Experimental Investigation of Thermal Efficiency of Solar Air Collector with Trapeze Absorber Plate

In this study, thermal efficiency of solar air collectors with trapezoidal and flat plate absorber is experimentally investigated. in the experiments, outside air temperature, global radiation, temperatures of the two different points on the absorber plate, air velocity and temperature at the collector outlet are measured. the thermal efficiency is calculated based on the measurements. average thermal efficiency of solar air collector with trapezoidal absorber plate is 28.5 % while avarage thermal efficiency of solar air collector with flat absorber plate is 23.1 %. as a result, thermal efficiency of solar air collector with trapezoidal absorber plate is higher than that of solar air collector with flat absorber plate.