal efficiencies ranged up to 85% and chemical efficiencies peaked at 54%. The absorber performed satisfactorily in promoting the reforming reaction during the tests without carbon formation. However, problems of cracking and degradation of the porous matrix, nonuniform dispersion of the Rh through the absorber, and catalyst deactivation due to sintering and possible encapsulation, must be resolved to achieve long-term operation and eventual commercialization. 17 refs., 11 figs., 1 tab.

Muir, J.F.; Hogan, R.E. Jr.; Skocypec, R.D. (Sandia National Labs., Albuquerque, NM (USA)); Buck, R. (Deutsche Forschungsanstalt fuer Luft- und Raumfahrt e.V. (DLR), Stuttgart (Germany, F.R.). Inst. fuer Technische Thermodynamik)

1990-01-01T23:59:59.000Z

479

Convection heat loss from cavity receiver in parabolic dish solar thermal power system: A review  

SciTech Connect

The convection heat loss from cavity receiver in parabolic dish solar thermal power system can significantly reduce the efficiency and consequently the cost effectiveness of the system. It is important to assess this heat loss and subsequently improve the thermal performance of the receiver. This paper aims to present a comprehensive review and systematic summarization of the state of the art in the research and progress in this area. The efforts include the convection heat loss mechanism, experimental and numerical investigations on the cavity receivers with varied shapes that have been considered up to date, and the Nusselt number correlations developed for convection heat loss prediction as well as the wind effect. One of the most important features of this paper is that it has covered numerous cavity literatures encountered in various other engineering systems, such as those in electronic cooling devices and buildings. The studies related to those applications may provide valuable information for the solar receiver design, which may otherwise be ignored by a solar system designer. Finally, future development directions and the issues that need to be further investigated are also suggested. It is believed that this comprehensive review will be beneficial to the design, simulation, performance assessment and applications of the solar parabolic dish cavity receivers. (author)

Wu, Shuang-Ying; Xiao, Lan; Li, You-Rong [College of Power Engineering, Chongqing University, Chongqing 400044 (China); Cao, Yiding [Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174 (United States)

2010-08-15T23:59:59.000Z

480

Nomographic methodology for use in performance trade-off studies of parabolic dish solar power modules  

DOE Green Energy (OSTI)

A simple graphical method has been developed to undertake technical design trade-off studies for individual parabolic dish modules comprising a two-axis tracking parabolic dish with a cavity receiver and power conversion assembly at the focal point. The results of these technical studies can then be used in performing the techno-economic analyses required for determining appropriate subsystem sizing. Selected graphs that characterize the performance of subsystems within the module have been arranged in the form of a nomogram that would enable an investigator to carry out several design trade-off studies. Key performance parameters encompassed in the nomogram include receiver losses, intercept factor, engine rating, and engine efficiency. Design and operation parameters such as concentrator size, receiver type (open or windowed aperture), receiver aperture size, operating temperature of the receiver and engine, engine partial load characteristics, concentrator slope error, and the type of reflector surface, are also included in the graphical solution. Cost considerations are not included. The nomogram has been used to perform trade-off studies that have provided a basis for determining requirements for a single concentrator that could perform satisfactorily with either the selected Stirling or Brayton engine. This activity is summarized to illustrate the usage of the nomogram. Additionally, modeling relations used in developing the nomogram are presented so that the nomogram can be updated to reflect any changes in the performance characteristics of projected components.

Selcuk, M. K.; Fujita, T.

1984-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "baseload parabolic trough" from the National Library of EnergyBeta (NLEBeta).
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481

Wind loads on heliostats and parabolic dish collectors: Final subcontractor report  

DOE Green Energy (OSTI)

A major intent of this study was to define wind load reduction factors for parabolic dish solar collectors within a field protected by upwind collectors, wind protective fences, or other blockages. This information will help researchers improve the economy of parabolic collector support structures and drive mechanisms. The method used in the study was to generalize wind load data obtained during tests on model collectors placed in a modeled atmospheric wind in a boundary-layer wind tunnel. A second objective of the study was to confirm and document a sensitivity in load to level of turbulence, or gustiness, in the approaching wind. A key finding was that wind-load reduction factors for forces (horizontal and vertical) were roughly similar to those for flat heliostats, with some forces significantly less than those for flat shapes. However, load reductions for moments showed a smaller load reduction, particularly for the azimuth moment. The lack of load reduction could be attributed to collector shape, but specific flow features responsible for and methods to induce a load reduction were not explored. 62 figs., 13 tabs.

