 The cooling from the evaporation helps water condense on the dividing wall, while the energy from the condensing vapor, now turned to droplets, passes back to the evaporation side, and is absorbed in the evaporating sea water.This way, much of the energy (as heat) is left in the process, and is not removed with the air leaving the DewVaporation column.Various improvements have been proposed, among those reusing the output brine and adding external heat in a stacked way, so that the pressure and humidity gap between the two sides of the column are optimal and constant.