CALCULATION MODEL AND ANALYSIS OF EFFECT OF PHOTOVOLTAIC ARRAY ON ROOF HEAT TRANSFER

Zhao Kang; Qin Yulin; Lyu Guoquan; Ge Jian

doi:10.19912/j.0254-0096.tynxb.2023-1699

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (2) : 333-341. DOI: 10.19912/j.0254-0096.tynxb.2023-1699

CALCULATION MODEL AND ANALYSIS OF EFFECT OF PHOTOVOLTAIC ARRAY ON ROOF HEAT TRANSFER

Zhao Kang^1,2, Qin Yulin^1,3, Lyu Guoquan¹, Ge Jian^1,2

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Abstract

Rooftop PV arrays have a significant impact on the roof’s heat transfer. A two-dimensional dynamic heat transfer model for PV array roofs is developed in order to measure the effects of direct solar radiation movement, sky background radiation, and horizontal heat transfer within the roof accurately. This model accounts for the real-time movement of the sun and the differences in radiation angle coefficients and the accuracy of the model is verified by experiments. The model is compared to existing one-dimensional node heat transfer models that overestimate the shading and heat dissipation blocking effects of the PV components. The results show that the two-dimensional dynamic model accurately calculates the heat transfer of PV roofs, yielding results closer to actual conditions. Furthermore, the results indicate that installing PV arrays with a 30° tilt angle on rooftops in regions with hot summers and cold winters can reduce the summer and winter typical day cooling and heating loads by 22.4% and 4.0%, respectively, with peak reductions of 35.9% and 16.7%. The peak times are delayed by approximately 40 minutes. Finally, the model serves as a tool to analyze the effects of tilt angle, spacing, roof insulation, and absorptivity on roof heat transfer and to propose optimal design suggestions.

Key words

PV arrays / roof / incident solar radiation / heat transfer / dynamic simulation

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Zhao Kang, Qin Yulin, Lyu Guoquan, Ge Jian. CALCULATION MODEL AND ANALYSIS OF EFFECT OF PHOTOVOLTAIC ARRAY ON ROOF HEAT TRANSFER[J]. Acta Energiae Solaris Sinica. 2025, 46(2): 333-341 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1699

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