天津西站地下出租车蓄车区通风系统模拟分析

Simulation on Ventilation System for Underground Taxi Waiting Zone in Tianjin West Railway Station

本文以天津西站交通枢纽的地下出租车蓄车区为研究对象,建立了通风系统的数学模型,并用Airpak软件对其在不同换气次数工况下的污染物及温度分布进行了模拟分析。模拟结果表明:综合考虑空气品质、舒适性以及节能运行,得到最佳换气次数为10次/h;排风口位置对空气中污染物浓度没有显著影响,受热气流影响,将排风口设置在车辆集中区域上方的排风效果更好;由于污染源种类比较单一且空气流速较大,CO和CO2的浓度分布相似。本文结论对天津西站地下出租车蓄车区通风系统设计具有一定指导意义,也可为同类型建筑的通风系统设计提供参考。

In this paper, a series of computational fluid dynamics （CFD） models were established to simulate the ventilation system of underground taxi waiting zone in Tianjin west railway station. Also steady state computational models were utilized to investigate and predict the thermal comfort and air quality under different air change rates. The results indicated that the minimum air change rate was 10 times per hour when the air quality, thermal comfort and energy-saving were comprehensively considered. Furthermore, the location of exhausts had no significant influences on air pollutant concentration. The ventilation effects were relatively better when the exhausts were located above the vehicle concentrated area. In addition, because of the limited categories of pollutant source and high speed of air flow, the concentration distributions of carbon dioxide and carbon monoxide were similar. The conclusions of this study could guide the design of ventilation system in Tianjin west railway station and other similar buildings.