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TECHNICAL PAPERS

Thermal Integral Micro-Generation Systems for Solar and Conventional Use

[+] Author and Article Information
Abraham Kribus

Environmental Sciences and Energy Research Department, Weizmann Institute of Science, Rehovot 76100, Israele-mail: avi.kribus@weizmann.ac.il

J. Sol. Energy Eng 124(2), 189-197 (Apr 24, 2002) (9 pages) doi:10.1115/1.1464879 History: Received October 01, 2000; Revised November 01, 2001; Online April 24, 2002
Copyright © 2002 by ASME
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References

Figures

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Options for Mini-Dish concentrator: a) Receiver installed in the primary focus; b) An off-axis dish; c) Cassegrainian; the light is folded by a hyperboloidal reflector and reconcentrated by a terminal non-imaging concentrator.
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a) Structure of the STIMGen receiver/generator, the shown window is optional; b) Solar absorber containing internal passages for Brayton cycle heat exchange and for hybrid operation; the heat exchanger passages may be channels (as shown), or another microstructure that provides enhanced heat transfer area.
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System performance of a Stirling STIMGen as a function of receiver temperature: a) Total efficiency from radiation to electricity for dish diameter of 0.5 m and 1 m; b) Dominant loss mechanisms for D=0.5 m: receiver emission, engine internal conduction, and internal radiation are normalized to the collected radiation power; external irreversibility is defined as 1−(TH−TC)/(THS−TCS).
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System performance of a Stirling STIMGen as a function of dish diameter: a) Total efficiency from radiation to electricity for receiver temperature of 1,100 K, and generator conductivity of 0.1 and 1.0 W m−1 K−1;b) Dominant loss mechanisms for T=1,100 K: engine internal conduction is normalized to the collected radiation power; external irreversibility is defined as 1−(TH−TC)/(THS−TCS).
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System performance of a Brayton STIMGen: a) Total efficiency from radiation to electricity as a function of receiver temperature for dish diameter of 0.5 m and 1 m; b) Total efficiency from radiation to electricity as a function of dish size for receiver temperature of 1,200 K, and generator conductivity of 0.1 and 1.0 W m−1 K−1.

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