Patent ID: 7155921

Claim:
An air-conditioning system, comprising: a first cooling device, comprising a compressor that compresses refrigerant, an outdoor heat exchanger that exchanges heat between the refrigerant and outdoor air, an indoor heat exchanger that exchanges heat between the refrigerant and indoor air, a passage control device that alternatively guides the refrigerant compressed in the compressor to one of the outdoor heat exchanger and the indoor heat exchanger according to a driving mode, and an expansion device that is provided between the outdoor heat exchanger and the indoor heat exchanger and that expands the refrigerant; a second cooling device, comprising a blower that forcibly draws in outdoor air and blows the outdoor air into an interior, and a humidifying device that is provided at an outlet side of the blower and that supplies moisture to outdoor air passing through the blower; a humidity sensor that measures humidity of outdoor air; and a control unit that is electrically connected to the first cooling device, the second cooling device and the humidity sensor, and that alternatively drives one of the first cooling device and the second cooling device according to outdoor air humidity transmitted from the humidity sensor in a cooling mode, wherein the first cooling device is operated by using the compressor to circulate the refrigerant and cool the interior when humidity of outdoor air is higher than predetermined humidity, and wherein the second cooling device is operated by drawing in outdoor air with low relative humidity, increasing the relative humidity through a humidifying and cooling process, and providing the cooled air into the interior to cool the interior when humidity of outdoor air is lower than predetermined humidity.