The scientific research illustrates that the change in humidity over the entire surface of the material placed oneach shelf of the drying chamber has analyzed. The drying rate substantiated depending on the trajectory of the coolantflow and the geometric arrangement of the mesh shelves. A drying device has developed that ensures uniform removalof moisture from the surface of the product due to the arrangement of mesh hearths relative to each other, as well as dueto the formation of spherical holes on both sides of the shelves. The optimal configuration of the outlet nozzles has proposed,which ensures the continuous removal of moist air released from the product composition per unit of time. Basedon the studies carried out, the diffusion coefficient for the air-water vapor system was determined. The calculations havecarried out on a stationary field of the coolant velocity in the working zone of the dryer and non-stationary conditions ofheat and moisture transfer.