Direct solar dryers have a drying chamber which is an insulated box covered by a transparent cover made of glass or plastic and having air holes to allow air to enter and exit the chamber [24,25]. When the solar radiation impinges on the glass cover, the air heat up and circulates either naturally or by wind pressure using external source (e.g., fan, blower, etc.) or combination of both. A part of impinged solar radiation will get reflected back to the atmosphere whereas the other part will get transmitted inside the dryer cabinet. This transmitted part is again reflected back from the product surface and rest is absorbed by it which increases the product temperature and reduces its moisture content by evaporation [8].