Effect of Various Artificial Roughnesses on Solar Air Heater Performance

Many researchers have been conducting various experiments to improve heat transfer rate for solar air heater. Heat transfer rate can be increased by providing various artificial roughnesses to collector plate. By providing the various types of roughness like dimple, v shaped rib roughness on absorber plate inclined as well as the transverse rib on absorber plate. By using heat transfer coefficient the roughness number is fiend out and to decide that the actual now many heat transfer rate is increase. In this paper a review of different heat transfer enhancement techniques have been summarized.