In high-temperature solar-thermal systems the conversion of solar to thermal energy requires a radiation absorbing surface to transfer the radiative solar energy to the working fluid. The present study focuses on the generation of a moving radiation absorber using particles suspended in the working fluid. Three methods of particle entrainment in a gas were investigated. Elutriating fine particles from a spouted bed was found to be the preferred method. The diameter range of the entrained carbon black particles was , with 99.7% of the particles having an equivalent diameter less than , and 48% of the projected surface area was due to agglomerated particles with average equivalent diameter . The moving radiation absorber was tested in a solar receiver using nitrogen as a working fluid. The inner wall temperatures in the receiver cavity were below the gas exit temperature, which shows that the bulk heat transfer from the incoming solar radiation to the gas takes place via the moving radiation absorbing particles.
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e-mail: helena.klein@weizmann.ac.il
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August 2006
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Generation of a Radiation Absorbing Medium for a Solar Receiver by Elutriation of Fine Particles From a Spouted Bed
Hanna H. Klein,
Hanna H. Klein
Department of Environmental Science and Energy Research,
e-mail: helena.klein@weizmann.ac.il
Weizmann Institute of Science
, P.O. Box 26, Rehovot 76100, Israel
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Rachamim Rubin,
Rachamim Rubin
Solar Research Facilities Unit,
Weizmann Institute of Science
, P.O. Box 26, Rehovot 76100, Israel
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Jacob Karni
Jacob Karni
Department of Environmental Science and Energy Research,
Weizmann Institute of Science
, P.O. Box 26, Rehovot 76100, Israel
Search for other works by this author on:
Hanna H. Klein
Department of Environmental Science and Energy Research,
Weizmann Institute of Science
, P.O. Box 26, Rehovot 76100, Israele-mail: helena.klein@weizmann.ac.il
Rachamim Rubin
Solar Research Facilities Unit,
Weizmann Institute of Science
, P.O. Box 26, Rehovot 76100, Israel
Jacob Karni
Department of Environmental Science and Energy Research,
Weizmann Institute of Science
, P.O. Box 26, Rehovot 76100, IsraelJ. Sol. Energy Eng. Aug 2006, 128(3): 406-408 (3 pages)
Published Online: February 15, 2006
Article history
Received:
October 2, 2005
Revised:
February 15, 2006
Citation
Klein, H. H., Rubin, R., and Karni, J. (February 15, 2006). "Generation of a Radiation Absorbing Medium for a Solar Receiver by Elutriation of Fine Particles From a Spouted Bed." ASME. J. Sol. Energy Eng. August 2006; 128(3): 406–408. https://doi.org/10.1115/1.2212441
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