2.4. Drying
Pea grains were shelled before drying. The flow rate of the air was adjusted to the minimum spouting air velocity which was 0.60 m/s. Air blower was operated half an hour before the experiment to adjust steady temperature in spouting column. When the steady conditions were provided, 250 g of sample was loaded into the spouting column. Weight of the sample was measured every 30 min during drying. Temperature of air in the solar collector, at the inlet and exit of the spouting column and in the surrounding were determined by thermocouples. During drying solar irradiation was also measured using pyranometer (Kipp & Zonen, CM11, Delft, Holland) in units of W/m2.