期刊名称：International Journal of Energy and Environment
印刷版ISSN：2076-2895
电子版ISSN：2076-2909
出版年度：2012
卷号：3
期号：6
页码：881-894
出版社：International Energy and Environment Foundation (IEEF)
摘要：As thermal efficiency of conventional solar air heater is low, best way is to enhance its thermal efficiency is make the flow turbulent. This can be achieved by using the artificial roughness on underside of absorber plate. An attempt has been made to enhance its thermal as well as thermohydraulic performance by providing roughness elements. An experimental investigation has been carried out on M-shaped ribs having circular cross section on absorber plate. The duct is having an aspect ratio of (W/H) 11.41, relative roughness height (e/D) 0.033-0.077, relative roughness pitch (P/e) 12.5-75 and angle of attack (α) 30-60°. The range for Reynolds number has been considered to be 3000-22000. The best result of thermal and thermohydraulic performance has been observed at (e/D) 0.077, (P/e) 25 and (α) 60°.
