Influence of optical error on optical performance of flux homogenizing dish concentrator system with concave lens window

被引：0
|
作者：
Yan J. [1 ]
Tian Y. [1 ]
Nie D. [1 ]
Liu Y. [1 ]
Peng Y. [1 ]
机构：
[1] College of Mechanical Engineering, Hunan University of Science and Technology, Xiangtan
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2021年 / 42卷 / 11期
关键词：
Concave lens; Concentrator; Dish concentrator; Flux distribution; Optical errors; Optical performance; Solar energy;
D O I：
10.19912/j.0254-0096.tynxb.2020-1350
中图分类号：
学科分类号：
摘要：
The optical errors will be introduced in the manufacture and operation of solar dish concentrator/cavity receiver system (SDC), which will deteriorate its optical performance and flux distribution. In this paper, aiming at the SDC system with concave lens quartz window (i.e., planar-conical lens and biconcave conical lens) which has obtained the uniform flux distribution under the ideal optical conditions, the effects of surface optical characteristic variation (absorptivity and reflection characteristic), mirror slope error and tracking error on the flux distribution and optical performance of SDC system are studied in detail. The optical characteristics of SDC system are analyzed and engineering application feasibility of using concave lens to improve the flux uniformity is evaluated. The results show that under the same optical error, the direct useful energy rate of SDC system using the planar-conical lens is 2.5%-4.0% higher than that of the biconcave lens, and their optical efficiency is basically equal. The optical reflection characteristics of the absorber surface have a significant impact on its optical performance. Diffuse reflection on the surface absorber is better than specular reflection, especially when the surface absorptane decreases. The absorber surface should be designed as an optical diffuse reflection surface with high absorptane. Within the controllable range of optical error, the optical performance of SDC system with optimized concave lens is insensitive to mirror slope error and tracking error, and has good engineering adaptability. Using concave lens to improve the flux uniformity of traditional SDC system and reduce radiation heat loss and convection heat loss in practical engineering is an economical and operable effective way, which fully exploits the application value of the quartz window in the field of concentrated solar energy utilization. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.
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页码：201 / 208
页数：7
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