Modeling occupant behavior’s influence on the energy efficiency of solar domestic hot water systems

2022 ◽  
Vol 309 ◽  
pp. 118503
Xin Zhou ◽  
Shuai Tian ◽  
Jingjing An ◽  
Da Yan ◽  
Lun Zhang ◽  
1987 ◽  
Vol 109 (2) ◽  
pp. 150-155 ◽  
M. P. Malkin ◽  
S. A. Klein ◽  
J. A. Duffie ◽  
A. B. Copsey

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.

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