Air conditioner for vehicle

An air conditioner for a vehicle, comprising:

• a refrigerant circulation system having a refrigerant and compressor, a condenser, an expansion means, and an evaporator;
• a first coolant pipe containing a coolant which exchanges heat with a battery system of the vehicle or a drive train component;
• a refrigerant branch pipe where some of the refrigerant at a rear end of the condenser and at the front end of the evaporator branches off to bypass the evaporator;
• a chiller disposed at the refrigerant branch pipe to exchange heat between the refrigerant of the refrigerant branch pipe and the coolant of the first coolant pipe;
• a second coolant pipe exchanging heat with at least one drive train component;
• wherein refrigerant of the refrigerant circulation system and coolant of the first coolant pipe are heat-exchanged selectively;
• wherein the first coolant pipe has a first circulation pump for circulating the coolant;
• wherein a valve system selectively connects the first coolant pipe and the second coolant pipe in sequence to circulate the coolant to at least one among the battery system and the drive train component;
• wherein the coolant exchanges heat with the battery system in the cooling mode, and exchanges heat with the drive train component in the heating mode;
• and
• wherein the battery system and the drive train component are connected in parallel with the chiller to cool the battery system in the cooling mode and recover waste heat of the drive train component in the heating mode.