Abstract
Temperature, humidity, air flow rate, surface temperature of wall are important factors that influence workers' comfortable air-conditions and work efficiency. Thus, it is necessary to keep these factors as optimal values. In this study, we focused on ultrasonic atomization to control relative air humidity. Water particles generated by the ultrasonic atomization are very fine. The ultrasonic atomization was applied for an evaporative cooling process to reduce the value of the relative air humidity. Furthermore, we are investigating the efficiency of existence of the water particles in a cooling system.