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Open AccessArticle

Water Saving in CSP Plants by a Novel Hydrophilic Anti-Soiling Coating for Solar Reflectors

1
DLR German Aerospace Center, Institute of Solar Research, Plataforma Solar de Almería, Ctra. Senés Km. 4, 04200 Tabernas, Spain
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CIEMAT-PSA, Ctra. Senés, 04200 Tabernas, Spain
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IK4-Tekniker, Polo Tecnológico de Eibar, C/Iñaki Goenaga, 5. Eibar, 20600 Gipuzkoa, Spain
4
Rioglass Solar S.A. PI Villallana, Pola de Lena, 33695 Asturias, Spain
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(11), 739; https://doi.org/10.3390/coatings9110739
Received: 1 October 2019 / Revised: 27 October 2019 / Accepted: 4 November 2019 / Published: 7 November 2019
(This article belongs to the Special Issue Surfaces and Interfaces for Renewable Energy)
In this work, results of the outdoor exposure campaign of a newly developed hydrophilic anti-soiling coating for concentrated solar thermal power (CSP) mirrors are presented. The material was exposed for nearly two years under realistic outdoor conditions and the influence of two different cleaning techniques was evaluated. Mirror samples were analyzed during exposure and their reflectance and cleanliness were measured. The performance of the anti-soiling coated mirror samples was compared to conventional uncoated silvered-glass mirrors. The coatings showed appropriate anti-soiling and easy-to-clean behavior, with a mean cleanliness gain of 1 pp and maximum values under strong soiling conditions of up to over 7 pp. Cleanliness of the coated samples stayed higher throughout the whole campaign before and after cleaning, resulting in lower soiling rate compared to the reference material. Taking into account these values and supposing a threshold for cleaning of 96%, the number of cleaning cycles could be decreased by up to 11%. Finally, the coated material showed negligible degradation, not exceeding the degradation detected for the reference material. View Full-Text
Keywords: concentrated solar thermal power; water saving; solar reflector; anti-soiling coating; outdoor test; reflectance measurement; soiling rate; cleaning method concentrated solar thermal power; water saving; solar reflector; anti-soiling coating; outdoor test; reflectance measurement; soiling rate; cleaning method
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Wette, J.; Fernández-García, A.; Sutter, F.; Buendía-Martínez, F.; Argüelles-Arízcun, D.; Azpitarte, I.; Pérez, G. Water Saving in CSP Plants by a Novel Hydrophilic Anti-Soiling Coating for Solar Reflectors. Coatings 2019, 9, 739.

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