Sample records for active solar systems

  1. Performance monitoring of active solar energy systems

    SciTech Connect (OSTI)

    Yarosh, M. (ed.)

    1983-06-01T23:59:59.000Z

    For purposes of the workship, performance of systems was defined to include not just the thermal performance of the system, but also the operational reliability of the system and its components over the expected system life. Specific papers were invited on the most significant programs of field monitoring currently underway. These papers and the experience of the participants formed the basis for extended discussions held during the workshop. Performance monitoring of active solar systems has been conducted both in the field and under more controlled conditions in the laboratory. Extensive discussion was undertaken on the merits of testing systems in the field and testing systems in the laboratory. There was general agreement that both types of testing are needed, but substantial disagreement on the value of a particular kind of test to meet a specific need. There was strong support for the premise that field monitoring is the only method that determines what is being delivered in the field. There were mixed views on the preferred method for model validation and on the trustworthiness of laboratory versus field data. Extensive discussion occurred on the value of different levels of sophistication of instrumentation. The quality of the data obtained, the cost of such data and the tradeoffs in cost, quality and reliability for differing instrumentation and data acquisition systems were addressed. Among those most familiar with problems of system reliability was the feeling that the potential for system performance improvement lay more strongly in the development of greater reliability rather than through improvements in thermal performance.

  2. Experimental Research of an Active Solar Heating System 

    E-Print Network [OSTI]

    Gao, X.; Li, D.

    2006-01-01T23:59:59.000Z

    : Solar is an abundant renewable energy, which is used more and more frequently with the emphasis on environment protection, especially in building heating. The different devised methods between an active solar heating system and normal heating...

  3. PREDICTING THE TIME RESPONSE OF A BUILDING UNDER HEAT INPUT CONDITIONS FOR ACTIVE SOLAR HEATING SYSTEMS

    E-Print Network [OSTI]

    Warren, Mashuri L.

    2013-01-01T23:59:59.000Z

    Solar Energy Systems for Heating and Cooling. May, 1978. (Washington:Hemisphere heating, Publishing Corp. , 1978),INPUT CONDITIONS FOR ACTIVE SOLAR HEATING SYSTEMS Mashuri L.

  4. Engineering principles and concepts for active solar systems

    SciTech Connect (OSTI)

    Hunn, B.D.; Carlisle, N.; Franta, G.; Kolar, W. (eds.)

    1987-07-01T23:59:59.000Z

    This publication is a much refined and updated version of a solar design handbook originally prepared in 1978 to accompany a series of week-long courses conducted in support of the Solar Federal Buildings Program. The 1978 material was published in 1981 as the Solar Design Workbook (SERI/SP-62-308). This current document represents the culmination of an eight-year effort to compile a comprehensive state-of-the-art reference and instructional tool for practicing design professionals, architects, and engineers. It is intended to cover all phases of the design and installation of active solar energy systems for buildings. Although it contains many design guidelines, the emphasis is on providing sufficient knowledge of how these systems work to allow an engineer or architect to make well-informed decisions. It is aimed primarily at commercial building applications, but most of the material is also applicable to residential buildings.

  5. active solar systems: Topics by E-print Network

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

    63 Intelligent Solar Tracker System Implemented On CiteSeer Summary: Abstract Solar energy is becoming increasingly attractive as we grapple with global climate...

  6. Experimental Research of an Active Solar Heating System

    E-Print Network [OSTI]

    Gao, X.; Li, D.

    2006-01-01T23:59:59.000Z

    Re newable Energy Resources and a Greener Future Vol.VIII-1-5 REFERENCES: [1]. Rao KUANG, Yongyun Zhou, Shaoyu Shao. The relation between PV modules? gesture in BIPV and absorbed solar irradiation [J]. Acta Energiae Solaris Sinica, 2004, 25... ventilation and air conditioning, 2000, 30(4): 30-32. [4]. Hong Ye, Jun WANG, Shuangyong ZHUANG. Experimental Study on the Radiant Floor Heating System Utilizing Form-stable PCM As the Thermal Mass [J]. Acta Energiae Solaris Sinica, 2004, 25(5): 651...

  7. and solar activity

    E-Print Network [OSTI]

    Memorie Della; K. Georgieva; C. Bianchi; B. Kirov

    Abstract. Solar activity, together with human activity, is considered a possible factor for the global warming observed in the last century. However, in the last decades solar activity has remained more or less constant while surface air temperature has continued to increase, which is interpreted as an evidence that in this period human activity is the main factor for global warming. We show that the index commonly used for quantifying long-term changes in solar activity, the sunspot number, accounts for only one part of solar activity and using this index leads to the underestimation of the role of solar activity in the global warming in the recent decades. A more suitable index is the geomagnetic activity which reflects all solar activity, and it is highly correlated to global temperature variations in the whole period for which we have data. Key words. Solar activity, Global warming 1. Sunspot number and global temperature The most popular index of solar activity is the International sunspot number (R). A reconstruction

  8. Solar system fault detection

    DOE Patents [OSTI]

    Farrington, R.B.; Pruett, J.C. Jr.

    1984-05-14T23:59:59.000Z

    A fault detecting apparatus and method are provided for use with an active solar system. The apparatus provides an indication as to whether one or more predetermined faults have occurred in the solar system. The apparatus includes a plurality of sensors, each sensor being used in determining whether a predetermined condition is present. The outputs of the sensors are combined in a pre-established manner in accordance with the kind of predetermined faults to be detected. Indicators communicate with the outputs generated by combining the sensor outputs to give the user of the solar system and the apparatus an indication as to whether a predetermined fault has occurred. Upon detection and indication of any predetermined fault, the user can take appropriate corrective action so that the overall reliability and efficiency of the active solar system are increased.

  9. Solar load ratio method applied to commercial building active solar system sizing

    SciTech Connect (OSTI)

    Schnurr, N.M.; Hunn, B.D.; Williamson, K.D. III

    1981-01-01T23:59:59.000Z

    The hourly simulation procedure is the DOE-2 building energy analysis computer program. It is capable of calculating the loads and of simulating various control strategies in detail for both residential and commercial buildings and yet is computationally efficient enough to be used for extensive parametric studies. In addition, to a Building Service Hot Water (BSHW) System and a combined space heating and hot water system using liquid collectors for a commercial building analyzed previously, a space heating system using an air collector is analyzed. A series of runs is made for systems using evacuated tube collectors for comparison to flat-plate collectors, and the effects of additional system design parameters are investigated. Also, the generic collector types are characterized by standard efficiency curves, rather than by detailed collector specifications. (MHR)

  10. Solar powered desalination system

    E-Print Network [OSTI]

    Mateo, Tiffany Alisa

    2011-01-01T23:59:59.000Z

    USA, Jacksonville, FL Jacksonville Solar Energy Generation Facility Constructed Systems that produce electricity

  11. Solar powered desalination system

    E-Print Network [OSTI]

    Mateo, Tiffany Alisa

    2011-01-01T23:59:59.000Z

    direct solar radiation onto the PEC cell and tracking isTracking Concentration…………………….39 Figure 1.20: PV-RO System……………………………………………………………..42 Figure 1.21: Solar

  12. Deciphering Solar Magnetic Activity: On Grand Minima in Solar Activity

    E-Print Network [OSTI]

    McIntosh, Scott W

    2015-01-01T23:59:59.000Z

    The Sun provides the energy necessary to sustain our existence. While the Sun provides for us, it is also capable of taking away. The weather and climatic scales of solar evolution and the Sun-Earth connection are not well understood. There has been tremendous progress in the century since the discovery of solar magnetism - magnetism that ultimately drives the electromagnetic, particulate and eruptive forcing of our planetary system. There is contemporary evidence of a decrease in solar magnetism, perhaps even indicators of a significant downward trend, over recent decades. Are we entering a minimum in solar activity that is deeper and longer than a typical solar minimum, a "grand minimum"? How could we tell if we are? What is a grand minimum and how does the Sun recover? These are very pertinent questions for modern civilization. In this paper we present a hypothetical demonstration of entry and exit from grand minimum conditions based on a recent analysis of solar features over the past 20 years and their p...

  13. Solar powered desalination system

    E-Print Network [OSTI]

    Mateo, Tiffany Alisa

    2011-01-01T23:59:59.000Z

    of the electrical power output to the solar power input), aSolar Energy Calculator using Google Maps 23 Table 1.24: PV System Power Production Average Daily Irradiance (kWh/m2) Instillation Efficiency Labeled Efficiency Output

  14. Gap between active and passive solar heating

    SciTech Connect (OSTI)

    Balcomb, J.D.

    1985-01-01T23:59:59.000Z

    The gap between active and passive solar could hardly be wider. The reasons for this are discussed and advantages to narrowing the gap are analyzed. Ten years of experience in both active and passive systems are reviewed, including costs, frequent problems, performance prediction, performance modeling, monitoring, and cooling concerns. Trends are analyzed, both for solar space heating and for service water heating. A tendency for the active and passive technologies to be converging is observed. Several recommendations for narrowing the gap are presented.

  15. Annual DOE active solar heating and cooling contractors' review meeting. Premeeting proceedings and project summaries

    SciTech Connect (OSTI)

    None,

    1981-09-01T23:59:59.000Z

    Ninety-three project summaries are presented which discuss the following aspects of active solar heating and cooling: Rankine solar cooling systems; absorption solar cooling systems; desiccant solar cooling systems; solar heat pump systems; solar hot water systems; special projects (such as the National Solar Data Network, hybrid solar thermal/photovoltaic applications, and heat transfer and water migration in soils); administrative/management support; and solar collector, storage, controls, analysis, and materials technology. (LEW)

  16. Petrovay: Solar physics The solar cycle ACTIVE REGIONS

    E-Print Network [OSTI]

    Petrovay, Kristóf

    Petrovay: Solar physics The solar cycle ACTIVE REGIONS Large scale (up to 100 Mm) anomalies in the structure and radiation of the solar atmosphere. Photosphere : AR = cluster of strong magnetic flux tubes of facular points. Filamentary structure due to supergranulation. #12;Petrovay: Solar physics The solar cycle

  17. Solar Energy System Exemption

    Broader source: Energy.gov [DOE]

    A solar energy system is defined as "any device that uses the heat of the sun as its primary energy source and is used to heat or cool the interior of a structure or swimming pool, or to heat...

  18. Systems Integration: Solar Energy Technologies Program (SETP) (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2009-10-01T23:59:59.000Z

    Fact sheet summarizing the goals and activities of the DOE Solar Energy Technologies Program efforts within its systems integration subprogram.

  19. Solar powered desalination system

    E-Print Network [OSTI]

    Mateo, Tiffany Alisa

    2011-01-01T23:59:59.000Z

    2008, uses concentrated solar power to split water. Figurethe main reason the potential for solar power is boundless.a clean energy source, solar power is inexhaustible, fairly

  20. PREDICTING THE TIME RESPONSE OF A BUILDING UNDER HEAT INPUT CONDITIONS FOR ACTIVE SOLAR HEATING SYSTEMS

    E-Print Network [OSTI]

    Warren, Mashuri L.

    2013-01-01T23:59:59.000Z

    OF A BUILDING UNDER HEAT INPUT CONDITIONS FOR ACTIVE SOLAROF A BUILDING UNDER HEAT INPUT CONDITIONS FOR ACTIVE SOLARbuilding to changes in heat input, and to predict room and

  1. Solar powered desalination system

    E-Print Network [OSTI]

    Mateo, Tiffany Alisa

    2011-01-01T23:59:59.000Z

    are many solar photovoltaic power plants internationally andUSA, Blythe, CA Solar electric power plant, Blythe USA, SanTX Blue Wing solar electric power plant USA, Jacksonville,

  2. Solar heating system

    DOE Patents [OSTI]

    Schreyer, James M. (Oak Ridge, TN); Dorsey, George F. (Concord, TN)

    1982-01-01T23:59:59.000Z

    An improved solar heating system in which the incident radiation of the sun is absorbed on collector panels, transferred to a storage unit and then distributed as heat for a building and the like. The improvement is obtained by utilizing a storage unit comprising separate compartments containing an array of materials having different melting points ranging from 75.degree. to 180.degree. F. The materials in the storage system are melted in accordance with the amount of heat absorbed from the sun and then transferred to the storage system. An efficient low volume storage system is provided by utilizing the latent heat of fusion of the materials as they change states in storing and releasing heat for distribution.

  3. Improved solar heating systems

    DOE Patents [OSTI]

    Schreyer, J.M.; Dorsey, G.F.

    1980-05-16T23:59:59.000Z

    An improved solar heating system is described in which the incident radiation of the sun is absorbed on collector panels, transferred to a storage unit and then distributed as heat for a building and the like. The improvement is obtained by utilizing a storage unit comprising separate compartments containing an array of materials having different melting points ranging from 75 to 180/sup 0/F. The materials in the storage system are melted in accordance with the amount of heat absorbed from the sun and then transferred to the storage system. An efficient low volume storage system is provided by utilizing the latent heat of fusion of the materials as they change states in storing ad releasing heat for distribution.

  4. Solar thermal power system

    DOE Patents [OSTI]

    Bennett, Charles L.

    2010-06-15T23:59:59.000Z

    A solar thermal power generator includes an inclined elongated boiler tube positioned in the focus of a solar concentrator for generating steam from water. The boiler tube is connected at one end to receive water from a pressure vessel as well as connected at an opposite end to return steam back to the vessel in a fluidic circuit arrangement that stores energy in the form of heated water in the pressure vessel. An expander, condenser, and reservoir are also connected in series to respectively produce work using the steam passed either directly (above a water line in the vessel) or indirectly (below a water line in the vessel) through the pressure vessel, condense the expanded steam, and collect the condensed water. The reservoir also supplies the collected water back to the pressure vessel at the end of a diurnal cycle when the vessel is sufficiently depressurized, so that the system is reset to repeat the cycle the following day. The circuital arrangement of the boiler tube and the pressure vessel operates to dampen flow instabilities in the boiler tube, damp out the effects of solar transients, and provide thermal energy storage which enables time shifting of power generation to better align with the higher demand for energy during peak energy usage periods.

  5. Integrated Solar Thermochemical Reaction System

    Broader source: Energy.gov [DOE]

    This fact sheet describes an integrated solar thermochemical reaction system project awarded under the DOE's 2012 SunShot Concentrating Solar Power R&D award program. The team, led by the Pacific Northwest National Laboratory, is working to develop and demonstrate a high-performance solar thermochemical reaction system in an end-to-end demonstration that produces electricity. A highly efficient solar thermochemical reaction system would allow for 24-hour operation without the need for storage technology, and reductions in total system costs while providing a relatively low-risk deployment option for CSP systems.

  6. 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,...

  7. Total Solar Irradiance Variability and the Solar Activity Cycle

    E-Print Network [OSTI]

    Probhas Raychaudhuri

    2006-05-06T23:59:59.000Z

    It is suggested that the solar variability is due to the perturbed nature of the solar core and this variability is provided by the variability of the solar neutrino flux from the solar neutrino detectors i.e., Homestake, Superkamiokande, SAGE and GALLEX-GNO. The solar neutrino flux in the standard solar model (SSM) was calculated on the assumption of L_nu (neutrino luminosity) = L_gamma (optical luminosity) which implies that if there is a change in optical luminosity then solar neutrino flux data will also be changed. An internal dynamo due to the cyclic variation of nuclear energy generation inside the core of the sun is responsible for the solar activity cycle was suggested and thus the internal magnetic field is also variable. Again the changes in the nuclear energy generation induce structural changes that result in variations of the global solar parameters i.e., luminosity, radius and temperatures etc. From the analysis of total solar irradiance (TSI) data during the year from 1970 to 2003 we have found five phases within the solar activity cycle. The first phase (I) starts before two years from the sunspot minimum. The second phase (II) starts at the time of sunspot minimum and phase (III) starts before 2/3 years from sunspot maximum whereas phase (IV) starts at sunspot maximum and fifth phase (V) starts at after 2-3 years from sunspot maximum.

  8. Origin of the Solar System

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

    Materials: The Role of Synchrotron Radiation Analyses in the Study of Our Solar System Stephen R. Sutton University of Chicago APS Colloquium GeoSoilEnviroCARS...

  9. Green Systems Solar Hot Water

    E-Print Network [OSTI]

    Schladow, S. Geoffrey

    Green Systems Solar Hot Water Heating the Building Co-generation: Heat Recovery System: Solar panels not enough Generates heat energy Captures heat from generator and transfers it to water Stores Thermal Panels (Trex enclosure) Hot Water Storage Tank (TS-5; basement) Hot Water Heaters (HW-1

  10. CONTROL SYSTEM FOR SOLAR HEATING and COOLING

    E-Print Network [OSTI]

    Dols, C.

    2010-01-01T23:59:59.000Z

    Research Applied to National Needs. EXPERIMENTAL SYSTEM A generalized system for solar heating and cooling

  11. The Telescope Control System of the New Solar Telescope at Big Bear Solar Observatory

    E-Print Network [OSTI]

    mirror (M1) and its alignment with the secondary mirror (M2) will be actively controlled. HighThe Telescope Control System of the New Solar Telescope at Big Bear Solar Observatory G. Yang*a, J of Technology, 323 Martin Luther King Blvd., Newark, NJ 07104; bBig Bear Solar Observatory, 40386 North Shore

  12. Astrometric solar system anomalies

    SciTech Connect (OSTI)

    Nieto, Michael Martin [Los Alamos National Laboratory; Anderson, John D [PROPULSION LABORATORY

    2009-01-01T23:59:59.000Z

    There are at least four unexplained anomalies connected with astrometric data. perhaps the most disturbing is the fact that when a spacecraft on a flyby trajectory approaches the Earth within 2000 km or less, it often experiences a change in total orbital energy per unit mass. next, a secular change in the astronomical unit AU is definitely a concern. It is increasing by about 15 cm yr{sup -1}. The other two anomalies are perhaps less disturbing because of known sources of nongravitational acceleration. The first is an apparent slowing of the two Pioneer spacecraft as they exit the solar system in opposite directions. Some astronomers and physicists are convinced this effect is of concern, but many others are convinced it is produced by a nearly identical thermal emission from both spacecraft, in a direction away from the Sun, thereby producing acceleration toward the Sun. The fourth anomaly is a measured increase in the eccentricity of the Moon's orbit. Here again, an increase is expected from tidal friction in both the Earth and Moon. However, there is a reported unexplained increase that is significant at the three-sigma level. It is produent to suspect that all four anomalies have mundane explanations, or that one or more anomalies are a result of systematic error. Yet they might eventually be explained by new physics. For example, a slightly modified theory of gravitation is not ruled out, perhaps analogous to Einstein's 1916 explanation for the excess precession of Mercury's perihelion.

  13. SOLAR IRRADIANCE FORECASTING FOR THE MANAGEMENT OF SOLAR ENERGY SYSTEMS

    E-Print Network [OSTI]

    Heinemann, Detlev

    SOLAR IRRADIANCE FORECASTING FOR THE MANAGEMENT OF SOLAR ENERGY SYSTEMS Detlev Heinemann Oldenburg.girodo@uni-oldenburg.de ABSTRACT Solar energy is expected to contribute major shares of the future global energy supply. Due to its and solar energy conversion processes has to account for this behaviour in respective operating strategies

  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. NREL showcase solar systems and energy efficient design

    SciTech Connect (OSTI)

    NONE

    1995-12-31T23:59:59.000Z

    THe Thermal Test Facility at NREL, which should be completed in the summer of 1996, will incorporate natural lighting from clerestories and may other solar and energy-efficiency features; roof-mounted solar collectors, which will be monitored as part of NREL`s work on active solar systems, will help to heat water and interior spaces in the building.

  16. Solar Power Systems Web Monitoring

    E-Print Network [OSTI]

    Kumar, Bimal Aklesh

    2011-01-01T23:59:59.000Z

    All over the world the peak demand load is increasing and the load factor is decreasing year-by-year. The fossil fuel is considered insufficient thus solar energy systems are becoming more and more useful, not only in terms of installation but monitoring of these systems is very crucial. Monitoring becomes very important when there are a large number of solar panels. Monitoring would allow early detection if the output falls below required level or one of the solar panel out of 1000 goes down. In this study the target is to monitor and control a developed solar panel by using available internet foundation. This web-enabled software will provide more flexibility over the system such as transmitting data from panel to the host computer and disseminating information to relevant stake holders barring any geographical barrier. The software would be built around web server with dynamic HTML and JAVA, this paper presents the preliminary design of the proposed system.

  17. Views of the solar system

    SciTech Connect (OSTI)

    Hamilton, C.

    1995-02-01T23:59:59.000Z

    Views of the Solar System has been created as an educational tour of the solar system. It contains images and information about the Sun, planets, moons, asteroids and comets found within the solar system. The image processing for many of the images was done by the author. This tour uses hypertext to allow space travel by simply clicking on a desired planet. This causes information and images about the planet to appear on screen. While on a planet page, hyperlinks travel to pages about the moons and other relevant available resources. Unusual terms are linked to and defined in the Glossary page. Statistical information of the planets and satellites can be browsed through lists sorted by name, radius and distance. History of Space Exploration contains information about rocket history, early astronauts, space missions, spacecraft and detailed chronology tables of space exploration. The Table of Contents page has links to all of the various pages within Views Of the Solar System.

  18. Next generation solar bimodal systems

    SciTech Connect (OSTI)

    Babanin, V.I.; Ender, A.Y.; Kolyshkin, I.N.; Kuznetsov, V.I.; Sitnov, V.I. [Ioffe Physico-Technical Institute, St. Petersburg (Russian Federation); Paramonov, D.V. [Westinghouse Science and Technology Center, Pittsburgh, PA (United States)

    1997-12-31T23:59:59.000Z

    One of the principal advantages of a solar thermal propulsion system as compared to a conventional chemical propulsion one is high specific impulse which is proportional to the square root of a propellant temperature. Obviously, next generation solar propulsion and bimodal systems must take advantage of high and ultra-high temperatures. This requires use of an appropriate energy conversion system capable to take advantage of high temperature potentially achievable in a solar receiver. High efficiency and power density of a high temperature thermionic converter open new perspectives in the development of advanced bimodal power systems having performance significantly higher than that achievable by the state-of-the-art technology. The paper presents an innovative concept of a cascaded solar bimodal power system with a high temperature Cs-Ba thermionic converter. The paper shows that the use of high temperature Knudsen cesium-barium thermionic converter in a solar bimodal system allows to eliminate thermal insulation sleeve, generate electrical power in the propulsion mode, and precise control thermal state of the solar receiver. In the Cs-Ba thermionic converter an electron instability and high amplitude current oscillations develop. These effects can be used to obtain alternate current power directly in the converter. Possibility and potential advantage of such a generator are discussed.

  19. CONTROL SYSTEM FOR SOLAR HEATING and COOLING

    E-Print Network [OSTI]

    Dols, C.

    2010-01-01T23:59:59.000Z

    LBL buildings, with the solar collectors on the roof, theCBB 757-5496 Figure 3: Solar Collectors Mounted· on the RoofSolar Heating and Cooling Systems. The components include Collectors (

  20. Solar-powered cooling system

    DOE Patents [OSTI]

    Farmer, Joseph C

    2013-12-24T23:59:59.000Z

    A solar-powered adsorption-desorption refrigeration and air conditioning system uses nanostructural materials made of high specific surface area adsorption aerogel as the adsorptive media. Refrigerant molecules are adsorbed on the high surface area of the nanostructural material. A circulation system circulates refrigerant from the nanostructural material to a cooling unit.

  1. Odyssey: a Solar System Mission

    E-Print Network [OSTI]

    B. Christophe; P. H. Andersen; J. D. Anderson; S. Asmar; Ph. Bério; O. Bertolami; R. Bingham; F. Bondu; Ph. Bouyer; S. Bremer; J. -M. Courty; H. Dittus; B. Foulon; P. Gil; U. Johann; J. F. Jordan; B. Kent; C. Lämmerzahl; A. Lévy; G. Métris; O. Olsen; J. Pàramos; J. D. Prestage; S. V. Progrebenko; E. Rasel; A. Rathke; S. Reynaud; B. Rievers; E. Samain; T. J. Sumner; S. Theil; P. Touboul; S. Turyshev; P. Vrancken; P. Wolf; N. Yu

    2008-01-18T23:59:59.000Z

    The Solar System Odyssey mission uses modern-day high-precision experimental techniques to test the laws of fundamental physics which determine dynamics in the solar system. It could lead to major discoveries by using demonstrated technologies. The mission proposes to perform a set of precision gravitation experiments from the vicinity of Earth to the outer Solar System. Its scientific objectives can be summarized as follows: i) test of the gravity force law in the Solar System up to and beyond the orbit of Saturn; ii) precise investigation of navigation anomalies at the fly-bys; iii) measurement of Eddington's parameter at occultations; iv) mapping of gravity field in the outer solar system and study of the Kuiper belt. To this aim, the Odyssey mission is built up on a main spacecraft, designed to fly up to 13 AU, with the following components: a) a high-precision accelerometer, with bias-rejection system, measuring the deviation of the trajectory from the geodesics; b) Ka-band transponders, as for Cassini, for a precise range and Doppler measurement up to 13 AU, with additional VLBI equipment; c) optional laser equipment, which would allow one to improve the range and Doppler measurement. In this baseline concept, the main spacecraft is designed to operate beyond the Saturn orbit, up to 13 AU. It experiences multiple planetary fly-bys at Earth, Mars or Venus, and Jupiter. The cruise and fly-by phases allow the mission to achieve its baseline scientific objectives (i) to iii) in the above list). In addition to this baseline concept, the Odyssey mission proposes the release of the Enigma radio-beacon at Saturn, allowing one to extend the deep space gravity test up to at least 50 AU, while achieving the scientific objective of a mapping of gravity field in the outer Solar System.

  2. Does solar structure vary with solar magnetic activity?

    E-Print Network [OSTI]

    Sarbani Basu; Anna Mandel

    2004-11-15T23:59:59.000Z

    We present evidence that solar structure changes with changes in solar activity. We find that the adiabatic index, Gamma_1, changes near the second helium ionization, i.e., at a depth of about 0.98 R_sun. We believe that this change is a result of the change in the effective equation of state caused by magnetic fields. Inversions should be able to detect the changes in Gamma_1 if mode sets with reliable and precise high-degree modes are available.

  3. Decentalized solar photovoltaic energy systems

    SciTech Connect (OSTI)

    Krupka, M. C.

    1980-09-01T23:59:59.000Z

    Environmental data for decentralized solar photovoltaic systems have been generated in support of the Technology Assessment of Solar Energy Systems program (TASE). Emphasis has been placed upon the selection and use of a model residential photovoltaic system to develop and quantify the necessary data. The model consists of a reference home located in Phoenix, AZ, utilizing a unique solar cell array-roof shingle combination. Silicon solar cells, rated at 13.5% efficiency at 28/sup 0/C and 100 mW/cm/sup 2/ (AMI) insolation are used to generate approx. 10 kW (peak). An all-electric home is considered with lead-acid battery storage, dc-ac inversion and utility backup. The reference home is compared to others in regions of different insolation. Major material requirements, scaled to quad levels of end-use energy include significant quantities of silicon, copper, lead, antimony, sulfuric acid and plastics. Operating residuals generated are negligible with the exception of those from the storage battery due to a short (10-year) lifetime. A brief general discussion of other environmental, health, and safety and resource availability impacts is presented. It is suggested that solar cell materials production and fabrication may have the major environmental impact when comparing all facets of photovoltaic system usage. Fabrication of the various types of solar cell systems involves the need, handling, and transportation of many toxic and hazardous chemicals with attendant health and safety impacts. Increases in production of such materials as lead, antimony, sulfuric acid, copper, plastics, cadmium and gallium will be required should large scale usage of photovoltaic systems be implemented.

  4. Is the Solar System Stable ?

    E-Print Network [OSTI]

    Jacques Laskar

    2012-09-26T23:59:59.000Z

    Since the formulation of the problem by Newton, and during three centuries, astronomers and mathematicians have sought to demonstrate the stability of the Solar System. Thanks to the numerical experiments of the last two decades, we know now that the motion of the planets in the Solar System is chaotic, which prohibits any accurate prediction of their trajectories beyond a few tens of millions of years. The recent simulations even show that planetary collisions or ejections are possible on a period of less than 5 billion years, before the end of the life of the Sun.

  5. Photovoltaic solar system connected to the electric power grid operating as active power generator and reactive power compensator

    SciTech Connect (OSTI)

    Albuquerque, Fabio L.; Moraes, Adelio J.; Guimaraes, Geraldo C.; Sanhueza, Sergio M.R.; Vaz, Alexandre R. [Universidade Federal de Uberlandia, Uberlandia-MG, CEP 38400-902 (Brazil)

    2010-07-15T23:59:59.000Z

    In the case of photovoltaic (PV) systems acting as distributed generation (DG) systems, the DC energy that is produced is fed to the grid through the power-conditioning unit (inverter). The majority of contemporary inverters used in DG systems are current source inverters (CSI) operating at unity power factor. If, however, we assume that voltage source inverters (VSI) can replace CSIs, we can generate reactive power proportionally to the remaining unused capacity at any given time. According to the theory of instantaneous power, the inverter reactive power can be regulated by changing the amplitude of its output voltage. In addition, the inverter active power can be adjusted by modifying the phase angle of its output voltage. Based on such theory, both the active power supply and the reactive power compensation (RPC) can be carried out simultaneously. When the insolation is weak or the PV modules are inoperative at night, the RPC feature of a PV system can still be used to improve the inverter utilisation factor. Some MATLAB simulation results are included here to show the feasibility of the method. (author)

  6. Solar powered desalination system

    E-Print Network [OSTI]

    Mateo, Tiffany Alisa

    2011-01-01T23:59:59.000Z

    PEC and PV system. The energy and area requirements for arequires the least energy and area. A MED desalination plantcompare the energy consumption and area of devices needed,

  7. Consumers Power, Inc.- Solar Energy System Rebate

    Broader source: Energy.gov [DOE]

    Consumers Power, Inc. (CPI) offers rebates to its residential customers who install solar water heating systems or solar photovoltaic (PV) systems from October 1, 2012 to September 30, 2013. The...

  8. Studying the Solar System's Chemical Recipe

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

    Studying the Solar System's Chemical Recipe Studying the Solar System's Chemical Recipe Print Tuesday, 26 March 2013 00:00 To study the origins of different isotope ratios among...

  9. CONTROL SYSTEM FOR SOLAR HEATING and COOLING

    E-Print Network [OSTI]

    Dols, C.

    2010-01-01T23:59:59.000Z

    solar heating and cooling systems covering a wide range ofpractical heating and cooling system configurations andexperimental heating and cooling system, the main purpose of

  10. Solar powered desalination system

    E-Print Network [OSTI]

    Mateo, Tiffany Alisa

    2011-01-01T23:59:59.000Z

    2: dual bed colloidal suspension Type 3: fixed flat panel2: dual bed colloidal suspension Type 3: fixed flat panelBed Colloidal Suspension…………….37 Figure 1.18: Type 3 PEC System Reactor, Fixed

  11. SOLAR PROGRAM: SYSTEMS INTEGRATION

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

    2010 2. Current Request for Information (RFI) 3. Questions 4 | Systems Integration eere.energy.gov Summary of 1W Workshop Date: August 11th and 12th, 2010 Attendees: 86 total;...

  12. LANGMUIR WAVE ACTIVITY: COMPARING THE ULYSSES SOLAR MINIMUM AND SOLAR MAXIMUM ORBITS

    E-Print Network [OSTI]

    California at Berkeley, University of

    ). The top three panels correspond to the southern segment of the solar minimum orbit; repeated passesLANGMUIR WAVE ACTIVITY: COMPARING THE ULYSSES SOLAR MINIMUM AND SOLAR MAXIMUM ORBITS R. J at the electron plasma frequency) during the solar minimum and solar maximum orbits of Ulysses. At high latitudes

  13. Roadmap for Solar System Research November 2012

    E-Print Network [OSTI]

    Crowther, Paul

    Roadmap for Solar System Research November 2012 Prepared by the Solar System Advisory Panel) and Stephen Lowry (Kent) #12;Roadmap for Solar System Science November 6, 2012 2 Executive Summary 1 2012, at which the content and structure of the SSAP Roadmap (this document) was discussed. The SSAP

  14. Solar Resource and PV Systems Performance

    E-Print Network [OSTI]

    Solar Resource and PV Systems Performance at Selected Test Sites Prepared for the U.S. Department Subtask 11.1 Deliverables 2 and 4: Report on Solar Resource and PV Systems Performance at Selected Test agency thereof. #12;1 Solar Resource and PV Systems Performance at Selected Test Sites Contents 1

  15. Adaptive, full-spectrum solar energy system

    DOE Patents [OSTI]

    Muhs, Jeffrey D.; Earl, Dennis D.

    2003-08-05T23:59:59.000Z

    An adaptive full spectrum solar energy system having at least one hybrid solar concentrator, at least one hybrid luminaire, at least one hybrid photobioreactor, and a light distribution system operably connected to each hybrid solar concentrator, each hybrid luminaire, and each hybrid photobioreactor. A lighting control system operates each component.

  16. Hybrid solar lighting distribution systems and components

    DOE Patents [OSTI]

    Muhs, Jeffrey D. (Lenoir City, TN); Earl, Dennis D. (Knoxville, TN); Beshears, David L. (Knoxville, TN); Maxey, Lonnie C. (Powell, TN); Jordan, John K. (Oak Ridge, TN); Lind, Randall F. (Lenoir City, TN)

    2011-07-05T23:59:59.000Z

    A hybrid solar lighting distribution system and components having at least one hybrid solar concentrator, at least one fiber receiver, at least one hybrid luminaire, and a light distribution system operably connected to each hybrid solar concentrator and each hybrid luminaire. A controller operates all components.

  17. Hybrid solar lighting systems and components

    DOE Patents [OSTI]

    Muhs, Jeffrey D. (Lenoir City, TN); Earl, Dennis D. (Knoxville, TN); Beshears, David L. (Knoxville, TN); Maxey, Lonnie C. (Powell, TN); Jordan, John K. (Oak Ridge, TN); Lind, Randall F. (Lenoir City, TN)

    2007-06-12T23:59:59.000Z

    A hybrid solar lighting system and components having at least one hybrid solar concentrator, at least one fiber receiver, at least one hybrid luminaire, and a light distribution system operably connected to each hybrid solar concentrator and each hybrid luminaire. A controller operates each component.

  18. CONTROL SYSTEM FOR SOLAR HEATING and COOLING

    E-Print Network [OSTI]

    Dols, C.

    2010-01-01T23:59:59.000Z

    solar heated, boosted, or heated entirely in the auxiliary heater)for the solar-heated hot water. This heater can be seen insolar heating and cooling system, showing plumbing runs containing solenoid valves, auxiliary heater (

  19. Solar Energy Systems Tax Credit (Personal) (Iowa)

    Broader source: Energy.gov [DOE]

    Iowa offers a 15% individual tax credit for solar energy systems. The credit is based on the federal tax credits for solar; individuals can claim 50% of the [http://dsireusa.org/incentives...

  20. SIPS: Solar Irradiance Prediction System Stefan Achleitner

    E-Print Network [OSTI]

    Cerpa, Alberto E.

    SIPS: Solar Irradiance Prediction System Stefan Achleitner Computer Science and Engineering-scaling capacities of renewable energy sources such as wind and solar. However, variability and uncertainty in power potentially limit the impact of fluctuations in solar power generation, specifically in cloudy days when

  1. ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2008 C. Honsberg Solar Radiation

    E-Print Network [OSTI]

    Honsberg, Christiana

    ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2008 C. Honsberg Solar Radiation Solar Radiation: Effects of atmosphere, angular dependence of radiation, variation of solar radiation ­ Calculation of Solar Radiation: · Estimate of intensity of solar radiation · Angular Dependence ­ Solar Noon

  2. 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.

  3. 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.

  4. Solar Leasing for Residential Photovoltaic Systems (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2009-02-01T23:59:59.000Z

    This publication examines the solar lease option for residential PV systems and describes two solar lease programs already in place.

  5. Integrating Solar PV in Utility System Operations

    E-Print Network [OSTI]

    Mills, A.

    2014-01-01T23:59:59.000Z

    Laboratory National Renewable Energy Laboratory Universityof Energy Efficiency and Renewable Energy (Solar EnergySystem Operations Table 27. Renewable Curtailment in the BR

  6. Webinar: Highly Efficient Solar Thermochemical Reaction Systems

    Broader source: Energy.gov [DOE]

    Video recording and text version of the Fuel Cell Technologies Office webinar titled "Highly Efficient Solar Thermochemical Reaction Systems," originally presented on January 13, 2015.

  7. Petrovay: Solar physics Activity phenomena 1 Overall structure: umbra + penumbra.

    E-Print Network [OSTI]

    Petrovay, Kristóf

    Petrovay: Solar physics Activity phenomena 1 SUNSPOTS Overall structure: umbra + penumbra in decaying spots (hysteresis-like behaviour). #12;Petrovay: Solar physics Activity phenomena 1 Temperature, H2, CH, CN Maltby effect: Umbrae slightly hotter in solar maximum than in minimum. Recent studies

  8. Implementations of electric vehicle system based on solar energy in Singapore : assessment of solar photovoltaic systems

    E-Print Network [OSTI]

    Sun, Li

    2009-01-01T23:59:59.000Z

    To evaluate the feasibility of solar energy based Electric Vehicle Transportation System in Singapore, the state of the art Photovoltaic Systems have been reviewed in this report with a focus on solar cell technologies. ...

  9. Roadmap for Solar System Research October 2012

    E-Print Network [OSTI]

    Crowther, Paul

    Roadmap for Solar System Research October 2012 DRAFT Prepared by the Solar System Advisory Panel the content and structure of the SSAP Roadmap (this document) was discussed. The SSAP drafted the Roadmap as a guide and a template for this Roadmap. 3. Three overarching themes were identified which encompass

  10. Solar Energy Systems - Research - Systems Analysis - Smart Grid...

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

    Solar Energy Systems U.S. Department of Energy Search Argonne ... Search Argonne Home > SES Home Research Home Photovoltaics Transparent Conductors Concentrating Sunlight Systems...

  11. Solar Energy System and Cogeneration System Personal Property Tax Credit

    Broader source: Energy.gov [DOE]

    Eligible solar systems Solar energy is defined by D.C. Code § 34-1431 to mean "radiant energy, direct, diffuse, or reflected, received from the sun at wavelengths suitable for conversion into the...

