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Drying of biological materials in the dryer with controlled vacuum chambers

Drying is a well-known technological process by which agricultural products are treated so as to be stored for longer times. Under the concept of drying are understood physical phenomena that, with the effect of heat, reduce the moisture content in the materials without a change in their chemical composition. Moisture is removed by condensation, evaporation or sublimation. The removal of moisture by methods other than by heat (e.g. mechanical or chemical) are not considered as drying. Agricultural materials in most cases represent biologically living organisms in their structure and composition of colloidal capillary-porous material. They contain a large number of microscopic pores, a microcapillary and a macrocapillary, in which water is able to pass from the inner to the grain surface or vice versa.