A heat pump cycle device includes a control unit that executes control switching between a first heating mode and a second heating mode. In the first heating mode, all refrigerant discharged from a compressor flows into a heating unit via a branch portion....

The air conditioning device has a line system (10) for refrigerant and multiple air conditioning elements, such as compressor (12), a main condenser (14) fluidly connected downstream the compressor and a vaporizer (161a) with a fluidic upstream connected a...

The disclosed operation method of a heat pump-type vehicle air conditioning system (10) involves a step for setting a cold operating mode for raising the output air temperature of the air conditioner by means of a heater (26) or a normal operating mode for...

Provided is a vehicle air conditioning device with a simple structure which can quickly raise the temperature of engine cooling water used for heating the air in a vehicle cabin in an engine start period in a low ambient temperature. The vehicle air condit...

A vehicular air-conditioning system (10) has a heat pump circulation passage (18) for circulating a coolant with a compressor (16), To the heat pump circulation passage (18), there are connected a condenser (20) for performing a heat exchange between a coo...

The system can be operated in air-conditioning mode (Fig. 2) or in heat pump mode (Fig. 3) to cool and heat, respectively, a defined space such as the passenger compartment of a vehicle. The system has a compressor (1), an external cooler (3), a first inte...

An expansion valve's (10) opening combines with a compressor's (1) outlet. A second vaporizer (11) operates as a heat pump. A refrigerant pipe (12) forms a main circuit with a refrigerant radiator (2) as a refrigerant liquefier downstream to the compressor...

A refrigeration cycle is switched from a refrigeration cycle circuit to a hot gas heater circuit to make the hot gas discharged from a compressor flow into an evaporator and heat the vehicle passenger compartment, at which time, when a suction pressure (Ps...

In a freezing cycle apparatus that switches between a cooling mode and a heating mode, wherein a low-pressure refrigerant is evaporated in an evaporator 18 for cooling the air during a cooling mode and a hot gas refrigerant is introduced from the discharge...