Peterka, J.A.; Tan, Z.; Bienkiewicz, B.; Cermak, J.E.

1988-11-01T23:59:59.000Z

482

Shallow hydrothermal regime of the East Brawley and Glamis known geothermal resource areas, Salton Trough, California  

DOE Green Energy (OSTI)

Thermal gradients and thermal conductivities were obtained in real time using an in situ heat-flow technique in 15 shallow (90 to 150 m) wells drilled between Brawley and Glamis in the Imperial Valley, Southern California. The in situ measurements were supplemented by follow-up conventional temperature logs in seven of the wells and by laboratory measurements of thermal conductivity on drill cuttings. The deltaic sedimentary material comprising the upper approx. 100 m of the Salton Trough generally is poorly sorted and high in quartz resulting in quite high thermal conductivities (averaging 2.0 Wm/sup -1/ K/sup -1/ as opposed to 1.2 to 1.7 for typical alluvium). A broad heat-flow anomaly with maximum of about 200 mWm/sup -2/ (approx. 5 HFU) is centered between Glamis and East Brawley and is superimposed on a regional heat-flow high in excess of 100 mWm/sup -2/ (> 2.5 HFU). The heat-flow high corresponds with a gravity maximum and partially with a minimum in electrical resistivity, suggesting the presence of a hydrothermal system at depth in this area.

Mase, C.W.; Sass, J.H.; Brook, C.A.; Munroe, R.J.

1981-01-01T23:59:59.000Z

483

Well-posedness of a parabolic moving-boundary problem in the setting of Wasserstein gradient flows  

E-Print Network (OSTI)

We develop a gradient-flow framework based on the Wasserstein metric for a parabolic moving-boundary problem that models crystal dissolution and precipitation. In doing so we derive a new weak formulation for this moving-boundary problem and we show that this formulation is well-posed. In addition, we develop a new uniqueness technique based on the framework of gradient flows with respect to the Wasserstein metric. With this uniqueness technique, the Wasserstein framework becomes a complete well-posedness setting for this parabolic moving-boundary problem.

Jacobus W. Portegies; Mark A. Peletier

2008-12-06T23:59:59.000Z

484

Single-photon single-ion interaction in free space configuration in front of a parabolic mirror  

E-Print Network (OSTI)

The efficient interaction between single photons and single matter objects in free space is of key importance for quantum technologies. An experimental setup for testing this possibility involves single two-level ion trapped at the focus of a parabolic metallic mirror. We study the conditions for the setup, under which the assumption about the free-space mode structure of the radiation field in the vicinity of the atom is justified. In our analysis we apply vectorial properties of light by including polarization degree of freedom. We look for possible changes in the spontaneous emission rate of the atom resulting from the presence of the parabolic boundary conditions.

Magdalena Stobi?ska; Robert Alicki

2009-05-25T23:59:59.000Z

485

The Presidents' Day Cyclone of 18–19 February 1979: Influence of Upstream Trough Amplification and Associated Tropopause Folding on Rapid Cyclogenesis  

Science Conference Proceedings (OSTI)

A diagnostic analysis of an amplifying polar jet-trough system and associated tropopause fold which preceded the 19 February 1979 Presidents' Day cyclone is presented. The analysis is based on conventional radiosonde data, infrared and visible ...

