喷雾冷却下高倍聚光光伏光热“光-电-热”的耦合特性及机理研究

近年来高倍聚光光伏技术发展迅猛，但由于聚光能流密度分布及温度场分布的双重影响，其系统效率仍然不高。本项目针对高倍聚光光伏中“光-电-热”三者耦合影响的特点，在光电转换上，研究聚光辐照及温度耦合影响下光伏的温度特性及光照特性，揭示两者对光伏光电转换的非线性耦合影响规律，获得相应的I-V曲线修正模型；在光热转换上，结合喷雾冷却换热温差小、无接触热阻的特点，探索高热流密度下喷雾冷却在单相区及两相区的换热机理，研究对应流动换热下温度场的均匀性，获得喷雾冷却式高倍聚光光电光热转换复合模型。此外，本项目采用理论模拟与实验测试相结合的方法，对不同喷雾冷却参数特性及外部环境条件下高倍聚光光伏的换热特性及温度场均匀性等进行研究，给出喷雾冷却在单相区和两相区内热电匹配的性能评价，为高倍聚光光伏光电光热综合利用技术的发展提供指导性建议。

In recent years, concentrating photovoltaic technology developed rapidly, but the system is still not efficient because of the dual effects of concentrating energy flow density distribution and temperature field distribution. Considering the characteristics of "light-electric-heat" coupling in high-concentration photovoltaic, the temperature characteristics and illumination characteristics of photovoltaics under the influence of concentrating irradiation and temperature should be studied on the photoelectric conversion. The nonlinear coupling effect of photoelectric conversion is obtained, and the corresponding IV curve correction model is obtained. With the characteristics of small temperature difference and no contact thermal resistance of spray cooling in thermal conversion, the heat transfer mechanism of spray cooling in single-phase zone and two-phase zone is explored, and the temperature field corresponding to flow heat transfer is studied. Finally, a thermoelectric composite model of high concentration concentrating system based on spray cooling is established.. Furthermore, this project will investigate the following aspects by both numerical simulation and experimental method: the characteristics of different spray cooling parameters, the heat transfer characteristics of the photovoltaic system and the uniformity of temperature field under external environmental conditions, and a single or two phase zone performance evaluation of thermoelectric matching in the phase region will be given which provides guiding suggestions on the future application of the high concentrating photovoltaic/thermal system.