http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
안영철(Youngchull Ahn),조재민(Jaemin Cho),이재근(Jaekeun Lee),이현욱(Hyunuk Lee),안승표(Seungphyo Ahn),윤덕현(Deokhyun Youn),강태욱(Taewook Kang),옥주호(Juho Ock) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The air-side particulate fouling in the heat exchangers of HVAC applications degrades the performance of<br/> cooling capacity, pressure drop across a heat exchanger, and indoor air quality. Indoor and outdoor air<br/> contaminants foul heat exchangers. The purpose of this study is to investigate the fouling characteristics<br/> trough accelerated tests. The fouling characteristics are analyzed as functions of a dust concentration (1.28<br/> and 3.84 g/㎥), a face velocity (0.5, 1.0, and 1.5 m/s), and a surface condition. The cooling capacity in the<br/> slitted finned-tube heat exchangers at the face velocity of 1 m/s decreases about 2% and the pressure drop<br/> increases up to 57%. The rate of build-up of fouling is observed to be 3 times slower for this three-fold<br/> reduction of dust concentration whilst still approaching the same asymptotic level.
김길태(Giltae Kim),안영철(Youngchull Ahn),이주용(Juyoung Lee),최재원(Jaewon Choi),신희수(Heesoo Shin),이재근(Jaekeun Lee),성창모(Changmo Sung) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Polymeric fibers with nanometer-scale diameters are produced by electrospinning. When the electrical<br/> forces at the surface of a polymer solution or melt overcome the surface tension then electrospinning occurs.<br/> Polyethylene oxide (PEO), Polycarbonate have been electrospun in our laboratory. Electrospun fibers are<br/> observed by optical microscopy or scanning electron microscopy. The average diameters of the electrospun<br/> fibers range from 300 nm to 30 nm when the electric field strength increasing from 1 kV/cm to 3 kV/cm.<br/> The average diameters of the electrospun fibers range from 200 nm to 30 nm when the concentration<br/> decreasing from 10 wt% to 4 wt%.
TiO₂나노 입자를 이용한 휘발성 유기 화합물의 광분해에 관한 실험적 연구
이주용(Juyong Lee),김성찬(Seongchan Kim),안영철(Youngchull Ahn),황유진(Eugene Hwang),이재근(Jaekeun Lee),황정성(Jungsung Hwang),김태호(Taeho Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In this experiment, the oxidations of p-Xylene (140-180 ppmv), one of the air pollutants as a VOC, using<br/> UV/TiO₂ photocatalyst is studied. In order to increase the specific surface area, the filter is coated by nano<br/> TiO₂ particles. The photodegradation system consists of a VOCs generator, a photocatalyst filter and a<br/> measuring equipment. Illumination is generally provided by two of 20 W black light lamps with 380 nm of<br/> wavelength. The filter coated by nano TiO₂ particles has a passing efficiency over 80% but a pressure drop<br/> of 9.0 mmH2O at 0.45 cm/s. The filter endurance is better than activated carbon at the same pressure drop.
수치해석을 이용한 초고층 주거건물에서 외풍영향에 의한 외벽 압력 분포 분석
김치완(Chiwan Kim),양순창(Soonchang Yang),안영철(Youngchull Ahn) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.10
The object of this study is to analyze and evaluate outdoor wind pressure effect in a high-rise residential building when seasonal wind blow on coast area. The target building consists of 3 tower buildings over 250m in height. For the evaluation of the outdoor wind effect, CFD simulation was performed. The results of the simulations are as follows:1) In that case of high-rise building, horizontal stream is more affected than vertical stream. 2) In case of summer season northeasterly wind, building pressure distributions are unstable and surface pressures of outside are effected respectively. 3) In case of winter season westerly wind, building preassure differentiations are not so much because of screening effects of the B, and the C buildings. 4) In case of winter season northwesterly wind, front wind affects on the A building directly because of no obstacles.
초고층 주거건물에서 굴뚝효과와 외풍영향에 인한 실내 환기 기류해석 및 평가에 관한 연구
김치완(Chiwan Kim),임태건(Taekun Lim),안영철(Youngchull Ahn) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.12
The purpose of this study is to analyze and evaluate the 3 types of indoor ventilation methods such as natural, mechanical, and hybrid ventilation in high-rise building which is affected by stack effect and outdoor air pressure. For the evaluation of the ventilation capacity, CFD simulation was performed in a typical high-rise residential building. The results of the simulations are as follows:1) Natural ventilation method is not enough to the regulation. 2) In case of mechanical ventilation, congested area is occurred but meets the regulation. 3) In case of hybrid ventilation with stack effect, all the areas of indoor meet the regulation and congested area is reduced. 4) In case of high-rise building, the differences of ventilation rate among houses in the building are not large because the mechanical ventilation is main factor.
정성일(Seongir Choeng),김태완(Taewan Kim),이창건(Changgun Lee),김두현(Doohyun Kim),안영철(Youngchull Ahn),이재근(Jaekeun Lee),황유진(Yujin Hwang) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.8
A coolant operating condition in a fuel ceil stack was an important factor to determine the temperature distribution which affected the fuel cell performance and relative humidity. In this study, the fuel cell performance was evaluated as a function of the coolant flow rate with the range of 0.1~0.8 liter/minㆍceil and the coolant inlet temperature of 20~82℃. The cell temperature increased with increasing the coolant inlet temperature and with decreasing the coolant flow rate. The coolant inlet temperature and flow rate to maintain the better performance of the fuel cell were in the range of 45~60℃ and 0.2~0.4 liter/minㆍcell, respectively. The experimental results showed that the optimal heat removal rate from the stack by coolant was 0.4~0.6 W/㎠ㆍcell.