Louis W. Uccellini; Daniel Keyser; Keith F. Brill; Carlyle H. Wash

1985-06-01T23:59:59.000Z

486

A Brief Practical Guide to Eddy Covariance Flux  

E-Print Network (OSTI)

........................................................................................................................... 27 Power towers for the production of mechanical work and electricity. Parabolic troughs and power towers reach peak efficiencies of parabolic troughs and power towers, thermal storage increases the annual capacity factor7 from typically 20

Noone, David

487

NEW METHOD AND SOFTWARE FOR MULTI-VARIABLE TECHNO-ECONOMIC DESIGN OPTIMIZATION OF CSP PLANTS  

E-Print Network (OSTI)

to a 50 MWel parabolic trough power plant using thermal oil as heat transfer fluid (HTF), a molten salt, parabolic trough 1. Motivation (Introduction) Today, designs of solar thermal power plants are developed

Ábrahám, Erika

488

Enhanced Hall slope in wide AlxGax-1As parabolic wells A. M. Ortiz de Zevallos, N. C. Mamani, G. M. Gusev, A. A. Quivy, and T. E. Lamas  

E-Print Network (OSTI)

Enhanced Hall slope in wide AlxGax-1As parabolic wells A. M. Ortiz de Zevallos, N. C. Mamani, G. M report measurements of the Hall effect in 1000­4000 � wide AlxGax-1As parabolic wells with quasi- two resistance for wide parabolic wells is found to be enhanced when the temperature decreases. We attribute

Gusev, Guennady

489

An Efficient Hybrid Parabolic Equation --- Integral Equation Method for the Analysis of Wave Propagation in Highly Complex Indoor Communication Environments  

Science Conference Proceedings (OSTI)

An efficient, full-wave computational technique to investigate the electromagnetic wave propagation within a complex building environment, resulting from contemporary indoor communication systems, is proposed. Unlike a standard ray-tracing technique, ... Keywords: indoor communications, integral equations, parabolic equation, ray-tracing, wave propagation

G. K. Theofilogiannakos; T. V. Yioultsis; T. D. Xenos

2007-10-01T23:59:59.000Z

490

Study on the Principle and Technology of Coal and Methane Simultaneous Extraction Based on the Mining Fissure Elliptic Parabolic Zone  

Science Conference Proceedings (OSTI)

Coal and coal-bed methane are all valuable energy resource, if they can be extracted simultaneously and safely, the triple purposes of mine safety production, new energy resource supply and environment protection can be fulfilled. The coal-bed methane ... Keywords: Mining induced fissure, Elliptic Parabolic Zone, Relieved methane, Coal, methane simultaneous extraction

Lin Haifei; Li Shugang; Cheng Lianhua; Pan Hongyu

2011-02-01T23:59:59.000Z

491

P-adic Elliptic Quadratic Forms, Parabolic-Type Pseudodifferential Equations With Variable Coefficients, and Markov Processes  

E-Print Network (OSTI)

In this article we study the Cauchy problem for a new class of parabolic-type pseudodifferential equations with variable coefficients for which the fundamental solutions are transition density functions of Markov processes in the four dimensional vector space over the field of p-adic numbers.

O. F. Casas-Sánchez; W. A. Zúñiga-Galindo

2013-11-29T23:59:59.000Z

492

Eyelid and eyelash detection method in the normalized iris image using the parabolic Hough model and Otsu's thresholding method  

Science Conference Proceedings (OSTI)

Eyelids and eyelashes occluding the iris region are noise factors that degrade the performance of iris recognition. If they are incorrectly classified as an iris region, the false iris region information decreases the recognition rate. Thus, reliable ... Keywords: Eyelash detection, Eyelid detection, Iris recognition, Parabolic Hough model, Thresholding

Tae-Hong Min; Rae-Hong Park

2009-09-01T23:59:59.000Z

493

Precise asymptotics for the parabolic Anderson model with a moving catalyst or trap  

E-Print Network (OSTI)

