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김태안(T.-A. Kim),김윤제(Youn J. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Pressure compensating temperature control valve (TCV) is one of the important control devices which are used to constantly maintain the temperature of working fluid in power and chemical plants. the ratio of piston and hole diameters is one of the main design parameters of TCV. So ttis needs to be investigated to improve the function of control of temperature and void fraction. In this study. we investigate the flow and operating characteristics by numerical and experimental methods. The governing equations are derived from making using of three-dimensional Navier-Stokes with the standard R-ε turbulence model and SIMPLE algorithm. Using a commercial code, PHOENICS, pressure and flow fields in TCV are calculated with different port areas for cold and hot water passage. To estimate the reliability of numerical results, the inlet and outlet pressures and the ratio of two exit flow rates are compared with experimental results. Also, we prepared some results of visualization of piston location as well as ratio of flow rates.
김태안(T.-A. Kim),김윤제(Youn J. Kim) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
TCV(Temperature control valve by pressure compensation) controls temperature constantly, when it is sending steam or high temperature water to heating device of heat exchanger. For designing TCV, the ratio of piston and hole diameters is one of the important design parameters. Numerical analysis is carried out to elucidate the flow characteristics in the TCV with different port areas of cold and hot waters, using the k-ε turbulence model and Cartesian cut-cell method. Numerical results show that the exit flow rate is mainly affected by pressure distribution in the piston.
김태안(T.-A. Kim),안병재(B.-J. Ahn),김윤제(Youn J. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Pressure balancing valve is one of important control devices, which is fully automatic and no manual controls, regulating or adjustments are needed. It is typically used to maintain constant temperature of working fluid in power and chemical plants and domesitic water supply systems. Pressure balancing valve is composed of body, cylinder and balancing piston. Therefore, the balancing piston shapes are important design paramenters for a pressure balancing valve. In this study, numerical and experimental analyses are carried out with two different balancing piston shapes. Especially, the distribution of static pressure is investigated to calculate the flow coefficient(C). The governing equations are derived from making using of three-dimensional Navier-Stokes equations with standard k-ε turbulence model and SIMPLE algorithm. Using commercial code, PHOENICS, the pressure and flow fields in pressure balancing valve are depicted.
압력 평형식 온도조절 밸브 내부 유동 특성에 대한 수치적 연구
황정훈(J.-H. Hwang),김태안(T.-A. Kim),김윤제(Youn J. Kim) 한국유체기계학회 2005 유체기계 연구개발 발표회 논문집 Vol.- No.-
Temperature Control Valve (TCV) is one of the useful temperature control devices, which is used to control constant temperature of working fluid in power and chemical plants and domestic water supply systems. TCV is composed of body, cylinder and piston, and the body shape has a symmetrical H-type. In general, it has several inlet and outlet holes, and its shape is like as tubular sleeve. The piston has three rings: two rings of the end of piston have the function of controlling inlet flow rate with hot and cold working fluids, the center ring has the function of preventing hot and cold water from intermixing. Consequently, the shapes of piston and cylinder are the main design parameters in the performance of TCV. In this study, numerical analyses were carried out with two different piston and cylinder shapes to investigate the functions as a temperature control valve and the flow characteristics according to piston opening grade in TCV. Using a commercial code, FLUENT, velocity and pressure fields in TCV are obtained under steady, standard k-ε turbulence model and no-slip condition.