Sample records for thermal concentrating collectors

  1. Concentrating collectors

    SciTech Connect (OSTI)

    Not Available

    1981-06-01T23:59:59.000Z

    Selected specifications from sixteen concentrating collector manufacturers are tabulated. Eleven are linear parabolic trough collectors, and the others include slats, cylindrical trough, linear Fresnel lens, parabolic cylindrical Fresnel lens, and two point focus parabolic dish collectors. Also included is a brief discussion of the operating temperatures and other design considerations for concentrating collectors. (LEW)

  2. A solar concentrating photovoltaic / thermal collector J.S. Coventry

    E-Print Network [OSTI]

    A solar concentrating photovoltaic / thermal collector J.S. Coventry Centre for Sustainable Energy.Coventry@anu.edu.au Abstract Australia is a good location for solar concentrator applications. Current activities in Australia OF THE SOLAR RESOURCE IN AUSTRALIA Australia has relatively high solar insolation, as shown in figure 1

  3. PERFORMANCE OF A CONCENTRATING PHOTOVOLTAIC/THERMAL SOLAR COLLECTOR

    E-Print Network [OSTI]

    for Sustainable Energy Systems, Australian National University, Canberra, 0200, Australia +612 6125 3976, +612 increased solar energy conversion and potential cost benefits (Fujisawa and Tani, 1997, 2001, Huang et alPERFORMANCE OF A CONCENTRATING PHOTOVOLTAIC/THERMAL SOLAR COLLECTOR Joe S Coventry Centre

  4. Standard Test Method for Determining Thermal Performance of Tracking Concentrating Solar Collectors

    E-Print Network [OSTI]

    American Society for Testing and Materials. Philadelphia

    1987-01-01T23:59:59.000Z

    1.1 This test method covers the determination of thermal performance of tracking concentrating solar collectors that heat fluids for use in thermal systems. 1.2 This test method applies to one- or two-axis tracking reflecting concentrating collectors in which the fluid enters the collector through a single inlet and leaves the collector through a single outlet, and to those collectors where a single inlet and outlet can be effectively provided, such as into parallel inlets and outlets of multiple collector modules. 1.3 This test method is intended for those collectors whose design is such that the effects of diffuse irradiance on performance is negligible and whose performance can be characterized in terms of direct irradiance. Note 1—For purposes of clarification, this method shall apply to collectors with a geometric concentration ratio of seven or greater. 1.4 The collector may be tested either as a thermal collection subsystem where the effects of tracking errors have been essentially removed from t...

  5. Thermal and electrical performance of a concentrating PV/Thermal collector: results from the ANU CHAPS collector

    E-Print Network [OSTI]

    0506 E-mail: joe@faceng.anu.edu.au Abstract The combined heat and power solar (CHAPS) collector under The Combined Heat and Power Solar System, or CHAPS system being developed at the Australian National University prototype has been developed, a 35x concentration single-axis tracking system, designed for installation

  6. Intergrated function nonimaging concentrating collector tubes for solar thermal energy. Final technical report

    SciTech Connect (OSTI)

    Winston, R

    1982-09-01T23:59:59.000Z

    A substantial improvement in optical efficiency over contemporary external reflector evacuated tube collectors has been achieved by integrating the reflector surface into the outer glass envelope. Described are the design fabrication and test results for a prototype collector based on this concept. A comprehensive test program to measure performance and operational characteristics of a 2 m/sup 2/ panel (45 tubes) has been completed. Efficiencies above 50% relative to beam at 200/sup 0/C have been repeatedly demonstrated. Both the instantaneous and long term average performance of this totally stationary solar collector are comparable to those for tracking line focus parabolic troughs. The yield, reliability and stability of performance achieved have been excellent. Subcomponent assemblies and fabrication procedures have been used which are expected to be compatible with high volume production. The collector has a wide variety of applications in the 100/sup 0/C to 300/sup 0/C range including industrial process heat, air conditioning and Rankine engine operation.

  7. Simulation of a concentrating PV/thermal collector using TRNSYS J.S. Coventry

    E-Print Network [OSTI]

    for Sustainable Energy Systems Australian National University Canberra 0200 ACT AUSTRALIA Telephone: +61 02 6125, in particular heating, cooling and domestic hot water applications (Solar Energy Laboratory, 2000). TRNSYS equations describing the temperature dependent energy flow between the collector and surroundings. The CHAPS

  8. Photovoltaic-thermal collectors

    DOE Patents [OSTI]

    Cox, III, Charles H. (Carlisle, MA)

    1984-04-24T23:59:59.000Z

    A photovoltaic-thermal solar cell including a semiconductor body having antireflective top and bottom surfaces and coated on each said surface with a patterned electrode covering less than 10% of the surface area. A thermal-absorbing surface is spaced apart from the bottom surface of the semiconductor and a heat-exchange fluid is passed between the bottom surface and the heat-absorbing surface.

  9. Scattering Solar Thermal Concentrators

    Broader source: Energy.gov [DOE]

    "This fact sheet describes a scattering solar thermal concentrators project awarded under the DOE's 2012 SunShot Concentrating Solar Power R&D award program. The team, led by the Pennsylvania State University, is working to demonstrate a new, scattering-based approach to concentrating sunlight that aims to improve the overall performance and reliability of the collector field. The research team aims to show that scattering solar thermal collectors are capable of achieving optical performance equal to state-of-the-art parabolic trough systems, but with the added benefits of immunity to wind-load tracking error, more efficient land use, and utilization of stationary receivers."

  10. Midtemperature Solar Systems Test Facility Program for predicting thermal performance of line-focusing, concentrating solar collectors

    SciTech Connect (OSTI)

    Harrison, T.D.

    1980-11-01T23:59:59.000Z

    The program at Sandia National Laboratories, Albuquerque, for predicting the performance of line-focusing solar collectors in industrial process heat applications is described. The qualifications of the laboratories selected to do the testing and the procedure for selecting commercial collectors for testing are given. The testing program is outlined. The computer program for performance predictions is described. An error estimate for the predictions and a sample of outputs from the program are included.

  11. Cogenerating Photovoltaic and Thermal Solar Collector

    E-Print Network [OSTI]

    Su, Xiao

    · Solar Energy and Alternative Energy can contribute to the energy supply ­ Renewable, doesn't emitCogenerating Photovoltaic and Thermal Solar Collector Jinny Rhee and Jim Mokri COE Faculty Development Grant 9/26, 2008 #12;Motivation · Many Contemporary Applications use power and heat ­ Power

  12. Liquid photovoltaic/thermal collectors for residential applications

    SciTech Connect (OSTI)

    Hendrie, S. D.; Raghuraman, P.; Cox, C. H.

    1981-01-01T23:59:59.000Z

    A second-generation, liquid photovoltaic/thermal collector has been designed and is currently under fabrication. Results of computer simulations indicate that the collector unit, which incorporates novel cell and framing concepts, yields significnatly improved performance results over earlier units tested. Predicted performance values of 55% thermal efficiency and 11% electrical efficiency make the performance and this collector competitive with its single-function solar thermal and photovoltaic counterparts.

  13. Standard Practice for Generating All-Day Thermal Performance Data for Solar Collectors

    E-Print Network [OSTI]

    American Society for Testing and Materials. Philadelphia

    1987-01-01T23:59:59.000Z

    1.1 This practice covers a means of generating all-day thermal performance data for flat-plate collectors, concentrating collectors, and tracking collectors. 1.2 The values stated in SI units are to be regarded as the standard. The values given in the parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

  14. Thermal efficiency of single-pass solar air collector

    SciTech Connect (OSTI)

    Ibrahim, Zamry; Ibarahim, Zahari; Yatim, Baharudin [School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan (Malaysia); Ruslan, Mohd Hafidz [Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan (Malaysia)

    2013-11-27T23:59:59.000Z

    Efficiency of a finned single-pass solar air collector was studied. This paper presents the experimental study to investigate the effect of solar radiation and mass flow rate on efficiency. The fins attached at the back of absorbing plate to improve the thermal efficiency of the system. The results show that the efficiency is increased proportional to solar radiation and mass flow rate. Efficiency of the collector archived steady state when reach to certain value or can be said the maximum performance.

  15. Standard Practice for Evaluating Thermal Insulation Materials for Use in Solar Collectors

    E-Print Network [OSTI]

    American Society for Testing and Materials. Philadelphia

    1994-01-01T23:59:59.000Z

    1.1 This practice sets forth a testing methodology for evaluating the properties of thermal insulation materials to be used in solar collectors with concentration ratios of less than 10. Tests are given herein to evaluate the pH, surface burning characteristics, moisture adsorption, water absorption, thermal resistance, linear shrinkage (or expansion), hot surface performance, and accelerated aging. This practice provides a test for surface burning characteristics but does not provide a methodology for determining combustibility performance of thermal insulation materials. 1.2 The tests shall apply to blanket, rigid board, loose-fill, and foam thermal insulation materials used in solar collectors. Other thermal insulation materials shall be tested in accordance with the provisions set forth herein and should not be excluded from consideration. 1.3 The assumption is made that elevated temperature, moisture, and applied stresses are the primary factors contributing to the degradation of thermal insulation mat...

  16. Genetic algorithms used for the optimization of light-emitting diodes and solar thermal collectors

    E-Print Network [OSTI]

    Mayer, Alexandre

    Genetic algorithms used for the optimization of light-emitting diodes and solar thermal collectors developed for the optimization of light-emitting diodes (LED) and solar thermal collectors. The surface a light-extraction efficiency of only 3.7%). The solar thermal collector we considered consists

  17. Scattering Solar Thermal Concentrators

    Broader source: Energy.gov (indexed) [DOE]

    eere.energy.gov * energy.govsunshot DOEGO-102012-3669 * September 2012 MOTIVATION All thermal concentrating solar power (CSP) systems use solar tracking, which involves moving...

  18. A prototype photovoltaic/thermal system integrated with transpired collector

    SciTech Connect (OSTI)

    Athienitis, Andreas K.; Bambara, James; O'Neill, Brendan; Faille, Jonathan [Dept. of Building, Civil and Environmental Engineering, Concordia University, 1455 Maisonneuve W., Montreal, Quebec (Canada)

    2011-01-15T23:59:59.000Z

    Building-integrated photovoltaic/thermal (BIPV/T) systems may be utilized to produce useful heat while simultaneously generating electricity from the same building envelope surface. A well known highly efficient collector is the open-loop unglazed transpired collector (UTC) which consists of dark porous cladding through which outdoor air is drawn and heated by absorbed solar radiation. Commercially available photovoltaic systems typically produce electricity with efficiencies up to about 18%. Thus, it is beneficial to obtain much of the normally wasted heat from the systems, possibly by combining UTC with photovoltaics. Combination of BIPV/T and UTC systems for building facades is considered in this paper - specifically, the design of a prototype facade-integrated photovoltaic/thermal system with transpired collector (BIPV/T). A full scale prototype is constructed with 70% of UTC area covered with PV modules specially designed to enhance heat recovery and compared to a UTC of the same area under outdoor sunny conditions with low wind. The orientation of the corrugations in the UTC is horizontal and the black-framed modules are attached so as to facilitate flow into the UTC plenum. While the overall combined thermal efficiency of the UTC is higher than that of the BIPV/T system, the value of the generated energy - assuming that electricity is at least four times more valuable than heat - is between 7% and 17% higher. Also, the electricity is always useful while the heat is usually utilized only in the heating season. The BIPV/T concept is applied to a full scale office building demonstration project in Montreal, Canada. The ratio of photovoltaic area coverage of the UTC may be selected based on the fresh air heating needs of the building, the value of the electricity generated and the available building surfaces. (author)

  19. Concentrating-collector mass-production feasibility. Volume I. Final report

    SciTech Connect (OSTI)

    Not Available

    1981-11-02T23:59:59.000Z

    The Performance Prototype Trough (PPT) Concentrating Collector consists of four 80-foot modules in a 320-foot row. The collector was analyzed, including cost estimates and manufacturing processes to produce collectors in volumes from 100 to 100,000 modules per year. The four different reflector concepts considered were the sandwich reflector structure, sheet metal reflector structure, molded reflector structure, and glass laminate structure. The sheet metal and glass laminate structures are emphasized with their related structure concepts. A preliminary manufacturing plan is offered that includes: documentation of the manufacturing process with production flow diagrams; labor and material costs at various production levels; machinery and equipment requirements including preliminary design specifications; and capital investment costs for a new plant. Of five reflector designs considered, the two judged best and considered at length are thin annealed glass and steel laminate on steel frame panel and thermally sagged glass. Also discussed are market considerations, costing and selling price estimates, design cost analysis and make/buy analysis. (LEW)

  20. Self-Cleaning CSP Collectors, Concentrating Solar Power (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2012-09-01T23:59:59.000Z

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

  1. Experimental test of a facetted, non-imaging solar concentrating collector

    SciTech Connect (OSTI)

    Lopez, A.M.; Ortabasi, U.; Atienza, J.A.; Oezakcay, L.M.

    1980-01-01T23:59:59.000Z

    Preliminary tests of an experimental collector designed to produce process heat up to 300/sup 0/C are reported. The collector is a modular nonimaging trough concentrator (5.25X) whose mirror surface consists of planar facets sealed inside low cost glass tubes. The absorber is a cylindrical fin inside an evacuated glass tube. The behavior of the absorber tube independent of the concentrator was studied. Time constants of 1 to 4 minutes were measured at different flow rates. By measuring the optical efficiency of the absorber, its ..cap alpha..tau product was determine as 0.80. A transient behavior test was used to measure the collector overall heat loss coefficient throughout a wide range of temperatures. Preliminary measurements of the collector optical efficiency were carried out and are compared to theoretical predictions.

  2. 3X compound parabolic concentrating (CPC) solar energy collector. Final technical report

    SciTech Connect (OSTI)

    Ballheim, R.W.

    1980-04-25T23:59:59.000Z

    Chamberlain engineers designed a 3X compound parabolic concentrating (CPC) collector for the subject contract. The collector is a completely housed, 105.75 x 44.75 x 10.23-inch, 240-pound unit with six each evacuated receiver assemblies, a center manifold and a one-piece glass cover. A truncated version of a CPC trough reflector system and the General Electric Company tubular evacuated receiver have been integrated with a mass producible collector design suitable for operation at 250 to 450/sup 0/F. The key criterion for optimization of the design was minimization of the cost per Btu collected annually at an operating temperature of 400/sup 0/F. The reflector is a 4.1X design truncated to a total height of 8.0 inches with a resulting actual concentration ratio of 2.6 to 1. The manifold is an insulated area housing the fluid lines which connect the six receivers in series with inlet and outlet tubes extending from one side of the collector at the center. The reflectors are polished, anodized aluminum which are shaped by the roll form process. The housing is painted, galvanized steel, and the cover glass is 3/16-inch thick tempered, low iron glass. The collector requires four slope adjustments per year for optimum effectiveness. Chamberlain produced ten 3X CPC collectors for the subject contract. Two collectors were used to evaluate assembly procedures, six were sent to the project officer in Albuquerque, New Mexico, one was sent to Argonne National Laboratory for performance testing and one remained with the Company. A manufacturing cost study was conducted to estimate limited mass production costs, explore cost reduction ideas and define tooling requirements. The final effort discussed shows the preliminary design for application of a 3X CPC solar collector system for use in the Iowa State Capitol complex.

  3. Midtemperature solar systems test facility predictions for thermal performance of the Acurex solar collector with FEK 244 reflector surface

    SciTech Connect (OSTI)

    Harrison, T.D.

    1981-01-01T23:59:59.000Z

    Thermal performance predictions are presented for the Acurex solar collector, with FEK 244 reflector surface, for three output temperatures at five cities in the United States.

  4. Heat collector

    DOE Patents [OSTI]

    Merrigan, Michael A. (Santa Cruz, NM)

    1984-01-01T23:59:59.000Z

    A heat collector and method suitable for efficiently and cheaply collecting solar and other thermal energy are provided. The collector employs a heat pipe in a gravity-assist mode and is not evacuated. The collector has many advantages, some of which include ease of assembly, reduced structural stresses on the heat pipe enclosure, and a low total materials cost requirement. Natural convective forces drive the collector, which after startup operates entirely passively due in part to differences in molecular weights of gaseous components within the collector.

  5. Heat collector

    DOE Patents [OSTI]

    Merrigan, M.A.

    1981-06-29T23:59:59.000Z

    A heat collector and method suitable for efficiently and cheaply collecting solar and other thermal energy are provided. The collector employs a heat pipe in a gravity-assist mode and is not evacuated. The collector has many advantages, some of which include ease of assembly, reduced structural stresses on the heat pipe enclosure, and a low total materials cost requirement. Natural convective forces drive the collector, which after startup operates entirely passively due in part to differences in molecular weights of gaseous components within the collector.

  6. NREL: Concentrating Solar Power Research - Collector R&D

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Saleshttp://www.fnal.gov/directorate/nalcal/nalcal02_07_05_files/nalcal.gifNREL NRELChemical andWhat IsThermal Energy Storage

  7. Compendium of information on identification and testing of materials for plastic solar thermal collectors

    SciTech Connect (OSTI)

    McGinniss, V.D.; Sliemers, F.A.; Landstrom, D.K.; Talbert, S.G.

    1980-07-31T23:59:59.000Z

    This report is intended to organize and summarize prior and current literature concerning the weathering, aging, durability, degradation, and testing methodologies as applied to materials for plastic solar thermal collectors. Topics covered include (1) rate of aging of polymeric materials; (2) environmental factors affecting performance; (3) evaluation and prediction of service life; (4) measurement of physical and chemical properties; (5) discussion of evaluation techniques and specific instrumentation; (6) degradation reactions and mechanisms; (7) weathering of specific polymeric materials; and (8) exposure testing methodology. Major emphasis has been placed on defining the current state of the art in plastics degradation and on identifying information that can be utilized in applying appropriate and effective aging tests for use in projecting service life of plastic solar thermal collectors. This information will also be of value where polymeric components are utilized in the construction of conventional solar collectors or any application where plastic degradation and weathering are prime factors in material selection.

  8. Internal absorber solar collector

    DOE Patents [OSTI]

    Sletten, Carlyle J. (106 Nagog Hill Rd., Acton, MA 01720); Herskovitz, Sheldon B. (88 Hammond St., Acton, MA 01720); Holt, F. S. (46 Emerson Rd., Winchester, MA 01890); Sletten, E. J. (Chestnut Hill Rd. R.F.D. Rte. #4, Amherst, NH 03031)

    1981-01-01T23:59:59.000Z

    Thin solar collecting panels are described made from arrays of small rod collectors consisting of a refracting dielectric rod lens with an absorber imbedded within it and a reflecting mirror coated on the back side of the dielectric rod. Non-tracking collector panels on vertical walls or roof tops receive approximately 90% of solar radiation within an acceptance zone 60.degree. in elevation angle by 120.degree. or more in the azimuth sectors with a collector concentration ratio of approximately 3.0. Miniaturized construction of the circular dielectric rods with internal absorbers reduces the weight per area of glass, plastic and metal used in the collector panels. No external parts or insulation are needed as heat losses are low due to partial vacuum or low conductivity gas surrounding heated portions of the collector. The miniature internal absorbers are generally made of solid copper with black selective surface and the collected solar heat is extracted at the collector ends by thermal conductivity along the absorber rods. Heat is removed from end fittings by use of liquid circulants. Several alternate constructions are provided for simplifying collector panel fabrication and for preventing the thermal expansion and contraction of the heated absorber or circulant tubes from damaging vacuum seals. In a modified version of the internal absorber collector, oil with temperature dependent viscosity is pumped through a segmented absorber which is now composed of closely spaced insulated metal tubes. In this way the circulant is automatically diverted through heated portions of the absorber giving higher collector concentration ratios than theoretically possible for an unsegmented absorber.

  9. Title COMBINATION OF THERMAL SOLAR COLLECTORS, HEAT PUMP AND THERMAL ENERGY STORAGE FOR DWELLINGS IN BELGIUM.

    E-Print Network [OSTI]

    Contact Raf; De Herdt; Roel De Coninck; Filip Van Den Schoor; Lieve Helsen

    The amount of available solar energy in Belgium is more than sufficient to meet local heat demand for space heating and domestic hot water in a dwelling. However, the timing of both the availability of solar energy and the need for thermal energy, match only to a limited extent. Therefore, compact storage of the surplus of thermal energy is a critical issue. Depending on the temperature at which this energy is available, directly from the sun or indirectly through the storage, different combinations with a heat pump can be considered. By combining solar energy with a heat pump one may benefit on both sides since the fraction of solar energy increases as well as the performance of the heat pump. The aim of this thesis is to select the best out of three configurations that combine thermal solar collectors, heat pump and thermal energy storage for heating purposes in dwellings in Belgium, based on model simulations. Energetic, exergetic and economic criteria are used to evaluate the different configurations, while thermal comfort and domestic hot water tap profiles should be met. One (or more) performance index (indices) is (are) defined enabling an objective comparison between different systems. Today several systems are already commercially available on the international market [4]. Since these systems consist of different components, the system design is a crucial issue. Therefore, special attention should be paid to the sizing of the individual components, the interaction of the components within the global system, and the strategy for operational control. To study the interaction with the building, three types of buildings (already defined in a previous project) are considered.

  10. Midtemperature solar systems test facility predictions for thermal performance based on test data: Sun-Heet nontracking solar collector

    SciTech Connect (OSTI)

    Harrison, T.D.

    1981-03-01T23:59:59.000Z

    Sandia National Laboratories, Albuquerque (SNLA), is currently conducting a program to predict the performance and measure the characteristics of commercially available solar collectors that have the potential for use in industrial process heat and enhanced oil recovery applications. The thermal performance predictions for the Sun-Heet nontracking, line-focusing parabolic trough collector at five cities in the US are presented. (WHK)

  11. Unglazed transpired solar collector having a low thermal-conductance absorber

    DOE Patents [OSTI]

    Christensen, Craig B. (Boulder, CO); Kutscher, Charles F. (Golden, CO); Gawlik, Keith M. (Boulder, CO)

    1997-01-01T23:59:59.000Z

    An unglazed transpired solar collector using solar radiation to heat incoming air for distribution, comprising an unglazed absorber formed of low thermal-conductance material having a front surface for receiving the solar radiation and openings in the unglazed absorber for passage of the incoming air such that the incoming air is heated as it passes towards the front surface of the absorber and the heated air passes through the openings in the absorber for distribution.

  12. Unglazed transpired solar collector having a low thermal-conductance absorber

    DOE Patents [OSTI]

    Christensen, C.B.; Kutscher, C.F.; Gawlik, K.M.

    1997-12-02T23:59:59.000Z

    An unglazed transpired solar collector using solar radiation to heat incoming air for distribution, comprises an unglazed absorber formed of low thermal-conductance material having a front surface for receiving the solar radiation and openings in the unglazed absorber for passage of the incoming air such that the incoming air is heated as it passes towards the front surface of the absorber and the heated air passes through the openings in the absorber for distribution. 3 figs.

  13. Concentrating Solar Program; Session: Thermal Storage - Overview (Presentation)

    SciTech Connect (OSTI)

    Glatzmaier, G.; Mehos, M.; Mancini, T.

    2008-04-01T23:59:59.000Z

    The project overview of this presentation is: (1) description--(a) laboratory R and D in advanced heat transfer fluids (HTF) and thermal storage systems; (b) FOA activities in solar collector and component development for use of molten salt as a heat transfer and storage fluid; (c) applications for all activities include line focus and point focus solar concentrating technologies; (2) Major FY08 Activities--(a) advanced HTF development with novel molten salt compositions with low freezing temperatures, nanofluids molecular modeling and experimental studies, and use with molten salt HTF in solar collector field; (b) thermal storage systems--cost analysis and updates for 2-tank and thermocline storage and model development and analysis to support near-term trought deployment; (c) thermal storage components--facility upgrade to support molten salt component testing for freeze-thaw receiver testing, long-shafted molten salt pump for parabolic trough and power tower thermal storage systems; (d) CSP FOA support--testing and evaluation support for molten salt component and field testing work, advanced fluids and storage solicitation preparation, and proposal evaluation for new advanced HTF and thermal storage FOA.

  14. Concentrating solar collector system for the evaporation of low-level radioactive waste water

    SciTech Connect (OSTI)

    Diamond, S.C.; Cappiello, C.C.

    1981-01-01T23:59:59.000Z

    The Los Alamos National Laboratory has recently been awarded a grant under the Solar Federal Buildings Program to design, construct, and operate a high-temperature solar energy system for the processing of low-level radioactive waste water. Conceptual design studies have been completed, and detailed design work is under way for a solar system to produce process heat to evaporate 38,000 gal (143,830 L) of waste water per month. The system will use approximately 11,000 ft/sup 2/ (1022 m/sup 2/) of concentrating parabolic trough collectors operating at about 500/sup 0/F (262/sup 0/C). Construction of the system is anticipated to begin in 1981. Performance optimization of collector array size and configuration, storage medium and capacity, system operation, and control schemes are done using the active solar system simulator in the DOE-2 building energy analysis computer program. Results of this optimization are reported. This project represents a unique application of solar energy to an increasingly significant problem area in the energy field.

  15. Midtemperature Solar Systems Test Facility predictions for thermal performance of the Suntec solar collector with heat-formed glass reflector surface

    SciTech Connect (OSTI)

    Harrison, T.D.

    1980-11-01T23:59:59.000Z

    Thermal performance predictions are presented for the Suntec solar collector, with heat-formed glass reflector surface, for three output temperatures at five cities in the United States.

  16. A SOLAR TEST COLLECTOR FOR EVALUATION OF BOTH SELECTIVE AND NON-SELECTIVE ABSORBERS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2011-01-01T23:59:59.000Z

    Standards for Testing Solar Collectors and Thermal Storagethe Performance of Flat-Rate Solar Collectors" University ofstandards for testing solar collectors. l Collectors are

  17. Next-Generation Solar Collectors for CSP, Concentrating Solar Power (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2012-09-01T23:59:59.000Z

    3M Company is one of the 2012 SunShot CSP R&D awardees for their advanced collectors. This fact sheet explains the motivation, description, and impact of the project.

  18. Dynamic simulation of the thermal and electrical behavior of a thermionic converter coupled to a solar concentrator

    SciTech Connect (OSTI)

    Perez, G. [CUAP-UAP, Puebla (Mexico). Centro de Investigaciones en Dispositivos Semiconductores; Estrada, C.A.; Cervantes, J.G. [UNAM, Temixco, Morelos (Mexico). Solar Energy Research Lab.

    1995-12-31T23:59:59.000Z

    A mathematical simulation for the dynamic thermal and electrical behavior of a thermionic converter coupled to a solar concentrator, is presented. The thermionic device is a Cesium-filled thermionic diode operating in the ignited mode. The emitter of the device is made of polycrystalline Rhenium and the collector of the device of Molybdenum. The solar concentrator is a parabolic dish. The designed emitter and collector temperatures are 1,850 K and 928 K, respectively. However, due to changes in ambient conditions, the collector efficiency varies and so does the system efficiency. This fact makes it necessary to evaluate the design of the system not just for one hour with constant conditions but also for a whole operating day. The paper presents plots for the emitter and collector thermionic device temperatures and power and voltage for a constant resistance load as a function of time.

  19. Midtemperature solar systems test faclity predictions for thermal performance based on test data: Solar Kinetics T-700 solar collector with glass reflector surface

    SciTech Connect (OSTI)

    Harrison, T.D.

    1981-03-01T23:59:59.000Z

    Sandia National Laboratories, Albuquerque (SNLA), is currently conducting a program to predict the performance and measure the characteristics of commercially available solar collectors that have the potential for use in industrial process heat and enhanced oil recovery applications. The thermal performance predictions for the Solar Kinetics solar line-focusing parabolic trough collector for five cities in the US are presented. (WHK)

  20. Midtemperature solar systems test facility predictions for thermal performance based on test data: AAI solar collector with pressure-formed glass reflector surface

    SciTech Connect (OSTI)

    Harrison, T.D.

    1981-03-01T23:59:59.000Z

    Sandia National Laboratories, Albuquerque (SNLA), is currently conducting a program to predict the performance and measure the characteristics of commercially available solar collectors that have the potential for use in industrial process heat and enhance oil recovery applications. The thermal performance predictions for the AAI solar line-focusing slat-type collector for five cities in the US are presented. (WHK)

  1. Efficient solar cooling: first ever non-tracking solar collectors powering a double effect absorption chiller

    E-Print Network [OSTI]

    Poiry, Heather Marie

    2011-01-01T23:59:59.000Z

    R. (1980) “Solar collectors for low and intermediateSystem Using Double- glazed Collectors." Applied Thermal40: Heat loss in thermal watts from the collectors to the

  2. Phase Change Materials for Thermal Energy Storage in Concentrated Solar Thermal Power Plants

    E-Print Network [OSTI]

    Hardin, Corey Lee

    2011-01-01T23:59:59.000Z

    and Background Solar thermal energy collection is anCHANGE THERMAL ENERGY STORAGE FOR CONCENTRATING SOLAR POWERfor Thermal Energy Storage in Concentrated Solar Thermal

  3. Solar collector

    SciTech Connect (OSTI)

    Dostrovsky, I.

    1981-02-10T23:59:59.000Z

    A solar collector unit comprises a body of rigid thermally insulating material having a surface in the shape of about half a cylindrical parabola, the parabolic surface being provided with a reflective surface, a conduit being positioned with its long axis in the median plane of the parabola, said conduit serving as conduit for the heat-exchange medium, the surface of said conduit facing the parabolic surface being a selective surface, a transparent cover being provided on top of the device.

  4. Phase Change Materials for Thermal Energy Storage in Concentrated Solar Thermal Power Plants

    E-Print Network [OSTI]

    Hardin, Corey Lee

    2011-01-01T23:59:59.000Z

    PHASE CHANGE THERMAL ENERGY STORAGE FOR CONCENTRATING SOLARChange Materials for Thermal Energy Storage in ConcentratedChange Materials for Thermal Energy Storage in Concentrated

  5. SIMULATION OF THE THERMAL INTERACTION BETWEEN A BUILDING INTEGRATED PHOTOVOLTAIC COLLECTOR AND AN AIR-

    E-Print Network [OSTI]

    Boyer, Edmond

    AND AN AIR- SOURCE HEAT PUMP B. Filliard1 ; A. Guiavarch1 ; M. Jabbour1 . 1: MINES ParisTech ­ CEP ­ Centre simultaneously equipped with air-source heat pumps and photovoltaic collectors is constantly increasing of the heat pump is installed in the attic just beneath the PV collector, which preheats the incoming air

  6. Midtemperature solar systems test facility predictions for thermal performance based on test data. Toltec two-axis tracking solar collector with 3M acrylic polyester film reflector surface

    SciTech Connect (OSTI)

    Harrison, T.D.

    1981-06-01T23:59:59.000Z

    Thermal performance predictions based on test data are presented for the Toltec solar collector, with acrylic film reflector surface, for three output temperatures at five cities in the United States.

  7. Midtemperature Solar Systems Test Facility predictions for thermal performance of the Solar Kinetics T-700 solar collector with FEK 244 reflector surface

    SciTech Connect (OSTI)

    Harrison, T.D.

    1980-11-01T23:59:59.000Z

    Thermal performance predictions are presented for the Solar Kinetics T-700 solar collector, with FEK 244 reflector surface, for three output temperatures at five cities in the United States.

  8. Midtemperature solar systems test facility predictions for thermal performance based on test data. Polisolar Model POL solar collector with glass reflector surface

    SciTech Connect (OSTI)

    Harrison, T.D.

    1981-05-01T23:59:59.000Z

    Thermal performance predictions based on test data are presented for the Polisolar Model POL solar collector, with glass reflector surfaces, for three output temperatures at five cities in the United States.

  9. Theoretical analysis of reflected ray error from surface slope error and their application to the solar concentrated collector

    E-Print Network [OSTI]

    Huang, Weidong

    2011-01-01T23:59:59.000Z

    Surface slope error of concentrator is one of the main factors to influence the performance of the solar concentrated collectors which cause deviation of reflected ray and reduce the intercepted radiation. This paper presents the general equation to calculate the standard deviation of reflected ray error from slope error through geometry optics, applying the equation to calculate the standard deviation of reflected ray error for 5 kinds of solar concentrated reflector, provide typical results. The results indicate that the slope error is transferred to the reflected ray in more than 2 folds when the incidence angle is more than 0. The equation for reflected ray error is generally fit for all reflection surfaces, and can also be applied to control the error in designing an abaxial optical system.

  10. Theoretical analysis of error transfer from surface slope to refractive ray and their application to the solar concentrated collector

    E-Print Network [OSTI]

    Huang, Weidong

    2011-01-01T23:59:59.000Z

    This paper presents the general equation to calculate the standard deviation of reflected ray error from optical error through geometry optics, applying the equation to calculate the standard deviation of reflected ray error for 8 kinds of solar concentrated reflector, provide typical results. The results indicate that the slope errors in two direction is transferred to any one direction of the focus ray when the incidence angle is more than 0 for solar trough and heliostats reflector; for point focus Fresnel lens, point focus parabolic glass mirror, line focus parabolic galss mirror, the error transferring coefficient from optical to focus ray will increase when the rim angle increase; for TIR-R concentrator, it will decrease; for glass heliostat, it relates to the incidence angle and azimuth of the reflecting point. Keywords: optic error, standard deviation, refractive ray error, concentrated solar collector

  11. Analytical model and performance data for a cylindrical parabolic collector

    SciTech Connect (OSTI)

    Ford, F.M.; Stewart, W.E. Jr.

    1980-01-01T23:59:59.000Z

    Concentrating solar collectors provide higher fluid temperatures than flat-plate, an important advantage in many applications. The parabolic cylinder is one of the most popular types of concentrating collectors because of its relatively simple construction and tracking configuration. A mathematical model was developed for one such collector in order to predict thermal efficiency as a function of solar insolation. An experiment was then devised in an attempt to verify this model. Discrepancies between predicted and observed values are discussed, and suggestions are made for improving the model and the experimental procedure.

  12. A SOLAR TEST COLLECTOR FOR EVALUATION OF BOTH SELECTIVE AND NON-SELECTIVE ABSORBERS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2011-01-01T23:59:59.000Z

    SECTION A SOLAR TEST COLLECTOR FOR EVALUTATION OF BOTHStandards for Testing Solar Collectors and Thermal StorageSelective Coating Applied to Collector Design, Proceedings

  13. Scattering Solar Thermal Concentrators (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2012-09-01T23:59:59.000Z

    Pennsylvania State University is one of the 2012 SunShot CSP R&D awardee for their advanced collectors. This fact sheet explains the motivation, description, and impact of the project.

  14. Solar collector manufacturing activity 1993

    SciTech Connect (OSTI)

    Not Available

    1994-08-15T23:59:59.000Z

    The report presents national and State-level data on the U.S. solar thermal collector and photovoltaic cell and module manufacturing industry.

  15. Steam generation in line-focus solar collectors: a comparative assessment of thermal performance, operating stability, and cost issues

    SciTech Connect (OSTI)

    Murphy, L.M.; May, E.K.

    1982-04-01T23:59:59.000Z

    The engineering and system benefits of using direct steam (in situ) generation in line-focus collectors are assessed. The major emphasis of the analysis is a detailed thermal performance comparison of in situ systems (which utilize unfired boilers). The analysis model developed for this study is discussed in detail. An analysis of potential flow stability problems is also provided along with a cursory cost analysis and an assessment of freeze protection, safety, and control issues. Results indicated a significant thermal performance advantage over the more conventional oil and flash systems and the flow stability does not appear to be a significant problem. In particular, at steam temperatures of 220/sup 0/C (430/sup 0/F) under the chosen set of assumptions, annual delivered energy predictions indicate that the in situ system can deliver 15% more energy than an oil system and 12% more energy than a flash system, with all of the systems using the same collector field. Further, the in situ system may result in a 10% capital cost reduction. Other advantages include improvement in simpler control when compared with flash systems, and fluid handling and safety enhancement when compared with oil systems.

  16. Thermal regeneration of an electrochemical concentration cell

    DOE Patents [OSTI]

    Krumpelt, Michael (Naperville, IL); Bates, John K. (Plainfield, IL)

    1981-01-01T23:59:59.000Z

    A system and method for thermally regenerating an electrochemical concentration cell having first and second aluminum electrodes respectively positioned in contact with first and second electrolytes separated by an ion exchange member, the first and second electrolytes being composed of different concentrations of an ionic solvent and a salt, preferably an aluminum halide. The ionic solvent may be either organic or inorganic with a relatively low melting point, the ionic solvent and the salt form a complex wherein the free energy of formation of said complex is less than about -5 Kcal/mole. A distillation column using solar heat or low grade industrial waste heat receives the first and second electrolytes and thermally decomposes the salt-solvent complex to provide feed material for the two half cells.

  17. Thermal regeneration of an electrochemical concentration cell

    DOE Patents [OSTI]

    Krumpelt, M.; Bates, J.K.

