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首页> 外文期刊>Transportation Research. D, Transport and Environment >Assessment of alternative ventilation schemes at public transport interchange
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Assessment of alternative ventilation schemes at public transport interchange

机译：评估公共交通交汇处的替代通风方案

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摘要

The provision of mechanical ventilation in a semi-confined public transport interchange is mandatory in Hong Kong. The authority recommends the general use of low-level-supply and high-level-exhaust airflow schemes that different from the traditional ventilation concept in that low-level emitted vehicle pollutants are best removed at source. Analyses of air quality at typical public transport interchange environments are conducted for the two airflow schemes. The CFD simulations are generalized by studying light and heavy traffic conditions with adjusted ventilation rates to match the change in vehicle emission levels to examine pollutant concentrations at passenger waiting areas and the elevated footbridges. While the conventional high-level-supply and low-level-exhaust scheme could perform better during light traffic loads, the difference diminishes with increased traffic loads during peak hours. On the other hand, the high-level exhaust scheme has an advantage of serving as a smoke extraction system during a fire outbreak.
机译：在香港，必须在半封闭式公共交通交汇处提供机械通风。当局建议一般使用低水平供应和高水平排气气流方案，这与传统的通风概念不同，因为从源头上最好去除低水平排放的车辆污染物。针对两种气流方案进行了典型的公共交通换乘环境下的空气质量分析。通过研究轻量级和重度交通条件并调整通风速率，以适应车辆排放水平的变化，以检查乘客等候区和高架行人天桥上的污染物浓度，来进行CFD模拟。尽管常规的高水平供气和低水平排污方案在轻载时可以表现更好，但随着高峰时段交通量的增加，差异会减小。另一方面，高级排气方案具有在火灾发生时用作排烟系统的优点。

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