HVAC system of vehicle

1. A heating, ventilating, and air conditioning (HVAC) system of a vehicle, the HVAC system comprising:

a battery cooling line provided to circulate a first coolant through a first radiator, a battery core, and a first valve;

an electronic component cooling line provided to circulate a second coolant through a second radiator, an electronic component core, and a second valve;

a branch line provided to have a first end portion branched from the first valve and a second end portion connected to an upstream point of the battery core, wherein a main heat exchanger is disposed between the first end portion and the second end portion of the branch line;

an auxiliary line provided to have a first end portion branched from the second valve and a second end portion connected to an upstream point of the electronic component core, and to pass through the main heat exchanger to perform a heat transfer with the branch line; and

a controller configured for circulating the first coolant and the second coolant in the branch line and the auxiliary line, respectively, and performing the heat transfer in the main heat exchanger by controlling the first valve and the second valve when a temperature of the battery core is required to be increased.

2. The HVAC system of claim 1 , wherein the branch line and the auxiliary line configure respectively independent flow passages, and a coolant of the branch line and a coolant of the auxiliary line perform the heat transfer with each other in the main heat exchanger.

3. The HVAC system of claim 1 , wherein the first valve is a three-way valve, and includes a first port of the battery core side, a second port of a first end side of the branch line, and a third port of a first radiator side,

the controller is configured to close the third port of the first valve when the temperature of the battery core is required to be increased, and

the controller is configured to close the second port of the first valve when a cooling of the battery core through heat radiation of the first radiator is required.

4. The HVAC system of claim 1 , wherein the second valve is a three-way valve, and includes a first port of the electronic component core side, a second port of a first end side of the auxiliary line, and a third port of a second radiator side, and

the controller is configured to open all of the ports of the second valve when the temperature of the battery core is required to be increased, and closes the second port of the second valve when the temperature of the battery core is not required to be increased.

5. The HVAC system of claim 1 , wherein the battery cooling line includes a first pump,

the electronic component cooling line includes a second pump, and

the controller is configured to perform a control to drive or stop the first pump or the second pump.

6. The HVAC system of claim 5 , wherein the first pump is disposed between an upstream point of the first valve and the second end portion of the branch line on the battery cooling line.

7. The HVAC system of claim 5 , wherein the second pump is disposed between an upstream point of the second valve and the second end portion of the auxiliary line on the electronic component cooling line.

8. The HVAC system of claim 1 , wherein the battery cooling line includes an auxiliary heat exchanger provided thereon, and

the auxiliary heat exchanger is disposed between a downstream point of the battery core and an upstream point of the first valve.

9. The HVAC system of claim 8 , wherein the battery cooling line is configured to perform the heat transfer with a refrigerant line for an indoor HVAC through the auxiliary heat exchanger, and the first coolant performing the heat transfer with the refrigerant line at a time of cooling of the battery core cools the battery core.

10. The HVAC system of claim 8 , wherein the refrigerant line includes a third valve that supplies or blocks a refrigerant so that the heat transfer between the refrigerant of the refrigerant line and the first coolant of the battery cooling line is performed in the auxiliary heat exchanger.

11. The HVAC system of claim 9 , wherein in a case of a cooling mode, the controller is configured to connect the battery cooling line and the branch line with each other by controlling the first valve, and is configured to perform a control so that the first coolant cooled by performing the heat transfer with a refrigerant of the refrigerant line through the auxiliary heat exchanger cools the battery core.

12. The HVAC system of claim 9 , wherein in a case of a battery temperature increasing mode, the controller is configured to perform a control so that the second coolant cooling the electronic component cooling line and the first coolant perform the heat transfer in the main heat exchanger to increase the temperature and then increase the temperature of the battery core, by controlling the first valve to connect the battery cooling line and the branch line with each other and fully opening the second valve to connect the electronic component cooling line and the auxiliary line with each other.

13. The HVAC system of claim 9 , wherein in a case of a natural cooling mode, the controller is configured to perform a control to circulate the first coolant in the battery cooling line by controlling the first valve, and is configured to perform a control so that the first coolant cooled through the first radiator cools the battery core.

14. The HVAC system of claim 1 , wherein the branch line includes an electric heater configured for increasing a temperature of the first coolant, and

the electric heater is disposed between the first end portion of the branch line and the upstream point of the battery core.