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Theory analysis of performance of two-stage evaporative cooling air conditioner are presented. When the two-stage evaporative cooling air conditioner's material and configuration are decided, the main factors affecting the performance of the direct evaporative cooling air conditioner are: relative humidity, dry-bulb temperature of inlet air, face velocity of the filler, spray density of water. Its mathematics model is built to simulate working process. In order to investigate the performance of this new kind of air conditioner, effects influenced the performance of the filler are fully discussed. Data corresponding to different weather conditions are given at the same time. The composite fiber filler which we use has big specific surface area and resistance. The effect of cooling and humidifying is better. When the outdoor temperature is above 25°C, relative humidityφ is less than 50%, the drop of temperature can reach more than 6.3°C. The cooling efficiency is around 80%. The direct evaporative cooling air conditioner not only has good effect in hot and dry area but also can improve the air quality by replacing the traditional air conditioning. It can also save the preliminary investment and working expense. The cost saving of preliminary investment is 40% and the working expense is 70%. And it uses water as the refrigerant to replace the Freon, so this air conditioner can be called green air conditioner because it won't pollute the environment. This can be widely applied in the factories, restaurants, show business, gymnasium and other business situations. From the data measured, when the relative humidity exceeds 80%, the drop of temperature is less than 3.6°C, so it is not applicable in the south of China with large humidity in summer.
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