  12. An analysis of distributed solar fuel systems

    E-Print Network [OSTI]

    Thomas, Alex, S.M. Massachusetts Institute of Technology

    2012-01-01T23:59:59.000Z

    While solar fuel systems offer tremendous potential to address global clean energy needs, most existing analyses have focused on the feasibility of large centralized systems and applications. Not much research exists on ...

  13. Solar activity and earth rotation variability R. Abarca del Rioa,

    E-Print Network [OSTI]

    Dai, Aiguo

    to secular times scales, meteorological and climatic data are correlated with solar variability (see reviews changes in solar output could be amplified in the Earth's atmosphere. In fact, at wavelengths not visibleSolar activity and earth rotation variability R. Abarca del Rioa, *, D. Gambisb , D. Salsteinc , P

  14. The solar interior - radial structure, rotation, solar activity cycle

    E-Print Network [OSTI]

    Axel Brandenburg

    2007-03-28T23:59:59.000Z

    Some basic properties of the solar convection zone are considered and the use of helioseismology as an observational tool to determine its depth and internal angular velocity is discussed. Aspects of solar magnetism are described and explained in the framework of dynamo theory. The main focus is on mean field theories for the Sun's magnetic field and its differential rotation.

  15. active 8b solar: Topics by E-print Network

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

    Sudbury Neutrino Observatory (SNO) has precisely determined the total active (nux) 8B solar neutrino flux without assumptions about the energy dependence of the nue survival...

  16. Solar Power Systems Find A Professional Solar Energy Installer For Any

    E-Print Network [OSTI]

    Lovley, Derek

    Solar Power Systems Find A Professional Solar Energy Installer For Any Type Of System www.CleanEnergyAuthority.com Install Solar Panels Enter Your Zip Code & Connect To Pre-Screened Solar Panel Installers www.ServiceMagic.com Biomass Pumps Reliable metering for apps from microflow to scale-up & pilot plant www.isco.com The Solar

  17. Integrated Solar Thermochemical Reaction System for High Efficiency...

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

    Integrated Solar Thermochemical Reaction System for High Efficiency Production of Electricity Integrated Solar Thermochemical Reaction System for High Efficiency Production of...

  18. Solar Leasing for Residential Photovoltaic Systems

    Broader source: Energy.gov [DOE]

    This publication examines the solar lease option for residential PV systems and describes two solar lease programs already in place. As a result of the $2,000 cap on the residential ITC being lifted in 2009, the expansion of the solar lease model across the United States may be slower than anticipated. The lease model, though, still offers homeowners some distinct advantages. This publication helps homeowners revisit the comparison between the solar lease and home-equity financing in light of the change to the ITC.

  19. Revisiting the question: Does high-latitude solar activity lead low-latitude solar activity in time phase?

    SciTech Connect (OSTI)

    Kong, D. F.; Qu, Z. N. [Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011 (China); Guo, Q. L., E-mail: kdf@ynao.ac.cn [College of Mathematics Physics and Information Engineering, Jiaxing University, Jiaxing 314001 (China)

    2014-05-01T23:59:59.000Z

    Cross-correlation analysis and wavelet transform methods are used to investigate whether high-latitude solar activity leads low-latitude solar activity in time phase or not, using the data of the Carte Synoptique solar filaments archive from 1919 March to 1989 December. From the cross-correlation analysis, high-latitude solar filaments have a time lead of 12 Carrington solar rotations with respect to low-latitude ones. Both the cross-wavelet transform and wavelet coherence indicate that high-latitude solar filaments lead low-latitude ones in time phase. Furthermore, low-latitude solar activity is better correlated with high-latitude solar activity of the previous cycle than with that of the following cycle, which is statistically significant. Thus, the present study confirms that high-latitude solar activity in the polar regions is indeed better correlated with the low-latitude solar activity of the following cycle than with that of the previous cycle, namely, leading in time phase.

  20. Innovative Systems for Solar Air Conditioning of Buildings

    E-Print Network [OSTI]

    Kessling, W.; Peltzer, M.

    2004-01-01T23:59:59.000Z

    for a high efficient utilization of solar thermal energy. To show the today's and near future potential innovative solar cooling and air conditioning systems are discussed which are well adapted to the utilization of solar energy. The system performance...

  1. Market development directory for solar industrial process heat systems

    SciTech Connect (OSTI)

    None

    1980-02-01T23:59:59.000Z

    The purpose of this directory is to provide a basis for market development activities through a location listing of key trade associations, trade periodicals, and key firms for three target groups. Potential industrial users and potential IPH system designers were identified as the prime targets for market development activities. The bulk of the directory is a listing of these two groups. The third group, solar IPH equipment manufacturers, was included to provide an information source for potential industrial users and potential IPH system designers. Trade associates and their publications are listed for selected four-digit Standard Industrial Code (SIC) industries. Since industries requiring relatively lower temperature process heat probably will comprise most of the near-term market for solar IPH systems, the 80 SIC's included in this chapter have process temperature requirements less than 350/sup 0/F. Some key statistics and a location list of the largest plants (according to number of employees) in each state are included for 15 of the 80 SIC's. Architectural/engineering and consulting firms are listed which are known to have solar experience. Professional associated and periodicals to which information on solar IPH sytstems may be directed also are included. Solar equipment manufacturers and their associations are listed. The listing is based on the SERI Solar Energy Information Data Base (SEIDB).

  2. Solar Wind: Manifestations of Solar Activity E N CYC LO PE D IA O F AS T R O N O MY AN D AS T R O PHYS I C S Solar Wind: Manifestations of Solar

    E-Print Network [OSTI]

    Webb, David F.

    Solar Wind: Manifestations of Solar Activity E N CYC LO PE D IA O F AS T R O N O MY AN D AS T R O PHYS I C S Solar Wind: Manifestations of Solar Activity The Sun's outer atmosphere, the corona, is continually heated and expands to create the solar wind. Solar activity waxes and wanes with the 11 yr cycle

  3. REAL-TIME, WEB BASED ENERGY MONITORING SYSTEM FOR A SOLAR ACADEMIC BUILDING John H. Scofield

    E-Print Network [OSTI]

    Scofield, John H.

    Field Station incorporates passive solar cooling and active solar heating, maximizes ergonomicREAL-TIME, WEB BASED ENERGY MONITORING SYSTEM FOR A SOLAR ACADEMIC BUILDING John H. Scofield. The Leslie Shao-ming Sun Field Station is a 9,800 sf single- story building designed to help Jasper Ridge

  4. Property Tax Exemption for Residential Solar Systems

    Broader source: Energy.gov [DOE]

    [http://www.nmlegis.gov/Sessions/10%20Regular/final/HB0233.pdf HB 233 of 2010] exempted residential solar energy systems from property tax assessments. According to state law, for the purposes of...

  5. Cutting Industrial Solar System Costs in Half

    E-Print Network [OSTI]

    Niess, R. C.; Weinstein, A.

    1982-01-01T23:59:59.000Z

    While there are technical, social, environmental and institutional barriers to the widespread use of solar systems, the principle barrier is economic. For commercial and industrial firms to turn to this alternate energy source, the first cost must...

  6. Property Tax Exclusion for Solar Energy Systems

    Broader source: Energy.gov [DOE]

    Section 73 of the California Revenue and Taxation Code allows a property tax exclusion for certain types of solar energy systems installed between January 1, 1999, and December 31, 2016. This sec...

  7. Highly Efficient Solar Thermochemical Reaction Systems

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

    Highly Efficient, Solar Thermochemical Reaction Systems (2014 R&D 100 Award Winner) U.S. Department of Energy Fuel Cell Technologies Office 2 Question and Answer * Please type your...

  8. Igneous processes of the early solar system

    E-Print Network [OSTI]

    Singletary, Steven J. (Steven James), 1973-

    2004-01-01T23:59:59.000Z

    Experimental, petrographic and numerical methods are used to explore the igneous evolution of the early solar system. Chapters 1 and 2 detail the results of petrographic and experimental studies of a suite of primitive ...

  9. First Rocks from Outside the Solar System

    SciTech Connect (OSTI)

    Westphal, Andrew

    2014-10-17T23:59:59.000Z

    Andrew Westphal presents his findings in examining the first rocks from outside the solar system at our '8 Big Ideas' Science at the Theater event on October 8th, 2014, in Oakland, California.

  10. Webinar: Highly Efficient Solar Thermochemical Reaction Systems

    Broader source: Energy.gov [DOE]

    The Fuel Cell Technologies Office will present a live webinar titled "Highly Efficient Solar Thermochemical Reaction Systems" on Tuesday, January 13, from 12:00 to 1:00 p.m. Eastern Standard Time.

  11. The solar system mimics a hydrogen atom

    E-Print Network [OSTI]

    Je-An Gu

    2014-03-28T23:59:59.000Z

    The solar system and the hydrogen atom are two well known systems on different scales and look unrelated: The former is a classical system on the scale of about billions of kilometers and the latter a quantum system of about tens of picometers. Here we show a connection between them. Specifically, we find that the orbital radii of the planets mimic the mean radii of the energy levels of a quantum system under the Coulomb-like potential. This connection might be explained by very light dark matter which manifests quantum behavior in the solar system, thereby hinting at a dark matter mass around $8 \\times 10^{-14}$ electron-volts.

  12. Environmental Assessment and Metrics for Solar: Case Study of SolFocus Solar Concentrator Systems

    E-Print Network [OSTI]

    Reich-Weiser, Corinne; Dornfeld, David; Horne, Steve

    2008-01-01T23:59:59.000Z

    Greenhouse gas analysis of solar-thermal electricity gen-CdTe Concentrator PV Solar Thermal Wind Coal CC Gas Turbinefor the assessment of thermal solar systems,” Proceedings of

  13. Tehachapi solar thermal system first annual report

    SciTech Connect (OSTI)

    Rosenthal, A. [Southwest Technology Development Inst., Las Cruces, NM (US)

    1993-05-01T23:59:59.000Z

    The staff of the Southwest Technology Development Institute (SWTDI), in conjunction with the staff of Industrial Solar Technology (IST), have analyzed the performance, operation, and maintenance of a large solar process heat system in use at the 5,000 inmate California Correctional Institution (CCI) in Tehachapi, CA. This report summarizes the key design features of the solar plant, its construction and maintenance histories through the end of 1991, and the performance data collected at the plant by a dedicated on-site data acquisition system (DAS).

  14. ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2008 C. Honsberg Solar Cell Operation

    E-Print Network [OSTI]

    Honsberg, Christiana

    is lost as heat. energy Eg 2 31 Absorption process #12;ELEG620: Solar Electric Systems UniversityELEG620: Solar Electric Systems University of Delaware, ECE Spring 2008 C. Honsberg Solar Cell and shunt resistance). #12;ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2008 C

  15. INVENTORY OF SOLAR RADIATION/SOLAR ENERGY SYSTEMS ESTIMATORS, MODELS, SITE-SPECIFIC DATA, AND PUBLICATIONS

    E-Print Network [OSTI]

    INVENTORY OF SOLAR RADIATION/SOLAR ENERGY SYSTEMS ESTIMATORS, MODELS, SITE-SPECIFIC DATA, and Buildings Systems Integration Center National Renewable Energy Laboratory 8 July 2009 SOLAR SYSTEM POTENTIAL/calculators/PVWATTS/version1/ http://rredc.nrel.gov/solar/calculators/PVWATTS/version2/ Estimates the electrical energy

  16. GONG p-mode frequency changes with solar activity

    E-Print Network [OSTI]

    A. Bhatnagar; Kiran Jain; S. C. Tripathy

    1999-04-01T23:59:59.000Z

    We present a correlation analysis of GONG p-mode frequencies with nine solar activity indices for the period 1995 August to 1997 August. This study includes spherical harmonic degree in the range 2 to 150 and the frequency range of 1500-3500 \\mu Hz. Using three statistical tests, the measured mean frequency shifts show strong to good correlation with activity indices. A decrease of 0.06 \\mu Hz in frequency, during the descending phase of solar cycle 22 and an increase of 0.04 \\mu Hz in the ascending phase of solar cycle 23 is observed. These results provide the first evidence for change in p-mode frequencies around the declining phase of solar cycle 22 and beginning of new cycle 23. This analysis further confirms that the temporal behaviour of the solar frequency shifts closely follow the phase of the solar activity cycle.

  17. Review of legal and institutional issues in the use of decentralized solar energy systems

    SciTech Connect (OSTI)

    Schweitzer, M.

    1980-04-01T23:59:59.000Z

    The legal and institutional issues involved in the use of decentralized solar energy systems are examined for the purpose of advising government planners and policymakers, the solar industry, solar researchers, and prospective solar users of present and potential impediments and incentives to solar commercialization. This information was gathered primarily through a comprehensive literature review, with supplementary data provided through interviews with representatives of organizations active in the solar field. Five major issue areas were identified in the course of this study: (1) prohibitions on the use of solar equipment, (2) regulation of the production and placement of solar systems, (3) access to sunlight, (4) financial incentives and impediments to the use of solar technologies, and (5) the public utility-solar user interface. Each can be important in its impacts on the incidence of solar usage. The major actors involved with the issues identified above represent both the private and public sectors. Important private sector participants include solar manufacturers and installers, labor unions, lending institutions, utility companies, solar users themselves, and other community property owners. In the public sector, local, state, and federal governments are all capable of acting in ways that can influence the solar commercialization effort. Implementation options are available for all levels of government seeking to take an active role in addressing the previously mentioned legal and institutional issues. The appropriate actions will vary from federal to state to local governments, but each level can be important in removing existing barriers and creating new incentives for solar use.

  18. The Solar System Presentation for SRS 5th Grade

    E-Print Network [OSTI]

    Cohen, David

    The Solar System Presentation for SRS 5th Grade Prof. David Cohen, Swarthmore College #12;What astronomers try to answer: ·What are the things in the solar system like? Planets, moons, comets, asteroids, the Sun... ·Are there good conditions for life anywhere in the solar system? ·How did the solar system

  19. Solar thermal power systems. Annual technical progress report, FY 1979

    SciTech Connect (OSTI)

    Braun, Gerald W.

    1980-06-01T23:59:59.000Z

    The Solar Thermal Power Systems Program is the key element in the national effort to establish solar thermal conversion technologies within the major sectors of the national energy market. It provides for the development of concentrating mirror/lens heat collection and conversion technologies for both central and dispersed receiver applications to produce electricity, provide heat at its point of use in industrial processes, provide heat and electricity in combination for industrial, commercial, and residential needs, and ultimately, drive processes for production of liquid and gaseous fuels. This report is the second Annual Technical Progress Report for the Solar Thermal Power Systems Program and is structured according to the organization of the Solar Thermal Power Systems Program on September 30, 1979. Emphasis is on the technical progress of the projects rather than on activities and individual contractor efforts. Each project description indicates its place in the Solar Thermal Power Systems Program, a brief history, the significant achievements and real progress during FY 1979, also future project activities as well as anticipated significant achievements are forecast. (WHK)

  20. Homeowners Guide to Leasing a Solar Electric System (Brochure)

    SciTech Connect (OSTI)

    Not Available

    2014-07-01T23:59:59.000Z

    This updated fact sheet provides an introduction to solar leases for homeowners who are considering installing a solar electric system on their home.

  1. Soiling losses for solar photovoltaic systems in California

    E-Print Network [OSTI]

    Mejia, Felipe A; Kleissl, Jan

    2013-01-01T23:59:59.000Z

    power output from 186 PV sites demonstrated how soiling decreases the efficiency of solarPower Output of Distributed PV Systems in California. Report to the California Solar

  2. Solar-Electric Dish Stirling System Development

    SciTech Connect (OSTI)

    Mancini, T.R.

    1997-12-31T23:59:59.000Z

    Electrical power generated with the heat from the sun, called solar thermal power, is produced with three types of concentrating solar systems - trough or line-focus systems; power towers in which a centrally-located thermal receiver is illuminated with a large field of sun-tracking heliostats; and dish/engine systems. A special case of the third type of system, a dish/Stirling system, is the subject of this paper. A dish/Stirling system comprises a parabolic dish concentrator, a thermal receiver, and a Stirling engine/generator located at the focus of the dish. Several different dish/Stirling systems have been built and operated during the past 15 years. One system claims the world record for net conversion of solar energy to electric power of 29.4%; and two different company`s systems have accumulated thousands of hours of on-sun operation. Due to de-regulation and intense competition in global energy markets as well as the immaturity of the technology, dish/Stirling systems have not yet found their way into the marketplace. This situation is changing as solar technologies become more mature and manufacturers identify high-value niche markets for their products. In this paper, I review the history of dish/Stirling system development with an emphasis on technical and other issues that directly impact the Stirling engine. I also try to provide some insight to the opportunities and barriers confronting the application of dish/Stirling in power generation markets.

  3. IntrAst1 (Petrovay) Chracteristics and origon of the Solar System SOLAR SYSTEM BODIES

    E-Print Network [OSTI]

    Petrovay, Kristóf

    ) Chracteristics and origon of the Solar System CHEMICAL DIFFERENTIATION IN THE SOLAR SYSTEM Chemical choose from theoretical models, based on empirical constraints. Constraints: > surface, gravity field mostly consist of ice. beyond r 30 AU methane ice also persists. Volatiles: gas or liquid at room

  4. The complex planetary synchronization structure of the solar system

    E-Print Network [OSTI]

    Nicola Scafetta

    2014-01-16T23:59:59.000Z

    The complex planetary synchronization structure of the solar system, which since Pythagoras of Samos (ca. 570-495 BC) is known as the music of the spheres, is briefly reviewed from the Renaissance up to contemporary research. Copernicus' heliocentric model from 1543 suggested that the planets of our solar system form a kind of mutually ordered and quasi-synchronized system. From 1596 to 1619 Kepler formulated preliminary mathematical relations of approximate commensurabilities among the planets, which were later reformulated in the Titius-Bode rule (1766-1772) that successfully predicted the orbital position of Ceres and Uranus. Following the discovery of the ~11 yr sunspot cycle, in 1859 Wolf suggested that the observed solar variability could be approximately synchronized with the orbital movements of Venus, Earth, Jupiter and Saturn. Modern research have further confirmed that: (1) the planetary orbital periods can be approximately deduced from a simple system of resonant frequencies; (2) the solar system oscillates with a specific set of gravitational frequencies, and many of them (e.g. within the range between 3 yr and 100 yr) can be approximately constructed as harmonics of a base period of ~178.38 yr; (3) solar and climate records are also characterized by planetary harmonics from the monthly to the millennia time scales. This short review concludes with an emphasis on the contribution of the author's research on the empirical evidences and physical modeling of both solar and climate variability based on astronomical harmonics. The general conclusion is that the solar system works as a resonator characterized by a specific harmonic planetary structure that synchronizes also the Sun's activity and the Earth's climate.

  5. The Solar Wind, CMEs and the Origins of Heliospheric Activity

    E-Print Network [OSTI]

    release o Coronal holes o Source of high-speed solar wind #12;peter.gallagher@tcd.ie #12;#12;peter Parker => Parker Spiral: r - r0 = -(v/ )( - 0) o Winding angle: o Inclined at ~45º at 1 AU and ~90º by 10The Solar Wind, CMEs and the Origins of Heliospheric Activity Peter T. Gallagher School of Physics

  6. The Solar Thermal Design Assistance Center report of its activities and accomplishments in Fiscal Year 1993

    SciTech Connect (OSTI)

    Menicucci, D.F.

    1994-03-01T23:59:59.000Z

    The Solar Thermal Design Assistance Center (STDAC) at Sandia National Laboratories is a resource provided by the US Department of Energy`s Solar Thermal Program. Its major objectives are to accelerate the use of solar thermal systems through (a) direct technical assistance to users, (b) cooperative test, evaluation, and development efforts with private industry, and (c) educational outreach activities. This report outlines the major activities and accomplishments of the STDAC in Fiscal Year 1993. The report also contains a comprehensive list of persons who contacted the STDAC by telephone for information or technical consulting.

  7. Active imaging system with Faraday filter

    DOE Patents [OSTI]

    Snyder, J.J.

    1993-04-13T23:59:59.000Z

    An active imaging system has a low to medium powered laser transmitter and receiver wherein the receiver includes a Faraday filter with an ultranarrow optical bandpass and a bare (nonintensified) CCD camera. The laser is locked in the vicinity of the passband of the Faraday filter. The system has high sensitivity to the laser illumination while eliminating solar background.

  8. The Changing Perception of the Solar System

    E-Print Network [OSTI]

    Nesvorny, D

    2015-01-01T23:59:59.000Z

    The solar system has changed dramatically since its birth, and so did our understanding of it. A considerable research effort has been invested in the past decade in an attempt to reconstruct the solar system history, including the earliest stages some 4.5 billion years ago. The results indicate how several processes, such as planetary migration and dynamical instabilities, acted to relax the orbital spacing of the outer planets, and provided the needed perturbation to explain the present planetary orbits that are not precisely circular and coplanar. Here we highlight this work and illustrate the key results in a computer simulation that unifies several recently developed theories. The emerging view represents another step away from the initial perception of the solar system as part of unchanging heavens.

  9. Solar air heating system for combined DHW and space heating

    E-Print Network [OSTI]

    Solar air heating system for combined DHW and space heating solar air collector PV-panel fannon-return valve DHW tank mantle cold waterhot water roof Solar Energy Centre Denmark Danish Technological Institute SEC-R-29 #12;Solar air heating system for combined DHW and space heating Søren Østergaard Jensen

  10. On the Solar System-Debris Disk Connecction

    E-Print Network [OSTI]

    Amaya Moro-Martin

    2007-12-14T23:59:59.000Z

    This paper emphasizes the connection between solar and extra-solar debris disks: how models and observations of the Solar System are helping us understand the debris disk phenomenon, and vice versa, how debris disks are helping us place our Solar System into context.

  11. High throughput solar cell ablation system

    DOE Patents [OSTI]

    Harley, Gabriel; Pass, Thomas; Cousins, Peter John; Viatella, John

    2012-09-11T23:59:59.000Z

    A solar cell is formed using a solar cell ablation system. The ablation system includes a single laser source and several laser scanners. The laser scanners include a master laser scanner, with the rest of the laser scanners being slaved to the master laser scanner. A laser beam from the laser source is split into several laser beams, with the laser beams being scanned onto corresponding wafers using the laser scanners in accordance with one or more patterns. The laser beams may be scanned on the wafers using the same or different power levels of the laser source.

  12. High throughput solar cell ablation system

    DOE Patents [OSTI]

    Harley, Gabriel; Pass, Thomas; Cousins, Peter John; Viatella, John

    2014-10-14T23:59:59.000Z

    A solar cell is formed using a solar cell ablation system. The ablation system includes a single laser source and several laser scanners. The laser scanners include a master laser scanner, with the rest of the laser scanners being slaved to the master laser scanner. A laser beam from the laser source is split into several laser beams, with the laser beams being scanned onto corresponding wafers using the laser scanners in accordance with one or more patterns. The laser beams may be scanned on the wafers using the same or different power levels of the laser source.

  13. SOLARIZE RALEIGH PILOT PROGRAM DRAFT Request for Proposals from Installers of Residential Solar Photovoltaic Systems

    E-Print Network [OSTI]

    solar photovoltaic ("PV") installation companies ("Installer(s)") or teams of installation companiesSOLARIZE RALEIGH PILOT PROGRAM DRAFT Request for Proposals from Installers of Residential Solar Photovoltaic Systems Proposed Posting Date: February 4, 2014 I. OPPORTUNITY SUMMARY: The North Carolina Solar

  14. 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

    for Storage of Solar Thermal Energy,” Solar Energy, 18 (3),Toward Molecular Solar-Thermal Energy Storage,” Angewandtescale molecular solar thermal energy storage system, in

  15. Comparison Between TRNSYS Software Simulation and F-Chart Program on Solar Domestic Hot Water System

    E-Print Network [OSTI]

    Haberl, J. S.; Baltazar, J. C.; Mao, C.

    2012-01-01T23:59:59.000Z

    This study presents the accuracy test of a TRNSYS Solar Domestic Hot Water (SDHW) System simulation. The testing is based on comparing the results with the F-Chart software. The selected system to carry out the tests was the Active Solar Domestic...

  16. Comparison Between TRNSYS Software Simulation and F-Chart Program on Solar Domestic Hot Water System 

    E-Print Network [OSTI]

    Haberl, J. S.; Baltazar, J. C.; Mao, C.

    2012-01-01T23:59:59.000Z

    This study presents the accuracy test of a TRNSYS Solar Domestic Hot Water (SDHW) System simulation. The testing is based on comparing the results with the F-Chart software. The selected system to carry out the tests was the Active Solar Domestic...

  17. Active optical zoom system

    DOE Patents [OSTI]

    Wick, David V.

    2005-12-20T23:59:59.000Z

    An active optical zoom system changes the magnification (or effective focal length) of an optical imaging system by utilizing two or more active optics in a conventional optical system. The system can create relatively large changes in system magnification with very small changes in the focal lengths of individual active elements by leveraging the optical power of the conventional optical elements (e.g., passive lenses and mirrors) surrounding the active optics. The active optics serve primarily as variable focal-length lenses or mirrors, although adding other aberrations enables increased utility. The active optics can either be LC SLMs, used in a transmissive optical zoom system, or DMs, used in a reflective optical zoom system. By appropriately designing the optical system, the variable focal-length lenses or mirrors can provide the flexibility necessary to change the overall system focal length (i.e., effective focal length), and therefore magnification, that is normally accomplished with mechanical motion in conventional zoom lenses. The active optics can provide additional flexibility by allowing magnification to occur anywhere within the FOV of the system, not just on-axis as in a conventional system.

  18. Statement of work for solar thermal power systems and photovoltaic solar-energy systems technical support services

    SciTech Connect (OSTI)

    none,

    1982-01-01T23:59:59.000Z

    Work is broken down in the following areas: solar thermal central receiver systems analysis; advanced solar thermal systems analysis and engineering; thermal power systems support; total energy systems mission analysis; irrigation and small community mission analysis; photovoltaics mission analysis; Solar Thermal Test Facility and Central Receiver Pilot Plant systems engineering. (LEW)

  19. The Inner Solar System Characteristics of Earth

    E-Print Network [OSTI]

    Walter, Frederick M.

    The Inner Solar System #12;The Earth #12;Characteristics of Earth A terrestrial, rocky planet floats on mantle · Crust is created and destroyed #12;Characteristics of Earth Today Surface: · 70% water · 30% land Atmosphere: ·77% N2 ·21% O2 ·0.1% H2O ·+Ar, CO2, Ne #12;The Dynamic Earth Molten Core

  20. Cutting Industrial Solar System Costs in Half 

    E-Print Network [OSTI]

    Niess, R. C.; Weinstein, A.

    1982-01-01T23:59:59.000Z

    collectors that result in an installed first cost that approximates one half of that of conventional solar systems. This technology is now available for producing up to 220 F hot water for industrial process heat, space heating, and service hot water heating...

  1. Solar Photovoltaic (PV) System Permit Application Checklist

    Broader source: Energy.gov [DOE]

    The Permit Application Checklist is intended to be used as a best management practice when establishing local government requirements for residential and commercial solar photovoltaic (PV) system permits. Local governments may modify this checklist to accommodate their local ordinances, code requirements, and permit procedures.

  2. Active solar heating and cooling information user study

    SciTech Connect (OSTI)

    Belew, W.W.; Wood, B.L.; Marle, T.L.; Reinhardt, C.L.

    1981-01-01T23:59:59.000Z

    The results of a series of telephone interviews with groups of users of information on active solar heating and cooling (SHAC). An earlier study identified the information user groups in the solar community and the priority (to accelerate solar energy commercialization) of getting information to each group. In the current study only high-priority groups were examined. Results from 19 SHAC groups respondents are analyzed in this report: DOE-Funded Researchers, Non-DOE-Funded Researchers, Representatives of Manufacturers (4 groups), Distributors, Installers, Architects, Builders, Planners, Engineers (2 groups), Representatives of Utilities, Educators, Cooperative Extension Service County Agents, Building Owners/Managers, and Homeowners (2 groups). The data will be used as input to the determination of information products and services the Solar Energy Research Institute, the Solar Energy Information Data Bank Network, and the entire information outreach community should be preparing and disseminating.

  3. The HARPS search for southern extra-solar planets XXXV. Planetary systems and stellar activity of the M dwarfs GJ 3293, GJ 3341, and GJ 3543

    E-Print Network [OSTI]

    Astudillo-Defru, N; Delfosse, X; Segransan, D; Forveille, T; Bouchy, F; Gillon, M; Lovis, C; Mayor, M; Neves, V; Pepe, F; Perrier, C; Queloz, D; Rojo, P; Santos, N C; Udry, S

    2014-01-01T23:59:59.000Z

    Context. Planetary companions of a fixed mass induce larger amplitude reflex motions around lower-mass stars, which helps make M dwarfs excellent targets for extra-solar planet searches. State of the art velocimeters with $\\sim$1m/s stability can detect very low-mass planets out to the habitable zone of these stars. Low-mass, small, planets are abundant around M dwarfs, and most known potentially habitable planets orbit one of these cool stars. Aims. Our M-dwarf radial velocity monitoring with HARPS on the ESO 3.6m telescope at La Silla observatory makes a major contribution to this sample. Methods. We present here dense radial velocity (RV) time series for three M dwarfs observed over $\\sim5$ years: GJ 3293 (0.42M$_\\odot$), GJ 3341 (0.47M$_\\odot$), and GJ 3543 (0.45M$_\\odot$). We extract those RVs through minimum $\\chi^2$ matching of each spectrum against a high S/N ratio stack of all observed spectra for the same star. We then vet potential orbital signals against several stellar activity indicators, to dis...

  4. Massachusetts Policy Guidance for Regulating Solar Energy Systems

    Broader source: Energy.gov [DOE]

    This policy guidance was established to summarize, explain, and help communities apply four of the Massachusetts statutes that apply to solar energy systems. These statutes include: Chapter 40A Section 3 (solar exemptions), Chapter 40A Section 9B (solar access), Chapter 187 Section 1A (solar easements), and Chapter 40C (Historic Districts).

  5. Concentrated Solar Power Generation Systems: The SAIC Dish

    E-Print Network [OSTI]

    Hemmers, Oliver

    Concentrated Solar Power Generation Systems: The SAIC Dish Center for Energy Research at UNLV #12;Concentrating Solar Dishes Work has been underway at UNLV's Center for Energy Research since 2001 in the use of concentrating solar dishes for electrical power generation. One of these solar dishes was marketed by Science

  6. Estimating electric current densities in solar active regions

    E-Print Network [OSTI]

    Wheatland, M S

    2015-01-01T23:59:59.000Z

    Electric currents in solar active regions are thought to provide the energy released via magnetic reconnection in solar flares. Vertical electric current densities $J_z$ at the photosphere may be estimated from vector magnetogram data, subject to substantial uncertainties. The values provide boundary conditions for nonlinear force- free modelling of active region magnetic fields. A method is presented for estimating values of $J_z$ taking into account uncertainties in vector magnetogram field values, and minimizing $J_z^2$ across the active region. The method is demonstrated using the boundary values of the field for a force-free twisted bipole, with the addition of noise at randomly chosen locations.

  7. Solar thermophotovoltaic space power system

    SciTech Connect (OSTI)

    Horne, W.E. (Boeing Aerospace Co., Seattle, WA); Day, A.C. (NASA, Marshall Space Flight Center, Huntsville, AL)

    1980-01-01T23:59:59.000Z

    A study has been performed on the technical feasibility and cost of a TPV system for an alternative space power supply. An analysis of six previous studies has been performed and a consistent optical, thermal, and electrical model developed. A search of the literature for materials data has been augmented by an experimental test program on materials and breadboard subsystems of the TPV. These data have been used in the model to determine the technical feasibility and the degree of performance that might be expected from such a system. A system design study was then conducted to optimize the launch configuration, the weight, and the cost of the TPV space power system. Results from this study were used to define a specific design which could be used in a detailed cost analysis. A cost analysis was then performed to determine the relative costs of the TPV power system. It appears that a system having a specific power greater than 150 W/kg can be produced for approximately 30 dollars per watt.

  8. Handbook of experiences in the design and installation of solar heating and cooling systems

    SciTech Connect (OSTI)

    Ward, D.S.; Oberoi, H.S.

    1980-07-01T23:59:59.000Z

    A large array of problems encountered are detailed, including design errors, installation mistakes, cases of inadequate durability of materials and unacceptable reliability of components, and wide variations in the performance and operation of different solar systems. Durability, reliability, and design problems are reviewed for solar collector subsystems, heat transfer fluids, thermal storage, passive solar components, piping/ducting, and reliability/operational problems. The following performance topics are covered: criteria for design and performance analysis, domestic hot water systems, passive space heating systems, active space heating systems, space cooling systems, analysis of systems performance, and performance evaluations. (MHR)

  9. 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...

  10. STATE OF CALIFORNIA SOLAR DOMESTIC HOT WATER SYSTEMS (SDHW)

    E-Print Network [OSTI]

    attached CEC F-Chart) # of Collectors in System Collector Size Solar Tank Volume (gallons) §150(j)1B piping shall be insulated. §150(j)4: Solar water-heating system and/or/collectors are certifiedSTATE OF CALIFORNIA SOLAR DOMESTIC HOT WATER SYSTEMS (SDHW) CEC- CF-6R-MECH-02 (Revised 08

  11. Science Expo 2014: Brief Activity Descriptions Earth Systems and Geology Activities

    E-Print Network [OSTI]

    Schladow, S. Geoffrey

    this process. 5. Birdseed Mining: Students "mine" for beads and seeds within a birdseed mixture to learn about models demonstrate the magnetic field, paired with Tahoe Institute for Natural Science activity on birds seasons. 30. Pocket Solar System: Students create a scale model of the solar system with a meter of paper

  12. THE EXPANSION OF ACTIVE REGIONS INTO THE EXTENDED SOLAR CORONA

    SciTech Connect (OSTI)

    Morgan, Huw; Jeska, Lauren; Leonard, Drew, E-mail: hmorgan@aber.ac.uk [Sefydliad Mathemateg a Ffiseg, Prifysgol Aberystwyth, Ceredigion SY23 3BZ (United Kingdom)

    2013-06-01T23:59:59.000Z

    Advanced image processing of Large Angle and Spectrometric Coronagraph Experiment (LASCO) C2 observations reveals the expansion of the active region closed field into the extended corona. The nested closed-loop systems are large, with an apparent latitudinal extent of 50 Degree-Sign , and expanding to heights of at least 12 R{sub Sun }. The expansion speeds are {approx}10 km s{sup -1} in the AIA/SDO field of view, below {approx}20 km s{sup -1} at 2.3 R{sub Sun }, and accelerate linearly to {approx}60 km s{sup -1} at 5 R{sub Sun }. They appear with a frequency of one every {approx}3 hr over a time period of around three days. They are not coronal mass ejections (CMEs) since their gradual expansion is continuous and steady. They are also faint, with an upper limit of 3% of the brightness of background streamers. Extreme ultraviolet images reveal continuous birth and expansion of hot, bright loops from a new active region at the base of the system. The LASCO images show that the loops span a radial fan-like system of streamers, suggesting that they are not propagating within the main coronal streamer structure. The expanding loops brighten at low heights a few hours prior to a CME eruption, and the expansion process is temporarily halted as the closed field system is swept away. Closed magnetic structures from some active regions are not isolated from the extended corona and solar wind, but can expand to large heights in the form of quiescent expanding loops.

  13. NREL: International Activities - India Solar Resource Maps

    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 Office of Science (SC)Integrated CodesTransparency Visit |Infrastructure TheSolar Energy MenuInternational

  14. Solar System Constraints on Disformal Gravity Theories

    E-Print Network [OSTI]

    Hiu Yan Ip; Jeremy Sakstein; Fabian Schmidt

    2015-07-02T23:59:59.000Z

    Disformal theories of gravity are scalar-tensor theories where the scalar couples derivatively to matter via the Jordan frame metric. These models have recently attracted interest in the cosmological context since they admit accelerating solutions. We derive the solution for a static isolated mass in generic disformal gravity theories and transform it into the parameterised post-Newtonian form. This allows us to investigate constraints placed on such theories by local tests of gravity. The tightest constraints come from preferred-frame effects due to the motion of the Solar System with respect to the evolving cosmological background field. The constraints we obtain improve upon the previous solar system constraints by two orders of magnitude, and constrain the scale of the disformal coupling for generic models to $\\mathcal{M} \\gtrsim 100$ eV. These constraints render all disformal effects irrelevant for cosmology.

  15. Solar System constraints to nonminimally coupled gravity

    E-Print Network [OSTI]

    Orfeu Bertolami; Riccardo March; Jorge Páramos

    2013-06-05T23:59:59.000Z

    We extend the analysis of Chiba, Smith and Erickcek \\cite{CSE} of Solar System constraints on $f(R)$ gravity to a class of nonminimally coupled (NMC) theories of gravity. These generalize $f(R)$ theories by replacing the action functional of General Relativity (GR) with a more general form involving two functions $f^1(R)$ and $f^2(R)$ of the Ricci scalar curvature $R$. While the function $f^1(R)$ is a nonlinear term in the action, analogous to $f(R)$ gravity, the function $f^2(R)$ yields a NMC between the matter Lagrangian density $\\LL_m$ and the scalar curvature. The developed method allows for obtaining constraints on the admissible classes of functions $f^1(R)$ and $f^2(R)$, by requiring that predictions of NMC gravity are compatible with Solar System tests of gravity. We apply this method to a NMC model which accounts for the observed accelerated expansion of the Universe.

  16. Solar System Constraints on Disformal Gravity Theories

    E-Print Network [OSTI]

    Ip, Hiu Yan; Schmidt, Fabian

    2015-01-01T23:59:59.000Z

    Disformal theories of gravity are scalar-tensor theories where the scalar couples derivatively to matter via the Jordan frame metric. These models have recently attracted interest in the cosmological context since they admit accelerating solutions. We derive the solution for a static isolated mass in generic disformal gravity theories and transform it into the parameterised post-Newtonian form. This allows us to investigate constraints placed on such theories by local tests of gravity. The tightest constraints come from preferred-frame effects due to the motion of the Solar System with respect to the evolving cosmological background field. The constraints we obtain improve upon the previous solar system constraints by two orders of magnitude, and constrain the scale of the disformal coupling for generic models to $\\mathcal{M} \\gtrsim 100$ eV. These constraints render all disformal effects irrelevant for cosmology.

