针对圆形吸收体提出了一种几何聚光比和可接收角同步提高的新型太阳能复合抛物聚光器(CPC),构建了新型CPC面形结构模型及数学解析解。对新型CPC的聚光性能进行了分析,并与常规CPC的光学性能进行了比较,结果表明:对于切线角相同的圆形吸收体新型CPC,随着圆形吸收体的直径增大时,面形起点的纵坐标值减小;当圆形吸收体直径和切线角分别为47 mm和5.56°时,面形起点的纵坐标为-29 mm;随着光口宽度角增大,新型CPC聚光器的几何聚光比减小,可接收角和平均光学效率随着光口宽度角的增大而增大;当光口宽度角为60°时,几何聚光比为1.16,可接收角为74.39°,平均光学效率为86.77%;新型CPC聚光器吸收体表面的能流分布较传统CPC更均匀。

In this paper, a solar compound-parabolic concentrator (CPC), with the simultaneous enhancement of the geometric concentrator ratio and the receiving angle for a circular absorber, is presented. Herein, the surface-shape model of the novel CPC and its mathematical solution are constructed theoretically. The concentration performance of the proposed CPC is analyzed and compared with that of a traditional CPC. The results show that the ordinate value of the surface-shape starting point decreases when the diameter of the circular absorber increases at the same contingence angle of the proposed CPC with a circular absorber. The ordinate value of the surface-shape starting point is -29 mm when the diameter of the circular absorber is 47 mm and the contingence angle is 5.56°. Moreover, the geometric concentration ratio of this novel CPC decreases with increasing the aperture width angle. In contrast, the permissible receiving angle and the average optical efficiency increase with increasing the aperture width angle. When the aperture width angle is 60°, the geometric concentration ratio, the permissible receiving angle, and the average optical efficiency are 1.16, 74.39°, and 86.77%, respectively. Meanwhile, the energy-flow distribution on the absorber surface of the novel CPC is more uniform than that of the traditional CPC.