摘要
地铁站作为应用很广泛的公共空间,乘客在换乘空间内的舒适性体验受到关注。因此,基于低温送风系统的节能性,利用CFD软件研究某地铁站站厅低温送风方式与常规送风方式对CO_(2)浓度分布的影响。对比分析两种送风工况下,竖直方向上(X=15m)和水平方向上(Z=1.5m)的温度场、速度场、湿度场以及CO_(2)浓度场的分布特征。得出以下结论:(1)低温送风方式下,站厅人体活动区域温度温更低,有利于提高人体的热舒适性;(2)两种送风方式下的空气流速分布较为相似,空调工作区的送风速度基本稳定在0.1m/s~0.3m/s;(3)低温送风工况下的室内空气相对湿度普遍都要低于常规送风工况,表明低温送风方式的除湿能力更强,在两者都满足设计要求的情况下,低温送风方式有利于提高人体的热舒适度;(4)两种送风工况下站厅CO_(2)浓度场分布相似且都符合设计标准。低温送风工况下,竖直高度CO_(2)浓度稳定在0.57%,水平方向稳定在0.67%;常规送风工况下,竖直高度CO_(2)浓度稳定在0.6%,水平方向稳定在0.7%。相较而言,低温送风方式下站厅室内CO_(2)浓度更低,能够获得较高的室内空气品质,这是因为低温送风系统的总送风量较低,单位时间内产生的CO_(2)浓度更低。综上所述,低温送风系统在满足温度、空气流速和湿度的要求下,还能够有效降低CO_(2)浓度,改善地铁站内空气品质,为低温送风技术应用到地铁站的可行性提供技术参考。
As a very widely used public space in subway stations,the comfort experience of passengers in the interchange space was of concern.Therefore,based on the energy saving of low-temperature air supply system,this paper used CFD software to study the effect of low-temperature air supply method and conventional air supply method on CO_(2) concentration distribution in a subway station lobby.The distribution characteristics of temperature field,velocity field,humidity field and CO_(2) concentration field in vertical direction(X=15m)and horizontal direction(Z=1.5m)were compared and analyzed under the two air supply conditions.The following conclusions are drawn:(1)the temperature of the human activity area in the station hall is lower under the low-temperature air supply mode,which is conducive to improving the thermal comfort of the human body;(2)the air velocity distribution under the two air supply modes is relatively similar,and the air supply velocity in the air conditioning work area is basically stable at 0.1 m/s to 0.3 m/s;(3)The relative humidity of indoor air under low-temperature air supply condition is generally lower than that of conventional air supply condition,indicating that the dehumidification ability of low-temperature air supply mode is stronger,and if both meet the design requirements,the low-temperature air supply mode is conducive to improving the thermal comfort of human body;(4)the distribution of CO_(2) concentration field in the station hall under both air supply conditions is similar and both meet the design standards.Under the low-temperature air supply condition,the CO_(2) concentration is stable at 0.57%in the vertical height and 0.67%in the horizontal direction;under the conventional air supply condition,the CO_(2) concentration is stable at 0.6%in the vertical height and 0.7%in the horizontal direction.In comparison,the CO_(2) concentration in the station hall is lower in the low-temperature air supply method,and higher indoor air quality can be obtained because the total air supply volume of the low-temperature air supply system is lower,and the CO_(2) concentration generated per unit time is lower.In summary,the low-temperature air supply system can effectively reduce the CO_(2) concentration and improve the air quality in the subway station while meeting the requirements of temperature,air flow rate and humidity,which provides a technical reference for the feasibility of applying low-temperature air supply technology to the subway station.
作者
楼燕进
Lou Yanjin(Ningbo Urban Construction Design&Research Institute Co.,Ltd,Ningbo,315000)
出处
《制冷与空调（四川）》
2022年第4期564-569,共6页
Refrigeration and Air Conditioning
关键词
地铁站厅
低温送风
温湿度场
速度场
CO_(2)浓度场
subway station Hall
low-temperature air supply
temperature and humidity field
velocity field
CO2 concentration field
