Photothermal Properties of Compound Parabolic Concentrator Under Low Interception Ratio

Dezhong Wu; Ming Li; Guoliang Li; Yunfeng Wang; Zhikang Feng; Guofu Zhou

doi:10.3788/LOP56.082201

Laser & Optoelectronics Progress, Volume. 56, Issue 8, 082201(2019)

Photothermal Properties of Compound Parabolic Concentrator Under Low Interception Ratio

Dezhong Wu^1,2, Ming Li^1、*, Guoliang Li¹, Yunfeng Wang¹, Zhikang Feng¹, and Guofu Zhou³

Author Affiliations

¹ Solar Energy Research Institute, Yunnan Normal University, Kunming, Yunnan 650500, China

² School of Physics and Electronic Information, Yunnan Normal University, Kunming, Yunnan 650500, China

³ South China Advanced Optoelectronics Research Institute, South China Normal University, Guangzhou, Guangdong 510631, China

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Abstract Get PDF(in Chinese)

Figures & Tables(12)

Fig. 1. Schematic of CPC cross section

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Fig. 2. Concentration ratio and CPC arc length versus interception ratio

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Fig. 3. Number pairs of CPC under two interception ratios and same area

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Fig. 4. Total number and arc length ratios of CPC versus interception ratio

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Fig. 5. Schematic of ray tracing. (a) One dimensional; (b) two dimensional

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Fig. 6. Influence of interception ratio on direct optical efficiency of CPC. (a) January 1st; (b) April 1st; (c) July 1st; (d) October 1st

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Fig. 7. Effect of CPC length on end ray loss

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Fig. 8. Heat transfer model of collector tube. (a) All glass vacuum tube with internal structure of U type aluminum tube; (b) thermal resistance grid

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Fig. 9. Schematic of SCPC heat collector system

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Fig. 10. Data processing. (a) Diagram of meteorological data; (b) comparison diagram of experimental and simulated values

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Table 1. Related parameters of CPC
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Table 1. Related parameters of CPC
Outerglass tuberadiusR /mm Innerglass tuberadiusr /mm Parabolicreflectivity/% Vacuumtubetransmittance/% Receivertubeabsorptivity/%
35 29 82 84 91

Table 2. Test data of CPC heat collector under low interception ratio

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Table 2. Test data of CPC heat collector under low interception ratio

T_a/℃	T_in/℃	T_out/℃	I_U/(W·m^-2)	T^*/(m²·℃·W^-1)	η/%
17.9	20.2	29.4	877.51	0.0026	59.41
17.1	29.5	38.2	852.83	0.0145	57.81
17.2	40.3	49.1	916.19	0.0252	54.43
17.9	50.2	58.9	935.32	0.0345	52.71
18.2	60.1	68.1	931.86	0.0450	50.47
Annotation: T_a is the ambient temperature and T^* is the normalized temperature difference, T^*=(T_in-T_a)/I_U.

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Dezhong Wu, Ming Li, Guoliang Li, Yunfeng Wang, Zhikang Feng, Guofu Zhou. Photothermal Properties of Compound Parabolic Concentrator Under Low Interception Ratio[J]. Laser & Optoelectronics Progress, 2019, 56(8): 082201

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