A Selective Solar Absorber for Unconcentrated Solar Thermal Panels

Davide De Maio, Carmine D’Alessandro, Antonio Caldarelli, Daniela De Luca, Emiliano Di Gennaro, Roberto Russo and Marilena Musto
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Davide De Maio: Industrial Engineering Department, University of Napoli “Federico II”, 80126 Napoli, Italy
Carmine D’Alessandro: Industrial Engineering Department, University of Napoli “Federico II”, 80126 Napoli, Italy
Antonio Caldarelli: Industrial Engineering Department, University of Napoli “Federico II”, 80126 Napoli, Italy
Daniela De Luca: National Research Council of Italy, Napoli Unit, Institute of Applied Sciences and Intelligent Systems, 80131 Napoli, Italy
Emiliano Di Gennaro: Physics Department, University of Napoli “Federico II”, 80126 Napoli, Italy
Roberto Russo: National Research Council of Italy, Napoli Unit, Institute of Applied Sciences and Intelligent Systems, 80131 Napoli, Italy
Marilena Musto: Industrial Engineering Department, University of Napoli “Federico II”, 80126 Napoli, Italy

Energies, 2021, vol. 14, issue 4, 1-13

Abstract: A new Selective Solar Absorber, designed to improve the Sun-to-thermal conversion efficiency at mid temperatures in high vacuum flat thermal collectors, is presented. Efficiency has been evaluated by using analytical formulas and a numerical thermal model. Both results have been experimentally validated using a commercial absorber in a custom experimental set-up. The optimization procedure aimed at obtaining Selective Solar Absorber is presented and discussed in the case of a metal dielectric multilayer based on Cr 2 O 3 and Ti. The importance of adopting a real spectral emissivity curve to estimate high thermal efficiency at high temperatures in a selective solar absorber is outlined. Optimized absorber multilayers can be 10% more efficient than the commercial alternative at 250 ° C operating temperatures, reaching 400 ° C stagnation temperature without Sun concentration confirming that high vacuum flat thermal collectors can give important contribution to the energy transition from fossil fuels to renewable energy for efficient heat production.

Keywords: thermal emittance; conversion efficiency; selective solar absorber; thermal energy; evacuated flat panel; solar energy (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 (3)

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