A refrigerant shortage determination unit (S2, S3, S6, S8, S9) determines that refrigerant is in shortage state if a high pressure side refrigerant pressure (Pd) between a discharge port of a compressor (11) and an inlet of a decompression unit (13) is lower than a predetermined first reference pressure (KPd1) when an outside air temperature (Tam) is equal to or higher than a predetermined reference outside air temperature (KTam), and determines that refrigerant is in shortage state if the high pressure side refrigerant pressure (Pd) is lower than a predetermined second reference pressure (KPd2) in a state where the compressor (11) is operated when the outside air temperature (Tam) is lower than the reference outside air temperature (KTam). A compressor control unit (S4) reduces a refrigerant discharge capacity of the compressor (11) when the refrigerant shortage determination unit determines that refrigerant is in the shortage state.


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    Title :

    HEAT PUMP CYCLE


    Additional title:

    WÄRMEPUMPENKREISLAUF
    CYCLE DE POMPE À CHALEUR


    Contributors:

    Publication date :

    2018-03-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    F25B Kältemaschinen, Kälteanlagen oder Kälteverfahren , REFRIGERATION MACHINES, PLANTS, OR SYSTEMS / B60H ARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES , Anordnung oder Einbau der Heizung, Kühlung, Lüftung oder anderer Luftbehandlungsvorrichtungen für die Fahrzeugräume für Reisende oder Fracht



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