    1980-05-09T23:59:59.000Z

    A system and method are described for thermally regenerating an electrochemical concentration cell having first and second aluminum electrodes respectively positioned in contact with first and second electrolytes separated by an ion exchange member, the first and second electrolytes being composed of different concentrations of an ionic solvent and a salt, preferably an aluminum halide. The ionic solvent may be either organic or inorganic with a relatively low melting point, the ionic solvent and the salt form a complex wherein the free energy of formation of said complex is less than about -5 kcal/mole. A distillation column using solar heat or low grade industrial waste heat receives the first and second electrolytes and thermally decomposes the salt-solvent complex to provide feed material for the two half cells.

  18. Phase Change Materials for Thermal Energy Storage in Concentrated Solar Thermal Power Plants

    E-Print Network [OSTI]

    Hardin, Corey Lee

    2011-01-01T23:59:59.000Z

    STORAGE FOR CONCENTRATING SOLAR POWER PLANTS,” Eurosun 2010,COST REDUCTION STUDY FOR SOLAR THERMAL POWER PLANTS, Ottawa,Storage in Concentrated Solar Thermal Power Plants A Thesis

  19. Phase Change Materials for Thermal Energy Storage in Concentrated Solar Thermal Power Plants

    E-Print Network [OSTI]

    Hardin, Corey Lee

    2011-01-01T23:59:59.000Z

    FOR CONCENTRATING SOLAR POWER PLANTS,” Eurosun 2010, Graz,STUDY FOR SOLAR THERMAL POWER PLANTS, Ottawa, Ontario: 1999.Concentrated Solar Thermal Power Plants A Thesis submitted

  20. Phase Change Materials for Thermal Energy Storage in Concentrated Solar Thermal Power Plants

    E-Print Network [OSTI]

    Hardin, Corey Lee

    2011-01-01T23:59:59.000Z

    UNIVERSITY OF CALIFORNIA RIVERSIDE Phase Change Materials for Thermal Energy Storage in Concentrated Solar

  1. Yearly average performance of the principal solar collector types

    SciTech Connect (OSTI)

    Rabl, A.

    1981-01-01T23:59:59.000Z

    The results of hour-by-hour simulations for 26 meteorological stations are used to derive universal correlations for the yearly total energy that can be delivered by the principal solar collector types: flat plate, evacuated tubes, CPC, single- and dual-axis tracking collectors, and central receiver. The correlations are first- and second-order polynomials in yearly average insolation, latitude, and threshold (= heat loss/optical efficiency). With these correlations, the yearly collectible energy can be found by multiplying the coordinates of a single graph by the collector parameters, which reproduces the results of hour-by-hour simulations with an accuracy (rms error) of 2% for flat plates and 2% to 4% for concentrators. This method can be applied to collectors that operate year-around in such a way that no collected energy is discarded, including photovoltaic systems, solar-augmented industrial process heat systems, and solar thermal power systems. The method is also recommended for rating collectors of different type or manufacturer by yearly average performance, evaluating the effects of collector degradation, the benefits of collector cleaning, and the gains from collector improvements (due to enhanced optical efficiency or decreased heat loss per absorber surface). For most of these applications, the method is accurate enough to replace a system simulation.

  2. Phase Change Materials for Thermal Energy Storage in Concentrated Solar Thermal Power Plants

    E-Print Network [OSTI]

    Hardin, Corey Lee

    2011-01-01T23:59:59.000Z

    COST REDUCTION STUDY FOR SOLAR THERMAL POWER PLANTS, Ottawa,Storage in Concentrated Solar Thermal Power Plants A ThesisStorage in Concentrated Solar Thermal Power Plants by Corey

  3. A SOLAR TEST COLLECTOR FOR EVALUATION OF BOTH SELECTIVE AND NON-SELECTIVE ABSORBERS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2011-01-01T23:59:59.000Z

    Coating Applied to Collector Design, Proceedings North American Solarsolar test collector was designed for the testing of thermally absorbing coatingssolar test collector was designed so that certain collector parameters could be held constant or controlled and yet different coatings

  4. Midtemperature Solar Systems Test Facility predictions for thermal performance based on test data. Alpha Solarco Model 104 solar collector with 0. 125-inch Schott low-iron glass reflector surface

    SciTech Connect (OSTI)

    Harrison, T.D.

    1981-04-01T23:59:59.000Z

    Thermal performance predictions based on test data are presented for the Alpha Solarco Model 104 solar collector, with 0.125-inch Schott low-iron glass reflector surface, for three output temperatures at five cities in the United States.

  5. An analytical model and performance data for a cylindrical parabolic collector

    SciTech Connect (OSTI)

    Ford, F.M.; Stewart, W.E.

    1980-12-01T23:59:59.000Z

    Concentrating solar collectors provide higher fluid temperatures than flat-plate, an important advantage in many applications. The parabolic cylinder is one of the most popular types of concentrating collectors because of its relatively simple construction and tracking configuration. A mathematical model was developed for one such collector in order to predict thermal efficiency as a function of solar insolation. An experiment was then devised in an attempt to verify this model. Discrepancies between predicted and observed values are discussed, and suggestions are made for improving the model and the experimental procedure.

  6. Project Profile: Low-Cost Solar Thermal Collector | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010 | DepartmentEnergyThermalDepartmentSunTrough

  7. Performance of a Thermally Stable Polyaromatic Hydrocarbon in a Simulated Concentrating Solar Power Loop

    SciTech Connect (OSTI)

    McFarlane, Joanna [ORNL] [ORNL; Bell, Jason R [ORNL] [ORNL; Felde, David K [ORNL] [ORNL; Joseph III, Robert Anthony [ORNL] [ORNL; Qualls, A L [ORNL] [ORNL; Weaver, Samuel P [ORNL] [ORNL

    2014-01-01T23:59:59.000Z

    Polyaromatic hydrocarbon thermal fluids showing thermally stability to 600 C have been tested for solar thermal-power applications. Although static thermal tests showed promising results for 1-phenylnaphthalene, loop testing at temperatures to 450 C indicated that the fluid isomerized and degraded at a slow rate. In a loop with a temperature high enough to drive the isomerization, the higher melting point byproducts tended to condense onto cooler surfaces. So, as experienced in loop operation, eventually the internal channels of cooler components in trough solar electric generating systems, such as the waste heat rejection exchanger, may become coated or clogged affecting loop performance. Thus, pure 1-phenylnaphthalene, without addition of stabilizers, does not appear to be a fluid that would have a sufficiently long lifetime (years to decades) to be used in a loop at the temperatures greater than 500 C. The performance of a concentrating solar loop using high temperature fluids was modeled based on the National Renewable Laboratory Solar Advisory Model. It was determined that a solar-to-electricity efficiency of up to 30% and a capacity factor of near 60% could be achieved using a high efficiency collector and 12 h thermal energy storage.

  8. Multi-collector Single-collector

    E-Print Network [OSTI]

    Mcdonough, William F.

    Multi-collector ICP-MS Single-collector ICP-MS 50 m Olivine Glass 50 m Epoxy Olivine Glass Opx Monitor Plates Electrostatic Analyzer Magnet Zoom Lens Collector Array Defining Slit Earth Guard Map Filter Electron Multiplier Nu Plasma Collector Schematic (not to scale) Collector Assembly 20 micron spot

  9. Distributed Energy Resources On-Site Optimization for Commercial Buildings with Electric and Thermal Storage Technologies

    E-Print Network [OSTI]

    Stadler, Michael

    2008-01-01T23:59:59.000Z

    photovoltaics and solar thermal collectors; electricalelectricity) solar thermal collector (kW) PV (kW) electricelectricity) solar thermal collector (kW) PV (kW) electric

  10. Solar collector

    DOE Patents [OSTI]

    Wilhelm, William G. (Cutchogue, NY)

    1982-01-01T23:59:59.000Z

    The field of this invention is solar collectors, and more particularly, the invention pertains to a flat plate collector that employs high performance thin films. The solar collector of this invention overcomes several problems in this field, such as excessive hardware, cost and reliability, and other prior art drawbacks outlined in the specification. In the preferred form, the apparatus features a substantially rigid planar frame (14). A thin film window (42) is bonded to one planar side of the frame. An absorber (24) of laminate construction is comprised of two thin film layers (24a, 24b) that are sealed perimetrically. The layers (24a, 24b) define a fluid-tight planar envelope (24c) of large surface area to volume through which a heat transfer fluid flows. Absorber (24) is bonded to the other planar side of the frame. The thin film construction of the absorber assures substantially full envelope wetting and thus good efficiency. The window and absorber films stress the frame adding to the overall strength of the collector.

  11. Desiccant cooling using unglazed transpired solar collectors

    SciTech Connect (OSTI)

    Pesaran, A.A. (National Renewable Energy Lab., Golden, CO (United States)); Wipke, K. (Stanford Univ., CA (United States))

    1992-05-01T23:59:59.000Z

    The use of unglazed solar collectors for desiccant regeneration in a solid desiccant cooling cycle was investigated because these collectors are lower in cost than conventional glazed flat-plate collectors. Using computer models, the performance of a desiccant cooling ventilation cycle integrated with either unglazed transpired collectors or conventional glazed flat-plate collectors was obtained. We found that the thermal performance of the unglazed system was lower than the thermal performance of the glazed system because the unglazed system could not take advantage of the heat of adsorption released during the dehumidification process. For a 3-ton cooling system, although the area required for the unglazed collector was 69% more than that required for the glazed collector, the cost of the unglazed collector array was 44% less than the cost of the glazed collector array. The simple payback period of the unglazed system was half of the payback period of the glazed collector when compared to an equivalent gas-fired system. Although the use of unglazed transpired collectors makes economic sense, some practical considerations may limit their use in desiccant regeneration. 8 refs.

  12. A SOLAR TEST COLLECTOR FOR EVALUATION OF BOTH SELECTIVE AND NON-SELECTIVE ABSORBERS

    E-Print Network [OSTI]

    Lampert, C.M.

    2011-01-01T23:59:59.000Z

    Standards for ~sting Solar Collectors and Thermal StorageLBL-6974 Rev. e. ' A SOLAR TEST COLLECTOR FOR EVALUATION OF+ 0.66 Fig. L r2 r2 Solar test collector flow chart. Type

  13. A SOLAR TEST COLLECTOR FOR EVALUATION OF BOTH SELECTIVE AND NON-SELECTIVE ABSORBERS

    E-Print Network [OSTI]

    Lampert, C.M.

    2011-01-01T23:59:59.000Z

    solar best collector was designed for the testing of thermally absorbing coatingssolar test collector was designed so that certain collector parameters could be held constant or controlled and yet different coatings

  14. Nontracking parabolic solar energy collector apparatus

    SciTech Connect (OSTI)

    Gill, M. T.; Rogers, M. C.

    1985-12-31T23:59:59.000Z

    A mirror collector having a generally parabolic surface terminating near the vertex in a circular or cylindrical curve, an evacuated cylindrical heat entrapment tube compossed of a clear glass for energy admission and two pair of elongated heat collector tubes centrally located in the heat entrapment tube for passing an inner fluid to be heated. The two pair of heat collector tubes are constructed of copper with a selective absorption coating for receiving heat and positioned so that the mirror collector concentrates substantially all incoming energy upon the central heat collector tubes.

  15. Thermal Conductivity Enhancement of High Temperature Phase Change Materials for Concentrating Solar Power Plant Applications

    E-Print Network [OSTI]

    Roshandell, Melina

    2013-01-01T23:59:59.000Z

    materials (PCM) in solar thermal concentrating technologyeffective and efficient solar thermal electricity generatorbeen considered for solar thermal energy storages. These are

  16. Optimisation of Concentrating Solar Thermal Power Plants with Neural Networks

    E-Print Network [OSTI]

    Ábrahám, Erika

    , Germany 2 Fraunhofer Institute for Solar Energy Systems, Freiburg, Germany Abstract. The exploitation of solar power for energy supply is of in- creasing importance. While technical development mainly takes, wind, and biomass energy. Among such tech- nologies, concentrating solar thermal power (CSP) plants

  17. Collector/Receiver Characterization (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2010-08-01T23:59:59.000Z

    Fact sheet describing NREL CSP Program capabilities for collector/receiver characterization: determining optical efficiency, measuring heat loss, developing and testing concentrators, concentrating the sun's power, and optically characterizing CSP plants.

  18. A new parabolic trough solar collector P. Kohlenbach1

    E-Print Network [OSTI]

    A new parabolic trough solar collector P. Kohlenbach1 , S. McEvoy1 , W. Stein1 , A. Burton1 , K) power generation system. The parabolic trough collectors have been installed in the National Solar and power generation (CHP), CSIRO has built a solar thermal parabolic trough collector field which

  19. Tubular solid oxide fuel cell current collector

    DOE Patents [OSTI]

    Bischoff, Brian L. (Knoxville, TN); Sutton, Theodore G. (Kingston, TN); Armstrong, Timothy R. (Clinton, TN)

    2010-07-20T23:59:59.000Z

    An internal current collector for use inside a tubular solid oxide fuel cell (TSOFC) electrode comprises a tubular coil spring disposed concentrically within a TSOFC electrode and in firm uniform tangential electrical contact with the electrode inner surface. The current collector maximizes the contact area between the current collector and the electrode. The current collector is made of a metal that is electrically conductive and able to survive under the operational conditions of the fuel cell, i.e., the cathode in air, and the anode in fuel such as hydrogen, CO, CO.sub.2, H.sub.2O or H.sub.2S.

  20. Thin film solar energy collector

    DOE Patents [OSTI]

    Aykan, Kamran (Monmouth Beach, NJ); Farrauto, Robert J. (Westfield, NJ); Jefferson, Clinton F. (Millburn, NJ); Lanam, Richard D. (Westfield, NJ)

    1983-11-22T23:59:59.000Z

    A multi-layer solar energy collector of improved stability comprising: (1) a substrate of quartz, silicate glass, stainless steel or aluminum-containing ferritic alloy; (2) a solar absorptive layer comprising silver, copper oxide, rhodium/rhodium oxide and 0-15% by weight of platinum; (3) an interlayer comprising silver or silver/platinum; and (4) an optional external anti-reflective coating, plus a method for preparing a thermally stable multi-layered solar collector, in which the absorptive layer is undercoated with a thin film of silver or silver/platinum to obtain an improved conductor-dielectric tandem.

  1. Research and Development of a Low Cost Solar Collector

    SciTech Connect (OSTI)

    Ansari, Asif; Philip, Lee; Thouppuarachchi, Chirath

    2012-08-01T23:59:59.000Z

    This is a Final Technical Report on the Research and Development completed towards the development of a Low Cost Solar Collector conducted under the DOE cost-sharing award EE-0003591. The objective of this project was to develop a new class of solar concentrators with geometries and manufacturability that could significantly reduce the fully installed cost of the solar collector field for concentrated solar thermal power plants. The goal of the project was to achieve an aggressive cost target of $170/m2, a reduction of up to 50% in the total installed cost of a solar collector field as measured against the current industry benchmark of a conventional parabolic trough. The project plan, and the detailed activities conducted under the scope of the DOE Award project addressed all major drivers that affect solar collector costs. In addition to costs, the study also focused on evaluating technical performance of new collector architectures and compared them to the performance of the industry benchmark parabolic trough. The most notable accomplishment of this DOE award was the delivery of a full-scale integrated design, manufacturing and field installation solution for a new class of solar collector architecture which has been classified as the Bi-Planar Fresnel Collector (BPFC) and may be considered as a viable alternative to the conventional parabolic trough, as well as the conventional Fresnel collectors. This was in part accomplished through the design and development, all the way through fabrication and test validation of a new class of Linear Planar Fresnel Collector architecture. This architecture offers a number of key differentiating features which include a planar light-weight frame geometry with small mass-manufacturable elements utilizing flat mirror sections. The designs shows significant promise in reducing the material costs, fabrication costs, shipping costs, and on-site field installation costs compared to the benchmark parabolic trough, as well as the conventional Fresnel collector. The noteworthy design features of the BPFC architecture include the use of relatively cheaper flat mirrors and a design which allows the mirror support beam sections to act as load-bearing structural elements resulting in more than a 36% reduction in the overall structural weight compared to an optimized parabolic trough. Also, it was shown that the utilization of small mass-produced elements significantly lowers mass-production and logistics costs that can more quickly deliver economies of scale, even for smaller installations while also reducing shipping and installation costs. Moreover, unlike the traditional Fresnel trough the BPFC architecture does not require complex articulating drive mechanisms but instead utilizes a standard parabolic trough hydraulic drive mechanism. In addition to the development of the Bi-Planar Fresnel Collector, an optimized conventional space-frame type parabolic trough was also designed, built, analyzed and field-tested during the first phase of this award. The design of the conventional space-frame parabolic collector was refined with extensive FEA and CFD analysis to reduce material costs and re-designed for simpler fabrication and more accurate lower-cost field assembly. This optimized parabolic trough represented an improvement over the state-of-the art of the traditional parabolic trough architecture and also served as a more rigorous and less subjective benchmark that was used for comparison of new candidate design architectures. The results of the expanded 1st phase of the DOE award project showed that both the Optimized Parabolic Trough and the new Bi-Planar Fresnel Collector design concepts failed to meet the primary objectives for the project of achieving a 50% cost reduction from the industry reference total installed cost of $350/m2. Results showed that the BPFC came in at projected total installed cost of $237/m2 representing a 32% savings compared to the industry benchmark conventional parabolic trough. And the cost reduction obtained by the Optimized Parabolic Trough compared to the

  2. Thermoelectrics Combined with Solar Concentration for Electrical and Thermal Cogeneration

    E-Print Network [OSTI]

    Jackson, Philip Robert

    2012-01-01T23:59:59.000Z

    significant challenge for solar thermal energy generation issolar thermal, cogeneration of electrical and thermal energy,for efficient energy production. Solar thermal plants, such

  3. The design of a pre-collector for cyclone collectors 

    E-Print Network [OSTI]

    Mihalski, Karl Duane

    1996-01-01T23:59:59.000Z

    Tests were conducted on small laboratory scale ID-3D and 2D-2D cyclones to demonstrate the reduction in emission concentrations resulting when a pre-cyclone collector is used to collect large trash particles prior to cyclone fine dust collection...

  4. The design of a pre-collector for cyclone collectors

    E-Print Network [OSTI]

    Mihalski, Karl Duane

    1996-01-01T23:59:59.000Z

    Tests were conducted on small laboratory scale ID-3D and 2D-2D cyclones to demonstrate the reduction in emission concentrations resulting when a pre-cyclone collector is used to collect large trash particles prior to cyclone fine dust collection...

  5. Value of Concentrating Solar Power and Thermal Energy Storage

    SciTech Connect (OSTI)

    Sioshansi, R.; Denholm, P.

    2010-02-01T23:59:59.000Z

    This paper examines the value of concentrating solar power (CSP) and thermal energy storage (TES) in four regions in the southwestern United States. Our analysis shows that TES can increase the value of CSP by allowing more thermal energy from a CSP plant?s solar field to be used, by allowing a CSP plant to accommodate a larger solar field, and by allowing CSP generation to be shifted to hours with higher energy prices. We analyze the sensitivity of CSP value to a number of factors, including the optimization period, price and solar forecasting, ancillary service sales, capacity value and dry cooling of the CSP plant. We also discuss the value of CSP plants and TES net of capital costs.

  6. Heat Pipe Performance Enhancement with Binary Mixture Fluids that Exhibit Strong Concentration Marangoni Effects

    E-Print Network [OSTI]

    Armijo, Kenneth Miguel

    2011-01-01T23:59:59.000Z

    68] Kalogirou, S. , 2004, “Solar thermal collectors andsilicon photovoltaic and thermal solar collector”, Solarevaluation of solar photovoltaic/thermal systems”, Solar

  7. Fraction Collector User Manual

    E-Print Network [OSTI]

    Pawlowski, Wojtek

    Fraction Collector Frac-950 18-1139-56 User Manual #12;#12;Important user information All users Territories Hong Kong © Copyright Amersham Biosciences AB 2002 - All rights reserved Fraction Collector Frac Fraction Collector Frac-950 User Manual 18-1139-56 Edition AE v Contents 1 Introduction 1.1 General

  8. Collector's problem Byron Schmuland

    E-Print Network [OSTI]

    Schmuland, Byron

    Collector's problem Byron Schmuland Department of Mathematical Sciences University of Alberta the mathematics of the collector's problem. For simplicity, let's assume that you buy cards one at a time, average doesn't mean typical. Some hockey card collectors will need to buy 1525 cards or so, but some

  9. Ultracapacitor current collector

    DOE Patents [OSTI]

    Jerabek, Elihu Calfin (Glenmont, NY); Mikkor, Mati (Ann Arbor, MI)

    2001-10-16T23:59:59.000Z

    An ultracapacitor having two solid, nonporous current collectors, two porous electrodes separating the collectors, a porous separator between the electrodes and an electrolyte occupying the pores in the electrodes and separator. At least one of the current collectors comprises a conductive metal substrate coated with a metal nitride, carbide or boride coating.

  10. Micro/Nano-Scale Phase Change Systems for Thermal Management and Solar Energy Conversion Applications

    E-Print Network [OSTI]

    Coso, Dusan

    2013-01-01T23:59:59.000Z

    focus only on the solar collector and catalytic converterfluid, a microfluidic solar collector, and a catalytic heatS. a. , 2004, “Solar Thermal Collectors and Applications,”

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

    E-Print Network [OSTI]

    Ho, Tony

    2012-01-01T23:59:59.000Z

    low and mid temperature solar collectors," Journal of SolarSA Kalogirou, "Solar thermal collectors and applications,"analysis of the solar collector system is presented. Results

  12. Thermoelectrics Combined with Solar Concentration for Electrical and Thermal Cogeneration

    E-Print Network [OSTI]

    Jackson, Philip Robert

    2012-01-01T23:59:59.000Z

    13 2.2.2. Solar Thermal Versus Photovoltaic ..…………..…………doi:10.1038/nmat2090. 17. Solar Thermal Technology on anFigure 2.5: An eSolar solar thermal system in Burbank,

  13. Thermoelectrics Combined with Solar Concentration for Electrical and Thermal Cogeneration

    E-Print Network [OSTI]

    Jackson, Philip Robert

    2012-01-01T23:59:59.000Z

    and Electrical Cogeneration ……………………. …………… 16 2.4.OptimalELECTRICAL AND THERMAL COGENERATION A thesis submitted inFOR ELECTRICAL AND THERMAL COGENERATION A solar tracker and

  14. Solar collector mounting and support apparatus

    SciTech Connect (OSTI)

    Hutchison, J.A.

    1981-12-22T23:59:59.000Z

    A solar collector system is described of the type having a movable surface for receiving solar radiation having improved means for rotatably supporting the movable surface and for rotating the collector surface. A support axle for the collector includes a ball at one end which is carried within a cylindrical sleeve in the solar collector to support the weight of the collector. A torque transmitting arm comprising a flexible flat strip is connected at one end to the axle and at the other end to the collector surface. An improved rotational drive mechanism includes a first sprocket wheel carried on the axle and a second sprocket wheel supported on a support pylon with a drive chain engaging both sprockets. A double acting piston also supported by the pylon is coupled to the chain so that the chain may be driven by a hydraulic control system to rotate the collector surfaces as required. An improved receiver tube support ring is also provided for use with the improved mounting and support apparatus to improve overall efficiency by reducing thermal losses.

  15. Cost goals for a residential photovoltaicthermal liquid collector system set in three northern locations

    E-Print Network [OSTI]

    Dinwoodie, Thomas L.

    1980-01-01T23:59:59.000Z

    This study compares the allowable costs for a residential PV/T liquid collector system with those of both PV-only and side-by-side PV and thermal collector systems. Four types of conventional energy systems provide backup: ...

  16. Next-Generation Solar Collectors for CSP

    Broader source: Energy.gov [DOE]

    This fact sheet on Next-Generation Collectors for CSP highlights a solar energy program awarded through the 2012 SunShot Concentrating Solar Power R&D awards. The team is developing new solar collector base technologies for next-generation heliostats used in power tower systems. If successful, this project will result in a 50% reduction in solar field equipment cost and a 30% reduction in field installation cost compared to existing heliostat designs.

  17. Thermoelectrics Combined with Solar Concentration for Electrical and Thermal Cogeneration

    E-Print Network [OSTI]

    Jackson, Philip Robert

    2012-01-01T23:59:59.000Z

    watts of thermal energy from the sun via the water coolingkilowatt-hours of energy from the sun per square mile perthe heat. The thermal energy from the sun is typically used

  18. Thermoelectrics Combined with Solar Concentration for Electrical and Thermal Cogeneration

    E-Print Network [OSTI]

    Jackson, Philip Robert

    2012-01-01T23:59:59.000Z

    steam turbine or sterling engine connected to an electricalsolar thermal systems, a sterling engine or steam turbine is

  19. Flexible thermal cycle test equipment for concentrator solar cells

    DOE Patents [OSTI]

    Hebert, Peter H. (Glendale, CA); Brandt, Randolph J. (Palmdale, CA)

    2012-06-19T23:59:59.000Z

    A system and method for performing thermal stress testing of photovoltaic solar cells is presented. The system and method allows rapid testing of photovoltaic solar cells under controllable thermal conditions. The system and method presents a means of rapidly applying thermal stresses to one or more photovoltaic solar cells in a consistent and repeatable manner.

  20. Polar axis solar collector

    SciTech Connect (OSTI)

    Ludlow, G.T.

    1994-01-04T23:59:59.000Z

    A polar column solar collector is described for use in association with a building, the system having a concave mirror located on the exterior of the building and defining a focal point and a central axis, a mounting column secured to the mirror coaxial therewith, a polar axis column, a hinge swingably connecting the mounting column to the polar axis column for moving the concave mirror to aim it directly at the sun at least over a predetermined period of the daylight hours, a secondary reflector located at the focal point of the concave mirror to receive the sun's rays reflected from the concave mirror, an opening in the concave mirror to receive a concentrated beam of the sun's rays reflected from the secondary reflector and to direct the beam along the mounting column, a third reflector movably located at the junction of the mounting column and the polar axis column to receive the concentrated beam of the sun's rays from the secondary reflector reflected through the opening, and to redirect it along the polar axis column, and a polar column rotator for rotating at least a portion of the polar column to track the movement of the sun. 7 figs.

  1. Self-Cleaning CSP Collectors

    Broader source: Energy.gov [DOE]

    This fact sheet details the efforts of a Boston University-led team which is working on a DOE SunShot Initative project. The concentrated solar power industry needs an automated, efficient cleaning process that requires neither water nor moving parts to keep the solar collectors clean for maximum reflectance and energy output. This project team is working to develop a transparent electrodynamic screen as a self-cleaning technology for solar concentrators; cleaning is achieved without water, moving parts, or manual labor. Because of these features, it has a strong potential for worldwide deployment.

  2. Project Profile: Novel Thermal Storage Technologies for Concentrating...

    Energy Savers [EERE]

    storage methods that would be applicable for large-scale implementation of thermal energy storage. The team aims to: Develop two methodologies with different designs and...

  3. Test results, Industrial Solar Technology parabolic trough solar collector

    SciTech Connect (OSTI)

    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

    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.

  4. A Linear Parabolic Trough Solar Collector Performance Model

    E-Print Network [OSTI]

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

    2006-01-01T23:59:59.000Z

    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...

  5. Solar energy collector

    SciTech Connect (OSTI)

    Bale, N.R.

    1983-11-22T23:59:59.000Z

    A solar energy collector is disclosed comprising a collector core located within a longitudinal parabolic reflector and formed of a series of spaced tubes exposed to the direct rays of the sun and to rays reflected by the reflector and arranged in a cylindrical array extending longitudinally to form a fluid path between two end annular manifolds connected at opposite ends of a storage tank located within the array.

  6. Efficient solar cooling: first ever non-tracking solar collectors powering a double effect absorption chiller

    E-Print Network [OSTI]

    Poiry, Heather Marie

    2011-01-01T23:59:59.000Z

    to buffer the incoming solar power to the glycol loop so asarea the available power to the solar thermal collector was

  7. subcollector Schottky collector contact & interconnect metals

    E-Print Network [OSTI]

    Rodwell, Mark J. W.

    base collector depletion layer subcollector ohmic metal (a) base collector depletion layer Schottky metal base emitter collector collector We emitter base emitter emitter We Wc Wc (b) Schottky collector contact & interconnect metals Emitter & collector Ohmics undoped collector depletion layer base N

  8. Novel Thermal Storage Technologies for Concentrating Solar Power Generation

    SciTech Connect (OSTI)

    Neti, Sudhakar; Oztekin, Alparslan; Chen, John; Tuzla, Kemal; Misiolek, Wojciech

    2013-06-20T23:59:59.000Z

    The technologies that are to be developed in this work will enable storage of thermal energy in 100 MWe solar energy plants for 6-24 hours at temperatures around 300oC and 850oC using encapsulated phase change materials (EPCM). Several encapsulated phase change materials have been identified, fabricated and proven with calorimetry. Two of these materials have been tested in an airflow experiment. A cost analysis for these thermal energy storage systems has also been conducted that met the targets established at the initiation of the project.

  9. Research and Development for Novel Thermal Energy Storage Systems (TES) for Concentrating Solar Power (CSP)

    SciTech Connect (OSTI)

    Faghri, Amir; Bergman, Theodore L; Pitchumani, Ranga

    2013-09-26T23:59:59.000Z

    The overall objective was to develop innovative heat transfer devices and methodologies for novel thermal energy storage systems for concentrating solar power generation involving phase change materials (PCMs). Specific objectives included embedding thermosyphons and/or heat pipes (TS/HPs) within appropriate phase change materials to significantly reduce thermal resistances within the thermal energy storage system of a large-scale concentrating solar power plant and, in turn, improve performance of the plant. Experimental, system level and detailed comprehensive modeling approaches were taken to investigate the effect of adding TS/HPs on the performance of latent heat thermal energy storage (LHTES) systems.

  10. Solar Thermal Powered Evaporators

    E-Print Network [OSTI]

    Moe, Christian Robert

    2015-01-01T23:59:59.000Z

    and C. Y. Zhao, "A review of solar collectors and thermalenergy storage in solar thermal applications," Appliedon photovoltaic/thermal hybrid solar technology," Applied

  11. Thermoelectrics Combined with Solar Concentration for Electrical and Thermal Cogeneration

    E-Print Network [OSTI]

    Jackson, Philip Robert

    2012-01-01T23:59:59.000Z

    a heat engine, such as a steam turbine or sterling enginethese concentrations, a steam turbine achieves roughly 25%ratio can run a steam turbine at 35-50% efficiency, with

  12. SELECTIVE ABSORBER COATED FOILS FOR SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2013-01-01T23:59:59.000Z

    fabrication of solar collector panels. adhesives and bondingdirectly to solar collector panels. the solar selectivefabrication of solar collector panels. However, the finish

  13. EVALUATION OF FLAT-PLATE PHOTOVOLTAIC THERMAL HYBRID SYSTEMS FOR SOLAR ENERGY UTILIZATION.

    SciTech Connect (OSTI)

    ANDREWS,J.W.

    1981-06-01T23:59:59.000Z

    The technical and economic attractiveness of combined photovoltaic/thermal (PV/T) solar energy collectors was evaluated. The study was limited to flat-plate collectors since concentrating photovoltaic collectors require active cooling and thus are inherently PV/T collectors, the only decision being whether to use the thermal energy or to dump it. it was also specified at the outset that reduction in required roof area was not to be used as an argument for combining the collection of thermal and electrical energy into one module. Three tests of economic viability were identified, all of which PV/T must pass if it is to be considered a promising alternative: PV/T must prove to be competitive with photovoltaic-only, thermal-only, and side-by-side photovoltaic-plus-thermal collectors and systems. These three tests were applied to systems using low-temperature (unglazed) collectors and to systems using medium-temperature (glazed) collectors in Los Angeles, New York, and Tampa. For photovoltaics, the 1986 DOE cost goals were assumed to have been realized, and for thermal energy collection two technologies were considered: a current technology based on metal and glass, and a future technology based on thin-film plastics. The study showed that for medium-temperature applications PV/T is not an attractive option in any of the locations studied. For low-temperature applications, PV/T appears to be marginally attractive.

  14. Tracking system for solar collectors

    DOE Patents [OSTI]

    Butler, Barry L. (Golden, CO)

    1984-01-01T23:59:59.000Z

    A tracking system is provided for pivotally mounted spaced-apart solar collectors. A pair of cables is connected to spaced-apart portions of each collector, and a driver displaces the cables, thereby causing the collectors to pivot about their mounting, so as to assume the desired orientation. The collectors may be of the cylindrical type as well as the flat-plate type. Rigid spar-like linkages may be substituted for the cables. Releasable attachments of the cables to the collectors is also described, as is a fine tuning mechanism for precisely aligning each individual collector.

  15. Tracking system for solar collectors

    DOE Patents [OSTI]

    Butler, B.

    1980-10-01T23:59:59.000Z

    A tracking system is provided for pivotally mounted spaced-apart solar collectors. A pair of cables is connected to spaced-apart portions of each collector, and a driver displaces the cables, thereby causing the collectors to pivot about their mounting, so as to assume the desired orientation. The collectors may be of the cylindrical type as well as the flat-plate type. Rigid spar-like linkages may be substituted for the cables. Releasable attachments of the cables to the collectors is also described, as is a fine tuning mechanism for precisely aligning each individual collector.

  16. Molten Salt Nanomaterials for Thermal Energy Storage and Concentrated Solar Power Applications

    E-Print Network [OSTI]

    Shin, Donghyun

    2012-10-19T23:59:59.000Z

    The thermal efficiency of concentrated solar power (CSP) system depends on the maximum operating temperature of the system which is determined by the operating temperature of the TES device. Organic materials (such as synthetic oil, fatty acid...

  17. Molten Salt Nanomaterials for Thermal Energy Storage and Concentrated Solar Power Applications 

    E-Print Network [OSTI]

    Shin, Donghyun

    2012-10-19T23:59:59.000Z

    The thermal efficiency of concentrated solar power (CSP) system depends on the maximum operating temperature of the system which is determined by the operating temperature of the TES device. Organic materials (such as synthetic oil, fatty acid...

  18. Thermal stress analysis of eccentric tube receiver using concentrated solar radiation

    SciTech Connect (OSTI)

    Wang, Fuqiang; Shuai, Yong; Yuan, Yuan; Yang, Guo; Tan, Heping [School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001 (China)

    2010-10-15T23:59:59.000Z

    In the parabolic trough concentrator with tube receiver system, the heat transfer fluid flowing through the tube receiver can induce high thermal stress and deflection. In this study, the eccentric tube receiver is introduced with the aim to reduce the thermal stresses of tube receiver. The ray-thermal-structural sequential coupled numerical analyses are adopted to obtain the concentrated heat flux distributions, temperature distributions and thermal stress fields of both the eccentric and concentric tube receivers. During the sequential coupled numerical analyses, the concentrated heat flux distribution on the bottom half periphery of tube receiver is obtained by Monte-Carlo ray tracing method, and the fitting function method is introduced for the calculated heat flux distribution transformation from the Monte-Carlo ray tracing model to the CFD analysis model. The temperature distributions and thermal stress fields are obtained by the CFD and FEA analyses, respectively. The effects of eccentricity and oriented angle variation on the thermal stresses of eccentric tube receiver are also investigated. It is recommended to adopt the eccentric tube receiver with optimum eccentricity and 90 oriented angle as tube receiver for the parabolic trough concentrator system to reduce the thermal stresses. (author)

  19. UBC Video Collection / Raymond J. Hall (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    UBC Video Collection / Raymond J. Hall (collector) Compiled by Christopher Hives (2011) University / Physical Description Collector's Biographical Sketch Custodial History Scope and Content Item List (collector). - 1992-2002. 30 video recordings. Collector's Biographical Sketch Raymond Hall came to Vancouver

  20. The Mechanized Verification of Garbage Collector Implementations

    E-Print Network [OSTI]

    Abstract The Mechanized Verification of Garbage Collector Implementations Andrew Evan Mc complex, requiring a garbage collector. Garbage collectors are becoming increasingly sophis- ticated to adapt them to high-performance, concurrent and real-time applications, making internal collector

  1. Kuali Financial System Implementation Collector Interface Meeting

    E-Print Network [OSTI]

    Stephens, Graeme L.

    Kuali Financial System Implementation Collector Interface Meeting December 17, 2008 Presenters of the Kuali Financial System (KFS) Collector Interface Format Differences from FRS Answer your questions #12 Collector File collector

  2. APEC Inquiry Collection (various collectors)

    E-Print Network [OSTI]

    Handy, Todd C.

