Abstract
Food dehydration is one of the oldest unit operations used by the food processing industry. Food dehydration is a process of reducing moisture of food to low levels for improved shelf life by adding one or more forms of energy to the food. However, it does not include removal of moisture from food by mechanical pressing or concentration of liquid foods. Most commonly, heat is added to the food by hot air, which also carries the moisture away from the food. The process of food dehydration involves simultaneous transfer of mass and heat within the food and the medium used to transfer energy to the food. In food dehydration methods that supply energy to the food using media other than hot air, air or some other gas may be required to move moisture away from the food.
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