Main Article Content
Air conditioning systems are responsible for increasing men's work efficiency as well for his comfort, mainly in the warm periods of the year. Currently, the most used system is the mechanical vapor compression system. Furthermore, the higher electricity demand for cooling causes summer peaks, which may lead to high electricity prices and grid connected problems as black-outs. However, in many cases, evaporative cooling system can be an alternative to replace the conventional system, under several conditions, or as a pre-cooler in the conventional systems. The remaining cooling demand must be covered with alternative, environmentally friendly cooling technologies. This paper presents the basic principles of the evaporative cooling process for human thermal comfort, the principles of operation for the evaporative cooling system and the mathematical development of the equations of thermal exchanges, allowing the determination of the effectiveness of saturation to determinate the convective heat transfer coefficient with the mathematical calculation.