通过在太阳能集热器中添加饱和式脂肪酸相变材料，对太阳能光伏光热系统的不同热调控策略开展了实验研究。分析集热器中通水和不通水两种热调控策略对系统能量利用的影响。结果表明：相变材料可有效降低光伏板温度，但两种热调控策略下相变材料存在明显的温度分层现象；与不通水策略相比，通水策略在强化系统换热的同时促进了更多余热的回收，不通水和通水策略的热效率分别为71.3%和77.1%；通水策略可以更加有效地降低光伏板温度，缓解相变材料过热的影响，光电转化效率提高了7.3%。

With the adoption of the phase change material (PCM) of saturated fatty acids in a solar collector,the detailed experimental studies of different thermal regulation strategies were carried out in a solar photovoltaic/thermal (PV/T) system.The influence of two thermal regulation strategies,i.e.,with and without water flow in the solar collector,on the energy utilization of the system,was analyzed in detail.The experimental results indicated that PCM can effectively reduce the temperature of the PV panel,but there is still a significant temperature stratification in PCM under the two thermal control strategies.In comparison with the strategy without waterflow,the waterflow strategy promotes the recovery of more waste heat while enhancing the heat exchange of the system.Without and with the waterflow strategies,their thermal efficiencies are 71.3% and 77.1%,respectively.The waterflow strategy can effectively decrease the temperature of the PV panel and alleviate the overheating of the PCM.Accordingly,the photoelectric conversion efficiency is increased by 7.3%.

TK123

国家重点研发计划（2018YFF0216000）；上海市自然科学基金（20ZR1438700）；上海市国际科技合作基金(18160743600）