    APEC Inquiry Collection (various collectors) Compiled by Jennifer Pecho (2008) University (various collectors). ­ 1997-2001. 6.45 m of textual records and other materials.. Background In 1997

  3. Burnett Collection / Frank Burnett (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Burnett Collection / Frank Burnett (collector) Last revised September 2010 University of British;Collection Description Burnett Collection / Frank Burnett (collector). ­ 1927-1944. 6.5 cm of textual records

  4. Electrochemically Stable Cathode Current Collectors for Rechargeable...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Stable Cathode Current Collectors for Rechargeable Magnesium Batteries . Electrochemically Stable Cathode Current Collectors for Rechargeable Magnesium Batteries . Abstract:...

  5. Parabolic trough solar collectors : design for increasing efficiency

    E-Print Network [OSTI]

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

    2011-01-01T23:59:59.000Z

    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 ...

  6. Concentrating Solar Power Thermal Storage System Basics | Department of

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the YouTube platformBuildingCoalComplex Flow Workshop ReportJungle |Energy Concentrating

  7. The Everyday Collector Cati Vaucelle

    E-Print Network [OSTI]

    Ishii, Hiroshi

    The Everyday Collector Cati Vaucelle Massachusetts Institute of Technology MIT Media Lab 20 Ames of the Everyday Collector as a bridge between the traditional physical collection and the growing digital one through analysis. The collector looks for cues in the world to witness a story or to make sense of one

  8. Review of solar thermoelectric energy conversion and analysis of a two cover flat-plate solar collector

    E-Print Network [OSTI]

    Hasan, Atiya

    2007-01-01T23:59:59.000Z

    The process of solar thermoelectric energy conversion was explored through a review of thermoelectric energy generation and solar collectors. Existing forms of flat plate collectors and solar concentrators were surveyed. ...

  9. Multiple discharge cylindrical pump collector

    DOE Patents [OSTI]

    Dunn, Charlton (Calabasas, CA); Bremner, Robert J. (Woodland Hills, CA); Meng, Sen Y. (Reseda, CA)

    1989-01-01T23:59:59.000Z

    A space-saving discharge collector 40 for the rotary pump 28 of a pool-type nuclear reactor 10. An annular collector 50 is located radially outboard for an impeller 44. The annular collector 50 as a closed outer periphery 52 for collecting the fluid from the impeller 44 and producing a uniform circumferential flow of the fluid. Turning means comprising a plurality of individual passageways 54 are located in an axial position relative to the annular collector 50 for receiving the fluid from the annular collector 50 and turning it into a substantially axial direction.

  10. Phase Change Materials for Thermal Energy Storage in Concentrated Solar Thermal Power Plants

    E-Print Network [OSTI]

    Hardin, Corey Lee

    2011-01-01T23:59:59.000Z

    demonstrated how well a molten salt thermal storage systembased CSP plant. Cold molten salt is pumped from a largetemperature and send to a hot molten salt tank. Salt is then

  11. COMPARISON OF PROPORTIONAL AND ON/OFF COLLECTOR LOOP CONTROL STRATEGIES USING A DYNAMIC COLLECTOR MODEL

    E-Print Network [OSTI]

    Schiller, Steven R.

    2013-01-01T23:59:59.000Z

    and Evacu- ated Tube Collectors. 11 Proceedings of 1977 ISEStemperature = ambient temp. collector capakitance d) lowday values qiven in (e) end (dl collector loss coefficient=

  12. The weighted words collector

    E-Print Network [OSTI]

    Boisberranger, Jérémie Du; Ponty, Yann

    2012-01-01T23:59:59.000Z

    Motivated by applications in bioinformatics, we consider the word collector problem, i.e. the expected number of calls to a random weighted generator of words of length $n$ before the full collection is obtained. The originality of this instance of the non-uniform coupon collector lies in the, potentially large, multiplicity of the words/coupons of a given probability/composition. We obtain a general theorem that gives an asymptotic equivalent for the expected waiting time of a general version of the Coupon Collector. This theorem is especially well-suited for classes of coupons featuring high multiplicities. Its application to a given language essentially necessitates some knowledge on the number of words of a given composition/probability. We illustrate the application of our theorem, in a step-by-step fashion, on three exemplary languages, revealing asymptotic regimes in $\\Theta(\\mu(n)\\cdot n)$ and $\\Theta(\\mu(n)\\cdot \\log n)$, where $\\mu(n)$ is the sum of weights over words of length $n$.

  13. Conductivity fuel cell collector plate and method of fabrication

    DOE Patents [OSTI]

    Braun, James C. (Juno Beach, FL)

    2002-01-01T23:59:59.000Z

    An improved method of manufacturing a PEM fuel cell collector plate is disclosed. During molding a highly conductive polymer composite is formed having a relatively high polymer concentration along its external surfaces. After molding the polymer rich layer is removed from the land areas by machining, grinding or similar process. This layer removal results in increased overall conductivity of the molded collector plate. The polymer rich surface remains in the collector plate channels, providing increased mechanical strength and other benefits to the channels. The improved method also permits greater mold cavity thickness providing a number of advantages during the molding process.

  14. Molten Salt-Carbon Nanotube Thermal Energy Storage for Concentrating Solar Power Systems Final Report

    SciTech Connect (OSTI)

    Michael Schuller; Frank Little; Darren Malik; Matt Betts; Qian Shao; Jun Luo; Wan Zhong; Sandhya Shankar; Ashwin Padmanaban

    2012-03-30T23:59:59.000Z

    We demonstrated that adding nanoparticles to a molten salt would increase its utility as a thermal energy storage medium for a concentrating solar power system. Specifically, we demonstrated that we could increase the specific heat of nitrate and carbonate salts containing 1% or less of alumina nanoparticles. We fabricated the composite materials using both evaporative and air drying methods. We tested several thermophysical properties of the composite materials, including the specific heat, thermal conductivity, latent heat, and melting point. We also assessed the stability of the composite material with repeated thermal cycling and the effects of adding the nanoparticles on the corrosion of stainless steel by the composite salt. Our results indicate that stable, repeatable 25-50% improvements in specific heat are possible for these materials. We found that using these composite salts as the thermal energy storage material for a concentrating solar thermal power system can reduce the levelized cost of electricity by 10-20%. We conclude that these materials are worth further development and inclusion in future concentrating solar power systems.

  15. Convection in nanofluids with a particle-concentration-dependent thermal conductivity

    E-Print Network [OSTI]

    Glässl, Martin; Zimmermann, Walter

    2010-01-01T23:59:59.000Z

    Thermal convection in nanofluids is investigated by means of a continuum model for binary-fluid mixtures, with a thermal conductivity depending on the local concentration of colloidal particles. The applied temperature difference between the upper and the lower boundary leads via the Soret effect to a variation of the colloid concentration and therefore to a spatially varying heat conductivity. An increasing difference between the heat conductivity of the mixture near the colder and the warmer boundary results in a shift of the onset of convection to higher values of the Rayleigh number for positive values of the separation ratio $\\psi>0$ and to smaller values in the range $\\psi0$. This range can be extended by increasing the difference in the thermal conductivity and it is bounded by two codimension-2 bifurcations.

  16. Convection in nanofluids with a particle-concentration-dependent thermal conductivity

    E-Print Network [OSTI]

    Martin Glässl; Markus Hilt; Walter Zimmermann

    2011-03-09T23:59:59.000Z

    Thermal convection in nanofluids is investigated by means of a continuum model for binary-fluid mixtures, with a thermal conductivity depending on the local concentration of colloidal particles. The applied temperature difference between the upper and the lower boundary leads via the Soret effect to a variation of the colloid concentration and therefore to a spatially varying heat conductivity. An increasing difference between the heat conductivity of the mixture near the colder and the warmer boundary results in a shift of the onset of convection to higher values of the Rayleigh number for positive values of the separation ratio psi>0 and to smaller values in the range psi0. This range can be extended by increasing the difference in the thermal conductivity and it is bounded by two codimension-2 bifurcations.

  17. Concentrating Electric and Thermal Fields Simultaneously Using Fan-shaped Structure

    E-Print Network [OSTI]

    Lan, Chuwen; Zhou, Ji

    2015-01-01T23:59:59.000Z

    Recently, considerable attention has been focused on the transformation optics and metamaterial due to their fascinating phenomena and potential applications. Concentrator is one of the most representative ones, which however is limited in single physical domain. Here we propose and give the experimental demonstration of bifunctional concentrator that can concentrate electric and thermal fields into a given region simultaneously while keeping the external fields undistorted. Fan-shaped structure composed of alternating wedges made of two kinds of natural materials is proposed to achieve this goal. The simulation and experimental results show good agreement, thereby confirming the feasibility of our scheme.

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

    E-Print Network [OSTI]

    Norwood, Zachary Mills

    2011-01-01T23:59:59.000Z

    with. Comparing tracking solar CHP systems to stationary PVratios of tracking collector solar CHP to stationary PV isprovided by a tracking concentrating solar collector, water

  19. Solar collector assembly

    SciTech Connect (OSTI)

    Bogatzki, H.

    1980-09-16T23:59:59.000Z

    Individual collector cells are fitted together in series along a heat transfer medium tube. The cells have a cylindrical housing with mating interconnecting flanges at the ends, through which the tube also passes. The flanges may have sealing gaskets. The housing has a transparent front side and a reflective back side. The cross-sectional configuration of the front is arcuate, while that of the back is parabolic. The cells are fixed with respect to the tube axis, but can rotate about it to follow the sun. Parallel cell rows can be interconnected to rotate together. Interconnected, articulated cell rows are disclosed as a removable cover for a swimming pool.

  20. SELECTIVE ABSORBER COATED FOILS FOR SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2013-01-01T23:59:59.000Z

    of 1977 Flat Plate Solar Collector Conference- USDOE," Wash.Second Coatings for Solar Collectors Symp. , 11 Winter Park,assuming the finisher and the collector manufacturer are not

  1. Labour Relations Research Collection / Mark Thompson (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Labour Relations Research Collection / Mark Thompson (collector) Compiled by Erwin Wodarczak (2004 catalogue) #12;Collection Description Labour Relations Research Collection / Mark Thompson (collector). ­ 1967-1996. 5.81 m of textual records. Collector's Biographical Sketch Mark Thompson received his

  2. SELECTIVE ABSORBER COATED FOILS FOR SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2013-01-01T23:59:59.000Z

    Proc. of 1977 Flat Plate Solar Collector Conference- USDOE,"Second Coatings for Solar Collectors Symp. , 11 Winter Park,COATED FOILS FOR SOLAR COLLECTORS Carl M. Lampert TWO-WEEK

  3. SELECTIVE ABSORBER COATED FOILS FOR SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2013-01-01T23:59:59.000Z

    p. 1080. AES Second Coatings for Solar Collectors Symp. , 11solar collector panels. Here the major consideration is whether the coatingcoating concept is to use heavy starting stock which might be suitable for direct fabrication of solar collector

  4. Concentrating solar collector with mechanical tracking apparatus

    SciTech Connect (OSTI)

    Brent, C.R.

    1980-08-19T23:59:59.000Z

    A hollow cylindrical tubing passing a coolant, a generally v shaped trough having at the apex thereof a mating semicylindrical surface for engaging said cylindrical tubing and the v-shaped trough disposed about 40/sup 0/ from each other or 20/sup 0/ angularly from a mid-plane of the trough. Linkage means are provided for moving the v-shaped trough through an angle that follows an east-to-west path of the sun and maximizing the collection of solar energy and programming means repetitively on a daily term for positioning said v-shaped trough to a start position commencing movement of said v-shaped trough from east-to-west following the sun and terminating said movement for subsequent positioning said v-shaped trough to said start position.

  5. Integrated solar collector

    DOE Patents [OSTI]

    Tchernev, Dimiter I. (9 Woodman Rd., Chestnut Hill, MA 02167)

    1985-01-01T23:59:59.000Z

    A solar collector having a copper panel in a contiguous space relationship with a condenser-evaporator heat exchanger located under the panel, the panel having a honeycomb-like structure on its interior defining individual cells which are filled with zeolite loaded, in its adsorbed condition, with 18 to 20% by weight of water. The interior of the panel and heat exchanger are maintained at subatmospheric pressure of about 0.1 to 1 psia. The panel and heat exchanger are insulated on their lateral sides and bottoms and on the top of the heat exchange. The panel has a black coating on its top which is exposed to and absorbs solar energy. Surrounding the insulation (which supports the panel) is an extruded aluminum framework which supports a pair of spaced-apart glass panels above the solar panel. Water in conduits from a system for heating or cooling or both is connected to flow into an inlet and discharge from outlet of a finned coil received within the heat exchanger. The collector panel provides heat during the day through desorption and condensing of water vapor from the heated solar panel in the heat exchanger and cools at night by the re-adsorption of the water vapor from the heat exchanger which lowers the absolute pressure within the system and cools the heat exchange coils by evaporation.

  6. International House Collection / William Black (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    International House Collection / William Black (collector) Revised by Erwin Wodarczak (2010 (collector). ­ 1950-1953. 45 p. of textual records. Biographical Sketch Born in London, England, William

  7. Faris Committee Collection / Gordon Selman (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Faris Committee Collection / Gordon Selman (collector) Compiled by Erwin Wodarczak (2004) Revised) #12;Collection Description Faris Committee Collection / Gordon Selman (collector). ­ March

  8. International House Collection / Stanley Read (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    International House Collection / Stanley Read (collector) Revised by Erwin Wodarczak (2010 (collector). - 1953-1955. 2 cm of textual records. Biographical Sketch Born in Quebec, Stanley Read earned

  9. Tensioning device for a stretched membrane collector

    DOE Patents [OSTI]

    Murphy, L.M.

    1984-01-01T23:59:59.000Z

    Disclosed is a solar concentrating collector comprising an elestic membrane member for concentrating sunlight, a frame for holding the membrane member in plane and in tension, and a tensioning means for varying the tension of the membrane member. The tensioning means is disposed at the frame and is adapted to releasably attach the membrane member thereto. The tensioning means is also adapted to uniformly and symmetrically subject the membrane member to stretching forces such that membrane stresses produced thereby are distributed uniformly over a thickness of the membrane member and reciprocal twisting moments are substantially prevented from acting about said frame.

  10. Standard test method for uranium and plutonium concentrations and isotopic abundances by thermal ionization mass spectrometry

    E-Print Network [OSTI]

    American Society for Testing and Materials. Philadelphia

    2005-01-01T23:59:59.000Z

    1.1 This test method covers the determination of the concentration and isotopic composition of uranium and plutonium in solutions. The purified uranium or plutonium from samples ranging from nuclear materials to environmental or bioassay matrices is loaded onto a mass spectrometric filament. The isotopic ratio is determined by thermal ionization mass spectrometry, the concentration is determined by isotope dilution. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish safety and health practices and determine the applicability of regulatory limitations prior to use.

  11. LHCb Tag Collector

    E-Print Network [OSTI]

    Fuente Fernàndez, P; Cousin, N

    2011-01-01T23:59:59.000Z

    The LHCb physics software consists of hundreds of packages, each of which is developed by one or more physicists. When the developers have some code changes that they would like released, they commit them to the version control system, and enter the revision number into a database. These changes have to be integrated into a new release of each of the physics analysis applications. Tests are then performed by a nightly build system, which rebuilds various configurations of the whole software stack and executes a suite of run-time functionality tests. A Tag Collector system has been developed using solid standard technologies to cover both the use cases of developers and integration managers. A simple Web interface, based on an AJAX-like technology, is available. Integration with software management and Nightly Build programs is possible via a Python API. Data are stored in a relational database with the help of an ORM (Object-Relational Mapping) library.

  12. Biobriefcase aerosol collector

    DOE Patents [OSTI]

    Bell, Perry M. (Tracy, CA); Christian, Allen T. (Madison, WI); Bailey, Christopher G. (Pleasanton, CA); Willis, Ladona (Manteca, CA); Masquelier, Donald A. (Tracy, CA); Nasarabadi, Shanavaz L. (Livermore, CA)

    2009-09-22T23:59:59.000Z

    A system for sampling air and collecting particles entrained in the air that potentially include bioagents. The system comprises providing a receiving surface, directing a liquid to the receiving surface and producing a liquid surface. Collecting samples of the air and directing the samples of air so that the samples of air with particles entrained in the air impact the liquid surface. The particles potentially including bioagents become captured in the liquid. The air with particles entrained in the air impacts the liquid surface with sufficient velocity to entrain the particles into the liquid but cause minor turbulence. The liquid surface has a surface tension and the collector samples the air and directs the air to the liquid surface so that the air with particles entrained in the air impacts the liquid surface with sufficient velocity to entrain the particles into the liquid, but cause minor turbulence on the surface resulting in insignificant evaporation of the liquid.

  13. Shenandoah parabolic dish solar collector

    SciTech Connect (OSTI)

    Kinoshita, G.S.

    1985-01-01T23:59:59.000Z

    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.

  14. Criminology Programme Collection / Elmer "Kim" Nelson (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Criminology Programme Collection / Elmer "Kim" Nelson (collector) Compiled by Erwin Wodarczak (2007 of Creation / Physical Description o Collector's Biographical Sketch o Scope and Content o Notes Catalogue" Nelson (collector). - 1952-2007. 3 cm of textual materials. 1 audio cassette. Collector's Biographical

  15. Watson Thomson Research Collection / Michael Welton (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Watson Thomson Research Collection / Michael Welton (collector) Compiled by Christopher Hives (2007 of Creation / Physical Description o Collector's Biographical Sketch o Scope and Content o Notes Item List / Michael Welton (collector). ­ 1981-1982. 19 audio recordings. Collector's Biographical Sketch Michael

  16. Sherwood Lett Collection / Reginald H. Roy (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Sherwood Lett Collection / Reginald H. Roy (collector) Compiled by Erwin Wodarczak (2012 of Creation / Physical Description o Collector's Biographical Sketch o Scope and Content o Notes Catalogue (collector). ­ 1964-1990. 3 cm of textual records. Collector's Biographical Sketch Reginald Roy was born

  17. UBC Subject File Collection / UBC Archives (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    UBC Subject File Collection / UBC Archives (collector) Compiled by Max Steiner (2005) Revised Description o Title / Dates of Creation / Physical Description o Collector's Biographical Sketch o Scope Files Collection / UBC Archives (collector). ­ 1915-2000. 10.8 m of textual materials. Collector

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

    E-Print Network [OSTI]

    Norwood, Zachary Mills

    2011-01-01T23:59:59.000Z

    12] Kalogirou, S. A. (2004). Solar thermal collectors andD. (2004). Advances in solar thermal electricity technology.December). Distributed solar-thermal/electric generation.

  19. Heat Pipe Performance Enhancement with Binary Mixture Fluids that Exhibit Strong Concentration Marangoni Effects

    E-Print Network [OSTI]

    Armijo, Kenneth Miguel

    2011-01-01T23:59:59.000Z

    of combined quantum/thermal solar energy converters”, Proc.of solar photovoltaic/thermal systems”, Solar Energy, 70 ,photovoltaic/thermal solar collector”, Solar Energy, 78 ,

  20. Radiant energy collector. [Patent application

    DOE Patents [OSTI]

    McIntire, W.R.

    1980-02-14T23:59:59.000Z

    A cylindrical radiant energy collector is provided which includes a reflector spaced apart from an energy absorber. The reflector is of a particular shape which ideally eliminates gap losses.

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    hal-00177601,version2-30Oct2007 A closed parabolic trough solar collector Gang Xiao 30th October of closed-box parabolic trough concentrated solar collector. By accepting an optical loss of a few 2007 Parabolic trough[1] is the most mature technology for large scale exploitation of solar energy

  2. SOLAR NANTENNA ELECTROMAGNETIC COLLECTORS

    SciTech Connect (OSTI)

    Steven D. Novack; Dale K. Kotter; Dennis Slafer; Patrick Pinhero

    2008-08-01T23:59:59.000Z

    This research explores a new efficient approach for producing electricity from the abundant energy of the sun. A nanoantenna electromagnetic collector (NEC) has been designed, prototyped, and tested. Proof of concept has been validated. The device targets mid-infrared wavelengths where conventional photovoltaic (PV) solar cells do not respond but is abundant in solar energy. The initial concept of designing NEC antennas was based on scaling of radio frequency antenna theory. This approach has proven unsuccessful by many due to not fully understanding and accounting for the optical behavior of materials in the THz region. Also until recent years the nanofabrication methods were not available to fabricate the optical antenna elements. We have addressed and overcome both technology barriers. Several factors were critical in successful implementation of NEC including: 1) frequency-dependent modeling of antenna elements, 2) selection of materials with proper THz properties and 3) novel manufacturing methods that enable economical large-scale manufacturing. The work represents an important step toward the ultimate realization of a low-cost device that will collect as well as convert this radiation into electricity, which will lead to a wide spectrum, high conversion efficiency, and low cost solution to complement conventional PVs.

  3. ADVANCED HYBRID PARTICULATE COLLECTOR

    SciTech Connect (OSTI)

    Stanley J. Miller; Grant L. Schelkoph; Grant E. Dunham

    2000-12-01T23:59:59.000Z

    A new concept in particulate control, called an advanced hybrid particulate collector (AHPC), is being developed under funding from the US Department of Energy. The AHPC combines the best features of electrostatic precipitators (ESPs) and baghouses in an entirely novel manner. The AHPC concept combines fabric filtration and electrostatic precipitation in the same housing, providing major synergism between the two methods, both in the particulate collection step and in transfer of dust to the hopper. The AHPC provides ultrahigh collection efficiency, overcoming the problem of excessive fine-particle emissions with conventional ESPs, and solves the problem of reentrainment and recollection of dust in conventional baghouses. Phase I of the development effort consisted of design, construction, and testing of a 5.7-m{sup 3}/min (200-acfm) working AHPC model. Results from both 8-hour parametric tests and 100-hour proof-of-concept tests with two different coals demonstrated excellent operability and greater than 99.99% fine-particle collection efficiency.

  4. Funding Opportunity Announcement: Concentrating Solar Power:...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    of the plant, including solar collectors, receivers and heat transfer fluids, thermal energy storage, power cycles, as well as operations and maintenance. The total federal...

  5. Simulating the Value of Concentrating Solar Power with Thermal Energy Storage in a Production Cost Model

    SciTech Connect (OSTI)

    Denholm, P.; Hummon, M.

    2012-11-01T23:59:59.000Z

    Concentrating solar power (CSP) deployed with thermal energy storage (TES) provides a dispatchable source of renewable energy. The value of CSP with TES, as with other potential generation resources, needs to be established using traditional utility planning tools. Production cost models, which simulate the operation of grid, are often used to estimate the operational value of different generation mixes. CSP with TES has historically had limited analysis in commercial production simulations. This document describes the implementation of CSP with TES in a commercial production cost model. It also describes the simulation of grid operations with CSP in a test system consisting of two balancing areas located primarily in Colorado.

  6. Heat Pipe Performance Enhancement with Binary Mixture Fluids that Exhibit Strong Concentration Marangoni Effects

    E-Print Network [OSTI]

    Armijo, Kenneth Miguel

    2011-01-01T23:59:59.000Z

    two-phase thermosyphon solar water heater”, Energy, 36 , pp.thermal hybrid solar collector water heater”, Proc. ISES

  7. Thermal Conductivity Enhancement of High Temperature Phase Change Materials for Concentrating Solar Power Plant Applications

    E-Print Network [OSTI]

    Roshandell, Melina

    2013-01-01T23:59:59.000Z

    Proceedings on thermal energy storage and energy conversion;polymer microcomposites for thermal energy storage. SAE SocLow temperature thermal energy storage: a state of the art

  8. Thermal Conductivity Enhancement of High Temperature Phase Change Materials for Concentrating Solar Power Plant Applications

    E-Print Network [OSTI]

    Roshandell, Melina

    2013-01-01T23:59:59.000Z

    been considered for solar thermal energy storages. These arePCMs for thermal energy storage in solar driven residentialfluid and thermal energy storage medium in the solar heat

  9. COMPARISON OF PROPORTIONAL AND ON/OFF SOLAR COLLECTOR LOOP CONTROL STRATEGIES USING A DYNAMIC COLLECTOR MODEL

    E-Print Network [OSTI]

    Schiller, Steven R.

    2013-01-01T23:59:59.000Z

    TABLE 1. SUMMARY OF COLLECTOR PARAMETERS AND SIMULATION RUNSFlat-Plate Solar Heat Collectors" Solar Energy Vol. 3, No.Plate and Evacuated Tube Collectors." Proceedings of 1977

  10. Novel Molten Salts Thermal Energy Storage for Concentrating Solar Power Generation

    SciTech Connect (OSTI)

    Reddy, Ramana G. [The University of Alabama] [The University of Alabama

    2013-10-23T23:59:59.000Z

    The explicit UA program objective is to develop low melting point (LMP) molten salt thermal energy storage media with high thermal energy storage density for sensible heat storage systems. The novel Low Melting Point (LMP) molten salts are targeted to have the following characteristics: 1. Lower melting point (MP) compared to current salts (<222ºC) 2. Higher energy density compared to current salts (>300 MJ/m3) 3. Lower power generation cost compared to current salt In terms of lower power costs, the program target the DOE's Solar Energy Technologies Program year 2020 goal to create systems that have the potential to reduce the cost of Thermal Energy Storage (TES) to less than $15/kWh-th and achieve round trip efficiencies greater than 93%. The project has completed the experimental investigations to determine the thermo-physical, long term thermal stability properties of the LMP molten salts and also corrosion studies of stainless steel in the candidate LMP molten salts. Heat transfer and fluid dynamics modeling have been conducted to identify heat transfer geometry and relative costs for TES systems that would utilize the primary LMP molten salt candidates. The project also proposes heat transfer geometry with relevant modifications to suit the usage of our molten salts as thermal energy storage and heat transfer fluids. The essential properties of the down-selected novel LMP molten salts to be considered for thermal storage in solar energy applications were experimentally determined, including melting point, heat capacity, thermal stability, density, viscosity, thermal conductivity, vapor pressure, and corrosion resistance of SS 316. The thermodynamic modeling was conducted to determine potential high temperature stable molten salt mixtures that have thermal stability up to 1000 °C. The thermo-physical properties of select potential high temperature stable (HMP) molten salt mixtures were also experimentally determined. All the salt mixtures align with the go/no-go goals stipulated by the DOE for this project. Energy densities of all salt mixtures were higher than that of the current solar salt. The salt mixtures costs have been estimated and TES system costs for a 2 tank, direct approach have been estimated for each of these materials. All estimated costs are significantly below the baseline system that used solar salt. These lower melt point salts offer significantly higher energy density per volume than solar salt – and therefore attractively smaller inventory and equipment costs. Moreover, a new TES system geometry has been recommended A variety of approaches were evaluated to use the low melting point molten salt. Two novel changes are recommended that 1) use the salt as a HTF through the solar trough field, and 2) use the salt to not only create steam but also to preheat the condensed feedwater for Rankine cycle. The two changes enable the powerblock to operate at 500°C, rather than the current 400°C obtainable using oil as the HTF. Secondly, the use of salt to preheat the feedwater eliminates the need to extract steam from the low pressure turbine for that purpose. Together, these changes result in a dramatic 63% reduction required for 6 hour salt inventory, a 72% reduction in storage volume, and a 24% reduction in steam flow rate in the power block. Round trip efficiency for the Case 5 - 2 tank “direct” system is estimated at >97%, with only small losses from time under storage and heat exchange, and meeting RFP goals. This attractive efficiency is available because the major heat loss experienced in a 2 tank “indirect” system - losses by transferring the thermal energy from oil HTF to the salt storage material and back to oil to run the steam generator at night - is not present for the 2 tank direct system. The higher heat capacity values for both LMP and HMP systems enable larger storage capacities for concentrating solar power.

  11. Tracking heat flux sensors for concentrating solar applications

    DOE Patents [OSTI]

    Andraka, Charles E; Diver, Jr., Richard B

    2013-06-11T23:59:59.000Z

    Innovative tracking heat flux sensors located at or near the solar collector's focus for centering the concentrated image on a receiver assembly. With flux sensors mounted near a receiver's aperture, the flux gradient near the focus of a dish or trough collector can be used to precisely position the focused solar flux on the receiver. The heat flux sensors comprise two closely-coupled thermocouple junctions with opposing electrical polarity that are separated by a thermal resistor. This arrangement creates an electrical signal proportional to heat flux intensity, and largely independent of temperature. The sensors are thermally grounded to allow a temperature difference to develop across the thermal resistor, and are cooled by a heat sink to maintain an acceptable operating temperature.

  12. Collector for thermionic energy converter

    SciTech Connect (OSTI)

    Bell, R.L.

    1981-07-21T23:59:59.000Z

    An improved collector is provided for a thermionic energy converter. The collector comprises a p-type layer of a semiconductor material formed on an n-type layer of a semiconductor material. The p-n junction is maintained in a forward biased condition. The electron affinity of the exposed surface of the p-type layer is effectively lowered to a low level near zero by the presence of a work function lowering activator. The dissipation of energy during collection is reduced by the passage of electrons through the p-type layer in the metastable conduction band state. A significant portion of the electron current remains at the potential of the fermi level of the n-type layer rather than dropping to the fermi level of the p-type layer. Less energy is therefore dissipated as heat and a higher net power output is delivered from a thermionic energy converter incorporating the collector.

  13. Photovoltaic concentrator technology development project. Sixth project integration meeting

    SciTech Connect (OSTI)

    None

    1980-10-01T23:59:59.000Z

    Thirty-three abstracts and short papers are presented which describe the current status of research, development, and demonstration of concentrator solar cell technology. Solar concentrators discussed include the parabolic trough, linear focus Fresnel lens, point focus Fresnel lens, and the parabolic dish. Solar cells studied include silicon, GaAs, and AlGaAs. Research on multiple junction cells, combined photovoltaic/thermal collectors, back contact solar cells, and beam splitter modules is described. Concentrator solar cell demonstration programs are reported. Contractor status summaries are given for 33 US DOE concentrator solar cell contracts; a description of the project, project status, and key results to date is included. (WHK)

  14. Connectable solar air collectors Solar Energy Centre Denmark

    E-Print Network [OSTI]

    Connectable solar air collectors Solar Energy Centre Denmark Danish Technological Institute SEC-R-22 #12;Connectable solar air collectors Søren Østergaard Jensen Miroslav Bosanac Solar Energy Centre within the project "Connectable solar air collector/PVT collector" (Sammenkoblelig luftsolfanger

  15. A Generalized Coupon Collector Problem

    E-Print Network [OSTI]

    Xu, Weiyu

    2010-01-01T23:59:59.000Z

    This paper provides analysis to a generalized version of the coupon collector problem, in which the collector gets $d$ distinct coupons each run and she chooses the one that she has the least so far. On the asymptotic case when the number of coupons $n$ goes to infinity, we show that on average $\\frac{n\\log n}{d} + \\frac{n}{d}(m-1)\\log\\log{n}+O(mn)$ runs are needed to collect $m$ sets of coupons. An efficient exact algorithm is also developed for any finite case to compute the average needed runs exactly. Numerical examples are provided to verify our theoretical predictions.

  16. SELECTIVE ABSORBER COATED FOILS FOR SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2013-01-01T23:59:59.000Z

    p. 1080. AES Second Coatings for Solar Collectors Symp. , 11coating concept is to use heavy starting stock which might be suitable for direct fabrication of solar collectorsolar collector panels. Here the major consideration is whether the coating

  17. Micro/Nano-Scale Phase Change Systems for Thermal Management and Solar Energy Conversion Applications

    E-Print Network [OSTI]

    Coso, Dusan

    2013-01-01T23:59:59.000Z

    S. a. , 2004, “Solar Thermal Collectors and Applications,”86] Schnatbaum L. , 2009, “Solar Thermal Power Plants,” Thefor Storage of Solar Thermal Energy,” Solar Energy, 18 (3),

  18. Distributed Energy Resources On-Site Optimization for Commercial Buildings with Electric and Thermal Storage Technologies

    E-Print Network [OSTI]

    Stadler, Michael

    2008-01-01T23:59:59.000Z

    photovoltaics and solar thermal collectors; electricalfor application of solar thermal and recovered heat to end-absorption chiller solar thermal photovoltaics Results

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

    SciTech Connect (OSTI)

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

    2008-05-01T23:59:59.000Z

    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.

  20. Canadian Unity Collection / Charles Connaghan (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Canadian Unity Collection / Charles Connaghan (collector) University of British Columbia Archives Collector's Biographical Sketch o Scope and Content o Notes Series Descriptions o Council for Canadian) #12;Collection Description Canadian Unity Collection. - 1975-1980 39 cm of textual records. Collector

  1. Lamb Research Collection / W. Kaye Lamb (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Lamb Research Collection / W. Kaye Lamb (collector) Compiled by Jane Turner (1990) Revised by Erwin Collection Description o Title / Dates of Creation / Physical Description o Collector's Biographical Sketch o Collection. - 1959-1991. 1.3 m of textual records. 90 maps and charts. 26 microfilm reels. Collector

  2. Day of Concern Collection / Ture Erickson (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Day of Concern Collection / Ture Erickson (collector) Last revised October 2011 University;Collection Description Day of Concern collection / Ture Erickson (collector). ­ 1984. 6.5 cm of textual records. Collector's Biographical Sketch Born in New Westminster, Ture Erickson became Head of Sedgewick

  3. University Extension Collection / Graham A. Drew (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    University Extension Collection / Graham A. Drew (collector) Last revised October 2010 University / Physical Description o Collector's Biographical Sketch o Scope and Content o Note File List Catalogue. Drew (collector). ­ 1959-1982. 40 cm of textual records. ca. 100 photographs; prints and slides

  4. UBC Performing Arts Collection / UBC Archives (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    UBC Performing Arts Collection / UBC Archives (collector) Compiled by Erwin Wodarczak (2011) Last Description o Title / Dates of Creation / Physical Description o Collector's Administrative History o;Collection Description UBC Performing Arts Collection / UBC Archives (collector). ­ 1936-2011. 24 cm

  5. Glass heat pipe evacuated tube solar collector

    DOE Patents [OSTI]

    McConnell, Robert D. (Lakewood, CO); Vansant, James H. (Tracy, CA)

    1984-01-01T23:59:59.000Z

    A glass heat pipe is adapted for use as a solar energy absorber in an evacuated tube solar collector and for transferring the absorbed solar energy to a working fluid medium or heat sink for storage or practical use. A capillary wick is formed of granular glass particles fused together by heat on the inside surface of the heat pipe with a water glass binder solution to enhance capillary drive distribution of the thermal transfer fluid in the heat pipe throughout the entire inside surface of the evaporator portion of the heat pipe. Selective coatings are used on the heat pipe surface to maximize solar absorption and minimize energy radiation, and the glass wick can alternatively be fabricated with granular particles of black glass or obsidian.

  6. Automated Verification of Practical Garbage Collectors

    E-Print Network [OSTI]

    Hawblitzel, Chris

    2010-01-01T23:59:59.000Z

    Garbage collectors are notoriously hard to verify, due to their low-level interaction with the underlying system and the general difficulty in reasoning about reachability in graphs. Several papers have presented verified collectors, but either the proofs were hand-written or the collectors were too simplistic to use on practical applications. In this work, we present two mechanically verified garbage collectors, both practical enough to use for real-world C# benchmarks. The collectors and their associated allocators consist of x86 assembly language instructions and macro instructions, annotated with preconditions, postconditions, invariants, and assertions. We used the Boogie verification generator and the Z3 automated theorem prover to verify this assembly language code mechanically. We provide measurements comparing the performance of the verified collector with that of the standard Bartok collectors on off-the-shelf C# benchmarks, demonstrating their competitiveness.

  7. Evaluation of solar collectors for heat pump applications. Final report

    SciTech Connect (OSTI)

    Skartvedt, Gary; Pedreyra, Donald; McMordle, Dr., Robert; Kidd, James; Anderson, Jerome; Jones, Richard

    1980-08-01T23:59:59.000Z

    The study was initiated to evaluate the potential utility of very low cost (possibly unglazed and uninsulated) solar collectors to serve as both heat collection and rejection devices for a liquid source heat pump. The approach consisted of exercising a detailed analytical simulation of the complete heat pump/solar collector/storage system against heating and cooling loads derived for typical single-family residences in eight US cities. The performance of each system was measured against that of a conventional air-to-air heat pump operating against the same loads. In addition to evaluation of solar collector options, the study included consideration of water tanks and buried pipe grids to provide thermal storage. As a supplement to the analytical tasks, the study included an experimental determination of night sky temperature and convective heat transfer coefficients for surfaces with dimensions typical of solar collectors. The experiments were conducted in situ by placing the test apparatus on the roofs of houses in the Denver, Colorado, area. (MHR)

  8. Concentrating Solar Power (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2010-08-01T23:59:59.000Z

    Fact sheet describing the overall capabilities of the NREL CSP Program: collector/receiver characterization, advanced reflector and absorber materials, thermal storage and advanced heat transfer fluids, and CSP modeling and analysis.

  9. Modelling Concentrating Solar Power with Thermal Energy Storage for Integration Studies: Preprint

    SciTech Connect (OSTI)

    Hummon, M.; Denholm, P.; Jorgenson, J.; Mehos, M.

