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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 21, Issue 6 - Dec 2010
Volume 21, Issue 5 - Oct 2010
Volume 21, Issue 4 - Aug 2010
Volume 21, Issue 3 - Jun 2010
Volume 21, Issue 2 - Apr 2010
Volume 21, Issue 1 - Feb 2010
Selecting the target year
Numerical Study of Hydrogen Absorption in a Metal Hydride Hydrogen Storage Vessel
Nam, Jin-Moo ; Kang, Kyung-Mun ; Ju, Hyun-Chul ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 249~257
In this paper, a three-dimensional hydrogen absorption model is developed to precisely study hydrogen absorption reaction and resultant heat and mass transport phenomena in metal hydride hydrogen storage vessels. The 3D model is first experimentally validated against the temperature evolution data available in the literature. In addition to model validation, the detailed simulation results shows that at the initial absorption stage, the vessel temperature and H/M ratio distributions are uniform throughout the entire vessel, indicating that the hydrogen absorption is so efficient during the early hydriding process and thus local cooling effect is not influential. On the other hand, nonuniform distributions are predicted at the latter absorption stage, which is mainly due to different degrees of cooling between the vessel wall and core regions. This numerical study provides the fundamental understanding of detailed heat and mass transfer phenomena during hydrogen absorption process and further indicates that efficient design of storage vessel and cooling system is critical to achieve fast hydrogen charging and high hydrogen storage efficiency.
Numerical Studies of Cell Temperature Distribution in MCFC Stack According to Electrical Loads
Kim, Do-Hyung ; Kim, Beom-Joo ; Lee, Jung-Hyun ; Kang, Seung-Won ; Lim, Hee-Chun ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 258~263
A numerical stack model has been developed to predict the temperature at a constant-load operation of molten carbonate fuel cell stacks. For the validity of the model, the simulated results with several boundary conditions were compared in the cell temperature data obtained from 75 kW class MCFC stack operation. It was shown that the simulated results with the existing boundary condition, which the stack outlet temperature was fixed at
, didn't match well with the measured data. On the other hand, the stack model with the outlet temperature modified by the outlet manifold temperature measured from the stack under several electric loads was found to explain the measured cell temperature distribution well. The results show that the model can be used to predict the cell temperature distribution in the stacks by the measurement of the manifold outlet temperature.
Fabrications and Evaluations of Hydrogen Permeation on TIN-M(Co, NI) Composite Membrane
Kim, Kyeong-Il ; Yoo, Sung-Woong ; Hong, Tae-Whan ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 264~270
Recently, the most promising methods for high purity hydrogen production are membranes separation such as polymer, metal, ceramic and composites. It is well known that Pd and Pd-alloys membranes have excellent properties for hydrogen separation. However, it has hydrogen embrittlement and high cost for practical applications. Therefore, most scientists have studied new materials instead of Pd and Pd-alloys. On the other hand, TiN powders are great in resistance to acids and chemically stable under high operating temperature. In order to get specimens for hydrogen permeation, the TiN powders synthesized were consolidated together with Co, Ni powders by hot press sintering (HPS). During the consolidation of powders at HPS, heating rate was 10 K/min and the pressure was 10 MPa. It was characterized by XRD, SEM. Also, we estimated the hydrogen permeability by Sievert's type hydrogen permeation membrane equipment.
-NI Composite Membrane for Hydrogen Separation by Aerosol Deposition Method
Park, Young-Soo ; Choi, Jin-Sub ; Byoun, Myoung-Sub ; Kim, Jin-Ho ; Hwang, Kwang-Taek ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 271~277
oxide, showing high protonic conductivity at high temperatures and good chemical stability with
are referred to as hydrogen separation membrane. For high efficiency of hydrogen separation (
flux and selectivity) and low fabrication cost, ultimate thin and dense BZY-Ni layer has to be coated on a porous substrate such as
. Aerosol depostion (AD) process is a novel technique to grow ceramic film with high density and nano-crystal structure at room-temperature, and may be applicable to the fabrication process of AD integration ceramic layer effectively. XRD, SEM, X-ray mapping measurements were conducted in order to analyze the characteristics of BZY-Ni membrane fabricated by AD process. it is observed that it is homogeneous distribution for BZY-Ni. The result of
permeation rate suggests that BZY-Ni composite is higher than BZY.
