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Performance analysis of evacuated solar thermal panels with an infrared mirror

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  • D’Alessandro, Carmine
  • De Maio, Davide
  • Musto, Marilena
  • De Luca, Daniela
  • Di Gennaro, Emiliano
  • Bermel, Peter
  • Russo, Roberto

Abstract

Reducing thermal losses in solar thermal devices is fundamental for enhancing conversion efficiencies, particularly at high operating temperatures. In this work, we consider the benefits of adding an InfraRed (IR) mirror coating to the inner surface of the glass encapsulating a High Vacuum insulated Flat Plate solar thermal Panel (HVFP). The IR mirror helps recover the radiation emitted by the absorber by sending it back to the absorber itself. This mechanism, known as cold-side external photon recycling, allows a reduction of radiative losses and, consequently, an improvement of the panel efficiency. The performance of the structure presented in this manuscript is studied via a thermal model. A detailed discussion on the increasing efficiency is presented, and results are presented by taking into account different parameters, like the mirror transparency, reflectivity and reflection bandwidth, as well as different operating temperatures of the panel. Finally, the annual energy gain associated with the IR mirror is analyzed in the case of three different cities, using historical data, showing that improvement higher than 50% can be obtained at operating temperatures above 300 °C.

Suggested Citation

  • D’Alessandro, Carmine & De Maio, Davide & Musto, Marilena & De Luca, Daniela & Di Gennaro, Emiliano & Bermel, Peter & Russo, Roberto, 2021. "Performance analysis of evacuated solar thermal panels with an infrared mirror," Applied Energy, Elsevier, vol. 288(C).
    • Handle: RePEc:eee:appene:v:288:y:2021:i:c:s0306261921001410
    DOI: 10.1016/j.apenergy.2021.116603
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    References listed on IDEAS

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    1. Moss, R.W. & Henshall, P. & Arya, F. & Shire, G.S.F. & Hyde, T. & Eames, P.C., 2018. "Performance and operational effectiveness of evacuated flat plate solar collectors compared with conventional thermal, PVT and PV panels," Applied Energy, Elsevier, vol. 216(C), pages 588-601.
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    4. Mohamad, Khaled & Ferrer, P., 2019. "Parabolic trough efficiency gain through use of a cavity absorber with a hot mirror," Applied Energy, Elsevier, vol. 238(C), pages 1250-1257.
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    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. Gao, Datong & Zhong, Shuai & Ren, Xiao & Kwan, Trevor Hocksun & Pei, Gang, 2022. "The energetic, exergetic, and mechanical comparison of two structurally optimized non-concentrating solar collectors for intermediate temperature applications," Renewable Energy, Elsevier, vol. 184(C), pages 881-898.
    3. Fan, Ruijin & Wan, Minghan & Zhou, Tian & Zheng, Nianben & Sun, Zhiqiang, 2024. "Graphene-enhanced phase change material systems: Minimizing optical and thermal losses for solar thermal applications," Energy, Elsevier, vol. 289(C).
    4. Eliana Gaudino & Antonio Caldarelli & Roberto Russo & Marilena Musto, 2023. "Formulation of an Efficiency Model Valid for High Vacuum Flat Plate Collectors," Energies, MDPI, vol. 16(22), pages 1-12, November.

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