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수치모사를 이용한 CDI Unit Cell 내부의 유로성능 평가
손덕영(D.Y. Sohn),최윤호(Y.H. Choi),박대욱(D.W. Park),정충효(C.H. Jung) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.1
In the present study, computations for flow fields inside the CDI unit cells with electrodes and spacers have been made to evaluate their performance. Three types of unit cells that include a planar type, a serpentine channel type, and a spiral wound type were considered and their flow characteristics were compared. From the computational results, it is found that the serpentine channel type has a large flow resistance and can not guarantee the outflow flux for industrial applications. On the other hand, the planar type can sustain a large enough outflow flux but it's efficiency is low for the electrode-use because of the non-uniform velocity distribution inside the cell and dead zones in every corner. Finally, The spiral wound type has not only a large outflow flux as much as the planar type has, but also a high efficiency for the electrode-use because of uniform velocity distribution. From this comparison, we can expect that the spiral wound type of CDI unit cell would have a high performance deionization capability.
박준용(J.Y. Park),구한범(H.B. Koo),손덕영(D.Y. Sohn),이정일(J.I. Lee),최윤호(Y.H. Choi),소상영(S.Y. So),이나리(N.R. Lee) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.11
Vortex tube is an energy separation device using high pressure for dividing hot and cold air with simple geometry. The phenomenon of energy separation in vortex tube is not identified yet. For this reason, most of study about the impact on performance according to the shape has been made by experiments. In this study, we compared 10 factors what we think affecting performance of vortex tube in low pressure condition using Plackett-Burman Design. We calculate and analyze mass flow rate(m), temperature difference at cold exit(ΔT<SUB>c</SUB>), and cooling power(W) using CFD. The analysis for the results is made for the main effects that do not interact with other factors. As a result, we found inlet mass flow rate and ΔT<SUB>c</SUB> have large dependence on nozzle area factors. If nozzle area is wider, mass flow rate become greater. In opposite case, ΔT<SUB>c</SUB> become greater. And we found cooling power has large dependence on vortex generator diameter and tube diameter. Therefore, performance of vortex tube can be improved by appropriately selecting design factors.
다양한 형태를 가진 CDI unit cell의 내부 유동특성에 관한 수치해석적 연구
권용민(Y.M. Gwon),손덕영(D.Y. Sohn),최윤호(Y.H Choi),송명섭(M.S. Song),정인조(I.J. Jung),박승경(S.G. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
In the present study, Numerical simulations for flow fields inside the various CDI unit cells with electrodes and spacer have been made to evaluate their flow performance. Six types of unit cells that include a parallel type, a rectangular centralized type, a circular centralized type, a modified centralized type, a serpentine type, a spiral type were considered and their flow characteristics were compared.
공조 시스템이 후드겸용 전자레인지 포집효율에 미치는 영향에 관한 수치해석적 연구
권용민(Y.M. Gwon),손덕영(D.Y. Sohn),최윤호(Y.H. Choi),정희수(H.S. Jung),홍석만(S.M. Hong) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
The Over-The-Range(OTR) which is a microwave-hood combination includes a ventilation and cooking system. The ventilation system removes fumes and moisture generated in the main cooking device during the cooking process. However, the OTR has a low capture efficiency for a variety of reasons. The room ventilation system is one of the main effects to decrease the capture efficiency. In this paper, the performance and installation conditions of the OTR has been studied to investigate the effect of room ventilation system on the capture efficiency using numerical analysis.
Vanadium 레독스 흐름 전지 성능 개선을 위한 수치해석적 연구
박준용(J.Y. Park),손덕영(D.Y. Sohn),최윤호(Y.H. Choi) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.1
The redox flow battery (RFB), an ESS (Energy Storage System), is a device that generates or stores electricity through the reduction-oxidation reactions between active materials constituting the electrolyte. RFB consists mainly of an electrolyte tank which determines the capacity of the battery, and a cell stack which determines the output. Since these components can be independently controlled, RFB has the advantage of a large capacity and a long lifespan. In this study, in order to improve the battery output, the new flow channel in the flow frame has been suggested by maximizing the reaction area of the RFB and minimizing the energy loss due to the pump. For this purpose, we used the variability range coefficient (R<SUB>i</SUB>) to check if the flow rate discharged to the electrode is uniform. This coefficient decreased from 0.0717 to 0.0073 m/s at the electrode outlet. Also the new design exhibited an average 44% reduction in pressure drop for the whole flow frame geometry.
김수경(S.K. Kim),손덕영(D.Y. Sohn),최윤호(Y.H. Choi),강근(G. Kang) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
The characteristics of a condenser dryer and a vented dryer that are common types of domestic clothes dryers for home use are predicted and compared in an effort to improve the efficiency and to overcome economical and environmental problems due to its inefficient power consumption. In the present study, a drying system is simplified by assuming the mechanism is composed of several elements such as heater and drum and mathematical models using the mass and energy conservation of moisture and air through each element are defined. Based on this mathematical model, the computational tool is developed to predict temperature, humidity and enthalpy of moisture and air in a drum and remained moisture contents (RMC) in drying materials. The computational results are verified by comparing with experimental results from existing studies. In addition, the efficiency of a dryer is calculated using these predicted results for a given condition and the drying characteristics of a condenser dryer and a vented dryer are compared and analyzed.
Vortex Tube 성능 개선을 위한 절두체의 형상 매개변수에 대한 연구
구한범(H.B. Koo),박준용(J.Y. Park),손덕영(D.Y. Sohn),최윤호(Y.H. Choi) 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.4
Vortex tube is a thermal static device that separates compressed air into hot and cold streams. In general, the cooling efficiency of vortex tubes is lower than that of traditional air conditioning equipment and vortex tubes are mainly used for industrial spot cooling applications because of their quick responses. In this study, conical frustums are employed in the nozzle chamber to improve the cooling performance. Conical frustums can be used to decrease the ineffective mass fraction that directly passes through the cold exit without energy separation. The shape optimization of conical frustums has been performed using full factorial design. It is found that the height of frustums has the largest main effects on the cooling performance. Computational results show that the cooling performance can be increased by about 10% within the considered range of the design parameters. This is because the ineffective mass fraction toward the cold exit is decreased by about 20%.