Research On Vehicle Emissions In Underground Car Parkings Based On MOVES Model

The setting of the underground garage effectively solves the problem of insufficient parking space on urban ground.But at the same time,due to the closed environment of the underground garage,the accumulation of motor vehicle exhaust will increase the pollution level in the garage,thus endangering human health.Therefore,understanding the pollution emission characteristics of motor vehicles from the pollution source side is necessary for the rational design of the ventilation system in the underground garageThis study has localized the motor vehicle emission model MOVES2014 a and applied it to the underground garage,it is used to simulate the emission factors of CO and particulate matter(PM2.5,PM10)of motor vehicles in the underground garage.The single factor method was used to analyze the influence of each parameter on pollutant emission characteristics.Then calculate the total emissions of different types of pollutants in the underground garage,as well as the amount of theoretical air changes when diluting the pollutant concentration to the specified limits.First,localize the parameters in MOVES2014 a to correct the values.use the model to simulate the low-speed driving emission factor and the starting emission factor of the motor vehicle in the underground garage.Through the analysis of the simulation results,it shows that the environmente,vehicle,fuel,road and other parameters all have a certain degree of impact on vehicle emission factors.Among them,the age parameter and temperature parameter have the greatest influence on emission factors.The calculation of vehicle pollutant emission factors in the underground garage lays a foundation for calculating total pollutant emission in various types of underground garages.Based on the obtained results of the vehicle emission factors,simplify the operation status of motor vehicles in the underground garage.Then calculate the total pollutant emissions in the underground garage of residential area,the underground garage of commercial area,and the taxi parking garage.According to the calculation results,the variation law of CO,PM2.5 and PM10 total emissions and each sub-process emission under different operating conditions in each garage are obtained.The analysis shows that the pollutant emissions in winter working conditions is always higher than that in summer,the pollutant emission of cold-start driving is greater than that of warm-start driving,the pollutant emission of low-speed driving is the smallest,the proportion of pollutant emissions in the garage parking area is much higher than that in the lane area.In addition,calculate the pollutant emissions from the underground traffic tunnel of the Haxi Station.The results show that the pollutant emissions in the transfer area is higher than that of other sections with similar length,the pollutant emissions in the taxi storage area is much higher than other sections.According to the calculated total emissions of pollutants in each underground garage,using the dilution concentration method to calculate the ventilation volume and the amount of theoretical air changes when diluting the pollutant concentration to the specified limits.The results can provide reference for the design of the underground garage ventilation system.And calculate the actual concentration of pollutants in the garage when the recommended number of air changes 6 times per hour was used under the most unfavorable conditions.It is found that the concentration of each pollutant exceeds the standard,and the pollution degree of particulate matter is higher than that of CO,especially PM2.5 with a high exceeding multiple.