Characterization and Thermal Aging Tests of Cr Based Multilayer for Unconcentrated Solar Thermal Applications

Antonio Caldarelli; Carmine D'Alessandro; Davide De Maio; Daniela De Luca; Eliana Gaudino; Marilena Musto; Emiliano Di Gennaro; Roberto Russo

doi:10.20944/preprints202107.0128.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 5 July 2021 / Approved: 6 July 2021 / Online: 6 July 2021 (09:29:09 CEST)

Optical characterization and thermal aging tests are performed on a sputter-deposited coating, consisting of SiO₂/Cr₂O₃/Cr/Cr₂O₃ layers, designed and developed as a selective solar absorber to be used for unconcentrated solar thermal applications. Both measurements are performed by using a home-made apparatus, which mimics a flat plate collector under high vacuum. A Performance Criterion (PC_η(T)), based on absorber efficiency is proposed, and a forecast of service lifetime is obtained. As a result of the thermal aging tests, the selective solar absorber under study appears to be highly efficient at mid temperatures (up to 573 K) and thermally stable at temperatures (up to 690 K).

Spectrally selective coating; Optical properties; Thermal stability; High temperature emissivity; Energy activation; Prediction of lifetime test; Thermal aging.

Chemistry and Materials Science, Biomaterials

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Characterization and Thermal Aging Tests of Cr Based Multilayer for Unconcentrated Solar Thermal Applications

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