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공기청정기와 기류 제어용 FAN의 운전조건에 따른 교실 내 공기질 변화에 대한 해석적 연구
우상무,송해은,강율호,안영철 대한설비공학회 2023 설비공학 논문집 Vol.35 No.5
This study investigated the influence of the operating conditions on an air purifier and extra FAN efficiency in reducing particulate matter in a classrooms. Computational fluid dynamics (CFD) simulation considering three locations of Air purifiers and operating conditions of four FANs was conducted to evaluate the optimal operating condition. In this study, the Clean Air Delivery Rate (CADR) of Air purifier was 2.4 m3/min (161.4 CMH) and 4.8 m3/min(322.8 CMH). Assuming the indoor particulate concentration is 150 μg/m3, the performance of reducing particle concentration varies by a maximum of 31.2% depending on the position of the air purifier and the operating condition of the FAN. When the CADR of the air purifier is low, particulate matter reduction performance can be improved by a FAN. When using the FAN, make sure that it does not interfere with the airflow of the air purifier.
고층 건물의 열병합발전용 배기연도의 설계에 따른 건물 내벽의 온도 상승에 대한 해석적 연구
우상무(Sang Moo Woo),송해은(Hae Eun Song),강율호(Yul Ho Kang),안영철(Young Chul Ahn) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
건축물의 규모에 따라 건물에너지의 자립화를 위해 열병합 발전 설비가 적용되는 경우에 배기가스가 배출되는 연도에서 실내 공간으로의 열 에너지가 전도되어 내부 온도가 상승하는 현상이 발생한다. 실내 온도가 상승함으로 인해서 쾌적성의 저하와 냉수 보급온도가 상승되는 불편함을 초래하기도 한다. 본 연구에서는 Full Modeling을 활용한 CFD 해석을 통해 배기연도의 설계변수로 단열재 보강 및 배기가스 온도를 낮추는 경우에서 건물 내벽의 온도를 검토하였다. 기본 설계 모델에서 단열재를 2배로 증가 시킨 경우에는 샤프트실 내벽 온도는 14.2% 감소, 콘크리트 외벽 온도는 12.2% 감소하였고, 배기가스 온도를 200℃로 20% 낮춘 경우에는 샤프트실 내벽 온도는 12.7% 감소, 콘크리트 외벽 온도는 10.8% 감소하였다.
박준무(Jun-Mu Park),이승효(Seung-Hyo Lee),우상균(Sang-Kyun Woo),추인엽(In-Yeop Chu),이명훈(Myeong-Hoon Lee) 한국표면공학회 2018 한국표면공학회지 Vol.51 No.5
Harsh seawater environment is subdivided into marine atmosphere, splash zone, tidal zone, submerged zone and bottom of sea depending on the exposed part. Since corrosion rate depends on the conditions of the exposed parts, proper protection and maintenance for each parts are essential for long-term use of steel structures in seawater environment. For steel structures which were installed in Shiwha Lake, a special maintenance system is required to guarantee its long-term durability and safety. As the tidal power plant has recently been operated, the salinity has risen due to the rapid influx of seawater upstream into Sihwa Lake and the corrosion tendency of the structure is variable according to the water level fluctuation. In this study, corrosion properties of steel structures under water level fluctuation was evaluated by corrosion rate measurement, visual inspection and natural potential measurement and their durability and life management were discussed in view of the effect of variation in of seawater level fluctuations in Shihwa Lake.
열전달 효과를 고려한 비행체 낫셀의 엔진 부품 전산해석 연구
원성식,우상무,안형진,박원규 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.4
In a certain flight envelope, the surface of engine of aircraft has very high temperature and the heat is delivered to the linear replacement units in a form of complex of convection and radiation. This kind of mixed heat transfer should be seriously considered, because it may not adjust the limit temperature condition of several linear replacement units inside Nacelle and it can cause mechanical failure or fire. This thesis is about whether the linear replacement units of the engine with mixed heat transfer made from high temperature of the engine surface in each different flight envelopments with different speed conditions adjust the limit temperature condition.