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김정수(Kim jung-su),배광호(Bae khwang-ho),유건종(Yoo gun-jong) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
With increasing concerns of low carbon green growth, effective mass transit system, such as subway, train and bus, draws big interests. Among those public transportations, more than 7.21 million people use the Seoul metropolitan subway network daily. And subway's proportion of trips by mode is expected to be increased to 38.6 percent by 2021. As more people use the subway system, the indoor air quality of the subway has become a key issue. However, there is no established proof or quantitatively verified data for natural ventilation effect of EMU(electric multiple unit). In this study, the quantities of the incoming fresh air, circulating return air and exhausting emission air were measured. The measured data showed that the natural ventilation by EMU had enough ability to keep clean air in the subway train.
권순박(Kwon Soon-Bark),김세영(Kim Se-Young),조영민(Cho Youngmin),박덕신(Park Duck-Shin),배광호(Bae Khwang-Ho),유건종(Yoo Gun-Jong),김정수(Kim Jung-Su) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Air conditioning of subway cabin is achieved by two separate air conditioners installed on the top of the cabin. Cooling air is supplied through the line duct on the ceiling through the whole cabin indoor evenly, and the return air is exhausted to the center area of ceiling. Depending on the indoor air quality, outdoor air is introduced into the cabin. A part of air is pressurized out through the exhaust duct by the positive pressure condition of cabin indoor. However, cabin indoor is not always maintained in a positve pressure by frequent door opening during operation. Therefore, outdoor air can be introduced through exhaust fan and tunnel air, highly polluted by fine particles can cause a indoor air pollution. In this study, we measured air velocity, pressure difference, and particle concentration in order to reveal the inflow of outdoor air. We found that outdoor air was introduced during the subway acceleration by the inertial force of indoor air.