新型线聚焦菲涅耳透镜设计及其聚光特性研究

A NEW TYPE LINEAR FRESNEL LENS DESIGN AND CONCENTRATING CHARACTERISTIC ANALYSIS

聚光光伏系统中电池表面热流密度分布不均匀导致系统光电转换效率降低,同时出现局部过热问题,严重影响了光伏电池系统的效率。为了解决这一问题,本文设计了一种可以使太阳投射辐射能量均匀化分布于接收面的新型线聚焦菲涅耳透镜,并运用蒙特卡罗光线追迹法对常见的菲涅耳透镜及本文设计新型线聚焦菲涅耳透镜的聚光特性进行了对比研究。模拟结果表明,新型透镜极大地改善了电池表面热流分布的均匀性。针对新型透镜聚光特性,考察了不同设计接受面宽度、太阳光不平行灾角、入射光束波长、入射光倾角及电池位置等因素对电池表面热流密度分布的影响。

In the photovoltaic system,non-uniform heat flux distribution of the solar cell will lead to a reduced function of photoelectric conversion efficiency and significant local heating which lower the efficiency of the PV power generation.To solve this problem,a new type linear Fresnel lens had been promoted in this paper to make the uniform distribution.Then the Monte Carlo ray tracing method had been applied to analyze the concentrating characteristic of the linear Fresnel lens.The simulation result shows that the new type Lens significantly improves the uniformity of the heat flux distribution.At last,some influencing factors of the concentrating characteristics,such as absorber length,unparallel sun light,the wavelength of the incidence light,incidence angle,the position of solar cell,and so on,had been researched with Monte Carlo ray tracing method.