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권순박(Kwon Soon-Bark),조영민(Cho Youngmin),박덕신(Park Duckshin),박은영(Park Eun-Young),김세영(Kim Se-Young),정미영(Jung Mi-Young) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Ubiquitous sensor network (USN) based on ZigBee communication protocol has been used in various application fields, such as home-network, intelligent building and machine, logistics, environmental monitoring, military field, security field and etc. The ZigBee is targeted at radio-frequency application that require a low data rate, long battery life and secure network. Especially, the USN system can be applied efficiently to building-indoor where the complex geometry is adopted. In this study, all 90 points of railway cabin indoor were monitored for temperature and humidity using USN technology. All sensors were pre/post-calibrated and the temperature/humidity change were analyzed in a railway cabin in real-time. The results would be useful to develop the cabin heating, ventilating and air conditing (HVAC) system to meet all passengers" thermal comfort regardless of their seat position.
권순박(Kwon Soon-Bark),박덕신(Park Duckshin),조영민(Cho Youngmin),박성혁(Park Sunghyuk),오세찬(Oh Sehchan),김영남(Kim Youngnam) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
More than 7 million people use the Seoul metropolitan subway network daily. This number tends to increase due to the increase of oil price. Indoor air quality of electrical multiple unit (EMU) is strongly affected by outdoor air quality, however, indoor thermal comfort is subjected to heating, ventilating, and air conditioning (HVAC) system of EMU. In general, air temperature, humidity, air velocity, surface temperature, and illumination are key parameters affecting thermal comfort of passenger. It is known that the well-designed HVAC system should improve the thermal comfort of passengers and should increase the energy efficiency of HVAC system also. In this study, we analyzed the thermal comfort of advanced EMU developed by Korea Railroad Research Institute by using the computational fluid dynamics (CFD) in order to find the optimum HVAC system which can improve thermal comfort of passengers with a minimal energy use.
전동차 출입문 개폐에 따른 객실 이산화탄소 농도변화의 실험적 연구
권순박(Kwon Soon-Bark),박덕신(Park Duckshin),조영민(Cho Youngmin),박은영(Park Eun-Young),김세영(Kim Se-Young),정미영(Jung Mi-Young),함대주(Ham Dae-Joo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Indoor air quality (IAQ) of subway becomes a key issue as the IAQ guidelines for public transportation published. There are two major sources regarding IAQ of subway; One is the sources coming from outdoor air and the other is sources of inside. Particulate matters smaller than 10 micrometer (PM10) and carbon dioxide (CO₂) are recognized as the one of the most severe pollutants in Korea. The source of PM10 is mainly coming from outdoor air, however, the source of CO₂ is coming from passengers exhaust. According to the guidelines, the level of CO₂ should be lower than 2500ppm for normal operating time and lower than 3500ppm for rush hour. In order to satisfy these guidelines, the volume of mechanical ventilation should be increase which consumes extra energy for heating or cooling. Therefore, the optimum volume of mechanical ventilation should be calculated for energy saving. In this study, we measured the natural ventilation rate by door-opening which can reduce the load of mechanical ventilation. The CO₂ generator and sensors were used to measure the change of CO₂ by periodic door-opening of subway.
권순박(Kwon Soon-Bark),조영민(Cho Youngmin),박덕신(Park Duck-Shin),김세영(Kim Se-Young),박재형(Park Jaehyung),조관현(Cho Goan-Hyun),유건종(Yoo Gun-Jong),김정수(Kim Jung-Su) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Management of indoor air quality of underground subway station is an important issue since the limited natural ventilation, limited sunshine incoming, and highly moistured atmosphere. The improvement in IAQ of platform is expected because most stations were installed with platform screen door currently, however, the poor air quality in tunnel might be affecting subway cabin indoor. In this study, we developed the air quality assessment model based on computational fluid dynamics. The geometry of air ventilation unit, seat, LCD monitors, and passengers were modeled using commercial software (Design Modeler) and fluid pattern and pollutants trajectories were analyzed by using CFX. We predicted the thermal comfort by predicted mean vote (PMV), distribution of CO2 and PM10 concentration. It is expected that this model can be used for the performance test of air cleaners which are under development.
칸막이가 설치된 사무실 공간의 냉방효과에 관한 수치해석적 연구
권순박(Soon-Bark Kwon),박덕신(Duck-Shin Park),조영민(Young-Min Cho),박은영(Eun-Young Park) 한국실내환경학회 2006 한국실내환경학회지 Vol.3 No.4
Numerical simulation using computational fluid dynamics (CFD) was performed to calculate the predicted mean vote (PMV) based on velocity and temperature profiles of air in a partitioned office building. The office building (W:14.65 m, D:7.57 m, and H:2.63 m) was divided by partitions of 1.5 m height and shared by 7 office workers. Each person uses a personal computer and printer on a desk. One stand-type air conditioner was installed in the corner of the room and operated at the variable flow rate of 35 ㎥/min. In the case study, we assumed that the initial temperature of the room was 303 K and it was cooled down by operating air-conditioner. The outside temperature was fixed at 303 K and the heat flux through the windows was included in the calculation. Heat sources of personal computers, human bodies, fluorescent lamps, and refrigerator were considered. The temperature and PMV values were also calculated to asses the thermal comfort of each person by operating time of air conditioner. It was found that the thermal comfort could be improved by changing the angle of diffuser grill of air conditioner.
