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Characteristics of heat dissipation from photovoltaic cells on the bottom wall of a horizontal cabinet to ambient natural convective air stream

Author

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  • Tsay, Y.L.
  • Cheng, J.C.
  • Hong, H.F.
  • Shih, Z.H.

Abstract

This study proposes a model to investigate the behaviors of natural convective cooling of photovoltaic cells mounted discretely on the bottom wall of a horizontal cabinet. The effects of Rayleigh number (Ra), dimensionless length of cabinet (Cx), ratio of cabinet wall to air thermal conductivities (Kef), number of photovoltaic cells (N), emissivity of metal wall (εe), and emissivity of glass lens (εg) are explored. Furthermore, the importance of thermal interaction between air streams inside and outside the cabinet through conducting wall are examined. The numerical computation domain covers the cabinet and surrounding area, so that the temperature and velocity fields of the combined regions are solved simultaneously. Results show that temperature differences among the photovoltaic cells can be up to 28% for all the investigated cases when 106 ≦ Ra ≦ 108, 5 ≦ Cx ≦ 12.5, 4 ≦ N ≦ 10, 1000 ≦ Kef ≦ 6300, 0 ≦ εe ≦ 0.5 and 0 ≦ εg ≦ 0.94. The maximum difference in hot spot temperatures of photovoltaic cells is about 26% among the cases with various Kef. In addition, the temperatures are rather low for the situation without consideration of thermal interaction between the air streams inside and outside the cabinet. Therefore, without the consideration of the thermal interaction would cause serious under-prediction for the hot spot temperatures of photovoltaic cells in engineering applications.

Suggested Citation

  • Tsay, Y.L. & Cheng, J.C. & Hong, H.F. & Shih, Z.H., 2011. "Characteristics of heat dissipation from photovoltaic cells on the bottom wall of a horizontal cabinet to ambient natural convective air stream," Energy, Elsevier, vol. 36(7), pages 3959-3967.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:7:p:3959-3967
    DOI: 10.1016/j.energy.2011.05.008
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    References listed on IDEAS

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    2. Li, Guanru & Hua, Qingsong & Sun, Li & Khosravi, Ali & Jose Garcia Pabon, Juan, 2023. "Thermodynamic modeling and optimization of hybrid linear concentrating photovoltaic and mechanically pumped two-phase loop system," Applied Energy, Elsevier, vol. 333(C).
    3. Sun, Yong & Wang, Yiping & Zhu, Li & Yin, Baoquan & Xiang, Haijun & Huang, Qunwu, 2014. "Direct liquid-immersion cooling of concentrator silicon solar cells in a linear concentrating photovoltaic receiver," Energy, Elsevier, vol. 65(C), pages 264-271.
    4. Wang, Y.N. & Lin, T.T. & Leong, J.C. & Hsu, Y.T. & Yeh, C.P. & Lee, P.H. & Tsai, C.H., 2013. "Numerical investigation of high-concentration photovoltaic module heat dissipation," Renewable Energy, Elsevier, vol. 50(C), pages 20-26.

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