Experimental Investigation on Heat Transfer Coefficient and Thermal Efficiency of Solar Air Heaters Having Different Baffles Charaf-Eddine Bensaci, Abdelhafid Moummi and Adnane Labed Abstract The courant research presents the heat transfer and thermal efficiency in an experimental investigation of solar air collector system for several configurations in Biskra Region (Algeria). Experiments were performed for forced convection airflow in the air duct of SAH to define the performance. A conventional solar air heater considered for the comparison purpose was working under similar conditions for all the configurations. The effect of baffles configurations and arrangement on the convective heat transfer coefficient and thermal efficiency were compared. The results showed that the thermal performance is proportional to the solar intensity at the Type I and a specific mass flow rate. Keywords Heat transfer · Thermal efficiency · Baffles · Mass flow rates Nomenclature A Absorber plate surface area, m 2  Heat flux, W m −2 h Convective heat transfer coefficient, W m −2 K −1 h (x ) Local convective heat transfer coefficient, W m −2 K −1 Q u Useful heat gain, W m −2 T ab Absorber temperature, K C.-E. Bensaci (B ) · A. Moummi · A. Labed Laboratoire de Génie Mécanique (LGM), Université Mohamed Khider Biskra, BP 145, 07000 Biskra, Algeria e-mail: faf_3@yahoo.fr A. Moummi e-mail: moummi.abdelhafid@gmail.com A. Labed e-mail: adnanelabed@yahoo.fr C.-E. Bensaci · A. Moummi Laboratoire de Génie Civil, Hydraulique, Developpement Durable et Environnement (LAR-GHYDE), Université Mohamed Khider, BP 145, 07000 Biskra, Algeria © Springer Nature Switzerland AG 2020 I. Dincer et al. (eds.), Environmentally-Benign Energy Solutions, Green Energy and Technology, https://doi.org/10.1007/978-3-030-20637-6_17 309