FIELD: ventilation.
SUBSTANCE: invention relates to air ventilation, namely to recuperation of heat in air exchange devices in heated buildings. In a heating system, air removed from a room is directed to a low-temperature evaporator equipped with an ultrasound oscillatory system, where a temperature of removed air is decreased to a temperature lower than a temperature of external air. An evaporated cooling agent received heat from removed air is directed to the heating system to heat supply air.
EFFECT: provision of effective selection of heat from removed air and heating of supply air.
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