shows the construction of direct solar drying together
with the details of parts and direction of air flow. With the help of experiments on different crop, direct passive dryers are found best for drying small lots of vegetables and fruits as carrots, French beans, potato, banana, mango and pineapple [103]. In this type of dryer, perforated trays are used to place crop sample to dry, which allow air to pass on the crop surface as shown Fig. 8 [104]. In direct solar drying case, crop is placed inside a glazed roof box which has