The thermal emissivity of selective solar absorbers is a critical determinant of their operational efficiency. This paper details the computation of hemispherical emissivity for multi-layered coatings, specifically designed and optimized for solar thermal applications, particularly within high vacuum flat collectors at temperatures up to 200°C. We employed a MATLAB script, underpinned by the transfer matrix method, to calculate the hemispherical emissivity. The calculated emissivity values aligned well with experimental measurements derived from sputter-deposited samples. Our findings underscore the efficacy of the designed multi-layered coatings in relation to their thermal emissivity characteristics, thus highlighting their potential for solar thermal applications.
Hemispherical Emittance in Multilayer Solar Absorbers: A MATLAB-Based Approach for Optimizing Solar Thermal Efficiency
Gaudino E.;Caldarelli A.;De luca D.;Farooq U.;Strazzullo P.;Di Gennaro E.;Musto M.;Russo R.Ultimo
2024
Abstract
The thermal emissivity of selective solar absorbers is a critical determinant of their operational efficiency. This paper details the computation of hemispherical emissivity for multi-layered coatings, specifically designed and optimized for solar thermal applications, particularly within high vacuum flat collectors at temperatures up to 200°C. We employed a MATLAB script, underpinned by the transfer matrix method, to calculate the hemispherical emissivity. The calculated emissivity values aligned well with experimental measurements derived from sputter-deposited samples. Our findings underscore the efficacy of the designed multi-layered coatings in relation to their thermal emissivity characteristics, thus highlighting their potential for solar thermal applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
