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Formulation of an Efficiency Model Valid for High Vacuum Flat Plate Collectors

Author

Listed:
  • Eliana Gaudino

    (Industrial Engineering Department, University of Napoli “Federico II”, Piazzale Vincenzo Tecchio 80, 80125 Napoli, Italy
    Institute of Applied Sciences and Intelligent Systems, National Research Council of Italy, via Pietro Castellino 111, 80131 Napoli, Italy)

  • Antonio Caldarelli

    (Industrial Engineering Department, University of Napoli “Federico II”, Piazzale Vincenzo Tecchio 80, 80125 Napoli, Italy
    Institute of Applied Sciences and Intelligent Systems, National Research Council of Italy, via Pietro Castellino 111, 80131 Napoli, Italy)

  • Roberto Russo

    (Institute of Applied Sciences and Intelligent Systems, National Research Council of Italy, via Pietro Castellino 111, 80131 Napoli, Italy)

  • Marilena Musto

    (Industrial Engineering Department, University of Napoli “Federico II”, Piazzale Vincenzo Tecchio 80, 80125 Napoli, Italy
    Institute of Applied Sciences and Intelligent Systems, National Research Council of Italy, via Pietro Castellino 111, 80131 Napoli, Italy)

Abstract

High Vacuum Flat Plate Collectors (HVFPCs) are the only type of flat plate thermal collectors capable of producing thermal energy for middle-temperature applications (up to 200 °C). As the trend in research plans is to develop new Selective Solar Absorbers to extend the range of HVFPC application up to 250 °C, it is necessary to correctly evaluate the collector efficiency up to such temperatures to predict the energy production accurately. We propose an efficiency model for these collectors based on the selective absorber optical properties. The proposed efficiency model explicitly includes the radiative heat exchange with the ambient, which is the main source of thermal losses for evacuated collectors at high temperatures. It also decouples the radiative losses that depend on the optical properties of the absorber adopted from the other thermal losses due to HVFPC architecture. The model has been validated by applying it to MT-Power HVFPC manufactured by TVP-Solar. The dissipative losses other than thermal radiation were found to be mostly conductive with a linear coefficient k = 0.258 W/m 2 K. The efficiency model has been also used to predict the energy production of HVFPCs equipped with new, optimized Selective Solar Absorbers developed in recent years. Considering the 2019 meteorological data in Cairo and an operating temperature of 250 °C, the annual energy production of an HVFPC equipped with an optimized absorber is estimated to be 638 kWh/m 2 .

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:22:p:7650-:d:1282972
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    References listed on IDEAS

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    4. 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).
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