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지하역사 승강장 및 대합실 평상시/비상시 급ㆍ배기 환기 Large Eddy Simulation
장용준(Yong-Jun Jang),류지민(Ji-Min Ryu),박덕신(Duck-Shin Park) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.3
The turbulent flow behavior of air supply and exhaustion in the Shin-gum-ho subway station is analyzed for ordinary and emergency state. The depth of Shin-gum-ho station is 43.6m which consists of the island-type platform(8th floor in underground) and a two-story lobby (first & second floor in underground). An emergency stairway connects between the platform and the lobby. Ventilation operation mode for ordinary state is set up as a combination of air supply and exhaustion in the lobby and platform, while for emergency state it is set up as a full air supply in the lobby and a full exhaustion in the platform. The entire station is covered for simulation. The ventilation diffusers are modeled as 95 square shapes of 0.6m?0.6m in the lobby and as 222 square shapes of 0.6m×0.6m and 4 rectangular shapes of 1.2m×0.8m in the platform. The total of 7.5million grids are generated and whole domain is divided to 22 blocks for MPI efficiency of calculation. Large eddy simulation(LES) is applied to solve the momentum equation and Smagorinsky model(C<SUB>s</SUB>=0.2) is used as SGS subgrid scale) model. The time-averaged velocity fields are compared to experimental data and show a good agreement with it.
박덕신(Park Duck-Shin),조영민(Cho Young-Min),권순박(Kwon Soon-Bark),박은영(Park Eun-Young) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Because the indoor spaces of the passenger cabin is generally airtight to secure the safety of passengers and enhance the efficiency of the cabin air conditioning performances, the contamination pattern of them are largely similar to that of general indoor spaces. Therefore, continuous supply of outdoor air is required to keep the amenity of indoor space. Heating, ventilation, and air-conditioning (HVAC) system is composed of air cleaning filter, heater and air conditioned, blower and ducts. To achieve the clean indoor environment, an integrated control of each HVAC equipment are required. In this study, we developed the air cleaning system to enhance the amenity of the railroad passenger cabin.
박덕신(Duck-Shin Park),이주열(Ju-Yeol Lee),정우성(Woo-Sung Jung) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Ventilation system on passenger rooms should be designed for the health and comfort of the passengers. One of the main aim is to create an acceptable thermal environment without draught problems. The draught sensation increases when the air temperature decreases and the air velocity increases. Airflow in passenger rooms is turbulent. Lateral temperature and humidity gradients in the electric rolling stock have been studied. And, the difference in the mean temperatures measured at 0.7, 0.9, 1.2, 1.7 m above the floor. It has been found that temperature with large fluctuations caused more draught complains.
박덕신(Duck-Shin Park),정우성(Woo-Sung Jung),정병철(Byung-Chul Jung) 한국철도학회 2000 철도저널 Vol.3 No.2
Modern people stay at indoor places about 90% of a day. Radon-222 is a gas produced by the radioactive decay of the element radium. And, radon is one of the major indoor air pollutants. Radon moves into the underground space through various routes and is considered to cause lung cancer by hurting the lung tissues. In this study, we measured the subway radon level at 9 stations of 3 lines. According to test results, we can figure out the concentration of radon by lines, times, and measuring points. So, it was found that ventilation conditions are the most important factors in the subway air quality. Finally, we suggested effective and economic management methods of air pollution in the subway.
무선 센서네트워크를 이용한 역사에서의 대기오염 모니터링
박덕신(Park Duck-Shin),조영민(Cho Young-Min),권순박(Kwon Soon-Bark),박은영(Park Eun-Young) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
It was intended in this study to seek for the measures to utilize the USN technique, which has high usability due to low price and low power consumption, in air quality monitoring. As a method, the sensors of temperature, humidity, particulate matters (PM10), and carbon dioxide (CO₂) were installed in the self-manufactured sensor nodes; the nodes were installed in the waiting rooms and platforms of a subway station and the measurements were collected at real time with use of a computer which micro gateway was built in. Collected data was to be processed by the statistics program installed in the computer; the collected data is to be used in managing the air quality of stations after transmission to the ventilation system of ventilation chambers.
박덕신(Duck-Shin Park),정우성(Woo-Sung Jung),정병철(Byung-Chul Jung),김동술(Dong-Sool Kim) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
As the air pollution caused by diesel vehicles goes worse, so non-road vehicles exhaust gas standards are more strict in an foreign countries. There is growing evidence that diesel vehicles could play the important role in determining health effects. Most of the particle number emitted by diesel engines is in the nanopaticle range, D<SUB>p</SUB> < 50㎚, while most of the mass is in the accumulation mode, 50㎚ < D<SUB>p</SUB> < 1000㎚ range. The aim of this work was to investigate pollutants in the exhaust of railroad diesel rolling stock under load tests.
Hybrid Pilot System을 이용한 철도 오염토양 복원
박덕신(Duck-Shin Park) 한국철도학회 2000 철도저널 Vol.3 No.3
In this study, we tested hybrid pilot system combined with soil vapor extraction and bioventing methods on the contaminated railroad soil. So, we found out the remediability and operating conditions. Air permeability(k) and gas phase(O2/CO2/VOCS) level trend are very important to determine the remediation rate of the contaminated sites. Throughout hybrid pilot test on different conditions, the range of air permeability(k) was 1985~1194 darcy. The tests results in hybrid system was appropriate on this test sites, and the suitable injection air flow rate was 3.5㎥/hr. So, we suggested a basic data for the remediation and management of contaminated railroad soil.
박덕신(Park Duck-Shin),조영민(Cho Young-min) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
The aim of this study is to investigate the emission characteristics of volatile organic compounds from the interior materials of railroad rolling stock. Samples for VOCs were collected using a environmental chamber and the samples were analyzed for 35 individual compounds. 6 different types of materials, seat cover and floor material of Mugunghwaho, Saemaeulho and electric rolling stock were analysed. The results were expressed as concentrations over 12, 18, 24, 36 and 48 hours. VOCs concentrations were measured to be higher in the 12 hours than in the 48 hours. Floor material of Mugunghwaho showed the highest concentration of all studied materials. Followed by floor materials of Saemaeulho and electric rolling stock.