3.1. Solar irradiation and temperature
Drying experiments were performed in May 2010. Average temperatures recorded during drying experiments in the collector part of the solar dryer, at the inlet and exit of the spouting bed and in the surrounding were given in Table 1. As it can be seen from the table, ambient temperature changed between 20 and 27.4oC while temperature of the collector part of the solar dryer changed between 40 and 68o C during the experiments.