Real-World Vehicle Emission Rate of Particle Size Distributions Based on Measurement of Tunnel Flow Coefficient

Applied Sciences

Chaehyeong Park¹  Myoungki Song¹  Min-Suk Bae¹  Taehyoung Lee²  Gyutae Park²  Kyunghoon Kim²  Sanguk Lee³  Jongtae Lee³ 

[1] Department of Environmental Engineering, Mokpo National University, Muan 58554, Korea;Department of Environmental Science, Hankuk University of Foreign Studies, 81, Oedae-ro, Mohyun-eup, Yongin 17035, Korea;Transportation Pollution Research Center, National Institute of Environmental Research, 42, Hwangyong-ro, Seogu, Incheon 22689, Korea;

关键词: SMPS;    emission rate;    vehicle emission;    number concentration;   

DOI  :  10.3390/app11020794

来源: DOAJ

【 摘 要 】

This study aims to analyze the seasonal number concentrations corresponding to each particle size derived from the measurements of exhausts from approximately seven million vehicles on real-world using a pair of the scanning mobility particle sizer to determine the vehicle emission rate. The actual tunnel flow coefficient was investigated for car emission rate based on the measurements of individual physical parameters (i.e., cross section area and length of the tunnel, tunnel wind speed and traffic volume). The mode of particle diameter according to temperatures in respective seasons exhibited a high correlation together with rapid changes at temperature above the breakthrough point. The temperature acted as major cause of determination of final condensation diameter, which is also dependent on diverse environmental effects comprising particle number concentration. The traffic volume of ordinary cars increased by more than twice as much in the period of Asian New Year, the traffic volume of buses/RVs/trucks decreased by more than 25% during weekdays. As a result, the particle number concentration discharged from a unit vehicle was 6.96 × 10¹² N/veh·km during weekdays, and the values of weekends appeared as 6.08 × 10¹² N/veh·km. The overall averaged particle number concentration based on the actual seasonal road measurements shows 5.82 × 10¹² N/veh·km.

【 授权许可】

Unknown