冷却剂流量对聚光型太阳能光伏系统效率的影响

The Influence of Coolant Flow on the Efficiency of Concentrated Solar Photovoltaic System

针对聚光型太阳能光伏电池工作中温度升高会导致发电效率降低的问题,在太阳能模组上铺设有机工质循环管路对光伏电池进行冷却,通过冷凝器对管内有机工质吸收的热量进行收集利用,构建聚光型太阳能光伏/光热综合利用系统。建立传热模型,计算不同日照强度下模组的输出效率并与实验数据进行对比。实验结果表明:发电效率随日照强度的增加先增加后减小;对光伏电池进行冷却可提升系统输出效率;太阳能光伏发电及散热量利用效率合计可达60%。

A scenario is carried out to solve the problem of the rising temperature in concentrated photovoltaic solar cells which leads to efficiency reduction. Circulation pipes with organic working medium are placed on the concentrated solar modules to cool down photovoltaic cells. The condenser is used to collect the heat which is absorbed by the organic working fluid. The comprehensive utilization system of concentrated solar photovoltaic/thermal energy is then established. The heat transfer model is built to calculate the output efficiency under different conditions of sunlight intensity. The results are compared with the experimental data as verification. The experimental results show that the power generation efficiency will increase firstly,and then decrease with the increase in sunlight intensity. Cooling down photovoltaic cells can improve the system output efficiency,and the overall efficiency of solar photovoltaic power generation and heat release utilization can reach as high as 60%.