procedure: During the drying experiments, air temperature was recorded at different positions of drying system using seven SMT 160 sensors with accuracy of ± 0.5°C. One of them was installed at the solar collector inlet and three at the drying cabinet and three installed at the air exit from the dryer cabinet. Temperature measurements were performed at the regular intervals of 5 min using a data acquisition system. Solar intensity was measured and recorded at the same time interval by a Casella