PURPOSE: To improve a high lifting performance of a system and reduce an amount of enclosed refrigerant in a multi-chamber type cooling or heating device in which a refrigerant cycle at a heat source side and another refrigerant cycle at a utilizer are separated by a method wherein a proper amount of gaseous refrigerant within a small liquid side connection pipe is mixed with refrigerant under an over-cooled state in which a condensed and liquefied state is attained with a heat exchanger at the utilizer during a heating operation.
CONSTITUTION: The first flow rate valve 14a for refrigerant is connected to a heat exchanger 12a of an indoor device b1, and the second flow rate valve 15a is arranged in parallel with the first flow rate valve 14a. Temperature sensing devices 16a and 17a for detecting refrigerant temperatures at an outlet of the indoor device and the outlet of the second flow rate valve 15a are provided. A control device 18a adjusts a degree of opening of the second flow rate valve 15a in response to the detected temperature. Accordingly, since a proper amount of saturated gas in a small liquid branch pipe d1 is mixed in a multi-liquid branch pipe (e1), a resistance caused by a weight of the liquid refrigerant within the multi-liquid side connection pipe (c) and a proper refrigerant circulation can be attained even if a high height difference is found between the refrigerant transporting device 11 and the indoor devices (b1, b2) and further an amount of enclosed gas can be reduced. As for the indoor device (b2) a similar state can be attained.
KURACHI MASAO
YANO KENICHIRO
MARUMOTO KAZUHIKO
