ANALYSIS ON INFLUENCE CHARACTERISTICS OF KEY PARAMETERS OF SMALL-SCALE FIXED-FOCUS LINEAR FRESNEL LENS CONCENTRATOR

Li Haoteng; Huang Jin; Wang Hai; Yan Jian

doi:10.19912/j.0254-0096.tynxb.2020-1163

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (5) : 230-237. DOI: 10.19912/j.0254-0096.tynxb.2020-1163

ANALYSIS ON INFLUENCE CHARACTERISTICS OF KEY PARAMETERS OF SMALL-SCALE FIXED-FOCUS LINEAR FRESNEL LENS CONCENTRATOR

Li Haoteng¹, Huang Jin¹, Wang Hai^2,3, Yan Jian⁴

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Abstract

A small-scale Fresnel fixed-focus linear concentrating system using arc-cavity absorber is proposed based on the concentrating characteristics of linear Fresnel lens and the principle of polar tracking. The influence of key parameters such as solar declination angle, solar time angle and internal surface absorptivity of absorber on the optical properties of the concentrating system is studied in detail by using Monte Carlo ray tracing method and the principle of mathematical statistics. The results indicate that the internal surface absorptivity of absorber has the most significant effect on the optical efficiency factor. When the absorptivity is 1.00, 0.85 and 0.75 respectively, the average optical efficiency factor of the system is 0.950, 0.865 and 0.799 respectively. When the sun declination angle is 0°, 8°, 16° and 23.45°, the average uniformity factors are 0.507, 0.519, 0.561 and 0.612, respectively. The system is highly effective on the reduction of the cosine loss as well as the impact of focal line offset on the end loss.

Key words

Fresnel / solar collectors / optical properties / cavity absorber / fixed-focus / slip regulation

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Li Haoteng, Huang Jin, Wang Hai, Yan Jian. ANALYSIS ON INFLUENCE CHARACTERISTICS OF KEY PARAMETERS OF SMALL-SCALE FIXED-FOCUS LINEAR FRESNEL LENS CONCENTRATOR[J]. Acta Energiae Solaris Sinica. 2022, 43(5): 230-237 https://doi.org/10.19912/j.0254-0096.tynxb.2020-1163

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