A heat pump device 20 is operated so as to make a switch between multiple operation modes including a first dehumidification and heating operation mode in which a refrigerant discharged from a compressor is circulated through a downstream interior heat exchanger 31, a first pressure reducing valve 52, an upstream interior heat exchanger 32, and an exterior heat exchanger 33 in this order so that the heat exchanger 31 functions as a radiator and the heat exchanger 32 functions as a heat absorber, and a second dehumidification and heating operation mode in which the refrigerant discharged from the compressor is circulated through the downstream interior heat exchanger 31, a second pressure reducing valve 53, the exterior heat exchanger 33, and the upstream interior heat exchanger 32 in this order so that the heat exchanger 31 functions as a radiator and the heat exchanger 32 functions as a heat absorber.

Disclosed are an air conditioning system (100) for a vehicle and a vehicle having same. An air conditioning system (100) includes: a compressor (1), having a compressor inlet (11) and a compressor outlet (12); a first plate heat exchanger (2), having a pair of first inlet (21) and first outlet (22), and a pair of second inlet (23) and second outlet (24); a heat radiator (3), connected between the second inlet and the second outlet; an external air heat exchanger (72), disposed downstream of the first plate heat exchanger; a second plate heat exchanger (71), including a pair of third inlet (711) and third outlet (712), and a pair of fourth inlet (713) and fourth outlet (714); a motor radiator (74), connected between the fourth inlet and the fourth outlet; a first throttle control assembly (5), disposed between the first outlet and an inlet of the external air heat exchanger; and an internal refrigeration assembly, disposed between the compressor inlet and the third outlet.

A refrigerating cycle apparatus includes: a compressor that compresses and discharges refrigerant; a radiator that makes the refrigerant discharged out of the compressor to radiate heat; a pressure reducing device that decompresses the refrigerant flowing out of the radiator; an evaporator that evaporates the refrigerant decompressed by the pressure reducing device; and a decompression control part that controls operation of the pressure reducing device. The decompression control part controls the operation of the pressure reducing device in a manner that a physical quantity which has correlation with a pressure of the refrigerant in the evaporator approaches a predetermined defrosting standard value when a time-priority defrosting mode is set.

There is disclosed a vehicle air conditioner of a heat pump system in which there is prevented or inhibited frosting to an outdoor heat exchanger when heating in a vehicle interior is beforehand performed during plug-in, thereby realizing comfortable heating in the vehicle interior during running and also extending a running distance. The vehicle air conditioner includes a heating medium circulating circuit 23 to heat air to be supplied from an air flow passage 3 to a vehicle interior, a controller has frosting estimation means for estimating frosting to an outdoor heat exchanger 7, and when a heating mode is executed in a state where a power is supplied from an external power source to a compressor 2 or a battery which supplies the power to drive the compressor 2, the controller executes the heating by a heating medium circulating circuit 23, in a case where the frosting to the outdoor heat exchanger 7 is predicted on the basis of the estimation of the frosting estimation means.

A vehicle air conditioner includes an air-heating switching portion that switches between a first air-heating mode of heating ventilation air by a heating heat exchanger and a second air-heating mode of heating the ventilation air by a condenser. The vehicle air conditioner includes a heat-exchange adjustment portion that adjusts an amount of heat exchange between the high-pressure refrigerant and the ventilation air in the condenser, and a heat-exchange control unit that controls the heat-exchange adjustment portion. The heat-exchange control unit controls the heat-exchange adjustment portion to decrease the amount of heat exchange between the high-pressure refrigerant and the ventilation air in the condenser if a condition satisfies in which temperature of the refrigerant in the condenser is equal to or lower than temperature of the ventilation air heated by a heating heat exchanger before passing through the condenser, when the air-heating switching portion switches from the first air-heating mode to the second air-heating mode.

A heat pump device includes an air conditioning control device configured to switch the heat pump device among a plurality of operation modes including an air-heating operation mode in which an indoor heat exchanger serves as a radiator and an outdoor heat exchanger serves as a heat absorber, and an air-cooling operation mode in which the indoor heat exchanger serves as a heat absorber and the outdoor heat exchanger serves as a radiator. The air conditioning control device switch a refrigerant pipe such that refrigerant is, in the air-cooling operation mode, supplied to part of the outdoor heat exchanger serving as a refrigerant inlet in the air-heating operation mode.

A vehicle air conditioner which improves the frost formation judging precision of an outdoor heat exchanger, acquires the heating performance, and avoids unnecessary defrosting. A controller executes a heating mode. The controller (32) judges frost formation onto the outdoor heat exchanger (7) on the basis of a refrigerant evaporation pressure PXO of the outdoor heat exchanger (7) and a refrigerant evaporation pressure PXObase of the outdoor heat exchanger (7) during non-frost formation or on the basis of a refrigerant evaporation temperature TXO of the outdoor heat exchanger (7) and a refrigerant evaporation temperature TXObase of the outdoor heat exchanger (7) during the non-frost formation, and allows a high-temperature refrigerant gas to flow through the outdoor heat exchanger (7), thereby performing defrosting of the outdoor heat exchanger (7).

There is disclosed a vehicle air conditioner capable of preventing or inhibiting deterioration of a vehicle interior heating capability which is caused by frost formation to an outdoor heat exchanger. The vehicle air conditioner includes a compressor 2, an air flow passage 3, a radiator 4, a heat absorber 9, and an outdoor heat exchanger 7, and executes a heating mode in which a refrigerant discharged from the compressor radiates heat in the radiator, is decompressed and then absorbs heat in the outdoor heat exchanger. The vehicle air conditioner includes an accumulator 12 disposed on a suction side of the compressor, and a bypass circuit 24B disposed from a refrigerant outlet side of the radiator to an inlet side of the accumulator. A controller has a mode in which the refrigerant flowing out from the radiator is passed through the bypass circuit, does not flow through the outdoor heat exchanger, but flows into the accumulator.

A method of detecting and mitigating icing of an outside heat exchanger in an electric vehicle including a heat pump. Various sources of heat may be utilized to de-ice an outside heat exchanger of the heat pump. The sources of heat may include one or more of vehicle electronics, a high voltage (HV) battery, and an HV coolant heater. Pre-defined criteria may be utilized to determine the actions to be taken to de-ice the outside heat exchanger and/or to prevent icing of the outside heat exchanger.

A vehicle air conditioner includes a compressor, a heating unit, an outside air heat exchanger, a wind speed regulation unit, and a controller. The controller includes a melting control unit, a dry control unit, and a dry completion determination unit. In a dry defrosting mode, the melting control unit performs melting-defrosting to melt frost adhering to the outside air heat exchanger. The dry control unit performs a dry defrosting in which at least one of the amount of heat in a predetermined range or a wind speed regulated in a predetermined range by the wind speed regulation unit is supplied to residual water adhering to the outside air heat exchanger, due to melting of frost in the melting-defrosting, to dry the residual water. The dry completion determination unit determines whether drying of the residual water in the outside air heat exchanger is completed, in the dry defrosting.