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Proceedings Paper

Amount of solar radiation absorbed by trough collectors with non-imaging optics
Author(s): A. Haeberle; Peter Apian-Bennewitz; Thomas Schmidt; Thomas Troescher; Volker Wittwer
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Paper Abstract

Solar collectors using non-imaging mirror troughs (e.g. CPC-troughs) significantly alter the angular and spatial distribution of incident radiation from the aperture to the absorber surface. For flat plate collectors the transmission of transparent covers (including honeycomb transparent insulation materials) can be modelled with one incidence angle modifier symmetrical to the collector's normal. After multiple reflections in a mirror trough however, this symmetry is not maintained and a more complex treatment is required. For three examples of mirror troughs, the angular distribution of gained solar radiation was calculated using a ray- tracing program, taking into account the angular dependence of the transmission of a cover and of the absorptance of a selective coating. The solar radiation at the aperture was modelled using the continuous diffuse radiation model of A. Brunger with radiation data from Freiburg.

Paper Details

Date Published: 9 September 1994
PDF: 7 pages
Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185398
Show Author Affiliations
A. Haeberle, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Peter Apian-Bennewitz, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Thomas Schmidt, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Thomas Troescher, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Volker Wittwer, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)

Published in SPIE Proceedings Vol. 2255:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII
Volker Wittwer; Claes G. Granqvist; Carl M. Lampert, Editor(s)

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