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Comparative Experimental Analysis of the Thermal Performance of Evacuated Tube Solar Water Heater Systems With and Without a Mini-Compound Parabolic Concentrating (CPC) Reflector(C < 1)

by 1,2,*, 1,2, 1, 1,* and 2
1
Department of Thermal Science and Energy Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei 230026, China
2
Institute of Sustainable Energy Technology, University of Nottingham, University Park, Nottingham NG7 2RD, UK
*
Authors to whom correspondence should be addressed.
Energies 2012, 5(4), 911-924; https://doi.org/10.3390/en5040911
Received: 17 January 2012 / Revised: 24 February 2012 / Accepted: 22 March 2012 / Published: 10 April 2012
Evacuated tube solar water heater systems are widely used in China due to their high thermal efficiency, simple construction requirements, and low manufacturing costs. CPC evacuated tube solar water heaters with a geometrical concentration ratio C of less than one are rare. A comparison of the experimental rig of evacuated tube solar water heater systems with and without a mini-CPC reflector was set up, with a series of experiments done in Hefei (31°53'N, 117°15'E), China. The first and second laws of thermodynamics were used to analyze and contrast their thermal performance. The water in the tank was heated from 26.9 to 55, 65, 75, 85, and 95 °C. Two types of solar water heater systems were used, and the data gathered for two days were compared. The results show that when attaining low temperature water, the evacuated tube solar water heater system without a mini-CPC reflector has higher thermal and exergy efficiencies than the system with a mini-CPC reflector, including the average and immediate values. On the other hand, when attaining high temperature water, the system with a mini-CPC reflector has higher thermal and exergy efficiencies than the other one. The comparison presents the advantages of evacuated tube solar water heater systems with and without a mini-CPC reflector, which can be offered as a reference when choosing which solar water system to use for actual applications. View Full-Text
Keywords: CPC; water heater; comparative experiment; thermal efficiency; exergetic efficiency CPC; water heater; comparative experiment; thermal efficiency; exergetic efficiency
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MDPI and ACS Style

Pei, G.; Li, G.; Zhou, X.; Ji, J.; Su, Y. Comparative Experimental Analysis of the Thermal Performance of Evacuated Tube Solar Water Heater Systems With and Without a Mini-Compound Parabolic Concentrating (CPC) Reflector(C < 1). Energies 2012, 5, 911-924. https://doi.org/10.3390/en5040911

AMA Style

Pei G, Li G, Zhou X, Ji J, Su Y. Comparative Experimental Analysis of the Thermal Performance of Evacuated Tube Solar Water Heater Systems With and Without a Mini-Compound Parabolic Concentrating (CPC) Reflector(C < 1). Energies. 2012; 5(4):911-924. https://doi.org/10.3390/en5040911

Chicago/Turabian Style

Pei, Gang; Li, Guiqiang; Zhou, Xi; Ji, Jie; Su, Yuehong. 2012. "Comparative Experimental Analysis of the Thermal Performance of Evacuated Tube Solar Water Heater Systems With and Without a Mini-Compound Parabolic Concentrating (CPC) Reflector(C < 1)" Energies 5, no. 4: 911-924. https://doi.org/10.3390/en5040911

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