  17. Solar system constraints on Rindler acceleration

    E-Print Network [OSTI]

    Sante Carloni; Daniel Grumiller; Florian Preis

    2011-05-09T23:59:59.000Z

    We discuss the classical tests of general relativity in the presence of Rindler acceleration. Among these tests the perihelion shifts give the tightest constraints and indicate that the Pioneer anomaly cannot be caused by a universal solar system Rindler acceleration. We address potential caveats for massive test-objects. Our tightest bound on Rindler acceleration that comes with no caveats is derived from radar echo delay and yields |a|<3nm/s^2.

  18. Gravitational Anomalies in the Solar System?

    E-Print Network [OSTI]

    Lorenzo Iorio

    2015-03-16T23:59:59.000Z

    Mindful of the anomalous perihelion precession of Mercury discovered by U. Le Verrier in the second half of the nineteenth century and its successful explanation by A. Einstein with his General Theory of Relativity in the early years of the twentieth century, discrepancies among observed effects in our Solar system and their theoretical predictions on the basis of the currently accepted laws of gravitation applied to known bodies have the potential of paving the way for remarkable advances in fundamental physics. This is particularly important now more than ever, given that most of the Universe seems to be made of unknown substances dubbed Dark Matter and Dark Energy. Should this not be directly the case, Solar system's anomalies could anyhow lead to advancements in cumulative science, as shown to us by the discovery of Neptune in the first half of the nineteenth century. Moreover, investigations in one of such directions can serendipitously enrich the other one as well. The current status of some alleged gravitational anomalies in the Solar system is critically reviewed. They are: a) Possible anomalous advances of planetary perihelia; b) Unexplained orbital residuals of a recently discovered moon of Uranus (Mab); c) The lingering unexplained secular increase of the eccentricity of the orbit of the Moon; d) The so-called Faint Young Sun Paradox; e) The secular decrease of the mass parameter of the Sun; f) The Flyby Anomaly; g) The Pioneer Anomaly; and h) The anomalous secular increase of the astronomical unit

  19. As of October 17, 2012 Solar System Exploration @50

    E-Print Network [OSTI]

    :45 ­ 11:45 am Panel #1: Politics and Policy in the Conduct of Solar System Exploration Panel Chair: Marcia, and Solar System Exploration Panel Chair: Heidi Hammel (Association of Universities for Research And Mars: The Soviet Planetary Exploration Enterprise 9:30 ­ 11:30 am Panel 4: Exploring the Outer Solar

  20. Soiling losses for solar photovoltaic systems in California

    E-Print Network [OSTI]

    Mejia, Felipe A; Kleissl, Jan

    2013-01-01T23:59:59.000Z

    on Large Grid-Connected Photovoltaic Systems in Californiaof Dust on Solar Photovoltaic (PV) Performance: Researchclimatology in design of photovoltaic systems. In: Markvart

  1. Tuning energy transport in solar thermal systems using nanostructured materials

    E-Print Network [OSTI]

    Lenert, Andrej

    2014-01-01T23:59:59.000Z

    Solar thermal energy conversion can harness the entire solar spectrum and theoretically achieve very high efficiencies while interfacing with thermal storage or back-up systems for dispatchable power generation. Nanostructured ...

  2. Solar energy system performance evaluation: seasonal report for IBM System 4 at Clinton, Mississippi

    SciTech Connect (OSTI)

    None

    1980-07-01T23:59:59.000Z

    The IBM System 4 Solar Energy System was designed to provide 35 percent of the space heating and 62 percent of the domestic hot water (DHW) preheating for a single-family residence located within the United States. The system is a prepackaged unit called the Remote Solar Assembly which has been integrated into the heating and DHW system in a dormitory in Clinton, Mississippi. The system consists of 259 square feet of Solaron 2001 Series flat-plate-air collectors, a rock thermal storage containing 5 1/2 ton of rock, heat exchangers, blowers, a 52 gallon preheat tank, controls, and associated plumbing, two 30 gallon electric water heaters draw water from the preheat tank. A 20 kilowatt, duct mounted, electric heater supplies auxiliary energy. This system which has three modes of system operation was activated September, 1978. A system performance assessment is presented.

  3. CONTROL SYSTEM FOR SOLAR HEATING and COOLING

    E-Print Network [OSTI]

    Dols, C.

    2010-01-01T23:59:59.000Z

    for the solar-heated hot water. This heater can be seen inwater (solar heated, boosted, or heated entirely in the auxiliary heater)

  4. THE MAGNETIC ENERGY-HELICITY DIAGRAM OF SOLAR ACTIVE REGIONS

    SciTech Connect (OSTI)

    Tziotziou, Kostas; Georgoulis, Manolis K. [Research Center for Astronomy and Applied Mathematics (RCAAM), Academy of Athens, 4 Soranou Efesiou Street, Athens, GR-11527 (Greece); Raouafi, Nour-Eddine [Johns Hopkins University Applied Physics Laboratory (JHU/APL), 11100 Johns Hopkins Rd. Laurel, MD 20723-6099 (United States)

    2012-11-01T23:59:59.000Z

    Using a recently proposed nonlinear force-free method designed for single-vector magnetograms of solar active regions, we calculate the instantaneous free magnetic energy and relative magnetic helicity budgets in 162 vector magnetograms corresponding to 42 different active regions. We find a statistically robust, monotonic correlation between the free magnetic energy and the relative magnetic helicity in the studied regions. This correlation implies that magnetic helicity, in addition to free magnetic energy, may be an essential ingredient for major solar eruptions. Eruptive active regions appear well segregated from non-eruptive ones in both free energy and relative helicity with major (at least M-class) flares occurring in active regions with free energy and relative helicity exceeding 4 Multiplication-Sign 10{sup 31} erg and 2 Multiplication-Sign 10{sup 42} Mx{sup 2}, respectively. The helicity threshold agrees well with estimates of the helicity contents of typical coronal mass ejections.

  5. SOLAR ENERGY PROGRAM: CHAPTER FROM THE ENERGY AND ENVIRONMENT ANNUAL REPORT 1979

    E-Print Network [OSTI]

    Authors, Various

    2010-01-01T23:59:59.000Z

    Suspensions for Solar Energy Collection A. Hunt . . .Strategies for Active Solar Energy Systems M. Warren, S.Workshop on Control of Solar Energy Systems for Heating and

  6. Solar Energy Program: Chapter from the Energy and Environmental Division Annual Report 1980

    E-Print Network [OSTI]

    Energy and Environment Division

    1981-01-01T23:59:59.000Z

    SOLAR ENERGY PROGRAM PERSONNEL Small Particle SuspensionsStrategies for Active Solar Energy Systems M. Warren, S.Systems Analysis," Solar Energy Research Institute Report

  7. GLOBAL DYNAMICS OF SUBSURFACE SOLAR ACTIVE REGIONS

    SciTech Connect (OSTI)

    Jouve, L. [UPS-OMP, Institut de Recherche en Astrophysique et Planetologie, Universite de Toulouse CNRS, 14 Avenue Edouard Belin, F-31400 Toulouse (France)] [UPS-OMP, Institut de Recherche en Astrophysique et Planetologie, Universite de Toulouse CNRS, 14 Avenue Edouard Belin, F-31400 Toulouse (France); Brun, A. S. [Laboratoire AIM, CEA/DSM-CNRS-Universite Paris Diderot, IRFU/SAp, F-91191 Gif sur Yvette (France)] [Laboratoire AIM, CEA/DSM-CNRS-Universite Paris Diderot, IRFU/SAp, F-91191 Gif sur Yvette (France); Aulanier, G., E-mail: ljouve@irap.omp.eu [LESIA, Observatoire de Paris, CNRS, UPMC, Universite Paris-Diderot, 5 Place Jules Janssen, F-92190 Meudon Cedex (France)

    2013-01-01T23:59:59.000Z

    We present three-dimensional numerical simulations of a magnetic loop evolving in either a convectively stable or unstable rotating shell. The magnetic loop is introduced into the shell in such a way that it is buoyant only in a certain portion in longitude, thus creating an {Omega}-loop. Due to the action of magnetic buoyancy, the loop rises and develops asymmetries between its leading and following legs, creating emerging bipolar regions whose characteristics are similar to those of observed spots at the solar surface. In particular, we self-consistently reproduce the creation of tongues around the spot polarities, which can be strongly affected by convection. We further emphasize the presence of ring-shaped magnetic structures around our simulated emerging regions, which we call 'magnetic necklace' and which were seen in a number of observations without being reported as of today. We show that those necklaces are markers of vorticity generation at the periphery and below the rising magnetic loop. We also find that the asymmetry between the two legs of the loop is crucially dependent on the initial magnetic field strength. The tilt angle of the emerging regions is also studied in the stable and unstable cases and seems to be affected both by the convective motions and the presence of a differential rotation in the convective cases.

  8. Passive solar systems performance under conditions in Bulgaria

    SciTech Connect (OSTI)

    Lekov, A.B.; Balcomb, J.D.

    1989-12-01T23:59:59.000Z

    This paper presents energy performance of 12 passive solar systems for three climatically different zones of Bulgaria. The results are compared with a base-case residential house that has a design typical for these areas. The different passive solar systems are compared on the basis of the percentage of solar savings and the yield, which is the annual net benefit of adding the passive solar system. The analyses are provided based on monthly meteorological data, and the method used for calculations is the Solar Load Ratio. Recommendations for Bulgarian conditions are given. 5 refs., 4 figs., 1 tab.

  9. Installation package for a Sunspot Cascade Solar Water Heating System

    SciTech Connect (OSTI)

    None

    1980-09-01T23:59:59.000Z

    Elcam, Incorporated of Santa Barbara, California, has developed two solar water heating systems. The systems have been installed at Tempe, Arizona and San Diego, California. The systems consist of the following: collector, collector-tank water loop, solar tank, conventional tank and controls. General guidelines are provided which may be utilized in development of detailed instalation plans and specifications. In addition, it provides instruction on operation, maintenance and installation of solar hot water systems.

  10. SOLAR MAGNETIC ACTIVITY CYCLES, CORONAL POTENTIAL FIELD MODELS AND ERUPTION RATES

    SciTech Connect (OSTI)

    Petrie, G. J. D. [National Solar Observatory, Tucson, AZ 85719 (United States)

    2013-05-10T23:59:59.000Z

    We study the evolution of the observed photospheric magnetic field and the modeled global coronal magnetic field during the past 3 1/2 solar activity cycles observed since the mid-1970s. We use synoptic magnetograms and extrapolated potential-field models based on longitudinal full-disk photospheric magnetograms from the National Solar Observatory's three magnetographs at Kitt Peak, the Synoptic Optical Long-term Investigations of the Sun vector spectro-magnetograph, the spectro-magnetograph and the 512-channel magnetograph instruments, and from Stanford University's Wilcox Solar Observatory. The associated multipole field components are used to study the dominant length scales and symmetries of the coronal field. Polar field changes are found to be well correlated with active fields over most of the period studied, except between 2003 and 2006 when the active fields did not produce significant polar field changes. Of the axisymmetric multipoles, only the dipole and octupole follow the poles whereas the higher orders follow the activity cycle. All non-axisymmetric multipole strengths are well correlated with the activity cycle. The tilt of the solar dipole is therefore almost entirely due to active-region fields. The axial dipole and octupole are the largest contributors to the global field except while the polar fields are reversing. This influence of the polar fields extends to modulating eruption rates. According to the Computer Aided CME Tracking, Solar Eruptive Event Detection System, and Nobeyama radioheliograph prominence eruption catalogs, the rate of solar eruptions is found to be systematically higher for active years between 2003 and 2012 than for those between 1997 and 2002. This behavior appears to be connected with the weakness of the late-cycle 23 polar fields as suggested by Luhmann. We see evidence that the process of cycle 24 field reversal is well advanced at both poles.

  11. Active Solar Heating Basics | Department of Energy

    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 on Delicious Rank EERE: Alternative Fuels DataEnergyDepartment ofATVM LoanActive Financial Assistance

  12. Enolia Solar Systems | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluating A PotentialJump to:Emminol JumpEnergyEnerleyEnglehard/ICCEnolia Solar Systems

  13. Studying the Solar System's Chemical Recipe

    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 Our InstagramStructure of All-Polymer. . ~0s ALAMOSStudying the Solar System's

  14. Studying the Solar System's Chemical Recipe

    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 Office of ScienceandMesa del SolStrengthening a solid ... StrengtheningLab (NewportStudying the Solar System's

  15. 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

    Nocera D. G. , 2010, “Solar Energy Supply and Storage forof Abiotic Photo-chemical Solar Energy Storage Systems,”Power Plants,” Journal of Solar Energy Engineering, 124 (2),

  16. 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

  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

    Organometallic Frames for Solar Energy Storage, Berkeley. [Nocera D. G. , 2010, “Solar Energy Supply and Storage forof Abiotic Photo-chemical Solar Energy Storage Systems,”

  18. Survey and evaluation of available thermal insulation materials for use on solar heating and cooling systems

    SciTech Connect (OSTI)

    Not Available

    1980-03-01T23:59:59.000Z

    This is the final report of a survey and evaluation of insulation materials for use with components of solar heating and cooling systems. The survey was performed by mailing questionnaires to manufacturers of insulation materials and by conducting an extensive literature search to obtain data on relevant properties of various types of insulation materials. The study evaluated insulation materials for active and passive solar heating and cooling systems and for multifunction applications. Primary and secondary considerations for selecting insulation materials for various components of solar heating and cooling systems are presented.

  19. Solar central receiver systems comparative economics

    SciTech Connect (OSTI)

    Eicker, P J

    1980-04-01T23:59:59.000Z

    Several major conceptual design studies of solar central receiver systems and components have been completed in the last year. The results of these studies are used to compare the projected cost of electric power generation using central receiver systems with that of more conventional power generation. The cost estimate for a molten salt central receiver system is given. Levelized busbar energy cost is shown as a function of annual capacity factor indicating the fraction of the cost due to each of the subsystems. The estimated levelized busbar energy cost for a central receiver (70 to 90 mills per kilowatt hour) is compared with the levelized busbar energy cost for a new coal fired Rankine cycle plant. Sensitivities to the initial cost of coal and the delta fuel escalation are shown. (WHK)

  20. Chaotic Disintegration of the Inner Solar System

    E-Print Network [OSTI]

    Batygin, Konstantin; Holman, Mathew J

    2014-01-01T23:59:59.000Z

    On timescales that greatly exceed an orbital period, typical planetary orbits evolve in a stochastic yet stable fashion. On even longer timescales, however, planetary orbits can spontaneously transition from bounded to unbound chaotic states. Large-scale instabilities associated with such behavior appear to play a dominant role in shaping the architectures of planetary systems, including our own. Here we show how such transitions are possible, focusing on the specific case of the long-term evolution of Mercury. We develop a simple analytical model for Mercury's dynamics and elucidate the origins of its short term stochastic behavior as well as of its sudden progression to unbounded chaos. Our model allows us to estimate the timescale on which this transition is likely to be triggered, i.e. the dynamical lifetime of the Solar System as we know it. The formulated theory is consistent with the results of numerical simulations and is broadly applicable to extrasolar planetary systems dominated by secular interact...

  1. Solar-energy-system performance evaluation, Cathedral Square, Burlington, Vermont, July-December 1981

    SciTech Connect (OSTI)

    Welch, K.M.

    1981-01-01T23:59:59.000Z

    The Cathedral Square solar site is a 10-story multiunit apartment building in Vermont. Its active solar energy system is designed to supply 51% of the hot water load, and consists of 1798 square feet of flat plate collectors, 2699-gallon water tank in an enclosed mechanical room on the roof, and two auxiliary natural gas boilers to supply hot water to immersed heat exchanger in an auxiliary storage tank. The measured solar fraction was only 28%, not 51%, which, it is concluded, is an unreasonable expectation. Other performance data include the solar savings ratio, conventional fuel savings, system performance factor, and solar system coefficient of performance. Monthly performance data are given for the solar system overall, and for the collector, storage, and hot water subsystems. Also included are insolation data, typical storage fluid temperatures, domestic hot water consumption, and solar heat exchangers inlet/outlet temperatures, and typical domestic hot water subsystem temperatures. In addition, the system operating sequence and solar energy utilization are given. Appended are a system description, performance evaluation techniques, long-term weather data. (LEW)

  2. Solar wind samples give insight into birth of solar system

    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 Office of ScienceandMesa del Sol HomeFacebookScholarship Fund3Biology|Solar wind samples Solar wind samples give

  3. 9,400 years of cosmic radiation and solar activity from ice cores and tree rings

    E-Print Network [OSTI]

    Wehrli, Bernhard

    9,400 years of cosmic radiation and solar activity from ice cores and tree rings Friedhelm) Understanding the temporal variation of cosmic radiation and solar activity during the Holocene is essential the history of cosmic radiation and solar activity over many millennia. Although records from different

  4. Prediction of solar activity for the next 500 years Friedhelm Steinhilber1

    E-Print Network [OSTI]

    Wehrli, Bernhard

    Prediction of solar activity for the next 500 years Friedhelm Steinhilber1 and Jürg Beer1 Received of solar activity has been reconstructed for the past 9400 years by combining two 10 Be records from of mean solar magnetic activity averaged over 22 years for the next 500 years mainly based on the spectral

  5. Gravitational Anomalies in the Solar System?

    E-Print Network [OSTI]

    Iorio, Lorenzo

    2014-01-01T23:59:59.000Z

    Mindful of the anomalous perihelion precession of Mercury discovered by U. Le Verrier in the second half of the nineteenth century and its successful explanation by A. Einstein with his General Theory of Relativity in the early years of the twentieth century, discrepancies among observed effects in our Solar system and their theoretical predictions on the basis of the currently accepted laws of gravitation applied to known bodies have the potential of paving the way for remarkable advances in fundamental physics. This is particularly important now more than ever, given that most of the Universe seems to be made of unknown substances dubbed Dark Matter and Dark Energy. Should this not be directly the case, Solar system's anomalies could anyhow lead to advancements in cumulative science, as shown to us by the discovery of Neptune in the first half of the nineteenth century. Moreover, investigations in one of such directions can serendipitously enrich the other one as well. The current status of some alleged gra...

  6. Optimization of Multiple Receivers Solar Power Tower systems

    E-Print Network [OSTI]

    2015-04-08T23:59:59.000Z

    Apr 8, 2015 ... Solar Power Tower (SPT) systems are known as one of the most promising ...... An appropriate control is required to adapt the mass flow in the ...

  7. EIS-0416: Ivanpah Solar Electric Generating System in San Bernardino...

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

    Available for Download October 22, 2010 EIS-0416: EPA Notice of Availability of the Final Environmental Impact Statement Ivanpah Solar Electric Generating System (07-AFC-5)...

  8. Soiling losses for solar photovoltaic systems in California

    E-Print Network [OSTI]

    Mejia, Felipe A; Kleissl, Jan

    2013-01-01T23:59:59.000Z

    on Solar Photovoltaic (PV) Performance: Research Status,Photovoltaic Systems in California Felipe A Mejia, Jan Kleissl Keywords: Soiling, PV Performance

  9. Optimization of Multiple Receivers Solar Power Tower systems

    E-Print Network [OSTI]

    Emilio Carrizosa

    2015-03-26T23:59:59.000Z

    Mar 26, 2015 ... Abstract: In this article a new procedure to optimize the design of a Multiple Receivers Solar Power Tower system is presented. The proposed ...

  10. City of Portland- Streamlined Building Permits for Residential Solar Systems

    Broader source: Energy.gov [DOE]

    The City of Portland's Bureau of Development Services (BDS) developed an electronic permitting process for residential solar energy system installations. With this streamlined, expedited process,...

  11. Implementation of optimum solar electricity generating system

    SciTech Connect (OSTI)

    Singh, Balbir Singh Mahinder, E-mail: balbir@petronas.com.my; Karim, Samsul Ariffin A., E-mail: samsul-ariffin@petronas.com.my [Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 31750 Bandar Seri Iskandar, Perak (Malaysia); Sivapalan, Subarna, E-mail: subarna-sivapalan@petronas.com.my [Department of Management and Humanities, Universiti Teknologi PETRONAS, 31750 Bandar Seri Iskandar, Perak (Malaysia); Najib, Nurul Syafiqah Mohd; Menon, Pradeep [Department of Electrical and Electronics Engineering, Universiti Teknologi PETRONAS, 31750 Bandar Seri Iskandar, Perak (Malaysia)

    2014-10-24T23:59:59.000Z

    Under the 10{sup th} Malaysian Plan, the government is expecting the renewable energy to contribute approximately 5.5% to the total electricity generation by the year 2015, which amounts to 98MW. One of the initiatives to ensure that the target is achievable was to establish the Sustainable Energy Development Authority of Malaysia. SEDA is given the authority to administer and manage the implementation of the feed-in tariff (FiT) mechanism which is mandated under the Renewable Energy Act 2011. The move to establish SEDA is commendable and the FiT seems to be attractive but there is a need to create awareness on the implementation of the solar electricity generating system (SEGS). In Malaysia, harnessing technologies related to solar energy resources have great potential for implementation. However, the main issue that plagues the implementation of SEGS is the intermittent nature of this source of energy. The availability of sunlight is during the day time, and there is a need for electrical energy storage system, so that there is electricity available during the night time as well. The meteorological condition such as clouds, haze and pollution affects the SEGS as well. The PV based SEGS is seems to be promising electricity generating system that can contribute towards achieving the 5.5% target and will be able to minimize the negative effects of utilizing fossil fuels for electricity generation on the environment. Malaysia is committed to Kyoto Protocol, which emphasizes on fighting global warming by achieving stabilization of greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system. In this paper, the technical aspects of the implementation of optimum SEGS is discussed, especially pertaining to the positioning of the PV panels.

  12. Reliability Evaluation of Electric Power Generation Systems with Solar Power 

    E-Print Network [OSTI]

    Samadi, Saeed

    2013-11-08T23:59:59.000Z

    reliability evaluation of generation systems including Photovoltaic (PV) and Concentrated Solar Power (CSP) plants. Unit models of PV and CSP are developed first, and then generation system model is constructed to evaluate the reliability of generation systems...

  13. From the center of Earth to the rim of the solar system, Earth and Space Sciences furthers our understanding of Earth, the solar system, and their histories. Based on the geologic record

    E-Print Network [OSTI]

    Anderson, Richard

    From the center of Earth to the rim of the solar system, Earth and Space Sciences furthers our understanding of Earth, the solar system, and their histories. Based on the geologic record and on rigorous observation and modeling of Earth's present state, our activities cut across traditional disciplines

  14. Progress in passive solar energy systems. Volume 8. Part 1

    SciTech Connect (OSTI)

    Hayes, J.; Andrejko, D.A.

    1983-01-01T23:59:59.000Z

    This book presents the papers given at a conference sponsored by the US DOE, the Solar Energy Research Institute, SolarVision, Inc., and the Southern California Solar Energy Society. The topics considered at the conference included sizing solar energy systems for agricultural applications, a farm scale ethanol production plant, the EEC wind energy RandD program, the passive solar performance assessment of an earth-sheltered house, the ARCO 1 MW photovoltaic power plant, the performance of a dendritic web photovoltaic module, second generation point focused concentrators, linear fresnel lens concentrating photovoltaic collectors, photovoltaic conversion efficiency, amorphous silicon thin film solar cells, a photovoltaic system for a shopping center, photovoltaic power generation for the utility industry, spectral solar radiation, and the analysis of insolation data.

  15. Organic solar cells: An overview focusing on active layer morphology Travis L. Benanti & D. Venkataraman*

    E-Print Network [OSTI]

    Venkataraman, Dhandapani "DV"

    Review Organic solar cells: An overview focusing on active layer morphology Travis L. Benanti & D/acceptor blend, morphology, photovoltaic devices, plastic solar cells, thin films Abstract Solar cells heterojunction concept. This review provides an overview of organic solar cells. Topics covered include: a brief

  16. Solar heating and cooling of residential buildings: design of systems, 1980 edition

    SciTech Connect (OSTI)

    None

    1980-09-01T23:59:59.000Z

    This manual was prepared primarily for use in conducting a practical training course on the design of solar heating and cooling systems for residential and small office buildings, but may also be useful as a general reference text. The content level is appropriate for persons with different and varied backgrounds, although it is assumed that readers possess a basic understanding of heating, ventilating, and air-conditioning systems of conventional (non-solar) types. This edition is a revision of the manual with the same title, first printed and distributed by the US Government Printing Office in October 1977. The manual has been reorganized, new material has been added, and outdated information has been deleted. Only active solar systems are described. Liquid and air-heating solar systems for combined space and service water heating or service water heating are included. Furthermore, only systems with proven experience are discussed to any extent.

  17. Solar-Type Activity: Epochs of Cycle Formation

    E-Print Network [OSTI]

    Katsova, M M; Livshits, M A

    2015-01-01T23:59:59.000Z

    The diagram of indices of coronal and chromospheric activity allowed us to reveal stars where solar-type activity appears and regular cycles are forming. Using new consideration of a relation between coronal activity and the rotation rate, together with new data on the ages of open clusters, we estimate the age of the young Sun corresponding to the epoch of formation of its cycle. The properties of the activity of this young Sun, with an age slightly older than one billion years, are briefly discussed. An analysis of available data on the long-term regular variability of late-type stars leads to the conclusion that duration of a cycle associated with solar-type activity increases with the deceleration of the stellar rotation; i.e., with age. New data on the magnetic fields of comparatively young G stars and changes in the role of the large-scale and the local magnetic fields in the formation of the activity of the young Sun are discussed. Studies in this area aim to provide observational tests aimed at identi...

  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

    solar electric systems currently use photovoltaics almostCHP) systems can compete or exceed solar photovoltaics (systems, and in generalized comparisons to photovoltaics. In

  19. SOLAR ROTATION RATE DURING THE CYCLE 24 MINIMUM IN ACTIVITY

    SciTech Connect (OSTI)

    Antia, H. M. [Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005 (India); Basu, Sarbani, E-mail: antia@tifr.res.i, E-mail: sarbani.basu@yale.ed [Department of Astronomy, Yale University, P.O. Box 208101, New Haven CT 06520-8101 (United States)

    2010-09-01T23:59:59.000Z

    The minimum of solar cycle 24 is significantly different from most other minima in terms of its duration as well as its abnormally low levels of activity. Using available helioseismic data that cover epochs from the minimum of cycle 23 to now, we study the differences in the nature of the solar rotation between the minima of cycles 23 and 24. We find that there are significant differences between the rotation rates during the two minima. There are differences in the zonal-flow pattern too. We find that the band of fast rotating region close to the equator bifurcated around 2005 and recombined by 2008. This behavior is different from that during the cycle 23 minimum. By autocorrelating the zonal-flow pattern with a time shift, we find that in terms of solar dynamics, solar cycle 23 lasted for a period of 11.7 years, consistent with the result of Howe et al. (2009). The autocorrelation coefficient also confirms that the zonal-flow pattern penetrates through the convection zone.

  20. A stock water solar heating system

    SciTech Connect (OSTI)

    Nydahl, J.; Carlson, B.

    1999-07-01T23:59:59.000Z

    This paper reports on the progress in the development of an inexpensive but rugged solar system to heat stock water. Insulation encased in fiber reinforced concrete is the main structural component for the collector and the partition between the unheated stock tank and the heated section. A fully wetted, drain-back collector was designed to produce a high optical efficiency and to permit its water passage to be opened for cleaning. A unique double-glazed design is used in which the inner glazing is a film with a large thermal expansion coefficient. This causes a significant drop in the stagnation temperatures since a single glazed configuration is approached at high temperatures. The collector and the partially covered insulated tank prevented freezing, and held the average water temperature at 6.4 C (44 F) during the day while the mean daily ambient temperature was {minus}5.4 C (22 F) over a nine day test.

  1. Solar system tests of brane world models

    E-Print Network [OSTI]

    Christian G. Boehmer; Tiberiu Harko; Francisco S. N. Lobo

    2008-02-05T23:59:59.000Z

    The classical tests of general relativity (perihelion precession, deflection of light, and the radar echo delay) are considered for the Dadhich, Maartens, Papadopoulos and Rezania (DMPR) solution of the spherically symmetric static vacuum field equations in brane world models. For this solution the metric in the vacuum exterior to a brane world star is similar to the Reissner-Nordstrom form of classical general relativity, with the role of the charge played by the tidal effects arising from projections of the fifth dimension. The existing observational solar system data on the perihelion shift of Mercury, on the light bending around the Sun (obtained using long-baseline radio interferometry), and ranging to Mars using the Viking lander, constrain the numerical values of the bulk tidal parameter and of the brane tension.

  2. Testing for wSolar System

    E-Print Network [OSTI]

    Jerome Martin; Carlo Schimd; Jean-Philippe Uzan

    2005-10-07T23:59:59.000Z

    In scalar-tensor theories of gravity, the equation of state of dark energy, w, can become smaller than -1 without violating any energy condition. The value of w today is tied to the level of deviations from general relativity which, in turn, is constrained by solar system and pulsars timing experiments. The conditions on these local constraints for w to be significantly less than -1 are established. It is demonstrated that this requires to consider theories that differ from the Jordan-Fierz-Brans-Dicke theory and that involve either a steep coupling function or a steep potential. It is also shown how a robust measurement of w could probe scalar-tensor theories.

  3. Chaotic Disintegration of the Inner Solar System

    E-Print Network [OSTI]

    Konstantin Batygin; Alessandro Morbidelli; Mathew J. Holman

    2014-11-18T23:59:59.000Z

    On timescales that greatly exceed an orbital period, typical planetary orbits evolve in a stochastic yet stable fashion. On even longer timescales, however, planetary orbits can spontaneously transition from bounded to unbound chaotic states. Large-scale instabilities associated with such behavior appear to play a dominant role in shaping the architectures of planetary systems, including our own. Here we show how such transitions are possible, focusing on the specific case of the long-term evolution of Mercury. We develop a simple analytical model for Mercury's dynamics and elucidate the origins of its short term stochastic behavior as well as of its sudden progression to unbounded chaos. Our model allows us to estimate the timescale on which this transition is likely to be triggered, i.e. the dynamical lifetime of the Solar System as we know it. The formulated theory is consistent with the results of numerical simulations and is broadly applicable to extrasolar planetary systems dominated by secular interactions. These results constitute a significant advancement in our understanding of the processes responsible for sculpting of the dynamical structures of generic planetary systems.

  4. Thermoeconomic Analysis of a Solar Heat-Pump System 

    E-Print Network [OSTI]

    Gao, Y.; Wang, S.

    2006-01-01T23:59:59.000Z

    This paper introduces a solar energy heat-pump system and analyzes the thermoeconomics. The results show that the solar energy heat-pump system can be operated in different modes and used for room heating in winter and cooling in summer and...

  5. SURVEILLANCE OF PHOTOVOLTAIC SOLAR ENERGY SYSTEMS USING METEOSAT DERIVED IRRADIANCES

    E-Print Network [OSTI]

    Heinemann, Detlev

    SURVEILLANCE OF PHOTOVOLTAIC SOLAR ENERGY SYSTEMS USING METEOSAT DERIVED IRRADIANCES Annette Hammer.Heinemann@uni-oldenburg.de 2Enecolo AG, Lindhof 235, CH-8617 M¨onchaltorf 3Fraunhofer Insitute for Solar Energy Systems Wiemken3, Hans Georg Beyer4, Vincent van Dijk5, Jethro Betcke5 1Dept. of Energy and Semiconductor Research

  6. Thermoeconomic Analysis of a Solar Heat-Pump System

    E-Print Network [OSTI]

    Gao, Y.; Wang, S.

    2006-01-01T23:59:59.000Z

    This paper introduces a solar energy heat-pump system and analyzes the thermoeconomics. The results show that the solar energy heat-pump system can be operated in different modes and used for room heating in winter and cooling in summer and...

  7. Design package for solar domestic hot water system

    SciTech Connect (OSTI)

    None

    1980-09-01T23:59:59.000Z

    Information used to evaluate the initial design of the Elcam, Inc., Solar Domestic Hot Water System is presented. Included are such items as the system performance specification, detailed design drawings and other information. Elcam, Inc., has developed two solar heated prototype hot water systems and two heat exchangers. The hot water systems consist of the following subsystems: collector, storage, control, transport, auxiliary energy, and government-furnished Site Data Acquisition. The two systems are installed at Tempe, Arizona, and San Diego, California.

  8. The Science of Solar As part of its public outreach activities, the UC Davis-UC Santa Cruz Solar Collaborative wishes to provide up-to-date,

    E-Print Network [OSTI]

    The Science of Solar As part of its public outreach activities, the UC Davis-UC Santa Cruz Solar Collaborative wishes to provide up-to-date, detailed information on the science behind photovoltaics. The Solar to their respective section, thereby helping to create a hub for reliable information on solar technology. · Solar

  9. Increasing Community Access to Solar: Designing and Developing a Shared Solar Photovoltaic System (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2012-06-01T23:59:59.000Z

    This document introduces the Energy Department's new Guide to Community Shared Solar: Utility, Private, and Nonprofit Project Development. The guide is designed to help those who want to develop community shared solar projects - from community organizers and advocates to utility managers and government officials - navigate the process of developing shared systems, from early planning to implementation.

  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

    Storage of Solar Thermal Energy,” Solar Energy, 18 (3), pp.Nocera D. G. , 2010, “Solar Energy Supply and Storage forof Abiotic Photo-chemical Solar Energy Storage Systems,”

  11. 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

    to be more suited to solar thermal energy sources. Airunit of solar thermal and solar electric energy from a DCS-concentrating solar systems is indeed thermal energy. There

  12. Solar energy system demonstration project at Wilmington Swim School, New Castle, Delaware. Final report

    SciTech Connect (OSTI)

    None

    1980-07-01T23:59:59.000Z

    This document is the Final Report of the Solar Energy System located at the Wilmington, Swim School, New Castle, Delaware. This active solar system is composed of 2,700 square feet of Revere liquid flat plate collectors piped to a 2,800 gallon concrete storage tank located below ground near the building. A micro-computer based control system selects the optimal applications of the stored energy among space, domestic water and pool alternatives. The controlled logic is planned for serving the heat loads in the following order: space heat-new addition, domestic water-entire facility, and pool heating-entire facility. A modified trombe wall passive operation the active system will bypass the areas being served passively. The system was designed for a 40 percent heating and a 30 percent hot water solar contribution.

  13. Siemens Concentrated Solar Power Ltd previously Solel Solar Systems | Open

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro Industries Pvt LtdShawangunk, New York:SiG Solar GmbH Jump to: navigation, searchSidingEnergy

  14. Design and Analysis of Micro-Solar Power Systems for Wireless Sensor Networks

    E-Print Network [OSTI]

    Culler, David E.

    design guidelines for micro-solar power systems. Keywords-- Micro-Solar Power Systems, Solar Energy Har of the four components of a micro- solar power system models various design choices. Based on this modelDesign and Analysis of Micro-Solar Power Systems for Wireless Sensor Networks Jaein Jeong, Xiaofan

  15. Donaldson Active Regeneration PM System

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

    Modeling - FEA * Failure Mode Analysis & Life Prediction - Reliability Analysis * FMEA, Fault Tree Analysis, Risk Assessment, etc. Active System Durability & Reliability...

  16. Integrating Solar PV in Utility System Operations

    SciTech Connect (OSTI)

    Mills, A.; Botterud, A.; Wu, J.; Zhou, Z.; Hodge, B-M.; Heany, M.

    2013-10-31T23:59:59.000Z

    This study develops a systematic framework for estimating the increase in operating costs due to uncertainty and variability in renewable resources, uses the framework to quantify the integration costs associated with sub-hourly solar power variability and uncertainty, and shows how changes in system operations may affect these costs. Toward this end, we present a statistical method for estimating the required balancing reserves to maintain system reliability along with a model for commitment and dispatch of the portfolio of thermal and renewable resources at different stages of system operations. We estimate the costs of sub-hourly solar variability, short-term forecast errors, and day-ahead (DA) forecast errors as the difference in production costs between a case with “realistic” PV (i.e., subhourly solar variability and uncertainty are fully included in the modeling) and a case with “well behaved” PV (i.e., PV is assumed to have no sub-hourly variability and can be perfectly forecasted). In addition, we highlight current practices that allow utilities to compensate for the issues encountered at the sub-hourly time frame with increased levels of PV penetration. In this analysis we use the analytical framework to simulate utility operations with increasing deployment of PV in a case study of Arizona Public Service Company (APS), a utility in the southwestern United States. In our analysis, we focus on three processes that are important in understanding the management of PV variability and uncertainty in power system operations. First, we represent the decisions made the day before the operating day through a DA commitment model that relies on imperfect DA forecasts of load and wind as well as PV generation. Second, we represent the decisions made by schedulers in the operating day through hour-ahead (HA) scheduling. Peaking units can be committed or decommitted in the HA schedules and online units can be redispatched using forecasts that are improved relative to DA forecasts, but still imperfect. Finally, we represent decisions within the operating hour by schedulers and transmission system operators as real-time (RT) balancing. We simulate the DA and HA scheduling processes with a detailed unit-commitment (UC) and economic dispatch (ED) optimization model. This model creates a least-cost dispatch and commitment plan for the conventional generating units using forecasts and reserve requirements as inputs. We consider only the generation units and load of the utility in this analysis; we do not consider opportunities to trade power with neighboring utilities. We also do not consider provision of reserves from renewables or from demand-side options. We estimate dynamic reserve requirements in order to meet reliability requirements in the RT operations, considering the uncertainty and variability in load, solar PV, and wind resources. Balancing reserve requirements are based on the 2.5th and 97.5th percentile of 1-min deviations from the HA schedule in a previous year. We then simulate RT deployment of balancing reserves using a separate minute-by-minute simulation of deviations from the HA schedules in the operating year. In the simulations we assume that balancing reserves can be fully deployed in 10 min. The minute-by-minute deviations account for HA forecasting errors and the actual variability of the load, wind, and solar generation. Using these minute-by-minute deviations and deployment of balancing reserves, we evaluate the impact of PV on system reliability through the calculation of the standard reliability metric called Control Performance Standard 2 (CPS2). Broadly speaking, the CPS2 score measures the percentage of 10-min periods in which a balancing area is able to balance supply and demand within a specific threshold. Compliance with the North American Electric Reliability Corporation (NERC) reliability standards requires that the CPS2 score must exceed 90% (i.e., the balancing area must maintain adequate balance for 90% of the 10-min periods). The combination of representing DA forecast errors in the

  17. Solar Energy Program: Chapter from the Energy and Environmental Division Annual Report 1980

    E-Print Network [OSTI]

    Energy and Environment Division

    1981-01-01T23:59:59.000Z

    SOLAR ENERGY PROGRAM PERSONNEL Small Particle SuspensionsStrategies for Active Solar Energy Systems M. Warren, S.ENVIRONMENT DIVISION I SOLAR ENERGY PROGRAM Chapter from t h

  18. SOLAR ENERGY PROGRAM: CHAPTER FROM THE ENERGY AND ENVIRONMENT ANNUAL REPORT 1979

    E-Print Network [OSTI]

    Authors, Various

    2010-01-01T23:59:59.000Z

    Suspensions for Solar Energy Collection A. Hunt . . .Strategies for Active Solar Energy Systems M. Warren, S.Warren, and A. Heitz • Solar Energy Staff • . . INTRODUCTION

  19. Solar Energy Program: Chapter from the Energy and Environmental Division Annual Report 1980

    E-Print Network [OSTI]

    Energy and Environment Division

    1981-01-01T23:59:59.000Z

    SOLAR ENERGY PROGRAM PERSONNEL Small Particle SuspensionsStrategies for Active Solar Energy Systems M. Warren, S.M. Wahlig, and S Kanzler. SOLAR ENERGY PROGRAM PERSONNEL

  20. SOLAR ENERGY PROGRAM: CHAPTER FROM THE ENERGY AND ENVIRONMENT ANNUAL REPORT 1979

    E-Print Network [OSTI]

    Authors, Various

    2010-01-01T23:59:59.000Z

    Suspensions for Solar Energy Collection A. Hunt . . .Strategies for Active Solar Energy Systems M. Warren, S.ENVIRONMENT DIVISION SOLAR ENERGY PROGRAM CHAPTER FROM THE

  1. SOLAR ENERGY PROGRAM: CHAPTER FROM THE ENERGY AND ENVIRONMENT ANNUAL REPORT 1979

    E-Print Network [OSTI]

    Authors, Various

    2010-01-01T23:59:59.000Z

    Suspensions for Solar Energy Collection A. Hunt . . .Strategies for Active Solar Energy Systems M. Warren, S.Sandia Laboratories and Solar Energy Research Institute (

  2. Solar Energy Program: Chapter from the Energy and Environmental Division Annual Report 1980

    E-Print Network [OSTI]

    Energy and Environment Division

    1981-01-01T23:59:59.000Z

    SOLAR ENERGY PROGRAM PERSONNEL Small Particle SuspensionsStrategies for Active Solar Energy Systems M. Warren, S.tary for Conservation and Solar Energy, Office of Advanced

  3. Galileon forces in the Solar System

    E-Print Network [OSTI]

    Melinda Andrews; Yi-Zen Chu; Mark Trodden

    2013-10-14T23:59:59.000Z

    We consider the challenging problem of obtaining an analytic understanding of realistic astrophysical dynamics in the presence of a Vainshtein screened fifth force arising from infrared modifications of General Relativity. In particular, we attempt to solve -- within the most general flat spacetime galileon model -- the scalar force law between well separated bodies located well within the Vainshtein radius of the Sun. To this end, we derive the exact static Green's function of the galileon wave equation linearized about the background field generated by the Sun, for the minimal cubic and maximally quartic galileon theories, and then introduce a method to compute the general leading order force law perturbatively away from these limits. We also show that the same nonlinearities which produce the Vainshtein screening effect present obstacles to an analytic calculation of the galileon forces between closely bound systems within the solar system, such as that of the Earth and Moon. Within the test mass approximation, we deduce that a large enough quartic galileon interaction would suppress the effect on planetary perihelion precession below the level detectable by even the next-generation experiments.

