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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 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
Flow visualization used PIV of hydrogen fueled free piston engine with uni-flow scavenging
Cho, H.W. ; Yoon, J.S. ; Lee, J.T. ; Lim, H.S. ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 3, 2008, Pages 182~188
In order to improve scavenging performance of free piston hydrogen fueled engine, this study estimate compatibility of uni-flow scavenging. The scavenging flow characteristics in the cylinder is investigated by flow visualization and PIV method. Consequently it has been found that the scavenging performance decreased with abnormal expansion of piston and delay of the exhaust valve opening timing. And the scavenging performance of exhaust valve located center in cylinder head is better than that of exhaust valve located side in cylinder head.
Redox reaction of Fe-based oxide mediums for hydrogen storage and release: cooperative effects of Rh, Ce and Zr additives
Lee, Dong-Hee ; Park, Chu-Sik ; Kim, Young-Ho ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 3, 2008, Pages 189~198
Cooperative effects of Rh, Ce and Zr added to Fe-based oxide mediums were investigated using temperature programmed redox reaction (TPR/TPO) and isothermal redox reaction in the view point of hydrogen storage and release. As the results of TPR/TPO, Rh was a sale additive to remarkably promote the redox reaction on the medium as evidenced by the lower highest peak temperature, even though its addition was to accelerate deactivation of the mediums due to sintering. On the other hand, Ce and Zr additives played an important role to suppress deactivation of the medium in repeated redox cycles. The medium co-added by Rh, Ce and Zr (FRCZ) exhibited synergistic performance in the repeated isothermal redox reaction, and the amount of hydrogen produced in the water splitting step at 623 K was highly maintained at ca.
during three repeated redox cycles.
Characteristics of Pt/C-based Catalysts for HI Decomposition in SI process
Kim, J.M. ; Kim, Y.H. ; Kang, K.S. ; Kim, C.H. ; Park, C.S. ; Bae, K.K. ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 3, 2008, Pages 199~208
HI decomposition was conducted using Pt/C-based catalysts with a fixed-bed reactor in the range of 573 K to 773 K. To examine the change of the characteristic properties of the catalysts,
adsorption analyser, a X-ray diffractometer(XRD), and a scanning electron microscopy(SEM) were used before and after the HI decomposition reaction. the effect of Pt loading on HI decomposition was investigated by
-TPD. HI conversion of all catalysts increased as decomposition temperature increased. The XRD analysis showed that the sizes of platinum particle became larger and agglomerated into a lump during the reaction. From
-TPD, it can be concluded that the cause for the increase in catalytic activity may be attributed to the basic sites of catalyst surface. The results of both b desorption and gasification reaction showed the restriction on the use of Pt/C-based catalyst.
Modeling and parametric studies of PEM fuel cell performance
Noh, Young-Woo ; Kim, Sae-Hoon ; Jeong, Kwi-Seong ; Son, Ik-Jae ; Han, Kook-Il ; Ahn, Byung-Ki ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 3, 2008, Pages 209~216
In the present study, a mathematical model has been formulated for the performance of polymer electrolyte fuel cells. Modify the concentration polarization equation using concentration coefficient that represents the characteristics of bipolar plate reactant distribution. The model predictions have been compared with experimental results and good agreement has been demonstrated for the cell polarization curves. The effects of operating parameters on the performance of fuel cells have been studied. Increases of operation pressure reduce the effect of temperature on the performance.
Studies on a Micro Reformer System with a Two-staged Microcombustor
Kim, Ki-Baek ; Lee, Jung-Hak ; Kwon, Oh-Chae ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 3, 2008, Pages 217~225
A new micro reformer system consisted of a micro reformer, a microcombustor and a micro evaporator was studied experimentally and computationally. In order to satisfy the primary requirements for designing the microcombustor integrated with a micro evaporator, i.e. stable burning in a small confinement and maximum heat transfer through a wall, the present microcombustor is simply cylindrical to be easily fabricated but two-staged (expanding downstream) to feasibly control ignition and stable burning. Results show that the aspect ratio and wall thickness of the microcombustor substantially affect ignition and thermal characteristics. For the optimized design conditions, a premixed microflame was easily ignited in the expanded second stage combustor, moved into the smaller first stage combustor, and finally stabilized therein. A micro reformer system integrated with a modified microcombustor based on the optimized design condition was fabricated. For a typical operating condition, the designed micro reformer system produced 22.3 sccm hydrogen (3.61 W in LHV) in an overall efficiency of 12%.
decomposition over Cu/Fe/
granules with controlled size for hydrogen production in SI thermochemical cycle
Yoo, Kye-Sang ; Jung, Kwang-Deog ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 3, 2008, Pages 226~231
granules with various sizes have been prepared by a combination of sol-gel and oil drop method for the use in sulfur trioxide decomposition, a subcycle in thermochemical sulfur-iodine cycle to split water in the hydrogen and oxygen. The size of composite granules have been mainly changed by the flow-rate of the gel mixture before dropping in the synthesis. The structural properties of the samples were comparable with granule size. In the reaction, the catalytic activity was enhanced by decreasing size in the entire reaction temperature ranges.
