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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 19, Issue 6 - Dec 2008
Volume 19, Issue 5 - Oct 2008
Volume 19, Issue 4 - Aug 2008
Volume 19, Issue 3 - Jun 2008
Volume 19, Issue 2 - Apr 2008
Volume 19, Issue 1 - Feb 2008
Selecting the target year
The Evaluation of Reliability for the High Pressure Hydrogen Storage System of Fuel Cell Vehicle
Jang, Gyu-Jin ; Choi, Young-Min ; Ahn, Byung-Ki ; Lim, Tae-Won ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 266~275
The performance improvement of each part for durability, safety and cost of high pressure storage system for fuel cell vehicle has been focused so far. However, for the mass production of fuel cell vehicle, it is necessary to evaluate durability and safety in system module and vehicle level. The test procedure to evaluate vibration and collision safety of high pressure hydrogen storage system for the fuel cell vehicle is established and its reliability is verified.
Combustion Characteristics of Hydrogen/Methane gas in Pre-mixed Swirl Flame
Kim, Han-Seok ; Lee, Young-Duk ; Choi, Won-Seok ; Ahn, Kook-Young ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 276~282
The effects of hydrogen enrichment to methane have been investigated with swirl-stabilized premixed hydrogen-enriched methane flame in a laboratory-scale pre-mixed combustor. The hydrogen-enriched methane fuel and air were mixed in a pre-mixer and introduced to the combustor through different degrees of swirl vanes. The flame characteristics were examined for different amount of hydrogen addition to the methane fuel and different swirl strengths. The hydrogen addition effects and swirl intensity on the combustion characteristics of pre-mixed methane flames were examined using micro-thermocouple, particle image velocity meter (PIV) and chemiluminescence techniques to provide information about flow field. The results show that the flame area increases at upstream of reaction zone because of increase in ignition energy from recirculation flow for increase in swirl intensity. The flame area is also increased at the downstream zone by recirculation flow because of increase in swirl intensity which results in higher centrifugal force. The higher combustibility of hydrogen makes reaction faster, raises the temperature of reaction zone and expands the reaction zone, consequently recirculation flow to reaction zone is reduced. The temperature of reaction zone increases with hydrogen addition even though the adiabatic flame temperature of the mixture gas decreases with increase in the amount of hydrogen addition in this experiment condition because the higher combustibility of hydrogen reduces the cooler recirculation flow to the reaction zone.
Performance of the Small PEMFC according to Cathode
Lee, Se-Won ; Lee, Kang-In ; Park, Min-Soo ; Chu, Chong-Nam ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 283~290
In this paper, experiments with an air-breathing proton exchange membrane fuel cell (PEMFC) for mobile devices were carried out according to cathode conditions. These conditions are defined by the cathode flow field plate type (the channel type, the open type) and the cathode surface direction. Single-cell and 6-cell stack were used in the experiments. The experimental results showed that the open-type cathode flow field plate gave a better performance than the small channel type. In the experiments related to the direction of the slits on the cathode flow field plate, the horizontal slit cell was better than the vertical one. With respect to the cathode surface direction, when the cathode surface is placed in the direction normal to the ground, the PEMFC generated more stable power in the mass transport loss region. Since stable power in the mass transport region is closely related to the air supply, computational fluid dynamics (CFD) analysis for air-breathing PEMFC of different cathode surface directions was performed.
Effect of CO in Anode Fuel on the Performance of Polymer Electrolyte Membrane Fuel Cell
Kwon, Jun-Taek ; Kim, Jun-Bum ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 291~298
Carbon monoxide(CO) is one of the contamination source in reformed hydrogen fuel with an influence on performance of polymer electrolyte membrane fuel cell(PEMFC). The studies of CO injection presented here give information about poisoning and recovery processes. The aim of this research is to investigate cell performance decline due to carbon monoxide impurity in hydrogen. Performance of PEM fuel cell was investigated using current vs. potential experiment, long time(10 hours) test, cyclic feeding test and electrochemical impedance spectra. The concentrations of carbon monoxide were changed up to 10 ppm. Performance degradation due to carbon monoxide contamination in anode fuel was observed at high concentration of carbon monoxide. The CO gas showed influence on the charge transfer reaction. The performance recovery was confirmed in long time test when pure hydrogen was provided for 1 hour after carbon monoxide had been supplied. The result of this study could be used as a basis of various reformation process design and fuel quality determination.
Thermal Decomposition of Ammonia Borane for
Lee, Ji-Hong ; Lee, Hyun-Joo ; Ahn, Byoung-Sung ; Kim, Chang-Soo ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 299~304
Thermal decomposition of Ammonia Borane have been investigated with various analytical methods including TGA, TP-MS, DSC. By-products such as aminoborane and borazine were identified during hydrogen release by TGA, TP-MS analysis.
release amount was measured at each temperature isothermally, which resulted in 7 wt%
release at 130
. Moreover, higher temperature enhanced hydrogen release kinetics leading to shortened induction period from 20 min at 95
to 0 min at 130
. Melting and decomposition at close temperature (4
difference) caused the formation of thin foam during hydrogen release. Suppression of by-products and thin foam formation during hydrogen release is suggested as critical issues to realize chemical hydrogen storage system with ammonia borane.