The Role of Oxygen in Bunsen Reaction Section of Sulfur-Iodine Hydrogen Production Process
Hong, Dong-Woo ; Kim, Hyo-Sub ; Kim, Young-Ho ; Park, Chu-Sik ; Bae, Ki-Kwang ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 278~285
The Sulfur-Iodine (SI) thermochemical hydrogen production process of a closed cycle consists of three sections, which are so called the Bunsen reaction section, the
decomposition section and the HI decomposition section. To identify the role of oxygen that can be supplied to the Bunsen reaction section via the
decomposition section, Bunsen reactions with a
mixture as feed gases were carried out using a stirred reactor in the presence of
mixture. As the results, the amounts of
unreacted under the feed of mixture gases were higher than those under the feed of
gas only, and the amount of HI produced was relatively decreased. The results of Bunsen reaction using
mixture were similar to those using
mixture. It may be concluded that an oxygen in
mixture has a role as a carrier gas like a nitrogen in
mixture. The effects of oxygen were decreased with increasing temperature and decreasing oxygen content in
The Efficiency Prediction for Plate Type Steam Reformer with Shape Change of Combustion Chamber
Kim, Hun-Ju ; Lee, Ji-Hong ; Lee, Myeong-Yong ; Lee, Sang-Seok ; Lee, Do-Hyung ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 286~294
According to the propagation of fuel cell system, the importance of that system efficiency is being magnified. Thus, the efficiency improvement of reformer which is the important part of fuel cell system will be required. In structural aspect, the reformer is classified into cylindrical and plate type. Plate type reformer features better maintenance and space efficiency compared with cylindrical type. In this study, we changed the shape of combustion chamber to improve the reforming efficiency. And then we performed the CFD simulation to predict the spacial distribution of temperature. Analysis cased contains with baffles, fins, baffles and fins, and without those. In case of only with-baffle, temperature distributions were uneven because the high temperature stream was concentrated near the baffle end. In case of with-fin, the temperature distributions were relatively even than other cases.
A Study on Performance Improvement of PEMFC Using Wire Mesh Cell Structure
Jin, Sang-Mun ; Beack, Suk-Min ; Heo, Seong-Il ; Yang, Yoo-Chang ; Kim, Sae-Hoon ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 295~300
Metal bipolar plate applied to Polymer Electrolyte Membrane Fuel Cell is getting most attractive due to their good feasibility of mass production and low cost. But it is one of the immediate causes of performance decline because it is difficult to reduce channel pitch of metal bipolar plate. In this study, mesh was inserted in between bipolar plate and GDL to obtain uniform contact pressure without reducing channel pitch. The section measuring and performance test were carried out to confirm the mesh structure distributes contact pressure equally in reacting area. The performance of 3 type mesh structures developed in this study were higher than the normal cell at all over the current range. Especially, it showed that the mesh cell performance was increased and pressure drop was decreased with diminishing mesh gap size. The Mesh structure was more sensitive to humidification and contact pressure change than the normal cell.
Study on Photocatalytic Cr(VI) Reduction with Metal Deposited Anodized
Heo, Ah-Young ; Lee, Chang-Ha ; Park, Min-Sung ; Shim, Eun-Jung ; Yoon, Jae-Kyung ; Joo, Hyunk-Ku ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 301~306
The present work is performed to photocatalytically reduce Cr(VI) by means of metal deposited anodized
tubes, which are prepared by anodization of Ti foil followed by metal deposition. Stably immobilized photo-reactive materials are favored in the field of detoxification in a conventional aqueous medium, preventing gradual loss of efficiency and process malfunction due to detachment of the materials. The prepared samples are characterized by SEM, TEM, EDAX, and photocurrent. The metal deposited-
electrode shows higher efficiency for Cr(VI) reduction (ca. 20%) and higher ability for adsorption (4~5 times) than pure one.
Synthesis and Characterization of Poly(ether Sulfone)s Containing Bisphenol-TP for PEMFC
Lim, Young-Don ; Seo, Dong-Wan ; Lee, Soon-Ho ; Islam, Monirul ; Kang, Da-Lib ; Kim, Whan-Gi ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 307~312
Poly (ether sulfone)s with Bisphenol-TP and Bisphenol-AF
were prepared with Bisphenol-TP <4,4-dihydroxy tetraphenyl methane>, 4-Fluorophenyl sulfone, and Bisphenol-AF <4,4-(hexafluoroisopropylidene) diphenol> using Potassium carbonate in Sulfolane
. Sulfonated PBTP-AF were obtained by reaction of Chlorosulfuric acid with copolymers. A series of copolymers were studied by
-NMR spectroscopy, Differential Scanning Calorimeter (DSC), and Thermo Gravimetric Analysis (TGA). Sorption experiments were conducted to observe the interaction of polymers with water and methanol.
