轨道交通车辆车厢内二氧化碳的体积分数计算研究

Calculation of Carbon Dioxide Volume Fraction in the Carriage of Rail Transit Vehicle

“新冠肺炎”疫情期间,轨道交通车辆空调系统大多采用全新风运行方式。在密闭的车厢中,二氧化碳的体积分数与车辆空调系统通风方式、乘客人数有较强的相关性,其计算已成为轨道交通车辆空调系统通风设计最为重要的考查指标之一。以上海某轨道交通车辆空调系统及车厢内的气流组织形式为研究对象,采用稳态计算及非稳态计算方法,对正常通风及防疫通风两种工况下车厢内二氧化碳的体积分数进行对比计算,探究轨道交通车辆空调系统在防疫要求下安全的通风方式,为轨道交通车辆车厢内二氧化碳的体积分数计算方法的选择提供参考。

Since the outbreak of COVID-19,most of the rail transit vehicle air conditioning systems began to adopt fresh air operation mode.In a closed railway carriage,the volume fraction of carbon dioxide has a strong correlation with the ventilation mode of vehicle air conditioning system and the number of passengers,therefore the calculation of which becomes the most important safety examination index in the ventilation design for tramcar air conditioning system.In this paper,the air conditioning system and the air distribution form in the carriage of a rail transit vehicle in Shanghai are taken as the research object,two calculation methods of steady state and unsteady state are used to carry out a comparative calculation of carbon dioxide concentration,in order to explore the safe ventilation mode of rail transit vehicle air conditioning system under the requirements of epidemic prevention,and provide theoretical reference for the selection of calculation methods of carbon dioxide volume fraction in rail transit vehicle compartment at the same time.