A Design Method for Thermosyphon Solar Domestic Hot Water Systems

[+] Author and Article Information
M. P. Malkin, S. A. Klein, J. A. Duffie, A. B. Copsey

Solar Energy Laboratory, University of Wisconsin-Madison, Madison, WI 53706

J. Sol. Energy Eng 109(2), 150-155 (May 01, 1987) (6 pages) doi:10.1115/1.3268192 History: Received March 01, 1986; Online November 11, 2009


A modification to the f -Chart method has been developed to predict monthly and annual performance of thermosyphon solar domestic hot water systems. Stratification in the storage tank is accounted for through use of a modified collector loss coefficient. The varying flow rate throughout the day and year in a thermosyphon system is accounted for through use of a fixed monthly “equivalent average” flow rate. The “equivalent average” flow rate is that which balances the thermosyphon buoyancy driving force with the frictional losses in the flow circuit on a monthly average basis. Comparison between the annual solar fraction predited by the modified design method and TRNSYS simulations for a wide range of thermosyphon systems shows an RMS error of 2.6 percent.

Copyright © 1987 by ASME
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