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Gong Shenping; Li Junfeng; Gao Yunfeng, E-mail: gongsp@tsinghua.edu.cn2011
AbstractAbstract
[en] A solar collector system is a possible method using solar energy to deflect Earth-threatening near-Earth objects. We investigate the dynamics and control of a solar collector system including a main collector (MC) and secondary collector (SC). The MC is used to collect the sunlight to its focal point, where the SC is placed and directs the collected light to an asteroid. Both the relative position and attitude of the two collectors should be accurately controlled to achieve the desired optical path. First, the dynamical equation of the relative motion of the two collectors in the vicinity of the asteroid is modeled. Secondly, the nonlinear sliding-mode method is employed to design a control law to achieve the desired configuration of the two collectors. Finally, the deflection capability of this solar collector system is compared with those of the gravitational tractor and solar sail gravitational tractor. The results show that the solar collector is much more efficient with respect to deflection capability.
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Available from http://dx.doi.org/10.1088/1674-4527/11/2/009; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Research in Astronomy and Astrophysics; ISSN 1674-4527;
; v. 11(2); p. 205-224

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Appelbaum, J.; Crutchik, M.
International conference on comparative assessments of solar power technologies1994
International conference on comparative assessments of solar power technologies1994
AbstractAbstract
[en] Short communication
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Roy, A. (ed.) (department of chemical engineering, Ben-Gurion university of the Negev, Beer-Sheva (Israel)); Ministry of Science and Technology, Jerusalem (Israel); 120 p; Feb 1994; p. 1; SOLCOM I 1994: International conference on comparative assessments of solar power technologies; Jerusalem (Israel); 14-18 Feb 1994; NCRD--94-1; Also available from Library of the Ministry of Science and Technology, State of Israel
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AbstractAbstract
[en] The chances of the title systems on the Dutch market are discussed. It appears that the most important growth for solar thermal energy systems will first be realized in utility buildings. 5 ills
Original Title
Markt voor grote thermische zonne-energiesystemen groeit
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AbstractAbstract
[en] Transparent covers used in solar collectors collect both solar radiation and dirt from the environment. The dirt collected reduces the amount of useful incident solar radiation that would have been transmitted into system. Samples of ordinary glass used as transparent covers in solar devices at Sokoto Energy Research Centre were exposed to the weather for a period of one year. Cleaning was done on daily, weekly, bi-monthly and monthly basis. A sample was left uncleaned throughout the period. Using the measured average daily transmittance for all seasons as a constant for such glass covers in Sokoto showed that varying the cost/wash/collector for a collector of one-square metre receiver area from =N=0.50 to =N=50.00, would vary the frequency of washing the collector covers from 160 down to 25 times annually respectively. Cost of washing per annum would also vary from 79.90 Naira to 834.46 Naira
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Available from Atiku, A. T. (Solar Energy Research Centre, Usman Dan Fodio University, Sokoto, (Nigeria))
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Journal Article
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Nigerian Journal of Renewable Energy; ISSN 1115-0610;
; v. 5(1,2); p. 120-124

