The water flows down the corrugated surface of the evaporative cooling pad. Part of the water is evaporated by the warm and dry air that passes through the pad.
The rest of the water assists in washing the pad, and is drained back to the pump station through a watergutter system.
The heat that is needed for the evaporation is taken from the air itself. The air that leaves the pad is therefore cooled and humidified simultaneously without any external energy supply for the evaporation process.
An entirely natural cooling process is nature‘s own cooling process.