基于平板型导光板的太阳能聚光系统

Sollar Concentrating System Based on Planar Waveguide

针对传统线性聚光系统聚光光斑辐照度不均匀的问题,提出了一种由曲面线聚焦菲涅耳聚光器阵列及平板型导光板所组成的、系统高度小于40mm的小体积聚光系统方案,建立了曲面线聚焦菲涅耳透镜的一般方程,给出导光板V形槽设计公式,并采用正交试验法和光学仿真实验对聚光器系统的各项结构参数进行优化设计,同时分析了曲面线聚焦菲涅耳的加工误差及导光板安装偏角误差的影响。结果表明:优化后系统在采光面积500mm×200mm、聚光比50倍时,聚光效率可达75%,聚焦光斑均匀性优于88%,且入射太阳光偏角在±7°内聚光效率大于50%。通过拼接可获得不同聚光倍数系统,由仿真实验得出在160倍聚光比内,效率高于50%,均匀性优于85%。

A solar concentrating system is designed to solve the nonuniform illumination distribution problem of the flares through traditional concentrating systems with line focus.This concentrator system consists of curved cylindrical Fresnel lens array and a planar waveguide.A general formula of curved Fresnel with line focus and the design formula of the V-groove of the waveguide are presented.The system is in a small volume,with the total height less than 40 mm.Through orthogonal test and optical simulation,structure parameters of the system are optimized.Meanwhile,the influences of the machining error of the curved line focus Fresnel lenses and the installation error of the waveguide are discussed.It turns out that the optical efficiency of the optimized system with a lighting area of 500 mm×200 mm in the condition of 50× geometric concentration is about 75% and the illumination uniformity is above 88%.Simultaneously the optical efficiency is over 50% within ±7° declination angle of the incident light.Different concentration can be reached by splicing and it is proved by simulation that the optical efficiency is above 50% and the uniformity is more than 85% within 160× concentration.