Air conditioner and an air conditioning system having an integrated heat exchanger

An air conditioning system having an integrated heat exchanger, the air conditioning system comprising:

• a refrigerant circuit in which a refrigerant circulates and that includes a compressor, a condenser, an expander, and an evaporator;
• a first cooling water circuit in which first cooling water circulates to exchange heat with the condenser of the refrigerant circuit for heating;
• a second cooling water circuit in which second cooling water circulates to exchange heat with the evaporator of the refrigerant circuit for cooling;
• a valve module to which the first cooling water circuit and the second cooling water circuit are connected and that changes a flow direction of the first cooling water and the second cooling water;
• and
• an indoor heat exchanger that is disposed in the air conditioning housing, to which the first cooling water circuit and the second cooling water circuit are connected, and that receives the first cooling water for heating or the second cooling water for cooling and generates heating air or cooling air,
• wherein, in the air conditioning housing, a heater spaced apart from the indoor heat exchanger and configured to selectively generate heat is disposed, a bleed path is formed around the heater, and a door unit configured to adjust opening and closing of the bleed path is disposed.