The drying process involves feeding the mass transfer and heat transfer . Mass flow during dry foods are mostly water contained in food . During the drying period So many different diet changes . Both desired and unwanted . Drying foods with high performance. Regardless of the quality of the food has been like after drying the night . (Rehydration) by sucking water back in. Nutritional value, taste, flavor, color , texture, shape , and they must take into account the energy savings. The introduction of Renewable Energy to make the most of it.