Shariah, A.M.; Ecevit, A.
May 1995
Energy Conversion and Management, vol 36-5, p. 289-296
A thermosyphon solar water heating system with an in-tank auxiliary electric heater has been simulated for different hot water load temperatures using the TRNSYS simulation program. The results of the simulation show that the annual efficiency and solar fraction are functions of the hot water load temperatures. The effect of load temperature on the solar fraction is found to be very large when the daily load volume (the volume of hot water delivered to load) to collector area ratio is large. The influence of storage tank volume to collector area ratio on the efficiency of the collector is observed only when this ratio is less than or equal to 40 l m2 for all collector areas and load temperatures studied. Generally, the annual average storage tank temperature depends on the load temperature and had lower values for high load temperatures. The response of the system performance to the area of the collector is found to be very large when the system operates with a solar fraction below 70%.
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