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유호선,김영인,Yoo, H.S.,Kim, Y.I. 대한설비공학회 1989 설비공학 논문집 Vol.1 No.1
This paper presents an analysis to predict thermal behaviors of water in ice storage tank during the coldness release process. To deal with complicated transient phenomena due to ice-water phase change and the density inversion, a theoretical model which consists of initial perfectly mixed, stratified and thermal diffusion state was introduced and a criterion on the growth of thermal boundary layer was developed. The analysis includes considerations on the type of ice-making heat exchanger, refrigerator on/off and tank arrangement. Also, discussions on the various parameters and operating conditions which have influence on the performance of the system were made. Finally, simulated results were shown, which agreed with experiments in trends reasonably.
[가솔린엔진부문] 상용기관 연소실 형상을 갖는 정적 연소기에서의 플라즈마 제트 점화에 의한 연소특성
류현욱(H.W.Ryu),박정서(J.S.Park),유호선(H.S.Yoo),김문헌(M.H.Kim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
In this paper. combustion characteristics ignited by single-hole and multi-hole plasm jet igniter and conventional spark plug have been studied by means of schlieren photography and pressure measuring in the Pent-roof type and the Toroidal bowl type constant volume vessel which is typical 4-valve 51 engine combustion chamber. It is represented that combustion characteristics ignited by conventional spark plug ignition are hardly influenced by configurations of combustion chamber. In contrast. in case of plasma jet ignition, combustion duration and combustion enhancement rates are effected than spark plug ignition. Consequently. it is important to avoid plasma jet impingement against combustion chamber wall. and to let flame front move toward wide place in the combustion chamber at early stage of combustion
정재동,정인성,유호선,이준식,Chung, J.D.,Jung, I.S.,Yoo, H.,Lee, J.S. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.3
This paper presents a theoretical model for predicting transient behaviors during storage process of the cool storage system using the R141b clathrate. Introduction of the lumped capacitance method along with a brine reservoir having large thermal capacity yields a set of simplified energy equations. Based on the Arrhenius equation and the known experimental findings, the formation rate of clathrate for which the degree of subcooling is properly accounted is newly developed. An effective nondimensionalization of the model equations facilitates the closure of modeling as well as parametric study. Calculated results for a specific case not only simulate a typical pattern of temperautre variation in the tank successfully, but also agree reasonably well with available data. The effect of each characteristic parameter on the system performance is also investigated. It is revealed that the dominant among relevant parameters are the activation energy of reaction, the degree of subcoling and the initial mass fraction of refrigerant. Finally, the uncertainty associated with modeling of the shaft work variation appears to need further studies.
정병용(B.Y. Jeong),이재헌(J.H. Lee),여영구(Y.K. Yeo),문승재(S.J. Moon),유호선(H.S. Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The booster fans for the flue gas desulfurization(FGD) plant of heavy oil fired 200㎿ power plant transport the flue gas from the boiler to the FGD Plant. The fan is exposed to the gases contained sulphur dioxide and nitrous oxides together with moisture, soot particles and small amounts of ash. Blades need rotary motion and adequate corrosion-erosion resistance at the same time. A solution to the both of them, they has been used Metcoloy®2 as protective coating but it is failed. In this study, investigated the coating failure of the blades of booster fans. Bond strength tests and practical field experiences have demonstrated that High Velocity Oxy-fuel(HVOF) coating method with Diamalloy 3004, as and alternative to Metcoloy®2