In developing countries, open sun drying is a popular, effective, and economical method used for drying and preservation of agricultural, food, and many other products. But the external drying parameters such as heat input, moisture contents, temperature, drying air flow rate etc. cannot be controlled and hence result into larger drying period or undesirable drying rate. The other drawbacks of open sun drying method include degradation of product quality by wind-blown, debris, rain, insects, and animals.