    2013-10-01T23:59:59.000Z

    Concentrating solar power with thermal energy storage (CSP-TES) can provide multiple benefits to the grid, including low marginal cost energy and the ability to levelize load, provide operating reserves, and provide firm capacity. It is challenging to properly value the integration of CSP because of the complicated nature of this technology. Unlike completely dispatchable fossil sources, CSP is a limited energy resource, depending on the hourly and daily supply of solar energy. To optimize the use of this limited energy, CSP-TES must be implemented in a production cost model with multiple decision variables for the operation of the CSP-TES plant. We develop and implement a CSP-TES plant in a production cost model that accurately characterizes the three main components of the plant: solar field, storage tank, and power block. We show the effect of various modelling simplifications on the value of CSP, including: scheduled versus optimized dispatch from the storage tank and energy-only operation versus co-optimization with ancillary services.

  10. Modelling Concentrating Solar Power with Thermal Energy Storage for Integration Studies (Presentation)

    SciTech Connect (OSTI)

    Hummon, M.; Jorgenson, J.; Denholm, P.; Mehos, M.

    2013-10-01T23:59:59.000Z

    Concentrating solar power with thermal energy storage (CSP-TES) can provide multiple benefits to the grid, including low marginal cost energy and the ability to levelize load, provide operating reserves, and provide firm capacity. It is challenging to properly value the integration of CSP because of the complicated nature of this technology. Unlike completely dispatchable fossil sources, CSP is a limited energy resource, depending on the hourly and daily supply of solar energy. To optimize the use of this limited energy, CSP-TES must be implemented in a production cost model with multiple decision variables for the operation of the CSP-TES plant. We develop and implement a CSP-TES plant in a production cost model that accurately characterizes the three main components of the plant: solar field, storage tank, and power block. We show the effect of various modelling simplifications on the value of CSP, including: scheduled versus optimized dispatch from the storage tank and energy-only operation versus co-optimization with ancillary services.

  11. Thermal Conductivity Enhancement of High Temperature Phase Change Materials for Concentrating Solar Power Plant Applications

    E-Print Network [OSTI]

    Roshandell, Melina

    2013-01-01T23:59:59.000Z

    3 Fig. 1.2. Solar power plant operation [Materials for Concentrating Solar Power Plant Applications AMaterials for Concentrating Solar Power Plant Applications

  12. Thermal Conductivity Enhancement of High Temperature Phase Change Materials for Concentrating Solar Power Plant Applications

    E-Print Network [OSTI]

    Roshandell, Melina

    2013-01-01T23:59:59.000Z

    3 Fig. 1.2. Solar power plant operation [Materials for Concentrating Solar Power Plant Applications Afor Concentrating Solar Power Plant Applications by Melina

  13. Evaluation of annual efficiencies of high temperature central receiver concentrated solar power plants with thermal energy storage.

    SciTech Connect (OSTI)

    Ehrhart, Brian David; Gill, David Dennis

    2013-07-01T23:59:59.000Z

    The current study has examined four cases of a central receiver concentrated solar power plant with thermal energy storage using the DELSOL and SOLERGY computer codes. The current state-of-the-art base case was compared with a theoretical high temperature case which was based on the scaling of some input parameters and the estimation of other parameters based on performance targets from the Department of Energy SunShot Initiative. This comparison was done for both current and high temperature cases in two configurations: a surround field with an external cylindrical receiver and a north field with a single cavity receiver. There is a fairly dramatic difference between the design point and annual average performance, especially in the solar field and receiver subsystems, and also in energy losses due to the thermal energy storage being full to capacity. Additionally, there are relatively small differences (<2%) in annual average efficiencies between the Base and High Temperature cases, despite an increase in thermal to electric conversion efficiency of over 8%. This is due the increased thermal losses at higher temperature and operational losses due to subsystem start-up and shut-down. Thermal energy storage can mitigate some of these losses by utilizing larger thermal energy storage to ensure that the electric power production system does not need to stop and re-start as often, but solar energy is inherently transient. Economic and cost considerations were not considered here, but will have a significant impact on solar thermal electric power production strategy and sizing.

  14. Colimits for Concurrent Collectors Dusko Pavlovic1

    E-Print Network [OSTI]

    Colimits for Concurrent Collectors Dusko Pavlovic1 , Peter Pepper2 , and Doug Smith1 1 Kestrel is sketched in Section 6. We base our programs on the concept of monads. #12;System Mutator Collector Mut-Spec(M-Env) Coll-Spec(C-Env) M-Env C-Env Mutator-View Collector-View Monad(Heap) Monad(State) Heap State Graph Fig

  15. Project Profile: Improved Large Aperture Collector Manufacturing...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    feasibility demonstrations focused in three main areas: an aggressive manufacturing optimization of the collector sub-structures for lower input material costs & mechanized...

  16. Thermal Conductivity Enhancement of High Temperature Phase Change Materials for Concentrating Solar Power Plant Applications

    E-Print Network [OSTI]

    Roshandell, Melina

    2013-01-01T23:59:59.000Z

    batteries. Solar Water Heater Solar water heater is becomingSolar Water Heater heaters, thermal protection for electronics, spacecrafts, and solar

  17. Automated solar collector installation design

    DOE Patents [OSTI]

    Wayne, Gary; Frumkin, Alexander; Zaydman, Michael; Lehman, Scott; Brenner, Jules

    2014-08-26T23:59:59.000Z

    Embodiments may include systems and methods to create and edit a representation of a worksite, to create various data objects, to classify such objects as various types of pre-defined "features" with attendant properties and layout constraints. As part of or in addition to classification, an embodiment may include systems and methods to create, associate, and edit intrinsic and extrinsic properties to these objects. A design engine may apply of design rules to the features described above to generate one or more solar collectors installation design alternatives, including generation of on-screen and/or paper representations of the physical layout or arrangement of the one or more design alternatives.

  18. The Omniscient Garbage Collector: a Resource Analysis Framework (extended abstract)

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    The Omniscient Garbage Collector: a Resource Analysis Framework (extended abstract) Aurélien point of view, we develop the omniscient garbage collector (OGC), which decides precisely when the resource index requires an omniscient garbage collector, a NP-complete problem tightly connected

  19. The Collector's Brotherhood Dominique Foata,1 Doron Zeilberger2

    E-Print Network [OSTI]

    Zeilberger, Doron

    The Collector's Brotherhood Dominique Foata,1 Doron Zeilberger2 Abstract. Further computations are made on the traditional coupon collector's problem when the collector shares his harvest with his younger brothers. When the book of the p

  20. Performance and cost benefits associated with nonimaging secondary concentrators used in point-focus dish solar thermal applications

    SciTech Connect (OSTI)

    O'Gallagher, J.; Winston, R.

    1987-09-01T23:59:59.000Z

    Using nonimaging secondary concentrators in point-focus applications may permit the development of more cost-effective concentrator systems by either improving performance or reducing costs. Secondaries may also increase design flexibility. The major objective of this study was to develop as complete an understanding as possible of the quantitative performance and cost effects associated with deploying nonimaging secondary concentrators at the focal zone of point-focus solar thermal concentrators. A performance model was developed that uses a Monte Carlo ray-trace procedure to determine the focal plane distribution of a paraboloidal primary as a function of optical parameters. It then calculates the corresponding optimized concentration and thermal efficiency as a function of temperature with and without the secondary. To examine the potential cost benefits associated with secondaries, a preliminary model for the rational optimization of performance versus cost trade-offs was developed. This model suggests a possible 10% to 20% reduction in the cost of delivered energy when secondaries are used. This is a lower limit, and the benefits may even be greater if using a secondary permits the development of inexpensive primary technologies for which the performance would not otherwise be viable. 20 refs., 15 figs., 3 tabs.

  1. Evacuated flat-plate solar collectors

    SciTech Connect (OSTI)

    Whittemore, P.G.

    1981-09-15T23:59:59.000Z

    A structural support system is disclosed for use in an evacuated, flat-plate, solar collector to eliminate the problem of stress fractures in a glass cover plate. Nonlinearly spaced supports are used within the collector to dampen vibrations in the glass cover and to prevent overdeflection before buckling or stress fractures occur.

  2. Chinese Canadian Research Collection / Edgar Wickberg (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Chinese Canadian Research Collection / Edgar Wickberg (collector) Compiled by Christopher Hives Canadian Research Collection / Edgar Wickberg (collector). ­ 1885-1979, 1984-1996. 7.53 m of textual of Research projects undertaken by three UBC professors, Edgar Wickberg (History), Graham Johnson

  3. COMPARISON OF PROPORTIONAL AND ON/OFF SOLAR COLLECTOR LOOP CONTROL STRATEGIES USING A DYNAMIC COLLECTOR MODEL

    E-Print Network [OSTI]

    Schiller, Steven R.

    2013-01-01T23:59:59.000Z

    Flat-Plate Solar Heat Collectors" Solar Energy Vol. 3, No.Thermostats For Solar Collector Systems." inter-officeof Flat-Plate Solar Collectors." M.S. Thesis, University of

  4. UBC Undergraduate Student Examination Collection / UBC Library (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    UBC Undergraduate Student Examination Collection / UBC Library (collector) Compiled by Christopher) #12;Collection Description UBC Undergraduate Student Examination Collection / UBC Library (collector

  5. Karl Terzaghi Research Collection / Charles F. Ripley (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Karl Terzaghi Research Collection / Charles F. Ripley (collector) Compiled by Christopher Hives Karl Terzaghi Research Collection / Charles F. Ripley (collector). ­ 1912 1997. 1.31 m of textual

  6. UBC 50th Anniversary Sound Collection / UBC Archives (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    UBC 50th Anniversary Sound Collection / UBC Archives (collector) Compiled by Erwin Wodarczak (2006 Archives (collector). ­ September- October 1965. 20 audio recordings. Administrative Sketch The University

  7. Investigations of Graphite Current Collectors and Metallic Lithium...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Graphite Current Collectors and Metallic Lithium Anodes Investigations of Graphite Current Collectors and Metallic Lithium Anodes Presentation from the U.S. DOE Office of Vehicle...

  8. Development of an Advanced, Low-Cost parabolic Trough Collector...

    Office of Environmental Management (EM)

    Development of an Advanced, Low-Cost parabolic Trough Collector for Baseload Operation Development of an Advanced, Low-Cost parabolic Trough Collector for Baseload Operation This...

  9. Optical performance of the TBC-2 solar collector before and after the 1993 mirror lustering

    SciTech Connect (OSTI)

    Houser, R.; Strachan, J. [Sandia National Labs., Albuquerque, NM (United States). Solar Thermal Test Dept.

    1995-02-01T23:59:59.000Z

    In 1993, the mirror facets of one of Sandia`s point-focusing solar collectors, the Test Bed Concentrator {number_sign}2 (TBC-2), were reconditioned. The concentrator`s optical performance was evaluated before and after this operation. This report summarizes and compares the results of these tests. The tests demonstrated that the concentrator`s total power and peak flux were increased while the overall flux distribution in the focal plane remained qualitatively the same.

  10. Optimization of central receiver concentrated solar thermal : site selection, heliostat layout & canting

    E-Print Network [OSTI]

    Noone, Corey J. (Corey James)

    2011-01-01T23:59:59.000Z

    In this thesis, two new models are introduced for the purposes of (i) locating sites in hillside terrain suitable for central receiver solar thermal plants and (ii) optimization of heliostat field layouts for any terrain. ...

  11. Design of inflatable solar concentrator

    E-Print Network [OSTI]

    Carrasquillo, Omar (Omar Y. Carrasquillo De Armas)

    2013-01-01T23:59:59.000Z

    Solar concentrators improve the performance of solar collection systems by increasing the amount of usable energy available for a given collector size. Unfortunately, they are not known for their light weight and portability, ...

  12. Novel Molten Salts Thermal Energy Storage for Concentrating Solar Power Generation

    Broader source: Energy.gov [DOE]

    This presentation was delivered at the SunShot Concentrating Solar Power (CSP) Program Review 2013, held April 23–25, 2013 near Phoenix, Arizona.

  13. Summary Report for Concentrating Solar Power Thermal Storage Workshop: New Concepts and Materials for Thermal Energy Storage and Heat-Transfer Fluids, May 20, 2011

    SciTech Connect (OSTI)

    Glatzmaier, G.

    2011-08-01T23:59:59.000Z

    This document summarizes a workshop on thermal energy storage for concentrating solar power (CSP) that was held in Golden, Colorado, on May 20, 2011. The event was hosted by the U.S. Department of Energy (DOE), the National Renewable Energy Laboratory, and Sandia National Laboratories. The objective was to engage the university and laboratory research communities to identify and define research directions for developing new high-temperature materials and systems that advance thermal energy storage for CSP technologies. This workshop was motivated, in part, by the DOE SunShot Initiative, which sets a very aggressive cost goal for CSP technologies -- a levelized cost of energy of 6 cents per kilowatt-hour by 2020 with no incentives or credits.

  14. Survey mirrors and lenses and their required surface accuracy. Volume 2. Concentrator optical performance software (COPS) user's manual. Final report for September 15, 1978-December 1, 1979

    SciTech Connect (OSTI)

    Not Available

    1980-01-01T23:59:59.000Z

    The mathematical modeling of 11 different concentrating collectors is documented and instructions are given for use of the computer code. The 11 concentrators modeled are: faceted mirror concentration; fixed mirror, two-axis tracking receiver; parabolic trough collector; linear Fresnel; incremental reflector; inflated cylindrical concentrator; CPC-involute reflector with evacuated receiver; CPC-parabolic/involute reflector; V trough collectors, imaging collapsing concentrator; and parabolic dish collector. (MHR)

  15. A 20-SUN HYBRID PV-THERMAL LINEAR MICRO-CONCENTRATOR SYSTEM FOR URBAN ROOFTOP APPLICATIONS

    E-Print Network [OSTI]

    , ACT, Australia P. Le Livre 2 , M. Greaves 2 , A. Tanner 2 2 Chromasun Inc, San Jose, CA, United States of America ABSTRACT A unique, linear, low-concentration, hybrid `micro- concentrator' (MCT) system concept, system output of 500 Wpe and 2 kWpt is expected, for a combined system efficiency of up to 75%. The MCT

  16. Molten Salt-Carbon Nanotube Thermal Energy Storage for Concentrating Solar Power Systems

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHighandSWPA / SPRA /Ml'.Solar Thermal Solar Thermal Industrial

  17. Use of Renewable Energy in Buildings: Experiences With Solar Thermal Utilization 

    E-Print Network [OSTI]

    Wang, R.; Zhai, X.

    2006-01-01T23:59:59.000Z

    Solar energy is receiving much more attention in building energy systems in recent years. Solar thermal utilization should be based on the integration of solar collectors into buildings. The facades of buildings can be important solar collectors...

  18. Formal Derivation of Concurrent Garbage Collectors

    E-Print Network [OSTI]

    Pavlovic, Dusko; Smith, Douglas R

    2010-01-01T23:59:59.000Z

    Concurrent garbage collectors are notoriously difficult to implement correctly. Previous approaches to the issue of producing correct collectors have mainly been based on posit-and-prove verification or on the application of domain-specific templates and transformations. We show how to derive the upper reaches of a family of concurrent garbage collectors by refinement from a formal specification, emphasizing the application of domain-independent design theories and transformations. A key contribution is an extension to the classical lattice-theoretic fixpoint theorems to account for the dynamics of concurrent mutation and collection.

  19. Next Generation Solar Collectors for CSP

    SciTech Connect (OSTI)

    Molnar, Attila

    2014-07-31T23:59:59.000Z

    The intent of “Next Generation Solar Collectors for CSP” program was to develop key technology elements for collectors in Phase 1 (Budget Period 1), design these elements in Phase 2 (Budget Period 2) and to deploy and test the final collector in Phase 3 (Budget Period 3). 3M and DOE mutually agreed to terminate the program at the end of Budget Period 1, primarily due to timeline issues. However, significant advancements were achieved in developing a next generation reflective material and panel that has the potential to significantly improve the efficiency of CSP systems.

  20. The Collector's Brotherhood Dominique Foata, 1 Doron Zeilberger 2

    E-Print Network [OSTI]

    Zeilberger, Doron

    The Collector's Brotherhood Dominique Foata, 1 Doron Zeilberger 2 Abstract. Further computations are made on the traditional coupon collector's problem when the collector shares his harvest with his younger brothers. When the book of the p-th brother of the collector is completed, the books

  1. SOME NEW ASPECTS OF THE COUPON COLLECTOR'S PROBLEM

    E-Print Network [OSTI]

    Myers, Amy

    SOME NEW ASPECTS OF THE COUPON COLLECTOR'S PROBLEM AMY N. MYERS AND HERBERT S. WILF SIAM J extend the classical coupon collector's problem to one in which two collectors are simultaneously collectors finish at the same trial, and we find, using the methods of Gessel­ Viennot, the probability

  2. Western Canada Art Circuit Collection / June Binkert (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Western Canada Art Circuit Collection / June Binkert (collector) Compiled by Erwin Wodarczak (1997 Description o Title / Dates of Creation / Physical Description o Collector's Biographical Sketch o Custodial collection / June Binkert (collector). -- 1950, 1957-1970. 62.5 cm of textual records. Collector

  3. Using Prefetching to Improve Reference-Counting Garbage Collectors

    E-Print Network [OSTI]

    Petrank, Erez

    Using Prefetching to Improve Reference-Counting Garbage Collectors Harel Paz 1 and Erez Petrank 2 1-counting collector. We propose potential prefetching opportunities for the advanced reference-counting collector and report an implementation of a collector that employs such prefetch- ing. The proposed prefetch

  4. Biomass Producer or Collector Tax Credit (Oregon)

    Broader source: Energy.gov [DOE]

     The Oregon Department of Energy provides a tax credit for agricultural producers or collectors of biomass.  The credit can be used for eligible biomass used to produce biofuel; biomass used in...

  5. Tilt assembly for tracking solar collector assembly

    DOE Patents [OSTI]

    Almy, Charles; Peurach, John; Sandler, Reuben

    2012-01-24T23:59:59.000Z

    A tilt assembly is used with a solar collector assembly of the type comprising a frame, supporting a solar collector, for movement about a tilt axis by pivoting a drive element between first and second orientations. The tilt assembly comprises a drive element coupler connected to the drive element and a driver, the driver comprising a drive frame, a drive arm and a drive arm driver. The drive arm is mounted to the drive frame for pivotal movement about a drive arm axis. Movement on the drive arm mimics movement of the drive element. Drive element couplers can extend in opposite directions from the outer portion of the drive arm, whereby the assembly can be used between adjacent solar collector assemblies in a row of solar collector assemblies.

  6. Norton Collector Circuit The Norton equivalent circuit seen looking into the collector can be used to solve for the

    E-Print Network [OSTI]

    Leach Jr.,W. Marshall

    Norton Collector Circuit The Norton equivalent circuit seen looking into the collector can be used with Thévenin sources connected to its base and emitter. With the collector grounded, the col- lector current is called the short-circuit output current or ic(sc). The current source in the Norton collector circuit has

  7. Summary of: Simulating the Value of Concentrating Solar Power with Thermal Energy Storage in a Production Cost Model (Presentation)

    SciTech Connect (OSTI)

    Denholm, P.; Hummon, M.

    2013-02-01T23:59:59.000Z

    Concentrating solar power (CSP) deployed with thermal energy storage (TES) provides a dispatchable source of renewable energy. The value of CSP with TES, as with other potential generation resources, needs to be established using traditional utility planning tools. Production cost models, which simulate the operation of grid, are often used to estimate the operational value of different generation mixes. CSP with TES has historically had limited analysis in commercial production simulations. This document describes the implementation of CSP with TES in a commercial production cost model. It also describes the simulation of grid operations with CSP in a test system consisting of two balancing areas located primarily in Colorado.

  8. Final test results for the Schott HCE on a LS-2 collector.

    SciTech Connect (OSTI)

    Moss, Timothy A.; Brosseau, Douglas A.

    2005-07-01T23:59:59.000Z

    Sandia National Laboratories has completed thermal performance testing on the Schott parabolic trough receiver using the LS-2 collector on the Sandia rotating platform at the National Solar Thermal Test Facility in Albuquerque, NM. This testing was funded as part of the US DOE Sun-Lab USA-Trough program. The receiver tested was a new Schott receiver, known as Heat Collector Elements (HCEs). Schott is a new manufacturer of trough HCEs. The Schott HCEs are 4m long; therefore, two were joined and mounted on the LS-2 collector module for the test. The Schott HCE design consists of a 70mm diameter high solar absorptance coated stainless steel (SS) tube encapsulated within a 125mm diameter Pyrex{reg_sign} glass tube with vacuum in the annulus formed between the SS and glass tube to minimize convection heat losses. The Schott HCE design is unique in two regards. First, the bellows used to compensate for the difference in thermal expansion between the metal and glass tube are inside the glass envelope rather than outside. Second, the composition of materials at the glass-to-metal seal has very similar thermal expansion coefficients making the joint less prone to breakage from thermal shock. Sandia National Laboratories provided both the azimuth and elevation collector module tracking systems used during the tests. The test results showed the efficiency of the Schott HCE to be very similar to current HCEs being manufactured by Solel. This testing provided performance verification for the use of Schott tubes with Solargenix trough collector assemblies at currently planned trough power plant projects in Arizona and Nevada.

  9. Nonimaging light concentrator with uniform irradiance

    DOE Patents [OSTI]

    Winston, Roland (Chicago, IL); Gee, Randy C. (Arvada, CO)

    2003-04-01T23:59:59.000Z

    A nonimaging light concentrator system including a primary collector of light, an optical mixer disposed near the focal zone for collecting light from the primary collector, the optical mixer having a transparent entrance aperture, an internally reflective housing for substantially total internal reflection of light, a transparent exit aperture and an array of photovoltaic cells disposed near the transparent exit aperture.

  10. Heat Pipe Performance Enhancement with Binary Mixture Fluids that Exhibit Strong Concentration Marangoni Effects

    E-Print Network [OSTI]

    Armijo, Kenneth Miguel

    2011-01-01T23:59:59.000Z

    two-phase thermosyphon solar water heater”, Energy, 36 , pp.thermal hybrid solar collector water heater”, Proc. ISESheaters simulated waste heat production of the respective PV solar

  11. METAL FOILS FOR DIRECT APPLICATION OF ABSORBER COATINGS ON SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2011-01-01T23:59:59.000Z

    Sputtering for Depositing Solar Collector Coatings".AES Coatings for Solar Collectors Symposium. Atlanta. Ga.Surfaces on Flat Plate Solar Collectors". Proceedings of 2nd

  12. METAL FOILS FOR DIRECT APPLICATION OF ABSORBER COATINGS ON SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2011-01-01T23:59:59.000Z

    Surfaces on Flat Plate Solar Collectors". Proceedings of 2ndfor Depositing Solar Collector Coatings i i • Proceedings ofAES Coatings for Solar Collectors Symposium. Atlanta. Ga.

  13. METAL FOILS FOR DIRECT APPLICATION OF ABSORBER COATINGS ON SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2011-01-01T23:59:59.000Z

    Sputtering for Depositing Solar Collector Coatings".of the AES Coatings for Solar Collectors Symposium. Atlanta.Neutral Surfaces in Solar Collectors." Proceedings of ISES

  14. METAL FOILS FOR DIRECT APPLICATION OF ABSORBER COATINGS ON SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2011-01-01T23:59:59.000Z

    for Depositing Solar Collector Coatings". Proceedings of theSymposium on Coatings for Solar Collectors, . Louis,'MO,OF ABSORBER COATINGS ON SOLAR COLLECTORS Carl M. Lampert

  15. METAL FOILS FOR DIRECT APPLICATION OF ABSORBER COATINGS ON SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2011-01-01T23:59:59.000Z

    of the AES Coatings for Solar Collectors Symposium. Atlanta.Sputtering for Depositing Solar Collector Coatings".Symposium on Coatings for Solar Collectors, . Louis,'MO,

  16. Integrated main rail, feed rail, and current collector

    DOE Patents [OSTI]

    Petri, Randy J. (Crete, IL); Meek, John (Downers Grove, IL); Bachta, Robert P. (Chicago, IL); Marianowski, Leonard G. (Mount Prospect, IL)

    1994-01-01T23:59:59.000Z

    A separator plate for a fuel cell comprising an anode current collector, a cathode current collector and a main plate, the main plate disposed between the anode current collector and the cathode current collector. The anode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the anode side of the separator plate and the cathode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the cathode side of the separator plate. In this manner, the number of components required to manufacture and assemble a fuel cell stack is reduced.

  17. Integrated main rail, feed rail, and current collector

    DOE Patents [OSTI]

    Petri, R.J.; Meek, J.; Bachta, R.P.; Marianowski, L.G.

    1994-11-08T23:59:59.000Z

    A separator plate is described for a fuel cell comprising an anode current collector, a cathode current collector and a main plate, the main plate disposed between the anode current collector and the cathode current collector. The anode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the anode side of the separator plate and the cathode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the cathode side of the separator plate. In this manner, the number of components required to manufacture and assemble a fuel cell stack is reduced. 9 figs.

  18. Advanced Hybrid Particulate Collector Project Management Plan

    SciTech Connect (OSTI)

    Miller, S.J.

    1995-11-01T23:59:59.000Z

    As the consumption of energy increases, its impact on ambient air quality has become a significant concern. Recent studies indicate that fine particles from coal combustion cause health problems as well as atmospheric visibility impairment. These problems are further compounded by the concentration of hazardous trace elements such as mercury, cadmium, selenium, and arsenic in fine particles. Therefore, a current need exists to develop superior, but economical, methods to control emissions of fine particles. Since most of the toxic metals present in coal will be in particulate form, a high level of fine- particle collection appears to be the best method of overall air toxics control. However, over 50% of mercury and a portion of selenium emissions are in vapor form and cannot be collected in particulate control devices. Therefore, this project will focus on developing technology not only to provide ultrahigh collection efficiency of particulate air toxic emissions, but also to capture vapor- phase trace metals such as mercury and selenium. Currently, the primary state-of-the-art technologies for particulate control are fabric filters (baghouses) and electrostatic precipitators (ESPs). However, they both have limitations that prevent them from achieving ultrahigh collection of fine particulate matter and vapor-phase trace metals. The objective of this project is to develop a highly reliable advanced hybrid particulate collector (AHPC) that can provide > 99.99 % particulate collection efficiency for all particle sizes between 0.01 and 50 14m, is applicable for use with all U.S. coals, and is cost-0443competitive with existing technologies. Phase I of the project is organized into three tasks: Task I - Project Management, Reporting, and Subcontract Consulting Task 2 - Modeling, Design, and Construction of 200-acfm AHPC Model Task 3 - Experimental Testing and Subcontract Consulting

  19. Silica and boron-containing ultraphosphate laser glass with low concentration quenching and improved thermal shock resistance

    DOE Patents [OSTI]

    Cook, Lee M. (Duryea, PA); Stokowski, Stanley E. (Danville, CA)

    1987-04-28T23:59:59.000Z

    Neodymium-doped phosphate glasses having a refractive index, nd>1.520; an Abbe number, Vd, <60; a density <3.0 g/cm.sup.3, a thermal expansion coefficient, .alpha., .ltoreq.110.times.10.sup.-7 .degree.C..sup.-1 ; a Young's Modulus, E, <70.times.10.sup.3 N/mm.sup.2 ; a Poisson's Ratio, .nu., <0.28; a thermal conductivity, K, >0.5 W/m.multidot.K, a thermal FOM=(1-.nu.).multidot.K/.alpha.E>0.7, consisting essentially of, in mol. %: P.sub.2 O.sub.5 : 40-70% SiO.sub.2 : 0-20% B.sub.2 O.sub.3 : 5-20% Sum SiO.sub.2 +B.sub.2 O.sub.3 : 5-35% Sum Li.sub.2 O+Na.sub.2 O+K.sub.2 O: 5-20% Sum La.sub.2 O.sub.3 +Nd.sub.2 O.sub.3 : 3-10% Sum MgO+CaO+SrO+BaO+ZnO: 0-10% and preferably containing an amount of Nd.sub.2 O.sub.3 effective for laser activity having an emission cross-section, .sigma., >3.5.times.10.sup.-20 cm.sup.2 ; a fluorescence linewidth (.DELTA..lambda..sub.f1)<23.5 nm; a first e-folding time of the Nd.sup.3+ fluorescence at 0.5 wt. % Nd.sub.2 O.sub.3 >375 .mu.sec, and a first e-folding time of the Nd.sup.3+ fluorescence at 10 wt. % >175 .mu.sec at 10 wt. %, have very low self-concentration quenching rates.

  20. Determining the optical quality of focusing collectors without laser ray tracing

    SciTech Connect (OSTI)

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

    1980-02-01T23:59:59.000Z

    This paper describes a novel alternative to the laser ray trace technique for evaluating the optical quality of focusing solar collectors. The new method does not require any equipment beyond what is used for measuring collector efficiency; it could therefore become part of routine collector testing. The total optical errors resulting from imperfect specularity and from inaccuracies in reflector position or slope are characterized by an angular standard deviation sigma/sub optical/, the rms deviation of the reflected rays from the design direction. The method is based on the fact that the off-axis performance of a concentrator depends on sigma/sub optical/. An angular scan is performed, i.e., the collector output is measured as a function of misalignment angle over the entire range of angles for which there is measurable output (typically a few degrees). This test should be carried out on a very clear day, with receiver close to ambient temperature (if the latter conditions cannot be satisfied, appropriate corrections are necessary). The parameter sigma/sub optical/ is then determined by a least-squares fit between the measured and the calculated angular scan. We tested the method on a parabolic trough collector manufactured by Hexcel, but it is suitable for parabolic dishes as well. The method appears to be accurate enough to determine sigma/sub optical/ within about 10%.

  1. NREL: Concentrating Solar Power Research - Collector R&D

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Saleshttp://www.fnal.gov/directorate/nalcal/nalcal02_07_05_files/nalcal.gifNREL NRELChemical andWhat Is

  2. SELECTIVE ABSORBER COATED FOILS FOR SOLAR COLLECTORS

    SciTech Connect (OSTI)

    Lampert, Carl M.

    1980-04-01T23:59:59.000Z

    Solar absorber metal foils are discussed in terms of materials and basic processing science. Also included is the use of finished heavy sheet stock for direct fabrication of solar collector panels. Both the adhesives and bonding methods for foils and sheet are surveyed. Developmental and representative commercial foils are used as illustrative examples. As a result it was found that foils can compete economically with batch plating but are limited by adhesive temperature stability. Also absorber foils are very versatile and direct collector fabrication from heavy foils appears very promising.

  3. Cinema 16 Collection / A.C. Killip (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Cinema 16 Collection / A.C. Killip (collector) University of British Columbia Archives #12;Table;Collection Description Cinema 16 Collection / A.C. Killip (collector). ­ 1961-1970. 1.5 cm of textual records

  4. Numerical Simulation Study on Transpired Solar Air Collector

    E-Print Network [OSTI]

    Wang, C.; Guan, Z.; Zhao, X.; Wang, D.

    2006-01-01T23:59:59.000Z

    The unglazed transpired solar air collector is now a well-recognized solar air heater for heating outside air directly. In this article, researchers introduced numerical simulation tools into the solar air collector research area, analyzed...

  5. Numerical Simulation Study on Transpired Solar Air Collector 

    E-Print Network [OSTI]

    Wang, C.; Guan, Z.; Zhao, X.; Wang, D.

    2006-01-01T23:59:59.000Z

    The unglazed transpired solar air collector is now a well-recognized solar air heater for heating outside air directly. In this article, researchers introduced numerical simulation tools into the solar air collector research area, analyzed...

  6. U-153: EMC Data Protection Advisor Server and Collector Bugs...

    Broader source: Energy.gov (indexed) [DOE]

    53: EMC Data Protection Advisor Server and Collector Bugs Let Remote Users Deny Service U-153: EMC Data Protection Advisor Server and Collector Bugs Let Remote Users Deny Service...

  7. Characteristics of two thermionic converters with oxide collectors

    SciTech Connect (OSTI)

    Smith, E.A.; Huffman, F.N.

    1984-08-01T23:59:59.000Z

    Thermionic converters built with selected metal oxide coatings on their collectors have given enhanced performance at interelectrode spacings greater than 0.25 mm. The capability of such converters to operate efficiently at large interelectrode spacings is of interest for in-core thermionic power systems. Performance data are reported from one converter built with a collector having a coating of molybdenum sublimed in oxygen and a second converter containing an oxidized zirconium collector. The molybdenum oxide collector converter demonstrated enhanced performance.

  8. Phase-change thermal energy storage: Final subcontract report

    SciTech Connect (OSTI)

    Not Available

    1989-11-01T23:59:59.000Z

    The research and development described in this document was conducted within the US Department of Energy's Solar Thermal Technology Program. The goal of this program is to advance the engineering and scientific understanding of solar thermal technology and to establish the technology base from which private industry can develop solar thermal power production options for introduction into the competitive energy market. Solar thermal technology concentrates the solar flux using tracking mirrors or lenses onto a receiver where the solar energy is absorbed as heat and converted into electricity or incorporated into products as process heat. The two primary solar thermal technologies, central receivers and distributed receivers, employ various point and line-focus optics to concentrate sunlight. Current central receiver systems use fields of heliostats (two-axes tracking mirrors) to focus the sun's radiant energy onto a single, tower-mounted receiver. Point focus concentrators up to 17 meters in diameter track the sun in two axes and use parabolic dish mirrors or Fresnel lenses to focus radiant energy onto a receiver. Troughs and bowls are line-focus tracking reflectors that concentrate sunlight onto receiver tubes along their focal lines. Concentrating collector modules can be used alone or in a multimodule system. The concentrated radiant energy absorbed by the solar thermal receiver is transported to the conversion process by a circulating working fluid. Receiver temperatures range from 100{degree}C in low-temperature troughs to over 1500{degree}C in dish and central receiver systems. 12 refs., 119 figs., 4 tabs.

  9. Skagit Valley Research Collection / Ian E. Efford (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Skagit Valley Research Collection / Ian E. Efford (collector) Compiled by Christopher Hives (1997 of Creation / Physical Description o Collector's Biographical Sketch o Scope and Content o Notes File List-1982. 13 cm of textual records. 35 photographs. Collector's Biographical Sketch Ian Efford was an ecologist

  10. History of Education Research Collection / John Neil Sutherland (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    History of Education Research Collection / John Neil Sutherland (collector) Last revised September / Dates of Creation / Physical Description o Collector's Biographical Sketch o Scope and Content o Notes Research Collection / John Neil Sutherland (collector). ­ 1888- 1909, 1948-1949. 14 cm of textual materials

  11. Automated Verification of Practical Garbage Collectors Chris Hawblitzel

    E-Print Network [OSTI]

    Petrank, Erez

    Automated Verification of Practical Garbage Collectors Chris Hawblitzel Microsoft Research One Technion Haifa 32000 Israel erez@cs.technion.ac.il Abstract Garbage collectors are notoriously hard in reasoning about reachability in graphs. Several papers have presented verified collectors, but either

  12. Accepted Manuscript Title: Metal Current Collector-Free Freestanding

    E-Print Network [OSTI]

    Cui, Yi

    Accepted Manuscript Title: Metal Current Collector-Free Freestanding Silicon-Carbon 1D, Metal Current Collector-Free Freestanding Silicon-Carbon 1D Nanocomposites for Ultralight Anodes that apply to the journal pertain. #12;Page 1 of 20 Accepted M anuscript 1 Metal Current Collector

  13. Formal Derivation of Concurrent Garbage Collectors Dusko Pavlovic1

    E-Print Network [OSTI]

    Smith, Douglas R.

    Formal Derivation of Concurrent Garbage Collectors Dusko Pavlovic1 , Peter Pepper2 , and Douglas R¨at Berlin and Fraunhofer FIRST, Berlin pepper@cs.tu-berlin.de Abstract. Concurrent garbage collectors are notoriously difficult to implement correctly. Previous approaches to the issue of producing correct collectors

  14. The Generalized Coupon Collector Problem John Moriarty & Peter Neal

    E-Print Network [OSTI]

    Sidorov, Nikita

    The Generalized Coupon Collector Problem John Moriarty & Peter Neal First version: 30 April 2008 of Manchester #12;Applied Probability Trust (25 April 2008) THE GENERALIZED COUPON COLLECTOR PROBLEM JOHN the population is the classic coupon collector problem. We consider the asymptotic distribution Y (appropriately

  15. Towards Hinted Collection Annotations for decreasing garbage collector pause times

    E-Print Network [OSTI]

    Necula, George

    Towards Hinted Collection Annotations for decreasing garbage collector pause times Philip Reames are influenced as much by garbage collector behavior as by resource availability. We present an alternate performance not correct- ness. Our hinted collector algorithm uses these hints to identify a subset

  16. Contribution ID : 133 The TAG Collector -A Tool for Atlas

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    CHEP04 Contribution ID : 133 The TAG Collector - A Tool for Atlas Code Release Management Thursday 30 Sep 2004 at 10:00 (00h00') The Tag Collector is a web interfaced database application for release distributed geographically. The Tag Collector was designed and implemented during the summer of 2001

  17. Community Arts Council of Vancouver Collection / Melva Dwyer (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    Community Arts Council of Vancouver Collection / Melva Dwyer (collector) Compiled by Christopher L Collection Description o Title / Dates of Creation / Physical Description o Collector's Biographical Sketch o Council of Vancouver Collection, Melva Dwyer (collector). - 1953- 1969. 26 cm of textual records

  18. San Francisco Bay Map Collection / Neal Harlow (collector)

    E-Print Network [OSTI]

    Handy, Todd C.

