A Design Method for Thermosyphon Solar Domestic Hot Water Systems

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 y...

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Bibliographic Details
Published in:Journal of solar energy engineering 1987-05, Vol.109 (2), p.150-155
Main Authors: Malkin, M. P, Klein, S. A, Duffie, J. A, Copsey, A. B
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Exact sciences and technology
Natural energy
Solar energy
Solar thermal conversion
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Summary: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.
ISSN:0199-6231
1528-8986
DOI:10.1115/1.3268192