Design of Fresnel lens with high efficiency short focal length and large size

Abstract:

In order to reduce the area of solar cell, minimize the size and cut down the cost of the concentrator solar system, the partitioning method is adopted to design a Fresnel lens with high efficiency, short focal length and high concentrator ratio. The large round or square size Fresnel lens is separated into three parts: the central area, refractive area and total refractive area, and the computational equations of partitioning method are derived. A Fresnel lens is designed through this method, whose focal length and diameter ratio is 0.75 and concentration ratio is high up to 1000. TracePro simulation shows that the light concentrating efficiency of the designed Fresnel lens can be up to 88.75％. The Fresnel lens designed through partitioning method possesses the advantages of high optical efficiency, high concentration ratio and short focal length, and the cost and weight of concentrator solar cells system can be reduced.