4.7 Article

Optimized design of a linear Fresnel collector with a compound parabolic secondary reflector

期刊

RENEWABLE ENERGY
卷 171, 期 -, 页码 141-148

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.02.100

关键词

Linear fresnel collector; Compound parabolic concentrator; Geometrical optics efficiency; Mirror field without shading

资金

  1. Fund for Less Developed Regions of the National Natural Science Foundation of China [52066010]
  2. Excellent Team of Scientific Research in Lanzhou Jiaotong University [201703]

向作者/读者索取更多资源

This paper proposes an optimized design method for Linear Fresnel Collectors (LFCs), achieving high efficiency in CPC and mirror field design through studying the effects of CPC half-acceptance angle and truncation ratio on geometric optics efficiency. The results demonstrate that the optimized CPC and mirror field can achieve high efficiency in LFC systems.
In linear Fresnel collectors (LFCs), a receiver composed of CPC secondary reflector and evacuated tube need to be highly coupled with the mirror field. An optimized design method of the LFC is proposed in this paper. Firstly, a mathematical model of the CPC for the LFC is established, with the effects of the choice of half-acceptance angle and truncation ratio on the geometrical optics efficiency of the CPC studied by using the ray tracing method according to the characteristics of the LFC. Secondly, a method for designing the mirror field without shading is presented by using the half-acceptance angle of the CPC to limit its height-width ratio. Finally, a scheme for designing the mirror field is proposed, considering the ground utilization ratio and the mean shading and blocking efficiency. The results indicate that the optimized CPC at half-acceptance angle 50 degrees and truncation ratio 0.4 for the LFC can achieve the geometrical optics efficiency of 84.52%. The designed mirror field can achieve the ground utilization ratio of 73.08% and the mean shading and blocking efficiency of 97.56%. (C) 2021 Elsevier Ltd. All rights reserved.

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