液浸聚光光伏系统中液体光谱透过率的分析

Spectral Transmittance Analysis of Immersion Liquid for Cooling Concentrating Photovoltaic System

采用液浸冷却方式的聚光光伏系统中液体层的存在会改变入射到电池表面的光强与光谱分布,因此准确测量液浸液体的光谱透过率非常重要.通过分光光度计对去离子水、异丙醇、乙酸乙酯和二甲基硅油候选液体进行了检测,然后用光度学的方法修正得出了候选液体的真实光谱透过率.与传统封装太阳电池材料的光谱透过率相比,这4种液浸液体的透过率要高.基于浸没硅太阳电池的归一化光电流密度分析得出二甲基硅油导致的功率损失最小,去离子水引起的损失最大,后者要比前者多5%左右.

With liquid-immersion cooling used for concentrating photovoltaic（CPV）systems,the intensity and spec-tral range of the incident sunlight on the CPV cells would change.Therefore,the accurate measurement of the spec-tral transmittance of the candidate immersion liquids is very important.The spectral transmittances of de-ionised（DI）water,isopropyl alcohol（IPA）,ethyl acetate,and dimethyl silicon oil were measured through spectro-photometer.The real spectral transmittance was obtained by determining respective correction factors based on the developed photometry correction method.The spectral transmittances of the four candidate liquids were proved to be higher than that of conventional PV encapsulants.The calculated normalized photocurrent density of silicon solar cell indicated that dimethyl silicon oil immersion would cause the smallest power loss,while the largest loss occured with DI water.The power loss of the latter one was around 5% more than that of the former one.