FIELD: heating.
SUBSTANCE: at heat recovery during simultaneous operation of some internal units for cooling, and others - for heating, there controlled is temperature difference between air temperature at the inlet of external unit and air temperature at the outlet of external unit by switching over operating modes of internal units, and air temperature at the inlet of external unit is maintained within the specified range by bypassing some portion of waste air leaving the external unit to the inlet of external unit. System contains external unit with air heat exchanger to which through devices for switching over the modes there connected are internal units; at that, external unit is arranged in the casing so that inlet and outlet chambers and bypass channel are formed; at that, in inlet and outlet openings of the casing and in bypass channel there installed are adjustable dampers, and in inlet and outlet chambers there installed are air temperature sensors connected to inlet of control unit the outlet of which is connected to actuators of dampers.
EFFECT: increased efficiency and reliable operation of multi-zone system.
4 cl, 1 dwg
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