Patent ID: 8033532

Claim:
A humidifier, comprising: a water circuit which has a first heat exchanger and a second heat exchanger connected thereto and through which waters of cold water and hot water flow, the first heat exchanger and the second heat exchanger each having an adsorbent and adsorbing moisture in air and desorbing the moisture to discharge the moisture into the air, wherein: the water circuit switches flow of the water between a first flow state, in which the hot water introduced from a first inlet flows through the first heat exchanger and flows to a first outlet and in which the cold water introduced from a second inlet flows through the second heat exchanger and flows to a second outlet, and a second flow state, in which the hot water introduced from the first inlet flows through the second heat exchanger and flows to the first outlet and in which the cold water introduced from the second inlet flows through the first heat exchanger and flows to the second outlet, and adsorbs and desorbs the moisture alternately by the first heat exchanger and the second heat exchanger; and the water circuit has bypass passages for connecting the respective inlets to the respective outlets at a time of switching the flow of the water.