Similarity theory of solar water heater with natural circulation
Journal
Solar Energy
Journal Volume
25
Journal Issue
2
Pages
105-116
Date Issued
1980
Author(s)
URI
Abstract
The similarity theory of solar thermosyphon collector is developed in the present paper. Ten dimension-less groups or system characteristic parameters which uniquely determine the performance of the collector are derived. The solution shows that the mean efficiency generally increases with increasing incident solar radiation and relative height of the tank. For the frictional parameters Ne and Nf higher than 105, the efficiency appears to be independent of the incident radiation and the relative height of the tank. Therefore, for parallel plate absorber, the tank may be designed to sit on the floor without sacrificing the efficiency since the values of Ne and Nf are usually larger than 105 in most designs. © 1980.
SDGs
Type
journal article