The effect of PEMFC stack performance at air supply condition
Park, Chang-Kwon ; Oh, Byeong-Soo ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 3, 2008, Pages 232~238
Research has been proceeded on fuel cell which is fueled by hydrogen. Polymer electrolyte membrane fuel cell (PEMFC) is promising power source due to high power density, simple construction and operation at low temperature. But it has problems such as high cost, temperature dependent performance. These problems could be solved by experiment which is useful for analysis and optimization of fuel cell performance and heat management. In this paper, when hydrogen flows constantly at the stoichiometry of
, the performance of the fuel cell stack was increased and the voltage difference between each cells was decreased according to the increase of air stoichiometry by 2.0, 2.5, 3.0. Therefore, the control of air flow rate in the same gas channel is important to get higher performance. Purpose of this research is to expect operation temperature, flow rate, performance and mass transportation through experiment and to help actual manufacture of PEM fuel cell stack.
A Study on Methodology of Assessment for Hydrogen Explosion in Hydrogen Production Facility
Jae, Moo-Sung ; Jun, Gun-Hyo ; Lee, Hyun-Woo ; Lee, Won-Jae ; Han, Seok-Jung ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 3, 2008, Pages 239~247
Hydrogen production facility using very high temperature gas cooled reactor lies in situation of high temperature and corrosion which makes hydrogen release easily. In that case of hydrogen release, there lies a danger of explosion. However, from the point of thermal-hydraulics view, the long distance of them makes lower efficiency result. In this study, therefore, outlines of hydrogen production using nuclear energy are researched. Several methods for analyzing the effects of hydrogen explosion upon high temperature gas cooled reactor are reviewed. Reliability physics model which is appropriate for assessment is used. Using this model, leakage probability, rupture probability and structure failure probability of very high temperature gas cooled reactor are evaluated and classified by detonation volume and distance. Also based on standard safety criteria which is value of
, safety distance between the very high temperature gas cooled reactor and the hydrogen production facility is calculated.
Technology Trend for Non-carbon Nanomaterials Hydrogen Storage by the Patent Analysis
Lee, Jin-Bae ; Kang, Kyung-Seok ; Han, Hye-Jeong ; Kim, Jong-Wook ; Kim, Hae-Jin ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 3, 2008, Pages 248~259
There are several well-known materials for the hydrogen storage such as metallic alloy, carbon nanomaterials, non-carbon nanomaterials, and compounds etc. Efficient and inexpensive hydrogen storage methods are an essential prerequisite for the utilization of hydrogen, one of the new and clean energy sources. Many researches have been widely performed for the hydrogen storage techniques and materials to improve the high storage capacity and stability. In this paper, the patents concerning the non-carbon nanomaterial hydrogen storage method were collected and analyzed. The search range was limited in the open patents of Korea(KR), Japan(JP), USA(US) and European Union(EP) from 1996 to 2007. Patents were collected by using key-words searching and filtered by filtering criteria. The trends of the patents was analyzed by the years, countries, companies. and technologies.
Renewable Energy Policy in the UK - with Focus on Biomass
Ryu, Chang-Kook ;
Transactions of the Korean hydrogen and new energy society, volume 19, issue 3, 2008, Pages 260~265
As one of renewable energy sources, biomass is playing a major role in reducing the greenhouse gas emission in the UK. The country currently produces about 4.5% (18.1TWh in 2006) of the total electricity generation from renewables, where biomass-based sources accounts for 50% of the amount and the remainder mostly from hydro and windpower. In 2007, the UK government has announced its new energy policy through the Energy White Paper, which includes an ambitious national target of 60% cuts in carbon emission by 2050. Complementary strategic plans in key renewable energy technologies accompanied the Energy White Paper, including biomass strategy, waste strategy and low carbon transportation strategy. This paper summarizes the current status and policy of UK for renewable energy production with focus on the use of biomass and bioenergy.