空间太阳电池槽式聚光热电联供系统特性分析

Investigation of Performance on Trough Concentrating Solar Photovoltaic/Thermal System Based on Super Cells

建立了空间太阳电池的热电联供系统在槽式聚光条件下的热电性能模型,并与实验进行了对比。理论计算与实验结果吻合较好,最大误差在5.1%以内,证明了该数学模型的正确性。通过此数学模型,从聚光镜面的光学效率与焦线宽度、导热胶的导热系数、金属平板光照面的吸收率等内部特性参数及风速、太阳直辐射等外部特性参数出发,对所设计制造的空间太阳电池槽式聚光热电联供系统进行分析。较为全面而系统地分析了这些参数的改变对其系统的热电效率、总效率及火用效率等性能指标的影响,其中聚光镜面的光学效率影响最大,光学效率从0.5增加至0.95,系统的总效率和火用效率分别增加0.9倍和0.5倍,其余参数对性能也有较强影响。研究结果为新一轮系统装置的制作提供了优化设计基础。

A mathematic model of a trough concentrating solar PV/T system has been established and verified with experimental data. The calculation based on the model is agreeable with experimental results, the errors between calculations and experiments are less than 5%, which indicates that the model is valid. Through the model, the performance of the trough concentrating solar PV/T system based on super cells is analyzed systematically with internal and external parameters of PV/T system. The internal parameters include optical efficiency of mirror, width of focusing line, thermal conductivity of heat sinking tape and thermal absorption of the lighting plate, while the external parameters include the wind speed and the solar direct radiation. A large number of simulations were undertaken to test the thermal, electricity, total and exergy efficiency of PV/T system for variation of the design parameters. The result indicates that the optical efficiency of mirror has more effect on the performance of system than others, the total and exergy efficiency increase 0.9 times and 0.5 times respectively with the optical efficiency of mirror increasing from 0.5 to 0.95. Other parameters also have strong effects on the performance of system, All these works benefit to further study in optimization design of the system.