Abstract: The invention relates to a device for multi-stage heat exchange and to a method for producing one such device, whereby at least three free-flowing media (fluids) are used in three flow devices subdivided into at least two heat-exchanging or flow modules. Said modules respectively consist of at least two flow elements that are arranged in such a way that different fluids alternately flow through the same. For essentially liquid fluids, the fluids are distributed to the flow elements by means of fluid collecting devices or fluid distributing devices connected in a gas-tight and liquid-tight manner. The main flow directions of all fluids in the flow elements are in essentially parallel planes. At least two flow modules are directly mounted in series and/or by means of fluid distributing devices in a flow-connected manner at least in relation to one flow device.

Abstract: A process for heating the passenger compartment (10) in a motor vehicle, particularly an electric vehicle, having a heating device (12), which is supplied with an air current (40) extracted, via a waste-air duct (11), from the passenger compartment (10). The air current enters into the passenger compartment (10) from the heating device (12) via an intake-duct (13). In order to prevent internal misting of the vehicle's windows, even with a low heating capacity, at least one partial air current (40a), which is branched off from the air current (40) prior to entry into the passenger compartment (10), flows through a sorbent (15) such as zeolite or the like.