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남현규(Hyun-Kyu Nam),배철호(Cheol-Ho Bai),권영철(Yong-Chul Kwon),김성우(Sung-Wool Kim),주의성(Euy-Sung Chu) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
An experimental study was performed to reduce the condensation during the winter operation. The hydrochromic ink was used to detect the condensation in the total heat exchanger. The condensation within the total heat exchanger during the winter operation occurs at the cold wall of the exhaust air. When the air flow rate of the exhaust air is decreased, the condensation temperature of the exhaust air becomes lower and therefore, the condensation is reduced. While the decreasing air flow rate of the supplied air promotes the condensation by raising the condensation temperature of the exhaust air within the total heat exchanger.
대체냉매 R436B를 적용한 정수기 냉각수 시스템 신뢰성 평가에 관한 연구
남현규(Hyun-Kyu Nam),배상은(Sangeun Bai),배철호(Cheol-Ho Bai),고정수(Jung-Su Ko),진병주(Byung-Joo Jin),오주철(Ju-Chul Oh) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.8
The alternative refrigerant R436B is applied, to assess the application feasibility for a commercial cooling water system. The characteristic stability was verified by Sealed glass tube test and Autoclave test. R436B is chemically stable with the compressor material. The Oil miscibility test shows the usual compressor oil mixed well with R436B. Through the life acceleration test, the cooling performance is maintained. Though slight changes in oil and capillary tube diameter were found, they were within the permitted range. R436B should be applied to commercial cooling water systems as a simple replacement for the usual refrigerant.
남현규(Hyun-Kyu Nam),배철호(Cheol-Ho Bai) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.4
A characteristic behavior of the thermal storage tank for varying thermal load in heat pump water heater was studied. The control method was suggested and applied. By measuring the temperature within the storage tank, the heat pump was ON/OFF controlled. The appropriate measuring position and the size of heat exchanger gives the minimized power consumption of heat pump. As the length of heat exchanger increases, the temperature measuring position goes down of the storage tank and the power consumption increases.
Numerical Simulation of the Odor Spreading in a Factory
Lijo Vincent,Eun-Hwa Song(송은화),Hyun-Kyu Nam(남현규),Choon-Sik Shin(신춘식),Heuy-Dong Kim(김희동) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Liquid crystal displays (LCD's) are continuously coated with some chemicals in the clean room of a factory. Spreading of these chemicals is causing serious problems both in controlling clean room quality as well as to the workers inside the factory. It is required to alleviate or properly control the offensive odor which is mainly composed of propylene glycol mono ethyl acetate, novolak resin and photo active compound. The control strategy employed is to bleed the offensive odor gas out the clean room. A full scale 3D CFD model was created with anisotropic porous media, chemical species transport with no volumetric reaction, and thermal diffusion with propane gas (tracer gas) to simulate the odor spreading. A segregated implicit solver with standard k-ε model is employed. The detailed CFD analysis made it possible to develop an effective method of ventilating the coater room and optimizing their capacities.
이중진공관형 태양열 집열기의 하절기 과열 방지에 대한 연구
배상은(Bai Sang-Eun),배철호(Bai Cheol-Ho),남현규(Nam Hyun-Kyu),신기열(Shin Ki-Yeol),유인호(Yoo, In-Ho) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.3
The reflection plate in twin-glass evacuated tube solar collector is controlled to reduce the overheat during the summer time. The sliding type and folding types are suggested and tested. The sliding type changes the plate angle and the folding type changes the opening angle of the reflection plate. By scattering the focus of the reflected radiation from the reflection plate, the temperature rise of the working fluid can be reduced. The sliding type shows the best results in overheat reduction. When solar radiation is 900W/m², the temperature rise in one sliding type collector is reduced about 2℃ compared to that of the normal solar collector. When this method is applied to seven series-collectors in the field, the reduction of temperature rise during the summer time should be significant.