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A parametric study on the performance characteristics of an evacuated flat-plate photovoltaic/thermal (PV/T) collector

Author

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  • Hu, Mingke
  • Guo, Chao
  • Zhao, Bin
  • Ao, Xianze
  • Suhendri,
  • Cao, Jingyu
  • Wang, Qiliang
  • Riffat, Saffa
  • Su, Yuehong
  • Pei, Gang

Abstract

An evacuated flat-plate photovoltaic/thermal (E-PV/T) collector was proposed. The inner space of the E-PV/T collector is vacuumed to suppress non-radiative heat losses, thus increasing thermal efficiency of the collector. Therefore, the E-PV/T collector has the potential to simultaneously deliver electricity and heat at high temperatures. A mathematic model was developed to evaluate the performance of the E-PV/T collector. The effect of some key parameters (e.g., initial water temperature in the water tank, vacuum degree, long-wave panel emissivity, and temperature coefficient of solar cells) on the performance of the E-PV/T system was investigated and the results were compared with a normal flat-plate PV/T (N-PV/T) system. Results suggest that the vacuum helps to enhance the total efficiency by nearly 10% points in high-temperature conditions (>80 °C). The vacuum degree of the upper space exerts a greater effect on system efficiencies compared to that of the lower space. Lower long-wave panel emissivity and greater temperature coefficient of the solar cell promote the performance of the collector. By lowering the long-wave panel emissivity from 0.95 to 0.05, the total efficiency soars from 26.82% to 61.20%. This study may help to guide parametric optimization and operation strategy of flat-plate PV/T collectors for high-temperature applications.

Suggested Citation

  • Hu, Mingke & Guo, Chao & Zhao, Bin & Ao, Xianze & Suhendri, & Cao, Jingyu & Wang, Qiliang & Riffat, Saffa & Su, Yuehong & Pei, Gang, 2021. "A parametric study on the performance characteristics of an evacuated flat-plate photovoltaic/thermal (PV/T) collector," Renewable Energy, Elsevier, vol. 167(C), pages 884-898.
    • Handle: RePEc:eee:renene:v:167:y:2021:i:c:p:884-898
    DOI: 10.1016/j.renene.2020.12.008
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