We consider the solution $u\\colon [0,\\infty) \\times\\mathbb{Z}^d\\rightarrow [0,\\infty) $ to the parabolic Anderson model, where the potential is given by $(t,x)\\mapsto\\gamma\\delta_{Y_t}\\left(x\\right)$ with $Y$ a simple symmetric random walk on $\\mathbb{Z}^d$. Depending on the parameter $\\gamma\\in[-\\infty,\\infty)$, the potential is interpreted as a randomly moving catalyst or trap. In the trap case, i.e., $\\gamma0$), we consider the solution $u$ from the perspective of the catalyst, i.e., the expression $u(t,Y_t+x)$. Focusing on the cases where moments grow exponentially fast (that is, $\\gamma$ sufficiently large), we describe the moment asymptotics of the expression above up to equivalence. Here, it is crucial to prove the existence of a principal eigenfunction of the corresponding Hamilton operator. While this is well-established for the first moment, we have found an extension to higher moments.

Schnitzler, Adrian

2010-01-01T23:59:59.000Z

494

STRESS ANALYSIS OF SPECIMENS FOR IN-PILE CREEP TESTS OF PARABOLIC GRAPHITE BEAMS  

SciTech Connect

The irradiation-induced creep of graphite is being investigated in experiments that consist of loading parabolically shaped cantilever beams at the free end and measuring the resulting deflections with time. A series of stress analyses was made to verify the applicability of the elementary strength-of- materials approach for obtaining relations between stress and creep strain from the load-deflection data. The results of the analyses, which included a theory- of-elasticity solution, an evaluation of the effect of shear, and a bending analysis using an actual stress-strain diagram for graphite, show that an elementary strength-of-materials approach is adequate to predict the initial or elastic stresses. Preliminary results from the in-pile experiments indicate that the creep strains are linear with stress; thus the initially linear bending stress distribution given by the elementary theory remains unchanged during creep. (auth)

Corum, J.M.

1964-02-01T23:59:59.000Z

495

Mixed finite-difference/integral transform approach for parabolic-hyperbolic problems in transient forced convection  

SciTech Connect

The integral transform method is employed in conjunction with second-order-accurate explicit finite-differences schemes, to handle accurately a class of parabolic-hyperbolic problems that appear in connection with transient forced convection inside ducts. The integral transformation process eliminates the independent variables in which the diffusion phenomena predominate. A system of coupled hyperbolic equations then results, involving time and the space coordinates in which convection is dominant, which is solved numerically through a modified upwind second-order finite-difference scheme. Stability and convergence characteristics of the proposed mixed approach are also examined. Typical applications in two- and three-dimensional geometries are considered, for both slug and laminar flow situations.

Cotta, R.M.; Gerk, J.E.V. (Univ. Federal do Rio de Janeiro (Brazil). Dept. de Engenharia Mecanica)

1994-06-01T23:59:59.000Z

496

Analytic Q-ball solutions and their stability in a piecewise parabolic potential  

E-Print Network (OSTI)

Explicit solutions for extended objects of a Q-ball type were found analytically in a model describing complex scalar field with piecewise parabolic potential in (3+1)- and (1+1)-dimensional space-times. Such a potential provides a variety of solutions which were thoroughly examined. It was shown that, depending on the values of the parameters of the model and according to the known stability criteria, there exist stable and unstable solutions. The classical stability of solutions in (1+1)-dimensional space-time was examined in the linear approximation and it was shown explicitly that the spectrum of linear perturbations around some solutions contains exponentially growing modes while it is not so for other solutions.

I. E. Gulamov; E. Ya. Nugaev; M. N. Smolyakov

2013-03-05T23:59:59.000Z

497

THE STRUCTURE OF THE M87 JET: A TRANSITION FROM PARABOLIC TO CONICAL STREAMLINES  

SciTech Connect

The structure of the M87 jet, from milliarcsecond to arcsecond scales, is extensively investigated, utilizing the images taken with the European VLBI Network, MERLIN, and Very Long Baseline Array. We discover that the jet maintains a parabolic streamline over a range in size scale equal to 10{sup 5} times the Schwarzschild radius. The jet then transitions into a conical shape farther downstream. This suggests that the magnetohydrodynamic jet is initially subjected to the confinement by the external gas which is dominated by the gravitational influence of the supermassive black hole. Afterward the jet then freely expands with a conical shape. This geometrical transition indicates that the origin of the HST-1 complex may be a consequence of the overcollimation of the jet. Our result suggests that when even higher angular resolution is provided by a future submillimeter very long baseline interferometry experiments, we will be able to explore the origin of active galactic nucleus jets.

