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A Selective Solar Absorber for Unconcentrated Solar Thermal Panels

Author

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  • Davide De Maio

    (Industrial Engineering Department, University of Napoli “Federico II”, 80126 Napoli, Italy
    National Research Council of Italy, Napoli Unit, Institute of Applied Sciences and Intelligent Systems, 80131 Napoli, Italy
    These authors contributed equally to this work.)

  • Carmine D’Alessandro

    (Industrial Engineering Department, University of Napoli “Federico II”, 80126 Napoli, Italy
    National Research Council of Italy, Napoli Unit, Institute of Applied Sciences and Intelligent Systems, 80131 Napoli, Italy
    These authors contributed equally to this work.)

  • Antonio Caldarelli

    (Industrial Engineering Department, University of Napoli “Federico II”, 80126 Napoli, Italy
    National Research Council of Italy, Napoli Unit, Institute of Applied Sciences and Intelligent Systems, 80131 Napoli, Italy)

  • Daniela De Luca

    (National Research Council of Italy, Napoli Unit, Institute of Applied Sciences and Intelligent Systems, 80131 Napoli, Italy
    Physics Department, University of Napoli “Federico II”, 80126 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)

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.

Suggested Citation

  • Davide De Maio & Carmine D’Alessandro & Antonio Caldarelli & Daniela De Luca & Emiliano Di Gennaro & Roberto Russo & Marilena Musto, 2021. "A Selective Solar Absorber for Unconcentrated Solar Thermal Panels," Energies, MDPI, vol. 14(4), pages 1-13, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:900-:d:496211
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    References listed on IDEAS

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    Cited by:

    1. De Luca, Daniela & Strazzullo, Paolo & Di Gennaro, Emiliano & Caldarelli, Antonio & Gaudino, Eliana & Musto, Marilena & Russo, Roberto, 2023. "High vacuum flat plate photovoltaic-thermal (HV PV-T) collectors: Efficiency analysis," Applied Energy, Elsevier, vol. 352(C).
    2. Ehab AlShamaileh & Iessa Sabbe Moosa & Heba Al-Fayyad & Bashar Lahlouh & Hussein A. Kazem & Qusay Abu-Afifeh & Bety S. Al-Saqarat & Muayad Esaifan & Imad Hamadneh, 2022. "Performance Comparison and Light Reflectance of Al, Cu, and Fe Metals in Direct Contact Flat Solar Heating Systems," Energies, MDPI, vol. 15(23), pages 1-15, November.
    3. Henok G. Gebretinsae & Meresa G. Tsegay & Giday G. Welegergs & Malik Maaza & Zebib Y. Nuru, 2022. "Effect of Rotational Speed on the Structural, Morphological, and Optical Properties of Biosynthesized Nickel Oxide Thin Films for Selective Solar Absorber Nanocoatings," Energies, MDPI, vol. 15(23), pages 1-18, November.

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