Mr. Eran Maimon Profile

Eran Maimon

at Tel Aviv Univ

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Proceedings Article | 18 September 2013 Paper

Wet-chemistry based selective coatings for concentrating solar power

Eran Maimon, Abraham Kribus, Yuri Flitsanov, Oleg Shkolnik, Daniel Feuermann, Camille Zwicker, Liraz Larush, Daniel Mandler, Shlomo Magdassi

Proceedings Volume 8834, 88340D (2013) https://doi.org/10.1117/12.2025579

KEYWORDS: Gold, Silica, Temperature metrology, Reflectivity, Black bodies, Infrared cameras, Solar energy, Aluminum, Spinel, Cameras

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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.

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