    San Francisco Bay Map Collection / Neal Harlow (collector) Last revised October 2011 University / Physical Description o Collector's Biographical Sketch o Scope and Content o Notes Catalogue entry (UBC Library catalogue) #12;Collection Description San Francisco Bay Map Collection / Neal Harlow (collector

  19. Optimal Power Train Design of a Hybrid Refuse Collector Vehicle

    E-Print Network [OSTI]

    Paderborn, Universität

    Optimal Power Train Design of a Hybrid Refuse Collector Vehicle Tobias Knoke, Joachim Böcker 5251 60 2212 Abstract-- Due to the stop-and-go drive cycle of refuse collector vehicles, hybrid power), optimization, refuse collector vehicle I. INTRODUCTION Today, hybrid electric vehicles are accepted as a step

  20. Derivation and Evaluation of Concurrent Collectors Martin T. Vechev1

    E-Print Network [OSTI]

    Grove, David

    Derivation and Evaluation of Concurrent Collectors Martin T. Vechev1 , David F. Bacon2 , Perry garbage collection algorithm, and show how existing snapshot and incremental update collectors, can that reduces floating garbage while terminating quickly. We have implemented a concurrent collector framework

  1. A General Framework for Certifying Garbage Collectors and Their Mutators

    E-Print Network [OSTI]

    A General Framework for Certifying Garbage Collectors and Their Mutators Andrew McCreight + Zhong and security of a large portion of the world's mission­critical software. Unfortunately, garbage collectors uniform approach to verifying the safety of both a mutator and its garbage collector in Hoare­style logic

  2. Surface Modification of MCFC Current Collectors for Improved

    E-Print Network [OSTI]

    Popov, Branko N.

    Surface Modification of MCFC Current Collectors for Improved Lifetime Héctor Colón-Mercado, Anand Columbia, SC 29208 #12;State of the Art Current Collectors · SS 316 is currently used as a current collector ­ Oxidation of SS occur in the cathode atmosphere ­ SS components (Cr) dissolves in the carbonate

  3. A General Framework for Certifying Garbage Collectors and Their Mutators

    E-Print Network [OSTI]

    A General Framework for Certifying Garbage Collectors and Their Mutators Andrew McCreight Zhong and security of a large portion of the world's mission-critical software. Unfortunately, garbage collectors uniform approach to verifying the safety of both a mutator and its garbage collector in Hoare-style logic

  4. Connectable solar air collectors Solar Energy Centre Denmark

    E-Print Network [OSTI]

    Connectable solar air collectors Solar Energy Centre Denmark Danish Technological Institute SEC-R-22 #12;Connectable solar air collectors Søren Østergaard Jensen Miroslav Bosanac Solar Energy Centre Package 91 #12;92 #12;93 #12;Appendix B Working drawings for the connectable solar air collectors 94 #12

  5. Adaptive Receding Horizon Control of a Distributed Collector Solar Field

    E-Print Network [OSTI]

    Sontag, Eduardo

    for a distributed collector solar field which ex- plicitly explores its distributed parameter character. The plant, distributed collector solar fields are repre- sentative of an important class of distributed parameter plantsAdaptive Receding Horizon Control of a Distributed Collector Solar Field J.M. Igreja, J. M. Lemos

  6. Department of Electrical Engineering Spring 2011 Glass Block Solar Collector

    E-Print Network [OSTI]

    Demirel, Melik C.

    PENNSTATE Department of Electrical Engineering Spring 2011 Glass Block Solar Collector Overview of the team to incorporate solar collectors into glass blocks and provide an application for the collected energy. Objectives The team's objective was to deliver a working glass block solar collector

  7. Solar collector apparatus having increased energy rejection during stagnation

    DOE Patents [OSTI]

    Moore, S.W.

    1981-01-16T23:59:59.000Z

    An active solar collector having increased energy rejection during stagnation is disclosed. The collector's glazing is brought into substantial contact with absorber during stagnation to increase re-emittance and thereby to maintan lower temperatures when the collector is not in operation.

  8. Graphite Foams for Lithium-Ion Battery Current Collectors

    SciTech Connect (OSTI)

    Dudney, Nancy J [ORNL; Tiegs, Terry N [ORNL; Kiggans, Jim [ORNL; Jang, Young-Il [ORNL; Klett, James William [ORNL

    2007-01-01T23:59:59.000Z

    Graphite open-cell foams, with their very high electronic and thermal conductivities, may serve as high surface area and corrosion resistant current collectors for lithium-ion batteries. As a proof of principle, cathodes were prepared by sintering carbon-coated LiFePO4 particles into the porous graphite foams. Cycling these cathodes in a liquid electrolyte cell showed promising performance even for materials and coatings that have not been optimized. The specific capacity is not limited by the foam structure, but by the cycling performance of the coated LiFePO4 particles. Upon extended cycling for more than 100 deep cycles, no loss of capacity is observed for rates of C/2 or less. The uncoated graphite foams will slowly intercalate lithium reversibly at potentials less than 0.2 volts versus lithium.

  9. Cable tensioned membrane solar collector module with variable tension control

    DOE Patents [OSTI]

    Murphy, L.M.

    1984-01-09T23:59:59.000Z

    Disclosed is a solar collector comprising a membrane member for concentrating sunlight, a plurality of elongated structural members for suspending the membrane member thereon, and a plurality of control members for adjustably tensioning the membrane member, as well as for controlling a focus produced by the membrane members. Each control member is disposed at a different corresponding one of the plurality of structural members. The collector also comprises an elongated flexible tensioning member, which serves to stretch the membrane member and to thereafter hold it in tension, and a plurality of sleeve members which serve to provide the membrane member with a desired surface contour during tensioning of the membrane member. The tensioning member is coupled to the structural members such that the tensioning member is adjustably tensioned through the structural members. The tensioning member is also coupled to the membrane member through the sleeve members such that the sleeve members uniformly and symmetrically stretch the membrane member upon applying tension to the tensioning member with the control members.

  10. Cable tensioned membrane solar collector module with variable tension control

    DOE Patents [OSTI]

    Murphy, Lawrence M. (Lakewood, CO)

    1985-01-01T23:59:59.000Z

    Disclosed is a solar collector comprising a membrane for concentrating sunlight, a plurality of elongated structural members for suspending the membrane member thereon, and a plurality of control members for adjustably tensioning the membrane member, as well as for controlling a focus produced by the membrane members. Each control member is disposed at a different corresponding one of the plurality of structural members. The collector also comprises an elongated flexible tensioning member, which serves to stretch the membrane member and to thereafter hold it in tension, and a plurality of sleeve members, which serve to provide the membrane member with a desired surface contour during tensioning of the membrane member. The tensioning member is coupled to the structural members such that the tensioning member is adjustably tensioned through the structural members. The tensioning member is also coupled to the membrane member through the sleeve members such that the sleeve members uniformly and symmetrically stretch the membrane member upon applying tension to the tensioning member with the control members.

  11. Using Encapsulated Phase Change Material in Thermal Energy Storage for Baseload Concentrating Solar Power (EPCM-TES)

    SciTech Connect (OSTI)

    Mathur, Anoop [Terrafore Technologies LLC, Minneapolis, MN (United States)

    2013-12-15T23:59:59.000Z

    Terrafore successfully demonstrated and optimized the manufacturing of capsules containing phase-changing inorganic salts. The phase change was used to store thermal energy collected from a concentrating solar-power plant as latent heat. This latent heat, in addition to sensible heat increased the energy density (energy stored per unit weight of salt) by over 50%, thus requiring 40% less salt and over 60% less capsule container. Therefore, the cost to store high-temperature thermal energy collected in a concentrating solar power plant will be reduced by almost 40% or more, as compared to conventional two-tank, sensible-only storage systems. The cost for thermal energy storage (TES) system is expected to achieve the Sun Shot goal of $15 per kWh(t). Costs associated with poor heat-transfer in phase change materials (PCM) were also eliminated. Although thermal energy storage that relies on the latent heat of fusion of PCM improves energy density by as much as 50%, upon energy discharge the salt freezes and builds on the heat transfer surfaces. Since these salts have low thermal conductivity, large heat-transfer areas, or larger conventional heat-exchangers are needed, which increases costs. By encapsulating PCM in small capsules we have increased the heat transfer area per unit volume of salt and brought the heat transfer fluid in direct contact with the capsules. These two improvements have increased the heat transfer coefficient and boosted heat transfer. The program was successful in overcoming the phenomenon of melt expansion in the capsules, which requires the creation of open volume in the capsules or shell to allow for expansion of the molten salt on melting and is heated above its melting point to 550°C. Under contract with the Department of Energy, Terrafore Inc. and Southwest Research Institute, developed innovative method(s) to economically create the open volume or void in the capsule. One method consists of using a sacrificial polymer coating as the middle layer between the salt prill and the shell material. The selected polymer decomposes at temperatures below the melting point of the salt and forms gases which escape through the pores in the capsule shell thus leaving a void in the capsule. We have demonstrated the process with a commonly used inorganic nitrate salt in a low-cost shell material that can withstand over 10,000 high-temperature thermal cycles, or a thirty-year or greater life in a solar plant. The shell used to encapsulate the salt was demonstrated to be compatible with molten salt heat transfer fluid typically used in CSP plants to temperatures up to 600 °C. The above findings have led to the concept of a cascaded arrangement. Salts with different melting points can be encapsulated using the same recipe and contained in a packed bed by cascading the salt melting at higher melting point at the top over the salt melting at lower melting point towards the bottom of the tank. This cascaded energy storage is required to effectively transfer the sensible heat collected in heat transfer fluids between the operating temperatures and utilize the latent heat of fusion in the salts inside the capsule. Mathematical models indicate that over 90% of the salts will undergo phase change by using three salts in equal proportion. The salts are selected such that the salt at the top of the tank melts at about 15°C below the high operating-temperature, and the salt at the bottom of the tank melts 15°C above the low operating-temperature. The salt in the middle of tank melts in-between the operating temperature of the heat transfer fluid. A cascaded arrangement leads to the capture of 90% of the latent-heat of fusion of salts and their sensible heats. Thus the energy density is increased by over 50% from a sensible-only, two-tank thermal energy storage. Furthermore, the Terrafore cascaded storage method requires only one tank as opposed to the two-tanks used in sensible heat storage. Since heat is transferred from the heat transfer fluid by direct contact with capsules, external heat-exchangers are not required

  12. Scattering Solar Thermal Concentrators

    Broader source: Energy.gov [DOE]

    This document summarizes the progress of this Penn State project, funded by SunShot, for the second quarter of fiscal year 2013.

  13. Efficient solar cooling: first ever non-tracking solar collectors powering a double effect absorption chiller

    E-Print Network [OSTI]

    Poiry, Heather Marie

    2011-01-01T23:59:59.000Z

    2004) “Advances in solar thermal electricity technology”.1: Comparison of the pros and cons for various solar thermalof Three Concentrating Solar Thermal Units Designed with

  14. The Effects of Nanoparticle Augmentation of Nitrate Thermal Storage Materials for Use in Concentrating Solar Power Applications

    E-Print Network [OSTI]

    Betts, Matthew

    2011-08-08T23:59:59.000Z

    The Department of Energy funded a project to determine if the specific heat of thermal energy storage materials could be improved by adding nanoparticles. The standard thermal energy storage materials are molten salts. The chosen molten salt was a...

  15. A Self-Biasing Pulsed Depressed Collector

    SciTech Connect (OSTI)

    Kemp, Mark A.; Jensen, Aaron; Neilson, Jeff; /SLAC

    2014-05-29T23:59:59.000Z

    Depressed collectors have been utilized successfully for many years to improve the electrical efficiency of vacuum electron devices. Increasingly, pulsed, high-peak power accelerator applications are placing a premium on electrical efficiency. As RF systems are responsible for a large percentage of the overall energy usage at accelerator laboratories, methods to improve upon the state-of-the-art in pulsed high-power sources are desired. This paper presents a technique for self-biasing the stages in a multistage depressed collector. With this technique, the energy lost during the rise and fall times of the pulse can be recovered, separate power supplies are not needed, and existing modulators can be retrofitted. Calculations show that significant cost savings can be realized with the implementation of this device in high-power systems. In this paper, the technique is described along with experimental demonstration. (auth)

  16. Focusing solar collector and method for manufacturing same

    DOE Patents [OSTI]

    Murphy, Lawrence M. (Lakewood, CO)

    1984-01-01T23:59:59.000Z

    Disclosed is a solar collector comprising an annular-shaped frame and a composite membrane member for concentrating and focusing sun radiation. The composite membrane member is supported and tensioned by the frame and consists of first and second differentially pretensioned sheet members which are integrally bonded to one another. The frame and one of the two sheet members are adapted to allow tensions in both of the sheets to be adjusted. Subsequent to bonding and upon adjusting a tension in one of the two sheet members, both of the two bonded sheet members react with one another so as to cause the composite membrane member to have a contoured configuration, which enables the membrane member to be focusable. Additionally, adjusting the tension in one of the two sheet members provides a reciprocal adjustment in a focus provided by the membrane member.

  17. Focusing solar collector and method for manufacturing same

    DOE Patents [OSTI]

    Murphy, L.M.

    1984-01-01T23:59:59.000Z

    Disclosed is a solar collector comprising an annular-shaped frame and a composite membrane member for concentrating and focusing sun radiation. The composite membrane member is supported and tensioned by the frame and consists of first and second differentially pretensioned sheet members which are integrally bonded to one another. The frame and one of the two sheet members are adapted to allow tensions in both of the two sheets to be adjusted. Subsequent to bonding and upon adjusting a tension in one of the two sheet members, both of the two bonded sheet members react with one another so as to cause the composite membrane member to have a contoured configuration, which enables the membrane member to be focusable. Additionally, adjusting the tension in one of the two sheet members provides a reciprocal adjustment in a focus provided by the membrane member.

  18. Collector main replacement at Indianapolis Coke

    SciTech Connect (OSTI)

    Sickle, R.R. Van

    1997-12-31T23:59:59.000Z

    Indianapolis Coke is a merchant coke producer, supplying both foundry and blast furnace coke to the industry. The facility has three coke batteries: two 3 meter batteries, one Wilputte four divided and one Koppers Becker. Both batteries are underjet batteries and are producing 100% foundry coke at a net coking time of 30.6 hours. This paper deals with the No. 1 coke battery, which is a 72 oven, gun fired, 5 meter Still battery. No. 1 battery produces both foundry and blast furnace coke at a net coking rate of 25.4 hours. No. 1 battery was commissioned in 1979. The battery is equipped with a double collector main. Although many renovations have been completed to the battery, oven machinery and heating system, to date no major construction projects have taken place. Deterioration of the collector main was caused in part from elevated levels of chlorides in the flushing liquor, and temperature fluctuations within the collector main. The repair procedures are discussed.

  19. Thin film absorber for a solar collector

    DOE Patents [OSTI]

    Wilhelm, William G. (Cutchogue, NY)

    1985-01-01T23:59:59.000Z

    This invention pertains to energy absorbers for solar collectors, and more particularly to high performance thin film absorbers. The solar collectors comprising the absorber of this invention overcome several problems seen in current systems, such as excessive hardware, high cost and unreliability. In the preferred form, the apparatus features a substantially rigid planar frame with a thin film window bonded to one planar side of the frame. An absorber in accordance with the present invention is comprised of two thin film layers that are sealed perimetrically. In a preferred embodiment, thin film layers are formed from a metal/plastic laminate. The layers define a fluid-tight planar envelope of large surface area to volume through which a heat transfer fluid flows. The absorber is bonded to the other planar side of the frame. The thin film construction of the absorber assures substantially full envelope wetting and thus good efficiency. The window and absorber films stress the frame adding to the overall strength of the collector.

  20. Software-as-a-Service Optimised Scheduling of a Solar-Assisted HVAC System with Thermal Storage

    E-Print Network [OSTI]

    Mammoli, Andrea

    2014-01-01T23:59:59.000Z

    performance of a solar-thermal- assisted hvac system. Energyfor rows of fixed solar thermal collectors using flatassisted by a 232 m solar thermal array providing heat to a

  1. Mobile Information Collectors' Trajectory Data Warehouse Design

    E-Print Network [OSTI]

    oueslati, wided

    2010-01-01T23:59:59.000Z

    To analyze complex phenomena which involve moving objects, Trajectory Data Warehouse (TDW) seems to be an answer for many recent decision problems related to various professions (physicians, commercial representatives, transporters, ecologists ...) concerned with mobility. This work aims to make trajectories as a first class concept in the trajectory data conceptual model and to design a TDW, in which data resulting from mobile information collectors' trajectory are gathered. These data will be analyzed, according to trajectory characteristics, for decision making purposes, such as new products commercialization, new commerce implementation, etc.

  2. Numerical and Experimental Investigation of Inorganic Nanomaterials for Thermal Energy Storage (TES) and Concentrated Solar Power (CSP) Applications

    E-Print Network [OSTI]

    Jung, Seunghwan

    2012-07-16T23:59:59.000Z

    maximizing the thermal conductivity of the nanomaterial (which typically occurs for nanoparticle size varying between ~ 20-30nm) and maximizing the specific heat capacity (which typically occurs for nanoparticle size less than 5nm), while simultaneously...

  3. Numerical and Experimental Investigation of Inorganic Nanomaterials for Thermal Energy Storage (TES) and Concentrated Solar Power (CSP) Applications 

    E-Print Network [OSTI]

    Jung, Seunghwan

    2012-07-16T23:59:59.000Z

    cause significant enhancement in the specific heat capacity of nanofluids and nanocomposites. The interfacial thermal resistance (also known as Kapitza resistance, or “Rk”) between a nanoparticle and the surrounding solvent molecules (for these molten...

  4. Instructions for transmitting Collector files to KFS In order for a department's KFS Collector file to be processed, departments must transfer the file to an

    E-Print Network [OSTI]

    Stephens, Graeme L.

    Instructions for transmitting Collector files to KFS In order for a department's KFS Collector file. The name of the KFS Collector file transferred to the Information Systems server by each department should in .xml. Once a department's Collector file has been processed by KFS it will be removed from

  5. Thermal Solar Energy Systems for Space Heating of Buildings

    E-Print Network [OSTI]

    Gomri, R.; Boulkamh, M.

    2010-01-01T23:59:59.000Z

    combined with heat pump improve the thermal performance of the heat pump and the global system. The performances of the heating system combining heat pump and solar collectors are higher than that of solar heating system with solar collectors and storage...

  6. The Collector's Brotherhood Problem Using the Newman-Shepp Symbolic Method

    E-Print Network [OSTI]

    Foata, Dominique

    The Collector's Brotherhood Problem Using the Newman-Shepp Symbolic Abstract. Further computations are made on the traditional coupon collector's problem when the collector shares his harvest with his younger brothers. When the book of the p-th brother

  7. A SOLAR TEST COLLECTOR FOR EVALUATION OF BOTH SELECTIVE AND NON-SELECTIVE ABSORBERS

    E-Print Network [OSTI]

    Lampert, C.M.

    2011-01-01T23:59:59.000Z

    6974 Rev. e. ' A SOLAR TEST COLLECTOR FOR EVALUATION OF BOTHFig. L r2 r2 Solar test collector flow chart. Type Slope (-2. ai ei ai/ei SOlar test collector in operation, side view.

  8. `Print Networks' Conference, Cambridge 2009 Collectors, Librarians and the Book Trade

    E-Print Network [OSTI]

    Miall, Chris

    `Print Networks' Conference, Cambridge 2009 Collectors, Librarians and the Book Trade Reports in establishing an authorial canon. Eighteenth and nineteenth century librarians and collectors were especially conference, `Collectors, Libraries and the Book Tr

  9. Efficient solar cooling: first ever non-tracking solar collectors powering a double effect absorption chiller

    E-Print Network [OSTI]

    Poiry, Heather Marie

    2011-01-01T23:59:59.000Z

    Ari Rabl, “Active Solar Collectors and Their Applications,”A. and Winston, R. (1980) “Solar collectors for low anda standard flat plate solar collector, and to the right is a

  10. METAL FOILS FOR DIRECT APPLICATION OF ABSORBER COATINGS ON SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2011-01-01T23:59:59.000Z

    Plated Metal Foils and Solar Collector Conference. U. S.Surfaces on Flat Plate Solar Collectors". Proceedings of 2ndSputtering for Depositing Solar Collector Coatings i i •

  11. METAL FOILS FOR DIRECT APPLICATION OF ABSORBER COATINGS ON SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2011-01-01T23:59:59.000Z

    for Depositing Solar Collector Coatings i i • Proceedings ofSymposium on Coatings for Solar Collectors, St. Louis, MO,OF ABSORBER COATINGS ON SOLAR COLLECTORS Carl M. Lampert

  12. METAL FOILS FOR DIRECT APPLICATION OF ABSORBER COATINGS ON SOLAR COLLECTORS

    E-Print Network [OSTI]

    Lampert, Carl M.

    2011-01-01T23:59:59.000Z

    of the AES Coatings for Solar Collectors Symposium. Atlanta.Symposium on Coatings for Solar Collectors, St. Louis, MO,OF ABSORBER COATINGS ON SOLAR COLLECTORS Carl M. Lampert

  13. Chemically Reactive Working Fluids for the Capture and Transport of Concentrated Solar Thermal Energy for Power Generation

    Broader source: Energy.gov [DOE]

    This presentation was delivered at the SunShot Concentrating Solar Power (CSP) Program Review 2013, held April 23–25, 2013 near Phoenix, Arizona.

  14. Current collectors for rechargeable Li-Air batteries

    SciTech Connect (OSTI)

    Veith, Gabriel M [ORNL; Dudney, Nancy J [ORNL

    2011-01-01T23:59:59.000Z

    Here we report the negative influence of porous nickel foam for use as current collectors in rechargeable Li-air batteries. Uncoated nickel foam promotes the decomposition of LiPF6-organic carbonate electrolytes under normal charging conditions reported for rechargeable Li-air cells. We have identified Ni free porous carbon supports as more appropriate cathode current collectors.

  15. Selective flotation of phosphate minerals with hydroxamate collectors

    DOE Patents [OSTI]

    Miller, Jan D. (Salt Lake City, UT); Wang, Xuming (Salt Lake City, UT); Li, Minhua (Salt Lake City, UT)

    2002-01-01T23:59:59.000Z

    A method is disclosed for separating phosphate minerals from a mineral mixture, particularly from high-dolomite containing phosphate ores. The method involves conditioning the mineral mixture by contacting in an aqueous in environment with a collector in an amount sufficient for promoting flotation of phosphate minerals. The collector is a hydroxamate compound of the formula; ##STR1## wherein R is generally hydrophobic and chosen such that the collector has solubility or dispersion properties it can be distributed in the mineral mixture, typically an alkyl, aryl, or alkylaryl group having 6 to 18 carbon atoms. M is a cation, typically hydrogen, an alkali metal or an alkaline earth metal. Preferably, the collector also comprises an alcohol of the formula, R'--OH wherein R' is generally hydrophobic and chosen such that the collector has solubility or dispersion properties so that it can be distributed in the mineral mixture, typically an alkyl, aryl, or alkylaryl group having 6 to 18 carbon atoms.

  16. Project Profile: High-Concentration, Low-Cost Parabolic Trough...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Profile: High-Concentration, Low-Cost Parabolic Trough System for Baseload CSP SkyFuel logo SkyFuel, under the Baseload CSP FOA, is developing an advanced, low-cost CSP collector...

  17. Alignment method for solar collector arrays

    DOE Patents [OSTI]

    Driver, Jr., Richard B

    2012-10-23T23:59:59.000Z

    The present invention is directed to an improved method for establishing camera fixture location for aligning mirrors on a solar collector array (SCA) comprising multiple mirror modules. The method aligns the mirrors on a module by comparing the location of the receiver image in photographs with the predicted theoretical receiver image location. To accurately align an entire SCA, a common reference is used for all of the individual module images within the SCA. The improved method can use relative pixel location information in digital photographs along with alignment fixture inclinometer data to calculate relative locations of the fixture between modules. The absolute locations are determined by minimizing alignment asymmetry for the SCA. The method inherently aligns all of the mirrors in an SCA to the receiver, even with receiver position and module-to-module alignment errors.

  18. Design approaches for solar industrial process-heat systems: nontracking and line-focus collector technologies

    SciTech Connect (OSTI)

    Kutscher, C.F.; Davenport, R.L.; Dougherty, D.A.; Gee, R.C.; Masterson, P.M.; May, E.K.

    1982-08-01T23:59:59.000Z

    The design methodology for solar industrial process heat systems is described, and an overview is given of the use of solar energy in industry. A way to determine whether solar energy makes sense for a particular application is described. The basic system configurations used to supply hot water or steam are discussed, and computer-generated graphs are supplied that allow the user to select a collector type. Detailed energy calculations are provided, including the effects of thermal losses and storage. The selection of subsystem components is described, and control systems, installation and start-up details, economics, and safety and environmental issues are explained. (LEW)

  19. Engineering the optical properties of luminescent solar concentrators at the molecular scale

    E-Print Network [OSTI]

    Mulder, Carlijn Lucinde

    2012-01-01T23:59:59.000Z

    Luminescent Solar Concentrators (LSCs) concentrate solar radiation onto photovoltaic (PV) cells using an inexpensive collector plate to absorb incoming photons and waveguide fluorescently re-emitted photons to PVs at the ...

  20. Theory for optimal design of waveguiding light concentrators in photovoltaic microcell arrays

    E-Print Network [OSTI]

    Rogers, John A.

    Theory for optimal design of waveguiding light concentrators in photovoltaic microcell arrays of ultrathin flexible solar photovoltaic silicon microcell arrays can be significantly improved using collectors do not result in their indirect gain degradation compared to flat solar concentrators

  1. Electron beam collector for a microwave power tube

    DOE Patents [OSTI]

    Dandl, Raphael A. (Oak Ridge, TN)

    1980-01-01T23:59:59.000Z

    This invention relates to a cylindrical, electron beam collector that efficiently couples the microwave energy out of a high power microwave source while stopping the attendant electron beam. The interior end walls of the collector are a pair of facing parabolic mirrors and the microwave energy from an input horn is radiated between the two mirrors and reassembled at the entrance to the output waveguide where the transmitted mode is reconstructed. The mode transmission through the collector of the present invention has an efficiency of at least 94%.

  2. Spectrally selective beam splitters designed to decouple quantum and thermal solar energy conversion in hybrid concentrating systems: Final report, Phase 1 and 2

    SciTech Connect (OSTI)

    Osborn, D.E.

    1988-06-01T23:59:59.000Z

    The technical feasibility and flexibility of developing elements that separate concentrated solar irradiation into specific spectral regions matched to specific photoquantum processes have been shown. These elements, spectrally selective beam splitters or filters, are designed to decouple quantum and thermal solar energy conversion in hybrid concentrating systems. Both interference filters and liquid absorption filters were investigated for use as spectrally selective beam splitters. Spectral selectivity is investigated for a variety of quantum systems with various spectral windows utilizing interference and absorption filters designed. Detailed analysis of one typical quantum system is provided consisting of a model of the silicon cell photovoltaic/photothermal hybrid system using spectral selectivity. The performance benefits of this approach are shown. Interference filters show the greatest flexibility and ability to match specific spectral windows. Liquid absorption filters appear to be a lower cost option, when an appropriate spectrally selective solution that can be used as a heat transfer fluid is available. 18 refs., 88 figs., 9 tabs.

  3. The Collector's Brotherhood Problem Using the Newman-Shepp Symbolic Method

    E-Print Network [OSTI]

    Foata, Dominique

    The Collector's Brotherhood Problem Using the Newman-Shepp Symbolic Method Dominique Foata,1 Doron collector's problem when the collector shares his harvest with his younger brothers. When the book of the p-th brother of the collector is completed, the books of the younger brothers have certain numbers of empty

  4. Realizing high-voltage thin film lateral bipolar transistors on SOI with a collector-tub

    E-Print Network [OSTI]

    Kumar, M. Jagadesh

    Realizing high-voltage thin film lateral bipolar transistors on SOI with a collector-tub Sukhendu-dimensional device simulation to examine the effect of a collector tub on the collector breakdown of the SOI based BJTs. This method involves creating a collector tub by etching the buried oxide followed by an n

  5. A Study of Concurrent Real-Time Garbage Collectors Filip Pizlo

    E-Print Network [OSTI]

    Rinetzky, Noam

    A Study of Concurrent Real-Time Garbage Collectors Filip Pizlo Purdue University West Lafayette at the microseconds level. Concurrent collectors also offer much better scalability over incremental collectors. The main prob- lem with concurrent real-time collectors is their complexity. The first concurrent real

  6. Type-Preserving Garbage Collectors Daniel C. Wang Andrew W. Appel

    E-Print Network [OSTI]

    Appel, Andrew W.

    Type-Preserving Garbage Collectors Daniel C. Wang Andrew W. Appel Department of Computer Science that acts as a tracing garbage collector for the program. Since the garbage collector is an explicit function, we do not need to provide a trusted garbage collector as a runtime service to manage memory

  7. The Collector's Brotherhood Problem Using the Newman-Shepp Symbolic Method

    E-Print Network [OSTI]

    Foata, Dominique

    The Collector's Brotherhood Problem Using the Newman-Shepp Symbolic Method Dominique Foata, 1 Doron coupon collector's problem when the collector shares his harvest with his younger brothers. When the book of the p-th brother of the collector is completed, the books of the younger brothers have certain numbers

  8. Debris and Radiation-Induced Damage Effects on EUV Nanolithography Source Collector Mirror Optics Performance

    E-Print Network [OSTI]

    Harilal, S. S.

    Debris and Radiation-Induced Damage Effects on EUV Nanolithography Source Collector Mirror Optics, Argonne, Illinois ABSTRACT Exposure of collector mirrors facing the hot, dense pinch plasma in plasma region of the lamp are known to induce serious damage to nearby collector mirrors. Candidate collector

  9. OMB Control # 0648-0376 Expires 2/29/2012 Fee Collector's Name

    E-Print Network [OSTI]

    OMB Control # 0648-0376 Expires 2/29/2012 Fee Collector's Name Mailing Address City State Zip Phone Number Fee Collector's Permit or Buyer Code Settlement Sheet Date Month and Year of Landings Contact the fee collector's name, address, telephone number, fee collector's permit number, date of this fee

  10. AQUIFER THERMAL ENERGY STORAGE

    E-Print Network [OSTI]

    Tsang, C.-F.

    2011-01-01T23:59:59.000Z

    or (2) from solar energy collectors, and to retrieve the hotof Hot Water from Solar Energy Collectors," Proceedings of

  11. Role of collector alternating charged patches on transport of...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    microsphere in 2-dimensional micromodels was studied. The cylindrical silica collectors within the micromodels were coated with 0, 10, 20, 50 and 100% Fe2O3 patches. The...

  12. High Performance Lateral Schottky Collector Bipolar Transistors on SOI

    E-Print Network [OSTI]

    Kumar, M. Jagadesh

    C-emitter lateral NPM Schottky collector transistor. To study the novel characteristics of these lateral Schottky junction of the proposed lateral PNM (NPM) transistor consists of a Schottky junction between N-base (P

  13. adsorbed unsaturated collector: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    25 Next Page Last Page Topic Index 221 Proposal and design of a new SiC-emitter lateral NPM Schottky collector bipolar transistor on Engineering Websites Summary: for VLSI...

  14. Positive electrode current collector for liquid metal cells

    DOE Patents [OSTI]

    Shimotake, Hiroshi (Hinsdale, IL); Bartholme, Louis G. (Joliet, IL)

    1984-01-01T23:59:59.000Z

    A current collector for the positive electrode of an electrochemical cell with a positive electrode including a sulfide. The cell also has a negative electrode and a molten salt electrolyte including halides of a metal selected from the alkali metals and the alkaline earth metals in contact with both the positive and negative electrodes. The current collector has a base metal of copper, silver, gold, aluminum or alloys thereof with a coating thereon of iron, nickel, chromium or alloys thereof. The current collector when subjected to cell voltage forms a sulfur-containing compound on the surface thereby substantially protecting the current collector from further attack by sulfur ions during cell operation. Both electroless and electrolytic processes may be used to deposit coatings.

  15. Positive-electrode current collector for liquid-metal cells

    DOE Patents [OSTI]

    Shimotake, H.; Bartholme, L.G.

    1982-09-27T23:59:59.000Z

    A current collector for the positive electrode of an electrochemical cell with a positive electrode including a sulfide. The cell also has a negative electrode and a molten salt electrolyte including halides of a metal selected from the alkali metals and the alkaline earth metals in contact with both the positive and negative electrodes. The current collector has a base metal of copper, silver, gold, aluminum or alloys thereof with a coating thereon of iron, nickel, chromium or alloys thereof. The current collector when subjected to cell voltage forms a sulfur-containing compound on the surface thereby substantially protecting the current collector from further attack by sulfur ions during cell operation. Both electroless and electrolytic processes may be used to deposit coatings.

  16. Project Profile: Advanced High Temperature Trough Collector Developmen...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    collector was selected for the Andasol 1 and 2 plants in Spain, the Kuraymat plant in Egypt, and early Solar Millennium commercial projects in the United States. The NTPro design...

  17. Effect of Thermal Annealing in Ammonia on the Properties of InGaN Nanowires with Different Indium Concentrations

    SciTech Connect (OSTI)

    Hahn, Cristopher; Cordones, Amy; Andrews, Sean; Gao, Hanwei; Fu, Anthony; Leone, Stephen; Yang, Peidong

    2012-10-02T23:59:59.000Z

    The utility of an annealing procedure in ammonia ambient is investigated for improving the optical characteristics of InxGa1?xN nanowires (0.07 ? x ? 0.42) grown on c-Al2O3 using a halide chemical vapor deposition method. Morphological studies using scanning electron microscopy confirm that the nanowire morphology is retained after annealing in ammonia at temperatures up to 800 ?C. However, significant indium etching and composition inhomogeneities are observed for higher indium composition nanowires (x = 0.28, 0.42), as measured by energy-dispersive X-ray spectroscopy and Z-contrast scanning transmission electron microscopy. Structural analyses, using X-ray diffraction and high-resolution transmission electron microscopy, indicate that this is a result of the greater thermal instability of higher indium composition nanowires. The effect of these structural changes on the optical quality of InGaN nanowires is examined using steady-state and time-resolved photoluminescence measurements. Annealing in ammonia enhances the integrated photoluminescence intensity of InxGa1?xN nanowires by up to a factor of 4.11 ? 0.03 (for x = 0.42) by increasing the rate of radiative recombination. Fitting of photoluminescence decay curves to a Kohlrausch stretched exponential indicates that this increase is directly related to a larger distribution of recombination rates from composition inhomogeneities caused by annealing. The results demonstrate the role of thermal instability on the improved optical properties of InGaN nanowires annealed in ammonia.

  18. High air volume to low liquid volume aerosol collector

    DOE Patents [OSTI]

    Masquelier, Donald A. (Tracy, CA); Milanovich, Fred P. (Lafayette, CA); Willeke, Klaus (Cincinnati, OH)

    2003-01-01T23:59:59.000Z

    A high air volume to low liquid volume aerosol collector. A high volume flow of aerosol particles is drawn into an annular, centripetal slot in a collector which directs the aerosol flow into a small volume of liquid pool contained is a lower center section of the collector. The annular jet of air impinges into the liquid, imbedding initially airborne particles in the liquid. The liquid in the pool continuously circulates in the lower section of the collector by moving to the center line, then upwardly, and through assistance by a rotating deflector plate passes back into the liquid at the outer area adjacent the impinging air jet which passes upwardly through the liquid pool and through a hollow center of the collector, and is discharged via a side outlet opening. Any liquid droplets escaping with the effluent air are captured by a rotating mist eliminator and moved back toward the liquid pool. The collector includes a sensor assembly for determining, controlling, and maintaining the level of the liquid pool, and includes a lower centrally located valve assembly connected to a liquid reservoir and to an analyzer for analyzing the particles which are impinged into the liquid pool.

  19. Development and analysis of a linearly segmented CPC collector for industrial steam generation

    SciTech Connect (OSTI)

    Figueroa, J.A.A.

