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Proceedings Paper

Highly Selective Narrowband Absorbers in Combination with Fluorescent Concentrators
Author(s): W. Stahl; V. Wittwer
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Paper Abstract

The conversion of radiation into heat is significantly improved by selective solar absorbers. When the only losses are radiative, the selectivity determines the stagnation temperature. Low emissivity and stability of the selective surface is a problem in high temperature applications. A new type of selective absorber in com-bination with the fluorescent concentrator is presented. Thin coatings working as interference layers on highly polished metal substrates give a high absorbtivity for the emitted fluorescent light, which has a high intensity over a narrow wavelength range. The very thin coating (< 500 nm) does not increase the emissivity of the metal substrate. Therefore the temperature dependence of the emissivity is determined by the metal alone. With a test collector, stagnation temperatures of 808 K were reached. Theoretical calculations and experimental results are given.

Paper Details

Date Published: 1 December 1983
PDF: 5 pages
Proc. SPIE 0428, Optical Materials and Process Technology for Energy Efficiency and Solar Applications, (1 December 1983); doi: 10.1117/12.936319
Show Author Affiliations
W. Stahl, Fraunhofer-Institut fur Solare Energiesysteme (West Germany)
V. Wittwer, Fraunhofer-Institut fur Solare Energiesysteme (West Germany)

Published in SPIE Proceedings Vol. 0428:
Optical Materials and Process Technology for Energy Efficiency and Solar Applications
Carl M. Lampert, Editor(s)

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