Asada, Keiichi; Nakamura, Masanori, E-mail: asada@asiaa.sinica.edu.tw, E-mail: nakamura@asiaa.sinica.edu.tw [Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan (China)

2012-02-15T23:59:59.000Z

498

Importance of non-parabolic band effects in the thermoelectric properties of semiconductors  

SciTech Connect

We present an analysis of the thermoelectric properties of of n-type GeTe and SnTe in relation to the lead chalcogenides PbTe and PbSe. We find that the singly degenerate conduction bands of semiconducting GeTe and SnTe are highly non-parabolic, even very close to the band edges. This leads to isoenergy surfaces with a strongly corrugated shape that is clearly evident at carrier concentrations well below 0.005 e per formula unit. Analysis within Boltzmann theory shows that this corrugation is favorable for the thermoelectric transport. As a result these materials may exhibit n-type performance exceeding that of the lead chalcogenides.

Singh, David J [ORNL] [ORNL; Parker, David S [ORNL] [ORNL; Chen, Xin [ORNL] [ORNL

2013-01-01T23:59:59.000Z

499

A 32 m Parabolic Antenna in Peru At 3,370m of Altitude  

E-Print Network (OSTI)

At the altitude of 3,370 m on the Peruvian Andes, a 32m antenna owned by the telecommunications company Telefonica del Peru will be transformed to a Radio Telescope, it would be transferred to the Geophysical Institute of Peru (IGP). The parabolic antenna was constructed in 1984 by Nippon Electric Co. (NEC) and worked as an INTELSAT station until 2000. A team of the National Observatory of Japan (NAOJ) evaluated the antenna in 2003 and reported its availability to be used as a Radio Telescope. In collaboration of the NAOJ a 6.7 GHz receiver is under construction and will be installed within this year. Initially the telescope as a single dish will monitor and survey Methanol Maser of YSO, higher frequencies equipment and VLBI instruments will be considered. The antenna will be managed by the IGP and used by universities in Peru, becoming a VLBI station will be a grate contribution to astronomy and geodetic community.

J. Ishitsuka; M. Ishitsuka; N. Kaifu; S. Miyama; M. Inoue; M. Tsuboi; M. Ohishi; K. Fujisawa; T. Kasuga; K. Miyazawa; S. Horiuchi

2005-01-04T23:59:59.000Z

500

Estimates in Generalized Morrey Spaces for Weak Solutions to Divergence Degenerate Parabolic Systems  

E-Print Network (OSTI)

Let $\\mathrm{X}=(X_{1},...,X_{q})$ be a family of real smooth vector fields satisfying H\\"{o}mander's condition. The purpose of this paper is to establish gradient estimates in generalized Morrey spaces for weak solutions of the divergence degenerate parabolic system related to $X$ :%\\[u_{t}^{i}+X_{\\alpha}^{\\ast}(a_{ij}^{\\alpha\\beta}(z)X_{\\beta}u^{j}%)=g_{i}+X_{\\alpha}^{\\ast}f_{i}^{\\alpha}(z), \\] where $\\alpha,\\beta=1,2,...,q,$ $i,j=1,2,...,N$, $X_{\\alpha}^{\\ast}$ is the transposed vector field of $X_{\\alpha}$, $z=(t,x)\\in{\\mathbb{R}}^{n+1}$, and coefficients $a_{ij}^{\\alpha\\beta}(z)$ belong to the space $VMO$ induced by the vector fields $X_{1}, ...,X_{q}$.

Dong, Yan; Niu, Pengcheng

2011-01-01T23:59:59.000Z