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RISS 인기검색어
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- 저자 : 권해성(Kwon, Hae Sung) (검색결과 7 건)
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접시형 태양열 집광 시스템을 이용한 열화학 사이클의 수소생산
권해성(Kwon, Hae Sung),오상준(Oh, Sang Jun),서태범(Seo, Tae Beom) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11
Thetwo-step water splitting thermochemi calcycleis composed of theT-R (ThermalReduction)and W-D (Water Decomposition)steps.The mechanism of this cycle is oxidation-reduction, which produces hydrogen. The reaction temperature necessary for this thermochemical cycle can be achieved by a dish-type solar thermal collector (Inha University, Korea). The purpose of this study is to validate a water splitting device in the field. The device is studied and fabricated by Kodama et al (2010,2011).The validation results show that the foam device, when loaded with NiFe2O4/m-ZrO2powder, was successfully achieved hydrogen production with 9(10 with a Xe-light solar simulator, 2009, Kodama et al.) repeated cycles under field conditions. Two foam device used in this study were tested for validation before an experiment was performed. The lab scale ferrite-conversion rate was in the range of 24~76%. Two foam devices were designed to for structural stability in this study. In the results of theexperiments, the hydrogen percentage of the weight of each foam devicewas 7.194 and 9.954μmol g<SUP>-1</SUP> onaverage, and the conversion rates 4.49~29.97 and 2.55~58.83%, respectively.
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접시형 태양열 집광 시스템과 산화세륨 및 페라이트산화물을 이용한 열화학 사이클의 수소생산
권해성(Kwon Hae Sung),오상준(Oh Sang June),서태범(Seo Tae Beom) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
The two-step water splitting thermochemical cycle is composed of the T-R (Thermal Reduction) and W-D (Water Decomposition) steps. The mechanism of this cycle is oxidation-reduction, which produces hydrogen. The reaction temperature necessary for this thermochemical cycle can be achieved by a dish-type solar thermal collector (Inha University, Korea). The purpose of this study is to validate a water splitting device in the field. The device is studied and fabricated by Kodama et al (2010, 2011). The validation results show that the foam device, when loaded with CeO2 powder, was successfully achieved hydrogen production under field conditions. Through this experiment, we can analyze the characteristics of the catalyst and able to determine which is more advantageous thing to produce hydrogen compared with previous experiment that used ferrite-device.
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접시형 태양열 집광 시스템과 산화세륨 및 페라이트산화물을 이용한 열화학 사이클의 수소생산
권해성(Kwon, Hae Sung),김동연(Kim, Dong Yeon),오상준(Oh, Sang June),서태범(Seo, Tae Beom) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
The two-step water splitting thermochemical cycle is composed of the T-R (Thermal Reduction) and W-D (Water Decomposition) steps. The mechanism of this cycle is oxidation-reduction, which produces hydrogen. The reaction temperature necessary for this thermochemical cycle can be achieved by a dish-type solar thermal collector (Inha University, Korea). The purpose of this study is to validate a water splitting device in the field. The device is studied and fabricated by Kodama et al (2010, 2011). The validation results show that the foam device, when loaded with CeO2 powder, was successfully achieved hydrogen production under field conditions. Through this experiment, we can analyze the characteristics of the catalyst and able to determine which is more advantageous thing to produce hydrogen compared with previous experiment that used ferrite-device.
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접시형 태양열 집광 시스템을 이용한 열화학 사이클의 수소생산
권해성(Haesung Kwon),신예원(Yewon Shin),오상준(sangjune Oh),서태범(Taebeom Seo) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The two-step water splitting thermochemical cycle is composed of the T-R (Thermal Reduction) and W-D (Water Decomposition) steps. The reaction temperature necessary for this thermochemical cycle can be achieved by a dish-type solar thermal collector. The purpose of this study is to validate a water splitting device in the field. The validation results show that the foam device, when loaded with NiFe2O4/m-ZrO2 powder, was successfully achieved hydrogen production with 9 repeated cycles under field conditions. Two foam device used in this study were tested for validation before an experiment was performed. The lab scale ferrite-conversion rate was in the range of 24~76%. Two foam devices were designed to for structural stability in this study. In the results of the experiments, the hydrogen percentage of the weight of each foam device was 6.145 and 6.228 NL/(kg·h) on average, and the conversion rates 4.49~29.97 and 2.55~58.83%, respectively.
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민옥기,권해성 연세대학교 산업기술연구소 1991 논문집 Vol.23 No.2
This study analyzes the running mechanism of flexible and thin tape above rotating protuberance through the numerical simulation. The scope of analysis is confined to the phenomena of elasto-hydrodynamic lubrication between the rotating cylinder with a protuberance and the running tape. This model is based on the equation of plate considering the effect of geometric nonlinearity and the modified Reynolds equation. Finite element method is adopted as a numerical simulation technique to solve the above two coupled nonlinear equations. In numerical analysis, the effects of tape tension and the relative velocity are basically evaluated.
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권해성,민옥기 연세대학교 산업기술연구소 1993 논문집 Vol.25 No.1
The running mechanism of flexible and thin foil above rotating protrusion is analyzed throught a numerical simulation. The scope of analysis is confined to the phenomena of elastohydrodynamic lubrication between the rotary drum with a running protrusion and thin foil. This mathematical analysis is based on the modified Reynolds equation and the equation of plate, considering the protrusion geometry and the effect of geometric nonlinearity. Finite element method is adopted as a numerical simulation method to solve the above coupled nonlinear equations. In numerical analysis, the effects of head window in rotary drum are evaluated. And the analysis results of the window model are compared with the those of no window model.
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민옥기,김성환,권해성 연세대학교 대학원 1989 延世論叢 Vol.25 No.1
This paper is concerned with the formulation for the finite element analysis of a 3-dimensional structure, which is composed of spot-welded plates. A spot element is introduced to represent a spot-welded point, which corresponds to an elastic connection infinite element. Since the spot element is a modified one of the 3-dimensional beam element, it has 6-d.o.f. at each nodal point. The shell element used here has 6-d.o.f. at each nodal point including a rotational d.o.f. perpendicular to itself, which can be viewed as the decoupled superposition of membrane and bending elements. The spot element connects two plates attached. The numerical results of the spot welder plate models with one or more spot welding points are as follows. (1) Under the transverse loading, the displacements of the spot welded plate models are in good agreement with those of the plate without spot welding. (2) Under the tensile loading, the displacements of the spot welded plate models are in good agreement with those of the plate without spot welding when the array of the spot welding points is the same direction as the loading direction. (3) Under inplane bonding, the displacements of all the spot welded plate models except one spot plate model are in good agreement with the plate without spot welding.
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