直接蒸发冷却通风降温系统在兰州地铁的应用分析

Analysis on application of direct evaporative cooling technology into subway ventilation cooling system in Lanzhou

对兰州地铁提出假设模型,针对兰州地区地铁对室内温湿度的要求,分别计算送风状态点、直接蒸发冷却效率、风量等。利用兰州地区的逐时气象参数,计算开启直接蒸发冷却系统的时间及其在夏季空调系统运行时间的占比,并对采用直接蒸发冷却系统和传统机械制冷闭式空调系统2种方案的能耗与经济性进行对比分析。结果表明,兰州地铁非常适合采用直接蒸发冷却通风降温系统,其开启时间占夏季空调运行总时间的41%,运行能耗约为机械制冷的1/2。

The presumptive model is proposed based on the requirements to room tempera ture and humidity of the subway system in Lanzhou. Supply air condition,direct evaporative cool- ing efficiency, supply air volume and so on, are calulated. By utilizing hourly meteorological pa- rameters in Lanzhou area,the operating time of direct evaporative cooling system and its propor- tion of operating time in summer are calculated and analyzed. Its energy consumption and eco- nomical efficiency are compared with traditional mechanical refrigeration closed air-conditioning system. The results show that the ventilation cooling system of direct evaporative cooling fits the Lanzhou subway very well. The system＇ s operating time proportion in summer is 41 % and its operating energy consumption can save 50 %.