  4. Implementations of electric vehicle system based on solar energy in Singapore assessment of solar thermal technologies

    E-Print Network [OSTI]

    Liu, Xiaogang, M. Eng. Massachusetts Institute of Technology

    2009-01-01T23:59:59.000Z

    To build an electric car plus renewable energy system for Singapore, solar thermal technologies were investigated in this report in the hope to find a suitable "green" energy source for this small island country. Among all ...

  5. July 17 ESTAP Webinar: Resilient Solar-Storage Systems for Homes...

    Energy Savers [EERE]

    July 17 ESTAP Webinar: Resilient Solar-Storage Systems for Homes and Commercial Facilities July 17 ESTAP Webinar: Resilient Solar-Storage Systems for Homes and Commercial...

  6. Design and global optimization of high-efficiency solar thermal systems with tungsten cermets

    E-Print Network [OSTI]

    Chester, David A.

    Solar thermal, thermoelectric, and thermophotovoltaic (TPV) systems have high maximum theoretical efficiencies; experimental systems fall short because of losses by selective solar absorbers and TPV selective emitters. To ...

  7. Sign singularity and flares in solar active region NOAA 11158

    E-Print Network [OSTI]

    Sorriso-Valvo, Luca; Kazachenko, Maria D; Krucker, Sam; Primavera, Leonardo; Servidio, Sergio; Vecchio, Antonio; Welsch, Brian T; Fisher, George H; Lepreti, Fabio; Carbone, Vincenzo

    2015-01-01T23:59:59.000Z

    Solar Active Region NOAA 11158 has hosted a number of strong flares, including one X2.2 event. The complexity of current density and current helicity are studied through cancellation analysis of their sign-singular measure, which features power-law scaling. Spectral analysis is also performed, revealing the presence of two separate scaling ranges with different spectral index. The time evolution of parameters is discussed. Sudden changes of the cancellation exponents at the time of large flares, and the presence of correlation with EUV and X-ray flux, suggest that eruption of large flares can be linked to the small scale properties of the current structures.

  8. active solar heating: Topics by E-print Network

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

    solar air collector PV-panel fannon-return valve DHW tank mantle cold waterhot water roof Solar Energy Centre Denmark Danish Technological Institute SEC-R-29 12;Solar air heating...

  9. ECE 414A/514A Photovoltaic Solar Energy Systems

    E-Print Network [OSTI]

    Arizona, University of

    ECE 414A/514A Photovoltaic Solar Energy Systems Instructor: Prof. Raymond K. Kostuk Time: MWF 04 kostuk@ece.arizona.edu Class webpage: ece.Arizona.edu/~ece414a Abstract: The solar illumination reaching the surface of the earth provides 41023 J/year and is about 104 the global annual energy consumption

  10. Interaction of a solar space heating system with the thermal behavior of a building

    SciTech Connect (OSTI)

    Vilmer, C.; Warren, M.L.; Auslander, D.

    1980-12-01T23:59:59.000Z

    The thermal behavior of a building in response to heat input from an active solar space heating system is analyzed to determine the effect of the variable storage tank temperature on the cycling rate, on-time, and off-time of a heating cycle and on the comfort characteristics of room air temperature swing and of offset of the average air temperature from the setpoint (droop). A simple model of a residential building, a fan coil heat-delivery system, and a bimetal thermostat are used to describe the system. A computer simulation of the system behavior has been developed and verified by comparisons with predictions from previous studies. The system model and simulation are then applied to determine the building response to a typical hydronic solar heating system for different solar storage temperatures, outdoor temperatures, and fan coil sizes. The simulations were run only for those cases where there was sufficient energy from storage to meet the building load requirements.

  11. active solar thermal: Topics by E-print Network

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

    Sunspot fine structure observed with Swedish Solar Telescope (SST) Sunspot 7 CALIFORNIA SOLAR INITIATIVE-THERMAL PROGRAMHANDBOOK Energy Storage, Conversion and Utilization...

  12. Interpreting Helioseismic Structure Inversion Results of Solar Active Regions

    E-Print Network [OSTI]

    Chia-Hsien Lin; Sarbani Basu; Linghuai Li

    2008-09-08T23:59:59.000Z

    Helioseismic techniques such as ring-diagram analysis have often been used to determine the subsurface structural differences between solar active and quiet regions. Results obtained by inverting the frequency differences between the regions are usually interpreted as the sound-speed differences between them. These in turn are used as a measure of temperature and magnetic-field strength differences between the two regions. In this paper we first show that the "sound-speed" difference obtained from inversions is actually a combination of sound-speed difference and a magnetic component. Hence, the inversion result is not directly related to the thermal structure. Next, using solar models that include magnetic fields, we develop a formulation to use the inversion results to infer the differences in the magnetic and thermal structures between active and quiet regions. We then apply our technique to existing structure inversion results for different pairs of active and quiet regions. We find that the effect of magnetic fields is strongest in a shallow region above 0.985R_sun and that the strengths of magnetic-field effects at the surface and in the deeper (r < 0.98R_sun) layers are inversely related, i.e., the stronger the surface magnetic field the smaller the magnetic effects in the deeper layers, and vice versa. We also find that the magnetic effects in the deeper layers are the strongest in the quiet regions, consistent with the fact that these are basically regions with weakest magnetic fields at the surface. Because the quiet regions were selected to precede or follow their companion active regions, the results could have implications about the evolution of magnetic fields under active regions.

  13. Water delivery in the Early Solar System

    E-Print Network [OSTI]

    Dvorak, Rudolf; Süli, Áron; Sándor, Zsolt; Galiazzo, Mattia; Pilat-Lohinger, Elke

    2015-01-01T23:59:59.000Z

    As part of the national scientific network 'Pathways to Habitable Worlds' the delivery of water onto terrestrial planets is a key question since water is essential for the development of life as we know it. After summarizing the state of the art we show some first results of the transport of water in the early Solar System for scattered main belt objects. Hereby we investigate the questions whether planetesimals and planetesimal fragments which have gained considerable inclination due to the strong dynamical interactions in the main belt region around 2 AU can be efficient water transporting vessels. The Hungaria asteroid group is the best example that such scenarios are realistic. Assuming that the gas giants and the terrestrial planets are already formed, we monitor the collisions of scattered small bodies containing water (in the order of a few percent) with the terrestrial planets. Thus we are able to give a first estimate concerning the respective contribution of such bodies to the actual water content i...

  14. Design and Analysis of Hybrid Solar Lighting and Full-Spectrum Solar Energy Systems

    SciTech Connect (OSTI)

    Muhs, J.D.

    2001-06-19T23:59:59.000Z

    This paper describes a systems-level design and analysis of a new approach for improving the energy efficiency and affordability of solar energy in buildings, namely, hybrid solar lighting and full-spectrum solar energy systems. By using different portions of the solar spectrum simultaneously for multiple end-use applications in buildings, the proposed system offers unique advantages over other alternatives for using sunlight to displace electricity (conventional topside daylighting and solar technologies). Our preliminary work indicates that hybrid solar lighting, a method of collecting and distributing direct sunlight for lighting purposes, will alleviate many of the problems with passive daylighting systems of today, such as spatial and temporal variability, glare, excess illumination, cost, and energy efficiency. Similarly, our work suggests that the most appropriate use of the visible portion of direct, nondiffuse sunlight from an energy-savings perspective is to displace electric light rather than generate electricity. Early estimates detailed in this paper suggest an anticipated system cost of well under $2.0/Wp and 5-11 {cents}/kWh for displaced and generated electricity in single-story commercial building applications. Based on a number of factors discussed in the paper, including sunlight availability, building use scenarios, time-of-day electric utility rates, cost, and efficacy of the displaced electric lights, the simple payback of this approach in many applications could eventually be well under 5 years.

  15. The Added Economic and Environmental Value of Solar Thermal Systems in Microgrids with Combined Heat and Power

    E-Print Network [OSTI]

    Marnay, Chris

    2010-01-01T23:59:59.000Z

    Environmental Value of Solar Thermal Systems in MicrogridsEnvironmental Value of Solar Thermal Systems in Microgridsa) ABSTRACT The addition of solar thermal and heat storage

  16. Solar Systems sro | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit with form HistoryRistmaSinosteelSolar Energy sro JumpProjects ServicesSolarSolar

  17. THE TEMPERATURE DEPENDENCE OF SOLAR ACTIVE REGION OUTFLOWS

    SciTech Connect (OSTI)

    Warren, Harry P.; Ugarte-Urra, Ignacio; Young, Peter R.; Stenborg, Guillermo [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)

    2011-01-20T23:59:59.000Z

    Spectroscopic observations with the EUV Imaging Spectrometer (EIS) on Hinode have revealed large areas of high-speed outflows at the periphery of many solar active regions. These outflows are of interest because they may connect to the heliosphere and contribute to the solar wind. In this paper, we use slit rasters from EIS in combination with narrowband slot imaging to study the temperature dependence and morphology of an outflow region and show that it is more complicated than previously thought. Outflows are observed primarily in emission lines from Fe XI to Fe XV. Observations at lower temperatures (Si VII), in contrast, show bright fan-like structures that are dominated by inflows. These data also indicate that the morphology of the outflows and the fans is different, outflows are observed in regions where there is no emission in Si VII. This suggests that the fans, which are often associated with outflows in studies involving imaging data, are not directly related to the active region outflows.

  18. Reconstructing Past Solar Activity using Meridian Solar Observations: the Case of the Royal Observatory of the Spanish Navy (1833-1840)

    E-Print Network [OSTI]

    Vaquero, J M

    2014-01-01T23:59:59.000Z

    Solar meridian observations have been used to evaluate the solar activity of the past. Some important examples are the solar meridian observations made at the Basilica of San Petronio in Bologna by several astronomers and the observations made by Hevelius published in his book Machina Coelestis. However, we do not know whether these observations, which were not aimed to estimate the solar activity, are reliable for evaluating solar activity. In this paper, we present the marginal notes about sunspots that are included in the manuscripts of the meridian solar observations made at the Royal Observatory of the Spanish Navy during the period 1833-1840. We compare these observations with other solar activity indices such as sunspot area and number. Our conclusion is that solar meridian observations should be used with extreme caution to evaluate past solar activity.

  19. Radiation Belt Activity Indices and Solar Proton Event Alarm on the CRATERRE Project Web Site

    E-Print Network [OSTI]

    Radiation Belt Activity Indices and Solar Proton Event Alarm on the CRATERRE Project Web Site D--Two Radiation Belt Activity Indices, based on electron flux measurement >300 keV and >1.6 MeV, and one Solar updated. Index Terms- CRATERRE project, Radiation belts activity, Space environment I. INTRODUCTION

  20. Heat Pipe Solar Receiver Development Activities at Sandia National Laboratories

    SciTech Connect (OSTI)

    Adkins, D.R.; Andraka, C.E.; Moreno, J.B.; Moss, T.A.; Rawlinson, K.S.; Showalter, S.K.

    1999-01-08T23:59:59.000Z

    Over the past decade, Sandia National Laboratories has been involved in the development of receivers to transfer energy from the focus of a parabolic dish concentrator to the heater tubes of a Stirling engine. Through the isothermal evaporation and condensation of sodium. a heat-pipe receiver can efficiently transfer energy to an engine's working fluid and compensate for irregularities in the flux distribution that is delivered by the concentrator. The operation of the heat pipe is completely passive because the liquid sodium is distributed over the solar-heated surface by capillary pumping provided by a wick structure. Tests have shown that using a heat pipe can boost the system performance by twenty percent when compared to directly illuminating the engine heater tubes. Designing heat pipe solar receivers has presented several challenges. The relatively large area ({approximately}0.2 m{sup 2}) of the receiver surface makes it difficult to design a wick that can continuously provide liquid sodium to all regions of the heated surface. Selecting a wick structure with smaller pores will improve capillary pumping capabilities of the wick, but the small pores will restrict the flow of liquid and generate high pressure drops. Selecting a wick that is comprised of very tine filaments can increase the permeability of the wick and thereby reduce flow losses, however, the fine wick structure is more susceptible to corrosion and mechanical damage. This paper provides a comprehensive review of the issues encountered in the design of heat pipe solar receivers and solutions to problems that have arisen. Topics include: flow characterization in the receiver, the design of wick systems. the minimization of corrosion and dissolution of metals in sodium systems. and the prevention of mechanical failure in high porosity wick structures.

  1. Solar Design Workbook

    SciTech Connect (OSTI)

    Franta, G.; Baylin, F.; Crowther, R.; Dubin, F.; Grace, A., Griffith, J.W.; Holtz, M.; Kutscher, C.; Nordham, D.; Selkowitz, S.; Villecco, M.

    1981-06-01T23:59:59.000Z

    This Solar Design Workbook presents solar building design applications for commercial buildir^s. The book is divided into four sections. The first section describes the variety of solar applications in buildings including conservation aspects, solar fundamentals, passive systems, active systems, daylighting, and other solar options. Solar system design evaluation techniques including considerations for building energy requirements, passive systems, active systems, and economics are presented in Section II. The third section attempts to assist the designer in the building design process for energy conservation and solar applications including options and considerations for pre-design, design, and post-design phases. The information required for the solar design proee^ has not been fully developed at this time. Therefore, Section III is incomplete, but an overview of the considerations with some of the design proces elements is presented. Section IV illustrates ease studies that utilize solar applications in the building design.

  2. Subsurface and Atmospheric Influences on Solar Activity ASP Conference Series, Vol. 383, c 2008

    E-Print Network [OSTI]

    Lin, Yong

    hemisphere with the Swedish 1-m Solar Telescope on 26 August 2003. The upper panel shows the filament spineSubsurface and Atmospheric Influences on Solar Activity ASP Conference Series, Vol. 383, c 2008 R and their Interrelation Y. Lin,1 S. F. Martin,2 and O. Engvold1 Abstract. The main structural components of solar

  3. UHF Solar Powered Active Oscillator Antenna on Low Cost Flexible Substrate for Wireless Identification Applications

    E-Print Network [OSTI]

    Tentzeris, Manos

    UHF Solar Powered Active Oscillator Antenna on Low Cost Flexible Substrate for Wireless nature of the circuit and providing operational autonomy by harvesting solar power without affecting, solar power harvesting. I. INTRODUCTION The increasing use of RFIDs and wireless sensor networks

  4. Energetic outer radiation-belt electron precipitation during recurrent solar activity

    E-Print Network [OSTI]

    Otago, University of

    on the atmosphere [Seppälä et al., 2004]. During some intense solar storms solar protons in the energy range 1Energetic outer radiation-belt electron precipitation during recurrent solar activity Mark A and Physical Sciences, University of Newcastle, Callaghan, Australia. Russell S. Grew School of Mathematical

  5. Particle acceleration and radiation by direct electric fields in flaring complex solar active regions

    E-Print Network [OSTI]

    Anastasiadis, Anastasios

    Particle acceleration and radiation by direct electric fields in flaring complex solar active-Meudon, 92195 Meudon Cedex, FRANCE Abstract The acceleration and radiation of solar energetic particles with the existing observations. 1 Introduction The approach used for particle acceleration models proposed for solar

  6. Demo: Organic Solar Cell-equipped Energy Harvesting Active Networked Tag (EnHANT) Prototypes

    E-Print Network [OSTI]

    Carloni, Luca

    Demo: Organic Solar Cell-equipped Energy Harvesting Active Networked Tag (EnHANT) Prototypes Gerald harvesting and communications hardware, namely organic solar cells and ultra-wide-band impulse radio (UWB harvesting, organic solar cells, ultra-low-power com- munications, ultra-wideband impulse radio, energy

  7. Embedding metal electrodes in thick active layers for ITO-free plasmonic organic solar cells

    E-Print Network [OSTI]

    Park, Namkyoo

    Embedding metal electrodes in thick active layers for ITO-free plasmonic organic solar cells%) in optical absorption over both a conventional ITO organic solar cell and a conventional plasmonic organic solar cell with top-loaded metallic grating is predicted in the proposed structure. Optimal positioning

  8. Corotating solar wind streams and recurrent geomagnetic activity: Bruce T. Tsurutani,1,2

    E-Print Network [OSTI]

    Bergen, Universitetet i

    ´n waves is the solar wind energy transfer mechanism. The acceleration of relativistic electrons occurs Laboratory, Oxfordshire, UK. 6 Solar-Terrestrial Environment Laboratory, Nagoya University, Toyo- kawa, JapanCorotating solar wind streams and recurrent geomagnetic activity: A review Bruce T. Tsurutani,1

  9. Impact of SolarSmart Subdivisions on SMUD's Distribution System

    SciTech Connect (OSTI)

    McNutt, P.; Hambrick, J.; Keesee, M.; Brown, D.

    2009-07-01T23:59:59.000Z

    This study analyzes the distribution impacts of high penetrations of grid-integrated renewable energy systems, specifically photovoltaic (PV) equipped SolarSmart Homes found in the Anatolia III Residential Community.

  10. Local Option- Solar, Wind and Biomass Energy Systems Exemption

    Broader source: Energy.gov [DOE]

    Section 487 of the New York State Real Property Tax Law provides a 15-year real property tax exemption for solar, wind energy, and farm-waste energy systems constructed in New York State. As...

  11. Expedited Permitting Process for Solar Photovoltaic Systems (Vermont)

    Broader source: Energy.gov [DOE]

    Vermont has established an expedited permitting process for solar photovoltaic systems that are 10 kilowatts-AC (kW) or less. In order to interconnect and net meter, electric customers in Vermont...

  12. City of Tucson- Permit Fee Credit for Solar Energy Systems

    Broader source: Energy.gov [DOE]

    The City of Tucson passed Resolution No. 20193 on September 27, 2005, to encourage the installation of solar energy systems throughout the city. The resolution established a policy whereby the...

  13. Solar system constraints on f(G) gravity models

    E-Print Network [OSTI]

    Antonio De Felice; Shinji Tsujikawa

    2009-07-10T23:59:59.000Z

    We discuss solar system constraints on f(G) gravity models, where f is a function of the Gauss-Bonnet term G. We focus on cosmologically viable f(G) models that can be responsible for late-time cosmic acceleration. These models generally give rise to corrections of the form epsilon*(r/rs)^p to the vacuum Schwarzschild solution, where epsilon = H^2 rs^2 solar system constraints for a wide range of model parameters.

  14. Reliability analysis of solar photovoltaic system using hourly mean solar radiation data

    SciTech Connect (OSTI)

    Moharil, Ravindra M. [Department of Electrical Engineering, Yeshwantrao Chavan College of Engineering, Nagpur, Maharashtra (India); Kulkarni, Prakash S. [Department of Electrical Engineering, Visvesvaraya National Institute of Technology, South Ambazari Road, Nagpur 440011, Maharashtra (India)

    2010-04-15T23:59:59.000Z

    This paper presents the hourly mean solar radiation and standard deviation as inputs to simulate the solar radiation over a year. Monte Carlo simulation (MCS) technique is applied and MATLAB program is developed for reliability analysis of small isolated power system using solar photovoltaic (SPV). This paper is distributed in two parts. Firstly various solar radiation prediction methods along with hourly mean solar radiation (HMSR) method are compared. The comparison is carried on the basis of predicted electrical power generation with actual power generated by SPV system. Estimation of solar photovoltaic power using HMSR method is close to the actual power generated by SPV system. The deviation in monsoon months is due to the cloud cover. In later part of the paper various reliability indices are obtained by HMSR method using MCS technique. Load model used is IEEE-RTS. Reliability indices, additional load hours (ALH) and additional power (AP) reduces exponentially with increase in load indicates that a SPV source will offset maximum fuel when all of its generated energy is utilized. Fuel saving calculation is also investigated. Case studies are presented for Sagardeep Island in West Bengal state of India. (author)

  15. Solar Deployment System (SolarDS) Model: Documentation and Sample Results

    SciTech Connect (OSTI)

    Denholm, P.; Drury, E.; Margolis, R.

    2009-09-01T23:59:59.000Z

    The Solar Deployment System (SolarDS) model is a bottom-up, market penetration model that simulates the potential adoption of photovoltaics (PV) on residential and commercial rooftops in the continental United States through 2030. NREL developed SolarDS to examine the market competitiveness of PV based on regional solar resources, capital costs, electricity prices, utility rate structures, and federal and local incentives. The model uses the projected financial performance of PV systems to simulate PV adoption for building types and regions then aggregates adoption to state and national levels. The main components of SolarDS include a PV performance simulator, a PV annual revenue calculator, a PV financial performance calculator, a PV market share calculator, and a regional aggregator. The model simulates a variety of installed PV capacity for a range of user-specified input parameters. PV market penetration levels from 15 to 193 GW by 2030 were simulated in preliminary model runs. SolarDS results are primarily driven by three model assumptions: (1) future PV cost reductions, (2) the maximum PV market share assumed for systems with given financial performance, and (3) PV financing parameters and policy-driven assumptions, such as the possible future cost of carbon emissions.

  16. Optimized scalable stack of fluorescent solar concentrator systems with bifacial silicon solar cells

    SciTech Connect (OSTI)

    Martínez Díez, Ana Luisa, E-mail: a.martinez@itma.es [Fundación ITMA, Parque Empresarial Principado de Asturias, C/Calafates, Parcela L-3.4, 33417 Avilés (Spain); Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg (Germany); Gutmann, Johannes; Posdziech, Janina; Rist, Tim; Goldschmidt, Jan Christoph [Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg (Germany); Plaza, David Gómez [Fundación ITMA, Parque Empresarial Principado de Asturias, C/Calafates, Parcela L-3.4, 33417 Avilés (Spain)

    2014-10-21T23:59:59.000Z

    In this paper, we present a concentrator system based on a stack of fluorescent concentrators (FCs) and a bifacial solar cell. Coupling bifacial solar cells to a stack of FCs increases the performance of the system and preserves its efficiency when scaled. We used an approach to optimize a fluorescent solar concentrator system design based on a stack of multiple fluorescent concentrators (FC). Seven individual fluorescent collectors (20 mm×20 mm×2 mm) were realized by in-situ polymerization and optically characterized in regard to their ability to guide light to the edges. Then, an optimization procedure based on the experimental data of the individual FCs was carried out to determine the stack configuration that maximizes the total number of photons leaving edges. Finally, two fluorescent concentrator systems were realized by attaching bifacial silicon solar cells to the optimized FC stacks: a conventional system, where FC were attached to one side of the solar cell as a reference, and the proposed bifacial configuration. It was found that for the same overall FC area, the bifacial configuration increases the short-circuit current by a factor of 2.2, which is also in agreement with theoretical considerations.

  17. 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.

  18. 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.

  19. SIMULATION OF THE FORMATION OF A SOLAR ACTIVE REGION

    SciTech Connect (OSTI)

    Cheung, M. C. M.; Title, A. M. [Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA 94304 (United States); Rempel, M. [High Altitude Observatory, NCAR, P.O. Box 3000, Boulder, CO 80307 (United States); Schuessler, M. [Max Planck Institute for Solar System Research, Katlenburg-Lindau, 37191 (Germany)

    2010-09-01T23:59:59.000Z

    We present a radiative magnetohydrodynamics simulation of the formation of an active region (AR) on the solar surface. The simulation models the rise of a buoyant magnetic flux bundle from a depth of 7.5 Mm in the convection zone up into the solar photosphere. The rise of the magnetic plasma in the convection zone is accompanied by predominantly horizontal expansion. Such an expansion leads to a scaling relation between the plasma density and the magnetic field strength such that B {proportional_to} rhov{sup 1/2}. The emergence of magnetic flux into the photosphere appears as a complex magnetic pattern, which results from the interaction of the rising magnetic field with the turbulent convective flows. Small-scale magnetic elements at the surface first appear, followed by their gradual coalescence into larger magnetic concentrations, which eventually results in the formation of a pair of opposite polarity spots. Although the mean flow pattern in the vicinity of the developing spots is directed radially outward, correlations between the magnetic field and velocity field fluctuations allow the spots to accumulate flux. Such correlations result from the Lorentz-force-driven, counterstreaming motion of opposite polarity fragments. The formation of the simulated AR is accompanied by transient light bridges between umbrae and umbral dots. Together with recent sunspot modeling, this work highlights the common magnetoconvective origin of umbral dots, light bridges, and penumbral filaments.

  20. The origin of net electric currents in solar active regions

    E-Print Network [OSTI]

    Dalmasse, K; Démoulin, P; Kliem, B; Török, T; Pariat, E

    2015-01-01T23:59:59.000Z

    There is a recurring question in solar physics about whether or not electric currents are neutralized in active regions (ARs). This question was recently revisited using three-dimensional (3D) magnetohydrodynamic (MHD) numerical simulations of magnetic flux emergence into the solar atmosphere. Such simulations showed that flux emergence can generate a substantial net current in ARs. Another source of AR currents are photospheric horizontal flows. Our aim is to determine the conditions for the occurrence of net vs. neutralized currents with this second mechanism. Using 3D MHD simulations, we systematically impose line-tied, quasi-static, photospheric twisting and shearing motions to a bipolar potential magnetic field. We find that such flows: (1) produce both {\\it direct} and {\\it return} currents, (2) induce very weak compression currents - not observed in 2.5D - in the ambient field present in the close vicinity of the current-carrying field, and (3) can generate force-free magnetic fields with a net current...

  1. Solar Systems Pty Ltd | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit with form HistoryRistmaSinosteelSolar Energy sro JumpProjects ServicesSolar

  2. Developing, testing, evaluating and optimizing solar heating and cooling systems

    SciTech Connect (OSTI)

    Not Available

    1991-11-01T23:59:59.000Z

    The objective is to develop and test various integrated solar heating, cooling and domestic hot water systems, and to evaluate their performance. Systems composed of new, as well a previously tested, components are carefully integrated so that effects of new components on system performance can be clearly delineated. The SEAL-DOE program includes six tasks which have received funding for the 1991--1992 fifteen-month period. These include: (1) a project employing isothermal operation of air and liquid solar space hearing systems, (2) a project to build and test several generic solar water heaters, (3) a project that will evaluate advanced solar domestic hot water components and concepts and integrate them into solar domestic hot water systems, (4) a liquid desiccant cooling system development project, (5) a project that will perform system modeling and analysis work on solid desiccant cooling systems research, and (6) a management task. The objectives and progress in each task are described in this report. 6 figs., 2 tabs.

  3. Solar passive ceiling system. Final report. [Passive solar heating system with venetian blind reflectors and latent heat storage in ceiling

    SciTech Connect (OSTI)

    Schneider, A.R.

    1980-01-01T23:59:59.000Z

    The construction of a 1200 square foot building, with full basement, built to be used as a branch library in a rural area is described. The primary heating source is a passive solar system consisting of a south facing window system. The system consists of: a set of windows located in the south facing wall only, composed of double glazed units; a set of reflectors mounted in each window which reflects sunlight up to the ceiling (the reflectors are similar to venetian blinds); a storage area in the ceiling which absorbs the heat from the reflected sunlight and stores it in foil salt pouches laid in the ceiling; and an automated curtain which automatically covers and uncovers the south facing window system. The system is totally passive and uses no blowers, pumps or other active types of heat distribution equipment. The building contains a basement which is normally not heated, and the north facing wall is bermed four feet high around the north side.

  4. Solar/performance goals for solar and ground-coupled heat pump systems

    SciTech Connect (OSTI)

    Andrews, J.W.

    1980-09-01T23:59:59.000Z

    Cost goals for combined solar/heat pump systems are developed. Three methods of analysis are used: simple payback, positive cash flow, and life cycle costing. The goals are parameterized on system energy efficiency, with the air-to-air heat pump as the conventional system which is used as a basis for comparison. Cost goals for nine systems are determined in three generic climates.

  5. 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.

  6. Solar activity can be surprisingly good for Last month, the sun went haywire. Almost every day for two weeks in early September, solar flares

    E-Print Network [OSTI]

    California at Santa Cruz, University of

    Solar activity can be surprisingly good for astronauts Last month, the sun went haywire. Almost every day for two weeks in early September, solar flares issued from a giant sunspot named "active region 798/808." X-rays ionized Earth's upper atmosphere. Solar protons peppered the Moon

  7. Innovative gas energy systems for use with passive solar residences

    SciTech Connect (OSTI)

    Hartman, D.; Kosar, D.

    1983-06-01T23:59:59.000Z

    The GRI asked Booz, Allen, and Hamilton to analyze the integration of passive solar with gas-fired energy systems for heating and cooling homes. Direct gain, trombe wall, thermosiphon and thermal roof storage heating systems were studied. Solar load control, evaporative cooling, earth coupling, and night radiation cooling systems were investigated. The drawbacks of conventional gas backup systems are discussed. Innovative passive/gas combinations are recommended. These include multizone gas furnace, decentralized gas space heater, gas desiccant dehumidifier, and gas dehumidifier for basement drying. The multizone furnace saves $1500, and is recommended for Pilot Version development.

  8. Subsurface and Atmospheric Influences on Solar Activity ASP Conference Series, Vol. 383, c 2008

    E-Print Network [OSTI]

    California at Berkeley, University of

    Subsurface and Atmospheric Influences on Solar Activity ASP Conference Series, Vol. 383, c 2008 R descriptions of the ambient coronal magnetic field struc- ture and the associated solar wind streams thanks twist, cur- rent sheets, and other unstable or energized configurations in the active region vicinity. 1

  9. Solar wind and geomagnetism: toward a standard classification of geomagnetic activity from 1868 to 2009

    E-Print Network [OSTI]

    Zerbo, J. L.

    We examined solar activity with a large series of geomagnetic data from 1868 to 2009. We have revisited the geomagnetic activity classification scheme of Legrand and Simon (1989) and improve their scheme by lowering the ...

  10. Techniques for Maximizing Efficiency of Solar Energy Harvesting Systems (Invited Paper)

    E-Print Network [OSTI]

    Shinozuka, Masanobu

    Techniques for Maximizing Efficiency of Solar Energy Harvesting Systems (Invited Paper) Pai H requiring battery replacement. This paper ex- amines technical issues with solar energy harvesting. First power point tracking, energy harvest- ing, solar panel, photovoltaic cell, supercapacitor, ultracapac

  11. Analysis of the Potential Applications of Solar Termal and Photovoltaic Systems for Northwest Vista College

    E-Print Network [OSTI]

    Ugursal, A.; Martinez, J.; Baltazar, J. C.; Zilbershtein, G.

    2013-01-01T23:59:59.000Z

    the following RE technologies as viable: ground source heat pump (GSHP) systems, closed loop solar thermal system and photovoltaic (PV)....

  12. Analysis of the Potential Applications of Solar Termal and Photovoltaic Systems for Northwest Vista College 

    E-Print Network [OSTI]

    Ugursal, A.; Martinez, J.; Baltazar, J. C.; Zilbershtein, G.

    2013-01-01T23:59:59.000Z

    the following RE technologies as viable: ground source heat pump (GSHP) systems, closed loop solar thermal system and photovoltaic (PV)....

  13. 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

    Concentrating Solar Combined Heat and Power Systemcombined heat and power systems . . . . . . . Verificationmyth eight – worldwide power systems are economically and

  14. Review of activities and plans for solar energy in Federal buildings

    SciTech Connect (OSTI)

    Not Available

    1980-10-01T23:59:59.000Z

    The purpose of this report is to provide the Department of Energy's Solar Federal Buildings Program with data on the Federal agencies' activities and plans regarding the use of solar energy in their buildings, and consequently, to make recommendations concerning the Solar Federal Buildings Program's plans. Specifically this report encompasses an analysis of agencies Ten Year Buildings construction, leasing and retrofit plans to provide visibility for and detailed knowledge of Federal agencies planning regarding solar and other renewable energy resources. The results of the analysis conducted, pertinent statistical information regarding planned solar projects, and recommendations concerning the SFBP plans are presented.

  15. Application of RIMS to the Study of Beryllium ChronologyApplication of RIMS to the Study of Beryllium Chronology in Early Solar System Condensatesin Early Solar System Condensates

    E-Print Network [OSTI]

    Grossman, Lawrence

    Application of RIMS to the Study of Beryllium ChronologyApplication of RIMS to the Study of Beryllium Chronology in Early Solar System Condensatesin Early Solar System Condensates K. B. Knight1, Beryllium and Boron in the Early Solar System Many unanswered questions remain concerning the timing

  16. A new method to estimate annual solar wind parameters and contributions of different solar wind structures to geomagnetic activity

    E-Print Network [OSTI]

    Holappa, Lauri; Asikainen, Timo

    2015-01-01T23:59:59.000Z

    In this paper, we study two sets of local geomagnetic indices from 26 stations using the principal component (PC) and the independent component (IC) analysis methods. We demonstrate that the annually averaged indices can be accurately represented as linear combinations of two first components with weights systematically depending on latitude. We show that the annual contributions of coronal mass ejections (CMEs) and high speed streams (HSSs) to geomagnetic activity are highly correlated with the first and second IC. The first and second ICs are also found to be very highly correlated with the strength of the interplanetary magnetic field (IMF) and the solar wind speed, respectively, because solar wind speed is the most important parameter driving geomagnetic activity during HSSs while IMF strength dominates during CMEs. These results help in better understanding the long-term driving of geomagnetic activity and in gaining information about the long-term evolution of solar wind parameters and the different sol...

  17. Design and Cost of Solar Photocatalytic Systems for Groundwater Remediation

    SciTech Connect (OSTI)

    Turchi, C. S.; Mehos, M. S.; Link, H. F.

    1992-05-01T23:59:59.000Z

    Laboratory and small-scale field experiments have shown that sunlight in conjunction with a simple catalyst can be used to detoxify water contaminated with a variety of hazardous chemicals. This study builds on previous analyses and recent field test data to predict the cost and performance of a representative commercial water detoxification system. Three different solar operating configurations are explored for the treatment of 100,000 gal/day of groundwater contaminated with trichloroethylene. Current costs for solar water detoxification systems are projected to be comparable to those for conventional treatment technologies such as carbon adsorption and electric lamp-powered, ultraviolet light/hydrogen peroxide systems.

  18. SOLAR RADIATION DURABILITY OF MATERIALS, COMPONENTS AND SYSTEMS FOR PHOTOVOLTAICS

    E-Print Network [OSTI]

    Rollins, Andrew M.

    SOLAR RADIATION DURABILITY OF MATERIALS, COMPONENTS AND SYSTEMS FOR PHOTOVOLTAICS Myles P. Murray 1 exposed photovoltaic materials, is defined as the rate of photodarkening or photobleaching of a material testing. The potential to predict power losses in a photovoltaic system over time caused

  19. Performance contracting for parabolic trough solar thermal systems

    SciTech Connect (OSTI)

    Brown, H.; Hewett, R.; Walker, A. [National Renewable Energy Lab., Golden, CO (United States); Gee, R.; May, K. [Industrial Solar Technology, Golden, CO (United States)

    1997-12-31T23:59:59.000Z

    Several applications of solar energy have proven viable in the energy marketplace, due to competitive technology and economic performance. One example is the parabolic trough solar collectors, which use focused solar energy to maximize efficiency and reduce material use in construction. Technical improvements are complemented by new business practices to make parabolic trough solar thermal systems technically and economically viable in an ever widening range of applications. Technical developments in materials and fabrication techniques reduce production cost and expand applications from swimming pool heating and service hot water, to higher-temperature applications such as absorption cooling and process steam. Simultaneously, new financing mechanisms such as a recently awarded US Department of Energy (DOE) Federal Energy Management Program (FEMP) indefinite quantity Energy Savings Performance Contract (Super ESPC) facilitate and streamline implementation of the technology in federal facilities such as prisons and military bases.