    1980-06-01T23:59:59.000Z

    This study involves the design, analysis and construction of a modular, non-imaging, trough, concentrating solar collector for generation of process steam in a tropical climate. The most innovative feature of this concentrator is that the mirror surface consists of long and narrow planar segments placed inside sealed low-cost glass tubes. The absorber is a cylindrical fin inside an evacuated glass tube. As an extension of the same study, the optical efficiency of the segmented concentrator has been simulated by means of a Monte-Carlo Ray-Tracing program. Laser Ray-Tracing techniques were also used to evaluate the possibilities of this new concept. A preliminary evaluation of the experimental concentrator was done using a relatively simple method that combines results from two experimental measurements: overall heat loss coefficient and optical efficiency. A transient behaviour test was used to measure the overall heat loss coefficient throughout a wide range of temperatures.

  20. Analysis of concentrating PV-T systems for the commercial/industrial sector. Volume II. PV-T state-of-the-art survey and site/application pair selection and analysis

    SciTech Connect (OSTI)

    Schwinkendorf, W.E.

    1984-09-01T23:59:59.000Z

    As part of a project to develop feasibility assessments, design procedures, and reference designs for total energy systems that could use actively cooled concentrating photovoltaic collectors, a survey was conducted to provide an overview of available photovoltaic-thermal (PV-T) technology. General issues associated with the design and installation of a PV-T system are identified. Electrical and thermal efficiencies for the line-focus Fresnel, the linear parabolic trough, and the point-focus Fresnel collectors are specified as a function of operating temperature, ambient temperature, and insolation. For current PV-T technologies, the line-focus Fresnel collector proved to have the highest thermal and electrical efficiencies, lowest array cost, and lowest land area requirement. But a separate feasibility analysis involving 11 site/application pairs showed that for most applications, the cost of the photovoltaic portion of a PV-T system is not recovered through the displacement of an electrical load, and use of a thermal-only system to displace the thermal load would be a more economical alternative. PV-T systems are not feasible for applications that have a small thermal load, a large steam requirement, or a high load return temperature. SAND82-7157/3 identifies the technical issues involved in designing a photovoltaic-thermal system and provides guidance for resolving such issues. Detailed PV-T system designs for three selected applications and the results of a trade-off study for these applications are presented in SAND82-7157/4. A summary of the major results of this entire study and conclusions concerning PV-T systems and applications is presented in SAND82-7157/1.

  1. Thermal performance of the Brookhaven natural thermal storage house

    SciTech Connect (OSTI)

    Ghaffari, H.T.; Jones, R.F.

    1981-01-01T23:59:59.000Z

    In the Brookhaven natural thermal storage house, an energy-efficient envelope, passive solar collectors, and a variety of energy conservation methods are incorporated. The thermal characteristics of the house during the tested heating season are evaluated. Temperature distributions at different zones are displayed, and the effects of extending heating supply ducts only to the main floor and heating return ducts only from the second floor are discussed. The thermal retrievals from the structure and the passive collectors are assessed, and the total conservation and passive solar contributions are outlined. Several correlation factors relating these thermal behaviors are introduced, and their diurnal variations are displayed. Finally, the annual energy requirements, and the average load factors are analyzed and discussed.

  2. Colloid deposition on non-ideal porous media: The influences of collector shape and roughness on the single-collector efficiency

    E-Print Network [OSTI]

    Saiers, James

    Colloid deposition on non-ideal porous media: The influences of collector shape and roughness on the single-collector efficiency James E. Saiers School of Environmental Studies, Yale University, New Haven changes in mineral-grain shape and surface roughness influence the single-collector contact efficiency (h

  3. Planar micro-optic solar concentration

    E-Print Network [OSTI]

    Karp, Jason Harris

    2010-01-01T23:59:59.000Z

    12] A.Rabl, Active Solar Collectors and Their Applications (23, A.Rabl, Active Solar Collectors and Their Applications (Rabl, A. , [Active Solar Collectors and Their Applications],

  4. Evacuated-Tube Heat-Pipe Solar Collectors Applied to the Recirculation Loop in a Federal Building: Preprint

    SciTech Connect (OSTI)

    Walker, A.; Mahjouri, F.; Stiteler, R.

    2004-06-01T23:59:59.000Z

    This paper describes the design, simulation, construction, and initial performance of a solar water heating system (a 360-tube evacuated-tube heat-pipe solar collector, 54 m2 in gross area, 36 m2 in net absorber area) installed at the top of the hot water recirculation loop in the Social Security Administration's Mid-Atlantic Center in Philadelphia. When solar energy is available, water returning to the hot water storage tank is heated by the solar array. This new approach, in contrast to the more conventional approach of preheating incoming water, is made possible by the thermal diode effect of heat pipes and low heat loss from evacuated-tube solar collectors. The simplicity of this approach and its low installation costs support the deployment of solar energy in existing commercial buildings, especially where the roof is some distance away from the water heating system, which is often in the basement. Initial performance measurements of the system are reported.

  5. Approximation Theorems Related to the Coupon Collector's Problem

    E-Print Network [OSTI]

    Pósfai, Anna

    2010-01-01T23:59:59.000Z

    This Ph.D. thesis concerns the version of the classical coupon collector's problem, when a collector samples with replacement a set of $n\\ge 2$ distinct coupons so that at each time any one of the $n$ coupons is drawn with the same probability $1/n$. For a fixed integer $m\\in\\{0,1,\\ldots,n-1\\}$, the coupon collector's waiting time $W_{n,m}$ is the random number of draws the collector performs until he acquires $n-m$ distinct coupons for the first time. The basic goal of the thesis is to approximate the distribution of the coupon collector's appropriately centered and normalized waiting time with well-known measures with high accuracy, and in many cases prove asymptotic expansions for the related probability distribution functions and mass functions. The approximating measures are chosen from five different measure families. Three of them -- the Poisson distributions, the normal distributions and the Gumbel-like distributions -- are probability measure families whose members occur as limiting laws in the limit...

  6. Measuring overall emittance of concentrator receiver pipes

    SciTech Connect (OSTI)

    Gerich, J.W.; Reitter, T.A.; Merriam, M.F.

    1980-03-01T23:59:59.000Z

    A simple and accurate method for measuring the overall emittance of receiver pipes used with cylindrical concentrators is described. Experimental measurements obtained for steel pipes with a black chrome over nickel selective surface are presented. The observed strong temperature dependence of emittance indicates that the use of room temperature emittance data will substantially overestimate collector efficiency. (SPH)

  7. MERCURY CONTROL WITH ADVANCED HYBRID PARTICULATE COLLECTOR

    SciTech Connect (OSTI)

    Ye Zhuang; Stanley J. Miller

    2005-05-01T23:59:59.000Z

    This project was awarded under U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) Program Solicitation DE-PS26-00NT40769 and specifically addressed Technical Topical Area 4-Testing Novel and Less Mature Control Technologies on Actual Flue Gas at the Pilot Scale. The project team included the Energy & Environmental Research Center (EERC) as the main contractor; W.L. Gore & Associates, Inc., as a technical and financial partner; and the Big Stone Power Plant operated by Otter Tail Power Company, host for the field-testing portion of the research. Since 1995, DOE has supported development of a new concept in particulate control called the advanced hybrid particulate collector (AHPC). The AHPC has been licensed to W.L. Gore & Associates, Inc., and has been marketed as the Advanced Hybrid{trademark} filter by Gore. The Advanced Hybrid{trademark} filter combines the best features of electrostatic precipitators (ESPs) and baghouses in a unique configuration, providing major synergism between the two collection methods, both in the particulate collection step and in the transfer of dust to the hopper. The Advanced Hybrid{trademark} filter provides ultrahigh collection efficiency, overcoming the problem of excessive fine-particle emissions with conventional ESPs, and it solves the problem of reentrainment and re-collection of dust in conventional baghouses. The Advanced Hybrid{trademark} filter also appears to have unique advantages for mercury control over baghouses or ESPs as an excellent gas--solid contactor. The objective of the project was to demonstrate 90% total mercury control in the Advanced Hybrid{trademark} filter at a lower cost than current mercury control estimates. The approach included bench-scale batch tests, larger-scale pilot testing with real flue gas on a coal-fired combustion system, and field demonstration at the 2.5-MW (9000-acfm) scale at a utility power plant to prove scale-up and demonstrate longer-term mercury control. An additional task was included in this project to evaluate mercury oxidation upstream of a dry scrubber by using mercury oxidants. This project demonstrated at the pilot-scale level a technology that provides a cost-effective technique to control mercury and, at the same time, greatly enhances fine particulate collection efficiency. The technology can be used to retrofit systems currently employing inefficient ESP technology as well as for new construction, thereby providing a solution for improved fine particulate control combined with effective mercury control for a large segment of the U.S. utility industry as well as other industries.

  8. Absorber Alignment Measurement Tool for Solar Parabolic Trough Collectors: Preprint

    SciTech Connect (OSTI)

    Stynes, J. K.; Ihas, B.

    2012-04-01T23:59:59.000Z

    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.

  9. Brief Communication Carbon nanotubes as nanoparticles collector

    E-Print Network [OSTI]

    in length) were grown by thermal CVD at 923 K in a 7 v/v% C2H2 in N2 mixture on electroless nickel were grown on nickel-coated TEM copper grids of 300 mesh and on Monel

  10. Solar energy concentrating and collecting arrangement

    SciTech Connect (OSTI)

    Barr, I.R.

    1986-07-29T23:59:59.000Z

    A solar energy concentrating and collecting arrangement is described comprising a generally upwardly facing concave generally partial cylindrical trough reflector fixedly positioned during operational reflection and having three radii, each radius forming an effective overall arc segment along the effective partial cylindrical length of the relector, the center of the radius of each radii lying on a respective axis line extending along the longitudinal extent of the partial cylindrical trough reflector, and a collector having a longitudinal extent extending along the length of the reflector and disposed in parallel spaced relation from the effective reflecting surface of the reflector and movable support means movably supporting the collector for movement transversely of its longitudinal extent across a portion of the arcuate width of the reflector to enable selected positioning of the collector at varied lateral positions across the width of the reflector as a function of sun angle of elevation for maximizing pickup of reflected solar energy from the operationally fixed position reflector.

  11. Fuel cell collector plate and method of fabrication

    DOE Patents [OSTI]

    Braun, James C. (Juno Beach, FL); Zabriskie, Jr., John E. (Port St. Lucie, FL); Neutzler, Jay K. (Palm Beach Gardens, FL); Fuchs, Michel (Boynton Beach, FL); Gustafson, Robert C. (Palm Beach Gardens, FL)

    2001-01-01T23:59:59.000Z

    An improved molding composition is provided for compression molding or injection molding a current collector plate for a polymer electrolyte membrane fuel cell. The molding composition is comprised of a polymer resin combined with a low surface area, highly-conductive carbon and/or graphite powder filler. The low viscosity of the thermoplastic resin combined with the reduced filler particle surface area provide a moldable composition which can be fabricated into a current collector plate having improved current collecting capacity vis-a-vis comparable fluoropolymer molding compositions.

  12. Evaluation of Collector Well Configurations to Model Hydrodynamics in Riverbank Filtration and Groundwater Remediation

    E-Print Network [OSTI]

    De Leon, Tiffany Lucinda

    2011-10-21T23:59:59.000Z

    Collector well designs are necessary to maximize groundwater uptake and riverbank filtration without negatively impacting an aquifer. Unfortunately, there is a lack of information and research regarding the implementation of collector well design...

  13. Experiments and Models Bearing on the Role of Chromite as a Collector of Platinum Group

    E-Print Network [OSTI]

    Mcdonough, William F.

    Experiments and Models Bearing on the Role of Chromite as a Collector of Platinum Group Minerals PUBLICATION SEPTEMBER 6, 2008 Chromite is widely recognized to act as a collector for platinum group elements

  14. How Many Singles, Doubles, Triples, Etc., Should The Coupon Collector Expec* Doron ZEILBERGER 1

    E-Print Network [OSTI]

    Zeilberger, Doron

    How Many Singles, Doubles, Triples, Etc., Should The Coupon Collector Expec* *t* * is well known and easy to see that a collector should expect to buy m(1+1=2+1=3+. .+.1=m) gums

  15. UIUC Collector Erosion and Optical Lifetime Project Results: Time Dependent Exposures

    E-Print Network [OSTI]

    Spila, Timothy P.

    UIUC Collector Erosion and Optical Lifetime Project Results: Time Dependent Exposures Darren A is the lifetime of collector optics. Frequent replacement of the mirror system will detract from the economic

  16. OMB Control # 0648-0376 Expires 2/29/2012 Fee Collector's Name

    E-Print Network [OSTI]

    OMB Control # 0648-0376 Expires 2/29/2012 Fee Collector's Name Mailing Address City State Zip Phone BBGS-001WS 1.50 Total Fees ($) Fee Adjustment Instructions: 1. Complete the fee collector's name

  17. OMB Control # 0648-0376 Expires 2/29/2012 Fee Collector's Name

    E-Print Network [OSTI]

    OMB Control # 0648-0376 Expires 2/29/2012 Fee Collector's Name Mailing Address City State Zip Phone Verification: Instructions: 1. Complete the fee collector's name, address, phone number, crab receiver permit

  18. Efficient solar cooling: first ever non-tracking solar collectors powering a double effect absorption chiller

    E-Print Network [OSTI]

    Poiry, Heather Marie

    2011-01-01T23:59:59.000Z

    Cooling: First Ever Non-tracking solar collectors powering aCooling: First Ever Non-tracking solar collectors powering athe first ever non-tracking solar powered double effect

  19. Efficient solar cooling: first ever non-tracking solar collectors powering a double effect absorption chiller

    E-Print Network [OSTI]

    Poiry, Heather Marie

    2011-01-01T23:59:59.000Z

    collector, and to the right is a standard evacuated solar tube system.. 12 Figure 3: Left is a linear Fresnel

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

    SciTech Connect (OSTI)

    Not Available

    2012-08-01T23:59:59.000Z

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

  1. Degradation of parabolic-cylindrical solar collector performance: receiver misalignments and tracking inaccuracies

    SciTech Connect (OSTI)

    Ratzel, A.C.

    1986-01-01T23:59:59.000Z

    Studies were conducted to determine the performance of a 2-m, 90/sup 0/ E-W oriented solar reflector trough and a receiver assembly consisting of a receiver tube surrounded by a concentric outer glass envelope. Three receiver tube diameters (2.223, 2.54, and 3.175 cm o.d. tubes) were analyzed subject to a variety of collector errors including receiver misalignments and tracking bias, to assess the detrimental effects of these problems. Of the possible problems considered, it was shown that a misalignment of the receiver assembly above the focal plane is most critical, since the absorbed solar fluxes are concentrated near the base of the tube, leading to possible ''hot spots.'' In addition, as a result of this work, it was shown that the intermediate receiver tube size (2.54 cm o.d.) should be used with the 2-m reflector trough, so long as small errors and misalignments are expected.

  2. Design and optimization of a 200 GHz SiGe HBT collector profile by TCAD

    E-Print Network [OSTI]

    Rieh, Jae-Sung

    Design and optimization of a 200 GHz SiGe HBT collector profile by TCAD Andreas D. Strickera A novel simulation assisted investigation was used to obtain the optimum collector design of a 200 GHz; BJT; Collector doping profile; TCAD; Design methodology 1. Introduction The continuing trend toward

  3. Immix: A Mark-Region Garbage Collector with Space Efficiency, Fast Collection, and Mutator Performance

    E-Print Network [OSTI]

    McKinley, Kathryn S.

    Immix: A Mark-Region Garbage Collector with Space Efficiency, Fast Collection, and Mutator. The garbage collector therefore directly deter- mines program performance by making a classic space-time trade canonical tracing garbage collectors: semi-space, mark-sweep, and mark-compact each sacrifice one ob

  4. Characterization of collector optic material samples before and after exposure in LPP and DPP EUV sources

    E-Print Network [OSTI]

    Spila, Timothy P.

    Characterization of collector optic material samples before and after exposure in LPP and DPP EUV reports on part of the Collector Lifetime and Erosion Project at the University of Illinois at Urbana collector optic in commercial EUV sources to ascertain the fundamental erosion processes and critical

  5. iU/riA ii riA Background and Technical Information for Collectors

    E-Print Network [OSTI]

    m^ m im^Hii iU/riA ii riA Background and Technical Information for Collectors mmBiological Laboial Circular 111 #12;#12;DUCK STAMP DATA Background and Technical Information for Collectors By Edna N. Sater and conservationists, it aroused widespread interest among stamp collectors, many of whom had not previously collected

  6. THE WEIGHTED WORDS COLLECTOR JEREMIE DU BOISBERRANGER, DANI`ELE GARDY, AND YANN PONTY

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    THE WEIGHTED WORDS COLLECTOR J´ER´EMIE DU BOISBERRANGER, DANI`ELE GARDY, AND YANN PONTY Abstract. Motivated by applications in bioinformatics, we consider the word collector problem, i.e. the expected is obtained. The originality of this instance of the non-uniform coupon collector lies in the, potentially

  7. Collector Receiver Design for Data Collection and Localization in Sensor-driven Networks

    E-Print Network [OSTI]

    Madhow, Upamanyu

    Collector Receiver Design for Data Collection and Localization in Sensor-driven Networks Bharath is communicating, falls on a network of collector nodes which are perpetually monitoring transmissions from with minimal capabilities, while shifting the complexity to a network of collector nodes. While the philosophy

  8. Characterization of collector optic material samples before and after exposure in laser

    E-Print Network [OSTI]

    Spila, Timothy P.

    Characterization of collector optic material samples before and after exposure in laser produced: collector optics; EUV; laser produced plasma; discharge produced plasma; erosion; debris mitigation. Paper of the Collector Lifetime and Erosion Project at the University of Illinois at Urbana- Champaign UIUC ,1

  9. TITLE: Preliminary Examination of Impact Craters on Al Foil from the Stardust Interstellar Dust Collector

    E-Print Network [OSTI]

    the Stardust Interstellar Dust Collector SESSION TYPE: Poster; SESSION TITLE: P43A. Extraterrestrial Dust@home dusters ABSTRACT BODY: The Interstellar Dust Collector from the NASA Stardust mission provides) stream in order to obtain such information as grain composition and microstructure. The collector

  10. Plan for Can Collectors on UBC Campus PLAN 503: Assignment 2

    E-Print Network [OSTI]

    Plan for Can Collectors on UBC Campus PLAN 503: Assignment 2 School of Community and Regional to the issue of can collectors or "binners" on UBC campus. The research is part of a longer plan, which necessity as their primary motivation. According to interviews to some can collectors in Vancouver, major

  11. A Study of the Scalability of Stop-the-world Garbage Collectors on Multicores

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A Study of the Scalability of Stop-the-world Garbage Collectors on Multicores Lokesh Gidra, Ga challenges for garbage collectors (GCs). In particular, throughput-oriented stop- the-world algorithms-oriented garbage collector of OpenJDK 7, called Parallel Scavenge. We identify its bottlenecks, and show how

  12. Handles Revisited: Optimising Performance and Memory Costs in a Real-Time Collector

    E-Print Network [OSTI]

    Kent, University of

    Handles Revisited: Optimising Performance and Memory Costs in a Real-Time Collector Tomas Kalibera garbage collectors must update all references to ob- jects they move. Updating is a lengthy operation references have been updated which, in a real-time collector, must be done incrementally. One solution

  13. NON-RANDOM SPATIAL DISTRIBUTION OF IMPACTS IN THE STARDUST COMETARY COLLECTOR. Andrew J. Westphal1

    E-Print Network [OSTI]

    NON-RANDOM SPATIAL DISTRIBUTION OF IMPACTS IN THE STARDUST COMETARY COLLECTOR. Andrew J. Westphal1/Wild2[1] at a relative speed of 6.1 km sec-1 . Cometary dust was collected at in a 0.1 m2 collector to earth and were recovered. We report the discovery that impacts in the Stardust cometary collector

  14. Effect of collector lateral scaling on performance of high-speed SiGe HBTs

    E-Print Network [OSTI]

    Rieh, Jae-Sung

    Effect of collector lateral scaling on performance of high-speed SiGe HBTs with fT > 300 GHz J.-S. Rieh, M. Khater, A. Jeseph, G. Freeman and D. Ahlgren The effect of collector lateral scaling followed by a degradation with decreasing collector width. Possible causes behind the observed trend

  15. A Lock-Free, Concurrent, and Incremental Stack Scanning for Garbage Collectors

    E-Print Network [OSTI]

    Petrank, Erez

    A Lock-Free, Concurrent, and Incremental Stack Scanning for Garbage Collectors Gabriel Kliot Bjarne.Steensgaard@microsoft.com Abstract Two major efficiency parameters for garbage collectors collectors with as short as possible pause times. Pause lengths have decreased significantly during the years

  16. CBC Reduction in InP Heterojunction Bipolar Transistor with Selectively Implanted Collector Pedestal

    E-Print Network [OSTI]

    Rodwell, Mark J. W.

    CBC Reduction in InP Heterojunction Bipolar Transistor with Selectively Implanted Collector-3812 Fax: (805) 893-8714 Email: yingda@ece.ucsb.edu The base-collector junction capacitance (Cbc) is a key with a collector pedestal under the HBT's intrinsic region by using selective ion implantation and MBE regrowth

  17. Converting PETAL, the 25m solar collector, into an astronomical research facility

    E-Print Network [OSTI]

    Ribak, Erez

    1 Converting PETAL, the 25m solar collector, into an astronomical research facility Erez N. Ribak and Astronomy, Tel Aviv University, Israel ABSTRACT We propose to modify the solar collector PETAL (Photon, and using fibre optics to combine the light at a common focus. Keywords: Solar collectors, Large telescopes

  18. THE GENESIS SOLAR-WIND COLLECTOR MATERIALS A. J. G. Jurewicz1

    E-Print Network [OSTI]

    THE GENESIS SOLAR-WIND COLLECTOR MATERIALS A. J. G. Jurewicz1 , D. S. Burnett2 , R. C. Wiens3 , T. #12;THE GENESIS SOLAR-WIND COLLECTOR MATERIALS Abstract. Genesis (NASA Discovery Mission #5) is a sample return mission. Collectors comprised of ultra-high purity materials will be exposed to the solar

  19. Use of Renewable Energy in Buildings: Experiences With Solar Thermal Utilization

    E-Print Network [OSTI]

    Wang, R.; Zhai, X.

    2006-01-01T23:59:59.000Z

    collectors on the south tilted roofs, south walls, balconies or awnings. Experiences on solar thermal utilization are mainly introduced in this paper, which include solar hot water systems with different design methods in residential buildings and solar-powered...

  20. Inverse Marx modulators for self-biasing klystron depressed collectors

    SciTech Connect (OSTI)

    Kemp, Mark A. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

    2014-08-28T23:59:59.000Z

    A novel pulsed depressed collector biasing scheme is proposed. This topology feeds forward energy recovered during one RF pulse for use on the following RF pulse. The presented ''inverse'' Marx charges biasing capacitors in series, and discharges them in parallel. Simulations are shown along with experimental demonstration on a 62kW klystron.

  1. Comparative efficiencies of solar energy collectors Laboratoire de Technologie Optique

    E-Print Network [OSTI]

    Boyer, Edmond

    57 Comparative efficiencies of solar energy collectors M. Duban Laboratoire de Technologie Optique the solar energy during a day or a year, independant of their dimensions, the amount of energy collected seuils K = 0 et K = 0,5 (K étant le rapport entre 1'energie minimum nécessaire pour un fonctionnement

  2. Integrating Generations with Advanced Reference Counting Garbage Collectors

    E-Print Network [OSTI]

    Krintz, Chandra

    Integrating Generations with Advanced Reference Counting Garbage Collectors Hezi Azatchi 1 and Erez counting work on the old generation (where many objects survive). Matching the expected survival rate a couple of milliseconds. Keywords: Runtime systems, Memory management, Garbage collection, Genera- tional

  3. A Linear Parabolic Trough Solar Collector Performance Model 

    E-Print Network [OSTI]

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

    2006-01-01T23:59:59.000Z

    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....

  4. Steady state and transient model of a linear solar concentrator with cylindrical absorber

    SciTech Connect (OSTI)

    Ecevit, A.

    1980-12-01T23:59:59.000Z

    A linear parabolic collector with integrated absorber pipe assembly is one of the main elements of a solar energy collection system that produces electricity or process heat. This kind of a system must geometrically and thermally be optimized so that a reasonable operating efficiency can be reached. A linear parabolic collector having an absorber, encircled with a cylindrical cavity, has been studied and the geometrical parameters of the system have been optimized before the collector was built and put into operation. The collector having dimensions of 200X95 sq.cm and having a focal length of 60 cm. is built under the view of the optimization procedure. The collector is oriented EW horizontal in the NS tracking mode and the longitudinal deviations of the focal line is examined. The energy distribution along the focal line of the collector is measured using a laser together with a wattmeter. The effects of the thermal and optical parameters on the performance of the system is studied by the use of a theoretical model that is built for the collector absorber system. The value of each parameter is changed from a minimum to a maximum, keeping the other parameters at their average values.

  5. Transpired Solar Collector - Energy Innovation Portal

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over OurThe Iron Spin Transition in2, 2003Tool ofTopoCarbon|defaultSolar Thermal Solar

  6. Standard test method for determination of uranium or plutonium isotopic composition or concentration by the total evaporation method using a thermal ionization mass spectrometer

    E-Print Network [OSTI]

    American Society for Testing and Materials. Philadelphia

    2007-01-01T23:59:59.000Z

    1.1 This method describes the determination of the isotopic composition and/or the concentration of uranium and plutonium as nitrate solutions by the thermal ionization mass spectrometric (TIMS) total evaporation method. Purified uranium or plutonium nitrate solutions are loaded onto a degassed metal filament and placed in the mass spectrometer. Under computer control, ion currents are generated by heating of the filament(s). The ion beams are continually measured until the sample is exhausted. The measured ion currents are integrated over the course of the run, and normalized to a reference isotope ion current to yield isotopic ratios. 1.2 In principle, the total evaporation method should yield isotopic ratios that do not require mass bias correction. In practice, some samples may require this bias correction. When compared to the conventional TIMS method, the total evaporation method is approximately two times faster, improves precision from two to four fold, and utilizes smaller sample sizes. 1.3 The tot...

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

    SciTech Connect (OSTI)

    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

    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.

  8. Pv-Thermal Solar Power Assembly

    DOE Patents [OSTI]

    Ansley, Jeffrey H. (El Cerrito, CA); Botkin, Jonathan D. (El Cerrito, CA); Dinwoodie, Thomas L. (Piedmont, CA)

    2001-10-02T23:59:59.000Z

    A flexible solar power assembly includes a flexible photovoltaic device attached to a flexible thermal solar collector. The solar power assembly can be rolled up for transport and then unrolled for installation on a surface, such as the roof or side wall of a building or other structure, by use of adhesive and/or other types of fasteners.

  9. Spray drift collector efficiency: Assessment of deposition on 2 mm diameter PVC line in a wind tunnel

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Spray drift collector efficiency: Assessment of deposition on 2 mm diameter PVC line in a wind and Miller and Hadfield, 1989) and to trap it on passive collectors. This method is cheap and easy to set-up but the efficiency of the collectors has to be evaluated. The cylindrical collectors with a diameter of 2 mm

  10. Virtual Laboratories > 12. Finite Sampling Models > 1 2 3 4 5 6 7 8 9 7. The Coupon Collector Problem

    E-Print Network [OSTI]

    Demeio, Lucio

    Virtual Laboratories > 12. Finite Sampling Models > 1 2 3 4 5 6 7 8 9 7. The Coupon Collector of a coupon collector: each time the collector buys a certain product (bubble gum or Cracker Jack, for example} In terms of the coupon collector, this random variable gives the number of products required to get k

  11. Experimental investigation and modeling of a direct-coupled PV/T air collector

    SciTech Connect (OSTI)

    Shahsavar, A.; Ameri, M. [Department of Mechanical Engineering, Faculty of Engineering, Shahid Bahonar University, Kerman (Iran, Islamic Republic of); Energy and Environmental Engineering Research Center, Shahid Bahonar University, Kerman (Iran, Islamic Republic of)

    2010-11-15T23:59:59.000Z

    Photovoltaic/thermal (PV/T) systems refer to the integration of photovoltaic and solar thermal technologies into one single system, in that both useful heat energy and electricity are produced. The impetus of this paper is to model a direct-coupled PV/T air collector which is designed, built, and tested at a geographic location of Kerman, Iran. In this system, a thin aluminum sheet suspended at the middle of air channel is used to increase the heat exchange surface and consequently improve heat extraction from PV panels. This PV/T system is tested in natural convection and forced convection (with two, four and eight fans operating) and its unsteady results are presented in with and without glass cover cases. A theoretical model is developed and validated against experimental data, where good agreement between the measured values and those calculated by the simulation model were achieved. Comparisons are made between electrical performance of the different modes of operation, and it is concluded that there is an optimum number of fans for achieving maximum electrical efficiency. Also, results show that setting glass cover on photovoltaic panels leads to an increase in thermal efficiency and decrease in electrical efficiency of the system. (author)

  12. Recycling of wasted energy : thermal to electrical energy conversion

    E-Print Network [OSTI]

    Lim, Hyuck

    2011-01-01T23:59:59.000Z

    heat source can be solar thermal energy, biological thermaland concentrated solar thermal energy farms. They demandsources include solar thermal energy, geo-thermal energy,

  13. Two-axis tracking solar collector mechanism

    DOE Patents [OSTI]

    Johnson, Kenneth C. (201 W. California Ave., #401, Sunnyvale, CA 94086)

    1990-01-01T23:59:59.000Z

    This invention is a novel solar tracking mechanism incorporating a number of practical features that give it superior environmental resilience and exceptional tracking accuracy. The mechanism comprises a lightweight space-frame assembly supporting an array of point-focus Fresnel lenses in a two-axis tracking structure. The system is enclosed under a glass cover which isolates it from environmental exposure and enhances tracking accuracy by eliminating wind loading. Tracking accuracy is also enhanced by the system's broad-based tracking support. The system's primary intended application would be to focus highly concentrated sunlight into optical fibers for transmission to core building illumination zones, and the system may also have potential for photovoltaic or photothermal solar energy conversion.

  14. Two-axis tracking solar collector mechanism

    DOE Patents [OSTI]

    Johnson, Kenneth C. (201 W. California Ave. #705, Sunnyvale, CA 94086)

    1992-01-01T23:59:59.000Z

    This invention is a novel solar tracking mechanism incorporating a number of practical features that give it superior environmental resilience and exceptional tracking accuracy. The mechanism comprises a lightweight space-frame assembly supporting an array of point-focus Fresnel lenses in a two-axis tracking structure. The system is enclosed under a glass cover which isolates it from environmental exposure and enhances tracking accuracy by eliminating wind loading. Tracking accuracy is also enhanced by the system's broad-based tracking support. The system's primary intended application would be to focus highly concentrated sunlight into optical fibers for transmission to core building illumination zones, and the system may also have potential for photovoltaic or photothermal solar energy conversion.

  15. Two-axis tracking solar collector mechanism

    DOE Patents [OSTI]

    Johnson, K.C.

    1992-12-08T23:59:59.000Z

    This invention is a novel solar tracking mechanism incorporating a number of practical features that give it superior environmental resilience and exceptional tracking accuracy. The mechanism comprises a lightweight space-frame assembly supporting an array of point-focus Fresnel lenses in a two-axis tracking structure. The system is enclosed under a glass cover which isolates it from environmental exposure and enhances tracking accuracy by eliminating wind loading. Tracking accuracy is also enhanced by the system's broad-based tracking support. The system's primary intended application would be to focus highly concentrated sunlight into optical fibers for transmission to core building illumination zones, and the system may also have potential for photovoltaic or photothermal solar energy conversion. 16 figs.

  16. Markov Modeling of Cooperative Multiplayer Coupon Collectors' Problems

    E-Print Network [OSTI]

    Rovatti, R; Mazzini, G

    2009-01-01T23:59:59.000Z

    The paper introduces a modified version of the classical Coupon Collector's Problem entailing exchanges and cooperation between multiple players. Results of the development show that, within a proper Markov framework, the complexity of the Cooperative Multiplayer Coupon Collectors' Problem can be attacked with an eye to the modeling of resource harvesting and sharing within the context of Next Generation Network. The cost of cooperation is computed in terms of exchange protocol burden and found to be dependent on only ensemble parameters such as the number of players and the number of coupons but not on the detailed collection statistics. The benefits of cooperation are quantified in terms of reduction of the average number of actions before collection completion.

  17. Materials selection for the US INTOR divertor collector plate

    SciTech Connect (OSTI)

    Mattas, R.F.; Misra, B.; Smith, D.L.; Morgan, G.D.; Delaney, M.; Gold, R.

    1981-01-01T23:59:59.000Z

    The divertor collector plate in the INTOR reactor will be subjected to high heat, particle, and neutron fluxes, making it the most severely damaged torus component. The collector plate is composed of a protection plate, which is directly exposed to the particle flux, and a heat sink which provides support for the protection plate and carries the water coolant. The high-Z refractory metals have been considered for use as the protection plate material, and austenitic stainless steels and copper alloys have been considered as the heat sink material. Tungsten and Type 316 stainless steels have been selected for the protection plate and heat sink, respectively. The protection plate has a sputtering lifetime of 1.75 y at a 50% duty factor, while the heat sink is expected to last the lifetime of the reactor.

  18. Lightweight diaphragm mirror module system for solar collectors

    DOE Patents [OSTI]

    Butler, Barry L. (Golden, CO)

    1985-01-01T23:59:59.000Z

    A mirror module system is provided for accurately focusing solar radiation on a point or a line as defined by an array of solar collectors. Each mirror module includes a flexible membrane stretched over a frame in a manner similar to that of a drum or a trampoline and further includes a silvered glass or plastic mirror for forming an optical reflecting surface. The configuration of the optical reflecting surface is variably adjustable to provide for the accurate focusing of the solar energy on a given collector array, e.g., a point or a linear array arrangement. The flexible mirror-membrane combination is lightweight to facilitate installation and reduce system cost yet structurally strong enough to provide for the precise focusing of the incident solar radiation in a semi-rigid reflector system in which unwanted reflector displacement is minimized.

  19. Lightweight diaphragm mirror module system for solar collectors

    DOE Patents [OSTI]

    Butler, B.L.

    1984-01-01T23:59:59.000Z

    A mirror module system is provided for accurately focusing solar radiation on a point or a line as defined by an array of solar collectors. Each mirror module includes a flexible membrane stretched over a frame in a manner similar to that of a drum or a trampoline and further includes a silvered glass or plastic mirror for forming an optical reflecting surface. The configuration of the optical reflecting surface is variably adjustable to provide for the accurate focusing of the solar energy on a given collector array, e.g., a point or a linear array arrangement. The flexible mirror-membrane combination is lightweight to facilitate installation and reduce system cost yet structurally strong enough to provide for the precise focusing of the incident solar radiation in a semi-rigid reflector system in which unwanted reflector displacement is minimized.

  20. Dual Band Electrodes in Generator-Collector Mode: Simultaneous Measurement of Two Species

    E-Print Network [OSTI]

    Barnes, Edward O; Dale, Sara E C; Marken, Frank; Compton, Richard G

    2013-01-01T23:59:59.000Z

    A computational model for the simulation of a double band collector-generator experiment is applied to the situation where two electrochemical reactions occur concurrently. It is shown that chronoamperometric measurements can be used to take advantage of differences in diffusion coefficients to measure the concentrations of both electroactive species simultaneously, by measuring the time at which the collection efficiency reaches a specific value. The separation of the electrodes is shown to not affect the sensitivity of the method (in terms of percentage changes in the measured time to reach the specified collection efficiency), but wider gaps can provide a greater range of (larger) absolute values of this characteristic time. It is also shown that measuring the time taken to reach smaller collection efficiencies can allow for the detection of smaller amounts of whichever species diffuses faster. The case of a system containing both ascorbic acid and opamine in water is used to exemplify the method, and it i...

  1. Multi-stage depressed collector for small orbit gyrotrons

    DOE Patents [OSTI]

    Singh, A.; Ives, R.L.; Schumacher, R.V.; Mizuhara, Y.M.

    1998-07-14T23:59:59.000Z

    A multi-stage depressed collector for receiving energy from a small orbit gyrating electron beam employs a plurality of electrodes at different potentials for sorting the individual electrons on the basis of their total energy level. Magnetic field generating coils, for producing magnetic fields and magnetic iron for magnetic field shaping produce adiabatic and controlled non-adiabatic transitions of the incident electron beam to further facilitate the sorting. 9 figs.

  2. Multi-stage depressed collector for small orbit gyrotrons

    DOE Patents [OSTI]

    Singh, Amarjit (Greenbelt, MD); Ives, R. Lawrence (Saratoga, CA); Schumacher, Richard V. (Campbell, CA); Mizuhara, Yosuke M. (Palo Alto, CA)

    1998-01-01T23:59:59.000Z

    A multi-stage depressed collector for receiving energy from a small orbit gyrating electron beam employs a plurality of electrodes at different potentials for sorting the individual electrons on the basis of their total energy level. Magnetic field generating coils, for producing magnetic fields and magnetic iron for magnetic field shaping produce adiabatic and controlled non-adiabatic transitions of the incident electron beam to further facilitate the sorting.

