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Proceedings Paper

Wet-chemistry based selective coatings for concentrating solar power
Author(s): Eran Maimon; Abraham Kribus; Yuri Flitsanov; Oleg Shkolnik; Daniel Feuermann; Camille Zwicker; Liraz Larush; Daniel Mandler; Shlomo Magdassi
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Paper Abstract

Spectrally selective coatings are common in low and medium temperature solar applications from solar water heating collectors to parabolic trough absorber tubes. They are also an essential element for high efficiency in higher temperature Concentrating Solar Power (CSP) systems. Selective coatings for CSP are usually prepared using advanced expensive methods such as sputtering and vapor deposition. In this work, coatings were prepared using low-cost wet-chemistry methods. Solutions based on Alumina and Silica sol gel were prepared and then dispersed with black spinel pigments. The black dispersions were applied by spray/roll coating methods on stainless steel plates. The spectral emissivity of sample coatings was measured in the temperature range between 200 and 500°C, while the spectral absorptivity was measured at room temperature and 500°C. Emissivity at wavelengths of 0.4–1.7 μm was evaluated indirectly using multiple measurements of directional reflectivity. Emissivity at wavelengths 2–14 μm was measured directly using a broadband IR camera that acquires the radiation emitted from the sample, and a range of spectral filters. Emissivity measurement results for a range of coated samples will be presented, and the impact of coating thickness, pigment loading, and surface preparation will be discussed.

Paper Details

Date Published: 18 September 2013
PDF: 13 pages
Proc. SPIE 8834, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration X, 88340D (18 September 2013); doi: 10.1117/12.2025579
Show Author Affiliations
Eran Maimon, Tel Aviv Univ. (Israel)
Abraham Kribus, Tel Aviv Univ. (Israel)
Yuri Flitsanov, Tel Aviv Univ. (Israel)
Oleg Shkolnik, Ben-Gurion Univ. of the Negev (Israel)
Daniel Feuermann, Ben-Gurion Univ. of the Negev (Israel)
Camille Zwicker, The Hebrew Univ. of Jerusalem (Israel)
Liraz Larush, The Hebrew Univ. of Jerusalem (Israel)
Daniel Mandler, The Hebrew Univ. of Jerusalem (Israel)
Shlomo Magdassi, The Hebrew Univ. of Jerusalem (Israel)

Published in SPIE Proceedings Vol. 8834:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration X
Roland Winston; Jeffrey Gordon, Editor(s)

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