Influence of Absorber Shape on Photothermal Performance of Solar Compound Multi-Surface Concentrator

Zehui Chang; Xuedong Liu; Jing Liu; Hongfei Zheng; Xinglong Ma

doi:10.3788/AOS202242.0508001

Acta Optica Sinica, Volume. 42, Issue 5, 0508001(2022)

Influence of Absorber Shape on Photothermal Performance of Solar Compound Multi-Surface Concentrator

Zehui Chang^1,2、*, Xuedong Liu¹, Jing Liu¹, Hongfei Zheng³, and Xinglong Ma³

¹College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 0 10051, China

²Engineering Center of Solar Energy Utilization Technology, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 0 10051, China

³School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

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Figures & Tables(17)

Fig. 1. Schematic diagram of focusing principle of compound multi-surface concentrator

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Fig. 2. Three-dimensional model of compound multi-surface concentrator

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Fig. 3. Three-dimensional models of absorbers. (a) “*”-shaped absorber; (b) rectangular mesh absorber

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Fig. 4. Three-dimensional models of compound multi-surface concentrator embedded with different absorbers. (a) “*”-shaped absorber; (b) rectangular mesh absorber

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Fig. 5. η_o and C_g varying with D

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Fig. 6. η_o and η_c varying with H

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Fig. 7. Ray tracing diagrams of compound multi-surface concentrator under different α. (a)(d) α=0 °; (b)(e) α=6°; (c)(f) α=12°

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Fig. 8. Energy flux density distribution on surfaces of different absorbers when α=0 °. (a)“*”-shaped absorber; (b) rectangular mesh absorber

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Fig. 9. η_o varying with α

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Fig. 10. Concentration efficiency varying with α

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Fig. 11. Test bench for photothermal performance of compound multi-surface concentrator

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Fig. 12. G_sun varying with test time

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Fig. 13. T_out varying with test time

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Fig. 14. Q varying with test time

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Table 1. Geometric modeling parameters of compound multi-surface concentrator

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Table 1. Geometric modeling parameters of compound multi-surface concentrator

Structure		Geometric parameter /(mm×mm×mm)
Reflecting surface		Length×width×height	2000×678×319
Glass cover		Length×width×thickness	2000×678×2
Single-layer glass tube		Length×diameter×thickness	2000×110×2
“*”-shaped receiver		Length×diameter×thickness	2000×108×1.5
	Outer mesh structure	Length×diameter×thickness	2000×106×1
Rectangular mesh receiver	Inner mesh structure	Length×diameter×thickness	2000×98×1
	Rectangular structure	Length×width×thickness	2000×67×1.5

Table 2. Errors of direct testing physical quantities
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Table 2. Errors of direct testing physical quantities
Physical quantity Error /%
Solar irradiance 2
Temperature 0.4
Air flow rate 0.7

Table 3. Parameter comparison of compound multi-surface concentrator with different absorbers

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Table 3. Parameter comparison of compound multi-surface concentrator with different absorbers

Parameter	“*”-shapedabsorber	Rectangularmeshabsorber
Solar irradiance /(W·m^-2)	738	702
Concentrating area /m²	1.3	1.3
Air flow rate /(m·s^-1)	1.81	1.81
Discrepancy between inlet andoutlet air temperature /℃	25.3	19.7
Light-thermal conversionefficiency /%	54.85	44.05

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Zehui Chang, Xuedong Liu, Jing Liu, Hongfei Zheng, Xinglong Ma. Influence of Absorber Shape on Photothermal Performance of Solar Compound Multi-Surface Concentrator[J]. Acta Optica Sinica, 2022, 42(5): 0508001

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