Patent ID: 7805961

Claim:
A supercooling apparatus of a simultaneous cooling and heating type multiple air conditioner, comprising: a low-pressure pipe connected to an inlet side of a compressor; a liquid pipe header connected to an outlet side of an outdoor heat exchanger; a plurality of branch liquid pipes branched from the liquid pipe header and connected to a plurality of indoor heat exchangers, respectively; and a supercooling device configured to cool refrigerant passing through the branch liquid pipes, wherein the supercooling device comprises: a main supercooling pipe having one end connected to the liquid pipe header; a supercooling expansion valve configured to expand the refrigerant passing through the main supercooling pipe; branch supercooling pipes branched from an other end of the main supercooling pipe and connected to the low-pressure pipe, each branch supercooling pipe having no additional expansion element of any kind; and supercooling heat exchangers mounted at each of the branch liquid pipes to perform heat exchange such that the refrigerant passing through the branch liquid pipes is cooled by performing heat exchange with the refrigerant passing through the branch supercooling pipes.