Air conditioning device for vehicle

An air conditioning device for a vehicle comprising:

• a second heating medium circuit through which a heating medium circulates;
• a compressor for drawing and discharging a refrigerant;
• a high-pressure side heat exchanger for heating the heating medium by exchanging heat between the refrigerant that is discharged by the compressor and the heating medium that circulates through the second heating medium circuit;
• an air heating heat exchanger for heating air by exchanging heat between the heating medium heated in the high-pressure side heat exchanger and the air that is to be blown into a vehicle cabin;
• a pressure reduction part for expanding and decompressing the refrigerant that is heat exchanged in the high-pressure side heat exchanger;
• a first low-pressure side heat exchanger for exchanging heat between the heating medium and the refrigerant that is expanded and decompressed in the pressure reduction part;
• a first heating medium circuit through which the heating medium can circulate;
• a second low-pressure side heat exchanger for cooling the heating medium by exchanging heat between the refrigerant that is expanded and decompressed in the pressure reduction part and the heating medium that circulates through the first heating medium circuit;
• and
• a heating medium-outside air heat exchanger for causing the heating medium to absorb heat by exchanging heat between the outside air and the heating medium that is cooled in the second low-pressure side heat exchanger, wherein
• the heating medium heated in the high-pressure side heat exchanger is capable of being introduced to the first low-pressure side heat exchanger.

An air conditioning device for a vehicle comprising:

• a compressor for supplying a high-pressure refrigerant by drawing and discharging a refrigerant;
• an air heating heat exchanger for heating air that is to be blown into a vehicle cabin;
• an expansion valve for expanding and decompressing the high-pressure refrigerant so as to supply an intermediate-pressure refrigerant and a low-pressure refrigerant;
• a first low-pressure side heat exchanger for exchanging heat between the intermediate-pressure refrigerant and a heating medium other than the air;
• a second low-pressure side heat exchanger for cooling the heating medium by exchanging heat between the low-pressure refrigerant and the heating medium;
• a first heating medium circuit through which the heating medium cooled in the second low-pressure side heat exchanger can circulate;
• a heating medium-air heat exchanger for causing the heating medium to absorb heat by exchanging heat between the air and the heating medium circulating through the first heating medium circuit;
• a high-pressure side heat exchanger for heating the heating medium by exchanging heat between the high-pressure refrigerant and the heating medium;
• and
• a second heating medium circuit through which the heating medium heated in the high-pressure side heat exchanger can circulate, wherein
• the first low-pressure side heat exchanger is connected to at least one of the first heating medium circuit and the second heating medium circuit.