In contemporary architecture, the use of wind-catchers is neglected because of the relatively small amount of air provided by this system in traditional architecture and the emergence of modern ventilators and cooling equipment, which have impressed the people. Due to the belief of the importance and impact of natural ventilation on human health, the author has studied for more than 25 years all problems that have led architects to neglect the use of wind-catchers in their designs. On the bases of this study, new types and relatively large wind-catchers, with at least 2m2 in section, are proposed and applied in his designs. They have been accepted and appreciated aesthetically by owners of houses and succeeded in reducing air and houses inner walls temperatures during spring, autumn and summer nights. The wind catchers, however, prove to be incapable during summer day to provide inhabitants with suitable thermal comfort, since they just carry external hot air without any treatments. Thus, the authors thought of adopting the phenomenon of controlled evaporation as a way to lower the air temperature in order to achieve the possibility of making the wind-catcher a cooling radiator and transport cool air. The validity of this idea was tested by constructing a wind-catcher of 2.5∗1.8 m2 in cross section for a one-story guest house building of 60 m2. The wind-catcher walls were lined with regular capillary porcelain material (brick burned at temperatures 750-1150°C) and connected with water drop system that was placed on the upper wind-catcher nozzle. Wooden air guides were designed and placed on the wind-catcher upper nozzle to increase contact between the external hot air and the cooled lining porcelain walls. The results during the summer of 2014 showed that the process of moisturizing wind-catcher lowered air temperature about 17 degree Celsius in the day of outside temperature of 48.7 degrees.
