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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of the Korean hydrogen and new energy society
Journal Basic Information
Journal DOI :
The Korean Hydrogen and New Energy Society
Editor in Chief :
Volume & Issues
Volume 15, Issue 4 - Dec 2004
Volume 15, Issue 3 - Sep 2004
Volume 15, Issue 2 - Jun 2004
Volume 15, Issue 1 - Mar 2004
Selecting the target year
Dyamic Modeling and Analysis of Air Supply System for Vehicular PEM Fuel Cell
Jang, HyunTak ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 3, 2004, Pages 175~186
In this paper, we developed the dynamic model of a fuel cell system suitable for controller design and system operation. The transient phenomena captured in the model include the flow characteristics and inertia dynamics of the compressor, the intake manifold filling dynamics, oxygen partial pressures and membrane humidity on the fuel cell voltage. In the simulations, we paid attention to the transient behavior of stack voltage and compressor pressure, stoichiometric ratio. Simulation results are presented to demonstrate the model capability. For load current following, stack voltage dynamic characteristics are plotted to understand the Electro-chemistry involved with the fuel cell system. Compressor pressure and stoichiometric ratio are strongly coupled, and independent parameters may interfere with each other, dynamic response, undershoot and overshoot.
A Study on the Pretreatment of Activated Sludge for Bio-hydrogen Production Process
Park, Dae-Won ; Kim, Dong-Kun ; Kim, Ji-Seong ; Park, Ho-Il ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 3, 2004, Pages 187~193
In this study, Anaerobic sewage sludge in a batch reactor operation at
was used as the seed to investigate the effect of pretreatments of waste activated sludge and to evaluate its hydrogen production potential by anaerobic fermentation. Various pretreatments including physical, chemical and biological means were conducted to utilize for substrate. As a result, SCODcr of alkali and mechanical treatment was 15 and 12 times enhanced, compared with a supernatant of activated sludge. And SCODcr was 2 time increase after re-treatment with biological hydrolysis. Those were shown that sequential hybridized treatment of sludge by chemical & biological methods to conform hydrogen production potential in bath experiments. When buffer solution was added to the activated sludge, hydrogen production potential increased as compare with no addition. Combination of alkali and mechanical treatment was higher in hydrogen production potential than other treatments.
Effects of Plate Pitch and Chevron Angle in a Plate Heat Exchanger on Thermal Energy Performance
Kang, Byung Ha ; Han, Sang Kyu ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 3, 2004, Pages 194~200
Thermal energy performance of a brazed plate heat exchanger has been evaluated experimentally. The effects of plate pitch as well as chevron angle of a plate heat exchanger on the heat transfer rate and pressure drop have been investigated in the wide range as mass flow rates in detail. This problem is of particular interest in the design of a plate heat exchanger. The results obtained indicate that both heat transfer rate and pressure drop are increased as mass flow rate is increased, as expected. It is also found that the heat transfer rate is increased with a decrease in the plate pitch while the heat transfer is decreased with a decrease in the chevron angle. Friction factor correlations are suggested based on the measured pressure drop and effectiveness of plate heat exchangers are also compared.
Study on the hydrogen production using the metal oxide (Cu-ferrite)
Park, Chu-Sik ; Seo, In-Tai ; Kim, Jung-Min ; Lee, Sang-Ho ; Hwang, Gap-Jin ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 3, 2004, Pages 201~207
Redox characteristics of metal oxide for hydrogen production by thermochemical water-splitting were investigated.
as a redox pair that had a different molar ratio of Cu and Fe were prepared by co-precipitation method. Hydrogen production consisted of water-splitting step and thermal reduction step was performed below 1200K. Redox characteristics of Cu-ferrites were studied using the thermal gravimetric analysis technique. Also, structure change of Cu-ferrite during thermal reduction was investigated using the high temperature controlled XRD. In results, oxygen release of Cu-ferrite during the thermal reduction was initiated at oxygen site combined with Cu. Consequently, oxygen release amount of Cu-ferrite was increased with increase of Cu molar ratio of Cu-ferrite. It was found that thermal reduction of Cu-ferrite was begun at
. It was confirmed that structure of Cu-ferrite was changed to metal and cation excess metal oxide during the thermal reduction step.
Reactivity and Attrition Resistance of Three Oxygen Carrier Particles for Chemical-Looping Combustor
Ryu, Ho-Jung ; Jin, Gyoung-Tae ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 3, 2004, Pages 208~219
To find a suitable oxygen carrier particle for a 50kW chemical-looping combustor, which was designed and installed to demonstrate continuous oxidation and reduction, three oxygen carrier particles(NiO/bentonite,
) were prepared. The reactivity and the attrition resistance of particles were measured and investigated by a thermo-gravimetrical analyzer and an attrition test apparatus respectively. From the viewpoints of oxygen transfer capacity, optimum reaction temperature(operating temperature range), reaction rate, carbon deposition rate, and attrition resistance, NiO/bentonite particle showed better performance than the other particles, therefore we selected NiO/bentonite particle as an optimum oxygen carrier particle.
