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Received: 27 September 2017 Accepted: 20 August 2018 The thermal performance of a solar air heater is presented with addition fins. In this work, we developed an experimental study on the thermal performance of a solar collector air with and without semi-cylindrical baffle. In trying to change the mass flow rates times for both configurations corresponding to tilt angle  = 37 °, it represented the optimum tilt angle of the city of Biskra. The essential parameters are measurements of the outlet, an inlet and an ambient temperature and covering according to the influence of the wind velocity. Experiments on a solar collector designed for this purpose, have determined the thermal efficiency of solar collector with and without semi-cylindrical baffle to different flow intervals to actually follow the evolution of the outlet temperature of the air. The results provide the best thermal efficiency for a solar collector flat plate with semi-cylindrical baffle is increased by 19% that of without baffle.

Experimental study of thermal efficiency of a solar air heater with an irregularity element on absorber plate