Define the Basic Types of Drying Process?

Primarily, there are three basic types of drying process:

a) Sun drying and solar drying; 

b) Atmospheric drying including batch (kiln, tower and cabinet dryers) and continuous (tunnel, belt, belt-trough, fluidised bed, explosion puff, foam-mat, spray, drum and microwave); 

c) Sub-atmospheric dehydration (vacuum shelf/belt/drum and freeze dryers). 

 The scope is expanded to include low temperature, low energy process like osmotic dehydration.