两级透射-反射聚光分频电热联产系统设计和分析

在传统聚光条件下的太阳能光伏发电系统中，由于太阳光中存在所有波段的光子，而其中只有一部分能够被太阳电池用来发电，其余的部分进入太阳电池之后非但不会被用于发电，反而会变成热量使太阳电池升温，从而使电池光电转换效率下降．本文设计了一种聚光且具有分频功能的太阳能电热联产系统，利用线聚焦菲涅尔透镜和光谱选择性透过涂层改善太阳电池表面的入射光环境，在聚光的同时将不利于光伏发电的太阳光波段反射并加以收集利用．分析结果表明，与相同条件下传统的只进行聚光的光伏系统相比，两级透射一反射聚光分频电热联产系统具有更高的太阳能利用效率．

Design and analysis of two-stage transmitted-reflected concentration PV/thermal system with spectral beam splitter

For the traditional photovoltaic (PV) system which is under a full spectral concentrating condition, only a part of solar energy can be used by solar cells for PV power generation, the other part is not effective for the PV power generation and can result in temperature of solar cells increasing. High temperature can reduce the PV transformation efficiency of solar cells. In this study, a concentration PV/thermal system with beam splitter is proposed, which is composed of a linear Fresnel lens, a concave lens, a beam splitter, solar cells and a thermal receiver. The selective transmission coating on the splitter is designed to improve the incident condition of the sunlight on the surface of solar cells and reflect the noneffective part of sunlight to the thermal receiver for recycling. Theoretical analysis of the PV/thermal system is made and the results show that compared with the traditional concentration PV system, the two-stage transmitted- reflected concentration spectral beam splitting PV/thermal system has a high efficiency.