  20. Solar System Processes Underlying Planetary Formation, Geodynamics, and the Georeactor

    E-Print Network [OSTI]

    J. Marvin Herndon

    2007-01-02T23:59:59.000Z

    Only three processes, operant during the formation of the Solar System, are responsible for the diversity of matter in the Solar System and are directly responsible for planetary internal-structures, including planetocentric nuclear fission reactors, and for dynamical processes, including and especially, geodynamics. These processes are: (i) Low-pressure, low-temperature condensation from solar matter in the remote reaches of the Solar System or in the interstellar medium; (ii) High-pressure, high-temperature condensation from solar matter associated with planetary-formation by raining out from the interiors of giant-gaseous protoplanets, and; (iii) Stripping of the primordial volatile components from the inner portion of the Solar System by super-intense solar wind associated with T-Tauri phase mass-ejections, presumably during the thermonuclear ignition of the Sun. As described herein, these processes lead logically, in a causally related manner, to a coherent vision of planetary formation with profound implications including, but not limited to, (a) Earth formation as a giant gaseous Jupiter-like planet with vast amounts of stored energy of protoplanetary compression in its rock-plus-alloy kernel; (b) Removal of approximately 300 Earth-masses of primordial gases from the Earth, which began Earth's decompression process, making available the stored energy of protoplanetary compression for driving geodynamic processes, which I have described by the new whole-Earth decompression dynamics and which is responsible for emplacing heat at the mantle-crust-interface at the base of the crust through the process I have described, called mantle decompression thermal-tsunami; and, (c)Uranium accumulations at the planetary centers capable of self-sustained nuclear fission chain reactions.

  1. Homeowners Guide to Financing a Grid-Connected Solar Electric System (Brochure), Solar Energy Technologies Program (SETP)

    Broader source: Energy.gov [DOE]

    This guide provides an overview of the financing options that may be available to homeowners who are considering installing a solar electric system on their house.

  2. ATS Solar System | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:Ezfeedflag JumpID-fTriWildcat 1AMEE Jump to: navigation, search40 -Solar GmbHASP AGATATG

  3. Studying the Solar System's Chemical Recipe

    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 Our InstagramStructure of All-Polymer. . ~0s ALAMOSStudying the Solar

  4. Studying the Solar System's Chemical Recipe

    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 Our InstagramStructure of All-Polymer. . ~0s ALAMOSStudying the SolarStudying the

  5. Studying the Solar System's Chemical Recipe

    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 Our InstagramStructure of All-Polymer. . ~0s ALAMOSStudying the SolarStudying

  6. Environmental Solar Systems | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual Siteof Energy 2,AUDIT REPORTEnergy OffshoreDeveloperEnertech JumpEnvironmental Solar

  7. Solar Roofing Systems Inc | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit with form HistoryRistmaSinosteelSolar Energy sro JumpProjects Services Jump

  8. Vaillant Solar Systems | Open Energy Information

    Open Energy Info (EERE)

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro IndustriesTown of Ladoga,planning methodologies andVacant Jump to: navigation,Vaillant Solar

  9. Studying the Solar System's Chemical Recipe

    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 Office of ScienceandMesa del SolStrengthening a solid ... StrengtheningLab (NewportStudying the Solar

  10. 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

    solar CHP system supplying arbitrary heat and power outputs.e Electrical power output of system Q Solar CHP to PV yearlysolar Rankine CHP system, sized equally in terms of peak power output,

  11. Designing of Hybrid Power Generation System using Wind energy- Photovoltaic Solar energy- Solar energy with Nanoantenna

    E-Print Network [OSTI]

    All the natural wastage energies are used for production of Electricity. Thus, the Electrical Power or Electricity is available with a minimum cost and pollution free to anywhere in the world at all times. This process reveals a unique step in electricity generation and availability from natural resources without hampering the ecological balance. This paper describes a new and evolving Electrical Power Generation System by integrating simultaneously photovoltaic Solar Energy, solar Energy with Nano-antenna, Wind Energy and non conventional energy sources. We can have an uninterrupted power supply irrespective of the natural condition without any sort of environmental pollution. Moreover this process yields the least production cost for electricity generation. Utilization of lightning energy for generation of electricity reveals a new step. The set-up consists of combination of photo-voltaic solar-cell array & Nano-anteena array, a mast mounted wind generator, lead-acid storage batteries, an inverter unit to convert DC power to AC power, electrical lighting loads and electrical heating loads, several fuse and junction boxes and associated wiring, and test instruments for measuring voltages, currents, power factors, and harmonic contamination data throughout the system. This hybrid solar-wind power generating system will extensively use in the Industries and also in external use like home appliance.

  12. Do Solar system tests permit higher dimensional general relativity?

    E-Print Network [OSTI]

    F. Rahaman; Saibal Ray; M. Kalam; M. Sarker

    2007-07-07T23:59:59.000Z

    We perform a survey whether higher dimensional Schwarzschild space-time is compatible with some of the solar system phenomena. As a test we examine five well known solar system effects, viz., (1) Perihelion shift, (2) Bending of light, (3) Gravitational redshift, (4) Gravitational time delay and (5) Motion of test particle in the framework of general relativity with higher dimensions. It is shown that the results related to all these physical phenomena are mostly incompatible with the higher dimensional version of general relativity except that of Motion of test particle. We compare all these results with the available data in the literature.

  13. UNCORRECTEDPROOF 2 A method to evaluate the level of solar activity at

    E-Print Network [OSTI]

    UNCORRECTEDPROOF 2 A method to evaluate the level of solar activity at 3 the remainder of a progressing solar cycle 4 K.J. Li a,b,*, J. Qiu b , F.Y. Xiang c , P.X. Gao a , T.W. Su a 5 a Solar Physics Division, National Astronomical Observatories/Yunnan Observatory, CAS, Kunming 650011, China 6 b Big Bear

  14. Magnetic helicity and energy spectra of a solar active region

    E-Print Network [OSTI]

    Zhang, Hongqi; Sokoloff, D D

    2013-01-01T23:59:59.000Z

    We compute magnetic helicity and energy spectra of the solar active region NOAA 11158 during 11-15 February 2011 at 20 degr southern heliographic latitude using observational photospheric vector magnetograms. We adopt the isotropic representation of the Fourier-transformed two-point correlation tensor of the magnetic field. The sign of magnetic helicity turns out to be predominantly positive at all wavenumbers. This sign is consistent with what is theoretically expected for the southern hemisphere. The relative magnetic helicity is around 8% and strongest at intermediate wavenumbers of k ~ 0.4 Mm^{-1}, corresponding to a scale of 2 pi/k ~ 16 Mm. The same sign and a somewhat smaller value is also found for the relative current helicity evaluated in real space based on the vertical components of magnetic field and current density. The current helicity spectrum is estimated from the magnetic helicity spectrum and its modulus shows a k^{-5/3} spectrum at large wavenumbers. A similar power law is also obtained for...

  15. The role of filament activation in a solar eruption

    E-Print Network [OSTI]

    da Costa, Fatima Rubio; Fletcher, Lyndsay; Romano, Paolo; Labrosse, Nicolas

    2014-01-01T23:59:59.000Z

    Observations show that the mutual relationship between filament eruptions and solar flares cannot be described in terms of an unique scenario. In some cases, the eruption of a filament appears to trigger a flare, while in others the observations are more consistent with magnetic reconnection that produces both the flare observational signatures (e.g., ribbons, plasma jets, post-flare loops, etc.) and later the destabilization and eruption of a filament. We study an event which occurred in NOAA 8471, where a flare and the activation of (at least) two filaments were observed on 28 February 1999. By using imaging data acquired in the 1216, 1600, 171 and 195 \\AA\\ TRACE channels and by BBSO in the continnum and in H$\\alpha$, a morphological study of the event is carried out. Using TRACE 1216 and 1600 \\AA\\ data, an estimate of the "pure" Ly$\\alpha$ power is obtained. The extrapolation of the magnetic field lines is done using the SOHO/MDI magnetograms and assuming a potential field. The potential magnetic field ext...

  16. Solar-energy-system performance evaluation update: GSA/Federal Youth Center, Bastrop, Texas, October 1982-April 1983

    SciTech Connect (OSTI)

    Logee, T.L.

    1983-01-01T23:59:59.000Z

    This report is the second in a series of performance evaluation reports on the GSA/Federal Youth Center located in Bastrop, Texas. The GSA/Federal Youth Center is a federal correctional institute for youthful, male offenders in Bastrop, Texas. The active solar energy system is equipped with: 21,760 square feet of single-glazed, liquid flat-plate collectors manufactured by Cole Solar Systems. The storage consists of 40,000 gallons of insulated outdoor water tanks. Two 100-horsepower boilers and one 30-horsepower boiler burning natural gas with the capability to use Number 2 diesel fuel make up the auxiliary system. Solar energy is used to supply the hot water and space heating loads of the dormitory, offices, cafeteria, and hospital. During the summer, solar energy can also be used to supply some of the cooling load. The solar energy system at this Federal Correctional Institute operated well from October 1982 through April 1983. The solar system provided an estimated 12% or 866 million of the estimated total load of 7600 million Btu. There were 10 days of downtime in April caused by a failure of the collector pump. However, the collector pump high-speed motor had started to fail earlier in November. There were no other unusual solar system maintenance requirements during this period. The system performance during the monitoring period was 39% of the expected annual design performance, based on a proportional number of months.

  17. Environmental Assessment and Metrics for Solar: Case Study of SolFocus Solar Concentrator Systems

    E-Print Network [OSTI]

    Reich-Weiser, Corinne; Dornfeld, David; Horne, Steve

    2008-01-01T23:59:59.000Z

    of solar-thermal electricity gen- eration,” Solar Energy,Solar Thermal Wind Coal CC Gas Turbine Nuclear Reference EnergyEnergy pay- back time - a key number for the assessment of thermal solar

  18. Solar space- and water-heating system at Stanford University. Final report

    SciTech Connect (OSTI)

    Not Available

    1980-05-01T23:59:59.000Z

    Application of an active hydronic domestic hot water and space heating solar system for the Central Food Services Building is discussed. The closed-loop drain-back system is described as offering dependability of gravity drain-back freeze protection, low maintenance, minimal costs, and simplicity. The system features an 840 square-foot collector and storage capacity of 1550 gallons. The acceptance testing and the predicted system performance data are briefly described. Solar performance calculations were performed using a computer design program (FCHART). Bidding, costs, and economics of the system are reviewed. Problems are discussed and solutions and recommendations given. An operation and maintenance manual is given in Appendix A, and Appendix B presents As-built Drawings. (MCW)

  19. ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2008 C. Honsberg Photovoltaic Systems

    E-Print Network [OSTI]

    Honsberg, Christiana

    1 ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2008 C. Honsberg Photovoltaic Systems · Central issues in photovoltaic systems · Characteristics of energy systems & performance, these parameters determine the minimum effective system size. · Thermal-based systems are · PV systems are both

  20. Storage tank heat losses through thermosiphoning in two SFBP (the Solar in Federal Buildings Program) solar systems

    SciTech Connect (OSTI)

    Francetic, J.S.; Robinson, K.S.

    1987-07-01T23:59:59.000Z

    Comprehensive monitoring and performance analyses of Solar in Federal Buildings Program (SFBP) quality sites indicated that storage tank heat losses were significantly higher than design estimates. In some cases, measured losses were as much as 10 times the calculated losses. One potentially significant source of heat loss in solar systems is thermosiphoning. A series of tests was conducted at two SFBP quality solar systems to investigate the existence and magnitude of thermosiphon losses from storage subsystems.

  1. ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2008 C. Honsberg PV System Components

    E-Print Network [OSTI]

    Honsberg, Christiana

    · Batteries required if (1) load profile solar radiation profile and (2) to mitigate effect of variability · PV System components: ­ PV Modules ­ Batteries ­ Power Conditioning ­ Loads ­ Balance of systems #12

  2. P50/P90 Analysis for Solar Energy Systems Using the System Advisor Model: Preprint

    SciTech Connect (OSTI)

    Dobos, A. P.; Gilman, P.; Kasberg, M.

    2012-06-01T23:59:59.000Z

    To secure competitive financing for a solar energy generation project, the economic risk associated with interannual solar resource variability must be quantified. One way to quantify this risk is to calculate exceedance probabilities representing the amount of energy expected to be produced by a plant. Many years of solar radiation and metereological data are required to determine these values, often called P50 or P90 values for the level of certainty they represent. This paper describes the two methods implemented in the National Renewable Energy Laboratory's System Advisor Model (SAM) to calculate P50 and P90 exceedance probabilities for solar energy projects. The methodology and supporting data sets are applicable to photovoltaic, solar water heating, and concentrating solar power (CSP) systems.

  3. Design and Analysis of Micro-Solar Power Systems for Wireless

    E-Print Network [OSTI]

    California at Berkeley, University of

    Design and Analysis of Micro- Solar Power Systems for Wireless Sensor Networks Jaein Jeong UC in Richmond Field Station Trio Heliomote #12;3 Our Contributions · Model for micro-solar power system guideline for micro-solar power systems. #12;4 Organization · System Architecture · Model for Each Component

  4. The first disaggregated solar atlas of Djibouti: a decision-making tool for solar systems integration in the energy scheme

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    in "Renewable Energy 57 (2013) 57-69" DOI : 10.1016/j.renene.2013.01.030 #12;2 government looks for installing power systems using renewable energies, including solar systems, in order to overcome power supply, Energy planning, Ground measurements, Satellite-based solar atlas Nomenclatures hal-00801458,version1

  5. A DESIGN AND ANALYSIS TOOL FOR SOLAR ELECTRIC SYSTEMS

    E-Print Network [OSTI]

    Delaware, University of

    PV PLANNER A DESIGN AND ANALYSIS TOOL FOR SOLAR ELECTRIC SYSTEMS Updated User Manual May 2011 University of Delaware #12;Mailing Address: John Byrne Director Center for Energy and Environmental Policy) 831-3098 Website: http://ceep.udel.edu The Center for Energy and Environmental Policy conducts

  6. Presolar Silicate Grains: Constraints on Solar System Processes and

    E-Print Network [OSTI]

    Floss, Christine

    Presolar Silicate Grains: Constraints on Solar System Processes and Stellar Nucleosynthesis 63130, USA. (floss@wustl.edu) Presolar silicates are among the most abundant type of stardust and have. This is particularly true for presolar silicates, which are more susceptible to secondary processing than other, more

  7. Samples of Stars Beyond the Solar System: Silicate Grains in

    E-Print Network [OSTI]

    Samples of Stars Beyond the Solar System: Silicate Grains in Interplanetary Dust Scott Messenger,1 circumstellar silicate grains within interplanetary dust par- ticles (IDPs). Their extrasolar origins are amorphous silicate "GEMS" (glass with embedded metal and sulfides), which is consistent with astronomical

  8. Thermal Solar Energy Systems for Space Heating of Buildings 

    E-Print Network [OSTI]

    Gomri, R.; Boulkamh, M.

    2010-01-01T23:59:59.000Z

    In this study, the simulation and the analysis of a solar flat plate collectors combined with a compression heat pump is carried out. The system suggested must ensure the heating of a building without the recourse to an auxiliary energy source...

  9. Proton corebeam system in the expanding solar wind: Hybrid simulations

    E-Print Network [OSTI]

    California at Berkeley, University of

    Proton corebeam system in the expanding solar wind: Hybrid simulations Petr Hellinger1,2 and Pavel 9 November 2011. [1] Results of a twodimensional hybrid expanding box simulation of a proton to a decrease of the ratio between the proton perpendicular and parallel temperatures as well as to an increase

  10. Design Considerations for Solar Energy Harvesting Wireless Embedded Systems

    E-Print Network [OSTI]

    Raghunathan, Vijay; Kansal, Aman; Hsu, Jason; Friedman, Jonathan K; Srivastava, Mani B

    2005-01-01T23:59:59.000Z

    sensor node using our solar energy harvesting module. VI. CDesign Considerations for Solar Energy Harvesting Wirelessfactors. For example, solar energy supply is highly time

  11. Solar Energy Collection and Management for Networked Infomechanical Systems (NIMS)

    E-Print Network [OSTI]

    2003-01-01T23:59:59.000Z

    Networked Sensing Solar Energy Collection and Management forProposed Solution: Solar Energy Harvesting Why is Solarbeing recharged • Solar energy harvesting and storage allow

  12. Soiling losses for solar photovoltaic systems in California

    E-Print Network [OSTI]

    Mejia, Felipe A; Kleissl, Jan

    2013-01-01T23:59:59.000Z

    performance of a solar desalination plant operating in anfor concentrating solar power plants that are much morethe efficiency of solar PV plants. The accumulated soiling

  13. APPLICATION OF TURBOMACHINERY IN SOLAR-ASSISTED RANKINE COOLING SYSTEMS

    E-Print Network [OSTI]

    Leech, J.

    2010-01-01T23:59:59.000Z

    buildings in- volves a solar collector to provide energy tofluid leaving the solar collector. Because of the relativelyat a low tempera- ture using solar collectors; the vapor is

  14. Predicting the Long-Term Behavior of a Micro-Solar Power System JAEIN JEONG, Cisco Systems

    E-Print Network [OSTI]

    California at Berkeley, University of

    35 Predicting the Long-Term Behavior of a Micro-Solar Power System JAEIN JEONG, Cisco Systems DAVID CULLER, University of California, Berkeley Micro-solar power system design is challenging because it must of design options. Several micro-solar power systems and models have been made, validating particular points

  15. 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

    solar-thermal- assisted hvac system. Energy and Buildings, [of a Solar-Assisted HVAC System with Thermal Storage A.of a solar-assisted HVAC system with thermal storage. Energy

  16. Bimodal solar system based on a ultra-high-temperature TEC

    SciTech Connect (OSTI)

    Ogloblin, B.G.; Kirillov, E.Y.; Klimov, A.V.; Shalaev, A.I.; Shumov, D.P. [Central Design Bureau of Machine Building, Krasnogvardeyskaya Square 3, St. Petersburg, (Russia) 195272; Ender, A.Y.; Kuznetsov, V.I.; Sitnov, V.I. [Ioffe Physico-Technical Institute, Politekhnicheskaya St. 26, St. Petersburg, (Russia) 194021

    1996-03-01T23:59:59.000Z

    The paper considers an ecological, solar, bimodal system with ultra-high temperature thermionic energy converter (TEC). The solar bimodal Space Electric Propulsion System (SEPS) characteristics are presented. {copyright} {ital 1996 American Institute of Physics.}

  17. Solar Thermochemical Advanced Reactor System, Wins R&D 100 Award...

    Office of Environmental Management (EM)

    Solar Thermochemical Advanced Reactor System, Wins R&D 100 Award Solar Thermochemical Advanced Reactor System, Wins R&D 100 Award October 16, 2014 - 5:24pm Addthis Developed...

  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

    the subject of residential solar CHP, volumetric expansionthesis devoted to residential solar CHP systems) that inCHP system, in the 1-10 kW peak electric range, will be appropriate for small residential

  19. A performance data network for solar process heat systems

    SciTech Connect (OSTI)

    Barker, G.; Hale, M.J.

    1996-03-01T23:59:59.000Z

    A solar process heat (SPH) data network has been developed to access remote-site performance data from operational solar heat systems. Each SPH system in the data network is outfitted with monitoring equipment and a datalogger. The datalogger is accessed via modem from the data network computer at the National Renewable Energy Laboratory (NREL). The dataloggers collect both ten-minute and hourly data and download it to the data network every 24-hours for archiving, processing, and plotting. The system data collected includes energy delivered (fluid temperatures and flow rates) and site meteorological conditions, such as solar insolation and ambient temperature. The SPH performance data network was created for collecting performance data from SPH systems that are serving in industrial applications or from systems using technologies that show promise for industrial applications. The network will be used to identify areas of SPH technology needing further development, to correlate computer models with actual performance, and to improve the credibility of SPH technology. The SPH data network also provides a centralized bank of user-friendly performance data that will give prospective SPH users an indication of how actual systems perform. There are currently three systems being monitored and archived under the SPH data network: two are parabolic trough systems and the third is a flat-plate system. The two trough systems both heat water for prisons; the hot water is used for personal hygiene, kitchen operations, and laundry. The flat plate system heats water for meat processing at a slaughter house. We plan to connect another parabolic trough system to the network during the first months of 1996. We continue to look for good examples of systems using other types of collector technologies and systems serving new applications (such as absorption chilling) to include in the SPH performance data network.

  20. Performance of solar electric generating systems on the utility grid

    SciTech Connect (OSTI)

    Roland, J.R.

    1986-01-01T23:59:59.000Z

    The first year of performance of the Solar Electric Generating System I (SEGS I), which has been operating on the Southern California Edison (SCE) grid since December 1984 is discussed. The solar field, comprised of 71,680 m/sup 2/ of Luz parabolic trough line-focus solar collectors, supplies thermal energy at approx. 585/sup 0/F to the thermal storage tank. This energy is then used to generate saturated steam at 550 psia and 477/sup 0/F which passes through an independent natural gas-fired superheater and is brought to 780/sup 0/F superheat. The solar collector assembly (SCA) is the primary building block of this modular system. A single SCA consists of a row of eight parabolic trough collectors, a single drive motor, and a local microprocessor control unit. The basic components of the parabolic trough collector are a mirrored glass reflector, a unique and highly efficient heat collection element, and a tracking/positioning system. The heat collector element contains a stainless steel absorber tube coated with black chrome selective surface and is contained within an evacuated cylindrical glass envelope. The plant has reached the design capacity of 14.7 MW and, on a continuous basis, provides approx. 13.8 MW of net power during the utility's on-peak periods (nominally 12:00 noon to 6:00 p.m. during the summer weekdays and 5:00 p.m. to 10:00 p.m. during the winter weekdays).

  1. Solar Forecasting System and Irradiance Variability Characterization

    E-Print Network [OSTI]

    and Energy Reliability As part of Cooperative Agreement No. DE-EE0003507 Under Task 3.1: Photovoltaic Systems Reliability Under Cooperative Agreement No. DE-EE0003507 Hawai`i Energy Sustainability Program Subtask 3.1 Photovoltaic Systems: Report 3 Development of data base allowing managed access to statewide PV and insolation

  2. Utility Grid-Connected Distributed Power Systems National Solar Energy Conference

    E-Print Network [OSTI]

    Utility Grid-Connected Distributed Power Systems National Solar Energy Conference ASES Solar 96 at least half of its energy obtained from energy efficiency and renewable resources by the year 2000. Solar energy, distributed generation resource. Investments made in solar power today are expected to provide

  3. Geology and Photometric Variation of Solar System Bodies with Minor Atmospheres: Implications for Solid Exoplanets

    E-Print Network [OSTI]

    Fujii, Yuka; Dohm, James; Ohtake, Makiko

    2014-01-01T23:59:59.000Z

    A reasonable basis for future astronomical investigations of exoplanets lies in our best knowledge of the planets and satellites in the Solar System. Solar System bodies exhibit a wide variety of surface environments, even including potential habitable conditions beyond Earth, and it is essential to know how they can be characterized from outside the Solar System. In this study, we provide an overview of geological features of major Solar System solid bodies with minor atmospheres (i.e., the Terrestrial Moon, Mercury, the Galilean moons, and Mars) that affect surface albedo at local to global scale, and we survey how they influence point-source photometry in UV, visible, and near IR (i.e., the reflection-dominant range). We simulate them based on recent mapping products and also compile observed light curves where available. We show a 5-50% peak-to-trough variation amplitude in one spin rotation associated with various geological processes including heterogeneous surface compositions due to igneous activities...

  4. A perturbative approach for the study of compatibility between nonminimally coupled gravity and Solar System experiments

    E-Print Network [OSTI]

    Orfeu Bertolami; Riccardo March; Jorge Páramos

    2014-03-18T23:59:59.000Z

    We develop a framework for constraining a certain class of theories of nonminimally coupled (NMC) gravity with Solar System observations.

  5. Property Tax Abatement for Solar Electric Systems

    Broader source: Energy.gov [DOE]

    A Memorandum sent to County Commissioners in February 2011 clarified that residential PV systems that are not used to generate income or in connection with a business may be entirely exempt from ...

  6. Soiling losses for solar photovoltaic systems in California

    E-Print Network [OSTI]

    Mejia, Felipe A; Kleissl, Jan

    2013-01-01T23:59:59.000Z

    accumulation of dust on solar panels that causes a decreasenecessity of cleaning solar panels in California. In Sectionand tilt angle of the solar panels. 2.2 Solar Conversion

  7. Design Considerations for Solar Energy Harvesting Wireless Embedded Systems

    E-Print Network [OSTI]

    Raghunathan, Vijay; Kansal, Aman; Hsu, Jason; Friedman, Jonathan K; Srivastava, Mani B

    2005-01-01T23:59:59.000Z

    is supplied from the solar panel and only the remainder iscompo- nents, such as solar panels, and energy storageSolar World 4-4.0-100 solar panel. components from either

  8. Solar Energy Collection and Management for Networked Infomechanical Systems (NIMS)

    E-Print Network [OSTI]

    2003-01-01T23:59:59.000Z

    using the Siemens SP75 solar panels • Summer peak hours24 hour basis Mounting of Solar Panels • The Solar Array isthe most sunlight • The solar panels are hung below the NIMS

  9. Active System For Monitoring Volcanic Activity- A Case Study...

    Open Energy Info (EERE)

    Central Japan Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Active System For Monitoring Volcanic Activity- A Case Study Of The...

  10. A Practical Theory of Micro-Solar Power Sensor Networks JAEIN JEONG, Cisco Systems

    E-Print Network [OSTI]

    California at Berkeley, University of

    9 A Practical Theory of Micro-Solar Power Sensor Networks JAEIN JEONG, Cisco Systems DAVID CULLER, University of California, Berkeley Building a micro-solar power system is challenging because it must address develop a practical theory of micro-solar power systems that is materialized in a simulation suite

  11. National Aeronautics and Space Administration A Journey to the Beginning of the Solar System

    E-Print Network [OSTI]

    Waliser, Duane E.

    impossible--with a more conventional propulsion system. Two large solar panels, stretching approximately 19National Aeronautics and Space Administration Dawn A Journey to the Beginning of the Solar System of our Solar System. How is this "time travel" possible? Many thousands of small bodies orbit the Sun

  12. Preliminary Analysis of a Solar Heat Pump System with Seasonal Storage for Heating and Cooling 

    E-Print Network [OSTI]

    Yu, G.; Chen, P.; Dalenback, J.

    2006-01-01T23:59:59.000Z

    For higher solar fraction and suitability for both heating and cooling, a solar heat pump system with seasonal storage was studied in this paper. The system scheme and control strategy of a solar heat pump system with seasonal storage for heating...

  13. SOLAR HEAT GAIN THROUGH FENESTRATION SYSTEMS CONTAINING SHADING: SUMMARY OF PROCEDURES FOR

    E-Print Network [OSTI]

    SOLAR HEAT GAIN THROUGH FENESTRATION SYSTEMS CONTAINING SHADING: SUMMARY OF PROCEDURES that with a drastic simplifying assumption these methods can be used to calculate system solar-optical properties and solar heat gain coefficients for arbitrary glazing systems, while requiring limited data about

  14. SOLAR HEAT GAIN THROUGH FENESTRATION SYSTEMS CONTAINING SHADING: PROCEDURES FOR ESTIMATING

    E-Print Network [OSTI]

    SOLAR HEAT GAIN THROUGH FENESTRATION SYSTEMS CONTAINING SHADING: PROCEDURES FOR ESTIMATING that with a drastic simplifying assumption these methods can be used to calculate system solar-optical properties and solar heat gain coefficients for arbitrary glazing systems, while requiring limited data about

  15. IEA SHC TASK 44 and HPP Annex 38 Solar and heat pump systems

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    #12;IEA SHC TASK 44 and HPP Annex 38 Solar and heat pump systems T44A38 Dr. Anja Loose Institute for Thermodynamics and Thermal Engineering (ITW) Research and Testing Centre for Thermal Solar Systems (TZS) Dr.itw.uni-stuttgart.de Institute for Thermodynamics and Thermal Engineering Research and Testing Centre for Thermal Solar Systems

  16. Preliminary Analysis of a Solar Heat Pump System with Seasonal Storage for Heating and Cooling

    E-Print Network [OSTI]

    Yu, G.; Chen, P.; Dalenback, J.

    2006-01-01T23:59:59.000Z

    For higher solar fraction and suitability for both heating and cooling, a solar heat pump system with seasonal storage was studied in this paper. The system scheme and control strategy of a solar heat pump system with seasonal storage for heating...

  17. Maximizing Efficiency of Solar-Powered Systems by Load Matching

    E-Print Network [OSTI]

    Shinozuka, Masanobu

    energy. However, solar powered sys- tems must also consider the output level of the solar panel for power be counterproductive. Another problem that is of particular importance to solar pan- els is load matching. Solar panels is around 0.7­1.2, solar panels have a much larger Ri value as a function of the solar output and current

  18. Solar PV Manufacturing Cost Model Group: Installed Solar PV System Prices (Presentation)

    SciTech Connect (OSTI)

    Goodrich, A. C.; Woodhouse, M.; James, T.

    2011-02-01T23:59:59.000Z

    EERE's Solar Energy Technologies Program is charged with leading the Secretary's SunShot Initiative to reduce the cost of electricity from solar by 75% to be cost competitive with conventional energy sources without subsidy by the end of the decade. As part of this Initiative, the program has funded the National Renewable Energy Laboratory (NREL) to develop module manufacturing and solar PV system installation cost models to ensure that the program's cost reduction targets are carefully aligned with current and near term industry costs. The NREL cost analysis team has leveraged the laboratories' extensive experience in the areas of project finance and deployment, as well as industry partnerships, to develop cost models that mirror the project cost analysis tools used by project managers at leading U.S. installers. The cost models are constructed through a "bottoms-up" assessment of each major cost element, beginning with the system's bill of materials, labor requirements (type and hours) by component, site-specific charges, and soft costs. In addition to the relevant engineering, procurement, and construction costs, the models also consider all relevant costs to an installer, including labor burdens and overhead rates, supply chain costs, and overhead and materials inventory costs, and assume market-specific profits.

  19. Solar energy grid integration systems : final report of the Florida Solar Energy Center Team.

    SciTech Connect (OSTI)

    Ropp, Michael (Northern Plains Power Technologies, Brookings, SD); Gonzalez, Sigifredo; Schaffer, Alan (Lakeland Electric Utilities, Lakeland, FL); Katz, Stanley (Satcon Technology Corporation, Boston, MA); Perkinson, Jim (Satcon Technology Corporation, Boston, MA); Bower, Ward Isaac; Prestero, Mark (Satcon Technology Corporation, Boston, MA); Casey, Leo (Satcon Technology Corporation, Boston, MA); Moaveni, Houtan (Florida Solar Energy Center of the University of Central Florida, Cocoa, FL); Click, David (Florida Solar Energy Center of the University of Central Florida, Cocoa, FL); Davis, Kristopher (Florida Solar Energy Center of the University of Central Florida, Cocoa, FL); Reedy, Robert (Florida Solar Energy Center of the University of Central Florida, Cocoa, FL); Kuszmaul, Scott S.; Sena-Henderson, Lisa; David, Carolyn; Akhil, Abbas Ali

    2012-03-01T23:59:59.000Z

    Initiated in 2008, the Solar Energy Grid Integration Systems (SEGIS) program is a partnership involving the U.S. DOE, Sandia National Laboratories, private sector companies, electric utilities, and universities. Projects supported under the program have focused on the complete-system development of solar technologies, with the dual goal of expanding utility-scale penetration and addressing new challenges of connecting large-scale solar installations in higher penetrations to the electric grid. The Florida Solar Energy Center (FSEC), its partners, and Sandia National Laboratories have successfully collaborated to complete the work under the third and final stage of the SEGIS initiative. The SEGIS program was a three-year, three-stage project that include conceptual design and market analysis in Stage 1, prototype development and testing in Stage 2, and moving toward commercialization in Stage 3. Under this program, the FSEC SEGIS team developed a comprehensive vision that has guided technology development that sets one methodology for merging photovoltaic (PV) and smart-grid technologies. The FSEC team's objective in the SEGIS project is to remove barriers to large-scale general integration of PV and to enhance the value proposition of photovoltaic energy by enabling PV to act as much as possible as if it were at the very least equivalent to a conventional utility power plant. It was immediately apparent that the advanced power electronics of these advanced inverters will go far beyond conventional power plants, making high penetrations of PV not just acceptable, but desirable. This report summarizes a three-year effort to develop, validate and commercialize Grid-Smart Inverters for wider photovoltaic utilization, particularly in the utility sector.

  20. Solar-powered turbocompressor heat pump system

    DOE Patents [OSTI]

    Landerman, A.M.; Biancardi, F.R.; Melikian, G.; Meader, M.D.; Kepler, C.E.; Anderson, T.J.; Sitler, J.W.

    1982-08-12T23:59:59.000Z

    The turbocompressor comprises a power turbine and a compressor turbine having respective rotors and on a common shaft, rotatably supported by bearings. A first working fluid is supplied by a power loop and is expanded in the turbine. A second working fluid is compressed in the turbine and is circulated in a heat pump loop. A lubricant is mixed with the second working fluid but is excluded from the first working fluid. The bearings are cooled and lubricated by a system which circulates the second working fluid and the intermixed lubricant through the bearings. Such system includes a pump, a thermostatic expansion valve for expanding the working fluid into the space between the bearings, and a return conduit system for withdrawing the expanded working fluid after it passes through the bearings and for returning the working fluid to the evaporator. A shaft seal excludes the lubricant from the power turbine. The power loop includes a float operable by liquid working fluid in the condenser for controlling a recirculation valve so as to maintain a minimum liquid level in the condenser, while causing a feed pump to pump most of the working fluid into the vapor generator. The heat pump compressor loop includes a float in the condenser for operating and expansion valve to maintain a minimum liquid working fluid level in the condenser while causing most of the working fluid to be expanded into the evaporator.

  1. Solar heating and hot water system installed at office building, One Solar Place, Dallas, Texas. Final report

    SciTech Connect (OSTI)

    Not Available

    1980-06-01T23:59:59.000Z

    This document is the Final Report of the Solar Energy System Installed at the First Solar Heated Office Building, One Solar Place, Dallas, Texas. The Solar System was designed to provide 87 percent of the space heating needs, 100 percent of the potable hot water needs and is sized for future absorption cooling. The collection subsystem consists of 28 Solargenics, series 76, flat plate collectors with a total area of 1596 square feet. The solar loop circulates an ethylene glycol-water solution through the collectors into a hot water system heat exchanger. The hot water storage subsystem consists of a heat exchanger, two 2300 gallon concrete hot water storage tanks with built in heat exchangers and a back-up electric boiler. The domestic hot water subsystem sends hot water to the 10,200 square feet floor area office building hot water fixtures. The building cold water system provides make-up to the solar loop, the heating loop, and the hot water concrete storage tanks. The design, construction, cost analysis, operation and maintenance of the solar system are described. The system became operational July 11, 1979.

  2. Solar System Constraints on Gauss-Bonnet Mediated Dark Energy

    E-Print Network [OSTI]

    Luca Amendola; Christos Charmousis; Stephen C. Davis

    2007-10-02T23:59:59.000Z

    Although the Gauss-Bonnet term is a topological invariant for general relativity, it couples naturally to a quintessence scalar field, modifying gravity at solar system scales. We determine the solar system constraints due to this term by evaluating the post-Newtonian metric for a distributional source. We find a mass dependent, 1/r^7 correction to the Newtonian potential, and also deviations from the Einstein gravity prediction for light-bending. We constrain the parameters of the theory using planetary orbits, the Cassini spacecraft data, and a laboratory test of Newton's law, always finding extremely tight bounds on the energy associated to the Gauss-Bonnet term. We discuss the relevance of these constraints to late-time cosmological acceleration.

  3. South Dakota School of Mines, Keystone, South Dakota solar-energy-system performanceevaluation, June 1980-April 1981

    SciTech Connect (OSTI)

    Eck, T.F.

    1981-01-01T23:59:59.000Z

    The South Dakota School of Mines site is the Mount Rushmore National Memorial Visitor's Center in Keystone, South Dakota. The active solar energy system is a retrofit designed to supply 45% of the heating load and 53% of the observation room cooling load. The system is equipped with 2000 square feet of flat-plate collector panels double-glazed with a black chrome absorber surface; 3000 gallons of water in an insulated tank for sensible heat storage; a two-stage fuel oil furnace for auxiliary heating; and direct expansion electric air conditioning units for auxiliary cooling. The actual heating and cooling provided are 42% and 12% respectively. The solar fraction, solar savings ratio, conventional fueld savings, electrical energy expense, system performance factor, and solar system coefficient of performance are among the performance data listed. A control problem is reported that kept the collector pump running 24 hours a day for 18 days. Performance data are given for each subsystem as well as for the overall system. Typical system operation and the system operating sequence for a day are given. The system's use of solar energy and the percentage of losses are given. Also included are a system description, performance evaluation techniques and equations, long-term weather data, chemical analysis of the antifreeze solutions, sensor technology, and typical weather and performance data for a month. (LEW)

  4. Antenna system characteristic and solar radio burst observation

    E-Print Network [OSTI]

    Li, Sha; Chen, Zhijun; Wang, Wei; Liu, Donghao

    2015-01-01T23:59:59.000Z

    Chinese Spectral Radio Heliograph (CSRH) is an advanced aperture synthesis solar radio heliograph, developed by National Astronomical Observatories, Chinese Academy of Sciences independently. It consists of 100 reflector antennas, which are grouped into two antenna arrays (CSRH-I and CSRH-II) for low and high frequency bands respectively. The frequency band of CSRH-I is 0.4-2GHz and for CSRH-II, the frequency band is 2-15GHz. In the antenna and feed system, CSRH uses an Eleven feed to receive signals coming from the Sun, the radiation pattern with lower side lobe and back lobe of the feed is well radiated. The characteristics of gain G and antenna noise temperature T effect the quality of solar radio imaging. For CSRH, measured G is larger than 60 dBi and $ T $ is less than 120K, after CSRH-I was established, we have successfully captured a solar radio burst between 1.2-1.6GHz on November 12, 2010 through this instrument and this event was confirmed through the observation of Solar Broadband Radio Spectromete...

  5. Solar Electric Generating System II finite element analysis

    SciTech Connect (OSTI)

    Dohner, J.L.; Anderson, J.R.

