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주위 온도의 급격한 변화에 따른 압력 및 차압 전송기의 특성 변화
정종태(Jong-Tae Chung),하영철(Young-Cheol Ha),이철구(Cheol-Gu Lee),허재영(Jae-Young Her) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
The pressure and differential pressure(DP) transmitters are used for gas flow rate calculation on the orifice gas metering system On site, the pressure and DP transmitters are installed in a shelter to diminish the affects of environmental change such as an ambient temperature. But there has been an argument about the effectiveness of the shelter and this brought up the necessity to verify the affects of ambient temperature. These experiments were performed to verify the ambient temperature effects as observing the output of transmitters when the ambient temperature were changed from -30 ℃ to 50 ℃. The results showed that the most of transmitters were operated in the spec range of performance criteria presented by manufacturer but the rapid change of ambient temperature could cause the larger measurement error for the DP transmitter of low span than others. Therefore the pressure and DP transmitters need to be operated and controlled within the proper range of ambient temperature.
정종태(Jong-Tae Chung),하영철(Young-Cheol Ha),이철구(Cheol-Gu Lee),허재영(Jae-Young Her) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
Orifice meter is the most widely used flowmeter in custody transfer between KOGAS and city gas companies. Absolute pressure value is needed to calculate the gas flow of orifice metering system, but the gauge pressure transmitters are mainly used in the field. In case that the gauge pressure transmitters are used, the fixed value as standard atmospheric pressure(101.325㎪) is applied for the absolute pressure value. The real, local atmospheric pressures of each metering station are different from the standard condition as the altitude and weather conditions. In this study the flow calculation errors were quantitatively analyzed through examining the atmospheric pressures of 60 stations of KOGAS. The data for analysis are such like the time data of supplied gas amount, the altitude of each metering station, the time data of atmospheric pressures and altitudes of each weather observatory. The results showed that the local atmospheric pressures were different from the standard value and the gas flow calculation errors were distributed between -0.024% ~ 0.025% based on the supplied gas amount in the year 1999 and 2000.
유기템플레이팅 실리카막을 이용한 이성분 및 사성분 수소 분리
문종호(Moon, Jong-Ho),배지한(Bae, Ji-Han),정종태(Chung, Jong-Tae),이재욱(Lee, Jae-Wook),이창하(Lee, Chang-Ha) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
The transport mechanisms of the MTES (methyltriethoxysilane) templating silica/a-alumina composite membrane were evaluated by using four binary and one quaternary hydrogen mixtures through permeation experiments at unsteady- and steady-states. Since the permeation flux in the MTES membrane, through the experimental and theoretical studies, was affected by molecular sieving effects as well as surface diffusion properties, the kinetic and equilibrium separation should be considered simultaneously 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 gas model) were adapted to unsteady-state material balance.
문종호(Moon, Jong-Ho),배지한(Bae, Ji-Han),이상진(Lee, Sang-Jin),정종태(Chung, Jong-Tae),이창하(Lee, Chang-Ha) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
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