권순박(Soon Bark Kwon),조영민(Youngmin Cho),박덕신(Duck-Shin Park),박은영(Eun Young Park) 한국대기환경학회 2008 한국대기환경학회지 Vol.24 No.2
The guidelines for indoor air quality of public transportations such as subway, train and bus was presented by Korean Ministry of Environment last end of year 2006 based on the great consequence of indoor air quality in daily life. Two main parameters, carbon dioxide (CO₂) and particulate matters smaller than 10 ㎛(PM₁?), were selected as index pollutants for the management of indoor air quality. The former pollutant, CO₂, is regarded as index of ventilation status and the major source of CO₂ in the train or subway is the exhalation of passengers. It is publically perceived that the high CO₂ concentration in a crowded subway will be reduced and ventilated with outdoor air by door-opening taken every 2 or 3 minutes when the train stops each station. However, there has not been any scientific proof and quantitative information on the effect of door-opening on the CO₂ reduction by ventilation with outdoor air. In this study, CO₂ concentration and number of passengers were measured at each station on the 3 lines of Korail metropolitan subway. In order to evaluate the effect of CO₂ reduction by door opening, the theoretical approach using the CO₂ balance equation was performed. By comparing the predicted data with monitoring one, the optimum CO₂ dilution factor was determined. For the first time, it was quantified that about 35% of CO₂ concentration in the subway indoor was removed by the door-opening at each station.
권순박(Soon-Bark Kwon),박덕신(Duck-Shin Park),조영민(Youngmin Cho),박재형(Jae-Hyoung Park),김세영(Se-Young Kim),박은영(Eun-Young Park),김창수(Changsoo Kim),김기연(Ki-Youn Kim) 한국실내환경학회 2011 한국실내환경학회지 Vol.8 No.1
The objective of this study is to assess a level of microbial contamination in the KTX. Investigation sites in the KTX were cabin, gateway, toilet and passenger seat. It was found that the mean concentrations of airborne bacteria and fungi were 157 CFU/㎥ and 84 CFU/㎥ , respectively, in all of the investigation sites of the KTX. They did not exceed the domestic standard (800 CFU/㎥) for airborne bacteria and the guideline (150 CFU/㎥ ) for airborne fungi recommended by WHO. Mean levels of bacteria and fungi distributed in passenger seat were 2.6×105 cfu/㎥ and 3.7×104 cfu/㎥ , respectively. The predominant genera identified in the KTX were Bacillus, Corynebacterium, Staphylococcus and Micrococcus for bacteria and Aspergillus, Cladosporium and Penicillium for fungi, respectively. Based on identification result, the profiles of airborne bacteria and fungi in the KTX was wholly similar to those of bacteria and fungi distributed in the passenger seat.
KTX 객실의 CO₂ 농도와 승객 수 및 터널구간과의 상관관계
권순박(Kwon Soon-bark),조영민(Cho Young-min),박덕신(Park Duck-shin),박은영(Park Eun-young) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
With increasing concerns of indoor air quality, CO₂ concentration in the public transportation, such as train, bus, and subway, draws big interests. The CO₂ concentration in the indoor air is regarded as index of ventilation status rather than that of adverse health effect. In this study, we measured the time-series of CO₂ concentrations in the KTX cabin during the journey of Gyongbu-line (Seoul-Busan) and Honam-line (Seoul-Mokpo) with the number of passengers on board. At the same time, the concentration of particulate matter (PM), temperature, humidity and gaseous pollutants including HCHO and VOCs were monitored. It is found that the CO₂ concentration was correlated linearly with number of passengers and was highly correlated with tunnel regions where the ventilation unit (flap) was closed.
수도권 전동차 객실 CO₂농도관측을 통한 자연환기효과 해석
권순박(Kwon Soon-Bark),조영민(Cho Youngmin),박덕신(Park Duckshin),박은영(Park Eun-Young),김세영(Kim Se-Young),정미영(Jung Mi-Young) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Two major parameters, i.e. carbon dioxide (CO₂) and particulate matters smaller than 10μm (PM10), were selected as the index pollutants in managing indoor air quality. The former pollutant, CO₂, is the index that shows the ventilation status and is exhaled by passengers when they breathe in train or subway. It is generally known that high CO₂ concentration in the vehicle may be decreased by insufficient air-tightening vehicle bodies and the air is ventilated when vehicles stop at the station and doors open. However, there is no established proof or quantitatively identified data on how much the CO₂ concentration is reduced when ventilation is done while doors are opened. In this study, CO₂ concentrations were measured in 6 lines of Korail and one line of Seoul Metro subway linesand a theoretical approach was takento predict the changing trend of CO₂ concentrations during the operation of vehicle by using CO₂ dilution factor through natural ventilation. As a result, the change could be quantified and it was found that app. 35% of indoor CO₂ was removed through natural ventilation.