  3. Optimization of a hybrid solar energy collector system 

    E-Print Network [OSTI]

    Shinkman, Alan M.

    1981-01-01T23:59:59.000Z

    OPTIMIZATION OF A HYBRID SOLAR ENERGY COLLECTOR SYSTEM A Thesis by ALAN M. SHI NEMAN Submitted to the Graduate College of Texas A&N University in partial fulfillment of the requirement for the degree MASTER OF SCIENCE May 1981 Major Subject... the investment tax credit for farm and ranch operations, 5) establishing a progressive property tax, 6) making certain forms of vertical integration in agriculture a violation of anti-trust laws, 7) prohibiting foreign ownership of farmland, and 8) limiting...

  4. Optimization of a hybrid solar energy collector system

    E-Print Network [OSTI]

    Shinkman, Alan M.

    1981-01-01T23:59:59.000Z

    OPTIMIZATION OF A HYBRID SOLAR ENERGY COLLECTOR SYSTEM A Thesis by ALAN M. SHI NEMAN Submitted to the Graduate College of Texas A&N University in partial fulfillment of the requirement for the degree MASTER OF SCIENCE May 1981 Major Subject...: (Chairman of Committee) (Member) (Member) (Me et) (Head o Department) May 1981 wmezg ABSTRACT The Structural Impact of Commodity Farm Programs on Farms in the Southern Texas High Plains. (May 1981) Christina Ray Shirley, B. S. , Illinois State...

  5. Assessment of existing studies of wind loading on solar collectors

    SciTech Connect (OSTI)

    Murphy, L. M.

    1981-02-01T23:59:59.000Z

    In developing solar collectors, wind loading is the major structural design consideration. Wind loading investigations have focused on establishing safe bounds for steady state loading and verifying rational but initial and conservative design approaches for the various solar collector concepts. As such, the effort has been very successful, and has contributed greatly to both the recognition and qualitative understanding of many of the physical phenomena involved. Loading coefficients corresponding to mean wind velocities have been derived in these prior studies to measure the expected structural loading on the various solar collectors. Current design and testing procedures for wind loading are discussed. The test results corresponding to numerous wind tests on heliostats, parabolic troughs, parabolic dishes, and field mounted photovoltaic arrays are discussed and the applicability of the findings across the various technologies is assessed. One of the most significant consistencies in the data from all the technologies is the apparent benefit provided by fences and field shielding. Taken in toto, these data show that load reductions of three or possibly more seem feasible, though a more thorough understanding of the phenomena involved must be attained before this benefit can be realized. It is recommended that the required understanding be developed to take advantage of this benefit and that field tests be conducted to correlate with both analyses and tests.

  6. Dynamic modeling and control strategies for a micro-CSP plant with thermal storage powered by the Organic Rankine cycle

    E-Print Network [OSTI]

    Ireland, Melissa Kara

    2014-01-01T23:59:59.000Z

    Organic Rankine cycle (ORC) systems are gaining ground as a means of effectively providing sustainable energy. Coupling small-scale ORCs powered by scroll expander- generators with solar thermal collectors and storage can ...

  7. Sandia National Laboratories: Concentrating Solar Power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Concentrating Solar Power National Solar Thermal Testing Facility Beam Profiling On November 2, 2012, in Concentrating Solar Power, News, Renewable Energy, Solar On Thursday, June...

  8. Sandia National Laboratories: multiscale concentrated solar power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    concentrated solar power Solar Energy Research Institute for India and the United States Kick-Off On November 27, 2012, in Concentrating Solar Power, Energy, National Solar Thermal...

  9. Sandia National Laboratories: Concentrating Solar Power Systems

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Concentrating Solar Power Systems Air Force Research Laboratory Testing On November 2, 2012, in Concentrating Solar Power, Facilities, National Solar Thermal Test Facility, News,...

  10. What kind of a business is this? Reminiscences of the book trade and book collectors

    E-Print Network [OSTI]

    Zeitlin, Jacob

    1959-01-01T23:59:59.000Z

    of the Book Trade and Book Collectors by Jacob Zeitlin 1959 paper, 50c The Bibliographical Way by Fredson Bowers 1959 paper, 50c What kind of a business is this? Reminiscences of the Book Trade and Book Collectors JACOB ZEITLIN THE UNIVERSITY... Lecture Jacob Zeitlin. What Kind of a Business is This? Remi niscences of the Book Trade and Book Collectors. De livered at the University of Kansas, January 17, 1958. Sixth Lecture Fredson Bowers. The Bibliographical Way. Delivered at the University...

  11. Equivalencing the Collector System of a Large Wind Power Plant: Preprint

    SciTech Connect (OSTI)

    Muljadi, E.; Butterfield, C. P.; Ellis, A.; Mechenbier, J.; Hochheimer, J.; Young, R.; Miller, N.; Delmerico, R.; Zavadil, R.; Smith, J. C.

    2006-01-01T23:59:59.000Z

    This paper focuses on our effort to develop an equivalent representation of a wind power plant collector system for power system planning studies.

  12. Plasma lighting, fiber optics, and daylight collectors: Toward the next revolution in high-efficiency illumination

    SciTech Connect (OSTI)

    Audin, L. [Columbia Univ., New York, NY (United States)

    1995-06-01T23:59:59.000Z

    Combining three recently marketed innovations may provide the next revolution in illumination, making many other recent advances eventually obsolete. The first is plasma lighting, pioneered by Fusion Lighting Inc. of Rockville, Maryland, and first commercially applied by Hutchins International Ltd. of Mississauga, Ontario. This microwave-generated light source yields very high-quality light with efficacies at or beyond high intensity discharge (HID) lamps. The source uses no mercury, thus eliminating lamp disposal problems, and has no cathode, thereby providing very long lamp life. Using no phosphors, it also has very short start and re-strike periods, and is dimmable. The second innovation is in the distribution of light. Commercial developments in fiber optics and light guides now provide products that transfer light from a remote point and distribute it like standard light fixtures. Advances in fiber optic communications and applications to decorative lighting have supplied relatively economical systems for mounting and directing light from both electric light sources and the sun. The third advance is a result of efforts to harness daylight. Unlike architectural daylighting that directs sunlight into perimeter areas through glazing, daylight collectors are roof-mounted devices that supply light to interior and underground spaces through hollow columns and open chases. Aided by improvements and cost reductions in sun-tracking (i.e., heliostatic) controls that capture and concentrate sunlight, such collectors offer a source of free light to locations that might otherwise never receive it. When combined together, these three options could offer a centralized building lighting system that pipes lumens to distribution devices replacing many existing lamps and fixtures.

  13. A better steam engine: Designing a distributed concentrating

    E-Print Network [OSTI]

    Kammen, Daniel M.

    collector costs dominate. 2 #12;Distributed generation optionsg p · Biomass - methane, alcohol, dung, syngas added globally in 2008 · Geothermal heat pump · Fossil fuels - diesel, natural gas, propane, li application study: Reducing water consumption of concentrating solar power electricity generation, Tech. rep

  14. COMPARISON OF PROPORTIONAL AND ON/OFF SOLAR COLLECTOR LOOP CONTROL STRATEGIES USING A DYNAMIC COLLECTOR MODEL

    E-Print Network [OSTI]

    Schiller, Steven R.

    2013-01-01T23:59:59.000Z

    J.A. and Beckman, W.A. Solar Energy Thermal Processes. (NY:Heilbein, s. "Solar Applications of Thermal Energy Storage."

  15. WILLA Z. SILVERMAN. The New Bibliopolis: French Book Collectors and the Culture of Print, 1880-1914. Toronto: University of Toronto Press, 2008.

    E-Print Network [OSTI]

    Everton, Elizabeth

    2008-01-01T23:59:59.000Z

    New Bibliopolis: French Book Collectors and the Culture ofNew Bibliopolis: French Book Collectors and the Culture ofUzanne and the other book collectors haunting the pages of

  16. Advances in Concentrating Solar Power Collectors: Mirrors and Solar Selective Coatings

    SciTech Connect (OSTI)

    Kenendy, C. E.

    2007-10-10T23:59:59.000Z

    The intention is to explore the feasibility of depositing the coating by lower-cost methods and to perform a rigorous cost analysis after a viable high-temperature solar-selective coating is demonstrated by e-beam.

  17. Solar Radiation Data Manual for Flat-Plate and Concentrating Collectors

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItem Not FoundInformation DOEInformation Summary Big* - ' E 1 1"

  18. Integral collector storage system with heat exchange apparatus

    DOE Patents [OSTI]

    Rhodes, Richard O.

    2004-04-20T23:59:59.000Z

    The present invention relates to an integral solar energy collector storage systems. Generally, an integral collector storage system includes a tank system, a plurality of heat exchange tubes with at least some of the heat exchange tubes arranged within the tank system, a first glazing layer positioned over the tank system and a base plate positioned under the tank system. In one aspect of the invention, the tank system, the first glazing layer an the base plate each include protrusions and a clip is provided to hold the layers together. In another aspect of the invention, the first glazing layer and the base plate are ribbed to provide structural support. This arrangement is particularly useful when these components are formed from plastic. In yet another aspect of the invention, the tank system has a plurality of interconnected tank chambers formed from tubes. In this aspect, a supply header pipe and a fluid return header pipe are provided at a first end of the tank system. The heat exchange tubes have inlets coupled to the supply header pipe and outlets coupled to the return header pipe. With this arrangement, the heat exchange tubes may be inserted into the tank chambers from the first end of the tank system.

  19. Slope Error Measurement Tool for Solar Parabolic Trough Collectors: Preprint

    SciTech Connect (OSTI)

    Stynes, J. K.; Ihas, B.

    2012-04-01T23:59:59.000Z

    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.

  20. Transient multidimensional second law analysis of solar collectors subjected to time-varying insolation with diffuse components

    SciTech Connect (OSTI)

    Onyegegbu, S.O. (Univ. of Nigeria, Nsukka (Nigeria)); Morhenne, J. (Ruhr-Universitaet, Bochum (Germany))

    1993-01-01T23:59:59.000Z

    This paper presents an unsteady two-dimensional analysis of a flat-plate solar collector subjected to time varying insolation with considerable diffuse components as a better characterization of practical solar collectors. The analysis considers the thermal masses of the absorber, tube, glazing, and the working fluid in the system, as well as the different optical and thermodynamic properties of beam and diffuse radiation. Using two sets of insolation data, one for a near clear day and the other for an overcast day, an exergetic optimization of the system was carried out and flow rates which maximize the total energy output (extracted and accumulated) were determined for flow update periods of once very 30 min, 1 h, and the entire daylight period. The instantaneous optimum flow rates were found to follow the insolation pattern. On a daily basis, the optimum exergetic efficiencies and optimum flow rates were almost independent of the choice of the interval of fluid update, but were about 30% and 10%, respectively, higher for the clear day than for the overcast day.

  1. Energy-based Control of a Distributed Solar Collector Tor A. Johansena

    E-Print Network [OSTI]

    Johansen, Tor Arne

    Energy-based Control of a Distributed Solar Collector Field Tor A. Johansena Camilla Storaaa that the primary energy source, solar radiation, cannot be manipulated. The distributed solar collector eld may, Norway. Model-based control of the outlet temperature of a distributed solar col- lector eld is studied

  2. Department of Engineering Science and Mechanics Spring 2012 Solar Collector Research & Development Phase II

    E-Print Network [OSTI]

    Demirel, Melik C.

    PENNSTATE Department of Engineering Science and Mechanics Spring 2012 Solar Collector Research, low-maintenance solar collector that can output competitive efficiencies with respect to current solar & Development Phase II Overview Solar Dynamic is a small organization with the hopes of producing an affordable

  3. Heat Transfer in Buildings: Application to Solar Air Collector and Trombe Wall Design

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    11 Heat Transfer in Buildings: Application to Solar Air Collector and Trombe Wall Design H. Boyer applications are finally discussed. One concerns the modeling of a flat plate air collector and the second focuses on the modeling of Trombe solar walls. In each case, detailed modeling of heat transfer allows

  4. Interactions and Implications of a Collector Well with a River in an Unconfined Aquifer with Regional Background Flow

    E-Print Network [OSTI]

    Dugat, William D., IV

    2010-01-14T23:59:59.000Z

    the petroleum industry and hydrologic sciences. This study improved the understanding of the interaction of collector wells and the aquifers/reservoirs they tap by numerically modeling flux exchanges between a collector well and a river in an unconfined aquifer...

  5. Interactions and Implications of a Collector Well with a River in an Unconfined Aquifer with Regional Background Flow 

    E-Print Network [OSTI]

    Dugat, William D., IV

    2010-01-14T23:59:59.000Z

    the petroleum industry and hydrologic sciences. This study improved the understanding of the interaction of collector wells and the aquifers/reservoirs they tap by numerically modeling flux exchanges between a collector well and a river in an unconfined aquifer...

  6. Review of state-of-the-art of solar collector corrosion processes. Task 1 of solar collector studies for solar heating and cooling applications. Final technical progress report

    SciTech Connect (OSTI)

    Clifford, J E; Diegle, R B

    1980-04-11T23:59:59.000Z

    The state-of-the-art of solar collector corrosion processes is reviewed, and Task 1 of a current research program on use of aqueous heat transfer fluids for solar heating and cooling is summarized. The review of available published literature has indicated that lack of quantitative information exists relative to collector corrosion at the present time, particularly for the higher temperature applications of solar heating and cooling compared to domestic water heating. Solar collector systems are reviewed from the corrosion/service life viewpoint, with emphasis on various applications, collector design, heat transfer fluids, and freeze protection methods. Available information (mostly qualitative) on collector corrosion technology is reviewed to indicate potential corrosion problem areas and corrosion prevention practices. Sources of limited quantitative data that are reviewed are current solar applications, research programs on collector corrosion, and pertinent experience in related applications of automotive cooling and non-solar heating and cooling. A data bank was developed to catalog corrosion information. Appendix A of this report is a bibliography of the data bank, with abstracts reproduced from presently available literature accessions (about 220). This report is presented as a descriptive summary of information that is contained in the data bank.

  7. Method Of Making Solar Collectors By In-Situ Encapsulation Of Solar Cells

    DOE Patents [OSTI]

    Carrie, Peter J. (Toronto, CA); Chen, Kingsley D. D. (Markham, CA)

    2000-10-24T23:59:59.000Z

    A method of making solar collectors by encapsulating photovoltaic cells within a base of an elongated solar collector wherein heat and pressure are applied to the cells in-situ, after an encapsulating material has been applied. A tool is fashioned having a bladder expandable under gas pressure, filling a region of the collector where the cells are mounted. At the same time, negative pressure is applied outside of the bladder, enhancing its expansion. The bladder presses against a platen which contacts the encapsulated cells, causing outgassing of the encapsulant, while heat cures the encapsulant. After curing, the bladder is deflated and the tool may be removed from the collector and base and reflective panels put into place, if not already there, thereby allowing the solar collector to be ready for use.

  8. Attaching solar collectors to a structural framework utilizing a flexible clip

    DOE Patents [OSTI]

    Kruse, John S

    2014-03-25T23:59:59.000Z

    Methods and apparatuses described herein provide for the attachment of solar collectors to a structural framework in a solar array assembly. A flexible clip is attached to either end of each solar collector and utilized to attach the solar collector to the structural framework. The solar collectors are positioned to allow a member of the framework to engage a pair of flexible clips attached to adjacent solar collectors during assembly of the solar array. Each flexible clip may have multiple frame-engaging portions, each with a flange on one end to cause the flexible clip to deflect inward when engaged by the framework member during assembly and to guide each of the frame-engaging portions into contact with a surface of the framework member for attachment.

  9. QUASI-STAtIC CONCENTRATED ARRAY WITH DOU8LE SIDE ILLUMINATED SOLAR CELLS I A. luque, J.M. Ruiz, A. Cuevas, J. Eguren, J. Sangrador,

    E-Print Network [OSTI]

    del Alamo, Jesús A.

    demonstrated. 1. INTRODUCTION R. Winston(l) and his collaborators have de " veloDed" cylindrical concentrator on a trough-like collector of arbitrary sec tion, provided that the projection of the in cident rays

  10. Analysis of Rotating Collectors from the Private Region of JET with Carbon Wall and Metallic ITER-Like Wall

    E-Print Network [OSTI]

    Analysis of Rotating Collectors from the Private Region of JET with Carbon Wall and Metallic ITER-Like Wall

  11. Advanced Manufacture of Second-Surface, Silvered Glass Reflectors for High-Performance, Low-Cost CSP Collector Systems

    Broader source: Energy.gov [DOE]

    Advanced Manufacture of Second-Surface, Silvered Glass Reflectors for High-Performance, Low-Cost CSP Collector Systems

  12. Standard practice for evaluating absorptive solar receiver materials when exposed to conditions simulating stagnation in solar collectors with cover plates

    E-Print Network [OSTI]

    American Society for Testing and Materials. Philadelphia

    1986-01-01T23:59:59.000Z

    Standard practice for evaluating absorptive solar receiver materials when exposed to conditions simulating stagnation in solar collectors with cover plates

  13. Proc. 20th Symp. Principles of Programming Languages, 1993, pages 113--123. A concurrent, generational garbage collector

    E-Print Network [OSTI]

    Leroy, Xavier

    , generational garbage collector for a multithreaded implementation of ML Damien Doligez Xavier Leroy ' Ecole and implementation of a ``quasi real­time'' garbage collector for Concurrent Caml Light, an implementation of ML with threads. This two­generation system combines a fast, asynchronous copying collector on the young

  14. DT RESULTS OF TFTR'S ALPHA COLLECTOR H. W. HERRMANN, S. J. ZWEBEN, D. S. DARROW, J. R. TIMBERLAKE

    E-Print Network [OSTI]

    DT RESULTS OF TFTR'S ALPHA COLLECTOR H. W. HERRMANN, S. J. ZWEBEN, D. S. DARROW, J. R. TIMBERLAKE Physics Hamilton, Ontario, Canada ABSTRACT. An escaping alpha collector probe has been developed for TFTR the range of alphas implanted into nickel foils located within the alpha collector. Exposedsamples have been

  15. Zhang et al Effect of a collector bag for measurement of postpartum blood loss after vaginal1

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Zhang et al 1 Effect of a collector bag for measurement of postpartum blood loss after vaginal1: severe post-partum haemorrhage, collector bag, cluster-randomised controlled1 trial, Europe2 collector bag for measurement of postpartum blood loss after vaginal delivery in reducing the6 incidence

  16. Formal Derivation of Concurrent Garbage Collectors Dusko Pavlovic1, Peter Pepper2, and Douglas R. Smith1

    E-Print Network [OSTI]

    Pavlovic, Dusko

    Formal Derivation of Concurrent Garbage Collectors Dusko Pavlovic1, Peter Pepper2, and Douglas R¨at Berlin and Fraunhofer FIRST, Berlin pepper@cs.tu-berlin.de Abstract. Concurrent garbage collectors are notoriously difficult to implement correctly. Previous approaches to the issue of producing correct collectors

  17. Discrete Mathematics and Theoretical Computer Science DMTCS vol. (subm.), by the authors, 11 The weighted words collector

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ­1 The weighted words collector J´er´emie du Boisberranger1 and Dani`ele Gardy1 and Yann Ponty2 1 Universit´e de collector problem, i.e. the expected number of calls to a random weighted generator before all the words collector lies in the, potentially large, multiplicity of the words/coupons of a given probability

  18. Large-Signal HBT Model with Improved Collector Transit Time Formulation for GaAs and InP Technologies

    E-Print Network [OSTI]

    Asbeck, Peter M.

    mi': iaE Large-Signal HBT Model with Improved Collector Transit Time Formulation for GaAs and In large-signal HBT model which accurately accounts for the intricate hias dependence of collector delay collector delay function accounts for the variation of electron velocity with electric field

  19. Proc. 20th Symp. Principles of Programming Languages, 1993, pages 113{123. A concurrent, generational garbage collector

    E-Print Network [OSTI]

    Leroy, Xavier

    , generational garbage collector for a multithreaded implementation of ML Damien Doligez Xavier Leroy Ecole a \\quasireal-time"garbage collector for Concurrent Caml Light, an implementation of ML with threads. This two-generation system combines a fast, asynchronous copying collector on the young generation with a non- disruptive

  20. Offset voltage of Schottky-collector silicon-on-glass vertical PNP's G. Lorito, L. K. Nanver and N. Nenadovi

    E-Print Network [OSTI]

    Technische Universiteit Delft

    Offset voltage of Schottky-collector silicon-on-glass vertical PNP's G. Lorito, L. K. Nanver and N and investigated with respect to the influence of the collector design on the offset voltage. With Schottky collector contacts the offset voltage can be made both very low (

  1. 1070 IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 49, NO. 6, JUNE 2002 A New Lateral PNM Schottky Collector Bipolar Transistor

    E-Print Network [OSTI]

    Kumar, M. Jagadesh

    Collector Bipolar Transistor (SCBT) on SOI for Nonsaturating VLSI Logic Design M. Jagadesh Kumar and D. The collector-base junction of the proposed lateral PNM transistor consists of a Schottky junction between n PNM, numerical simulation, Schottky collector, silicon-on-insulator (SOI). I. INTRODUCTION Because

  2. A Generational On-the-y Garbage Collector for Java Tamar Domani Elliot K. Kolodner y Erez Petrank z

    E-Print Network [OSTI]

    Petrank, Erez

    A Generational On-the- y Garbage Collector for Java Tamar Domani #3; Elliot K. Kolodner y Erez Petrank z Abstract An on-the- y garbage collector does not stop the program threads to perform the collection. Instead, the collector executes in a separate thread (or pro- cess) in parallel to the program

  3. A Generational On-the-y Garbage Collector for Java Tamar Domani Elliot K. Kolodner y Erez Petrank z

    E-Print Network [OSTI]

    Petrank, Erez

    A Generational On-the- y Garbage Collector for Java Tamar Domani #3; Elliot K. Kolodner y Erez Petrank z Abstract An on-the- y garbage collector does not stop the program threads to perform the collection. Instead, the collector executes in a separate thread (or process) in parallel to the program. On

  4. IDENTIFYING OFF-NORMAL HYPERVELOCITY IMPACTS IN ALUMINUM FOIL BY AUGER IMAGING: IMPLICATIONS FOR THE EXAMINATION OF THE INTERSTELLAR COLLECTOR.

    E-Print Network [OSTI]

    FOR THE EXAMINATION OF THE INTERSTELLAR COLLECTOR. F. J. Stadermann1 , C. Floss1 , H. Y. M. Lam1 , M. C. Price2 , M. J was to comet 81P/Wild 2, it also carried a second collector which was designed to capture and return contemporary interstellar dust traversing the solar system [1]. The design of this interstellar collector

  5. IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 32, NO. 3, JUNE 2004 1267 Improvements in Depressed Collector Performance

    E-Print Network [OSTI]

    Valfells, Ágúst

    Collector Performance by Modifications to Electrode Geometry Vis-a-Vis Trajectories of Backscattered, Life Fellow, IEEE Abstract--Backscattering of electrons in depressed collectors has a significant effect on the collector efficiency and other performance parameters. We have studied these phenomena

  6. The Effect of Debris on Collector Optics, its Mitigation and Repair: Next-Step a Gaseous Sn EUV DPP Source

    E-Print Network [OSTI]

    Spila, Timothy P.

    The Effect of Debris on Collector Optics, its Mitigation and Repair: Next-Step a Gaseous Sn EUV DPP to advanced fuel plasma EUV sources is collector lifetime. The Illinois Debris-mitigation EUV Applications based on this work. Keywords: EUV source, debris, optics, collector lifetime, mitigation, plasma

  7. Temperature-dependent mechanical property testing of nitrate thermal storage salts.

    SciTech Connect (OSTI)

    Everett, Randy L.; Iverson, Brian D.; Broome, Scott Thomas; Siegel, Nathan Phillip; Bronowski, David R.

    2010-09-01T23:59:59.000Z

    Three salt compositions for potential use in trough-based solar collectors were tested to determine their mechanical properties as a function of temperature. The mechanical properties determined were unconfined compressive strength, Young's modulus, Poisson's ratio, and indirect tensile strength. Seventeen uniaxial compression and indirect tension tests were completed. It was found that as test temperature increases, unconfined compressive strength and Young's modulus decreased for all salt types. Empirical relationships were developed quantifying the aforementioned behaviors. Poisson's ratio tends to increase with increasing temperature except for one salt type where there is no obvious trend. The variability in measured indirect tensile strength is large, but not atypical for this index test. The average tensile strength for all salt types tested is substantially higher than the upper range of tensile strengths for naturally occurring rock salts. Interest in raising the operating temperature of concentrating solar technologies and the incorporation of thermal storage has motivated studies on the implementation of molten salt as the system working fluid. Recently, salt has been considered for use in trough-based solar collectors and has been shown to offer a reduction in levelized cost of energy as well as increasing availability (Kearney et al., 2003). Concerns regarding the use of molten salt are often related to issues with salt solidification and recovery from freeze events. Differences among salts used for convective heat transfer and storage are typically designated by a comparison of thermal properties. However, the potential for a freeze event necessitates an understanding of salt mechanical properties in order to characterize and mitigate possible detrimental effects. This includes stress imparted by the expanding salt. Samples of solar salt, HITEC salt (Coastal Chemical Co.), and a low melting point quaternary salt were cast for characterization tests to determine unconfined compressive strength, indirect tensile strength, coefficient of thermal expansion (CTE), Young's modulus, and Poisson's ratio. Experiments were conducted at multiple temperatures below the melting point to determine temperature dependence.

  8. Concentrated Thermoelectric Power

    Broader source: Energy.gov [DOE]

    This fact sheet describes a concentrated solar hydroelectric power project awarded under the DOE's 2012 SunShot Concentrating Solar Power R&D award program. The team, led by MIT, is working to demonstrate concentrating solar thermoelectric generators with >10% solar-to-electrical energy conversion efficiency while limiting optical concentration to less than a factor of 10 and potentially less than 4. When combined with thermal storage, CSTEGs have the potential to provide electricity day and night using no moving parts at both the utility and distributed scale.

  9. Development of an Advanced, Low-Cost parabolic Trough Collector...

    Broader source: Energy.gov (indexed) [DOE]

    width 6m 8m Maximum operating temperature 400C 500C Heat transfer fluid Thermal Oil Thermal Oil or Molten Salt ReflecTech(tm) Mirror Film ReflecTech(tm)PLUS - Abrasion...

  10. Progress of the stochastic cooling system of the Collector Ring

    E-Print Network [OSTI]

    Dimopoulou, C; Bohm, R; Dolinskyy, O; Franzke, B; Hettrich, R; Maier, W; Menges, R; Nolden, F; Peschke, C; Petri, P; Steck, M; Thorndahl, L

    2013-01-01T23:59:59.000Z

    An overview of the recent achievements and ongoing developments for the stochastic cooling system of the Collector Ring is given. In focus are the hardware developments as well as the progress in predicting the system performance. The system operates in the frequency band 1-2 GHz, it has to provide fast 3D cooling of antiproton, rare isotope and stable heavy ion beams. The main challenges are (i) the cooling of antiprotons by means of cryogenic movable pick-up electrodes and (ii) the fast two-stage cooling (pre-cooling by the Palmer method, followed by the notch filter method) of the hot rare isotope beams (RIBs). Recently, a novel code for simulating the cooling process in the time domain has been developed at CERN. First results for the momentum cooling for heavy ions in the CR will be shown in comparison with results obtained in the frequency domain with the Fokker-Planck approach.

  11. Rim-drive cable-aligned heliostat collector system

    DOE Patents [OSTI]

    Dolan, J.E.; Sands, T.D.

    1982-09-30T23:59:59.000Z

    Disclosed is a heliostat collector apparatus comprising at least one heliostat suspended from a plurality of longitudinally extending linkage means. An enclosure structure is disposed adjacent the heliostat and provides a means for allowing the heliostat to be substantially protected from weathering. A first drive means is operatively connected to the heliostat to effect steering thereof in at least one of first and second predetermined directions. Finally, a frame member is adapted for supporting the heliostat at an inner portion thereof. The frame includes a plurality of outer expandable portions. Each one of the expandable portions is adapted to slidably engage a corresponding one of the plurality of linkage means. The expandable portions are further adapted to allow the heliostat to be slidably moved along the linkage means in directions away from and towards the enclosure structure and to substantially reduce stress acting on the heliostat during steering.

  12. Oil/gas collector/separator for underwater oil leaks

    DOE Patents [OSTI]

    Henning, Carl D. (Livermore, CA)

    1993-01-01T23:59:59.000Z

    An oil/gas collector/separator for recovery of oil leaking, for example, from an offshore or underwater oil well. The separator is floated over the point of the leak and tethered in place so as to receive oil/gas floating, or forced under pressure, toward the water surface from either a broken or leaking oil well casing, line, or sunken ship. The separator is provided with a downwardly extending skirt to contain the oil/gas which floats or is forced upward into a dome wherein the gas is separated from the oil/water, with the gas being flared (burned) at the top of the dome, and the oil is separated from water and pumped to a point of use. Since the density of oil is less than that of water it can be easily separated from any water entering the dome.

  13. Lightweight performance data collectors 2.0 with Eiger support.

    SciTech Connect (OSTI)

    Allan, Benjamin A.

    2013-05-01T23:59:59.000Z

    We report on the use and design of a portable, extensible performance data collection tool motivated by modeling needs of the high performance computing systems co-design com- munity. The lightweight performance data collectors with Eiger support is intended to be a tailorable tool, not a shrink-wrapped library product, as pro ling needs vary widely. A single code markup scheme is reported which, based on compilation ags, can send perfor- mance data from parallel applications to CSV les, to an Eiger mysql database, or (in a non-database environment) to at les for later merging and loading on a host with mysql available. The tool supports C, C++, and Fortran applications.

  14. Rim-drive cable-aligned heliostat collector system

    DOE Patents [OSTI]

    Dolan, James E. (Denver, CO); Sands, Timothy D. (Berkeley, CA)

    1984-01-01T23:59:59.000Z

    Disclosed is a heliostat collector apparatus comprising at least one heliostat suspended from a plurality of longitudinally extending linkage means. An enclosure structure is disposed adjacent the heliostat and provides a means for allowing the heliostat to be substantially protected from weathering. A first drive means is operatively connected to the heliostat to effect steering thereof in at least one of first and second predetermined directions. Finally, a frame member is adapted for supporting the heliostat at an inner portion thereof. The frame includes a plurality of outer expandable portions. Each one of the expandable portions is adapted to slidably engage a corresponding one of the plurality of linkage means. The expandable portions are further adapted to allow the heliostat to be slidably moved along the linkage means in directions away from and towards the enclosure structure and to substantially reduce stress acting on the heliostat during steering.

  15. System for thermal energy storage, space heating and cooling and power conversion

    DOE Patents [OSTI]

    Gruen, Dieter M. (Downers Grove, IL); Fields, Paul R. (Chicago, IL)

    1981-04-21T23:59:59.000Z

    An integrated system for storing thermal energy, for space heating and cong and for power conversion is described which utilizes the reversible thermal decomposition characteristics of two hydrides having different decomposition pressures at the same temperature for energy storage and space conditioning and the expansion of high-pressure hydrogen for power conversion. The system consists of a plurality of reaction vessels, at least one containing each of the different hydrides, three loops of circulating heat transfer fluid which can be selectively coupled to the vessels for supplying the heat of decomposition from any appropriate source of thermal energy from the outside ambient environment or from the spaces to be cooled and for removing the heat of reaction to the outside ambient environment or to the spaces to be heated, and a hydrogen loop for directing the flow of hydrogen gas between the vessels. When used for power conversion, at least two vessels contain the same hydride and the hydrogen loop contains an expansion engine. The system is particularly suitable for the utilization of thermal energy supplied by solar collectors and concentrators, but may be used with any source of heat, including a source of low-grade heat.

  16. COMPARISON OF PROPORTIONAL AND ON/OFF SOLAR COLLECTOR LOOP CONTROL STRATEGIES USING A DYNAMIC COLLECTOR MODEL

    E-Print Network [OSTI]

    Schiller, Steven R.

    2013-01-01T23:59:59.000Z

    of Solar Energy, Vol. II, Thermal Processes (University ofSolar Group Energy and Environment Division Lawrence Berkeley Laboratory University

  17. PV/thermal solar power assembly

    DOE Patents [OSTI]

    Ansley, Jeffrey H.; Botkin, Jonathan D.; Dinwoodie, Thomas L.

    2004-01-13T23:59:59.000Z

    A flexible solar power assembly (2) includes a flexible photovoltaic device (16) attached to a flexible thermal solar collector (4). The solar power assembly can be rolled up for transport and then unrolled for installation on a surface, such as the roof (20, 25) or side wall of a building or other structure, by use of adhesive and/or other types of fasteners (23).

  18. Method of making a current collector for a sodium/sulfur battery

    DOE Patents [OSTI]

    Tischer, R.P.; Winterbottom, W.L.; Wroblowa, H.S.

    1987-03-10T23:59:59.000Z

    This specification is directed to a method of making a current collector for a sodium/sulfur battery. The current collector so-made is electronically conductive and resistant to corrosive attack by sulfur/polysulfide melts. The method includes the step of forming the current collector for the sodium/sulfur battery from a composite material formed of aluminum filled with electronically conductive fibers selected from the group of fibers consisting essentially of graphite fibers having a diameter up to 10 microns and silicon carbide fibers having a diameter in a range of 500--1,000 angstroms. 2 figs.

  19. Method of making a current collector for a sodium/sulfur battery

    DOE Patents [OSTI]

    Tischer, Ragnar P. (Birmingham, MI); Winterbottom, Walter L. (Farmington Hills, MI); Wroblowa, Halina S. (West Bloomfield, MI)

    1987-01-01T23:59:59.000Z

    This specification is directed to a method of making a current collector (14) for a sodium/sulfur battery (10). The current collector so-made is electronically conductive and resistant to corrosive attack by sulfur/polysulfide melts. The method includes the step of forming the current collector for the sodium/sulfur battery from a composite material (16) formed of aluminum filled with electronically conductive fibers selected from the group of fibers consisting essentially of graphite fibers having a diameter up to 10 microns and silicon carbide fibers having a diameter in a range of 500-1000 angstroms.

  20. Electrolytic/fuel cell bundles and systems including a current collector in communication with an electrode thereof

    DOE Patents [OSTI]

    Hawkes, Grant L.; Herring, James S.; Stoots, Carl M.; O'Brien, James E.

    2013-03-05T23:59:59.000Z

    Electrolytic/fuel cell bundles and systems including such bundles include an electrically conductive current collector in communication with an anode or a cathode of each of a plurality of cells. A cross-sectional area of the current collector may vary in a direction generally parallel to a general direction of current flow through the current collector. The current collector may include a porous monolithic structure. At least one cell of the plurality of cells may include a current collector that surrounds an outer electrode of the cell and has at least six substantially planar exterior surfaces. The planar surfaces may extend along a length of the cell, and may abut against a substantially planar surface of a current collector of an adjacent cell. Methods for generating electricity and for performing electrolysis include flowing current through a conductive current collector having a varying cross-sectional area.

  1. 530 IEEE ELECTRON DEVICE LETTERS, VOL. 26, NO. 8, AUGUST 2005 InGaAs/InP DHBTs With 120-nm Collector Having

    E-Print Network [OSTI]

    Rodwell, Mark J. W.

    Collector Having Simultaneously High f , fmax 450 GHz Zach Griffith, Mark J. W. Rodwell, Fellow, IEEE, Xiao. The devices have been scaled vertically for reduced electron collector transit time and aggres- sively scaled laterally to minimize the base­collector capacitance associated with thinner collectors. The dc current gain

  2. InP DHBT IC Technology with Implanted Collector-Pedestal and Electroplated Device Contacts M. Urteaga, K. Shinohara, R. Pierson, P. Rowell and B. Brar

    E-Print Network [OSTI]

    Rodwell, Mark J. W.

    InP DHBT IC Technology with Implanted Collector-Pedestal and Electroplated Device Contacts M that incorporates an ion implanted N+ collector-pedestal for reduction of extrinsic collector-base capacitance Ccb without a collector pedestal. Static frequency-divider circuits have been realized in the technology

  3. The effects of storage time, storage temperature, and concentration on percent recoveries of thermally desorbed diffusive dosimeter samples contaminated with chloroform 

    E-Print Network [OSTI]

    Gallucci, Joseph Matthew

    1981-01-01T23:59:59.000Z

    is similar to the charcoal tube method, i. e. , it employs activated charcoal as the collection med1um and is frequently stored prior to analysis. Further research 1s required to evaluate the desorption effic1ency for various organ1c compounds collected... carefully. Future research should concentrate on determining an optimally effic1ent technique in analyzing d1ffusive dosimeters. Other parameters that requ1re further study are the effect of d1fferent desorption rates on var1ous organic chemicals...

