The model output of two cases as follow: Evaporative cooling works well to reduce the inside greenhouse temperature in regions with a low outside humidity. As this is the case in the central part of Saudi Arabia, many greenhouses rely on pad and fan system for cooling. However, the water consumption associated is high and as water is scarce, all effort should be made to ensure efficiency of the pad wall during the growing season. In connection, to get an efficient pad wall cooling, it is important to have an equal distribution of water and to prevent dry spots.
