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Appl. Sci. 2018, 8(3), 391;

Exergy Analysis of Serpentine Thermosyphon Solar Water Heater

Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6–1 Kasuga-koen, Kasuga, Fukuoka 816–8580, Japan
Green Asia Education Center, Kyushu University, 6–1 Kasuga-koen, Kasuga, Fukuoka 816–8580, Japan
Institute of Energy, University of Dhaka, Dhaka 1000, Bangladesh
International Institute for Carbon-Neutral Energy Research, Kyushu University, Motooka, Nishi Ward, Fukuoka 819–0385, Japan
Authors to whom correspondence should be addressed.
Received: 31 January 2018 / Revised: 22 February 2018 / Accepted: 1 March 2018 / Published: 7 March 2018
(This article belongs to the Special Issue Sciences in Heat Pump and Refrigeration)
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The performance of a solar hot water system is assessed for heat pump and domestic heating applications. Thermodynamic analysis on a serpentine-type thermosyphon flat-plate solar heater is conducted using the Second Law of thermodynamics. Exergetic optimization is first performed to determine the parameters for the maximum exergy efficiency using MATLAB optimization toolbox. Geometric parameters (collector surface area, dimensions, and pipe diameter), optical parameters (transmittance absorptance product), ambient temperature, solar irradiation and operating parameters (mass flow rate, fluid temperature, and overall heat transfer (loss) coefficient) are accounted for in the optimization scheme. The exergy efficiency at optimum condition is found to be 3.72%. The results are validated using experimental data and found to be in good agreement. The analysis is further extended to the influence of various operating parameters on the exergetic efficiency. It is observed that optical and thermal exergy losses contribute almost 20%, whereas approximately 77% exergy destruction is contributed by the thermal energy conversion. Exergy destruction due to pressure drop is found negligible. The result of this analysis can be used for designing and optimization of domestic heat pump system and hot water application. View Full-Text
Keywords: exergy; optimization; serpentine; thermosyphon; solar water heater; exergy destruction exergy; optimization; serpentine; thermosyphon; solar water heater; exergy destruction

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Hasan, M.F.; Mahadi, M.S.U.R.; Miyazaki, T.; Koyama, S.; Thu, K. Exergy Analysis of Serpentine Thermosyphon Solar Water Heater. Appl. Sci. 2018, 8, 391.

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