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Abstract

The working temperature of the crystalline silicon photovoltaic (PV) module seriously restricts the cell efficiency and the module lifetime. Therefore, it is of great significance to investigate the cooling effects of PV modules. Recently, introducing nanostructures into polymer backsheets to obtain direct-cooling effects due to enhanced heat conduction and radiation characteristics, has become a new trend for PV cooling technology. In this paper, we study the backside thermal properties of the PV module by combining the energy balance equation and optical simulations. The thermal power and cooling effect are calculated and compared between the standard backsheet and three types of direct-cooling backsheets for three typical ambient temperatures. The structure parameters and encapsulating mode of mainstream commercial silicon cells are adopted in the simulations and calculations. The influences of thermal parameters, i.e, the heat transfer coefficient and the emissivity, on the thermal process and the operating temperature are discussed in detail. We hope that this study may provide a certain reference for the future design of PV-direct-cooling backsheets.

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Authors and contacts

Corresponding author:Sun Hua,hsun@suda.edu.cn; Su Xiao-Dong,xdsu@suda.edu.cn

Funds:Project supported by the Key University Science Research Project of Jiangsu Province, China (Grant No. 16KJA140002), the Postgraduate Research & Practice Innovation Program of Jiangsu Province, China (Grant No. KYCX19_1967), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), China

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名称	发射率$ {\varepsilon }_{\rm{back}} $	传热系数$ {h}_{2}{/({\rm{W}}\cdot {\rm{m}}}^{-2}\cdot {\rm{K}}^{-1}) $
标准背板O	$ {\overline{\varepsilon }}_{\rm{back}} $	$ {h}_{2}^{\rm{s}} $
直冷背板A	$ {\overline{\varepsilon }}_{\rm{back}} $	$ {h}_{2}^{*} $
直冷背板B	$ {\varepsilon }_{\rm{back}}^{*} $	$ {h}_{2}^{\rm{s}} $
直冷背板C	$ {\varepsilon }_{\rm{back}}^{*} $	$ {h}_{2}^{*} $

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背板类型	T_a= 10 ℃		T_a= 25 ℃		T_a= 50 ℃
背板类型	$ {T}_{\rm{PV}}/ $℃	$ \eta / $%	$ {T}_{\rm{PV}}/ $℃	$ \eta / $%	$ {T}_{\rm{PV}}/ $℃	$ \eta / $%
标准背板O	31.2	19.62	44.7	18.41	67.1	16.39
直冷背板A	27.5	19.96	41.4	18.71	64.4	16.63
直冷背板B	30.4	19.63	43.9	18.48	66.4	16.45
直冷背板C	26.9	20.01	40.9	18.75	63.9	16.68

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Vol. 70, Issue 9 - 2021-05-05

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