Humidifier for use with a fuel cell

摘要

A humidifier 21 for use with a fuel cell 1, including a plurality of combined water permeable membranes or water permeable devices 21, each of the water permeable membranes or water permeable devices generating humidified gas by flowing therein different gases with different moisture contents and by moisture exchanging between the different gases so that one dry gas with smaller moisture content is humidified with the other moist gas with larger moisture content; and flowing passage switching devices Va for optionally switching flowing passages Ca of the dry gas. The flowing passage switching devices Va switches the flowing passage Ca in accordance with a required amount of the humidified gas so as to selectively use particular water permeable membranes or a particular water permeable device 21 from among the plurality of water permeable membranes or water permeable devices 21.