Vehicle thermal management system

A vehicle thermal management system comprising:

• a refrigerant circuit including:
• a first compressor and a second compressor that are connected in series through a first flow passage and compress refrigerant;
• a condenser into which the refrigerant compressed by the second compressor is introduced and at which the refrigerant dissipates heat to a heating medium or outside air;
• a first expansion valve and a second expansion valve through which the refrigerant after flowing through the condenser is expanded;
• a first evaporation device into which the refrigerant expanded through the first expansion valve is introduced and at which the refrigerant absorbs heat from inside air, the first evaporation device being connected to the first flow passage through a second flow passage;
• and
• a second evaporation device into which the refrigerant expanded through the second expansion valve is introduced and at which the refrigerant absorbs heat from a cooling medium or the outside air, the second evaporation device being connected to the first compressor through a third flow passage;
• and
• a medium circuit including at least one of a heating medium circuit having a heating medium pump that circulates the heating medium and a heat dissipation device at which the heating medium dissipates heat to an object to be heated or a cooling medium circuit having a cooling medium pump that circulates the cooling medium and a heat absorption device at which the cooling medium absorbs heat from an object to be cooled, wherein
• the vehicle thermal management system performs at least one of the heat dissipation from the refrigerant compressed by the second compressor to the heating medium at the condenser or the heat absorption from the cooling medium to the refrigerant expanded through the second expansion valve at the second evaporation device.