Patent ID: 8302875

Claim:
An airconditioning equipment, comprising: a refrigerant pipe; an in-room unit which is connected to one end of the refrigerant pipe; and an out-room unit which is connected to the other end of the refrigerant pipe; wherein the in-room unit includes a first coupler which couples an electric signal to the refrigerant pipe, so as to transmit a radio wave signal generated by the coupling, to the out-room unit along a surface layer of the refrigerant pipe, and which extracts a radio wave signal transmitted from the out-room unit and then converts the radio wave signal into an electric signal and wherein the out-room unit includes a second coupler which couples an electric signal to the refrigerant pipe, so as to transmit a radio wave signal generated by the coupling, to the in-room unit along the surface layer of the refrigerant pipe, and which extracts a radio wave signal transmitted from the in-room unit and then converts the radio wave signal into an electric signal.