How to Eliminate CO, CO
& Inert Gas -Possibility of Fuel Cell Application-
Lee, Taek-Hong ; Cheon, Young-Ki ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 3, 2004, Pages 220~227
The purpose of this paper is, based on the theoretical background of the principle of gas purification and absorption, and the absorbing ability of metals, to syudy the efficiency of gas purification of inorganic gases using Zr alloys, so as to contribute to the IT industry. To produce and distribute gas with high purity and ultra-high purity, different types of gas purifier are currently being used: distillation type, getter type, catalyst type, absorption at low-temperature type, and membrane separation equipment. From the different purification methods mentioned above, the getter type gas purifier is capable of not only high performance and capacity but also P.O.U(Point Of Use) method. The key of the getter type gas purifier is its efficiency of gas purification, which is the subject chosen for this study.
A Study on the Explosion Characteristics of Hydrogen
Oh, Kyu-hyung ; Rhie, Kwang-won ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 3, 2004, Pages 228~234
It was discussed about explosion danger of hydrogen gas experimentally that could be happen during the handling and using. Hydrogen concentration was varied from 10 to 60 vol% for get the explosion characteristics of hydrogen and 5 kinds of cylindrical vessel were used to find the explosion characteristics of hydrogen according to the vessel volume. Initial pressure of hydrogen-air mixture was varied from 0.6 to 2 kg/cm2. Based on the experiment, explosion pressure was most high near the 30vol% of hydrogen and explosion pressure was increased slightly according to the increase of vessel volume but explosion pressure rise rate was decreased. Explosion pressure was increased linearly proportional to the initial pressure of gas mixture.
Fabrication and Evaluations of Hydrogenation Properties of TiH
-Al agents on Aluminum Foam Alloy
Hong, T.-W. ; Cho, G.-W. ; Kweon, S.-Y. ; Kim, I.-H. ; Lee, J.-I. ; Ur, S.-C. ; Lee, Y.-G. ; Ryu, S.-L. ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 3, 2004, Pages 235~243
A number of potential applications of aluminum foams are being identified and renewed interest in these engineering materials is also reflected by several current research projects. One of the key issues for industrial exploitation of aluminum foams is the development of cost-effective manufacturing strategies facilitating, preferably, net shape production of foams with controlled porosity and cell size, and minimized structural imperfection. Especially, melt route to aluminum foam production based on the foaming agents offer attraction of low cost and the potential for good microstructure. The present paper is focused mainly on foaming agents of melt-foam aluminum such as
mixture. For the purpose of economical manufacturing, we are proposed to hydrogen induced mechanical alloying (HIMA) process. Thermo-physical properties of particles synthesized are compared with conventional methods. Specimens synthesized are characterized by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), thermo- gravimetry-differential scanning calorymetry (TG-DSC), pressure-composition-isotherm. (PCI).
A Study of Partial Oxidation of Methane by Pd Catalyst - Effects of Reaction Temperature -
Lee, Taek-Hong ; Mun, Yeong-Hwan ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 3, 2004, Pages 244~249
Pd catalyst have been used in hydrogenation, oxidation, and low temperature combustion reaction. Recently, it has been candidated as a possible reagents in the partial oxidation of methanol reformers of the fuel cell. Pd catalysts, even though it is very precious and expensive, catalytic functioning is good, but it still need to be improved in the matter of durability and low catalytic activity after calcination. In this study, we synthesize the improved Pd catalyst and study their chemical functioning.
Change of Hydriding Properties of Gravity Cast Mg-Ni Alloys with Ni Content
Yim, C.D. ; Moon, Y.M. ; You, B.S. ; Na, Yeong-Sang ; Bae, Jong-Su ;
Transactions of the Korean hydrogen and new energy society, volume 15, issue 3, 2004, Pages 250~256
Magnesium and its alloys have the high potential as hydrogen storage materials because of their highest hydrogen storage capacity, low density and abundant resources. But poor kinetic properties of hydriding and dehydriding and high working temperature have limited their practical applications. In this study, the Mg-Ni binary alloys with different amount of Ni were produced by gravity casting and characterized in order to investigate the relationship between the microstructures and hydriding properties. The maximum hydrogen absorption capacity decreased, but the absorption kinetics increased with Ni content. The difference in the absorption kinetics was resulted from the differences in the sort and shape of primary solid phases and eutectic microstructure.