    1994-04-01T23:59:59.000Z

    On June 2, 1992, Landers` earthquake struck the Solar Electric Generating System II, located in Daggett, California. The 30 megawatt power station, operated by the Daggett Leasing Corporation (DLC), suffered substantial damage due to structural failures in the solar farm. These failures consisted of the separation of sliding joints supporting a distribution of parabolic glass mirrors. At separation, the mirrors fell to the ground and broke. It was the desire of the DLC and the Solar Thermal Design Assistance Center (STDAC) of Sandia National Laboratories (SNL) and to redesign these joints so that, in the event of future quakes, costly breakage will be avoided. To accomplish this task, drawings of collector components were developed by the STDAC, from which a detailed finite element computer model of a solar collector was produced. This nonlinear dynamic model, which consisted of over 8,560 degrees of freedom, underwent model reduction to form a low order nonlinear dynamic model containing only 40 degrees of freedom. This model was then used as a design tool to estimate joint dynamics. Using this design tool, joint configurations were modified, and an acceptable joint redesign determined. The results of this analysis showed that the implementation of metal stops welded to support shafts for the purpose of preventing joint separation is a suitable joint redesign. Moreover, it was found that, for quakes of Landers` magnitude, mirror breakage due to enhanced vibration in the trough assembly is unlikely.

  6. System Performance Measurement Supports Design Recommendations for Solar Ventilation Preheat System (Brochure)

    SciTech Connect (OSTI)

    Not Available

    2011-08-01T23:59:59.000Z

    Technical briefing to report the outcomes of a data monitoring effort to determine the nature of solar vent preheat system performance problems at a U.S. military installation. The analysis reports up-to-date research and findings regarding system design, helping to clarify the issue as a factor of system design, rather than a shortcoming of SVP systems.

  7. 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...

  8. Solar System experiments do not yet veto modified gravity models

    E-Print Network [OSTI]

    Valerio Faraoni

    2006-07-05T23:59:59.000Z

    The dynamical equivalence between modified and scalar-tensor gravity theories is revisited and it is concluded that it breaks down in the limit to general relativity. A gauge-independent analysis of cosmological perturbations in both classes of theories lends independent support to this conclusion. As a consequence, the PPN formalism of scalar-tensor gravity and Solar System experiments do not veto modified gravity, as previously thought.

  9. Solar Survey of PV System Owners: San Diego

    Broader source: Energy.gov [DOE]

    The purpose of the survey was to understand the motivation, challenges and benefits perceived by individuals who decided to install solar systems in the City of San Diego. Approximately 2000 surveys were sent, and 641 surveys were completed. The primary response was from the residential sector. Individuals had the option to reply electronically, using Survey Monkey, or to complete a paper survey. All responses were combined and checked to ensure that there were no duplicates.

  10. Solar space and water heating system installed at Charlottesville, Virginia

    SciTech Connect (OSTI)

    Greer, Charles R.

    1980-09-01T23:59:59.000Z

    The solar energy system located at David C. Wilson Neuropsychiatric Hospital, Charlottesville, Virginia, consists of 88 single glazed, Sunworks Solector copper base plate collector modules; hot water coils in the hot air ducts; a domestic hot water (DHW) preheat tank; a 3,000 gallon concrete urethane-insulated storage tank and other miscellaneous components. This report includes extracts from the site files, specifications, drawings, installation, operation and maintenance instructions.

  11. 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...

  12. Exploring the Outer Solar System with the ESSENCE Supernova Survey

    SciTech Connect (OSTI)

    Becker, A.C.; /Washington U., Seattle, Astron. Dept.; Arraki, K.; /Washington U., Seattle, Astron. Dept.; Kaib, N.A.; /Washington U., Seattle, Astron. Dept.; Wood-Vasey, W.M.; /Harvard-Smithsonian Ctr. Astrophys.; Aguilera, C.; /Cerro-Tololo InterAmerican Obs.; Blackman, J.W.; /Australian Natl. U., Canberra; Blondin, S.; /Harvard-Smithsonian Ctr. Astrophys.; Challis, P.; /Harvard-Smithsonian Ctr. Astrophys.; Clocchiatti, A.; /Rio de Janeiro, Pont. U. Catol.; Covarrubias, R.; /Kyushu Sangyo U.; Damke, G.; /Cerro-Tololo InterAmerican Obs.; Davis, T.M.; /Bohr Inst. /Queensland U.; Filippenko, A.V.; /UC, Berkeley; Foley, R.J.; /UC, Berkeley; Garg, A.; /Harvard-Smithsonian Ctr. Astrophys. /Harvard U.; Garnavich, P.M.; /Notre Dame U.; Hicken, M.; /Harvard-Smithsonian Ctr. Astrophys. /Harvard U.; Jha, S.; /Harvard U. /SLAC; Kirshner, R.P.; /Harvard-Smithsonian Ctr. Astrophys.; Krisciunas, K.; /Notre Dame U. /Texas A-M; Leibundgut, B.; /Munich, Tech. U. /UC, Berkeley /NOAO, Tucson /Washington U., Seattle, Astron. Dept. /Fermilab /Harvard-Smithsonian Ctr. Astrophys. /Harvard U. /Chile U., Santiago /Ohio State U. /Cerro-Tololo InterAmerican Obs. /Harvard U. /Baltimore, Space Telescope Sci. /Johns Hopkins U. /Australian Natl. U., Canberra /Australian Natl. U., Canberra /Cerro-Tololo InterAmerican Obs. /Munich, Tech. U. /Harvard-Smithsonian Ctr. Astrophys. /Harvard U. /Cerro-Tololo InterAmerican Obs. /Texas A-M /Cerro-Tololo InterAmerican Obs.

    2011-11-10T23:59:59.000Z

    We report the discovery and orbital determination of 14 trans-Neptunian objects (TNOs) from the ESSENCE Supernova Survey difference imaging data set. Two additional objects discovered in a similar search of the SDSS-II Supernova Survey database were recovered in this effort. ESSENCE repeatedly observed fields far from the solar system ecliptic (-21{sup o} < {beta} < -5{sup o}), reaching limiting magnitudes per observation of I {approx} 23.1 and R {approx} 23.7. We examine several of the newly detected objects in detail, including 2003 UC{sub 414}, which orbits entirely between Uranus and Neptune and lies very close to a dynamical region that would make it stable for the lifetime of the solar system. 2003 SS{sub 422} and 2007 TA{sub 418} have high eccentricities and large perihelia, making them candidate members of an outer class of TNOs. We also report a new member of the 'extended' or 'detached' scattered disk, 2004 VN{sub 112}, and verify the stability of its orbit using numerical simulations. This object would have been visible to ESSENCE for only {approx}2% of its orbit, suggesting a vast number of similar objects across the sky. We emphasize that off-ecliptic surveys are optimal for uncovering the diversity of such objects, which in turn will constrain the history of gravitational influences that shaped our early solar system.

  13. SOLARCAP: Super Capacitor Buffering of Solar Energy for Self-Sustainable Field Systems

    E-Print Network [OSTI]

    Shen, Kai

    buffering, a system that we call SOLARCAP. Using solar panels paired with super-capacitors presents uniqueSOLARCAP: Super Capacitor Buffering of Solar Energy for Self-Sustainable Field Systems Amal Fahad of the conventional battery-based energy storage, this paper argues that the super capacitor buffering of solar energy

  14. Optimal design and integration of solar systems and fossil fuels for process cogeneration 

    E-Print Network [OSTI]

    Tora, Eman Abdel-Hakim Aly Mohamed

    2009-05-15T23:59:59.000Z

    from solar energy). The second is the use of thermal energy storage (TES) systems to save solar energy in a thermal form and use it when solar input decreases. A common TES configuration is the two-tank system which allows the use of the collector heat...

  15. Solar/hydrogen systems for the 1985 to 2000 time frame. Volume I. Solar/hydrogen systems assessment. Final report

    SciTech Connect (OSTI)

    Foster, R. W.; Tison, R. R.; Escher, W. J.D.; Hanson, J. A.

    1980-06-01T23:59:59.000Z

    The findings of a study of opportunities for commercialization of systems capable of producing hydrogen from solar energy are presented in two volumes. A compendium of monographs by specialists in the fields of solar energy conversion technologies, hydrogen production technologies and related technology descriptions from the general literature comprise Volume II. This data base was used to support an evaluation and selection process that identified four candidate solar/hydrogen systems best suited to commercialization within the next two decades. Volume I first reviews the background of the work and the methods used. Then an evaluation of the hydrogen product costs that might be achieved by the four selected candidate systems (photovoltaic/water electrolysis, thermal-heat engine/water electrolysis, wind energy/water electrolysis, small hydrogen/water electrolysis) is compared with the pricing structure and practices of the commodity gas market. Subsequently, product cost and market price match is noted to exist in the small user sector of the hydrogen marketplace. Barriers to and historical time lags in, commercialization of new technologies are then reviewed. Finally, recommendations for development and demonstration programs designed to accelerate the commercialization of the candidate systems are presented.

  16. A solar photovoltaic power system for use in Antarctica

    SciTech Connect (OSTI)

    Kohout, L.L.; Merolla, A.; Colozza, A.

    1993-12-01T23:59:59.000Z

    A solar photovoltaic power system was designed and built at the NASA Lewis Research Center as part of the NASA/NSF Antarctic Space Analog Program. The system was installed at a remote field camp at Lake Hoare in the Dry Valleys, and provided a six-person field team with electrical power for personal computers and printers, lab equipment, lighting, and a small microwave oven. The system consists of three silicon photovoltaic sub-arrays delivering a total of 1.5 kWe peak power, three lead-acid gel battery modules supplying 2.4 kWh, and an electrical distribution system which delivers 120 Vac and 12 Vdc to the user. The system was modularized for ease of deployment and operation. Previously the camp has been powered by diesel generators, which have proven to be both noisy and polluting. The NSF, in an effort to reduce their dependence on diesel fuel from both an environmental and cost standpoint, is interested in the use of alternate forms of energy, such as solar power. Such a power system also will provide NASA with important data on system level deployment and operation in a remote location by a minimally trained crew, as well as validate initial integration concepts.

  17. Promising freeze protection alternatives in solar domestic hot water systems

    SciTech Connect (OSTI)

    Bradley, D.E.

    1997-12-31T23:59:59.000Z

    Since the gains associated with solar thermal energy technologies are comparatively small in relation to the required capital investment, it is vital to maximize conversion efficiency. While providing the necessary function of freeze protection, the heat exchanger commonly included in solar domestic water heating systems represents a system inefficiency. This thesis explores two alternate methods of providing freeze protection without resorting to a heat exchanger. Commonly, collectors are made of rigid copper tubes separated by copper or aluminum fins. Cracking damage can occur when water is allowed to freeze and expand inside the non compliant tubes. The possibility of making collectors out of an elastic material was investigated and shown to be effective. Since unlike copper, elastomers typically have low thermal conductivities, the standard collector performance prediction equations do not apply. Modified thermal performance prediction equations were developed which can be used for both low and high thermal conductivity materials to provide accurate predictions within a limited range of plate geometries. An elastomeric collector plate was then designed and shown to have comparable performance to a copper plate collector whose aperture area is approximately 33% smaller. Another options for providing freeze protection to an SDHW system is to turn it off during the winter. Choosing a three-season operating period means two things. First, the system will have different optimums such as slope and collector area. Second, the wintertime solar energy incident on the collector is unavailable for meeting a heating load. However, the system`s heat exchanger becomes unnecessary and removing it increases the amount of energy that arrives at the storage tank during those periods in which the system is operating.

  18. Cryomagmatism in the outer solar system

    SciTech Connect (OSTI)

    Kargel, J.S.

    1990-01-01T23:59:59.000Z

    Assemblages of cryovolcanic, tectonic, and impact structures form varied landscapes quite alien in their collective expression. Many variables can affect the cryovolcanic style of a satellite but none more so than cryolava composition. The compositional variable is examined in considerable detail. Existing knowledge of phase equilibria and physical properties of cosmochemically relevant unary, binary, and multi-component chemical systems are summarized. Where published knowledge was found lacking, measurements of the physical chemistry of volatile mixtures are presented. Cryovolcanic landscapes are briefly toured, and knowledge of the physical chemistry of volatile mixtures is applied to problems of cryovolcanological interest. Aqueous cryolavas may range in composition from salt-water brines to cryogenic ammonia-water-rich multi-components solutions possibly involving methanol, ammonium sulfide, alkali chlorides, and many other potential components. Cryomagmatic distillation can greatly accentuate the importance of trace and minor constituents of icy satellites. The viscosities, densities, and other physical properties of these liquids vary considerably and depend sensitively on their exact compositions. These properties affect everything from cryovolcanic eruptive styles and landforms, to the way cryovolcanic crusts respond to tectonic stress. It is believed that the compositional variable is directly or indirectly implicated in a wide varity of geomorphic aspects of contrast among the icy satellites. Thus, even though as yet any specific morphology can be attributed to a specific composition, there appears to be a powerful link between composition of the ices originally accreted by a satellite and its subsequent interior evolution and exterior geomorphic appearance.

  19. New mineralogy of the outer solar system and the high-pressure behaviour of methane 

    E-Print Network [OSTI]

    Maynard-Casely, Helen E.

    2009-01-01T23:59:59.000Z

    This thesis will introduce the study of methane as a mineral. Along with ammonia and water, methane is one of the main planetary-forming materials in the outer solar system. The topic of `new mineralogy of the outer solar ...

  20. Design and Experiments of a Solar Low-temperature Hot Water Floor Radiant Heating System 

    E-Print Network [OSTI]

    Wu, Z.; Li, D.

    2006-01-01T23:59:59.000Z

    The solar low-temperature hot water floor radiant heating system combines solar energy heating with floor radiant heating. This kind of environmental heating way not only saves fossil resources and reduces pollution, but also makes people feel more...

  1. Modeling and analysis of hybrid geothermal-solar thermal energy conversion systems

    E-Print Network [OSTI]

    Greenhut, Andrew David

    2010-01-01T23:59:59.000Z

    Innovative solar-geothermal hybrid energy conversion systems were developed for low enthalpy geothermal resources augmented with solar energy. The goal is to find cost-effective hybrid power cycles that take advantage of ...

  2. Integration and Optimization of Trigeneration Systems with Solar Energy, Biofuels, Process Heat and Fossil Fuels 

    E-Print Network [OSTI]

    Tora, Eman

    2012-02-14T23:59:59.000Z

    at developing a systematic approach to integrate solar energy into industrial processes to drive thermal energy transfer systems producing power, cool, and heat. Solar energy is needed to be integrated with other different energy sources (biofuels, fossil fuels...

  3. Further descrip-on of the solar radia-on balance of the climate system

    E-Print Network [OSTI]

    Further descrip-on of the solar radia-on balance of the climate system....cycles of cold and warm climate. Averaged over the globe: HAS222d Solar radia-on, the greenhouse, global heat engine h

  4. Design and Experiments of a Solar Low-temperature Hot Water Floor Radiant Heating System

    E-Print Network [OSTI]

    Wu, Z.; Li, D.

    2006-01-01T23:59:59.000Z

    The solar low-temperature hot water floor radiant heating system combines solar energy heating with floor radiant heating. This kind of environmental heating way not only saves fossil resources and reduces pollution, but also makes people feel more...

  5. Integrating Solar Thermal and Photovoltaic Systems in Whole Building Energy Simulation 

    E-Print Network [OSTI]

    Cho, S.; Haberl, J.

    2010-01-01T23:59:59.000Z

    This paper introduces methodologies on how the renewable energy generated by the solar thermal and solar photovoltaic (PV) systems installed on site can be integrated in the whole building simulation analyses, which then can be available to analyze...

  6. Investigation of a Novel Solar Assisted Water Heating System with Enhanced Energy Yield for Buildings 

    E-Print Network [OSTI]

    Zhang, X.; Zhao, X.; Xu, J.; Yu, X.

    2012-01-01T23:59:59.000Z

    simulation and experimental verification. The unique characteristic of such system consists in the integrated loop heat pipe and heat pump unit (LHP-HP), which was proposed to improve solar photovoltaic (PV) generation, capture additional solar heat...

  7. Dual-temperature Kalina cycle for geothermal-solar hybrid power systems

    E-Print Network [OSTI]

    Boghossian, John G

    2011-01-01T23:59:59.000Z

    This thesis analyzes the thermodynamics of a power system coupling two renewable heat sources: low-temperature geothermal and a high-temperature solar. The process, referred to as a dual-temperature geothermal-solar Kalina ...

  8. Integration and Optimization of Trigeneration Systems with Solar Energy, Biofuels, Process Heat and Fossil Fuels

    E-Print Network [OSTI]

    Tora, Eman

    2012-02-14T23:59:59.000Z

    at developing a systematic approach to integrate solar energy into industrial processes to drive thermal energy transfer systems producing power, cool, and heat. Solar energy is needed to be integrated with other different energy sources (biofuels, fossil fuels...

  9. Adsorption at the nanoparticle interface for increased thermal capacity in solar thermal systems

    E-Print Network [OSTI]

    Thoms, Matthew W

    2012-01-01T23:59:59.000Z

    In concentrated solar power (CSP) systems, high temperature heat transfer fluids (HTFs) are responsible for collecting energy from the sun at the solar receiver and transporting it to the turbine where steam is produced ...

  10. Generic solar photovoltaic system dynamic simulation model specification.

    SciTech Connect (OSTI)

    Ellis, Abraham; Behnke, Michael Robert; Elliott, Ryan Thomas

    2013-10-01T23:59:59.000Z

    This document is intended to serve as a specification for generic solar photovoltaic (PV) system positive-sequence dynamic models to be implemented by software developers and approved by the WECC MVWG for use in bulk system dynamic simulations in accordance with NERC MOD standards. Two specific dynamic models are included in the scope of this document. The first, a Central Station PV System model, is intended to capture the most important dynamic characteristics of large scale (> 10 MW) PV systems with a central Point of Interconnection (POI) at the transmission level. The second, a Distributed PV System model, is intended to represent an aggregation of smaller, distribution-connected systems that comprise a portion of a composite load that might be modeled at a transmission load bus.

  11. Measured piping and component heat losses from a typical SFBP (Solar in Federal Buildings Program) solar system

    SciTech Connect (OSTI)

    Francetic, J.S.; Robinson, K.S.

    1987-07-01T23:59:59.000Z

    Recent comprehensive monitoring of solar energy systems has indicated that heat losses from system piping and components are much higher than originally expected. Theoretical analyses conducted at the Energy Technology Engineering Center (ETEC) predict that operating plus standby (during shutdown) heat losses from a typical solar system could equal up to one-third of the total gross solar energy collected by the system. Detailed heat loss experiments were conducted on a Solar in Federal Buildings Program (SFBP)-monitored site to identify and quantify actual piping, component, and thermosiphon heat losses for a typical day. The selected solar system, SFBP 4008, is a solar space heating and domestic hot water (DHW) system located at the Eisenhower Memorial Museum at Abilene, Kansas. The system has 4200 ft/sup 2/ of collector array located at a considerable distance from the mechanical building. Long lengths of exterior above-ground and buried piping connect the collectors to the mechanical room. Valves and pumps are uninsulated. The heat loss experiments at the Eisenhower site showed that 25% of the energy collected on a summer day was lost in pipes and components. Detailed results are given. 8 refs., 64 figs., 17 tabs.

  12. Optical system for determining physical characteristics of a solar cell

    DOE Patents [OSTI]

    Sopori, Bhushan L. (Denver, CO)

    2001-01-01T23:59:59.000Z

    The invention provides an improved optical system for determining the physical characteristics of a solar cell. The system comprises a lamp means for projecting light in a wide solid-angle onto the surface of the cell; a chamber for receiving the light through an entrance port, the chamber having an interior light absorbing spherical surface, an exit port for receiving a beam of light reflected substantially normal to the cell, a cell support, and an lower aperture for releasing light into a light absorbing baffle; a means for dispersing the reflection into monochromatic components; a means for detecting an intensity of the components; and a means for reporting the determination.

  13. Do mirror planets exist in our solar system?

    E-Print Network [OSTI]

    R. Foot; Z. K. Silagadze

    2001-04-15T23:59:59.000Z

    Mirror matter is predicted to exist if parity is an unbroken symmetry of nature. Currently, there is a large amount of evidence that mirror matter actually exists coming from astrophysics and particle physics. One of the most fascinating (but speculative) possibilities is that there is a significant abundance of mirror matter within our solar system. If the mirror matter condensed to form a large body of planatary or stellar mass then there could be interesting observable effects. Indeed studies of long period comets suggest the existence of a solar companion which has escaped direct detection and is therefore a candidate for a mirror body. Nemesis, hypothetical "death star" companion of the Sun, proposed to explain biological mass extinctions, may potentially be a mirror star. We examine the prospects for detecting these objects if they do indeed exist and are made of mirror matter.

  14. Solar hydrogen energy system. Annual report, 1995--1996

    SciTech Connect (OSTI)

    Veziroglu, T.N.

    1996-12-31T23:59:59.000Z

    The paper reports progress on three tasks. Task A, System comparison of hydrogen with other alternative fuels in terms of EPACT requirements, investigates the feasibility of several alternative fuels, namely, natural gas, methanol, ethanol, hydrogen and electricity, to replace 10% of gasoline by the year 2000. The analysis was divided into two parts: analysis of vehicle technologies and analysis of fuel production, storage and distribution. Task B, Photovoltaic hydrogen production, involves this fuel production method for the future. The process uses hybrid solar collectors to generate dc electricity, as well as high temperature steam for input to the electrolyzer. During the first year, solar to hydrogen conversion efficiencies have been considered. The third task, Hydrogen safety studies, covers two topics: a review of codes, standards, regulations, recommendations, certifications, and pamphlets which address safety of gaseous fuels; and an experimental investigation of hydrogen flame impingement.

  15. Solar-Driven Microbial Photoelectrochemical System for Energy Conversion

    E-Print Network [OSTI]

    Wang, Hanyu

    2015-01-01T23:59:59.000Z

    S. S. , A Perspective on Solar-Driven Water Splitting withI. S. ; Kim, I. S. , A Solar-Powered Microbial ElectrolysisD. R. , Development of a Solar-Powered Microbial Fuel Cell.

  16. Design Considerations for Solar Energy Harvesting Wireless Embedded Systems

    E-Print Network [OSTI]

    Raghunathan, Vijay; Kansal, Aman; Hsu, Jason; Friedman, Jonathan K; Srivastava, Mani B

    2005-01-01T23:59:59.000Z

    sensor node using our solar energy harvesting module. VI. Care not speci?c to solar energy harvesting, but representin the design of a solar energy harvesting module and their

  17. A self-consistent nonlinear force-free solution for a solar active region magnetic M.S. Wheatland

    E-Print Network [OSTI]

    Régnier, Stéphane

    fields 1. Introduction Solar coronal magnetic fields provide the source of energy for solar flaresA self-consistent nonlinear force-free solution for a solar active region magnetic field M.S. Wheatland Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia m

  18. Testing and modeling of a solar thermophotovoltaic power system

    SciTech Connect (OSTI)

    Stone, K.W. [McDonnell Douglas, 5301 Bolsa Ave, Huntington Bch., California 92647 (United States); Chubb, D.L.; Wilt, D.M. [NASA Lewis Research Center, 21000 Brookpark Rd., Cleveland, Ohio 44135 (United States); Wanlass, M.W. [National Renewable Energy Lab, 1617 Cole Boulevard, Golden, Colorado 80401 (United States)

    1996-02-01T23:59:59.000Z

    A solar thermophotovoltaic (STPV) power system has attractive attributes for both space and terrestrial applications. This paper presents the results of testing by McDonnell Douglas Aerospace (MDA) over the last year with components furnished by the NASA Lewis Research Center (LeRC) and the National Renewable Energy Lab (NREL). The testing has included a large scale solar TPV testbed system and small scale laboratory STPV simulator using a small furnace. The testing apparatus, instrumentation, and operation are discussed, including a description of the emitters and photovoltaic devices that have been tested. Over 50 on-sun tests have been conducted with the testbed system. It has accumulated over 300 hours of on-sun time, and 1.5 MWh of thermal energy incident on the receiver material while temperatures and I-V measurements were taken. A summary of the resulting test data is presented that shows the measured performance at temperatures up to 1220{degree}C. The receiver materials and PV cells have endured the high temperature operation with no major problems. The results of this investigation support MDA belief that STPV is a viable power system for both space and terrestrial power applications. {copyright} {ital 1996 American Institute of Physics.}

  19. Solar activity around AD 775 from aurorae and radiocarbon

    E-Print Network [OSTI]

    Neuhaeuser, Ralph

    2015-01-01T23:59:59.000Z

    A large variation in 14 C around AD 775 has been considered to be caused by one or more solar super-flares within one year. We critically review all known aurora reports from Europe as well as the Near, Middle, and Far East from AD 731 to 825 and find 39 likely true aurorae plus four more potential aurorae and 24 other reports about halos, meteors, thunderstorms etc., which were previously misinterpreted as aurorae or misdated; we assign probabilities for all events according to five aurora criteria. We find very likely true aurorae in AD 743, 745, 762, 765, 772, 773, 793, 796, 807, and 817. There were two aurorae in the early 770s observed near Amida (now Diyarbakir in Turkey near the Turkish-Syrian border), which were not only red, but also green-yellow - being at a relatively low geo-magnetic latidude, they indicate a relatively strong solar storm. However, it cannot be argued that those aurorae (geo-magnetical latitude 43 to 50 deg, considering five different reconstructions of the geo-magnetic pole) coul...

  20. Solar/gas systems impact analysis study. Final report, September 1982-July 1984

    SciTech Connect (OSTI)

    Hahn, E.F.; Preble, B.; Neill, C.P.; Loose, J.C.; Poe, T.E.

    1984-07-01T23:59:59.000Z

    The impacts of solar/gas technologies on gas consumers and on gas utilities was measured separately and compared against the impacts of competing gas and electric systems in four climatic regions of the U.S. A methodology was developed for measuring the benefits or penalties of solar/gas systems on a combined basis for consumers and distribution companies. The authors analysis shows that the combined benefits associated with solar/gas systems are generally greatest when the systems are purchased by customers who would have otherwise chosen high-efficiency electric systems (were solar/gas systems not available in the market place). The role of gas utilities in encouraging consumer acceptance of solar/gas systems was also examined in a qualitative fashion. The authors then developed a decision framework for analyzing the type and level of utility involvement in solar/gas technologies.

  1. Environmental Assessment and Metrics for Solar: Case Study of SolFocus Solar Concentrator Systems

    E-Print Network [OSTI]

    Reich-Weiser, Corinne; Dornfeld, David; Horne, Steve

    2008-01-01T23:59:59.000Z

    Environmental Assessment and Metrics for Solar: Case StudyEnvironmental Installation impacts of PV electricity generation - a critical comparison of energy supply options,” in 21st European Photovoltaic Solar

  2. 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 ...

  3. Project focus: Complete design of an interactive solar panel system to be situated on

    E-Print Network [OSTI]

    Project focus: · Complete design of an interactive solar panel system to be situated on top the effective area · Two types of solar cells: · 3 panel configurations: · Real-time power output data Si panels with 30.0o tilt c) 10 CdTe panels; 38.5o tilt · Solar insolation recorder, thermometer

  4. Solar heating and cooling of residential buildings: sizing, installation and operation of systems. 1980 edition

    SciTech Connect (OSTI)

    None

    1980-09-01T23:59:59.000Z

    This manual was prepared as a text for a training course on solar heating and cooling of residential buildings. The course and text are directed toward sizing, installation, operation, and maintenance of solar systems for space heating and hot water supply, and solar cooling is treated only briefly. (MHR)

  5. DAWN: A JOURNEY TO THE BEGINNING OF THE SOLAR SYSTEM C.T. Russell(1)

    E-Print Network [OSTI]

    Zuber, Maria

    -ray/neutron spectrometer, a magnetometer and a gravity investigation. Dawn uses solar arrays to power its xenon ion engine solar panels roughly 21 m tip-to-tip, a 5 m magnetometer boom and three ion thrusters, one of whichDAWN: A JOURNEY TO THE BEGINNING OF THE SOLAR SYSTEM C.T. Russell(1) , A. Coradini(2) , W

  6. Design and global optimization of high-efficiency solar thermal systems

    E-Print Network [OSTI]

    Soljaèiæ, Marin

    Design and global optimization of high-efficiency solar thermal systems with tungsten cermets David, Massachusetts 02139, USA bermel@mit.edu Abstract: Solar thermal, thermoelectric, and thermophotovoltaic (TPV by selective solar absorbers and TPV selective emitters. To improve these critical components, we study a class

  7. Use of Linear Predictive Control for a Solar Electric Generating System

    E-Print Network [OSTI]

    Wisconsin at Madison, University of

    behavior can be used to design and operate plants. The solar power plant is characterized by significant1 Use of Linear Predictive Control for a Solar Electric Generating System Thorsten Stuetzle, Nathan Blair, William A. Beckman, John W. Mitchell Solar Energy Laboratory University of Wisconsin-Madison 1500

  8. IntrAst1 (Petrovay) Chracteristics and origon of the Solar System LUNAR MOTION

    E-Print Network [OSTI]

    Petrovay, Kristóf

    (Petrovay) Chracteristics and origon of the Solar System ECLIPSES Moon completely in umbra: total lunar eclipse Moon partially in umbra: partial lunar eclipse [ Moon in penumbra: penumbral lunar eclipse in umbra: total solar eclipse Observer in penumbra: partial solar eclipse Observer beyond end of umbra

  9. Absorber and emitter for solar thermo-photovoltaic systems to achieve efficiency

    E-Print Network [OSTI]

    Fan, Shanhui

    Absorber and emitter for solar thermo- photovoltaic systems to achieve efficiency exceeding-junction solar cell can attain efficiency that exceeds the Shockley-Queisser limit. ©2009 Optical Society and links 1. W. Shockley, and H. J. Queisser, "Detailed Balance Limit of Efficiency of p-n Junction Solar

  10. Material and Chemical Processing (Concentrated Solar) (4 Activities...

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

    chemical reactions, and to treat materials for increased hardness and resistance to corrosion. The activities are: Can sunlight break down different kinds of plastics? Can...

  11. CSU Solar Housee III solar heating and cooling system performance. Annual report: technical summary, 1 October 1978-30 September 1979

    SciTech Connect (OSTI)

    Ward, D.S.; Ward, J.C.; Oberoi, H.S.

    1980-10-01T23:59:59.000Z

    The objective of this study was to test and evaluate the practicality of an integrated flat-plate state-of-the-art liquid-heating solar collector and absorption cooling system installed on Colorado State University (CSU) Solar House III. This objective was accomplished by designing and installing a complete solar heating and cooling system (including appropriate data acquisition equipment and instrumentation), performing a detailed analysis and evaluation of all aspects of the solar system, and comparing the seasonal performance of the system with two other solar heating and cooling systems installed in adjacent buildings with virtually identical thermal characteristics.

  12. Environmental Assessment and Metrics for Solar: Case Study of SolFocus Solar Concentrator Systems

    E-Print Network [OSTI]

    Reich-Weiser, Corinne; Dornfeld, David; Horne, Steve

    2008-01-01T23:59:59.000Z

    Environmental Installation impacts of PV electricity generation - a critical comparison of energy supply options,” in 21st European Photovoltaic Solar

  13. 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

  14. Solar-thermal-energy collection/storage-pond system

    DOE Patents [OSTI]

    Blahnik, D.E.

    1982-03-25T23:59:59.000Z

    A solar thermal energy collection and storage system is disclosed. Water is contained, and the water surface is exposed directly to the sun. The central part of an impermeable membrane is positioned below the water's surface and above its bottom with a first side of the membrane pointing generally upward in its central portion. The perimeter part of the membrane is placed to create a watertight boundary separating the water into a first volume which is directly exposable to the sun and which touches the membranes first side, and a second volumn which touches the membranes second side. A salt is dissolved in the first water volume.

  15. Innovative Systems for Solar Air Conditioning of Buildings 

    E-Print Network [OSTI]

    Kessling, W.; Peltzer, M.

    2004-01-01T23:59:59.000Z

    kessling@transsolar.com Dipl.-Ing. Matthias PELTZER Technical Director L-DCS Technology GmbH Muenchener Str. 101, 85737 Ismaning b. Munich matthias.peltzer@l-dcs.com ABSTRACT Solar air conditioning is an attractive technology to achieve comfortable room... states (4). The room return air (5) is used in a latent heat recovery (6) (psychometric process see Figure 4). To illuminate the excellent system performance a typical cooling load profile for a standard office build- ing in the hot and humid climate...

  16. Solar System tests of Ho?ava-Lifshitz black holes

    E-Print Network [OSTI]

    Francisco S. N. Lobo; Tiberiu Harko; Zoltán Kovács

    2010-01-20T23:59:59.000Z

    In the present paper we consider the possibility of observationally testing Horava gravity at the scale of the Solar System, by considering the classical tests of general relativity (perihelion precession of the planet Mercury, deflection of light by the Sun and the radar echo delay) for the Kehagias-Sfetsos asymptotically flat black hole solution of Horava-Lifshitz gravity. All these gravitational effects can be fully explained in the framework of the vacuum solution of Horava gravity, and it is shown that the analysis of the classical general relativistic tests severely constrain the free parameter of the solution.

  17. Differentiating Between Modified Gravity Theories in the Solar System

    E-Print Network [OSTI]

    Ali Mozaffari

    2014-03-21T23:59:59.000Z

    Building on previous work, we re-examine the possibility of testing MOdified Newtonian Dynamics near the saddle points of gravitational potentials in the Solar System, through an extension of the forthcoming LISA Pathfinder mission. We extend present analysis to include quasi-linear formulations of these theories, resulting from fully relativistic modified gravity theories. Using similar quantitative and qualitative tools, we demonstrate that in general, both the instrumental response and typical Signal to Noise Ratios for such a test will be different. Finally we investigate constraints from a negative result and parameterised free functions.

  18. Optimization of storage in passive solar heating systems. Final report

    SciTech Connect (OSTI)

    Bahm, R.J.

    1980-05-01T23:59:59.000Z

    The search for a simple method of estimating the optimum amount of storage for passive solar space heating system designs and the results of that search are described. The project goals, and why the project is important are described. The major project results are presented in the order of their importance with respect to meeting the project goal. A narrative description of the project is given. Here the various approaches attempted are described, giving the reasons for failure in those areas that were not successful. The Appendices contain the bulk of data generated by this project. Most of the data is presented in graphical form. (MHR)

  19. INTERACTION OF A SOLAR SPACE HEATING SYSTEM WITH THE THERMAL BEHAVIOR OF A BUILDING

    E-Print Network [OSTI]

    Vilmer, Christian

    2013-01-01T23:59:59.000Z

    P(t) UAB time constant. Heat input power from a fan coil orof a building in response to heat input from an active solarS.R. of a building under heat input conditions for active

  20. Solar-hydrogen energy system model for Libya

    SciTech Connect (OSTI)

    Eljrushi, G.S.

    1987-01-01T23:59:59.000Z

    A solar-hydrogen energy-system model for Libya was developed, obtaining relationships for and between the main energy and energy related parameters of Libya and the world. The parameters included are: population, energy demand, fossil-fuel production, fossil-fuel resources, hydrogen production, hydrogen introduction rates, energy prices, gross domestic product, pollution and quality of life. The trends of these parameters with and without hydrogen introduction were investigated over a period of time - through the year 2100. The results indicate that the fossil-fuel resources in Libya could be exhausted, due to production for local and export demands, within three to four decades unless serious measures for reducing production are taken. The results indicate that adopting solar-hydrogen energy system would extend the availability of fossil-fuel resources for a longer time period, reduce pollution, improve quality of life and establish a permanent energy system for Libya. It also shows that eventually Libya could export hydrogen in lieu of oil and natural gas.

  1. Flexible Solar-Energy Harvesting System on Plastic with Thin-film LC Oscillators Operating Above ft for

    E-Print Network [OSTI]

    Flexible Solar-Energy Harvesting System on Plastic with Thin-film LC Oscillators Operating Above ft- This paper presents an energy-harvesting system consisting of amorphous-silicon (a-Si) solar cells and thin of the energy-harvesting system. The solar module consists of solar cells in series operating at an output

  2. On the GCR intensity and the inversion of the heliospheric magnetic field during the periods of the high solar activity

    E-Print Network [OSTI]

    Krainev, M B

    2014-01-01T23:59:59.000Z

    We consider the long-term behavior of the solar and heliospheric parameters and the GCR intensity in the periods of high solar activity and the inversions of heliospheric magnetic field (HMF). The classification of the HMF polarity structures and the meaning of the HMF inversion are discussed. The procedure is considered how to use the known HMF polarity distribution for the GCR intensity modeling during the periods of high solar activity. We also briefly discuss the development and the nearest future of the sunspot activity and the GCR intensity in the current unusual solar cycle 24.

  3. Impact of Improved Solar Forecasts on Bulk Power System Operations in ISO-NE: Preprint

    SciTech Connect (OSTI)

    Brancucci Martinez-Anido, C.; Florita, A.; Hodge, B. M.

    2014-09-01T23:59:59.000Z

    The diurnal nature of solar power is made uncertain by variable cloud cover and the influence of atmospheric conditions on irradiance scattering processes. Its forecasting has become increasingly important to the unit commitment and dispatch process for efficient scheduling of generators in power system operations. This study examines the value of improved solar power forecasting for the Independent System Operator-New England system. The results show how 25% solar power penetration reduces net electricity generation costs by 22.9%.

  4. Level and length of cyclic solar activity during the Maunder minimum as deduced from the active day statistics

    E-Print Network [OSTI]

    Vaquero, J M; Usoskin, I G; Carrasco, V M S; Gallego, M C

    2015-01-01T23:59:59.000Z

    The Maunder minimum (MM) of greatly reduced solar activity took place in 1645-1715, but the exact level of sunspot activity is uncertain as based, to a large extent, on historical generic statements of the absence of spots on the Sun. Here we aim, using a conservative approach, to assess the level and length of solar cycle during the Maunder minimum, on the basis of direct historical records by astronomers of that time. A database of the active and inactive days (days with and without recorded sunspots on the solar disc respectively) is constructed for three models of different levels of conservatism (loose ML, optimum MO and strict MS models) regarding generic no-spot records. We have used the active day fraction to estimate the group sunspot number during the MM. A clear cyclic variability is found throughout the MM with peaks at around 1655--1657, 1675, 1684 and 1705, and possibly 1666, with the active day fraction not exceeding 0.2, 0.3 or 0.4 during the core MM, for the three models. Estimated sunspot nu...

