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상변화물질을 이용한 잠열축열조에 관한 기초 연구 - 수평원관내에서의 내향용융 및 응고열전달 실험 -
김일겸,조남철,김준근,이채문,임장순,Kim, I.G.,Cho, N.C.,Kim, J.G.,Lee, C.M.,Yim, C.S. 대한설비공학회 1989 설비공학 논문집 Vol.1 No.4
Heat transfer phenomena during inward melting and solidification process of the phase change material were studied expertimentally. The phase change medium was 99% pure n-docosane paraffin ($C_{22}H_{46}$). The solid-liquid interface motion during phase change was recorded photographically. Measurements were made on the temperature, the solid-liquid interface, the melted or frozen mass and the various energy components stored or extracted from the cylinder wall. For melting, the experimental results reaffirmed the dominant role played by the conduction at an early stage, by the natural convection at longer time. For solidification, natural convection effects in the superheated liquid were modest and were confined to short freezing time. Although the latent energy is the largest contributor to the total stored or extracted energy, the aggregate sensible energies can make a significant contribution, especially at large cylinder wall superheating or subcooling, large initial phase change material subcooling or superheating.
김일겸(I.G.Kim),박상록(S.R.Park),고재윤(J.Y.Koh),김영중(Y.J.Kim),김준근(J.G.Kim),임장순(C.S.Yim) 한국태양에너지학회 1998 한국태양에너지학회 논문집 Vol.18 No.2
본 연구에서는 냉매 를 사용한 배치형 열펌프건조기(Batch type heat pump dryer)에 대하여 수치적 해석을 수행하였다. 즉 냉매의 과열도와 과냉도를 일정하게 유지하고 공기의 질량유량, 공기의 바이패스비(bypass ratio), 압축기의 회전속도, 건조기의 입구건구온도에 따른 건조기의 성능을 분석하였다. SMER에 대하여 수치해와 실험치를 비교한 결과 최대 10%이내에서 잘 일치 하였다. 또한 공기의 질량유량에 대하여 적정공기의 바이패스비가 존재하며, 건조기 입구온도가 35℃이고, 압축기 회전속도가 1360rpm일 때, 공기질량유량이 0.5kg/s에서는 공기의 바이패스비가 30%, 0.7kg/s에서는 공기의 바이패스비가 40%, 0.9kg/s와 1.1kg/s에서는 공기의 바이패스비가 50%에서 최대의 SMER이 나타났다. 그리고 압축기의 회전속도가 증가함에 따라 SMER은 감소지만 COP는 증가하고 건조기의 입구건구온도가 증가함에 따라 SMER과 COP는 감소하는 것으로 나타났다. This study carried out a numerical analysis on a heat pump assisted dryer using HFCl34a. Under the constant degree of superheat and that of subcooling, we analyzed the performance of heat pump assisted dryer with varying an air mass velocity, bypass air ratio, compressor speed and an inlet bulb temperature of dryer. Simulation results were compared with experimental results, so they were maximally agreed in the range of 10%. There was the proper bypass air ratio with varying an air mass velocity. As for the effect of Sl'v1ER having the inlet temperature 35°C and compressor speed 1360rpm, bypass air ratio was 30 % at the front velocity 0.5kg/s, 40% at the front velocity 0.7kg/s and 50% at the front velocity 0.9kg/s and 1.1kg/s. As the compressor speed was increased, SMER decreased and COP increased. As the inlet bulb temperature was increased. SMER and COP decreased.
김정석(J. S. Kim),서승일(S. I. Seo),김일겸(I. G. Kim),강동훈(D. H. Knag),임재용(J. Y. LIM),김정국(J. G. Kim) 한국도시철도학회 2014 한국도시철도학회논문집 Vol.2 No.3
A prototype for a personal mobility device was developed. The personal mobility device was designed to have its basic functions such as driving, braking and steering and the operation test was performed on real road based on asphalt. Performance assessment included maximum speed, charge retention capacity, maximum climbing angle, and etc. The experimental data, performance results of a prototype, reported here can help improving its performance and reducing efforts on the development processes of an enhanced device with passenger safety and transportability.
가스보일러 코일형 열교환기의 열전달 특성에 관한 실험적 연구
홍성혁,김영기,김일겸,김동춘,이창언,임장순,Hong, S.H.,Kim, Y.K.,Kim, I.G.,Kim, D.C.,Lee, C.E.,Yim, C.S. 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.18 No.4
The performance of gas-fired boilers were experimentally investigated. The heat exchanger used for the experiments consisted of circular tube with longitudinal fins for the gas side and a spiral coil for the water side. The burner was located at the top of the heat exchanger, and the burned gas flowed down to the exit. The experiments carried out for different water flow rates, the heat capacities of the boiler and the number of baffle. The thermal efficiency of the upward flow was higher than that of the downward flow of the water in the heat exchanger. As the boiler capacity increased, the thermal efficiency decreased. As the number of the baffles increase, the thermal efficiency increased and the increasing rate of the efficiency decreased. The gas-side overall heat transfer coefficient was independent of the flow rate of the water. The effect of the number of the baffles on the heat transfer coefficient was greater than that of the boiler capacity.