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AbstractAbstract
[en] Short communication
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Israel Physical Society, Jerusalem (Israel); Bulletin of the Israel Physical Society; v. 43; 204 p; 17 Apr 1997; p. 120; Israel Physical Society; Beer Sheva (Israel); The Israel Physical Society 1997 Annual Meeting; Beer Sheva (Israel); 17 Apr 1997
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Supranto; Daud, W.R.W.; Sopian, K.; Othman, M.Y.; Yatim, B.
Proceedings of World Renewable Energy Congress '992000
Proceedings of World Renewable Energy Congress '992000
AbstractAbstract
[en] A solar simulator has been designed and constructed for indoor testing for solar collectors. The simulator consists of 45 halogen lamps. Each lamp has a rated power of a 300 watts. The lamps in ten rows where each row consists of 4 to 5 lamps. The lamps occupied area 6 m2. Dimmers are used to control the amount of lamp intensities. The spacing between the lamps and the collector is about 150 cm. The intensities of the lamps are measured using a pyranometer. The intensity contours or mappings for minimum and maximum average pyranometer readings about 280 to 640 W/m2 are produced, with errors are about of 3.16 % to 4.5 %. (Author)
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Ministry of Energy, Communication and Multimedia Malaysia, Kuala Lumpur (Malaysia); 589 p; 2000; p. 153-156; World renewable energy congress '99; Kuala Lumpur (Malaysia); 8-11 Jun 1999; Available at Malaysian Inst. for Nuclear Technology Research (MINT), Bangi, Malaysia; 4 refs, 5 figs
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Boye Barry, M.
International Centre for Theoretical Physics, Trieste (Italy)1990
International Centre for Theoretical Physics, Trieste (Italy)1990
AbstractAbstract
[en] In this paper, we study a collector, made by cheap local materials (wood, aluminium, etc.), and prepared in the carpenteries, and in the mechanic work rooms with a simple technology. The efficiency of our collector is compared with several variants made in other countries. (author). 9 refs, 6 figs, 2 tabs
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Dec 1990; 15 p
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Kuo, Chung-Feng Jeffrey; Feriyonika; Huang, Chung-Ching; Kuo, Yong-Lin, E-mail: jeffreykuo@mail.ntust.edu.tw2012
AbstractAbstract
[en] Highlights: ► Analysis of processing parameters is presented to Fresnel lens solar collector. ► Orthogonal array, variance analysis, and response surface methodology are employed. ► Best combination of processing parameters is searched by optimization methods. ► Confirmation experiment was conducted to validate the results. - Abstract: This study analyzed and evaluated important parameters in fabrication of Fresnel lens solar collector (melt temperature, mold temperature, packing pressure, and injection speed) based on its two qualities (ratio of power efficiency and percentage error of groove filling ratio). To design the experiment effectively, Taguchi method was applied. The experimental results were analyzed by analysis of variance (ANOVA) in order to derive the significant parameters affecting each quality. Relationships among significant parameters and each quality were established using the response surface methodology (RSM). Two equations were integrated to derive a fitness function, which was optimized by two popular optimization methods – particle swarm optimization (PSO) and genetic algorithm (GA). Optimization results from both methods were chosen based on the highest fitness value. The results showed that with the optimal combination (270 °C, 100 °C, 1040.4 bar, and 60 mm/s for melt temperature, mold temperature, packing pressure, and injection speed, respectively), a high ratio of conversion efficiency and a low percentage error of groove filling ratio could be successfully derived. Confirmation experiment was conducted to validate the results.
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S0196-8904(11)00348-7; Available from http://dx.doi.org/10.1016/j.enconman.2011.12.003; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
[en] Lithuania is situated between 54-56 deg. of Northern Latitudes, which it is the same as UK, Southern Denmarks and Southern Sweden. Climate conditions in Lithuania are comparable, or even better, than in neighboring countries. Trying to get into the market with the products, made somewhere out of Lithuania, did not let us to come even to theoretical economical efficiency of the systems, and only the local production of solar collectors and accumulating tanks, gave positive results. Domestic hot water systems (DHWS) with the new collectors and storage tanks, showed rather good approximate figures of the system efficiency. The payback of such solar DHWS, in comparison with electricity, is in average 8.5 years. (au)
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Elvang, A.G.; Iversen, S. (eds.); International Solar Energy Society (ISES), Rome (Italy); Teknologisk Institut, Taastrup (Denmark). SolEnergiCenter Danmark; Danvak ApS, Lyngby (Denmark); [CD-ROM]; 2000; p. 3; 3. ISES European solar congress; Copenhagen (Denmark); 19-22 Jun 2000; Available on loan from Risoe Library, P.O. Box 49, DK-4000 Roskilde, Denmark
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[en] A Life Cycle Assessment (LCA) is a tool for analysing and estimating the total influence on the environment during the complete life cycle of a certain product. The assessment can bring valuable information about the production processes, the use of materials, the use and the disposal of the product. This information can be used to determine, how to improve the product environmentally. The LCA information can also be used as a comparative study to determine which of two products are environmentally preferably. LCA''s on solar collectors are interesting because solar energy systems are introduced to encourage a sustainable development, hence it follows that the systems themselves should be based on a sustainable technology. The collector should produce as much energy as possible during its lifetime, but it is also important that it is produced in an environmentally friendly way, that it can be disposed properly after use and so on. (orig.) 2 refs
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Konttinen, P.; Lund, P.H. (eds.); Helsinki Univ. of Technology, Otaniemi (Finland). Advanced Energy Systems and Technologies; 500 p; ISBN 951-22-3567-6;
; 1997; p. 45-50; 7. international conference on solar energy at high latitudes and solar exhibition; Espoo (Finland); 9-13 Jun 1997; Available from Helsinki University of Technology, Advanced Energy Systems and Technologies, P.O.Box 2200, FIN-02015 HUT, Finland

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