Photothermal properties of point focused transmissive fresnel collector

doi:10.16085/j.issn.1000-6613.2020-0100

Abstract

Abstract:

Aimed at the problem of low thermal uniformity caused by non-uniform radiation, point focused transmissive Fresnel concentrator is designed and concentrating performance model is established based on Tracepro optical software and Monte Carlo ray tracing method, to study the influence of different design parameters of concentrator on optical performance. Through simulation, the following results show that: 1) F number, pitch and tracking error have great influence on optical efficiency and geometric concentrating ratio. The uniformity of light spot energy varies with the relative position in V shape; 2) The concentrator is not necessarily the best at the focal length. Properly reducing the spacing not only improves thermal uniformity but also saves space and cost; 3)The optical efficiency of the point-focus transmissive Fresnel collector designed in this paper is 82.69%, uniformity of light spot energy is 22.06%, the geometric concentration ratio is 226, the average heat flux density is 64924W/m², and the comprehensive performance of optical performance and thermal uniformity is good. It has certain applicability and application prospects in the field of concentrated photovoltaic and solar thermal utilization.

Key words: solar energy, Fresnel condenser, optical properties, optical efficiency, thermodynamics, model

摘要：

针对非均匀辐射造成的热均匀性不高的问题，本文基于Tracepro光学软件，采用Monte Carlo光线追迹法，设计点聚焦透射式菲涅尔聚光器，并建立聚光性能模型，研究F数、相对位置和跟踪误差3种不同设计参数对光学性能的影响规律。通过仿真模拟得到：①F数、跟踪误差对光学效率和几何聚光比影响较大，对热均匀性影响较小；②光斑能量均匀度随相对位置呈V形规律变化，聚光器在焦距位置并不一定是最好的，适当缩小间距不仅可以提高热均匀性还可以节省空间和造价；③本文设计的点聚焦透射式菲涅尔集热器光学效率82.69%，光斑能量均匀度22.06%，几何聚光比226，平均热流密度64924W/m²，聚光性能和热均匀性综合性能良好，在聚光光伏和光热利用领域有一定的适用性和应用前景。

关键词: 太阳能, 菲涅尔聚光器, 光学性能, 光学效率, 热力学, 模型

CLC Number:

TK511

Jiarui WU, Zhiwei TANG, Yanzhao ZHOU, Hao WANG. Photothermal properties of point focused transmissive fresnel collector[J]. Chemical Industry and Engineering Progress, 2020, 39(S1): 55-63.

吴佳睿, 唐志伟, 周燕昭, 王昊. 点聚焦透射式菲涅尔聚光器的光热性能[J]. 化工进展, 2020, 39(S1): 55-63.

Figures/Tables 2

References 18

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