RESEARCH ON OPTICAL PERFORMANCE OF COMPOSITE PARABOLIC CONCENTRATOR COLLECTOR BASED ON RECEIVER CLOSURE

Liu Yi; Zhang Weiwei; Gao Hong; Han Xinchen; Zhang Zijing

doi:10.19912/j.0254-0096.tynxb.2024-0050

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (5) : 410-418. DOI: 10.19912/j.0254-0096.tynxb.2024-0050

RESEARCH ON OPTICAL PERFORMANCE OF COMPOSITE PARABOLIC CONCENTRATOR COLLECTOR BASED ON RECEIVER CLOSURE

Liu Yi, Zhang Weiwei, Gao Hong, Han Xinchen, Zhang Zijing

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Abstract

To improve the solar energy utilization efficiency of compound parabolic concentrators（CPC）, optical models were established for three CPC structures： non-evacuated, glass-covered, and evacuated-tubular based on the principles of ray tracing. The optical performance of CPC under these three structures was systematically investigated. The results reveal that, after a glass sleeve was added outside the receiver, some rays with angles exceeding the critical refraction angle could not be intercepted by the receiver due to refraction by the glass sleeve, resulting in additional optical losses. As the outer diameter of the glass sleeve increases, the number of rays interceptable by the receiver gradually decreases, leading to a progressive decline in the optical efficiency of the CPC. The incident angle of ray affects the circumferential heat flux distribution of the receiver. As the incident angle of ray is 20°, the influence of the critical refraction angle on the optical performance of the CPC is minimized, with the optical efficiencies of the glass-covered and evacuated-tubular CPCs being 68.5% and 65.5%, respectively.

Key words

solar energy / ray tracing / heat flux / compound parabolic collector / optical efficiency

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Liu Yi, Zhang Weiwei, Gao Hong, Han Xinchen, Zhang Zijing. RESEARCH ON OPTICAL PERFORMANCE OF COMPOSITE PARABOLIC CONCENTRATOR COLLECTOR BASED ON RECEIVER CLOSURE[J]. Acta Energiae Solaris Sinica. 2025, 46(5): 410-418 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0050

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