一种水流质型光伏光热综合利用系统的设计

Design on a Kind of Photovoltaic-Thermal Utilization System with Water as Working Fluid

为进一步提高光伏组件与水的换热效率,设计了一套扁集热管结构的水流质型光伏光热(PVT)综合利用系统,并分别在3种工况下进行了连续8 h的温度与效率的跟踪测试,得出组件的温度特性与功率特性的变化情况、毛的光热转换效率、水泵产生的附加热效应。在排除水泵工作产生的附加热效应后,得到该系统的净光热转换效率与净总效率随保温桶水温的变化曲线。净光热转换效率与净总效率都随着保温桶水温的变化(或工作时间的延长)先升后降,存在一个极大值点,分别为70.31%与73.23%。8 h总的净光热转换效率为55.9%,总光电转换效率为2.74%,总能量利用率为58.64%。与相关文献比较,光热转换效率很高,光电转换效率很低,对此现象进行了分析,并对应用市场进行评价。

In order to improve the heat transfer efficiency between the photovoltaic component and water,a flat tube photovoltaic-thermal（ PVT） comprehensive utilization system is designed,with water as working fluid. The temperature and efficiency tracking tests for continuous 8 hours are performed in three kinds of working conditions. The data,such as temperature and power characteristics of component,gross photo-thermal conversion efficiency,and the additional heat effect produced by pump,are obtained. Changing with of water temperature in heat insulation barrel,the net thermal efficiency and the net total efficiency of the system are gained,eliminating the additional thermal effect generated by water pump. The net thermal efficiency and the net total efficiency both change with the water temperature in the heat insulation barrel（ or change with time）. Both of them increase firstly and then decrease,so there are maxima of 70.31% and 73. 23%,respectively. In 8 hours,the overall photo-thermal conversion efficiency is 55. 9%,the overall photoelectric conversion efficiency is 2. 74%,and the overall energy efficiency is 58. 64%. Compared with related literatures,the photo-thermal conversion efficiency is higher,and the photoelectric conversion efficiency is lower. This phenomenon is analyzed and the application market is evaluated in this article.