Calorimetric measurements of the total hemispherical emittance of selective surfaces at high temperatures

A. Brunotte; Michel P. Lazarov; R. Sizmann

doi:10.1117/12.130497

25 November 1992 Calorimetric measurements of the total hemispherical emittance of selective surfaces at high temperatures

A. Brunotte, Michel P. Lazarov, R. Sizmann

Author Affiliations +

Proceedings Volume 1727, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows; (1992) https://doi.org/10.1117/12.130497
Event: Optical Materials Technology for Energy Efficiency and Solar Energy, 1992, Toulouse-Labege, France

Abstract

An apparatus is presented for measuring the hemispherical emittance (epsilon) in a temperature range of 100 - 400 degree(s)C. It is designed especially for samples with low values of (epsilon) between 0.015 and 0.15. The error margin lies around 6% of the measured value. A polished stainless steel sample (PTB, Braunschweig, Germany) serves as reference reproducing the PTB-results within 2%. Measurements of solar selective absorbers, a TiN_xO_y-Cu tandem absorber, a multilayer cermet absorber, and an Al₂O₃-Ni-Al absorber have been carried out. The values of (epsilon) range between 0.02 and 0.15 for 100 degree(s)C and between 0.035 and 0.3 for 400 degree(s)C. TiN_xO_y-Cu achieves the lowest values in both cases. The effects of temperature on the optical constants in the near IR of TiN_xO_y-Cu tandem layers are discussed. The results of measurements indicate a shift from dielectric to metallic behavior with rising temperature.

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A. Brunotte, Michel P. Lazarov, and R. Sizmann "Calorimetric measurements of the total hemispherical emittance of selective surfaces at high temperatures", Proc. SPIE 1727, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows, (25 November 1992); https://doi.org/10.1117/12.130497

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