HVAC system for vehicle

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

a heating body positioned inside an HVAC duct of the vehicle, formed between a first electrode portion and a second electrode portion having polarities opposite to each other wherein the heating body includes a first heat generation region and a second heat generation region which are configured to generate heat when the heating body is electrified to increase a temperature of an air being transported through the HVAC duct,

wherein each of the first heat generation region and the second heat generation region includes a plurality of rib portions connected to the first electrode portion and the second electrode portion, and

wherein the plurality of rib portions in the first heat generation region has a same length to each other and the plurality of rib portions in the second heat generation region has a different length to each other.

2. The HVAC system of claim 1 , wherein the heating body is positioned at a discharge port of the HVAC duct.

3. The HVAC system of claim 1 , wherein the heating body is a carbon nano tube (CNT) heating body.

4. The HVAC system of claim 3 , wherein the plurality of rib portions are spaced from one another at predetermined intervals between the first electrode portion and the second electrode portion.

5. The HVAC system of claim 4 , wherein one of the plurality of rib portions in the second heat generation region is formed to have a longest length among the plurality of rib portions.

6. The HVAC system of claim 5 , wherein the one of the plurality of rib portions is positioned between an uppermost rib portion and a lowermost rib portion among the plurality of rib portions.

7. The HVAC system of claim 3 ,

wherein the HVAC duct includes a door trim HVAC duct positioned at a door trim of the vehicle, and

wherein the CNT heating body is positioned on the door trim HVAC duct.

8. The HVAC system of claim 7 , wherein a discharge port of the door trim HVAC duct is formed toward a bottom surface of the vehicle.

9. The HVAC system of claim 3 ,

wherein the HVAC duct includes a rear seat HVAC duct for air blowing to a rear seat of the vehicle, and

wherein the CNT heating body is positioned on the rear seat HVAC duct.

10. The HVAC system of claim 9 , wherein the rear seat HVAC duct is configured to communicate with a B pillar of the vehicle.

11. The HVAC system of claim 10 , wherein a discharge port of the rear seat HVAC duct is positioned at an upper end portion of the B pillar.

12. The HVAC system of claim 11 , wherein the discharge port of the rear seat HVAC duct is formed in a side surface direction toward an interior of a cabin of the vehicle.

13. The HVAC system of claim 3 , wherein the CNT heating body is integrally formed with the HVAC duct during forming of the HVAC duct.

14. The HVAC system of claim 1 , wherein the plurality of rib portions is formed in parallel to an air blowing direction of the HVAC duct.

15. The HVAC system of claim 1 , wherein the first electrode portion and the second electrode portion are positioned on an internal wall of the HVAC duct.

16. The HVAC system of claim 1 , wherein the first heat generation region is in a shape of a rectangle.

17. The HVAC system of claim 16 , wherein the second heat generation region is in a shape of a trapezoid.

18. The HVAC system of claim 17 , wherein the first heat generation region is deployed toward an external side of the vehicle.

19. The HVAC system of claim 18 , wherein the second heat generation region is deployed toward an indoor side of the vehicle.

20. The HVAC system of claim 1 , wherein the second heat generation region is in a shape of a trapezoid.