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R141b 포접화합물을 이용한 축냉시스템의 성능에 관한 실험적 연구
정인성,김양규,이준식,노승탁,Jung, I.S.,Kim, Y.G.,Lee, J.S.,Ro, S.T. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.4
Experiments have carried out to investigate the effects of parameters, such as mass ratio of R141b-to-water, stirrer speed, brine inlet temperature, brine flowrate, and additives, on the performance of the cool storage system using R141b clathrate. The cool storage system in this experiment was composed of storage tank, refrigerator, and heater. The results show that the mass ratio of R141b-to-water, 1 : 3~1 : 3.5 gives the best performance and the stirring speed has optimum point as 600rpm. At this speed impeller Reynolds number is $1.01{\times}10^5$. The lower the inlet brine temperature and the highter the brine flowrate, the better performance. The addition of metal powder turned out to reduce the degree of supercooling. The supercooling reduction was proportional to the amount of the metal power. However when metal powder was added more than 0.1 wt%, there was no additional supercooling reduction. The surfactants shortened the time consumed for cool storage to the half of no surfactant added case.
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.
소형/고효율 고분자전해질 연료공급모듈용 Air Blower 개발에 관한 연구
최준혁(J.H. Choi),정인성(I.S. Jung),김주한(J.H. Kim),서정무(J.M. Seo),허진(J. Hur),성하경(H.G. Sung) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
Air Management System is composed by Pump, Fan, Compressor and Blower. In general their performances depend on the capability of the motor, power converter device and controller. Especially, it should be noticed upon designing Air Management System using for Fuel Cell System, that Pump, Fan, Compressor and Blower satisfy the condition of the high performance, high efficiency, high density and reasonable price considering the safety and Economic Efficiency. In order for this, it should be studied that which kind of Motor is the most suited for Air Management System for Fuel Cell, such as Induction Motor, Brushless DC Motor, and Switched Reluctance Motor which is widely using in industry. This paper presents the designing and manufacturing of Outer Rotor Type BLDC Motor and Driver for Air Blower of Air Management System. Experimental results from a laboratory prototype are presented to validate the feasibility of the proposed Air Blower Motor and Driver.
자동차용 Power Steering Tube Line의 진동 해석을 위한 Modeling에 대한 연구
유계형(G.H.Ryu),신귀수(G.S.Shin),김동우(D.W.Kim),이기형(K.H.Lee),정인성(I.S.Jung) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
This paper studies the effect of vibrational characteristics of a power steering tube analyzed though simulation and experiment. By an experiment analysis and a simulation analysis we found out that the factor of PS system vibration is fluid-structure interaction of tube line. Also, a new method of vibration analysis of fluid-filled piping system is developed. Analytic solutions transformed into the same form as finite-element equations are used for longitudinal, bending and torsional motion of straight, curved and double curved parts of tubes.<br/> From the results of the experimental studies and simulation modeling analysis for vibration of power steering system, we following results of the experiment FRF characteristics and mode shape through tube geometry and filled-unfilled oil of static tube condition that found out increasing natural frequency, and curved parts of tube line of characteristic is dissipate.<br/>