Evaporator for partial or complete evaporation of a flow of liquid

The evaporator has gaseous heat carriers provided on a primary side. A heat carrier inlet (5) and a heat carrier outlet (6) are extended along a first flow channel. Flow-conductive of the gaseous heat carriers is disconnected, and extends along a longitudinal axis of the evaporator parallel to the heat carrier inlet and the outlet. A secondary side is provided with a second flow channel. A common liquid inlet (17) and a common vapor outlet (18) are provided in the secondary side. A third flow channel is provided with a cooling medium inlet (19) and a cooling medium outlet (20). An independent claim is also included for a waste heat utilizable system.