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Flow and heat transfer in the air gap behind photovoltaic panels

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  • Moshfegh, B.
  • Sandberg, M.

Abstract

The impetus of this paper is to analyse numerically and experimentally the flow and heat transfer characteristics of buoyancy-driven air convection behind photovoltaic panels. Both convection and radiation heat exchanges are considered as the heat transfer mechanisms by which the thermal energy is transferred into the air. Numerical and experimental results are obtained for a channel of 7.0 m in height and the channel walls are separated by a distance of 0.23 m. In the experiment heat is supplied to the air gap from heating foil attached to one of the vertical walls. Different input heat fluxes and emissivity of the bounding surfaces are considered in order to show their effect on the heat transfer across the air layer. Detailed studies of the flow and thermal fields in the air are presented in order to explore the thermal behaviour of the air in the channel. Velocity and temperature profiles of the outlet air and the surface temperature of the heated and insulated wall is presented. The numerical results agreed well with the experimental measurements.

Suggested Citation

  • Moshfegh, B. & Sandberg, M., 1998. "Flow and heat transfer in the air gap behind photovoltaic panels," Renewable and Sustainable Energy Reviews, Elsevier, vol. 2(3), pages 287-301, September.
    • Handle: RePEc:eee:rensus:v:2:y:1998:i:3:p:287-301
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    1. Moshfegh, B. & Sandberg, M., 1996. "Investigation of fluid flow and heat transfer in a vertical channel heated from one side by PV elements, part I - Numerical Study," Renewable Energy, Elsevier, vol. 8(1), pages 248-253.
    2. Sandberg, M. & Moshfegh, B., 1996. "Investigation of fluid flow and heat transfer in a vertical channel heated from one side by PV elements, part II - Experimental study," Renewable Energy, Elsevier, vol. 8(1), pages 254-258.
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    13. Ji, Jie & Liu, Keliang & Chow, Tin-tai & Pei, Gang & He, Wei & He, Hanfeng, 2008. "Performance analysis of a photovoltaic heat pump," Applied Energy, Elsevier, vol. 85(8), pages 680-693, August.
    14. D'Orazio, M. & Di Perna, C. & Di Giuseppe, E., 2014. "Experimental operating cell temperature assessment of BIPV with different installation configurations on roofs under Mediterranean climate," Renewable Energy, Elsevier, vol. 68(C), pages 378-396.
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    16. Spiliotis, Konstantinos & Gonçalves, Juliana E. & Saelens, Dirk & Baert, Kris & Driesen, Johan, 2020. "Electrical system architectures for building-integrated photovoltaics: A comparative analysis using a modelling framework in Modelica," Applied Energy, Elsevier, vol. 261(C).
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    20. Ma, Tao & Yang, Hongxing & Zhang, Yinping & Lu, Lin & Wang, Xin, 2015. "Using phase change materials in photovoltaic systems for thermal regulation and electrical efficiency improvement: A review and outlook," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 1273-1284.

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