Study on the Running Mode of Evaporative-Cooling-Assisted Air-conditioning in Mid-humidity Region
This paper analyzed the different running modes of evaporative-cooling-assisted air-conditioning, namely the pre-cooling + mixing mode and the mixing + pre-cooling mode in mid-humidity region in summer. Using an engineering example, the advantage and disadvantage of the two running modes are compared via airflow, heat and moisture balance and energy consumption analysis. This paper also analyzes the running modes in transitional season and winter. It is found that the load of mechanical refrigeration air-conditioning can be reduced by using evaporativecooling-assisted fir-conditioning in summer. The running modes of evaporative-coolingassisted air-conditioning system were used in mixing + pre-cooling mode and pre-cooling + mixing mode in Xian, Shaanxi Province. The cooling capacity contributed by evaporative cooling of pre-cooling + mixing mode is 136.2 kW, and that of mixing + pre-cooling mode is 272.4 kW, and the cooling capacity by mechanical refrigeration of two modes is 252 kW. In pre-cooling + mixing mode, the load of fresh air can decrease by 115.8 kW. The pre-cooling + mixing mode is better than mixing + pre--cooling mode. It is also shown that 100％ fresh air should be adopted during the transitional season to utilize the free cooling. In winter, exhausted air should be used for preheating fresh air for saving system energy. This paper provides theoretical analysis and practice experience for the optimization of the annual running modes of evaporative-cooling-assisted air-conditioning in midhumidity region.
Indirect evaporative cooling Mechanical refrigeration Pre-cooling Running mode
Xiang Huang Chao Wang Fang-cheng Xu Zheng-hua Yan Zhixiang Wu
School of Environmental &Chemical Engineering,Xian Polytechnic University,Xian,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
298-304
2009-11-06（万方平台首次上网日期，不代表论文的发表时间）