Solar Coatings Based on Ag Infrared Reflector with High Stability at Medium and High Temperature
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 doub...
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doaj-74f55a4b6894473b9873a31c10a7f0732021-09-26T00:05:52ZengMDPI AGEnergies1996-10732021-09-01145910591010.3390/en14185910Solar Coatings Based on Ag Infrared Reflector with High Stability at Medium and High TemperatureSalvatore Esposito0Antonio D’Angelo1Claudia Diletto2Antonio Guglielmo3Michela Lanchi4Gabriella Rossi5Portici Research Centre, ENEA, P.le E. Fermi 1, 80055 Portici, ItalyPortici Research Centre, ENEA, P.le E. Fermi 1, 80055 Portici, ItalyPortici Research Centre, ENEA, P.le E. Fermi 1, 80055 Portici, ItalyPortici Research Centre, ENEA, P.le E. Fermi 1, 80055 Portici, ItalyCasaccia Research Centre, ENEA, Via Anguillarese 301, 00123 S. Maria di Galeria, ItalyPortici Research Centre, ENEA, P.le E. Fermi 1, 80055 Portici, ItalyThe 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.https://www.mdpi.com/1996-1073/14/18/5910solar coatinginfrared reflectorcermetthermal stabilitydurabilityaccelerated test |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Salvatore Esposito Antonio D’Angelo Claudia Diletto Antonio Guglielmo Michela Lanchi Gabriella Rossi |
spellingShingle |
Salvatore Esposito Antonio D’Angelo Claudia Diletto Antonio Guglielmo Michela Lanchi Gabriella Rossi Solar Coatings Based on Ag Infrared Reflector with High Stability at Medium and High Temperature Energies solar coating infrared reflector cermet thermal stability durability accelerated test |
author_facet |
Salvatore Esposito Antonio D’Angelo Claudia Diletto Antonio Guglielmo Michela Lanchi Gabriella Rossi |
author_sort |
Salvatore Esposito |
title |
Solar Coatings Based on Ag Infrared Reflector with High Stability at Medium and High Temperature |
title_short |
Solar Coatings Based on Ag Infrared Reflector with High Stability at Medium and High Temperature |
title_full |
Solar Coatings Based on Ag Infrared Reflector with High Stability at Medium and High Temperature |
title_fullStr |
Solar Coatings Based on Ag Infrared Reflector with High Stability at Medium and High Temperature |
title_full_unstemmed |
Solar Coatings Based on Ag Infrared Reflector with High Stability at Medium and High Temperature |
title_sort |
solar coatings based on ag infrared reflector with high stability at medium and high temperature |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2021-09-01 |
description |
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. |
topic |
solar coating infrared reflector cermet thermal stability durability accelerated test |
url |
https://www.mdpi.com/1996-1073/14/18/5910 |
work_keys_str_mv |
AT salvatoreesposito solarcoatingsbasedonaginfraredreflectorwithhighstabilityatmediumandhightemperature AT antoniodangelo solarcoatingsbasedonaginfraredreflectorwithhighstabilityatmediumandhightemperature AT claudiadiletto solarcoatingsbasedonaginfraredreflectorwithhighstabilityatmediumandhightemperature AT antonioguglielmo solarcoatingsbasedonaginfraredreflectorwithhighstabilityatmediumandhightemperature AT michelalanchi solarcoatingsbasedonaginfraredreflectorwithhighstabilityatmediumandhightemperature AT gabriellarossi solarcoatingsbasedonaginfraredreflectorwithhighstabilityatmediumandhightemperature |
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