Patent ID: 7992403

Claim:
An air conditioning system using ground heat, the system comprising: at least one indoor unit for conditioning indoor air; at least one outdoor unit communicating with the at least one indoor unit and including an outdoor heat exchanger where heat exchange occurs; a plurality of pipes installed between the at least one indoor unit and the at least one outdoor unit to guide flowing of a coolant; a coolant distributor installed between the plurality of pipes, the coolant distributor configured to control coolant supplied to the at least one indoor unit or the at least one outdoor unit; a ground heat exchanger provided at one side of the outdoor heat exchanger of the at least one outdoor unit, and laid under the ground to allow heat to be exchanged between ground heat and a circulating medium circulating through the ground heat exchanger; a circulating pipe configured to connect the outdoor heat exchanger with the ground heat exchanger to guide circulation of the circulating medium; and a plurality of auxiliary heat sources installed on the circulating pipe to heat or cool down the circulating medium, wherein two or more auxiliary heat sources of the plurality of auxiliary heat sources are simultaneously used, or one of them is selectively used, wherein the circulating medium that flows through the ground heat exchanger is introduced into the one of the plurality of auxiliary heat sources.