  5. Global analysis of active longitudes of solar X-ray flares L. Zhang a,b,c

    E-Print Network [OSTI]

    Usoskin, Ilya G.

    Observatories, Chinese Academy of Sciences, Beijing, China c Key Laboratory of Solar Activity, Chinese AcademyGlobal analysis of active longitudes of solar X-ray flares L. Zhang a,b,c , K. Mursula a,Ã, I of Sciences, Beijing, China d University of Oulu, Sodankyl¨a Geophysical Observatory, Oulu, Finland a r t i c

  6. Incentive Pass-through for Residential Solar Systems in California

    Broader source: Energy.gov [DOE]

    The deployment of solar photovoltaic (PV) systems has grown rapidly over the last decade, partly because of various government incentives. In the United States, those established in California are among the largest and longest-running incentives. Building on past research, this report addresses the still-unanswered question: to what degree have the direct PV incentives in California been passed along from installers to consumers? This report addresses this question by carefully examining the residential PV market in California and applying both a structural-modeling approach and a reduced-form regression analysis to estimate the incentive pass-through rate. The results suggest an average pass-through rate of direct incentives of nearly 100%, but with regional differences among California counties. While these results could have multiple explanations, they suggest a relatively competitive market and well-functioning subsidy program. Further analysis is required to determine whether similar results broadly apply to other states, to other customer segments, to all third-party-owned PV systems, or to all forms of financial incentives for solar.

  7. Influence of Dark Matter on Light Propagation in Solar System

    E-Print Network [OSTI]

    Hideyoshi Arakida

    2009-11-17T23:59:59.000Z

    We investigated the influence of dark matter on light propagation in the solar system. We assumed the spherical symmetry of spacetime and derived the approximate solution of the Einstein equation, which consists of the gravitational attractions caused by the central celestial body, i.e. the Sun, and the dark matter surrounding it. We expressed the dark matter density in the solar system in the following simple power-law form, $\\varrho(t, r) = \\rho(t)(\\ell/r)^k$, where $t$ is the coordinate time; $r$, the radius from the central body; $\\ell$, the normalizing factor; $k$, the exponent characterizing $r$-dependence of dark matter density; and $\\rho(t)$, the arbitrary function of time $t$. On the basis of the derived approximate solution, we focused on light propagation and obtained the additional corrections of the gravitational time delay and the relative frequency shift caused by the dark matter. As an application of our results, we considered the secular increase in the astronomical unit reported by Krasinsky and Brumberg (2004) and found that it was difficult to provide an explanation for the observed $d{\\rm AU}/dt = 15 \\pm 4 ~[{\\rm m/century}]$.

  8. Solar system tests do not rule out 1/R gravity

    E-Print Network [OSTI]

    Qasem Exirifard

    2009-12-28T23:59:59.000Z

    We argue that Solar system tests do not rule out 1/R gravity at least due to the reason addressed in Phys. Rev. D 74 (2006) 121501 [astro-ph/0610483] (ref. [1]) and subsequent published papers. Ref. [1] has not only modified the Einstein-Hilbert action but also has changed the boundary conditions since they altered the equations of motion. In Einstein-Hilbert action equations are second order, so the fall off of the fields suffices to single out a unique solution. In 1/R gravity the equations are fourth order, so we should impose additional boundary conditions. Perhaps the boundary condition we must impose is that the abrupt change in the second derivative of the metric near the surface of the Sun remains intact by adding `1/R' corrections to the equations of motion. The solution of 1/R gravity with this boundary condition remains consistent with the solar system tests. Ref. [1] assumes that as soon as they perturbatively modified the equations then the Ricci scalar becomes smooth on the surface of the Sun. This assumption is simply wrong because the boundary conditions and equations of motions are two different entities.

  9. Disformal Theories of Gravity: From the Solar System to Cosmology

    E-Print Network [OSTI]

    Jeremy Sakstein

    2014-10-20T23:59:59.000Z

    This paper is concerned with theories of gravity that contain a scalar coupled both conformally and disformally to matter through the metric. By systematically deriving the non-relativistic limit, it is shown that no new non-linear screening mechanisms are present beyond the Vainshtein mechanism and chameleon-like screening. If one includes the cosmological expansion of the universe, disformal effects that are usually taken to be absent can be present in the solar system. When the conformal factor is absent, fifth-forces can be screened on all scales when the cosmological field is slowly-rolling. We investigate the cosmology of these models and use local tests of gravity to place new constraints on the disformal coupling and find $\\mathcal{M}>\\mathcal{O}(\\textrm{eV})$, which is not competitive with laboratory tests. Finally, we discuss the future prospects for testing these theories and the implications for other theories of modified gravity. In particular, the Vainshtein radius of solar system objects can be altered from the static prediction when cosmological time-derivatives are non-negligible.

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

    SciTech Connect (OSTI)

    Kelly, B.; Kearney, D.

    2006-07-01T23:59:59.000Z

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

  11. Japan's Solar Photovoltaic (PV) Market: An Analysis of Residential System Prices (Presentation)

    SciTech Connect (OSTI)

    James, T.

    2014-03-01T23:59:59.000Z

    This presentation summarizes market and policy factors influencing residential solar photovoltaic system prices in Japan, and compares these factors to related developments in the United States.

  12. Homeowners Guide to Financing a Grid-Connected Solar Electric System (Brochure)

    SciTech Connect (OSTI)

    Not Available

    2010-10-01T23:59:59.000Z

    This guide provides an overview of the financing options that may be available to homeowners who are considering installing a solar electric system on their house.

  13. EC/MS 573 Solar Energy Systems (This course is jointly offered as MS 573 Course)

    E-Print Network [OSTI]

    unknown authors

    Course Description: This course is designed for first year graduate and senior undergraduate students from engineering disciplines and is intended to educate students in the design and applications of solar energy engineering. It will focus on fundamentals of solar energy conversion, photovoltaic and photothermal engineering, optical systems, photoelectrochemical cells for hydrogen generation, and energy storage and distribution systems. The course covers solar energy insolation and global energy needs, current trends in solar plants, thin film solar cells, and solar cell material science. Design and installation of solar panels for residential and industrial applications and connections to the national grid and cost analysis will be discussed. In addition, basic manufacturing processes for the production of solar panels, environmental impacts, and the related system engineering aspects will be included to provide a comprehensive state-of-the art approach to solar energy utilization. Course Goals: 1. Learn the fundamentals of solar energy conversion systems, available solar energy and the local and national needs, photovoltaic and photothermal engineering applications, emerging technologies,

  14. On the relationship between cosmic rays, solar activity and powerful earthquakes

    E-Print Network [OSTI]

    Mikhail Kovalyov; Selena Kovalyov

    2015-02-10T23:59:59.000Z

    In this paper we analyze the correlation of cosmic rays intensity to increases in seismic activity. We also show that high-magnitude earthquakes appear in group. As a prequel, we discuss in \\S1 naive visualization of the solar-cosmic ray interplay.

  15. Seasonal and longitudinal variations of the solar quiet (Sq) current system during solar minimum determined by CHAMP satellite

    E-Print Network [OSTI]

    Forbes, Jeffrey

    .1029/2010JA016289. 1. Introduction [2] A common feature of geomagnetic field measurements is the regular daily and determined that the current system responsible for producing the geomagnetic daily variation was primarily associated with the geomagnetic daily variation is typically termed the solar quiet (Sq) current system

  16. 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

    output P e Electrical power output of system Q Solar CHP to1.5, the CHP system cost of electrical power is obtained.thermal to electrical power output R of this system is (1 ?

  17. Microcontroller Servomotor for Maximum Effective Power Point for Solar Cell System

    E-Print Network [OSTI]

    Al-Khalidy, M.; Al-Rawi, O.; Noaman, N.

    2010-01-01T23:59:59.000Z

    In this paper a Maximum Power point (MPP) tracking algorithm is developed using dual-axis servomotor feedback tracking control system. An efficient and accurate servomotor system is used to increase the system efficiency and reduces the solar cell...

  18. The Added Economic and Environmental Value of Solar Thermal Systems in Microgrids with Combined Heat and Power

    E-Print Network [OSTI]

    Marnay, Chris

    2010-01-01T23:59:59.000Z

    Economic and Environmental Value of Solar Thermal Systems inEconomic and Environmental Value of Solar Thermal Systems insolar thermal and heat storage systems can improve the economic, as well as environmental

  19. Denver Public Schools Get Solar Energy System | Department of...

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

    Kevin Craft What are the key facts? Local company adds five full-time jobs to support solar panel project. Solar panels are estimated to generate 1,640,457 kWh of electricity...

  20. Solar Water Heating with Low-Cost Plastic Systems (Brochure)

    SciTech Connect (OSTI)

    Not Available

    2012-01-01T23:59:59.000Z

    Newly developed solar water heating technology can help Federal agencies cost effectively meet the EISA requirements for solar water heating in new construction and major renovations. This document provides design considerations, application, economics, and maintenance information and resources.

  1. Thermoelectrics and aerogels for solar energy conversion systems

    E-Print Network [OSTI]

    McEnaney, Kenneth

    2015-01-01T23:59:59.000Z

    Concerns about climate change, the world's growing energy needs, and energy independence are driving demand for solar energy conversion technologies. Solar thermal electricity generation has the potential to ll this demand. ...

  2. Puerto Rico- Tax Deduction for Solar and Wind Energy Systems

    Broader source: Energy.gov [DOE]

    Puerto Rico offers a 30% tax deduction (up to $1500) for expenses incurred in the purchase and installation of solar equipment to heat water for residential use. "Solar equipment" is defined as ...

  3. Photovoltaic conversion in a common solar concentrating and spectrally splitting system

    SciTech Connect (OSTI)

    Yehezkel, N.; Appelbaum, J. [Tel-Aviv Univ. (Israel). Faculty of Engineering; Yogev, A. [Weizmann Inst. of Science, Rehovot (Israel)

    1994-12-31T23:59:59.000Z

    Several solar energy conversion processes can be utilized simultaneously using a common solar collector if the solar radiation is appropriately spectrally split. A concentrating and splitting system based on a Cassegrainian design may be used for photovoltaic energy conversion nd simultaneously for an additional energy conversion process such as for laser pumping that requires concentration. The spectral splitting may be achieved by a dichroic mirror for the secondary mirror of the Cassegrain. This approach was realized to study solar cells at different concentration, solar spectrum and temperatures.

  4. Combustion system for hybrid solar fossil fuel receiver

    DOE Patents [OSTI]

    Mehos, Mark S.; Anselmo, Kenneth M.; Moreno, James B.; Andraka, Charles E.; Rawlinson, K. Scott; Corey, John; Bohn, Mark S.

    2004-05-25T23:59:59.000Z

    A combustion system for a hybrid solar receiver comprises a pre-mixer which combines air and fuel to form an air-fuel mixture. The mixture is introduced tangentially into a cooling jacket. A burner plenum is fluidically connected to the cooling jacket such that the burner plenum and the cooling jacket are arranged in thermal contact with one another. The air-fuel mixture flows through the cooling jacket cooling the burner plenum to reduce pre-ignition of the air-fuel mixture in the burner plenum. A combustion chamber is operatively associated with and open to the burner plenum to receive the air-fuel mixture from the burner plenum. An igniter is operatively positioned in the combustion chamber to combust the air-fuel mixture, releasing heat. A recuperator is operatively associated with the burner plenum and the combustion chamber and pre-heats the air-fuel mixture in the burner plenum with heat from the combustion chamber. A heat-exchanger is operatively associated and in thermal contact with the combustion chamber. The heat-exchanger provides heat for the hybrid solar receiver.

  5. Decision process for the retrofit of municipal buildings with solar energy systems: a technical guide

    SciTech Connect (OSTI)

    Licciardello, Michael R.; Wood, Brian; Dozier, Warner; Braly, Mark; Yates, Alan

    1980-11-01T23:59:59.000Z

    As a background for solar applications, the following topics are covered: solar systems and components for retrofit installations; cost, performance, and quality considerations; and financing alternatives for local government. The retrofit decision process is discussed as follows: pre-screening of buildings, building data requirements, the energy conservation audit, solar system sizing and economics, comparison of alternatives, and implementation. Sample studies are presented for the West Valley Animal Shelter and the Hollywood Police Station. (MHR)

  6. Community Shared Solar with Solarize

    Broader source: Energy.gov [DOE]

    An overview of the concept behind The Solarize Guidebook, which offers neighborhoods a plan for getting volume discounts when making group purchases of rooftop solar energy systems.

  7. Evolution of Magnetic Helicity and Energy Spectra of Solar Active Regions

    E-Print Network [OSTI]

    Zhang, Hongqi; Sokoloff, D D

    2015-01-01T23:59:59.000Z

    We adopt an isotropic representation of the Fourier-transformed two-point correlation tensor of the magnetic field for estimating magnetic energy and helicity spectra as well as current helicity spectra of individual active regions and the change of their spectral indices with the solar cycle. The departure of the spectral index of current helicity from 5/3 is analyzed, and it is found that it is lower than that of magnetic energy. There is no obvious relationship between the change of the normalized magnetic helicity and the integral scale of the magnetic field for individual active regions. The evolution of the spectral index reflects the development and distribution of various scales of magnetic structures in active regions. It is found that around solar maximum the magnetic energy and helicity spectra are steeper.

  8. Concentrating Solar Power

    SciTech Connect (OSTI)

    Not Available

    2008-09-01T23:59:59.000Z

    Summarizes the goals and activities of the DOE Solar Energy Technologies Program efforts within its concentrating solar power subprogram.

  9. Space Nuclear Power and Propulsion - a basic Tool for the manned Exploration of the Solar System

    SciTech Connect (OSTI)

    Frischauf, Norbert; Hamilton, Booz Allen [ESA/ESTEC, Keplerlaan 1, P.O. Box 29, NL-2200 AG Noordwijk (Netherlands)

    2004-07-01T23:59:59.000Z

    Humanity has started to explore space more than 40 years ago. Numerous spacecraft have left the Earth in this endeavour, but while unmanned spacecraft were already sent out on missions, where they would eventually reach the outer limits of the Solar System, manned exploration has always been confined to the tiny bubble of the Earth's gravitational well, stretching out at maximum to our closest celestial companion - the Moon - during the era of the Apollo programme in the late 60's and early 70's. When mankind made its giant leap, the exploration of our cosmic neighbour was seen as the initial step for the manned exploration of the whole Solar System. Consequently ambitious research and development programmes were undertaken at that time to enable what seemed to be the next logical steps: the establishment of a permanent settled base on the Moon and the first manned mission to Mars in the 80's. Nuclear space power and propulsion played an important role in these entire future scenarios, hence ambitious development programmes were undertaken to make these technologies available. Unfortunately the 70's-paradigm shift in space policies did not only bring an end to the Apollo programme, but it also brought a complete halt to all of these technology programmes and confined the human presence in space to a tiny bubble including nothing more than the Earth's sphere and a mere shell of a few hundred kilometres of altitude, too small to even include the Moon. Today, after more than three decades, manned exploration of the Solar System has become an issue again and so are missions to Moon and Mars. However, studies and analyses show that all of these future plans are hampered by today's available propulsion systems and by the problematic of solar power generation at distances at and beyond of Mars, a problem, however, that can readily be solved by the utilisation of space nuclear reactors and propulsion systems. This paper intends to provide an overview on the various fission- and fusion-based Nuclear Power and Propulsion system concepts and tries to compare these systems' different working principles and technical implementations with each other. The overview and comparison will be complemented by a closer look at ongoing activities related to research and development in this area and by an outlook on what kind of systems might be employed to carry the first astronauts to Mars and beyond. (autho0008.

  10. Solar System Constraints on f(G) Dark Energy

    E-Print Network [OSTI]

    Stephen C. Davis

    2008-01-30T23:59:59.000Z

    Corrections to solar system gravity are derived for f(G) gravity theories, in which a function of the Gauss-Bonnet curvature term is added to the gravitational action. Their effects on Newton's law, as felt by the planets, and on the frequency shift of signals from the Cassini spacecraft, are both determined. Despite the fact that the Gauss-Bonnet term is quadratic in curvature, the resulting constraints are substantial. It is shown that they practically rule out f(G) as a natural explanation for the late-time acceleration of the universe. Possible exceptions are when f(G) reduces to something very close to a cosmological constant, or if the form of the function f is exceptionally fine-tuned.

  11. Solar system effects in Schwarzschild--de Sitter spacetime

    E-Print Network [OSTI]

    Valeria Kagramanova; Jutta Kunz; Claus Lämmerzahl

    2006-03-18T23:59:59.000Z

    The Schwarzschild--de Sitter space--time describes the gravitational field of a spherically symmetric mass in a universe with cosmological constant $\\Lambda$. Based on this space--time we calculate Solar system effects like gravitational redshift, light deflection, gravitational time delay, Perihelion shift, geodetic or de Sitter precession, as well as the influence of $\\Lambda$ on a Doppler measurement, used to determine the velocity of the Pioneer 10 and 11 spacecraft. For $\\Lambda=\\Lambda_0 \\sim 10^{-52} {\\rm m}^{-2}$ the cosmological constant plays no role for all of these effects, while a value of $\\Lambda \\sim - 10^{-37} {\\rm m}^{-2}$, if hypothetically held responsible for the Pioneer anomaly, is not compatible with the Perihelion shift.

  12. Tests of Modified Gravity Theories in the Solar System

    E-Print Network [OSTI]

    Ali Mozaffari

    2014-04-01T23:59:59.000Z

    We review the case for testing preferred acceleration scale theories of gravity (sometimes falling under the guise of MOdified Newtonian Dynamics) in the Solar System using the forthcoming LISA Pathfinder (LPF) mission. Using a combination of analytical and numerical results, we suggest that different types of theory should be detectable using the predicted anomalous tidal stresses effects around the saddle points of the Newtonian gravitational field. The saddle point bubbles expected extent of $\\sim 400$ km are to be contrasted with potential miss parameters of $\\leq 10$ km, making such a test in easy reach of LPF. We also consider routes to constraining our theories from data, based on scenarios of both null and positive results.

  13. Solar Resource & Meteorological Assessment Project (SOLRMAP): Observed Atmospheric and Solar Information System (OASIS); Tucson, Arizona (Data)

    SciTech Connect (OSTI)

    Wilcox, S.; Andreas, A.

    2010-11-03T23:59:59.000Z

    The U.S. Department of Energy's National Renewable Energy Laboratory collaborates with the solar industry to establish high quality solar and meteorological measurements. This Solar Resource and Meteorological Assessment Project (SOLRMAP) provides high quality measurements to support deployment of power projects in the United States. The no-funds-exchanged collaboration brings NREL solar resource assessment expertise together with industry needs for measurements. The end result is high quality data sets to support the financing, design, and monitoring of large scale solar power projects for industry in addition to research-quality data for NREL model development. NREL provides consultation for instrumentation and station deployment, along with instrument calibrations, data acquisition, quality assessment, data distribution, and summary reports. Industry participants provide equipment, infrastructure, and station maintenance.

  14. Solar Resource & Meteorological Assessment Project (SOLRMAP): Observed Atmospheric and Solar Information System (OASIS); Tucson, Arizona (Data)

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Wilcox, S.; Andreas, A.

    The U.S. Department of Energy's National Renewable Energy Laboratory collaborates with the solar industry to establish high quality solar and meteorological measurements. This Solar Resource and Meteorological Assessment Project (SOLRMAP) provides high quality measurements to support deployment of power projects in the United States. The no-funds-exchanged collaboration brings NREL solar resource assessment expertise together with industry needs for measurements. The end result is high quality data sets to support the financing, design, and monitoring of large scale solar power projects for industry in addition to research-quality data for NREL model development. NREL provides consultation for instrumentation and station deployment, along with instrument calibrations, data acquisition, quality assessment, data distribution, and summary reports. Industry participants provide equipment, infrastructure, and station maintenance.

  15. Clementine Observations of the Zodiacal Light and the Dust Content of the Inner Solar System

    E-Print Network [OSTI]

    Hahn, Joseph M.

    Clementine Observations of the Zodiacal Light and the Dust Content of the Inner Solar System Joseph Road 1, Houston, TX 77058 Bonnie Cooper Oceaneering Space Systems, 16665 Space Center Boulevard solar radii to the orbit of Venus. The averaged ecliptic surface brightness of the zodiacal light falls

  16. Experimental Research on Solar Assisted Heat Pump Heating System with Latent Heat Storage 

    E-Print Network [OSTI]

    Han, Z.; Zheng, M.; Liu, W.; Wang, F.

    2006-01-01T23:59:59.000Z

    Assisted Heat Pump Heating System with Latent Heat Storage. In this system, solar energy is the major heat source for a heat pump, and the supplementary heat source is soil. The disagreement in time between the space heat load and heat collected by solar...

  17. Study of Applications of Solar Heating Systems with Seasonal Storage in China 

    E-Print Network [OSTI]

    Yu, G.; Zhao, X.; Chen, P.

    2006-01-01T23:59:59.000Z

    In most northern parts of China, it is cold in winter and needs space heating in winter. This paper studies applications of solar heating systems with seasonal storage in China. A typical residential district was selected, and a solar heating system...

  18. Quality assurance of solar thermal systems with the ISFH-Input/Output-Procedure

    E-Print Network [OSTI]

    Quality assurance of solar thermal systems with the ISFH- Input/Output-Procedure Peter Paerisch different solar systems. The simulation model was validated with measured data. The deviation between meas * Tel. +49 (0)5151-999503, Fax: +49 (0)5151-999500, Email: paerisch@isfh.de Abstract Input/Output

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

    E-Print Network [OSTI]

    California at Berkeley, University of

    A Better Steam Engine: Designing a Distributed Concentrating Solar Combined Heat and Power System Callaway Spring 2011 #12;Abstract A Better Steam Engine: Designing a Distributed Concentrating Solar a leading choice for DCS-CHP systems, if operation on steam is successful and reliability issues can

  20. Solar Water Splitting: Photocatalyst Materials Discovery and Systems Development

    SciTech Connect (OSTI)

    McNulty, Thomas F.

    2008-05-02T23:59:59.000Z

    Hydrogen promises to be an attractive transportation fuel in the post-fossil fuel era. Relatively abundant and clean burning (water being the principal byproduct), hydrogen offers the potential to significantly reduce greenhouse gas emissions. However, there are significant technical barriers that require solutions before hydrogen can be implemented in large scale. These are: · Sources (e.g. hydrocarbon, water) · Transportation · Storage Each of the aforementioned barriers carries with it important considerations. First, would a hydrocarbon-based hydrogen source be of any benefit compared to conventional fossil fuels? Second, will a system based on centralized generation and distribution be viable? Finally, methods of on-board storage, whether they are liquefaction, adsorption, or intercalation, are far from optimized. The scope of this program is limited to hydrogen generation, specifically generation using solarinitiated water electrolysis. Though concept of making hydrogen using water and sunlight may sound somewhat far-fetched, in reality the concept is very real. Since the discovery of solar-generated hydrogen, termed photoelectrochemical hydrogen, nearly 30 years ago by Fujishima and Honda, significant advances in both fundamental understanding and technological capability have been made. Using solar radiation to generate hydrogen in a fashion akin to using solar to generate electricity offers many advantages. First, hydrogen can be generated at the point of use, reducing the importance of transportation. Second, using water as the hydrogen source eliminates greenhouse gas evolution and the consequences that come with it. Finally, because the process uses very little electricity (pumps and compressors predominantly), the quantity of chemical fuel produced far exceeds the amount of electricity consumed. Consequently, there is some level of truth to the notion that photoelectrochemically-derived hydrogen offers the potential to nearly eliminate greenhouse gas emissions from the transportation landscape. This report focuses primarily on the technical issues inherent to developing an economically viable photoelectrochemical hydrogen system. This involves research intended to address technology gaps as well as research to address commercial feasibility. Though a firm cost target is not identified explicitly, much of the economics are presented in terms of “dollars per gallon of gasoline equivalent” ($/gge). Obviously this is a moving target, but it is important to understand cost in terms of current gasoline pricing, since the intended target is gasoline replacement. However, this does put the cost contribution into a perspective that at least allows for a reasonable assessment of technological viability. It also allows for the identification of need areas beyond the obvious technology gaps.

  1. Development of a solar receiver for a high-efficiency thermionic/thermoelectric conversion system

    SciTech Connect (OSTI)

    Naito, H.; Kohsaka, Y.; Cooke, D.; Arashi, H. [Tohoku Univ., Aramaki (Japan)] [Tohoku Univ., Aramaki (Japan)

    1996-10-01T23:59:59.000Z

    Solar energy is one of the most promising energy resources on Earth and in space, because it is clean and inexhaustible. Therefore, we have been developing a solar-powered high-efficiency thermionic-thermoelectric conversion system which combines a thermionic converter (TIC) with a thermoelectric converter (TEC) to use thermal energy efficiently and to achieve high efficiency conversion. The TIC emitter must uniformly heat up to 1800 K. The TIC emitter can be heated using thermal radiation from a solar receiver maintained at a high temperature by concentrated solar irradiation. A cylindrical cavity-type solar receiver constructed from graphite was designed and heated in a vacuum by using the solar concentrator at Tohoku University. The maximum temperature of the solar receiver enclosed by a molybdenum cup reached 1965 K, which was sufficiently high to heat a TIC emitter using thermal radiation from the receiver. 4 refs., 6 figs., 1 tab.

  2. Installation guidelines for Solar Heating System, single-family residence at New Castle, Pennsylvania

    SciTech Connect (OSTI)

    Not Available

    1980-01-01T23:59:59.000Z

    The Solar Heating System installer guidelines are provided for each subsystem and includes testing and filling the system. This single-family residential heating system is a solar-assisted, hydronic-to-warm-air system with solar-assisted domestic water heating. It is composed of the following major components: liquid cooled flat plate collectors; water storage tank; passive solar-fired domestic water preheater; electric hot water heater; heat pump with electric backup; solar hot water coil unit; tube-and-shell heat exchanger, three pumps, and associated pipes and valving in an energy transport module; control system; and air-cooled heat purge unit. Information is also provided on the operating procedures, controls, caution requirements, and routine and schedule maintenance. Information consists of written procedures, schematics, detail drawings, pictures and manufacturer's component data.

  3. Evaluating the Impact of Solar Generation on Balancing Requirements in Southern Nevada System

    SciTech Connect (OSTI)

    Ma, Jian; Lu, Shuai; Etingov, Pavel V.; Makarov, Yuri V.

    2012-07-26T23:59:59.000Z

    Abstract—In this paper, the impacts of solar photovoltaic (PV) generation on balancing requirements including regulation and load following in the Southern Nevada balancing area are analyzed. The methodology is based on the “swinging door” algorithm and a probability box method developed by PNNL. The regulation and load following signals are mimicking the system’s scheduling and real-time dispatch processes. Load, solar PV generation and distributed PV generation (DG) data are used in the simulation. Different levels of solar PV generation and DG penetration profiles are used in the study. Sensitivity of the regulation requirements with respect to real-time solar PV generation forecast errors is analyzed.

  4. Evaluation of solar radiation measurement systems: EPRI/NREL final test report. Volume 1

    SciTech Connect (OSTI)

    Stoffel, T.; Riordan, C.; Bigger, J.

    1992-11-01T23:59:59.000Z

    Measured solar radiation resource data are needed by electric utilities to evaluate the potential of renewable energy options like photovoltaics in their service territory. In this final test report, we document a cooperative project of the Electric Power Research Institute (EPRI) and the National Renewable Energy Laboratory (NREL) to compare available measurement system options for performing solar radiation resource assessments. We present the detailed results of a 6-month field comparison of thermopile-based pyranometer and pyrheliometer solar irradiance measurement systems with two different implementations of the rotating shadowband radiometer (RSR) concept installed at NREL`s Solar Radiation Research Laboratory (SRRL) in Golden, Colorado.

  5. Integrating Solar Thermal and Photovoltaic Systems in Whole Building Energy Simulation

    E-Print Network [OSTI]

    Cho, S.; Haberl, J.

    to achieve further energy consumption reductions. To accomplish this, the F- Chart program was used for the solar thermal system analysis and the PV F-Chart program for the solar photovoltaic (PV) system analysis. Authors show how DOE-2.1e simulation... Time series plots of space heating and service hot water loads from SYSTEMS and PLANT simulation runs Due to the fact that the solar thermal systems analysis program, F-Chart, takes into account the system efficiencies in its loads calculation...

  6. Assembly and comparison of available solar hot water system reliability databases and information.

    SciTech Connect (OSTI)

    Menicucci, David F. (Building Specialists, Inc., Albuquerque, NM)

    2009-05-01T23:59:59.000Z

    Solar hot water (SHW) systems have been installed commercially for over 30 years, yet few quantitative details are known about their reliability. This report describes a comprehensive analysis of all of the known major previous research and data regarding the reliability of SHW systems and components. Some important conclusions emerged. First, based on a detailed inspection of ten-year-old systems in Florida, about half of active systems can be expected to fail within a ten-year period. Second, valves were identified as the probable cause of a majority of active SHW failures. Third, passive integral and thermosiphon SHW systems have much lower failure rates than active ones, probably due to their simple design that employs few mechanical parts. Fourth, it is probable that the existing data about reliability do not reveal the full extent of fielded system failures because most of the data were based on trouble calls. Often an SHW system owner is not aware of a failure because the backup system silently continues to produce hot water. Thus, a repair event may not be generated in a timely manner, if at all. This final report for the project provides all of the pertinent details about this study, including the source of the data, the techniques to assure their quality before analysis, the organization of the data into perhaps the most comprehensive reliability database in existence, a detailed statistical analysis, and a list of recommendations for additional critical work. Important recommendations include the inclusion of an alarm on SHW systems to identify a failed system, the need for a scientifically designed study to collect high-quality reliability data that will lead to design improvements and lower costs, and accelerated testing of components that are identified as highly problematic.

  7. Solar energy system performance evaluation: seasonal report for IBM System IA, Huntsville, Alabama

    SciTech Connect (OSTI)

    Not Available

    1980-05-01T23:59:59.000Z

    The analysis used is based on instrumented system data monitored and collected for at least one full season of operation. The long-term field performance of the installed system is reported. The Solar Energy System, Sims Prototype System 1A, was designed by IBM to provide 50 to 60% of the space heating and domestic hot water (DHW) preheating load to a 2000 square foot floor space single faily residence in the Huntsville area. The load design temperature inside the building was to be maintained at 70 degrees fahrenheit with auxiliary energy for heating supplied by an electric heat pump assisted by an electric resistance strip heater. Auxiliary energy for domestic hot water is from a conventional 20-gallon DHW storage tank. The solar energy system, uses air as the heat transport medium, has a 720 square foot Solar Energy Products Collector Array, a 22-ton rock storage located within the office building, a pump, heat exchanger, air handler, pre-heat tank, fan and associated plumbing. The system has five different modes of operation.

  8. EVIDENCE FOR THE IMPACT OF STELLAR ACTIVITY ON THE DETECTABILITY OF SOLAR-LIKE OSCILLATIONS OBSERVED BY KEPLER

    SciTech Connect (OSTI)

    Chaplin, W. J.; Broomhall, A.-M.; Hekker, S.; Elsworth, Y.; Stevens, I. R. [School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT (United Kingdom); Bedding, T. R.; Huber, D. [Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006 (Australia); Bonanno, A. [INAF Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123, Catania (Italy); GarcIa, R. A. [Laboratoire AIM, CEA/DSM, CNRS, Universite Paris Diderot, IRFU/SAp, 91191 Gif-sur-Yvette Cedex (France); Verner, G. A. [Astronomy Unit, Queen Mary, University of London, Mile End Road, London, E1 4NS (United Kingdom); Basu, S. [Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States); Houdek, G. [Institute of Astronomy, University of Vienna, A-1180 Vienna (Austria); Mathur, S.; Metcalfe, T. S. [High Altitude Observatory and, Scientific Computing Division, National Center for Atmospheric Research, Boulder, Colorado 80307 (United States); Mosser, B. [LESIA, CNRS, Universite Pierre et Marie Curie, Universite Denis Diderot, Observatoire de Paris, 92195 Meudon Cedex (France); New, R. [Materials Engineering Research Institute, Faculty of Arts, Computing, Engineering and Sciences, Sheffield Hallam University, Sheffield, S1 1WB (United Kingdom); Appourchaux, T. [Institut d'Astrophysique Spatiale, Universite Paris XI, CNRS (UMR8617), Batiment 121, 91405 Orsay Cedex (France); Karoff, C. [Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark); Molenda-Zakowicz, J. [Astronomical Institute, University of Wroclaw, ul. Kopernika, 11, 51-622 Wroclaw (Poland); Monteiro, M. J. P. F. G. [Centro de Astrofisica and Faculdade de Ciencias, Universidade do Porto, Rua das Estrelas, 4150-762 (Portugal)

    2011-05-01T23:59:59.000Z

    We use photometric observations of solar-type stars, made by the NASA Kepler Mission, to conduct a statistical study of the impact of stellar surface activity on the detectability of solar-like oscillations. We find that the number of stars with detected oscillations falls significantly with increasing levels of activity. The results present strong evidence for the impact of magnetic activity on the properties of near-surface convection in the stars, which appears to inhibit the amplitudes of the stochastically excited, intrinsically damped solar-like oscillations.

  9. Combined Operation of Solar Energy Source Heat Pump, Low-vale Electricity and Floor Radiant System 

    E-Print Network [OSTI]

    Liu, G.; Guo, Z.; Hu, S.

    2006-01-01T23:59:59.000Z

    solar energy, low-vale electricity as heat sources in a floor radiant system are analyzed. This paper presents a new heat pump system and discusses its operational modes in winter....

  10. Combined Operation of Solar Energy Source Heat Pump, Low-vale Electricity and Floor Radiant System

    E-Print Network [OSTI]

    Liu, G.; Guo, Z.; Hu, S.

    2006-01-01T23:59:59.000Z

    solar energy, low-vale electricity as heat sources in a floor radiant system are analyzed. This paper presents a new heat pump system and discusses its operational modes in winter....

  11. 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 ...

  12. Advancing State-of-the-Art Concentrating Solar Power Systems...

    Energy Savers [EERE]

    to American Industry, Universities Washington: When Life Gives You Solar, Make Syngas Energy Department Announces New University-Led Projects to Create More Efficient,...

  13. SIMULATION OF A SOLAR ABSORPTION COOLING SYSTEM J.P. Praene*, D. Morau, F. Lucas, F. Garde, H. Boyer

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    (collector area, tank volume...) on chiller performance. Keywords: solar collectors, solar refrigerators of solar evacuated tube collectors. The Ninth IBPSA Conference and Exhibition, 2005; Simulation and optimization of a solar absorption cooling system using evacuated tube collectors. CLIMA 2007, 2007; Steady

  14. Quality assurance with the ISFH-Input/Output-Procedure 6-year-experience with 14 solar thermal systems

    E-Print Network [OSTI]

    Quality assurance with the ISFH-Input/Output-Procedure 6-year-experience with 14 solar thermal the confidence in solar thermal energy. The so called Input/Output-Procedure is controlling the solar heat systems. The simulation model was validated with measured data and a lot of failures in 11 solar thermal

  15. On the station keeping of a Solar sail in the Elliptic Sun-Earth system

    E-Print Network [OSTI]

    Barcelona, Universitat de

    On the station keeping of a Solar sail in the Elliptic Sun-Earth system Ariadna Farr´es and `Angel on the dynamics of a Solar sail in the Sun- Earth Elliptic Restricted Three-Body Problem with Solar radiation that the sail is perpendicular to the Sun-sail line, we find an equilibrium point in the Earth-Sun line closer

  16. ELEG620: Solar Electric Systems University of Delaware Spring 2008 1 University of Delaware

    E-Print Network [OSTI]

    Honsberg, Christiana

    Department of Electrical and Computer Engineering ELEG620: Solar Electric Systems Photovoltaic System Design-alone photovoltaic system. Working in groups, you will: · Decide on a load and design goal for your system; · Write system is to determine the type and size of the system. You are given substantial latitude in choosing

  17. Concentrating Solar Deployment System (CSDS) -- A New Model for Estimating U.S. Concentrating Solar Power (CSP) Market Potential: Preprint

    SciTech Connect (OSTI)

    Blair, N.; Mehos, M.; Short, W.; Heimiller, D.

    2006-04-01T23:59:59.000Z

    This paper presents the Concentrating Solar Deployment System Model (CSDS). CSDS is a multiregional, multitime-period, Geographic Information System (GIS), and linear programming model of capacity expansion in the electric sector of the United States. CSDS is designed to address the principal market and policy issues related to the penetration of concentrating solar power (CSP) electric-sector technologies. This paper discusses the current structure, capabilities, and assumptions of the model. Additionally, results are presented for the impact of continued research and development (R&D) spending, an extension to the investment tax credit (ITC), and use of a production tax credit (PTC). CSDS is an extension of the Wind Deployment System (WinDS) model created at the National Renewable Energy Laboratory (NREL). While WinDS examines issues related to wind, CSDS is an extension to analyze similar issues for CSP applications. Specifically, a detailed representation of parabolic trough systems with thermal storage has been developed within the existing structure.

  18. Modelling the effects of solar activity onto the Greek national electric grid

    E-Print Network [OSTI]

    Zois, Ioannis P

    2013-01-01T23:59:59.000Z

    We study both the short term and long term effects of solar activity on the large transformers (150kV and 400kV) of the Greek national electric grid. We use data analysis and various analytic and statistical methods and models. Contrary to the common belief in PPC Greece, we see that there are considerable both short term (immediate) and long term effects of solar activity onto large transformers in a mid-latitude country like Greece. Our results can be summarized as follows: For the short term effects: During 1989-2010 there were 43 stormy days (namely days with for example Ap larger or equal to 100) and we had 19 failures occurring during a stormy day plus or minus 3 days and 51 failures occurring during a stormy day plus or minus 7 days. All these failures can be directly related to Geomagnetically Induced Currents (GICs). Explicit cases are presented. For the long term effects we have two main results: The maximum number of transformer failures occur 3-4 years after the maximum of solar activity. There is...

