Mathematical Modelling of Two-stage Evaporative Cooling System with A New Kind of Directive Water Evaporative Cooling Air Conditioner
Theory analysis of performance of two-stage evaporative cooling air conditioner are presented. When the two-stage evaporative cooling air conditioners 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℃. 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 wont 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℃, so it is not applicable in the south of China with large humidity in summer.
Indirect water evaporative cooling Two-stage evaporative cooling system Directive evaporative cooling Theory analysis Numerical simulation
Zhongbao Liu Shuang Yang Qingbo Ma Qiang Zhang Liu Ting
School of Environmental and Energy Engineering,Beijing University of Technology,Beijing,China Household Appliance Intelligent & Energy Saving Technology Research Center,China
国际会议
The 6th International Symposium on Heating,Ventilating and Air Conditioning(第六届国际暖通空调学术会议)
南京
英文
533-540
2009-11-06（万方平台首次上网日期，不代表论文的发表时间）