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동력분산형 고속전철의 추진시스템용 냉각장치의 설계 연구
유성열(Ryoo Seong-Ryoul),김성대(Kim Sung-Dae),기재형(Ki Jae-Hyung),임광빈(Yim Kwang-Bin),김철주(Kim Chul-Ju) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Present, the cooling method of using a phase-change heat transfer such as immersed type, heat pipe etc is applied in cooling of high-capacity power semiconductors of the main power system for the high speed train with the concentrated traction. In order to apply these phase-change cooling system to the high speed EMU to be developed, needed are technological researches of consideration of installing space, air passage, light weight material and miniaturization. Although this research establishes design specifications through theoretical analysis and computational analysis from the basic design process of the cooling system of the propulsion system for the high-speed EMU, when details design is completed, present improvement subject and optimum design before manufacturing the prototype of the cooling system on the basis of analysis results. And then, carried out will be the performance tests through prototype manufacture and reliability estimation by components of cooling system.
소형 루프 히트파이프에 대한 작동특성 해석과 성능실험 연구
유성열(Seong-Ryoul Ryoo),성병호(Byung-Ho Sung),김철주(Chul-Ju Kim),강환국(Hawn-Kook Kang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A miniature Loop heat Pipe(LHP) has a great potential in cooling high power computer chips over a long distance. The present study was focused on modelling divers operational characteristics as a capillary limitation, heat transfer paths at the evaporator and those results were used to analyse the performance test data. The experimental model of LHP was designed to have a maximum capacity of heat transport of about 50W when operated under room air cooling condition. The evaporator was of a flat cylindrical shape(30D×14.5H㎜). Ethanol was used as a working fluid. Temperatures at the liquid and vapor lines, evaporator and condenser walls were measured.
추진시스템 냉각유로의 주행풍 유동에 대한 수치해석적 연구
유성열(Ryoo Seong-Ryoul),조정래,Kim Sung-Dae,조태식,Yim Kwang-Bin,김철주(Kim Chul-Ju) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5
The cooling technology of power conversion semiconductors in the propulsion system for the HEMU(High Electrical Multi Unit) are applied in water cooling method and phase change method such as the immersed type and the heat pipe type. Both of cooling systems need a condenser and a fan through forced wind to emit that is radiated heat from electric power conversion semiconductor(IGBT) stack effectively, now in the case of Japanese Fastec 360S, is using ram-air that is flowed in establishing cooling passage to propulsion system for cooling of condenser. In this research, it is that achieved the computing numerical analysis using ADINA of commertial program to examine flow characteristics and pressure distribution of ram-air for a condenser in cooling passage.
유성열(Seong-Ryoul Ryoo),조정래(Jung-Rae Jo),김철주(Chul-Ju Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In present, a cooling technology that use heat pipe worldwide is applied in various form usually such as CPU and GPU cooler in computer, power semiconductor cooling etc. as well as electronic component cooling in the aerospace industry. But there are not much applied an instance of loop heat pipes (LHPs) that mainly done by Maidanik et al., except the aerospace industry. It is seemed the reason that is complicated to design and manufacture technology of LHP, and were not secured by operation reiablity, stability and economical efficiency. Specially, it is difficult to achieve technologically that manufactures the evaporator and sintered wick inside. In order to present basis technology about design and manufacture of LHP applied to cool down power conversion semiconductors, this research examined heat transfer limitations and tested operating performance.
유성열(Seong-Ryoul Ryoo),목진성(Chin-Sung Mock),조태식(Tae-Sik Cho),김철주(Chul-Ju Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The present study deals with the results of a thermo-fluid analysis applied to the cooling plate of the water cooling system developed for IGBT stacks which was designed to keep the power semi-conductors from over heating problems. The cooling plate is to absorb a maximum quantity of 10kW from 4 IGBTs which are to be placed on both sides of the cooling plate 2 IGBTs of them on each surface. For the analysis Adina of CFD Program was used and an analysis was conducted to obtain the knowledges on heat and mass flow at both the plate and fluid flow inside. For the simulation the operational conditions of a temperature difference of 15℃ for the working fluid and a uniform heat flux of about 92000 W/m2 on the surface in contact with an IGBTs.
평판형 윅을 갖는 소형 루프 히트파이프의 윅 건조한계에 대한 해석적 연구
유성열(Seong-ryoul Ryoo),성병호(Sung-ho Byung),최지훈(Ji-hoon Choi),김철주(Chul-ju Kim),임광빈(Kwang-bin Lim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In principle of LHP operation it is assumed that the evaporation of working fluid takes place at the interface of heating wall and the primary wick, admitting the complete saturation of porous wick with the liquid phase. But it has been found from lots of experimental investigations that the line of vapor-liquid meniscus draws back toward the center of the wick with an increasing heat load, showing the existence of a dried zone. The appearance of dried zone changes the flow mechanism through the wick, resulting in increasing the pressure drop over the wick. This is the origin of wick dry limitation for LHPs. The quantity of wick dry limitation seems to lie on the depth of dried zone but in reality it is a complicate matter to predict the vapor front line as a function of wick geometry parameters, fluid properties and rates of heat supply. In this study wick limitation was measured from experiments using the given LHP model developed for the present study and the data were put to evaluate the existing depth of dried zone as a function of heat rates.
전력변환반도체 냉각용 수냉각장치의 작동특성에 관한 연구
유성열(Ryoo Seong-Ryoul),김성대(Kim Sung-Dae),임광빈(Yim Kwang-Bin),김철주(Kim Chul-Ju) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5
The cooling technology of power conversion semiconductors in the propulsion system for the HEMU(High Electrical Multi Unit) are applied in water cooling method and phase change method such as the immersed type and the heat pipe type. This research designs and manufactures the water cooling system that could cool about heat load Q=2㎾ and performance tests to apply it by an electric power conversion semiconductors(IGBT) cooling technology. Experimental condition made change of a flow rate, an air velocity and a heat load to confirm operation characteristics of water cooling device, and when is heat load 2㎾, air velocity 20 m/s, and water flow rate 7㎏/s, it is about 80℃ to temperature of cooling plate.
동력분산형 고속전철의 추진시스템용 냉각장치 설계 및 시제품 제작 연구
유성열(Ryoo Seong-Ryoul),김성대(Kim Sung-Dae),기재형(Ki Jae-Hyung),임광빈(Yim Kwang-Bin),김철주(Kim Chul-Ju) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The objective of the present study is to develope a propultion unit cooling system for the next-generation High-speed EMU. The propulsion power control unit consists of some IGBT semiconductors. In general, those power semiconductors are very sensitive to temperatures and need a cooling system to keep them at a proper operational conditions in the range of 50~100℃. In this first year of study, we tried to focuss on the understanding of fundamental technologies for each of the two different cooling systems and collecting basic data for design and manufacturing for both cases. For the water cooling system, a heat sink with multi channels of liquid flow was considered and a model unit was designed and performance test was conducted. For the heat pipe cooling system, a Loop Heat Pipe(LHP) was considered as an element to transport heat from IGBT to environment air flow and a model unit was designed and performance test was conducted. The analysis using SINDA/FLUINT showed that those design parameters are good enough for the LHP to properly operate under a heat load up to around 360W.