FIELD: food industry. SUBSTANCE: system has three loops. The first loop controls operation of a recuperative heat exchanger and sets it in operation when a given difference between temperatures of exhaust and fresh air is reached. The second loop cuts off the heat exchanger when passages for exhaust air clog up mechanically. The third loop prevents against freezing of inner surfaces of heat exchanging passages of the recuperative heat exchanger that are arranged at inlet branch pipe for supplying fresh air. EFFECT: enhanced efficiency. 1 dwg
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