玻璃盖板与光伏板间距对PV/T系统性能的影响

Influence of Distance between Glass Cover Plate and Photovoltaic Panels on Performance of PV/T System

通过对PV/T系统中的光伏板和玻璃盖板进行热平衡分析,探讨光伏板与玻璃盖板之间的板间距对PV/T系统光热效率的影响。根据天津地区典型年气象参数,计算出在不同的板间距不同光伏板温度的情况下,PV/T系统中光伏板散热量和光热效率,对计算结果进行分析。随着板间距变大,PV/T系统的光热效率开始快速升高,达到极大值后随着板间距继续增加,光热效率有所下降,下降到一定程度后又有所上升。PV/T系统中光伏板散热量的变化趋势与此相反。对所分析的两种光伏板温度(40℃、50℃),最佳板间距随着光伏板温度的升高而减小。当光伏板的温度控制在40℃时最佳板间距为6 cm,当光伏板的温度控制在50℃时最佳板间距为5 cm。由于调节板间距容易实现,所以选择合适的板间距对提高PV/T系统的光热效率有实用价值。

Through the thermal equilibrium analysis of photovoltaic panels and glass cover plate in PV/T system,the influence of the distance between photovoltaic panels and glass cover plate on the photo-thermal efficiency of PV/T system is discussed.According to the typical annual meteorological parameters in Tianjin,the heat dissipation and photo-thermal efficiency of photovoltaic panels in PV/T system are calculated under different distances between the panels and the plate and different photovoltaic panels temperatures,and the calculation results are analyzed.As the distance between the panels and the plate becomes larger,the photo-thermal efficiency of the PV/T system begins to increase rapidly.After reaching the maximum value,as the distance between the panels and the plate continues to increase,the photo-thermal efficiency decreases,and decreases to a certain extent and then increases.The trend of heat dissipation of photovoltaic panels in PV/T system is reversed.For the two photovoltaic panel temperatures(40℃and 50℃),the optimum distance between the panels and the plate decreases as the photovoltaic panel temperature increases.The optimum distance between the panels and the plate is 6 cm when the photovoltaic panel temperature is controlled at 40℃,and the optimum distance between the panels and the plate is 5 cm when the photovoltaic panel temperature is controlled at 50℃.Since the adjustment of distance between the panels and the plate can be easily realized,selecting a suitable distance between the panels and the plate has practical value for improving the photo-thermal efficiency of the PV/T system.