Preparation of high-temperature resistant selective paints for solar absorbers

Z. Crnjak Orel

doi:10.1117/12.217356

23 August 1995 Preparation of high-temperature resistant selective paints for solar absorbers

Z. Crnjak Orel

Proceedings Volume 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV; (1995) https://doi.org/10.1117/12.217356
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Spectrally selective paint coatings were prepared from organically modified siloxane in combination with two types of different pigments (organic soot-FW2 or inorganic FeMnCuO_x-P320). To optimize the low-emittance properties, various concentrations of pigments were used for the preparation of paints. From seven prepared paints, different thicknesses were applied on high-reflecting Al foil by draw bar coater. For all paints, optical and thermal properties were determined as well as their adhesion resistance. For higher concentration of used pigment better selectivities were obtained, but at the same time paints exhibited bad adhesion properties. The thickness of paints having different concentration of the added pigment was optimized in correlation with their spectrally selective properties and adhesion resistivities. The results of this study indicate that pigment to volume concentration ratio has to be about 20% for thicknesses of about 1.7 g/m² - 2.0 g/m². Solar absorbance for these samples were a_s equals 0.90 - 0.92 with thermal emittance of e_T equals 0.20 - 0.25. Temperature stability of these samples was followed by FT-IR spectroscopy at 180 degree(s)C and 300 degree(s)C for three weeks and 68 hours, respectively. The obtained results indicate good temperature stability of prepared paints.

Citation Download Citation

Z. Crnjak Orel "Preparation of high-temperature resistant selective paints for solar absorbers", Proc. SPIE 2531, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIV, (23 August 1995); https://doi.org/10.1117/12.217356

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