HEAT EXCHANGER AND METHOD FOR PRODUCTION THEREOF

The invention concerns a heat exchanger for transmitting heat from a heating medium, in particular from the exhaust gas stream of an internal combustion engine, to a working fluid, which evaporates in the heat exchanger, comprising an alternating stacking order made of guiding layers for the heating medium and guiding layers for the working fluid; wherein the heating medium and the working fluid are injected in the cross counterflow; whereas each guiding layer for the working fluid comprises a channel plate, which has at least one meandering passage opening, whereas cover plates are arranged on both sides of the channel plate, which cover plates seal laterally the passage opening by forming a working fluid channel, except for an inlet and an outlet, wherein the channel plate is materially connected to the cover plates; and whereas the working fluid channel includes a first section, outgoing from the inlet, with a first free cross-section and a second section emerging in the outlet, with a second free cross-section, which is larger than the first free cross-section.