Water Repellent Coating of Carbon Cloth with Different Size PTFE and Gas Permeabilities
Jeon, Hyeon ; Cho, Tae-Hwan ; Choi, Weon-Kyung ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 313~320
Carbon cloth was impregnated into PTFE emulsion. PTFE is a fluoropolymer used as a coating material in various fields due to its hydrophobicity and excellent mechanical properties. In this study, PTFE emulsion was prepared different particle size of 5~500 nm and
. FE-SEM and FT-IR spectroscopy were used microscopic observation and investigation of chemical structure change after PTFE coating. Mass variations, gas permeability and water contact angles were analyzed to determine a GDL performance of PTFE coated carbon cloth. PTFE coated carbon cloth show different mass increase according as PTFE concentration and the number of coating times. Water contact angle of PTFE coated carbon cloth was not effected by size of PTFE particle and the number of coating time; meanwhile, gas permeability was rapidly changed at carbon cloth coated by emulsion with size of
A Study for Development of Compact Powerpack used Hydrogen
Kim, Nam-Yuer ; Kim, Gang-Chul ; Lim, Ock-Taeck ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 321~327
Current rechargeable battery cannot provide high energy density and the operational durations required. But linear engine/generators provide high energy density for portable power applications because fuel is more high density. In this paper, we suggest that basic design of powerpack using linear engine for assisting power output. Efficiency is relatively high because linear engine don't have crank mechanism compared with rotary engine. We made prototype engine and had experiments to know moving characteristic about the Linear Engine. It was possible to operate velocity at 50 Hz at the firing and pressure in cylinder was 16bar.
Char Gasification Model Including the Effects of Pore Structure and Solid Reaction Product
Chi, Jun-Hwa ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 328~339
A new gasification model for coal char was developed considering the effects of pore structure and solid reaction product (ash) and compared with conventional models. Among various parameters reflecting microscopic pore structure, initial pore surface per unit volume of char was found to have the largest effect on carbon conversions. Reaction studies showed that the proposed model can predict carbon conversion more accurately over a broader range of reaction degree compared to the conventional models. Therefore the model proposed in this study would be useful for the design of pilot or commercial scale gasifiers.
Evaluation of Hydrogen Embrittlement Behavior in INCONEL Alloy 617 by Small Punch Test
Seo, Hyon-Uk ; Ma, Young-Hwa ; Yoon, Kee-Bong ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 340~345
For the conversion into hydrogen society, not only studying facilities of hydrogen production, storage, transportation and charging system but also developing technique of ensuring safety are essentially needed. Hence, for the first step of that, evaluated the hydrogen embrittlement of Inconel alloy 617, Ni-based super heat-resisting alloy, by small punch test. Prepared the various specimens through changing electrochemical charging time and measured the toughness degradation of the specimens by small-punch test. The analysis of hydrogen embrittlement behavior were carried out by investigating the fractured surface of specimens. This study has significance on revealing mechanism of hydrogen embrittlement behavior and the factor affecting hydrogen embrittlement in the future study.
The Strategy Plans for Practical use of Hydrogen Fueled Vehicles in Domestic
Lee, Kwang-Ju ; Lee, Jong-Tae ; Yong, Gee-Joong ;
Transactions of the Korean hydrogen and new energy society, volume 21, issue 4, 2010, Pages 346~353
Hydrogen fueled vehicle was evaluated as one of the next-generation technology that will be able to solve the global warming, depletion of fossil fuel and etc. The practical use of hydrogen fueled vehicle, nevertheless, is being delayed more than expected schedule due to various causes. In order to promote the dissemination of hydrogen fueled vehicle, development status and obstacle factors of practical use for hydrogen fueled vehicles were reviewed and the strategy plans for dissemination promotion were proposed. Hydrogen fueled vehicles are included the hydrogen fuel cell, neat and enriched hydrogen fueled engines. The technicalness, economy, safety, cognizance, system, support and etc were considered in the strategy plans.