Highly Concentrated Solar Flux of Large Fresnel Lens Using CCD Camera-Based Method

Kexin Zhang, Ying Su, Haiyu Wang, Qian Wang, Kai Wang, Yisen Niu and Jifeng Song ()
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Kexin Zhang: School of New Energy, North China Electric Power University, Beijing 102206, China
Ying Su: Institute of Science and Technology, China Three Gorges Corporation, Beijing 100038, China
Haiyu Wang: School of New Energy, North China Electric Power University, Beijing 102206, China
Qian Wang: Institute of Science and Technology, China Three Gorges Corporation, Beijing 100038, China
Kai Wang: School of New Energy, North China Electric Power University, Beijing 102206, China
Yisen Niu: School of New Energy, North China Electric Power University, Beijing 102206, China
Jifeng Song: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China

Sustainability, 2022, vol. 14, issue 17, 1-16

Abstract: Fresnel lens is a kind of lens that can concentrate sunlight up to a level of thousands of suns with small space occupation which is widely used in the research of sunlight concentration and transmission systems via optical fiber. Most studies on the concentrated flux of lenses use experimental methods to measure the flux distribution on the receiver of parabolic trough solar concentrators, solar power towers, and parabolic dish concentrators, while for Fresnel lenses, especially large-aperture Fresnel lenses such as the one in this manuscript, the simulation approach was mostly used. In response to this problem, this study has developed an experimental system for measuring the concentrated flux density of Fresnel lenses. A charge-coupled device (CCD) camera was used to capture the image of spot of large-aperture (968 mm) Fresnel lenses in the CCD camera-based method, and a heat flow meter was used to calibrate the spot brightness image obtained by the CCD camera. Experimental data show that the peak flux of concentrated spot can reach 4.06 MW/m 2 . This method confirms the simulation results of previous studies that using the rays tracing method, that is, the flux level of the Fresnel lenses can reach 5000 suns. The experimental results demonstrated the CCD camera-based method combined with a heat flow meter is competent in measuring the intensity of flux with a level of 5000 suns.

Keywords: Fresnel lens; flux density distribution; measurement; CCD images (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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