• Title/Summary/Keyword: CONTAMW

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Case Study of Analysis of Problems and Minimizing Methods of Stack Effect in the Tall Complex Building (초고층 복합건물의 연돌현상 가중요인과 저감방안 사례연구)

  • Yu, Jung-Yeon;Cho, Dong-Woo;Yu, Ki-Hyung;Jeong, Cha-Su;Kang, So-Yeon;Song, Kyoo-Dong
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.363-368
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    • 2006
  • The purpose of this case study is to analyze stack effect problems and to develop methods minimizing methods of stack effect in the tall complex building in cold climates. The main problems in the tall complex building occur in high-rise elevators. Such problems as elevator doors that do not close and exhaust airflows result in excessive pressure differences across elevator doors due to stack effect. Under the expected conditions causing these pressure differences, computer simulations with CONTAMW computer program and field measurements are performed in the tall complex building. The results are analyzed in architectural design aspects. With these analysis, the tall complex building design guidelines to minimize stack effect are proposed.

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A Sutdy on the Pressure Distribution Characteristic of High-rise Buildings in Fire Using Computer Simulation (시뮬레이션을 이용한 화재 시 고층건축물의 압력분포 특성에 관한 연구)

  • Kim, Hye-Won;Lee, Byeong-Heun;Jin, Seung-Hyeon;Kwon, Young Jin
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.05a
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    • pp.49-50
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    • 2019
  • In the case of High-rise buildings, it has a problem by stack effect that rise of vertical height. Especially in case of fire, it need to the consideration of stack effect that it has bigger than general. Therefore in this study, we used to the Contamw and FDS simulation for analysis of stack effect and pressure distribution characteristic in fire. As a result the Contamw simulation shows the pressure distribution by stack effect in general high-rise buildings. However, in case of fire, the height of the neutral plane is lowered and stack effect is larger. Therefore, it is necessary to multiply analyze the temperature distribution and the stack effect in fire.

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The Influence of Natural Smoke Ventilators and Wind Velocities on the Stack effect in High-rise Buildings (배연창 및 외기풍속이 초고층 건축물의 연돌효과에 미치는 영향)

  • Lim, Chae-Hyun;Kim, Bum-Gyu;Yeo, Yong-Ju;Park, Yong-Hwan
    • Fire Science and Engineering
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    • v.22 no.4
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    • pp.20-26
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    • 2008
  • The performance of natural smoke ventilators in High-rise buildings was analyzed by investigating the stack effect depending on the wind velocities using CONTAMW tool. The results showed that the opening of smoke ventilators can influence on the stack effect in the building thus moving the position of the neutral plane toward the opened smoke ventilators. The outside wind velocities can move up the neutral plane toward the top of the building thus increasing pressure differentials at the bottom of the building. The smoke ventilators can maintain its normal performance without outside wind, however, strong outside wind can prevent natural smoke exhaust due to the infiltration of outside air at the ventilators.

The Performance Evaluation of Natural Smoke Ventilators Due to Stack Effect and Wind Velocities in High-rise Buildings (고층건물에서 연돌효과 및 외기풍속에 따른 배연창의 배연성능 평가)

  • Lim, Chae-Hyun;Kim, Bum-Gyu;Park, Yong-Hwan
    • Fire Science and Engineering
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    • v.23 no.6
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    • pp.82-90
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    • 2009
  • Natural smoke ventilator is one of domestic prescriptive methods to be used to exhaust smoke in case of fire in a high-rise buildings. The goal of this study is to evaluate the stack effect and the smoke exhaust performance in high-rise buildings with the opening of natural smoke ventilators using computer modeling technology, thus to estimate its effectiveness as a tool of smoke exhaust. For this purpose, the pressure differential in a domestic high-rise building with natural smoke ventilators was experimentally measured to analyze the stack effect with the closure or the opening of natural smoke ventilators and to calculate compensated air leakage of the building. Computer modeling based on experimentally measured data was carried out to estimate effectiveness of natural smoke ventilators in high-rise buildings using CONTAMW network program.

Mass Flow Rates and Performance of Natural Smoke Ventilators in High-rise Buildings (초고층건물에서 배연창의 풍량해석 및 배연성능)

  • Lim, Chae-Hyun;Kim, Bum-Gyu;Park, Yong-Hwan
    • Fire Science and Engineering
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    • v.23 no.6
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    • pp.91-97
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    • 2009
  • The mass flow rates and performance of natural smoke ventilators in high-rise buildings with 40, 80, 120 stories were evaluated using CONTAMW tool. The results showed that only limited part of smoke ventilators can have positive exhaust flow in high-rise buildings due to stack effect and wind velocities. In the higher story buildings larger stack effect can overcome outside strong wind effect to give more ventilation performance. The air tightness of the building have strong effect on the exhaust performance of the ventilators to give lower performance with loose air tightness of the exterior walls.

