Optical Performance Comparison of Different Shapes of Cavity Receiver in the Fixed Line-Focus Solar Concentrating System

Hai Wang, Mengjie Song and Haoteng Li
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Hai Wang: Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Mengjie Song: Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Haoteng Li: Department of Energy Engineering, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China

Sustainability, 2022, vol. 14, issue 3, 1-25

Abstract: To optimize the fixed-focus solar concentrating system (FLSCS) and linear cavity receiver of better optical performance, the effects of receiver parameters (geometric shape, receiver position f , receiver internal surface absorptivity α ab , and end reflection plane reflectivity ρ r ) on the relative optical efficiency loss η re-opt , loss , the maximum value of the local concentration ratio X max , and the non-uniformity factor σ non were studied in the present study. The results showed that the increases of sun declination angle δ in the range of 0–8° have a weak effect on the η re-opt , loss . The η re-opt , loss are 2.25%, 2.72%, 12.69% and 2.62%, 3.26%, 12.85%, respectively, when the solar hour angle ω is 0°, 30°, 60° as δ = 0° and 8° for linear rectangular cavity receiver. The X max mainly depends on the energy flux distribution of first intercepted sunlight on the cavity absorber inner wall. Increasing the distance between the cavity absorber inner wall and the focal line Δ f can affect the X max . The smaller the Δ f , the greater the X max , and vice versa. The changing trend of σ non is basically consistent with that of the X max . When the f is 600, 625, 650, 675, 700 mm and the ω = 0°, the σ non are 0.832, 0.828, 0.801, 0.747, and 0.671, respectively, for linear rectangular cavity receiver. This work could establish the foundation for further research on the optical to thermal energy conversion in the FLSCS.

Keywords: solar collector; cavity receiver; optical performance comparison; energy flux distribution (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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