• Title/Summary/Keyword: Energy separation

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A Study on the Belt width and Separation of Tire using FEM (FEM을 이용한 Belt Width와 Separation에 관한 연구)

  • Kim S.R.;Sung K.D.;Kim S.S.;Cho C.T.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.2006-2010
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    • 2005
  • This study is concerned with the relation between steelbelt and belt edge separation. Belt edge separation causes tire burst and threatens passenger's safety. For that reason, it is important to predict durability caused by belt edge separation first in tire structure design step. In this study, to predict belt edge separation, we suggest the prediction method of belt edge separation and evaluate the effect of steelbelt width on the belt edge separation using FEM. We study on analysis parameter also to do exact estimation about the shear behaviour of belt edge area.

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Hydrogen Separation by Compact-type Silica Membrane Process (컴팩트 타입 실리카막 공정을 이용한 수소 분리)

  • Moon, Jong-Ho;Bae, Ji-Han;Lee, Sang-Jin;Chung, Jong-Tae;Lee, Chang-Ha
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.11a
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    • pp.336-339
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    • 2006
  • With the steady depletion off fossil fuel reserves, hydrogen based energy sources become increasingly attractive. Therefore hydrogen production or separation technologies, such as Bas separation membrane based on adsorption technology, have received enormous attention in the industrial and academic fields. In this study, the transport mechanisms of the MTES (methyltriethoxysilane) templating silica/a-alumina composite membrane were evaluated by using unary, binary and quaternary hydrogen gas mixtures permeation experiments at unsteady- and steady-states. Since the permeation flux in the MTES membrane, through the experimental and theoretical study, was affected by molecular sieving effects as well as surface diffusion properties, the kinetic and equilibrium separation should be considered simultaneously in the membrane according to molecular properties. In order to depict the transient multi-component permeation on the templating silica membrane, the GMS (generalized Maxwell-Stefan) and DGM (dust Bas model) were adapted to unsteady-state material balance

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New Pervaporation Membrane for Petroleum Separation

  • Nam, Sang-Yong;John R. Dorgan
    • Proceedings of the Membrane Society of Korea Conference
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    • 2003.07a
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    • pp.77-80
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    • 2003
  • Hydrocarbon-hydrocarbon separations are one of the most important processes in petroleum refining. Distillation process has been used for separating hydrocarbons, but this conventional process is very energy consuming. Pervaporation separation through polymeric membranes is an emerging process alternative to distillation because of energy savings, compact system installation, reduced capital investment, and other performance attributes. In hydrocarbon separations, polymeric membranes are easily swollen by hydrocarbons and can lose mechanical strength. Chemically robust membranes are needed for the separation of hydrocarbons. In this study, the blend membrane was applied to separate benzene and cyclohexane. This is a model system for aliphatic and aromatic separation. Cyclohexane is also physically very similar to benzene and as a result of the very closing boiling points (0.6$^{\circ}C$), benzene and cyclohexane form an azetrope. Thus the system provides a good model for azeotrope breaking by pervaporation. The semi-quantitative thermodynamic model predicts that the calculated selectivity increases with increasing Hydrin contents in the blend membranes. Pervaporation experiments utilizing various operating temperatures and feed concentrations with different blend membranes are compared with the result from semi-quantitative thermodynamic calculations.

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Effects of Tube Materials and Cooling Media on the Energy Separation in Vortex Tubes

  • Riu, Kap-Jong;Kim, Hyun-Woo;Park, In-Su;Kim, Byung-Ha
    • International Journal of Air-Conditioning and Refrigeration
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    • v.10 no.3
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    • pp.138-146
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    • 2002
  • The phenomena of energy separation in vortex tubes was investigated experimentally to see the subsidiary effect of the conductivity of tube material and cooling conditions around the outer surface of the tube. The experiment was carried out with pyrex, stainless steel and copper tubes, and the heat transfer conditions of the tubes were with insulation, without in-sulation and water cooling modes respectively The results were obtained that the hot exit fluid temperature was highly affected by a change of conductivity of a tube when the outer surface was cooled by the water, while the working fluid through the tubes was air. How-ever, the cold exit temperature was little affected by the heat transfer modes on the outer surface of the vortex tube.

