高倍聚光光伏光热一体化系统的热电性能研究

STUDY ON THERMOELECTRIC PERFORMANCE OF HIGH-POWER CONCENTRATION PHOTOVOLTAIC AND THERMAL INTEGRATED SYSTEM

依据聚光光伏光热一体化系统能量传递守恒过程,建立相对应的理论模型,通过仿真计算对系统进行热电性能总体评价,在此基础上搭建高倍聚光光伏光热一体化系统实验台,进行实际光照条件下的热电测试和验证,并分析冷却水流量的影响。结果表明:实验系统发电效率为26.2%,总能利用率为75.4%,所建立的理论模型可近似评价系统热电性能;系统开路电压和短路电流分别受冷却水温度和光照强度的影响;冷却水流量对系统热利用效率、发电效率及㶲效率影响较大,需依据不同需求决定高倍聚光光伏光热系统的控制策略。

According to the energy transfer and conservation process of the high-power concentration photovoltaic photo themal integrated system,the corresponding theoretical model is established,and the thermal performance of the system is evaluated by simulation calculation. On this basis,a high-power concentration photovoltaic phatothermal integrated system experimental platform is built to test and verify the thermal performance under the actual illumination conditions,and the impact of cooling water flow rate is analyzed. The results show that the power generation efficiency of the experimental system is 26.2% and the total energy utilization rate is 75.4%. The theoretical model can approximately evaluate the thermoelectric performance of the system;the open-circuit voltage and short-circuit current of the system are respectively affected by the temperature of cooling water and the intensity of illumination;the cooling water flow rate has a greater impact on the thermoelectric efficiency and the exergy efficiency of the system,so the control strategy of high power concentrating photovoltaic photothermal system should be adjusted according to different needs.