一种空气流质型光伏光热综合利用系统的实验研究

摘要

Under stable illumination conditions,consecutive 8 hours temperature and efficiency tracking tests for a self-design hybrid photovoltaic & thermal (PV/T) utilization system with air as working fluid have been carried out in three cases.After optimum selecting of air fan and water pump and elimination of heat radiation from them,the thermal efficiency and the total efficiency curves that change with water temperature in the insulation barrel are achieved.The thermal efficiency is not monotonous change,but increases after a decline,and then drops down again.Its initial change is quick.When the water temperature increases by 8.1 ℃ and thermal efficiency is about 16.90％,the thermal efficiency achieves the maximum point.Later,the temperature increases more and more slowly with time.Meanwhile,the thermal efficiency and total efficiency reduce gradually.But the electrical efficiency is basically unchanged.So the total efficiency changes similarly with the thermal one.The maximum of total efficiency is 18.81％,which is the best working point of the system.%在稳定的光照条件下,对自行设计的空气流质型光伏光热(PV/T)综合利用系统分别进行了在3种工况下的连续8h的温度与效率的跟踪测试.在确定了风泵与水泵的最佳工作档位,排除其自身生热的影响后,得到该空气流质型PV/T系统的热效率与总效率随保温桶水温的变化曲线.随着保温桶内水温的提高,热效率不是单调变化,而是先降后升再降,初期变化较快;当保温桶内水温上升8.1℃,热效率达到极大值(16.9％);然后,随着时间的增加,保温桶水温上升得越来越慢,热效率也越来越低,而电效率基本不变,总效率与热效率变化趋势基本一致.该系统最佳工作点的总效率为18.81％.