Evaporation from falling superheated water jets for application to open cycle ocean thermal energy conversion is considered. Analyses are performed to show that the interfacial resistance is of no importance to evaporator design and that evaporation is liquid side controlled. The heat exchanger performance is presented in terms of its effectiveness and change of bulk temperature. Unbroken planar and round jets and broken jets which are assumed to be composed of spherical droplets are considered. The analysis is shown to provide a rational basis for correlating experimental data for broken and unbroken jets. Corresponding desorption rates of dissolved noncondensable gas from water jets are then predicted.