Abstract: A humidifier with an integrated water separator for a fuel cell system, including a housing with a first channel for a first gas stream and a second channel for a second gas stream, a humidifier area in which the first channel and the second channel are separated from one another by a water vapor-permeable membrane, and a collection container for collecting the deposited liquid water is provided. It is provided that a water separator for separating liquid water is situated in the humidifier area.

Abstract: A fuel cell system (1) in which a water separator (110) for separating liquid water from an exhaust gas (6, 4) of a fuel cell (10) of the fuel cell system (1) is fluid-mechanically coupled into an exhaust gas path (32, 22) of the fuel cell system. A water recirculator (120) is fluid-mechanically coupled into the fuel cell system (1), with the aid of which at least a portion of the water of the water separator (110) is once again providable to the fuel cell (10). Moreover, a method for recirculating water in a fuel cell system (1), in which liquid water of a fuel cell supply (30, 20) of the fuel cell system (1) is withdrawn at a removal site at/in the fuel cell supply (30, 20). The water upstream from the removal site is provided to the same fuel cell supply (30, 20) and/or to some other fuel cell supply (20, 30) of the fuel cell system (1).

Abstract: A moisture exchanger (10) for transferring moisture between two gases, including a plurality of hollow fiber membranes (12). The moisture exchanger (10) includes at least one partition (34) between the hollow fiber membranes (12) and in that the plurality of hollow fiber membranes (12) is subdivided, at least in a section (36) of the length thereof, into zones (38) that are connected in parallel.