Air conditioner

1. An air conditioner comprising:

an indoor heat exchange unit to perform a heat exchange process by the supply and absorption of heat through the circulation of a first refrigerant;

at least one outdoor heat exchange unit to perform a heat exchange process by the absorption and supply of heat through the circulation of a second refrigerant;

an intermediate connection unit to perform a heat exchange between the first refrigerant and the second refrigerant;

a first refrigerant pipe connected between the intermediate connection unit and the indoor unit; and

a second refrigerant pipe connected between the intermediate connection unit and the at least one outdoor heat exchange unit,

wherein the intermediate connection unit includes a case, at least one first compressor within the case to compress the first refrigerant, at least one second compressor within the case to compress the second refrigerant, and a hybrid device to perform heat exchange between the first refrigerant and the second refrigerant,

wherein the at least one outdoor heat exchange unit is installed separately from the intermediate connection unit, and the at least one outdoor heat exchange unit is selectively connected to the intermediate connection unit, and

wherein the at least one outdoor heat exchange unit includes at least two of an air-cooled heat exchanger, an engine exhaust heat exchanger, a water-cooled heat exchanger, a ground source heat exchanger, and an electric heat exchanger.

2. The air conditioner according to claim 1 , wherein the intermediate connection unit includes:

a first flow passage controller to control the flow of the first refrigerant between the intermediate connection unit and the indoor heat exchange unit; and

a second flow passage controller to control the flow of the second refrigerant between the intermediate connection unit and the at least one outdoor heat exchange unit.

3. The air conditioner according to claim 1 , wherein the hybrid device includes a thermal conductive fluid contained in the case such that the first refrigerant and the second refrigerant are heat-exchanged with each other via the thermal conductive fluid.

4. The air conditioner according to claim 1 , further comprising:

a first valve system located in the first refrigerant pipe to control the flow of the refrigerant flowing through the first refrigerant pipe; and

a second valve system located in the second refrigerant pipe to control the flow of the refrigerant flowing through the second refrigerant pipe.

5. The air conditioner according to claim 4 , further comprising a valve controller for controlling the opening and closing of the first valve system and the second valve system.

6. The air conditioner according to claim 5 , wherein the indoor heat exchange unit includes a plurality of sub-indoor units, the first valve system includes a plurality of first valves, each of the plurality of first valves being associated with a corresponding sub-indoor unit, and the valve controller controls the plurality of first valves so as to simultaneously or selectively connect the intermediate connection unit and the sub-indoor units.

7. The air conditioner according to claim 5 , wherein the at least one outdoor heat exchange unit includes a plurality of outdoor heat exchange units, the second valve system includes a plurality of second valves, each of the plurality of second valves is associated with a corresponding one of the plurality of outdoor heat exchange units, and the valve controller controls the plurality of second valves so as to simultaneously or selectively connect the intermediate connection unit and the outdoor heat exchange units.