Experimental study and exergetic analysis of a CPC-type solar water heater system using higher-temperature circulation in winter |
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| Authors: | Pei Gang Li Guiqiang Zhou Xi Ji Jie Su Yuehong |
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| Affiliation: | 1. Department of Thermal Science and Energy Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei City 230026, China;2. Institute of Sustainable Energy Technology, The University of Nottingham, University Park, Nottingham NG7 2RD, UK;1. Department of Thermal Science and Energy Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei City 230026, China;2. Institute of Sustainable Energy Technology, University of Nottingham, University Park, Nottingham NG7 2RD, UK;1. Department of Thermal Science and Energy Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei City 230026, China;2. Institute of Sustainable Energy Technology, University of Nottingham, University Park, Nottingham NG7 2RD, UK;1. Centre for Energy Studies, Indian Institute of Technology Delhi, HausKhas, New Delhi, 110016, India;2. Bag Energy Research Society (BERS), SODHA BERS COMPLEX, Plot No. 51, Mahamana Nagar, Karaudi, Varanasi, UP 22 10 05, India |
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| Abstract: | The common solar water heater system can meet low temperature requirements, but exhibits very low efficiency in attaining higher water temperatures (55–95 °C). In the current paper, a compound parabolic concentrator (CPC)-type solar water heater system experiment rig with a U-pipe was set up, and its performance in meeting higher temperature requirements was investigated. The experiments were conducted in December at Hefei (31°53′ N, 117°15′ E), in the eastern region of China. The system showed steady performance in winter, with overall thermal efficiency always above 43%. The water in the tank was heated from 26.9 °C to 55, 65, 75, 85, and 95 °C. Through the experimental study and exergetic analysis of the solar water heater system, results of the five experiments showed thermal efficiency of above 49.0% (attaining 95 °C water temperature) and exergetic efficiency of above 4.62% (attaining 55 °C water temperature). Based on these results, the CPC-type solar water heater system with a U-pipe shows superior thermal performance in attaining higher temperatures and has potential applications in space heating, heat-powered cooling, seawater desalination, industrial heating, and so on. |
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