The Influence on the Stack effect that Pressure differential system to smoke control in High-rise buildings (초고층 건축물에서 급기가압제연이 연돌효과에 미치는 영향)

  • Lim, Chae-Hyun;Park, Yong-Hwan
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2008.11a
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    • pp.235-238
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    • 2008
  • High-rise buildings with stack effect caused by the foreclosure, which significantly delayed the spread of a fire in effects of these stack effect driving force said. In this research on the stack effect of the lobby if the pressurization of the stairwell analysis of the pressure distribution of the CONTAMW. Overall, the pressurization of the lobby makes it stairwell amount of pressure(+) to the zone in pressure designed to prevent the spread of smoke control performance and found that, the way a normal state and sub-pressurization in the stairwell with stack effect of the turbulence Such as the formation of the upper flow, but, in the upper atmosphere with pressurization was formed by the underlying trend.

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The Study on the Solution of Stack effect in the Vertical shaft of High-rise Buildings (고층건축물 수직 샤프트 연돌효과 해소방법에 대한 연구)

  • Kim, Jin-Soo;Chang, Hee-Chul
    • 한국방재학회:학술대회논문집
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    • 2007.02a
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    • pp.242-245
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    • 2007
  • Stack effects occurred in the stairwell, an important evacuation means of the high-rise building, give a big impact on stairwell pressure difference distribution and it could obstruct evacuation from the building, so should be controlled within proper range. Computer simulation was conducted with CONTAMW2.4 to find the solution of stack effects of the high-rise building. It was able to solve the imbalance pressure difference with a pressurization and a depressurization supplied by fans on higher and lower parts of the stairwell.

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The Influence on the Stack Effect with the Opening of Smoke Ventilators in High-rise Buildings (초고층 건축물에서 배연창 개방이 연돌효과에 미치는 영향)

  • Lim, Chae-Hyun;Kim, Bum-Gyue;Yeo, Yong-Ju;Park, Yong-Hwan
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2008.04a
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    • pp.209-213
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    • 2008
  • The effects on the performance of natural smoke exhaust ventilators installed in high-rise buildings were analyzed depending on the wind velocities and smoke temperatures using CONTAMW tool. The results showed that the smoke exhaust ventilators can maintain given performances in such conditions as low smoke temperatures and low wind velocities. However, high smoke temperatures and high wind velocities can prevent the smoke ventilators to exhaust smokes from the fire room. Significant changes in stack effects in high-rise buildings can also occur with the opening of smoke ventilators in the fire floor.

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Calibration in Hybrid Ventilation Simulation: yes or no? (하이브리드 환기 시뮬레이션 모델의 보정: yes or no?)

  • Kim, Young-Jin;Park, Cheol-Soo
    • 한국태양에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.130-135
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    • 2009
  • This study investigates the need of calibrating a nodal network ventilation simulation model (CONTAMW 2.4). For this purpose, the series of ventilation experiments were conducted and then compared to simulation outputs from an uncalibrated simulation model, resulting in a significant difference between two. Hence, an optimization routine was employed to estimate unknown parameters in the simulation model. In the paper, the authors presents 1.3 unknown parameters with the validated simulation model. It was found that the model with estimated unknown parameters predicts the ventilation phenomena accurately.

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A study on application of an E/V shaft cooling system to reduce the stack effect in high-rise building (연돌효과 저감을 위한 E/V샤프트 냉각장치의 적용에 대한 연구)

  • Lim, Hyun-Woo;Lee, June-Ho;Seo, Jung-Min;Lee, Jung-Hun;Song, Doo-Sam
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.284-292
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    • 2009
  • The stack-effect in high-rise buildings in winter causes many problems such as difficulties in opening or closing doors, infiltration, energy loss, noise and fire protection. Stack effect is influenced by temperature difference between the interior and exterior of building and the height of building. As an attenuation method for stack effect, the architectural methods are generally used. However, as though architectural methods were fully adopted, the problems are reported as ever in tall building. In this study, a new method to reduce stack effect will be suggested. As an active control method against the stack effect, E/V shaft natural cooling method is suggested. In this paper, the concept of E/V shaft natural cooling system and its reduction performance of stack effect by simulation and field measurement will be reported.

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