A Study for Energy Separation of Vortex Tube using Air Supply System (I) - the effect of diameter of cold end orifice - (공기공급 시스템에 적용되는 Vortex Tube의 에너지 분리특성에 관한 연구(I) -저온출구 orifice의 직경변화에 의한 영향-)

  • 이병화;추홍록;상희선
    • Journal of the Korean Society of Safety
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    • v.13 no.4
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    • pp.9-18
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    • 1998
  • The vortex tube is a simple device for separating a compressed gaseous fluid stream into two flows of high and low temperature without any chemical reactions. Recently, vortex tube is widely used to local cooler of industrial equipments and air supply system. The phenomena of energy separation through the vortex tube was investigated experimentally. This study is focused on the effect of the diameter of cold end orifice diameter on the energy separation. The experiment was carried out with various cold end orifice diameter ratio from 0.22 to 0.78 for different input pressure and cold air flow ratio. The experimental results were indicated that there are an optimum diameter of cold end orifice for the best cooling performance. The maximum cold air temperature difference was appeared when the diameter ratio of the cold end orifice was 0.5. The maximum cooling capacity was obtained when the diameter ratio of the cold end orifice was 0.6 and cold air flow ratio was 0.7.

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A Study on Oil Separation Performance of Crank-Case Ventilation System (크랭크실 환기장치의 오일 분리효율에 관한 연구)

  • Seo, Joon-Ho;Na, Byung-Chul;Kim, Jin-Yong;Park, Seung-Uk;Lim, Dae-Soon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.3
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    • pp.144-150
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    • 2008
  • This research aims to develop parts for advanced fuel/oil filtering re-circulation applicable to this kind of regulation proof engines. These parts can playa role of converting traditional air emission type crankcase into recovery type crankcase so that the engine can deal with environmental regulations, which do not allow minimal amount of toxic gas discharge. For the experiment, test method and specially made testing equipment are prepared. The results showed that oil separation efficiency of the cone type CCV(Crank Case Ventilation) system was higher than one of cylinder type both in bench test and in engine.

PREDICTION OF A MUTUAL SEPARATION OF ACTINIDE AND RARE EARTH GROUPS IN A MULTISTAGE REDUCTIVE EXTRACTION SYSTEM

  • Yoo, Jae-Hyung;Lee, Han-Soo;Kim, Eung-Ho
    • Nuclear Engineering and Technology
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    • v.39 no.5
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    • pp.663-672
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    • 2007
  • The mutual separation behavior of actinides and rare earths in a countercurrent multistage reductive extraction system was predicted by computer calculation. The distribution information for actinides and rare earths in the reductive extraction systems of LiCl-KCl/Cd and LiCl-KCl/Bi was collected from literature and then it was used for the calculation of a multistage extraction. The results of the concentration profiles throughout the extraction cascade, recovery yields of various metal solutes, and separation factors between the actinides and rare earths were calculated. The effects of the major process parameters, such as reducing agent content in the metal phase, number of stages, and salt/metal flow ratio, etc., on the extraction behavior were also examined.

APPLICATIONS AND A VIEW OF GAS SEPARATION BY MEMBRANES IN JAPAN (일본에서의 기체분리막의 현황 및 응용)

  • Nakagawa, Tsutomu
    • Proceedings of the Membrane Society of Korea Conference
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    • 1994.03a
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    • pp.23-52
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    • 1994
  • The development if separation technology is an important research subject as is clear from its role in the Japanese government's research abd development program for basic technology for the next generation (1981~1990). Japan is poor not only in mineral resources but also in energy resources and if a sudden change occurs in oil producing facility or an accident occurs in a nuclear power plant, then energy policy must undergo changes and economic foundations may collapse. Japan has already experienced this. Although, oil prices are stable at present and Japan can import oil at low cost due to the yen appreciation, Japan needs to promote development work for any new energy crisis that may come in the future. This has been the motive for gas separation membrane development in Japan.

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The Effect of the Thermal Conductivity of a Tube and the Convective Heat Transfer on the Outer Surface of a Tube on the Energy Separation in Vortex Tubes (튜브의 열전도도와 튜브 외면에서의 대류열전달이 보텍스튜브의 에너지 분리에 미치는 영향)

  • 유갑중;이병화;최병철
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.13 no.9
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    • pp.845-852
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    • 2001
  • The phenomena of energy separation in vortex tubes was investigated experimentally to see the effects of the conductivity of a tube and convective heat transfer on the outer surface of a tube. The experiment was carried out with different conductivity (pyrex, stainless steel and copper) of a tube and three kinds of convective heat transfer modes (adiabatic condition, natural convection (air) and forced convection (water) on the outer surface of a tube. the results were obtained that hot exit fluid temperature was highly affected by a change of conductivity of a tube when the outer surface was cooled by the forced convection of water. However, the cold exit temperature was little affected by heat transfer modes on the outer surface in vortex tubes.

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