Air conditioning system for vehicle

An air conditioning system for a vehicle comprising:

• an air-conditioning case having a cold air passageway extending in an air flow direction and having a heat exchanger for cooling, and a warm air passageway extending in the air flow direction and having a heat exchanger for heating;
• wherein the warm air passageway defines a warm air outflow port to an interior of the vehicle and a warm air discharge port to an exterior of the vehicle, wherein the cold air passageway defines a cold air outflow port to an interior of the vehicle and a cold air discharge port to an exterior of the vehicle, wherein a warm air mode door is configured to open and close the warm air outflow port and warm air discharge port, and wherein a cold air mode door is configured to open and close the cold air outflow port and cold air discharge port;
• an air blower which is mounted at an inlet of the air-conditioning case to blow air through the cold air passageway and the warm air passageway;
• an indoor and outdoor air supplying means which is connected to the air blower to supply indoor air and outdoor air;
• wherein the air blower comprises a first blower for blowing air to the cold air passageway and a second blower for blowing air to the warm air passageway;
• wherein the first blower includes a scroll case which is connected to the inlet of the cold air passageway of the air-conditioning case, a blast fan rotatably mounted inside the scroll case, an inlet ring which is formed on one side of the scroll case to induce indoor air and outdoor air, and a motor which is mounted on the other side of the scroll case to rotate the blast fan;
• wherein the indoor and outdoor air supplying means comprises:
• an intake duct which is communicatingly connected with the first and second blowers and has an indoor air inlet and an outdoor air inlet;
• a first indoor and outdoor air converting door which selectively opens the outdoor air inlet and the indoor air inlet relative to the first blower;
• a second indoor and outdoor air converting door which selectively opens the outdoor air inlet and the indoor air inlet relative to the second blower;
• wherein the first blower and the second blower are spaced from one another in a horizontal direction;
• wherein the intake duct is mounted between the first blower and the second blower in the horizontal direction and extends continuously in a vertical direction being perpendicular to the horizontal direction between an upper part defining the outdoor air inlet and a lower part defining the indoor air inlet;
• wherein the first and second indoor and outdoor air converting doors are positioned in the intake duct between the outdoor air inlet and the indoor air inlet in the vertical direction, and between the first and second blowers in the horizontal direction;
• a controller configured to control the indoor and outdoor air supplying means and the first and second indoor and outdoor air converting door, wherein in a heating mode and in a dehumidification mode, the controller is configured to move the warm air mode door to open the warm air outflow port to the interior of the vehicle and to close the warm air discharge port to the exterior, to move the cold air mode door to close the cold air outflow port to the interior and to open the cold air discharge port to the exterior, to move the first indoor and outdoor air converting door to open the indoor air inlet relative to the first blower in order to allow heated air from the interior of the vehicle to exchange heat while passing over the evaporator so as to prevent frosting of the evaporator and enhance heating performance by increasing refrigerant pressure and temperature.