Solar Coatings Based on Ag Infrared Reflector with High Stability at Medium and High Temperature

Salvatore Esposito, Antonio D’Angelo, Claudia Diletto, Antonio Guglielmo, Michela Lanchi and Gabriella Rossi
Additional contact information
Salvatore Esposito: Portici Research Centre, ENEA, P.le E. Fermi 1, 80055 Portici, Italy
Antonio D’Angelo: Portici Research Centre, ENEA, P.le E. Fermi 1, 80055 Portici, Italy
Claudia Diletto: Portici Research Centre, ENEA, P.le E. Fermi 1, 80055 Portici, Italy
Antonio Guglielmo: Portici Research Centre, ENEA, P.le E. Fermi 1, 80055 Portici, Italy
Michela Lanchi: Casaccia Research Centre, ENEA, Via Anguillarese 301, 00123 S. Maria di Galeria, Italy
Gabriella Rossi: Portici Research Centre, ENEA, P.le E. Fermi 1, 80055 Portici, Italy

Energies, 2021, vol. 14, issue 18, 1-18

Abstract: The manufacturing of thermally stable solar coatings with high photo-thermal performance represents a key factor for the further deployment of the CSP technology. Since 2005, ENEA has been developing solar coatings suitable for medium and high temperature applications based on the technology of double nitride cermet, by employing silver and tungsten as infrared reflectors, respectively. Thanks to the high infrared reflectance of silver, the corresponding coatings have better optical performance than those with tungsten; however, the high diffusivity of silver compromises its use at high temperature. In order to improve the structural and chemical stability at medium and high temperature of coatings based on silver, this infrared reflector was placed between compact and uniform layers of metal and cermet manufactured by using high-energy and fast deposition processes. In particular, an Unbalanced Magnetron cathode was adopted to promote an ion-assisted deposition process that improved uniformity and compactness of the metal and cermet films. The new coating shows no photo-thermal parameters degradation after 25 years of service at the operating temperature of 400 °C, while its photo-thermal conversion efficiency decreases by only 1.5% after 25 years of service at an operating temperature of 514 °C.

Keywords: solar coating; infrared reflector; cermet; thermal stability; durability; accelerated test (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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