  19. MAGNETIC NONPOTENTIALITY IN PHOTOSPHERIC ACTIVE REGIONS AS A PREDICTOR OF SOLAR FLARES

    SciTech Connect (OSTI)

    Yang Xiao; Lin Ganghua; Zhang Hongqi; Mao Xinjie, E-mail: yangx@nao.cas.cn [Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012 (China)

    2013-09-10T23:59:59.000Z

    Based on several magnetic nonpotentiality parameters obtained from the vector photospheric active region magnetograms obtained with the Solar Magnetic Field Telescope at the Huairou Solar Observing Station over two solar cycles, a machine learning model has been constructed to predict the occurrence of flares in the corresponding active region within a certain time window. The Support Vector Classifier, a widely used general classifier, is applied to build and test the prediction models. Several classical verification measures are adopted to assess the quality of the predictions. We investigate different flare levels within various time windows, and thus it is possible to estimate the rough classes and erupting times of flares for particular active regions. Several combinations of predictors have been tested in the experiments. The True Skill Statistics are higher than 0.36 in 97% of cases and the Heidke Skill Scores range from 0.23 to 0.48. The predictors derived from longitudinal magnetic fields do perform well, however, they are less sensitive in predicting large flares. Employing the nonpotentiality predictors from vector fields improves the performance of predicting large flares of magnitude {>=}M5.0 and {>=}X1.0.

  20. UBC Social Ecological Economic Development Studies (SEEDS) Student Report An Investigation Into Renewable Energy: The Solar Canopy Illumination System

    E-Print Network [OSTI]

    Into Renewable Energy: The Solar Canopy Illumination System Samuel Davies, Patrick Duvall, Timothy Russell Investigation Into Renewable Energy: The Solar Canopy Illumination System Samuel Davies Patrick Duvall Timothy of a building's energy usage, the solar canopy system is ideal for facilities, such as the new student union

  1. Temporal and energy behavior of cosmic ray fluxes in the periods of low solar activity

    E-Print Network [OSTI]

    Bazilevskaya, G A; Krainev, M B; Makhmutov, V S; Svirzhevskaya, A K; Svirzhevsky, N S

    2014-01-01T23:59:59.000Z

    Modulation of galactic cosmic ray intensity is governed by several mechanisms including diffusion, convection, adiabatic energy losses and drift. Relative roles of these factors change in the course of an 11-year solar cycle. That can result in the changes in the energy dependence of the 11-year cosmic ray modulation. The minimum between the solar cycles 23 and 24 was extremely deep and long-lasting which led to the record high cosmic ray fluxes low-energy particles dominating. This was a signature of unusually soft energy spectrum of the cosmic rays. In this work we examine the energy dependence of the 11-year modulation during the last three solar cycles and argue that a soft energy spectrum was observed in the minimum of each cycle however only for particles below of energy around 10 GeV. From mid 1980s the energy dependence of cosmic rays became softer from minimum to minimum of solar activity. The work is based on the cosmic ray data of the spacecraft, balloon-borne and the ground-based observations.

  2. Strongly Correlated Electron Systems Functionalized for Solar Cells and Memristors

    E-Print Network [OSTI]

    " #12;Grand Energy Challenge Gap between production and demand: ~14TW by 2050 Install one 1GW new power Demand total industrial developing US ee/fsu Energy source World Capacity Solar Geothermal Biomass Hydro Optimization of gap: max efficiency: 31% (Shockley Queisser 1961) In real PV cells 80-85% of incident solar

  3. Critical issues in the development of hybrid solar/gas receivers for dish/Stirling systems

    SciTech Connect (OSTI)

    Adkins, D.R.; Rawlinson, K.S.

    1991-01-01T23:59:59.000Z

    A hybrid solar/gas receiver system will allow Stirling engines to operate with combined solar and gas power sources. One of the most attractive options for building a hybrid system is to integrate a gas-fired heat pipe directly into a heat-pipe solar receiver. Before this union can take place, however, a number of technical issues must be resolved. A design must be found that properly distributes the heat-pipe's working fluid over the heated surfaces and prevents fluid from accumulating at undesirable locations in the heat pipe. Experience that has been gained in developing solar receivers and gas-fired heat pipes under recent Department of Energy solar-thermal dish-electric programs is used in this paper to address many of the technical obstacles to building receiver systems. 16 refs.

  4. Solar heating and hot water system installed at St. Louis, Missouri. Final report

    SciTech Connect (OSTI)

    Not Available

    1980-04-01T23:59:59.000Z

    Information is provided on the solar heating and hot water system installed at the William Tao and Associates, Inc., office building in St. Louis, Missouri. The information consists of description, photos, maintenance and construction problems, final drawing, system requirements and manufacturer's component data. The solar system was designed to provide 50% of the hot water requirements and 45% of the space heating needs for a 900 square foot office space and drafting room. The solar facility has 252 square foot of glass tube concentrator collectors and a 1000 gallon steel storage tank buried below a concrete slab floor. Freeze protection is provided by a propylene glycol/water mixture in the collector loop. The collectors are roof mounted on a variable tilt array which is adjusted seasonally and is connected to the solar thermal storage tank by a tube-in-shell heat exchanger. Incoming city water is preheated through the solar energy thermal storage tank.

  5. Ring diagram analysis of the characteristics of solar oscillation modes in active regions

    E-Print Network [OSTI]

    S. P. Rajaguru; Sarbani Basu; H. M. Antia

    2001-08-14T23:59:59.000Z

    The presence of intense magnetic fields in and around sunspots is expected to modify the solar structure and oscillation frequencies. Applying the ring diagram technique to data from the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory (SOHO), we analyze the characteristics of high-degree f and p modes near active regions and compare them with the characteristics of the modes in quiet regions. As expected from earlier results, the f- and p-mode frequencies of high degree modes are found to be significantly larger in magnetically active regions. In addition, we find that the power in both f and p modes is lower in active regions, while the widths of the peaks are larger, indicating smaller lifetimes. We also find that the oscillation modes are more asymmetric in active regions than those in quiet regions, indicating that modes in active regions are excited closer to the surface. While the increase in mode frequency is monotonic in frequency, all other characteristics show more complex frequency dependences.

  6. Formation of the first oxidized iron in the solar system Lawrence GROSSMAN1,2

    E-Print Network [OSTI]

    Grossman, Lawrence

    , amounting to several hundred times the water content of a high-temperature gas of solar composition of the planetesimals and/or in hot, dense, water-rich vapor plumes generated by impacts on them. This would imply the first solid form of FeO appeared in the solar system. HIGH-TEMPERATURE CONDENSATION OF FEO

  7. Study of Applications of Solar Heating Systems with Seasonal Storage in China

    E-Print Network [OSTI]

    Yu, G.; Zhao, X.; Chen, P.

    2006-01-01T23:59:59.000Z

    the ratio of volume of seasonal storage tank to collector areas is 3~5, the system performance is optimal for many places in China; 3) the obtained solar heat is mainly dependent on the solar irradiance, length of heating period and ambient temperature...

  8. Volatile fractionation in the early solar system and chondrule matrix complementarity

    E-Print Network [OSTI]

    Demouchy, Sylvie

    Volatile fractionation in the early solar system and chondrule matrix complementarity Philip A and Astromaterials Research Centre, Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD. Although volatile depletion was the most fundamental chemical process affecting the inner solar nebula

  9. 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)

  10. Lithium abundance/surface activity connections in solar-type Pleiads

    E-Print Network [OSTI]

    D. Clarke; E. C. MacDonald; S. Owens

    2003-12-03T23:59:59.000Z

    The relation between the lithium abundance, A_Li, and photospheric activity of solar-type Pleiads is investigated for the first time via acquisition and analysis of B and V-band data. Predictions of activity levels of target stars were made according to the A_Li/(B-V) relation and then compared with new CCD photometric measurements. Six sources behaved according to the predictions while one star (HII 676), with low predicted activity, exhibited the largest variability of the study; another star (HII 3197), with high predicted activity, was surprisingly quiet. Two stars displayed non-periodic fadings, this being symptomatic of orbiting disk-like structures with irregular density distributions. Although the observation windows were not ideal for rotational period detection, some periodograms provided possible values; the light-curve obtained for HII 1532 is consistent with that previously recorded.

  11. Solar system tests of Ho?ava-Lifshitz gravity

    E-Print Network [OSTI]

    Tiberiu Harko; Zoltan Kovács; Francisco S. N. Lobo

    2010-10-28T23:59:59.000Z

    Recently, a renormalizable gravity theory with higher spatial derivatives in four dimensions was proposed by Ho\\v{r}ava. The theory reduces to Einstein gravity with a non-vanishing cosmological constant in IR, but it has improved UV behaviors. The spherically symmetric black hole solutions for an arbitrary cosmological constant, which represent the generalization of the standard Schwarzschild-(A)dS solution, has also been obtained for the Ho\\v{r}ava-Lifshitz theory. The exact asymptotically flat Schwarzschild type solution of the gravitational field equations in Ho\\v{r}ava gravity contains a quadratic increasing term, as well as the square root of a fourth order polynomial in the radial coordinate, and it depends on one arbitrary integration constant. The IR modified Ho\\v{r}ava gravity seems to be consistent with the current observational data, but in order to test its viability more observational constraints are necessary. In the present paper we consider the possibility of observationally testing Ho\\v{r}ava gravity at the scale of the Solar System, by considering the classical tests of general relativity (perihelion precession of the planet Mercury, deflection of light by the Sun and the radar echo delay) for the spherically symmetric black hole solution of Ho\\v{r}ava-Lifshitz gravity. All these gravitational effects can be fully explained in the framework of the vacuum solution of the gravity. Moreover, the study of the classical general relativistic tests also constrain the free parameter of the solution.

  12. Solar energy system performance evaluation - final report for Honeywell OTS 45, Salt River Project, Phoenix, Arizona

    SciTech Connect (OSTI)

    Mathur, A K

    1983-09-01T23:59:59.000Z

    This report describes the operation and technical performance of the Solar Operational Test Site (OTS 45) at Salt River Project in Phoenix, Arizona, based on the analysis of data collected between April 1981 and March 31, 1982. The following topics are discussed: system description, performance assessment, operating energy, energy savings, system maintenance, and conclusions. The solar energy system at OTS 45 is a hydronic heating and cooling system consisting of 8208 square feet of liquid-cooled flat-plate collectors; a 2500-gallon thermal storage tank; two 25-ton capacity organic Rankine-cycle-engine-assisted water chillers; a forced-draft cooling tower; and associated piping, pumps, valves, controls and heat rejection equipment. The solar system has eight basic modes of operation and several combination modes. The system operation is controlled automatically by a Honeywell-designed microprocessor-based control system, which also provides diagnostics. Based on the instrumented test data monitored and collected during the 8 months of the Operational Test Period, the solar system collected 1143 MMBtu of thermal energy of the total incident solar energy of 3440 MMBtu and provided 241 MMBtu for cooling and 64 MMBtu for heating. The projected net annual electrical energy savings due to the solar system was approximately 40,000 kWh(e).

  13. Monitoring solar-thermal systems: An outline of methods and procedures

    SciTech Connect (OSTI)

    Rosenthal, A. [New Mexico State Univ., Las Cruces, NM (United States). Southwest Technology Development Inst.

    1994-04-01T23:59:59.000Z

    This manual discusses the technical issues associated with monitoring solar-thermal systems. It discusses some successful monitoring programs that have been implemented in the past. It gives the rationale for selecting a program of monitoring and gives guidelines for the design of new programs. In this report, solar thermal monitoring systems are classified into three levels. For each level, the report discusses the kinds of information obtained by monitoring, the effort needed to support the monitoring program, the hardware required, and the costs involved. Ultimately, all monitoring programs share one common requirement: the collection of accurate data that characterize some aspect or aspects of the system under study. This report addresses most of the issues involved with monitoring solar thermal systems. It does not address such topics as design fundamentals of thermal systems or the relative merits of the many different technologies employed for collection of solar energy.

  14. Solar hot water system installed at Quality Inn, Key West, Florida. Final report

    SciTech Connect (OSTI)

    Not Available

    1980-04-01T23:59:59.000Z

    The solar energy hot water system installed in the Quality Inn, Key West, Florida, which consists of four buildings, is described. Three buildings are low-rise, two-story buildings containing 100 rooms. The fourth is a four-story building with 48 rooms. The solar system was designed to provide approximately 50% of the energy required for the domestic hot water system. The solar system consists of approximately 1400 ft/sup 2/ of flat plate collector, two 500 gal storage tanks, a circulating pump, and a controller. Operation of the system was begun in April 1978, and has continued to date with only three minor interruptions for pump repair. In the first year of operation, it was determined that the use of the solar facility resulted in 40% fuel savings.

  15. Sandia Energy - Solar Energy Grid Integration Systems (SEGIS)

    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 Office of ScienceandMesa del Sol Home Distribution GridDocumentsInstitute ofSiting and BarrierSolarSolarSolar

  16. 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],

  17. Terrestrial Planet Formation in Extra-Solar Planetary Systems

    E-Print Network [OSTI]

    Sean N. Raymond

    2008-01-16T23:59:59.000Z

    Terrestrial planets form in a series of dynamical steps from the solid component of circumstellar disks. First, km-sized planetesimals form likely via a combination of sticky collisions, turbulent concentration of solids, and gravitational collapse from micron-sized dust grains in the thin disk midplane. Second, planetesimals coalesce to form Moon- to Mars-sized protoplanets, also called "planetary embryos". Finally, full-sized terrestrial planets accrete from protoplanets and planetesimals. This final stage of accretion lasts about 10-100 Myr and is strongly affected by gravitational perturbations from any gas giant planets, which are constrained to form more quickly, during the 1-10 Myr lifetime of the gaseous component of the disk. It is during this final stage that the bulk compositions and volatile (e.g., water) contents of terrestrial planets are set, depending on their feeding zones and the amount of radial mixing that occurs. The main factors that influence terrestrial planet formation are the mass and surface density profile of the disk, and the perturbations from giant planets and binary companions if they exist. Simple accretion models predicts that low-mass stars should form small, dry planets in their habitable zones. The migration of a giant planet through a disk of rocky bodies does not completely impede terrestrial planet growth. Rather, "hot Jupiter" systems are likely to also contain exterior, very water-rich Earth-like planets, and also "hot Earths", very close-in rocky planets. Roughly one third of the known systems of extra-solar (giant) planets could allow a terrestrial planet to form in the habitable zone.

  18. INTERMITTENCY AND MULTIFRACTALITY SPECTRA OF THE MAGNETIC FIELD IN SOLAR ACTIVE REGIONS

    SciTech Connect (OSTI)

    Abramenko, Valentyna; Yurchyshyn, Vasyl [Big Bear Solar Observatory, 40386 North Shore Lane, Big Bear City, CA 92314 (United States)

    2010-10-10T23:59:59.000Z

    We present the results of a study of intermittency and multifractality of magnetic structures in solar active regions (ARs). Line-of-sight magnetograms for 214 ARs of different flare productivity observed at the center of the solar disk from 1997 January until 2006 December are utilized. Data from the Michelson Doppler Imager (MDI) instrument on board the Solar and Heliospheric Observatory operating in the high resolution mode, the Big Bear Solar Observatory digital magnetograph, and the Hinode SOT/SP instrument were used. Intermittency spectra were derived from high-order structure functions and flatness functions. The flatness function exponent is a measure of the degree of intermittency. We found that the flatness function exponent at scales below approximately 10 Mm is correlated with flare productivity (the correlation coefficient is -0.63). The Hinode data show that the intermittency regime is extended toward small scales (below 2 Mm) as compared to the MDI data. The spectra of multifractality, derived from the structure functions and flatness functions, are found to be broader for ARs of higher flare productivity as compared to those of low flare productivity. The magnetic structure of high-flaring ARs consists of a voluminous set of monofractals, and this set is much richer than that for low-flaring ARs. The results indicate the relevance of the multifractal organization of the photospheric magnetic fields to the flaring activity. The strong intermittency observed in complex and high-flaring ARs is a hint that we observe a photospheric imprint of enhanced sub-photospheric dynamics.

  19. Solar energy system performance evaluation: seasonal report for IBM System 3, Glendo, Wyoming

    SciTech Connect (OSTI)

    None

    1980-06-01T23:59:59.000Z

    The IBM System 3 Solar Energy System was designed by the Federal Systems Division of IBM in Huntsville, Alabama to provide 46% of the space heating and 80% of the domestic hot water (DHW) for a 1078 square foot retrofit of an existing building used as a residence at the Glendo Reservoir State Park Ranger Station. The system consists of fourteen Sunworks Model LA1001A flat plate liquid collectors (294 square feet), a 1000 gallon hot water storage tank, a 65 gallon electric domestic hot water tank, pumps, heat exchangers, controls, and associated plumbing. Water is the heat transfer medium for this closed volume, passive drain down system. A gas furnace is used for auxiliary space heating energy. The system which became operational in October 1978 has five modes of operation. Performance data for the year of 1979 are presented and assessed.

  20. Gainesville Regional Utilities- Solar-Electric (PV) System Rebate Program

    Broader source: Energy.gov [DOE]

    '''''NOTE: Application targets for fiscal year 2013 have been met for the GRU Solar PV Rebate Program. The next round of applications are scheduled to open on October 1, 2013 pending approval of...

  1. APPLICATION OF TURBOMACHINERY IN SOLAR-ASSISTED RANKINE COOLING SYSTEMS

    E-Print Network [OSTI]

    Leech, J.

    2010-01-01T23:59:59.000Z

    F. , jr. S. B. , S. M. Steam Turbines. Second Edition, Tenththe solar-assisted cycle. Steam turbines have been used forin Figure 5. Steam entering the turbine expends a portion of

  2. Reliability Evaluation of Electric Power Generation Systems with Solar Power

    E-Print Network [OSTI]

    Samadi, Saeed

    2013-11-08T23:59:59.000Z

    Conventional power generators are fueled by natural gas, steam, or water flow. These generators can respond to fluctuating load by varying the fuel input that is done by a valve control. Renewable power generators such as wind or solar, however...

  3. Multilevel Converter Topologies for Utility Scale Solar Photovoltaic Power Systems 

    E-Print Network [OSTI]

    Essakiappan, Somasundaram

    2014-04-30T23:59:59.000Z

    Renewable energy technologies have been growing in their installed capacity rapidly over the past few years. This growth in solar, wind and other technologies is fueled by state incentives, renewable energy mandates, ...

  4. APPLICATION OF TURBOMACHINERY IN SOLAR-ASSISTED RANKINE COOLING SYSTEMS

    E-Print Network [OSTI]

    Leech, J.

    2010-01-01T23:59:59.000Z

    F. , jr. S. B. , S. M. Steam Turbines. Second Edition, Tenththe solar-assisted cycle. Steam turbines have been used foras drag or terry turbines, in which the steam is directed

  5. Solar PV water pumping system for rural development in Nepal: Problems and prospects

    SciTech Connect (OSTI)

    Shrestha, J.N. [Inst. of Engineering, Kathmandu (Nepal). Dept. of Electronics Engineering

    1996-12-31T23:59:59.000Z

    Although PV water pumping systems have high initial costs, they require virtually no maintenance, require no fuel and thus save foreign exchange. They are easy to install and operate, have no moving parts and hence are highly reliable and durable and are modular in nature for future expansion, PV systems are found to be competitive with conventional diesel generator systems. Despite the above mentioned facts policy makers are still not convinced that solar PV water pumping systems can support rural development. This paper gives reasons for the failures of some solar PV water pumping projects in Nepal. Development of solar electricity totaling about 800 KWp in Nepal is briefly highlighted. Basic preconditions are identified for the successful operation of solar PV water pumping systems. The findings of successful solar PV water pumping systems are highlighted with specific reference to socio-economic impacts in the rural society. Subsidy policy of the government on solar PV water pumping systems is analyzed. Development of a spontaneous market for community solar PV water pumping system is analyzed. Suggestions are given on how solar PV water pumping system can be made more affordable by village people. Typical Nepalese rural areas are found to be suitable and economical for SPVWPS. Site evaluation procedure is given. Finally, the paper indicates the important of training for the local people in installation, operation and routine maintenance to ensure the reliability of the SPVWPS. The paper emphasizes the involvement of end-users from the very beginning of planning stage of SPVWPS. Detail comparison between a SPVWPS and an equivalent diesel generator is also indicated in the paper.

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

    E-Print Network [OSTI]

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

    2013-01-01T23:59:59.000Z

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

  7. Technical and Economic Analysis of Solar Cooling Systems in a Hot and Humid Climate

    E-Print Network [OSTI]

    Moaveni, H.

    The aim of this paper is to promote efficient and cost effective implementation of advanced solar cooling systems and techniques for the hot and humid climates cities in the United States. After an introduction of basic principles, the development...

  8. Investigation of a Novel Solar Assisted Water Heating System with Enhanced Energy Yield for Buildings

    E-Print Network [OSTI]

    Zhang, X.; Zhao, X.; Xu, J.; Yu, X.

    2012-01-01T23:59:59.000Z

    This paper presented the concept, prototype application, operational performance and benefits relating to a novel solar assisted water heating system for building services. It was undertaken through dedicated theoretical analysis, computer...

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

    E-Print Network [OSTI]

    O'Rourke, Conor R. (Conor Rakis)

    2011-01-01T23:59:59.000Z

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

  10. Solar Energy to Drive Absorption Cooling Systems Suitable for Small Building Applications 

    E-Print Network [OSTI]

    Gomri, R.

    2010-01-01T23:59:59.000Z

    results and an overview of the performance of low capacity single stage and half-effect absorption cooling systems, suitable for residential and small building applications. The primary heat source is solar energy supplied from flat plate collectors...

  11. A Modified Gravity and its Consequences for the Solar System, Astrophysics and Cosmology

    E-Print Network [OSTI]

    J. W. Moffat

    2006-12-17T23:59:59.000Z

    A relativistic modified gravity (MOG) theory leads to a self-consistent, stable gravity theory that can describe the solar system, galaxy and clusters of galaxies data and cosmology.

  12. Solar Energy to Drive Absorption Cooling Systems Suitable for Small Building Applications

    E-Print Network [OSTI]

    Gomri, R.

    2010-01-01T23:59:59.000Z

    results and an overview of the performance of low capacity single stage and half-effect absorption cooling systems, suitable for residential and small building applications. The primary heat source is solar energy supplied from flat plate collectors...

  13. Solar System Constraints on a Cosmologically Viable $f(R)$ Theory

    E-Print Network [OSTI]

    Yousef Bisabr

    2009-12-02T23:59:59.000Z

    Recently, a model $f(R)$ theory is proposed \\cite{recent} which is cosmologically viable and distinguishable from $\\Lambda$CDM. We use chameleon mechanism to investigate viability of the model in terms of Solar System experiments.

  14. Experimental Research on Solar Assisted Heat Pump Heating System with Latent Heat Storage

    E-Print Network [OSTI]

    Han, Z.; Zheng, M.; Liu, W.; Wang, F.

    2006-01-01T23:59:59.000Z

    Based on the status quo that conventional energy sources are more and more reduced and environmental pollution is increasingly serious, this paper presents a new model system of conserving energy and environmental protection, namely, a Solar...

  15. Spirasol : improvements to semi-continuous solar disinfection water treatment systems

    E-Print Network [OSTI]

    Loux, Brian Michael, 1981-

    2005-01-01T23:59:59.000Z

    An experimental study was carried out to determine the feasibility of an original point of use solar water disinfection system created by the author and named "Spirasol." The study primarily focused on the comparison of ...

  16. Unique abilities of hopper spacecraft to enable national objectives for solar system exploration

    E-Print Network [OSTI]

    Lanford, Ephraim Robert

    2011-01-01T23:59:59.000Z

    In comparison with conventional and other conceived approaches, hopper spacecraft offer unique advantages in exploring Solar System objects beyond Earth. The present work began with a survey - based on documents from the ...

  17. Design and implementation of a solar power system in rural Haiti

    E-Print Network [OSTI]

    Hussam, Shaheer M. (Shaheer Muqtasid), 1981-

    2004-01-01T23:59:59.000Z

    This paper describes the design and implementation of a solar power system for a school and health center in Petit-Anse, Haiti. The end-use applications are lighting via a set of fluorescent and incandescent bulbs, and a ...

  18. Optimal operation and design of solar-thermal energy storage systems

    E-Print Network [OSTI]

    Lizarraga-García, Enrique

    2012-01-01T23:59:59.000Z

    The present thesis focuses on the optimal operation and design of solar-thermal energy storage systems. First, optimization of time-variable operation to maximize revenue through selling and purchasing electricity to/from ...

  19. Dr. Mae Jemison is the principal for the 100 Year Starship Project, which envisions human travel beyond our solar system

    E-Print Network [OSTI]

    Collins, Gary S.

    , such as projects using satellite technology for healthcare delivery in West Africa and solar dish Stirling engines beyond our solar system to another star within the next 100 years. Her leadership and vision provide

  20. DFT-MD approach to TiO2/liquid interface systems for photocatalysis and dye-sensitised solar cell

    E-Print Network [OSTI]

    Katsumoto, Shingo

    DFT-MD approach to TiO2/liquid interface systems for photocatalysis and dye-sensitised solar cell- namics (MD) analysis of TiO2/solution in- terfaces related to photocatalysis and dye- sensitized solar

  1. Financing alternatives and incentives for solar-thermal central-receiver systems

    SciTech Connect (OSTI)

    Bos, P.B.

    1982-07-01T23:59:59.000Z

    As a result of various recently enacted incentive and regulatory legislation combined with the new administration policy and budgetary guidelines, the commercialization of solar thermal central receiver systems will involve financing alternatives other than conventional utility financing. This study was conducted to identify these potential financing alternatives and the associated requirements and impacts on the Department of Energy program. Based upon this analysis, it is concluded that the current alternative financing window is extremely short (through 1985), and that an extension or at the least a gradual phasing out, of the solar tax credits is necessary for the successful transfer of the central receiver technology to the private sector. Furthermore, throughout this time period, continued government support of the R and D activities is necessary to provide the necessary confidence in this technology for the private (financial) sector to underwrite this technology transfer. Consequently, even though the central receiver technology shows high promise for replacing a significant fraction of the oil/gas-fired utility industry peaking and intermediate generation, the current readiness status of this technology still requires further direct and indirect government support for a successful technology transfer. The direct government research and development support will provide the basis for a technological readiness and confidence, whereas the indirect tax incentive support serves to underwrite the extraordinary risks associated with the technology transfer. These support requirements need only be limited to and decreasing during this technology transfer phase, since as the systems approach successful full-scale commercialization, the extraordinary risks will be gradually eliminated. At the time of commercialization the system's value should be on a par with the installed system's cost.

  2. Active barrier films of PET for solar cell application: Processing and characterization

    SciTech Connect (OSTI)

    Rossi, Gabriella; Scarfato, Paola; Incarnato, Loredana [Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132 - 84084 Fisciano (Italy)

    2014-05-15T23:59:59.000Z

    A preliminary investigation was carried out on the possibility to improve the protective action offered by the standard multilayer structures used to encapsulate photovoltaic devices. With this aim, a commercial active barrier PET-based material, able to absorb oxygen when activated by liquid water, was used to produce flexible and transparent active barrier films, by means of a lab-scale film production plant. The obtained film, tested in terms of thermal, optical and oxygen absorption properties, shows a slow oxygen absorption kinetics, an acceptable transparency and an easy roll-to-roll processability, so proving itself as a good candidate for the development of protective coating for solar cells against the atmospheric degradation agents like the rain.

  3. Control system analysis for off-peak auxiliary heating of passive solar systems

    SciTech Connect (OSTI)

    Murray, H.S.; Melsa, J.L.; Balcomb, J.D.

    1980-01-01T23:59:59.000Z

    A computer simulation method is presented for the design of an electrical auxiliary energy system for passive solar heated structures. The system consists of electrical mats buried in the ground underneath the structure. Energy is stored in the ground during utility off-peak hours and released passively to the heated enclosure. An optimal control strategy is used to determine the system design parameters of depth of mat placement and minimum instaled electrical heating capacity. The optimal control applies combinations of fixed duration energy pulses to the heater, which minimize the room temperature error-squared for each day, assuming advance knowledge of the day's weather. Various realizable control schemes are investigated in an attempt to find a system that approaches the performance of the optimal control system.

  4. Sandia National Laboratories: National Solar Thermal Test Facility

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

    Solar Power, Energy, Facilities, Materials Science, National Solar Thermal Test Facility, News, News & Events, Renewable Energy, Solar, Solar Newsletter, Systems...

  5. Impact of Improved Solar Forecasts on Bulk Power System Operations in ISO-NE (Presentation)

    SciTech Connect (OSTI)

    Brancucci Martinez-Anido, C.; Florita, A.; Hodge, B.M.

    2014-11-01T23:59:59.000Z

    The diurnal nature of solar power is made uncertain by variable cloud cover and the influence of atmospheric conditions on irradiance scattering processes. Its forecasting has become increasingly important to the unit commitment and dispatch process for efficient scheduling of generators in power system operations. This presentation is an overview of a study that examines the value of improved solar forecasts on Bulk Power System Operations.

  6. Solar receiver heliostat reflector having a linear drive and position information system

    DOE Patents [OSTI]

    Horton, Richard H. (Schenectady, NY)

    1980-01-01T23:59:59.000Z

    A heliostat for a solar receiver system comprises an improved drive and control system for the heliostat reflector assembly. The heliostat reflector assembly is controllably driven in a predetermined way by a light-weight drive system so as to be angularly adjustable in both elevation and azimuth to track the sun and efficiently continuously reflect the sun's rays to a focal zone, i.e., heat receiver, which forms part of a solar energy utilization system, such as a solar energy fueled electrical power generation system. The improved drive system includes linear stepping motors which comprise low weight, low cost, electronic pulse driven components. One embodiment comprises linear stepping motors controlled by a programmed, electronic microprocessor. Another embodiment comprises a tape driven system controlled by a position control magnetic tape.

  7. System and method for aligning heliostats of a solar power tower

    DOE Patents [OSTI]

    Convery, Mark R.

    2013-01-01T23:59:59.000Z

    Disclosed is a solar power tower heliostat alignment system and method that includes a solar power tower with a focal area, a plurality of heliostats that each reflect sunlight towards the focal area of the solar power tower, an off-focal area location substantially close to the focal area of the solar power tower, a communication link between the off-focal area location and a misaligned heliostat, and a processor that interprets the communication between the off-focal area location and the misaligned heliostat to identify the misaligned heliostat from the plurality of heliostats and that determines a correction for the identified misaligned heliostat to realign the misaligned heliostat to reflect sunlight towards the focal area of the solar power tower.

  8. Sandia National Laboratories: Solar Tower

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

    CSP R&D Activities at Sandia On March 3, 2011, in Sandia supports the DOE Concentrating Solar Power Program and the CSP industry by providing: R&D on CSP components and systems;...

  9. Solar forecasting review

    E-Print Network [OSTI]

    Inman, Richard Headen

    2012-01-01T23:59:59.000Z

    modeling of solar steam- generators, solar water heating systems, Heating Ventilating and Air Conditioning (HVAC) systems, wind speed predictions, control in power generation systems,

  10. A SYSTEMATIC SURVEY OF HIGH-TEMPERATURE EMISSION IN SOLAR ACTIVE REGIONS

    SciTech Connect (OSTI)

    Warren, Harry P. [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States); Winebarger, Amy R. [NASA Marshall Space Flight Center, VP 62, Huntsville, AL 35812 (United States); Brooks, David H. [College of Science, George Mason University, 4400 University Drive, Fairfax, VA 22030 (United States)

    2012-11-10T23:59:59.000Z

    The recent analysis of observations taken with the EUV Imaging Spectrometer and X-Ray Telescope instruments on Hinode suggests that well-constrained measurements of the temperature distribution in solar active regions can finally be made. Such measurements are critical for constraining theories of coronal heating. Past analysis, however, has suffered from limited sample sizes and large uncertainties at temperatures between 5 and 10 MK. Here we present a systematic study of the differential emission measure distribution in 15 active region cores. We focus on measurements in the 'inter-moss' region, that is, the region between the loop footpoints, where the observations are easier to interpret. To reduce the uncertainties at the highest temperatures we present a new method for isolating the Fe XVIII emission in the AIA/SDO 94 A channel. The resulting differential emission measure distributions confirm our previous analysis showing that the temperature distribution in an active region core is often strongly peaked near 4 MK. We characterize the properties of the emission distribution as a function of the total unsigned magnetic flux. We find that the amount of high-temperature emission in the active region core is correlated with the total unsigned magnetic flux, while the emission at lower temperatures, in contrast, is inversely related. These results provide compelling evidence that high-temperature active region emission is often close to equilibrium, although weaker active regions may be dominated by evolving million degree loops in the core.

  11. Preliminary Results on Luminaire Designs for Hybrid Solar Lighting Systems

    SciTech Connect (OSTI)

    Earl, D.D.

    2001-06-15T23:59:59.000Z

    We report on the design of two hybrid lighting luminaires that blend light from a fiber optic end-emitted solar source with electric T8 fluorescent lamps. Both designs involve the retrofit of a commercially-available recessed fluorescent luminaire with minimal reductions in the original luminaire's optical efficiency. Two methods for high-angle dispersion of fiber optic end-emitted solar light are described and the resulting spatial intensity distributions, simulated using ZEMAX, are compared with standard cylindrical fluorescent tubes. Differences in spatial intensity distribution are qualitatively characterized and potential design improvements discussed.

  12. Hybrid Wind and Solar Electric Systems | Department of Energy

    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.pdfBreaking of Blythe Solar PowerCommercialEnergySandy-Nor'easterHybrid Wind and Solar

  13. Solar Water Heating System Maintenance and Repair | Department of Energy

    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.pdfBreakingMayDepartment of EnergySite Screening Decision Tree SolarSolar Water

  14. Multi-scale comparative spectral analysis of satellite total solar irradiance measurements from 2003 to 2013 reveals a planetary modulation of solar activity and its non-linear dependence on the 11-year solar cycle

    E-Print Network [OSTI]

    Nicola Scafetta; Richard C. Willson

    2013-11-26T23:59:59.000Z

    Herein we adopt a multi-scale dynamical spectral analysis technique to compare and study the dynamical evolution of the harmonic components of the overlapping ACRIMSAT/ACRIM3, SOHO/VIRGO and SORCE/TIM total solar irradiance (TSI) records during 2003.15 to 2013.16 in solar cycles 23 and 24. The three TSI time series present highly correlated patterns. Significant power spectral peaks are common to these records and are observed at the following periods: 0.070 year, 0.097 year, 0.20 year, 0.25 year, 0.30-0.34 year, 0.39 year. Less certain spectral peaks occur at about 0.55 year, 0.60-0.65 year and 0.7-0.9 year. Four main frequency periods at 24.8 days (0.068 year), 27.3 days (0.075 year), at 34-35 days (0.093-0.096 year) and 36-38 days (0.099-0.104 year) characterize the solar rotation cycle. The amplitude of these oscillations, in particular of those with periods larger than 0.5 year, appears to be modulated by the 11-year solar cycle. Similar harmonics have been found in other solar indices. The observed periodicities are found highly coherent with the spring, orbital and synodic periods of Mercury, Venus, Earth and Jupiter. We conclude that solar activity is likely modulated by planetary gravitational and electromagnetic forces acting on the sun. The strength of the sun's response to planetary forcing depends non-linearly on the state of internal solar dynamics: planetary-sun coupling effects are enhanced during solar activity maxima and attenuated during minima.

  15. Increasing Community Access to Solar: Designing and Developing a Shared Solar Photovoltaic System (Fact Sheet), U.S. Department of Energy (DOE)

    Broader source: Energy.gov [DOE]

    This document introduces the Energy Department’s new Guide to Community Shared Solar: Utility, Private, and Nonprofit Project Development. The guide is designed to help those who want to develop community shared solar projects—from community organizers and advocates to utility managers and government officials—navigate the process of developing shared systems, from early planning to implementation.

  16. Chaotic mean wind in turbulent thermal convection and long-term correlations in solar activity

    E-Print Network [OSTI]

    A. Bershadskii

    2009-12-25T23:59:59.000Z

    It is shown that correlation function of the mean wind velocity in a turbulent thermal convection (Rayleigh number $Ra \\sim 10^{11}$) exhibits exponential decay with a very long correlation time, while corresponding largest Lyapunov exponent is certainly positive. These results together with the reconstructed phase portrait indicate presence of a chaotic component in the examined mean wind. Telegraph approximation is also used to study relative contribution of the chaotic and stochastic components to the mean wind fluctuations and an equilibrium between these components has been studied. Since solar activity is based on the thermal convection processes, it is reasoned that the observed solar activity long-term correlations can be an imprint of the mean wind chaotic properties. In particular, correlation function of the daily sunspots number exhibits exponential decay with a very long correlation time and corresponding largest Lyapunov exponent is certainly positive, also relative contribution of the chaotic and stochastic components follows the same pattern as for the convection mean wind.

  17. Confined Flares in Solar Active Region 12192 from 2014 October 18 to 29

    E-Print Network [OSTI]

    Chen, Huadong; Ma, Suli; Yang, Shuhong; Li, Leping; Huang, Xin; Xiao, Junmin

    2015-01-01T23:59:59.000Z

    Using the observations from the Atmospheric Imaging Assembly (AIA) and Helioseismic and Magnetic Imager (HMI) aboard the Solar Dynamics Observatory (SDO), we investigate six X-class and twenty-nine M-class flares occurring in solar active region (AR) 12192 from October 18 to 29. Among them, thirty (including six X- and twenty-four M-class) flares originated from the AR core and the other five M-flares appeared at the AR periphery. Four of the X-flares exhibited similar flaring structures, indicating they were homologous flares with analogous triggering mechanism. The possible scenario is: photospheric motions of emerged magnetic fluxes lead to shearing of the associated coronal magnetic field, which then yields a tether-cutting favorable configuration. Among the five periphery M-flares, four were associated with jet activities. The HMI vertical magnetic field data show that the photospheric fluxes of opposite magnetic polarities emerged, converged and canceled with each other at the footpoints of the jets bef...

  18. Research & Development Needs for Building-Integrated Solar Technologie...

    Energy Savers [EERE]

    photovoltaic-thermal systems (PVT), active solar lighting, and building-integrated photovoltaics (BIPV). View the full report Report: Research & Development Needs for...

  19. High-Performance Home Technologies: Solar Thermal & Photovoltaic Systems

    SciTech Connect (OSTI)

    Baechler, M.; Gilbride, T.; Ruiz, K.; Steward, H.; Love, P.

    2007-06-01T23:59:59.000Z

    This document is the sixth volume of the Building America Best Practices Series. It presents information that is useful throughout the United States for enhancing the energy efficiency practices in the specific climate zones that are presented in the first five Best Practices volumes. It provides an introduction to current photovoltaic and solar thermal building practices. Information about window selection and shading is included.

  20. Solar forecasting review

    E-Print Network [OSTI]

    Inman, Richard Headen

    2012-01-01T23:59:59.000Z

    solar photovoltaics (PV) in electric power systems utilizingphotovoltaics (PV) in traditional electric power systems,”