Evaporative cooling process adaptive for Baghdad city climate

Human has developed a board rang of passive cooling techniques in various parts of the world up to a very impressive level of maturity: cliff dwellings through the world (ground cooling), wind towers (convective and mass cooling), sprinkling water with fountains (eva-porative cooling), and whitewash (sun protection). All these cooling techniques were based on careful design in which heat and mass transfer principles did not make use of any mechanical energy: they were totally passive. The concept of evaporative cooling is that when water evaporates it absorbs a large quantity of heat from its surroundings. Evaporation occurs at whatever time the vapor pressure of water is lesser that the water vapor in the surrounding atmosphere. The phase change of