• Proceedings of the KSEEG Conference
• /
• 1999.04a
• /
• pp.236-239
• /
• 1999

• Land and Housing Review
• /
• v.6 no.4
• /
• pp.215-220
• /
• 2015

The purpose of this study was to comparative analyses of energy performance in apartment houses adopted window frame-type natural ventilation, under-floor air distribution ventilation and heat recovery ventilation. As the object of energy simulation, the three type ventilation system with area of $84m^2$ was selected in apartment house. As a result, when the ECO2 simulation was performed, the 1st requirement quantity per annual were $159.9kWh/m^2yr$(CASE1, Natural Ventilation), $179.7kWh/m^2yr$(CASE2, Under-floor Air Distribution Ventilation) and $161.0kWh/m^2yr$(CASE3, Heat Recovery Ventilation).

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2013.10a
• /
• pp.24-26
• /
• 2013

이 연구에서는 선박의 환기구가 화재 발생시 선박승무원의 인명안전에 미치는 영향에 대하여 분석하고자 한다. 분석 기법은 CFD을 이용한 화재시뮬레이션이다. 향후 이 분석 결과를 이용하여 선박승무원의 생존율 향상에 필요한 여러 가지 조건 중 하나로 사용될 수 있을 것으로 본다.

• Fire Science and Engineering
• /
• v.30 no.1
• /
• pp.12-16
• /
• 2016

Propane fires of 1000 to 3000 kW in the ISO 9705 fire room were simulated using FDS to study the problem of decreasing temperature with increasing fire size. A criterion is proposed for under-ventilated fires. The computed temperature at 2000 kW and above was lower than that at 1500 kW. The heat release rate was limited by a lack of oxygen in the simulation. It was found that the heat release rate can therefore be a criterion for under-ventilated fires in simulations. Fires of 1700 kW and above in the ISO 9705 fire room are predicted to be under-ventilated.

• Tunnel and Underground Space
• /
• v.11 no.4
• /
• pp.319-327
• /
• 2001

Introduction of new design tools has been required to optimally design and operate the ventilation system of long vehicle tunnels.. The demand has led to wide spread use of the simulation technique throughout the would to analysis the dynamic relationship among the variables associated with vehicle tunnel ventilation. This paper aims at performing on-site study at local tunnels to test the applicability of NETVEN, a simulation model vehicle tunnel ventilation. The study was carried out at four urban as well as highway tunnels model of vehicle tunnel ventilation. The study was carried out at four urban as well as highway tunnels employing different ventilation systems as well as traffic methods. There were some discrepancies sound between the simulation output and measurements and the following four factors are considered to mainly cause those disagreement. (1) The real situation shows distinctive transient and retarding characteristics with respect to air flow and contaminant dispersion, while ventilation forces are not steady-state and in particular those traffic and climatic variables show significant instantaneous variation. (3) Near the exit portal, the CO levels show bigger differences. The general trend is that data with higher CO concentrations carry bigger discrepancies. Turbulent diffusion is though to be the main reason for it and also contribute to the fact hat the highest CO concentrations are found at the locations somewhat inward, not at the exit portals. (4) Higher traffic rate results in higher discrepancies of ventilation velocity. Along with the exhaust characteristics, the vehicle aerodynamic characteristics need to be studied continuously in order to reduce the velocity disagreement.

• 한국전산유체공학회:학술대회논문집
• /
• 2009.04a
• /
• pp.208-214
• /
• 2009

지하 복수층 주차장은 도시의 밀집화 및 자동차의 급격한 증가로 인한 토지부족 및 주차난을 해소할 수 있는 좋은 방법이다. 하지만 인체유해 배출가스의 집중으로 환기의 중요성이 대두되는 추세에도 불구하고 실제로는 시공이 완료 된 후에나 오염도 측정이 가능하다. 이러한 이유로 CFD 시뮬레이션으로 시공이전의 지하 복수층 주차장의 공기오염도를 예측했다. CFD 시뮬레이션은 예산과 시간을 절감한 공기오염도 예측이 가능하다. 실제의 당산근린공원의 지하주차장을 대상으로 오염도를 예측했다. 급기에만 강제유동을 일으키는 2종과 배기에만 강제유동을 일으키는 3종 기계환기법, 그리고 급배기에 강제유동을 일으키는 1종기계환기법을 각각 적용하여 공기오염도를 계산했다. 지하1층과 지하2층의 입구 및 출구유속을 10, 15m/s로 하여 실내평균연령과 실내평균환기효율을 살펴보았다. 계산결과는 급기와 배기에 강제유동을 동시에 일으키는 1종 기계환기법의 값과 비교하였다.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.5 no.4
• /
• pp.389-400
• /
• 2003

In order to recommend the mechanical smoke exhaust operation mode, Subway Environmental Simulation (SES) is used to predict the airflow of the inlet and outlet tunnel for the subway station. Fire Dynamic Simulation (FDS) is used the SES's velocity boundary conditions to clarity the smoke exhaust effectiveness by the variations with mechnical ventilation system. We compared each 6 types of smoke exhaust systems for the result of smoke density and temperature distributions for 1.5m height from the subway station base in order to clarify the safety evaluation for the heat and smoke exhaust on subway fire.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
• /
• v.3 no.2
• /
• pp.135-148
• /
• 2005

In the stage of conceptual design for the construction and operation of the geologic repository for radioactive wastes, it is important to consider a repository ventilation system which serves the repository working environment, hygiene & safety of the public at large, and will allow safe maintenance like moisture content elimination in repository for the duration of the repositories life, construction/operation/closure, also allowing safe waste transportation and emplacement. This paper describes the possible ventilation system design criteria and requirements for the prospective Korean radioactive waste repositories with emphasis on the underground rock cavity disposal method in the both cases of low & medium-level and high-level wastes. It was found that the most important concept is separate ventilation systems for the construction (development) and waste emplacement (storage) activities. In addition, ventilation network system modeling, natural ventilation, ventilation monitoring systems & real time ventilation simulation, and fire simulation & emergency system in the repository are briefly discussed.

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2006.06a
• /
• pp.62-62
• /
• 2006

• Proceedings of the Korean Society for Agricultural Machinery Conference
• /
• 2002.07a
• /
• pp.249-254
• /
• 2002

온실에서 환기는 외기와의 공기교환을 통한 온도 및 습도의 조절뿐만 아니라 이산화탄소 등의 가스농도를 조절함으로써 온실내 공기의 쾌적성 확보와 실내기류의 형성으로 인한 작물의 생육촉진에도 중요한 역할을 담당한다. 그러므로, 작물생육환경의 최적화를 통한 품질향상 및 수확량 증대를 목적으로 하는 온실재배에 있어서 환기특성 분석 및 공기유동 예측은 가장 기본적인 설계요소라 할 수 있다. (중략)