Particle Size and Reaction Temperature Effects on the Hydrolysis Reaction of Zinc in TGA (Thermo Gravimetric Analyzer)
Ahn, Seung-Hyuck ; Kang, Kyoung-Soo ; Kim, Chang-Hee ; Bae, Ki-Kwang ; Kim, Young-Ho ; Park, Chu-Sik ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 305~312
ZnO/Zn redox cycle is the one of the promising thermochemical cycles for hydrogen production via water splitting with high temperature heat source like a concentrated solar energy. This paper reports the particle size effect of Zinc on water splitting behavior. Water splitting reaction experiments were carried out at isothermal conditions of 350 and 400
in TGA (Thermo Gravimetric Analyzer) using four commercial Zinc powders (nano, <10
particle sizes). Before the experiments, average particle size of Zinc powders was analyzed by PSA (Particle Size Analysis). After the experiments, XRD (X-Ray Diffraction) and SEM (Scanning Electron Microscope) analyses were conducted on the samples. The experimental results showed that particle size had a effect on the conversion of Zinc to ZnO. Zinc conversion was increased, as the particle size decreased. Especially, the nano size particles were aggregated and the particle's morphology changed on the surface during hydrolysis reaction.
A Dynamic Simulation Model for the Operating Strategy Study of 1 kW PEMFC
Yu, Sang-Seok ; Lee, Young-Duk ; Hong, Dong-Jin ; Ahn, Kook-Young ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 313~321
Dynamics of the proton exchange membrane fuel cell is specially important when the system is frequently working on transient conditions. Even though the dynamics of proton exchange membrane fuel cell for residential power generation is less critical than that of PEMFC for transportation application, the system dynamics of PEMFC for RPG can be very important for daily start-up and stop. In particular, thermal management of the PEMFC for RPG is very important because the heat generation from electrochemical reaction is delivered to the home for hot water usages. Additionally, the thermal management is also very important for heat balance of the system and temperature control of the fuel cell. The objective of this study is to develop a dynamic system model for the study of PEMFC performance over various BOP options. Basic simulation results will be presented.
Economic Evaluation of Domestic Photobiological Hydrogen Production
Gim, Bong-Jin ; Kim, Jong-Wook ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 322~330
This paper deals with an economic evaluation of domestic photobiological hydrogen production. We evaluate the economic feasibility of domestic photobiological hydrogen production utilizing green algae and cyanobacteria. In addition, we make some sensitivity analysis of hydrogen production prices by changing the values of input factors such as the price of a photo-bioreactor and the value of solar to hydrogen efficiency. The estimated hydrogen production price of the two-step indirect biophotolysis was 12,099won/kg
. It is expected that the hydrogen production price by the two-step indirect biophotolysis can be reduced to 2,143won/kg
if the solar to hydrogen efficiency is increased to 10% and the price of a photo-bioreactor is decreased to $25/
. The two-step indirect biophotolysis is evaluated as uneconomical at this time, and we need to enhance the solar to hydrogen efficiency and to reduce the prices of the photo-bioreactor and system facilities.
Condensation Heat Transfer Characteristics of Hydrocarbon Refrigerants in Horizontal Tubes of 7.73 mm and 5.80 mm
Son, Chang-Hyo ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 331~339
Characterization of Aqueous Solution Pretreatment for Serpentine Used Carbondioxide Sequestration Material
Choi, Weon-Kyung ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 340~347
Dissolution process of serpentine in distilled water was systematically investigated for study on pre-treatment of serpentine which was a candidate material for carbon dioxide sequestration. The metallic ions(Ca, Si, Mg etc.) were dissolved in distilled water at ambient condition and their concentrations were changed with dissolution time. The precise evaluation of dissolution process for serpentine dissolved solvent was performed by ion conductivity and pH measurement. Serpentine dissolution in distilled water was evaluated as a stable pre-treatment process without changes of crystallographic structure and chemical structure changes.
Reduction Characteristics of Mass Produced Particle for Chemical-Looping Combustor with Different Fuels
Ryu, Ho-Jung ; Kim, Kyung-Su ; Lee, Seung-Yong ; Park, Yeong-Seong ; Park, Moon-Hee ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 348~358
Reduction reactivity and carbon deposition characteristics of mass produced oxygen carrier particle(OCN-650) have been investigated by using hydrogen, methane, syngas, and natural gas as fuels. For all fuels, the maximum conversion and oxygen transfer capacity increased as the temperature increase. The reduction rate and the oxygen transfer rate increased as the temperature increase for methane. However, those values showed maximum at 900
for hydrogen, syngas, and natural gas. To explain consistently the change of maximum conversion, reduction rate, oxygen transfer capacity, oxygen transfer rate and degree of carbon deposition for different fuels, new parameters such as reactive carbon contents and require oxygen per input gas were adopted.
Hydrogen Permeation Properties of
Amorphous Metallic Membrane
Lee, Dock-Young ; Kim, Yoon-Bae ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 4, 2008, Pages 359~366
Hydrogen as a high-quality and clean energy carrier has attracted renewed and ever-increasing attention around the world in recent years, mainly due to developments in fuel cells and environmental pressures including climate change issues. In this processes for hydrogen production from fossil fuels, separation and purification is a critical technology.
alloy ingots were prepared by arc-melting the mixture of pure metals in an Ar atmosphere. Melt-spun ribbons were produced by the single-roller melt-spinning technique in an Ar atmosphere. Amorphous structure and thermal behavior were characterized by XRD and DSC. The permeability of the
amorphous alloy membrane was characterized by hydrogen permeation experiments in the temperature range 623 to 773 K and pressure of 2 bars. The maximum hydrogen permeability was
at 773 K for the