Characteristic Heat Removal Efficiency for Thermosyphon Solar Water Heaters During the System Application Phase

[+] Author and Article Information
J. M. Chang

Department of Mechanical Engineering, Far East College, No. 49, Chung-Hwa Road, Hsin-Shih Town, Tainan County, 744, Taiwan

J. Sol. Energy Eng 126(3), 950-956 (Jul 19, 2004) (7 pages) doi:10.1115/1.1753576 History: Received July 01, 2003; Revised February 01, 2004; Online July 19, 2004
Copyright © 2004 by ASME
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Experimental testing system configuration employed to evaluate the heat removal efficiency of various thermosyphon systems
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Heat removal patterns of System A for: (a)–(c) presenting the case of different discharge flow rates V̇d at constant Ti−T̄w=14.5°C,20.6°C,26.3°C, respectively and (d) different temperature differences Ti−T̄w at constant discharge flow rate V̇d=10 L/min. (Note that normalized time=testing time/time tf. The term “drop-off point” refers to the value of the data point on the Te−Tw curve at which it quickly drops at least 3% in comparison with the value of its relative data on the Ti−T̄w curve).
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Relationship between heat removal efficiency, (Ti−T̄w) and V̇d for Systems A and B
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Empirical models of heat removal efficiency for: (a) System A with data correlation coefficient Rxy=0.901, (b) System B with data correlation coefficient Rxy=0.889, (c) System C with data correlation coefficient Rxy=0.967 and (d) System D with data correlation coefficient Rxy=0.904
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Relationship between heat removal efficiency and integrated parameter (Ti−T̄w)/V̇d derived from analysis of the experimental data for Systems A, B, C and D. (Note that the characteristic heat removal efficiency, ηR*, is defined as the value of ηR at (Ti−T̄w)/V̇d=2.0)
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Design performance curve for system’s storage tank geometry dimensions to optimize the characteristic heat removal efficiency of a system. (Note that the data correlation coefficient Rxy=0.856)




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