平板型光伏/光热系统高效换热数值模拟研究

The traditional PV/T system has been reported with poor heat transfer performance and non- uniform PV temperature distribution respectively. In this study, the pipe-plate structure in PV/T collector was employed with mechanical reinforcement to reduce the thermal resistance at the junction. Three kinds of absorber pipe layouts including serpentine pipe, unidirectional spiral pipe and bidirectional spiral pipe were proposed and evaluated with numerical simulation under various working conditions. The results showed that the system exhibited the best thermal behavior at a flow rate of 90 L/h and solar radiation of 800 W/m² and the thermal efficiency can reach 71.5%. Different absorber pipe layouts had little effect on the thermal efficiency and PV average temperature. However, the bidirectional spiral pipe in which the cold and hot flows were alternately arranged can significantly improve the uniformity of PV temperature distribution, and the maximum temperature non-uniformity of PV can be reduced by 37.5%.