Abstract: A heat exchanger is disclosed having a first cylindrical tube and a lead screw which extends coaxially inside the first cylindrical tube; the inner surface of the first cylindrical tube has guiding grooves, and a cleaning element is secured to the lead screw in such a way that a rotating movement of the lead screw moves the cleaning element in the axial direction along the guiding grooves.

Abstract: A heat exchanger is disclosed having a first cylindrical tube and a lead screw which extends coaxially inside the first cylindrical tube; the inner surface of the first cylindrical tube has guiding grooves, and a cleaning element is secured to the lead screw in such a way that a rotating movement of the lead screw moves the cleaning element in the axial direction along the guiding grooves.

Abstract: The invention relates to a method for separating water from a gaseous working medium (2), at least the following steps being carried out: providing an ionic hygroscopic liquid (4) in a reaction chamber (3); supplying the water-containing working medium (2) and conducting the working medium (2) through the ionic liquid (4), wherein water bonds with the ionic liquid (4) and is thereby separated from the working medium; and discharging the dried working medium (7). The invention further relates to a corresponding water separator (1) and to a water separator system (15).

Abstract: A collecting tank, for a potentially flammable or explosive environment, includes: a collecting chamber for fluid having a condensate inlet; and a suction opening for extracting fluid. The tank also includes: a Venturi nozzle fluidically connected to the suction opening to generate a vacuum in the suction opening; a pressure medium inlet fluidically connected upstream of the Venturi nozzle to generate a vacuum in the suction opening when pressure medium is introduced into the Venturi nozzle; and an extraction outlet fluidically connected downstream of the Venturi nozzle and to the suction opening, for extracting fluid from the collecting chamber. Methods of operation for the collecting tank and a hydrogen-powered vehicle utilizing the collecting tank are also described.