扇形无漏光太阳能聚光器的设计方法

Design Method of Fan-Shaped Ray-Leakage-Free Solar Concentrator

建立了扇形无漏光聚光系统,对其几何聚光比与抛物线系数、聚光模组后抛物面宽度及聚光模组数量之间的相互关系进行了研究。针对光线耦合结构阵列后导致的漏光问题,提出了锯齿型无漏光波导板的设计方法,在提高聚光比的同时获得较高的聚光效率。通过分析太阳运行规律,提出可传动棱镜片组的设计以取代传统双轴跟踪方式,在一定意义上实现单轴追踪,降低系统运行功耗。在考虑菲涅耳损失以及材料吸收情况下,利用LightTools软件对所设计的聚光系统进行光线追迹,结果表明:在抛物线系数a=0.019时,几何聚光比达到1900,聚光效率为65.1%;在抛物线系数a=0.032时,几何聚光比达到1110,聚光效率达到约82.3%。

A novel fan-shaped ray-leakage-free solar concentrator is proposed.The relation of geometrical concentration ratio with parabola coefficient,posterior paraboloid width of concentration module and concentration module quantity is also explored.The proposed design method of the sawtooth ray-leakage-free lightguide can deal with the leaking situation after the coupling inlets array,which increases the optical efficiency and the concentration ratio.By the analysis of the sun tracking law,a single-axis tracker with the scrollable prism sheets is proposed instead of double-axes tracker,which can decrease the system power dissipation.The ray-tracing simulations are carried out by LightTools software considering the Fresnel loss and optical material absorption.The results show that the concentration ratio and optical efficiency are 1900 and 65.1% when the parabola coefficient is 0.019;the concentration ratio and optical efficiency are 1110 and 82.3% when the parabola coefficient is 0.032.