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HVAC 내외기율과 인체호흡이 자동차 IAQ에 미치는 영향에 대한 연구
서진원(J.W. Seo),최윤호(Y.H. Choi) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Recently, there has been growing public concern over IAQ(lndoor Air Quality) of automotive cabin. Because air inside an automotive cabin is exposed to various pollution substances, it could be a serious threat to passengers health and safety. While there are many suggestions to improve IAQ, we analyzed factors including CO<SUB>2</SUB> exhalation from human model and various operating characteristics of HVAC system(flow rate, fresh air to recirculated air) to understand the effects on the IAQ. Also, for the active control of automotive IAQ, we proposed a optimal HVAC operating condition and locations of CO<SUB>2</SUB> sensors.
원통형 열가수분해 반응기의 최적설계를 위한 수치해석적 연구
박경석(K.S. Park),서진원(J.W. Seo),최윤호(Y.H. Choi),김호(H. Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Recently, THP(Thermal Hydrolysis Process) which enables high energy conversion efficiency and secures the economic efficiency is recognized as an effective method for recycling organic waste. Sewage sludge, having the highest portion of organic waste that can be recycled by using THP, is known to have effective THP at 200 V. In this paper, mixing characteristics of sewage sludge are investigated for several parameters(blade shape, rotating velocity, aspect ratio) associated with reactor in order to satisfy a target temperature of 200℃ for effective THP reaction. With this result, we developed a function relating aspect ratio and time to reach target temperature and suggested a guide for optimal design of THP reactor.
자동차 실내 열환경과 온열쾌적성 지표의 상관관계 도출을 위한 수치해석적 연구
박경석(K.S. Park),서진원(J.W. Seo),최윤호(Y.H. Choi),송봉하(B.H. Song),김용석(Y.S. Kim) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
Recently, interest of thermal comfort is increasing because people are spending much time in automotive cabin. Thermal comfort, emotional index about satisfaction of human body in thermal environment, was defined by the state of which physical effort of human body is minimum for adaption in thermal environment. However in the automobile development process, HVAC cooling performance is evaluated by the thermal environment standards of automotive manufacturers and this standard is inadequate for the reflection of thermal comfort. The present study established a prediction model to design the control logic of HVAC system which can apply thermal comfort of human body. In this study, we evaluated thermal environment for 6 sections and thermal comfort for human models according to various airflows and cooling time of HVAC system.
자동차용 공기청정기의 성능 평가 및 설치 조건 도출을 위한 수치해석적 연구
이용훈(Y.H. Lee),서진원(J.W. Seo),박재홍(J.H. Park),최윤호(Y.H. Choi) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
In this study, an air cleaner is considered to improve comfort, safety, and health of automobile passengers. The performance and installation conditions of the air cleaner have been studied to investigate their effects on the air quality in the cabin room using numerical analysis. A five-passenger sedan and a seven-passenger minivan that have comparatively large indoor volume have been considered. The distributions of the local mean age and the volume averaged age of indoor air are calculated according to the variation of the placement and the air flow of the air cleaner. In addition, a decrease of contamination concentration, especially VOCs(volatile organic compounds), by the air cleaner is numerically analyzed with time-accurate unsteady calculation to quantify the effect of the air cleaner on the indoor air quality. As a result, the effective installation and operation conditions of the air cleaner for the automobile cabin room could be suggested.
실내 온열쾌적성 평가를 위한 인체 모델링 및 격자특성에 대한 수치해석적 연구
박재홍(J. H. Park),서진원(J. W. Seo),최윤호(Y. H. Choi) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
Recently, research on evaluating thermal comfort by using CFD has been vigorously active. This research evaluates not only distribution of temperature and air flow analysing but also thermal comfort in indoor space by applying human model. But research of human model’s shape, Grid characteristic and turbulence model has not yet been studied. In this paper, human model’s shape, physical characteristic of variable Grid, and change of turbulence model has been studies by CFD. In this study, FLUENT is used for analysis and PMV(Predicted Mean Vote), PPD(predicted Percentage Dissatisfied) and EHT(Equivalent Homogeneous Temperature} are used for evaluation and comparison of thermal comfort. As a result, it shows that shape of CSP and lattice features does not affect on global flow field or evaluation on PMV, PPD. However, it demonstrates more precise result from evaluation of thermal comfort by equivalent temperature when it used detailed human model considering prism grid.
자동차용 HVAC 시스템의 air-vent 고려 여부에 따른 차 실내 온열쾌적성 평가에 관한 연구
윤성현(S.H. Yoon),서진원(J.W. Seo),최윤호(Y.H. Choi),송봉하(B.H. Song),김용석(Y.S. Kim) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
The automotive HVAC system plays various roles such as car indoor heating, cooling and air quality control. This HVAC system consists of air-vents, ducts, heater, evaporator, HVAC module, etc. Recently, the research related with this is being performed through numerical analysis as well as experiments. A large amount of computation time is required when considering all parts of complicated HVAC system including an air-vent because the number of grid would be increased. Also, the working time will be increased if you perform the parametric analysis about the directions of an air-vent which decides an air discharge angle because CAD(modifying the geometry) and grid regeneration tasks are required. In this study, we removed the HVAC system including the air-vent from the computational domain and imposed the direction of the flow by using vector in order to shorten the working time according to the modification of the air-vent geometry. Also, it is expected that there will be a change in the car interior flow depending on consideration of air vent, so we performed various parametric study in order to set the flow without HVAC system to be the same flow considered the real geometry of air-vent.