Evaporator

A waste heat utilization device for an internal combustion engine, in a motor vehicle, the device comprising:

• a waste heat utilization circuit, in which a working medium circulates and comprising an expansion machine for expanding the working medium, a condenser for condensing the working medium, a conveying device for driving the working medium in the waste heat utilization circuit and an evaporator for evaporating the working medium the evaporator comprising:
• multiple channel plate arrangements, which are stacked in a stacking direction, wherein in each case between two adjacent channel plate arrangements a gas path is formed, through which a gas can be conducted, via which the heat required for evaporating the liquid can be supplied, wherein:
• each channel plate arrangement comprises a liquid inlet, a vapor outlet and a channel connecting the liquid inlet to the vapor outlet, which channel forms a repeatedly diverted evaporation path for the liquid to be evaporated;
• and
• the respective channel comprises at least in one evaporation zone of the evaporation path with a cross section, through which a flow can flow, which increases in the flow direction of the evaporating liquid.