FIELD: drying of lumber, food products in cylindrical closed-contour reservoirs. SUBSTANCE: heating is performed simultaneously with changing pressure until value safe for material. Then successive continuous-change cycles providing temperature reduction followed with pressure lowering and vice versa are performed. Process is realized in cylindrical housing with outer jacket. Heat dissipators, drop collector, bars for drying air are mounted inside housing. EFFECT: enhanced quality of dried material, intensified drying process, lowered energy consumption. 3 cl, 2 dwg
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