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TECHNICAL BRIEFS

Generation of a Radiation Absorbing Medium for a Solar Receiver by Elutriation of Fine Particles From a Spouted Bed

[+] Author and Article Information
Hanna H. Klein

Department of Environmental Science and Energy Research,  Weizmann Institute of Science, P.O. Box 26, Rehovot 76100, Israelhelena.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, Israel

J. Sol. Energy Eng 128(3), 406-408 (Feb 15, 2006) (3 pages) doi:10.1115/1.2212441 History: Received October 02, 2005; Revised February 15, 2006

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 0.03025μm, with 99.7% of the particles having an equivalent diameter less than 1μm, and 48% of the projected surface area was due to agglomerated particles with average equivalent diameter >5μm. 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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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Normalized particle size distribution of carbon black Asbury 5358 in the gas flow as a function of equivalent particle diameter using different entrainment methods

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Figure 2

Particle entrainment system

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Figure 3

Particle load as a function of time comparing experiments with different elutriation methods

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Figure 4

Particle load as a function of time for different flow rates using the spouted-bed particle entrainment chamber

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Figure 5

The dimensionless average wall temperature along the receiver length axis for two experiments with nitrogen as the working fluid

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