Spectral radiant heat emitted by honeycomb-type solar collector covers

Andreas Zipfel; Joerg J. Dengler; Werner J. Platzer

doi:10.1117/12.185413

9 September 1994 Spectral radiant heat emitted by honeycomb-type solar collector covers

Andreas Zipfel, Joerg J. Dengler, Werner J. Platzer

Proceedings Volume 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII; (1994) https://doi.org/10.1117/12.185413
Event: Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, 1994, Freiburg, Germany

Abstract

A new type of transparent insulation with glass capillaries allows the construction of high temperature flat-plate solar collectors reaching stagnation temperatures of 260 degree(s)C and more. In the temperature range above 100 degree(s)C, the radiant heat is the dominant heat loss mechanism. For the plastic honeycomb materials used up to now, the heat losses were described adequately with a non-spectral `grey' model. To describe the radiant heat losses for the new glass capillary collector covers, a spectral analysis is necessary, due to the strong spectral dependence of the absorptance in glass. A new experimental set-up allows the measurements of the spectral radiant heat emitted by large samples, not only integrated over a hemisphere but also with angular resolution. A theoretical model for the calculation of the spectral, angle-dependent total emission of a Tl/absorber construction has been developed. The presented results of the calculations for glass capillaries show good agreement with the measurements.

Citation Download Citation

Andreas Zipfel, Joerg J. Dengler, and Werner J. Platzer "Spectral radiant heat emitted by honeycomb-type solar collector covers", Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); https://doi.org/10.1117/12.185413

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