Experimental Investigation on the Vector Characteristics of Concentrated Solar Radiation Flux Map

Guilong Dai, Ying Zhuang, Xiaoyu Wang, Xue Chen (), Chuang Sun and Shenghua Du ()
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Guilong Dai: School of Energy Science and Engineering, Harbin Institution of Technology, Harbin 150001, China
Ying Zhuang: Key Laboratory of New Energy and Energy Conservation for Buildings in Fujian Province, Fujian University of Technology, Fuzhou 350118, China
Xiaoyu Wang: Key Laboratory of New Energy and Energy Conservation for Buildings in Fujian Province, Fujian University of Technology, Fuzhou 350118, China
Xue Chen: School of Energy Science and Engineering, Harbin Institution of Technology, Harbin 150001, China
Chuang Sun: School of Energy Science and Engineering, Harbin Institution of Technology, Harbin 150001, China
Shenghua Du: School of Energy Science and Engineering, Harbin Institution of Technology, Harbin 150001, China

Energies, 2022, vol. 16, issue 1, 1-15

Abstract: It is difficult to measure the concentrated solar radiation flux (CSRF) inside a cavity receiver directly due to the complex geometry of cavity receivers. At present, most reports measure the CSRF at the aperture plane (generally coinciding with the focal plane of solar concentrators) of the cavity receiver instead of at the absorber wall, which would result in serious aberration because of the obvious difference in configuration between the aperture plane and the absorber wall. To obtain the CSRF at the absorber wall with complex geometry, the vector characteristics (consisting of both directional distributions and spatial distributions) of the CSRF at the focal plane were measured using developed double water-cooled Lambertian targets together with a CCD (charge-coupled device) camera. Then the CSRF images at the absorber wall of a hemisphere cavity receiver were carried out by applying MCRTM (Monte Carlo ray-tracing method) in combination with the measured vector results of the CSRF at the aperture plane. Results show that the directional distributions of the CSRF at the aperture plane are rather nonhomogeneous along the zenith angle and the circumferential angle. The directional distribution performance of the CSRF at the focal plane plays an equally important role in the CSRF images of the cavity receivers. In addition, the relative error of the peak CSRF value of the cavity receiver between the uniform and the measured directional distribution cases is up to 16%. The conclusions provide an important reference for the development of the CSRF measurement.

Keywords: solar energy; concentrated solar radiation flux; directional distributions; geometric optics; cavity receiver (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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