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

    E-Print Network [OSTI]

    Carrillo, Juan Felipe (Carrillo Salazar)

    2013-01-01T23:59:59.000Z

    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 ...

  5. Site name: Khorgo Lava Pine, Mongolia Collectors: A. Hessl, N. Pederson, Kevin Anchukaitis, John Burkhart,

    E-Print Network [OSTI]

    Pederson, Neil

    Site name: Khorgo Lava Pine, Mongolia Collectors: A. Hessl, N. Pederson Empire, and modern Mongolia. Proceedings of the National Academy of Science collected in 2010 and 2012 across the Khorgo lava field near Tariat, Mongolia

  6. Physics and Astronomy Geophysics Concentration

    E-Print Network [OSTI]

    Thaxton, Christopher S.

    Physics and Astronomy Geophysics Concentration Strongly recommended courses Credits Term Dept. to Geophysics 3 PHY 3230 Thermal Physics 3 CHE 1101 Introductory Chemistry - I 3 CHE 1110 Introductory Chemistry

  7. Concentrated solar power on demand

    E-Print Network [OSTI]

    Codd, Daniel Shawn

    2011-01-01T23:59:59.000Z

    This thesis describes a new concentrating solar power central receiver system with integral thermal storage. Hillside mounted heliostats direct sunlight into a volumetric absorption molten salt pool, which also functions ...

  8. Solar thermal aircraft

    DOE Patents [OSTI]

    Bennett, Charles L. (Livermore, CA)

    2007-09-18T23:59:59.000Z

    A solar thermal powered aircraft powered by heat energy from the sun. A heat engine, such as a Stirling engine, is carried by the aircraft body for producing power for a propulsion mechanism, such as a propeller. The heat engine has a thermal battery in thermal contact with it so that heat is supplied from the thermal battery. A solar concentrator, such as reflective parabolic trough, is movably connected to an optically transparent section of the aircraft body for receiving and concentrating solar energy from within the aircraft. Concentrated solar energy is collected by a heat collection and transport conduit, and heat transported to the thermal battery. A solar tracker includes a heliostat for determining optimal alignment with the sun, and a drive motor actuating the solar concentrator into optimal alignment with the sun based on a determination by the heliostat.

  9. Thermally stabilized heliostat

    DOE Patents [OSTI]

    Anderson, Alfred J. (Littleton, CO)

    1983-01-01T23:59:59.000Z

    An improvement in a heliostat having a main support structure and pivoting and tilting motors and gears and a mirror module for reflecting solar energy onto a collector, the improvement being characterized by an internal support structure within each mirror module and front and back sheets attached to the internal support structure, the front and back sheets having the same coefficient of thermal expansion such that no curvature is induced by temperature change, and a layer of adhesive adhering the mirror to the front sheet. The adhesive is water repellent and has adequate set strength to support the mirror but has sufficient shear tolerance to permit the differential expansion of the mirror and the front sheet without inducing stresses or currature effect. The adhesive also serves to dampen fluttering of the mirror and to protect the mirror backside against the adverse effects of weather. Also disclosed are specific details of the preferred embodiment.

  10. Corrosion of lithium-ion battery current collectors

    SciTech Connect (OSTI)

    Braithwaite, J.W.; Gonzales, A.; Nagasubramanian, G.; Lucero, S.J.; Peebles, D.E.; Ohlhausen, J.A.; Cieslak, W.R. [Sandia National Labs., Albuquerque, NM (United States)] [Sandia National Labs., Albuquerque, NM (United States)

    1999-02-01T23:59:59.000Z

    The primary current-collector materials being used in lithium-ion cells are susceptible to environmental degradation: aluminum to pitting corrosion and copper to environmentally assisted cracking. Localized corrosion occurred on bare aluminum electrodes during simulated ambient-temperature cycling in an excess of electrolyte. The highly oxidizing potential associated with the positive-electrode charge condition was the primary factor. The corrosion mechanism differed from the pitting typically observed in aqueous electrolytes because each site was filled with a mixed metal/metal-oxide product, forming surface mounds or nodules. Electrochemical impedance spectroscopy was shown to be an effective analytical tool for characterizing the corrosion behavior of aluminum under these conditions. Based on X-ray photoelectron spectroscopy analyses, little difference existed in the composition of the surface film on aluminum and copper after immersion or cycling in LiPF{sub 6} electrolytes made with two different solvent formulations. Although Li and P were the predominant adsorbed surface species, the corrosion resistance of aluminum may simply be due to its native oxide. Finally, copper was shown to be susceptible to environmental cracking at or near the lithium potential when specific metallurgical conditions existed (work hardening and large grain size).

  11. Line-focus solar thermal energy technology development. FY 79 annual report for Department 4720

    SciTech Connect (OSTI)

    Bergeron, K D; Champion, R L; Hunke, R W [eds.

    1980-04-01T23:59:59.000Z

    The primary role of the Solar Energy Projects Department II (4720) is the development, evaluation, and testing of line-focus solar thermal technology. This report of FY 79 progress and accomplishments is divided into two parts: (1) Component and Subsystem Development including the design and analysis of collector modules, their components, and associated materials and processes, and (2) Systems and Applications Development, involving larger configurations of solar thermal line-focus systems. The emphasis is on parabolic troughs, but significant efforts on hemispherical bowls, compound parabolic collectors, and dishes for the Solar Total Energy Project are also described.

  12. Receiver for solar energy collector having improved aperture aspect

    DOE Patents [OSTI]

    McIntire, William R. (Downers Grove, IL)

    1984-01-01T23:59:59.000Z

    A secondary concentrator for use in receiver systems for linear focusing primary concentrators is provided with reflector wings at each end. The wings increase the capture of light rays reflected from areas adjacent the rim of a primary concentrator, increasing the apparent aperture size of the absorber as viewed from the rim of the primary concentrator. The length, tilt, and curvature of the wing reflectors can be adjusted to provide an absorber having a desired aperture aspect.

  13. Solar thermal collector system modeling and testing for novel solar cooker

    E-Print Network [OSTI]

    Foley, Brian, S.B. (Brian M.). Massachusetts Institute of Technology

    2014-01-01T23:59:59.000Z

    Solar cookers are aimed at reducing pollution and desertification in the developing world. However, they are often disregarded as they do not give users the ability to cook after daylight hours. The Wilson solar cooker is ...

  14. Collector/Receiver Characterization (Fact Sheet), Thermal Systems Group: CSP Capabilities (TSG)

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041clothAdvanced Materials Advanced. C o w l i tCollaboration March 16, 2010ofLaboratory (LANL)

  15. Low-cost, Modular, Building-integrated Photovoltaic-Thermal Collector -

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9November 6, 2014 PNGC,Low-Temperature

  16. Sandia National Laboratories: Concentrating Solar Power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Sandia-AREVA Commission Solar ThermalMolten Salt Energy-Storage Demonstration On May 21, 2014, in Capabilities, Concentrating Solar Power, Energy, Energy Storage, Facilities,...

  17. Sandia National Laboratories: Concentrating Solar Power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    SolarReserve Is Testing Prototype Heliostats at NSTTF On March 3, 2015, in Concentrating Solar Power, Energy, Facilities, National Solar Thermal Test Facility, News, News &...

  18. Sandia National Laboratories: Concentrating Solar Power: Efficiently...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Funding Award On June 4, 2014, in Advanced Materials Laboratory, Concentrating Solar Power, Energy, Energy Storage, Facilities, National Solar Thermal Test Facility,...

  19. Sandia National Laboratories: Concentrating Solar Power

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Gas Sectors in the United States View all EC Publications Related Topics Concentrating Solar Power CRF CSP EFRC Energy Energy Efficiency Energy Security National Solar Thermal...

  20. Modeling Thermal Fatigue in CPV Cell Assemblies (Presentation)

    SciTech Connect (OSTI)

    Bosco, N.; Panchagade, D.; Kurtz, S.

    2011-02-01T23:59:59.000Z

    This presentation outlines the modeling of thermal fatigue in concentrating photovoltaic (CPV) assemblies.

  1. Modeling of concentrating solar thermoelectric generators

    E-Print Network [OSTI]

    Ren, Zhifeng

    The conversion of solar power into electricity is dominated by non-concentrating photovoltaics and concentrating solar thermal systems. Recently, it has been shown that solar thermoelectric generators (STEGs) are a viable ...

  2. Proceedings of ICRC 2001: 860 c Copernicus Gesellschaft 2001 Event reconstruction for the orbiting wide-angle light collectors

    E-Print Network [OSTI]

    for the orbiting wide-angle light collectors (OWL) air-fluorescence detector T. Z. Abu-Zayyad1 and the OWL

  3. Design of photovoltaic central power station concentrator array

    SciTech Connect (OSTI)

    Not Available

    1984-02-01T23:59:59.000Z

    A design for a photovoltaic central power station using tracking concentrators has been developed. The 100 MW plant is assumed to be located adjacent to the Saguaro Power Station of Arizona Public Service. The design assumes an advanced Martin Marietta two-axis tracking fresnel lens concentrator. The concentrators are arrayed in 5 MW subfields, each with its own power conditioning unit. The photovoltaic plant output is connected to the existing 115 kV switchyard. The site specific design allows detailed cost estimates for engineering, site preparation, and installation. Collector and power conditioning costs have been treated parametrically.

  4. Prototype Development for Self-Cleaning CSP Collectors

    Broader source: Energy.gov [DOE]

    This presentation was delivered at the SunShot Concentrating Solar Power (CSP) Program Review 2013, held April 23–25, 2013 near Phoenix, Arizona.

  5. Fluidic Solar Collectors New Materials and Mechanisms for Heliostats

    Broader source: Energy.gov [DOE]

    This presentation was delivered at the SunShot Concentrating Solar Power (CSP) Program Review 2013, held April 23–25, 2013 near Phoenix, Arizona.

  6. Impact of component selection and operation on thermal ratings of drain-back solar water heaters

    SciTech Connect (OSTI)

    Davidson, J.H.; Carlson, W.T.; Duff, W.S. (Colorado State Univ., Fort Collins, CO (United States). Solar Energy Applications Lab.)

    1992-11-01T23:59:59.000Z

    In this paper a half-factorial, two-level experimental design is used to determine the effects of changes in collector area, storage tank volume, collector flow rate, recirculation flow rate, and storage tank design on thermal rating of a solar drain-back water heating system. Experimental ratings are determined in accordance with the Solar Rating and Certification Corporation guidelines. Storage tank design is varied by using a stratification manifold in place of the standard drop tube. Variations in other component sizes and operating factors are based on current industry standards. Statistical analyses indicate that a change in collector area accounts for nearly 90 percent of the variation in heat output. Doubling collector area from 2.78 m[sup 2] to 5.56 m[sup 2] increases delivered solar energy by 31 percent. Use of a stratification manifold increases the delivery of solar energy by six percent. Doubling collector flow rate from 0.057 to 0.114 1/s increases solar output by aproximately three percent; however, the increase in pumping energy outweighs the benefits of increasing collector flow rate. The effects of recirculation flow rate and tank volume are obscured by experimental error.

  7. Standard test method for isotopic analysis of uranium hexafluoride by double standard single-collector gas mass spectrometer method

    E-Print Network [OSTI]

    American Society for Testing and Materials. Philadelphia

    2010-01-01T23:59:59.000Z

    1.1 This is a quantitative test method applicable to determining the mass percent of uranium isotopes in uranium hexafluoride (UF6) samples with 235U concentrations between 0.1 and 5.0 mass %. 1.2 This test method may be applicable for the entire range of 235U concentrations for which adequate standards are available. 1.3 This test method is for analysis by a gas magnetic sector mass spectrometer with a single collector using interpolation to determine the isotopic concentration of an unknown sample between two characterized UF6 standards. 1.4 This test method is to replace the existing test method currently published in Test Methods C761 and is used in the nuclear fuel cycle for UF6 isotopic analyses. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro...

  8. Wind loads on heliostats and parabolic dish collectors: Final subcontractor report

    SciTech Connect (OSTI)

    Peterka, J.A.; Tan, Z.; Bienkiewicz, B.; Cermak, J.E.

    1988-11-01T23:59:59.000Z

    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.

  9. Multi-Collector Inductively Coupled Plasma Mass Spectrometer – Operational Performance Report

    SciTech Connect (OSTI)

    Matthew Watrous; Anthony Appelhans; Robert Hague; John Olson; Tracy Houghton

    2013-06-01T23:59:59.000Z

    The INL made an assessment of the commercially available inductively coupled plasma mass spectrometers (ICPMS) for actinide analysis; emphasizing low detection limits for plutonium. INL scientists subsequently determined if plutonium was present on a swipe, at a 10 million atom decision level. This report describes the evaluation of ICPMS instruments and the operational testing of a new process for the dissolution, separation and analysis via ICPMS of swipes for plutonium and uranium. The swipe dissolution, plutonium and uranium isolation, separation and purification are wet chemistry methods following established procedures. The ICPMS is a commercially available multi-collector magnetic sector mass spectrometer that utilizes five ion counting detectors operating simultaneously. The instrument includes a sample introduction system allowing for sample volumes of < 1 mL to be reproducibly injected into the instrument with minimal waste of the sample solution, while maximizing the useable signal. The performance of the instrument was measured using SRM 996 (244Pu spike) at concentrations of 12 parts per quadrillion (ppq, fg/mL) and with SRM 4350B Columbia River Sediment samples spiked onto swipes at the 10 million atom level. The measured limit of detection (LOD, defined as 3s) for 239Pu is 310,000 atoms based upon the instrument blank data. The limit of quantification (LOQ defined as 10 s) for 239Pu is 105,000 atoms. The measured limit of detection for 239Pu from the SRM 4350B spiked onto a swipe was 2.7 million atoms with the limit of quantification being 9.0 million atoms.

  10. MERCURY CONTROL WITH THE ADVANCED HYBRID PARTICULATE COLLECTOR

    SciTech Connect (OSTI)

    Stanley J. Miller; Ye Zhuang; Michelle R. Olderbak

    2002-11-01T23:59:59.000Z

    This project was awarded under U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) Program Solicitation DE-PS26-00NT40769 and specifically addresses Technical Topical Area 4-Testing Novel and Less Mature Control Technologies on Actual Flue Gas at the Pilot Scale. The project team includes the Energy & Environmental Research Center (EERC) as the main contractor; W.L. Gore & Associates, Inc., as a technical and financial partner; and the Big Stone Power Plant operated by Otter Tail Power Company, host for the field-testing portion of the research. Since 1995, DOE has supported development of a new concept in particulate control called the advanced hybrid particulate collector (AHPC). The AHPC has been licensed to W.L. Gore & Associates, Inc., and is now marketed as the ADVANCED HYBRID{trademark} Filter by Gore. The AHPC combines the best features of electrostatic precipitators (ESPs) and baghouses in a unique configuration, providing major synergism between the two collection methods, both in the particulate collection step and in the transfer of dust to the hopper. The AHPC provides ultrahigh collection efficiency, overcoming the problem of excessive fine-particle emissions with conventional ESPs, and it solves the problem of reentrainment and re-collection of dust in conventional baghouses. The AHPC appears to have unique advantages for mercury control over baghouses or ESPs as an excellent gas-solid contactor. The objective of the three-task project is to demonstrate 90% total mercury control in the AHPC at a lower cost than current mercury control estimates. The approach includes bench-scale batch testing that ties the new work to previous results and links results with larger-scale pilot testing with real flue gas on a coal-fired combustion system, pilot-scale testing on a coal-fired combustion system with both a pulse-jet baghouse and an AHPC to prove or disprove the research hypotheses, and field demonstration pilot-scale testing at a utility power plant to prove scaleup and demonstrate longer-term mercury control. This project, if successful, will demonstrate at the pilot-scale level a technology that would provide a cost-effective technique to accomplish control of mercury emissions and, at the same time, greatly enhance fine particulate collection efficiency. The technology can be used to retrofit systems currently employing inefficient ESP technology as well as for new construction, thereby providing a solution to a large segment of the U.S. utility industry as well as other industries requiring mercury control.

  11. THERMAL ENERGY STORAGE IN AQUIFERS WORKSHOP

    E-Print Network [OSTI]

    Authors, Various

    2011-01-01T23:59:59.000Z

    Energy produced by the solar collectors A. t::.T/2. )- (lAwith heat pumps and solar collectors Vertical cylinderA trickle type of solar collector heats the water in the

  12. THERMAL PERFORMANCE OF INSULATING WINDOW SYSTEMS

    E-Print Network [OSTI]

    Selkowitz, Stephen E.

    2011-01-01T23:59:59.000Z

    Flat Plate Solar Collectors", Solar~. 11· 151-158, (1975).atten- tion in solar collector and passive solar heatingCoeff·icients in Solar Collectors", Bulletin .Q_f the

  13. Random Deployment of Data Collectors for Serving Randomly-Located Sensors

    E-Print Network [OSTI]

    Kwon, Taesoo

    2011-01-01T23:59:59.000Z

    Recently, wireless communication industries have begun to extend their services to machine-type communication devices as well as to the user equipment. Such machine-type communication devices as meters and sensors need intermittent uplink resources to report measured or sensed data to their serving data collector. It is however hard to dedicate limited uplink resources to each of them. Thus, efficient service of a tremendous number of devices with low activities may consider simple random access as a solution. The data collectors receiving the measured data from many sensors simultaneously can successfully decode only signals with signal-to-interference-plus-noise-ratio (SINR) above a certain value. The main design issues for this environment become how many data collectors are needed, how much power sensor nodes transmit with, and how wireless channels affect the performance. This paper provides answers to those questions through a stochastic analysis based on a spatial point process and on simulations.

  14. Increasing the Efficiency of a Thermionic Engine Using a Negative Electron Affinity Collector

    E-Print Network [OSTI]

    Joshua Ryan Smith

    2013-07-18T23:59:59.000Z

    Most attention to improving vacuum thermionic energy conversion device (TEC) technology has been on improving electron emission with little attention to collector optimization. A model was developed to characterize the output characteristics of a TEC where the collector features negative electron affinity (NEA). According to the model, there are certain conditions for which the space charge limitation can be reduced or eliminated. The model is applied to devices comprised of materials reported in the literature, and predictions of output power and efficiency are made, targeting the sub-1000K hot-side regime. By slightly lowering the collector barrier height, an output power of around $1kW$, at $\\geq 20%$ efficiency for a reasonably sized device ($\\sim 0.1m^{2}$ emission area) can be achieved.

  15. Optimization of the Collection Efficiency of a Hexagonal Light Collector using Quadratic and Cubic Bézier Curves

    E-Print Network [OSTI]

    Akira Okumura

    2012-06-04T23:59:59.000Z

    Reflective light collectors with hexagonal entrance and exit apertures are frequently used in front of the focal-plane camera of a very-high-energy gamma-ray telescope to increase the collection efficiency of atmospheric Cherenkov photons and reduce the night-sky background entering at large incident angles. The shape of a hexagonal light collector is usually based on Winston's design, which is optimized for only two-dimensional optical systems. However, it is not known whether a hexagonal Winston cone is optimal for the real three-dimensional optical systems of gamma-ray telescopes. For the first time we optimize the shape of a hexagonal light collector using quadratic and cubic B\\'ezier curves. We demonstrate that our optimized designs simultaneously achieve a higher collection efficiency and background reduction rate than traditional designs.

  16. Automated solar collector installation design including ability to define heterogeneous design preferences

    DOE Patents [OSTI]

    Wayne, Gary; Frumkin, Alexander; Zaydman, Michael; Lehman, Scott; Brenner, Jules

    2013-01-08T23:59:59.000Z

    Embodiments may include systems and methods to create and edit a representation of a worksite, to create various data objects, to classify such objects as various types of pre-defined "features" with attendant properties and layout constraints. As part of or in addition to classification, an embodiment may include systems and methods to create, associate, and edit intrinsic and extrinsic properties to these objects. A design engine may apply of design rules to the features described above to generate one or more solar collectors installation design alternatives, including generation of on-screen and/or paper representations of the physical layout or arrangement of the one or more design alternatives. Embodiments may also include definition of one or more design apertures, each of which may correspond to boundaries in which solar collector layouts should comply with distinct sets of user-defined design preferences. Distinct apertures may provide heterogeneous regions of collector layout according to the user-defined design preferences.

  17. Automated solar collector installation design including ability to define heterogeneous design preferences

    DOE Patents [OSTI]

    Wayne, Gary; Frumkin, Alexander; Zaydman, Michael; Lehman, Scott; Brenner, Jules

    2014-04-29T23:59:59.000Z

    Embodiments may include systems and methods to create and edit a representation of a worksite, to create various data objects, to classify such objects as various types of pre -defined "features" with attendant properties and layout constraints. As part of or in addition to classification, an embodiment may include systems and methods to create, associate, and edit intrinsic and extrinsic properties to these objects. A design engine may apply of design rules to the features described above to generate one or more solar collectors installation design alternatives, including generation of on-screen and/or paper representations of the physical layout or arrangement of the one or more design alternatives. Embodiments may also include definition of one or more design apertures, each of which may correspond to boundaries in which solar collector layouts should comply with distinct sets of user-defined design preferences. Distinct apertures may provide heterogeneous regions of collector layout according to the user-defined design preferences.

  18. Solar Collector: A Novel Way of Harnessing the Sun's Energy The team analysed the prototype and different design alternatives.The goal of the Solar Collector is to better

    E-Print Network [OSTI]

    Demirel, Melik C.

    Solar Collector: A Novel Way of Harnessing the Sun's Energy Overview The team analysed the prototype and different design alternatives.The goal of the Solar Collector is to better harness the solar energy by focusing the sun's energy through a series of curved reflective fins. A challenge the team

  19. Investigations of Graphite Current Collectors and Metallic Lithium...

    Broader source: Energy.gov (indexed) [DOE]

    Charge 1mm LQI foam C30 C30 C30 C30 C2 C2 C2 C2 Cell: Li anode (Ni) LiPF 6 (EC+EMC) or (EC+DMC) Celgard LIFePO 4 -C, Al wire * Good cycling, so thermal bonds of LiFePO 4...

  20. The Sector Collector of the CMS DT Trigger system: Installation and Performance

    E-Print Network [OSTI]

    Travaglini, R

    2008-01-01T23:59:59.000Z

    Drift Tubes chambers are used for muon detection in the central region of the CMS experiment at LHC. Custom electronics is used for reconstructing muon track segments and for triggering the CMS readout. The trigger Sector Collector modules collect muon segments identified by the on-chamber devices, synchronize the data received from different chambers and convert from LVDS to Optical for transmission to the off-detector electronics. Installation and integration tests were developed for tuning both firmware and hardware of the Sector Collector system: results are reviewed. The system performance during CMS data taking with cosmic rays is discussed.

  1. A Patterned 3D Silicon Anode Fabricated by Electrodeposition on a Virus-Structured Current Collector

    SciTech Connect (OSTI)

    Chen, X L; Gerasopoulos, K; Guo, J C; Brown, A; Wang, Chunsheng; Ghodssi, Reza; Culver, J N

    2011-01-01T23:59:59.000Z

    Electrochemical methods were developed for the deposition of nanosilicon onto a 3D virus-structured nickel current collector. This nickel current collector is composed of self-assembled nanowire-like rods of genetically modified tobacco mosaic virus (TMV1cys), chemically coated in nickel to create a complex high surface area conductive substrate. The electrochemically depo­sited 3D silicon anodes demonstrate outstanding rate performance, cycling stability, and rate capability. Electrodeposition thus provides a unique means of fabricating silicon anode materials on complex substrates at low cost.

  2. Proposal and design of a new SiC-emitter lateral NPM Schottky collector bipolar transistor on

    E-Print Network [OSTI]

    Kumar, M. Jagadesh

    Proposal and design of a new SiC-emitter lateral NPM Schottky collector bipolar transistor on SOI, a SiC emitter lateral NPM Schottky collector bipolar transistor (SCBT) with a silicon-on-insulator (SOI on simulation results, the authors demonstrate for the first time that the proposed SiC emitter lateral NPM

  3. Determination of the optimum inclination of a flat solar collector in function of latitude and local climatic data

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    569 Determination of the optimum inclination of a flat solar collector in function of latitude of a solar collector, it is necessary to reduce its size to a minimum for a given collected energy of equations described in this work were developed to determine the inclination angle of a . flat solar

  4. Distributed Energy Resources for Carbon Emissions Mitigation

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2008-01-01T23:59:59.000Z

    tax increases, larger solar collector/absorption chillerphotovoltaics, solar thermal collectors, and energy storagecapacity of solar thermal collectors carbon emissions

  5. All-glass vacuum tube collector heat transfer model used in forced-circulation solar water heating system

    SciTech Connect (OSTI)

    Li, Zhiyong; Chen, Chao; Luo, Hailiang; Zhang, Ye; Xue, Yaning [College of Architecture and Civil Engineering, Beijing University of Technology, Beijing (China)

    2010-08-15T23:59:59.000Z

    The aim of this paper is to establish the heat transfer model of all-glass vacuum tube collector used in forced-circulation solar water heating system. In this model, the simplified heat transfer of collector is composed of the natural convection in single glass tube and forced flow in manifold header. Thus the heat balance equation of water in single tube and the heat balance equation of water in manifold header have been established. The flow equation is also built by analyzing the friction and buoyancy in tube. Through solved these equations the relationship between the collector average temperature, the outlet temperature and natural convection flow rate have been obtained. From this relationship and energy balance equation of collector, the collector outlet temperature can be calculated. The validated experiments of this model were carried out in winter of Beijing. (author)

  6. 60nm collector InGaAs/InP Type-I DHBTs demonstrating 660 GHz f , BVCEO = 2.5V, and BVCBO = 2.7V

    E-Print Network [OSTI]

    Rodwell, Mark J. W.

    60nm collector InGaAs/InP Type-I DHBTs demonstrating 660 GHz f , BVCEO = 2.5V, and BVCBO = 2.7VGaAs base and a 60 nm InP collector containing an InGaAs/InAlAs superlattice grade. Devices employing a 400. The devices have been scaled vertically for reduced base and collector electron transit times, and the base-collector

  7. Phenylnaphthalene as a Heat Transfer Fluid for Concentrating Solar Power: High-Temperature Static Experiments

    SciTech Connect (OSTI)

    Bell, Jason R [ORNL; Joseph III, Robert Anthony [ORNL; McFarlane, Joanna [ORNL; Qualls, A L [ORNL

    2012-05-01T23:59:59.000Z

    Concentrating solar power (CSP) may be an alternative to generating electricity from fossil fuels; however, greater thermodynamic efficiency is needed to improve the economics of CSP operation. One way of achieving improved efficiency is to operate the CSP loop at higher temperatures than the current maximum of about 400 C. ORNL has been investigating a synthetic polyaromatic oil for use in a trough type CSP collector, to temperatures up to 500 C. The oil was chosen because of its thermal stability and calculated low vapor and critical pressures. The oil has been synthesized using a Suzuki coupling mechanism and has been tested in static heating experiments. Analysis has been conducted on the oil after heating and suggests that there may be some isomerization taking place at 450 C, but the fluid appears to remain stable above that temperature. Tests were conducted over one week and further tests are planned to investigate stabilities after heating for months and in flow configurations. Thermochemical data and thermophysical predictions indicate that substituted polyaromatic hydrocarbons may be useful for applications that run at higher temperatures than possible with commercial fluids such as Therminol-VP1.

  8. IEEE TRANSACTIONS ON ELECTRON DEVICES, VOL. 53, NO. 9, SEPTEMBER 2006 2407 SiGe HBT Without Selectively Implanted Collector (SIC)

    E-Print Network [OSTI]

    Rieh, Jae-Sung

    Selectively Implanted Collector (SIC) Exhibiting fmax = 310 GHz and BVCEO = 2 V Jae-Sung Rieh, Marwan Khater peak fmax of 310 GHz at the collector-current density of 7 mA/µm2 and BVCEO of 2 V, are reported behind the speed enhancement has been the continuous vertical scaling of the device structure. Collector

  9. s.n., sine numero) and made several collections from a similar local-ity (common 1800's to early 1900's). Also, a few collectors use the

    E-Print Network [OSTI]

    Krings, Alexander

    1900's). Also, a few collectors use the same collection number (e.g., Ruth 400) for different vouchers.g., T33S, R28E, S18 - township 33 south, range 28 east, section 18) cited by modern collectors are included. Locality abbreviations used by collectors (e.g., Ind. Terr. - indian territory) were cited

  10. Appears in 1993 ACM Symposium on Principles and Practice of Parallel Programming, pp. 73{82. 1 A Concurrent Copying Garbage Collector

    E-Print Network [OSTI]

    Huelsbergen, Lorenz

    A Concurrent Copying Garbage Collector for Languages that Distinguish (Im)mutable Data Lorenz Huelsbergen- tion of a concurrent compacting garbage collector for languages that distinguish mutable data from functionallanguagessuch as Haskell). Thecollector runs on shared-memory parallel computers and re- quires minimal mutator/collector

  11. An OntheFly Mark and Sweep Garbage Collector Based on Sliding Views Hezi Azatchi + Yossi Levanoni # Harel Paz Erez Petrank

    E-Print Network [OSTI]

    Petrank, Erez

    An On­the­Fly Mark and Sweep Garbage Collector Based on Sliding Views #3; Hezi Azatchi + Yossi garbage collector has become acute. We propose a novel mark and sweep on­the­fly algorithm based on the sliding views mechanism of Levanoni and Petrank. We have implemented our collector on the Jikes Java

  12. Effects of regional insolation differences upon advanced solar thermal electric power plant performance and energy costs

    SciTech Connect (OSTI)

    Latta, A.F.; Bowyer, J.M.; Fujita, T.; Richter, P.H.

    1980-02-01T23:59:59.000Z

    This study determines the performance and cost of four 10 MWe advanced solar thermal electric power plants sited in various regions of the continental United States. The solar plants are conceptualized to begin commercial operation in the year 2000. It is assumed that major subsystem performance will have improved substantially as compared to that of pilot plants currently operating or under construction. The net average annual system efficiency is therefore roughly twice that of current solar thermal electric power plant designs. Similarly, capital costs reflecting goals based on high-volume mass production that are considered to be appropriate for the year 2000 have been used. These costs, which are approximately an order of magnitude below the costs of current experimental projects, are believed to be achievable as a result of the anticipated sizeable solar penetration into the energy market in the 1990 to 2000 timeframe. The paraboloidal dish, central receiver, cylindrical parabolic trough, and compound parabolic concentrators comprise the advanced collector concepts studied. All concepts exhibit their best performance when sited in regional areas such as the sunbelt where the annual insolation is high. The regional variation in solar plant performance has been assessed in relation to the expected rise in the future cost of residential and commercial electricity in the same regions. A discussion of the regional insolation data base, a description of the solar systems performance and costs, and a presentation of a range for the forecast cost of conventional electricity by region and nationally over the next several decades are given.

  13. Planar fuel cell utilizing nail current collectors for increased active surface area

    DOE Patents [OSTI]

    George, Thomas J. (Star City, WV); Meacham, G. B. Kirby (Shaker Heights, OH)

    2002-03-26T23:59:59.000Z

    A plurality of nail current collector members are useful in the gas flow passages of an electrochemical device to optimize the active surfaces of the device and to provide structural support. In addition, the thicknesses of cathode and anode layers within the electrochemical device are varied according to current flow through the device to reduce resistance and increase operating efficiency.

  14. A SOLAR STILL AUGMENTED WITH A FLAT-PLATE COLLECTOR AND A REFLECTOR

    E-Print Network [OSTI]

    A SOLAR STILL AUGMENTED WITH A FLAT-PLATE COLLECTOR AND A REFLECTOR A. Saleh A. Badran Mechanical ­ Jordan Amman ­ Jordan e-mail: asaleh@philadelphia.edu.jo e-mail: badran@ju.edu.jo ABSTRACT A solar distillation system was built and tested to study the effect of increasing the solar radiation incident

  15. Examination of the corrosion behavior of aluminum current collectors in lithium/polymer batteries

    SciTech Connect (OSTI)

    Chen, Y.; Devine, T.M.; Evans, J.W. [Lawrence Berkeley National Lab., CA (United States). Environmental Energy Technology Div.] [Lawrence Berkeley National Lab., CA (United States). Environmental Energy Technology Div.; [Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering; Monteiro, O.R.; Brown, I.G. [Lawrence Berkeley National Lab., CA (United States). Accelerator and Fusion Research Div.] [Lawrence Berkeley National Lab., CA (United States). Accelerator and Fusion Research Div.

    1999-04-01T23:59:59.000Z

    The corrosion behavior of aluminum, a candidate material for the current collectors of the positive electrodes of lithium-polymer batteries, in contact with a lithium polymer electrolyte was examined in both batteries and three-electrode electrochemical cells. The results indicate aluminum is resistant to uniform corrosion in the polymer electrolyte: poly(ethylene oxide)-LiN(CF{sub 3}SO{sub 2}){sub 2} but can be susceptible to pitting corrosion. Localized pitting corrosion occurs on the aluminum current collector during overcharging of the battery. Pitting corrosion only occurred in the electrochemical cells when the aluminum electrode was anodically polarized to potentials that were considerably greater than those that resulted in pitting corrosion in batteries. The greater susceptibility of the aluminum current collectors of batteries to pitting corrosion is attributed to inhomogeneous current flow through the current collector. This results in local breakdown of the passive film on aluminum at sites of locally high current density. The inhomogeneous current density that flows through the aluminum/cathode interface is caused by the presence of discrete paths through the cathode with low electrical resistance. In an effort to improve the localized corrosion behavior of aluminum electrodes, it was found that surfaces impregnated by ion implantation with {approximately}20 atom % tungsten exhibited enhanced resistance to pitting corrosion in poly(ethylene oxide)-LiN(CF{sub 3}SO{sub 2}){sub 2}.

  16. Collector surface for a microwave tube comprising a carbon-bonded carbon-fiber composite

    DOE Patents [OSTI]

    Lauf, Robert J. (Oak Ridge, TN); McMillan, April D. (Knoxville, TN); Johnson, Arvid C. (Lake in the Hills, IL); Moorhead, Arthur J. (Knoxville, TN)

    1998-01-01T23:59:59.000Z

    In a microwave tube, an improved collector surface coating comprises a porous carbon composite material, preferably a carbon-bonded carbon fiber composite having a bulk density less than about 2 g/cc. Installation of the coating is readily adaptable as part of the tube manufacturing process.

  17. Performance of the CHAPS Collectors Coventry Destination Renewables-ANZSES 2003 copyright

    E-Print Network [OSTI]

    for Sustainable Energy Systems Australian National University Canberra 0200 A.C.T. AUSTRALIA E the centre and outside edges of the solar cells. INTRODUCTION The Centre for Sustainable Energy Systems (CSES-mail:joe.coventry@anu.edu.au Abstract The performance of the Combined Heat and Power Solar (CHAPS) collectors at the Australian National

  18. Collector surface for a microwave tube comprising a carbon-bonded carbon-fiber composite

    DOE Patents [OSTI]

    Lauf, R.J.; McMillan, A.D.; Johnson, A.C.; Moorhead, A.J.

    1998-07-28T23:59:59.000Z

    In a microwave tube, an improved collector surface coating comprises a porous carbon composite material, preferably a carbon-bonded carbon fiber composite having a bulk density less than about 2 g/cc. Installation of the coating is readily adaptable as part of the tube manufacturing process. 4 figs.

  19. Electron emission in a source-collector sheath system: A kinetic study

    SciTech Connect (OSTI)

    Rizopoulou, N., E-mail: nikoleta.rizopoulou06@imperial.ac.uk; Coppins, M.; Bacharis, M. [Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BW (United Kingdom); Robinson, A. P. L. [Central Laser Facility, Rutherford-Appleton Laboratory, Chilton, Oxon OX11 0QX (United Kingdom)

    2014-10-15T23:59:59.000Z

    The classical source-collector sheath system describes a plasma that forms between a Maxwellian source and an absorbing wall. The plasma is assumed to be collisionless and without ionization. Two distinct areas are being formed: the collector sheath, an ion-rich region in contact with the absorbing boundary, and the source sheath, which is an electron-rich area near the Maxwellian source. In this work, we study a modified version of the classical source-collector sheath system, where the wall is no longer absorbing but emits electrons. As a result, we have two different types of collector sheath, one where a potential well is formed and one without a potential well. We examine the effect of electron emission for a range of conditions for the plasma and the emitted electrons. In the first part of this work, we study the problem analytically, and in the second, using our kinetic Vlasov code, Yggdrasil. The simulation results are in very good agreement with the predictions of our theoretical model.

  20. Hematite-based Photo-oxidation of Water Using Transparent Distributed Current Collectors

    E-Print Network [OSTI]

    Hematite-based Photo-oxidation of Water Using Transparent Distributed Current Collectors Shannon C. Martinson*,, Argonne-Northwestern Solar Energy Research (ANSER) Center and § Department of Chemistry collection of photocurrent from ultrathin coatings of hematite layers, enabling the formation of photoanodes