Human comfort is the main goal of the different air conditioning systems. In modern systems, the radiant panels are used in rooms, because they produce a low noise levels and the required equipment are few. In this work, two types of radiant panels were used; an electric heating panel was used in a scale room model for heating process, while radiant cooling panels with cooling coils were used in a typical full scale room for cooling process. The two processes were studied experimentally and numerically. A numerical model was also employed to study flow pattern inside the rooms and to predict...