공기질 개선장치 가동에 따른 도시철도 차량 내 미세먼지 농도 변화에 대한 수치해석 연구

초록

Although cabin air purifiers have been installed to reduce particle matter (PM) in subway cabins, the properties of PM concentration depending on the working conditions have rarely been studied. Thus, to predict the degree of purification efficiency, properties of airflow and changes of particle concentration were analyzed using numerical analysis while operating air purifiers and HVAC units. In the case of fluxing PM concentration of 100 μg/m 3 achieved by operation of HVAC (3,180 m 3 /h) and exhaust fans (990 m 3 /h), the purification rate was found to slow down over time even when air purifiers were operated. If there were 60 standing passengers in addition to 48 seated passengers under fluxing high PM concentration, the air circulation was interrupted in the lower part of cabin, resulting in stagnation of PM reduction. Therefore, when polluted air flows into a crowded cabin, the reduction of air circulation time and PM penetration from tunnels can be viable strategies for facile purification in crowded cabins.

키워드