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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 26, Issue 6 - Dec 2015
Volume 26, Issue 5 - Oct 2015
Volume 26, Issue 4 - Aug 2015
Volume 26, Issue 3 - Jun 2015
Volume 26, Issue 2 - Apr 2015
Volume 26, Issue 1 - Feb 2015
Selecting the target year
Characteristics of Hydrogen Iodide Decomposition using Alumina-Supported Ni Based Catalyst
KIM, JI HYE ; PARK, CHU SIK ; KIM, CHANG HEE ; KANG, KYOUNG SOO ; JEONG, SEONG UK ; CHO, WON CHUL ; KIM, YOUNG HO ; BAE, KI KWANG ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 507~515
DOI : 10.7316/KHNES.2015.26.6.507
HI decomposition reaction requires a catalyst for the efficient production of hydrogen as a key reaction for hydrogen production in sulfur-iodine thermochemical water-splitting (SI) cycle. As a catalyst used in the reaction, the performance of platinum catalyst is excellent. While, the platinum catalyst is not economical. Therefore, studies of a nickel catalyst that could replace platinum have been carried out. In this study, the characteristics of the catalytic HI decomposition on the amount of loaded nickel (Ni = 0.1, 0.5, 1, 3, 5, 10 wt%) were investigated. As the supported Ni amount increased up to 3 wt%, HI decomposition was found to increase in linear proportion. However, the conversion of
catalyst loaded above 3 wt% was not linear. It was thought that the different HI decomposition characteristics was caused in the size and metal dispersion of Ni particles of catalyst. The physical property of catalyst before and after HI decomposition reaction was characterized by BET, chemisorption, XRD and SEM analysis.
The Effect of Y at Ni-YSZ Catalysts for the Application to the Process of Methane Chemical-Looping Reforming
KIM, HEESEON ; JEON, YUKWON ; HWANG, JUSOON ; SONG, SOONHO ; SHUL, YONG-GUN ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 516~523
DOI : 10.7316/KHNES.2015.26.6.516
Nickel based oxygen transfer materials supported on two different YSZs were tested to evaluate their performance in methane chemical-looping reforming. The oxygen transfer materials of YSZs were selected with different amount of the doped yittrium in the
structure. The yittrium of 8 mol% stabilized the zirconia oxide to a cubic structure compare to the 3 mol% doping, which is known to be a good for oxygen transfer. Various nickel amounts (16wt.%, 32wt.%, 48wt.%) were loaded on the selected supports. The nickel amount of 32% shows the optimized catalyst structure with good physical properties and reducibility from the XRD, BET and H2-TPR analysis, especially when the support of 8YSZ was used. From the methane chemical-looping reforming, hydrogen was produced by methane decomposition catalyzed by Ni on both YSZs. Comparing two YSZ supports of 3YSZ and 8YSZ during the cycling tests, the catalyst with 8YSZ (Ni 32%) exhibits not only the higher methane conversion and hydrogen production but also a faster reaction rate reaching to the stable point.
Synthesis and Characterization of Covalently Cross-Linked SPEEK/Cs-substituted MoSiA/Ceria Composite Membranes with MoSiA for Water Electrolysis
SEO, HYUN ; SONG, YU-RI ; OH, YUN-SUN ; MOON, SANG-BONG ; CHUNG, JANG-HOON ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 524~531
DOI : 10.7316/KHNES.2015.26.6.524
To improve the electrochemical and mechanical characteristics, engineering plastic of the sulfonated polyether ether ketone (SPEEK) as polymer matrix was prepared in the sulfonation reaction of polyether ether ketone (PEEK). The SPEEK organic-inorganic blended composite membranes were prepared by sol-gel casting method. It was loaded with the highly dispersed ceria and cesium-substituted molybdosilicic acid (Cs-MoSiA) and 1,4-diiodobutane which was cross-linking agent contents of
. Cs-MoSiA was added to increase proton conductivity. Ceria (
) was used as a free radical scavenger which degrade the membrane in polymer electrolyte membrane water elctrolysis (PEMWE). In conclusion, CL-SPEEK/Cs-MoSiA/Ceria 1% composite membrane showed high proton conductivity 0.2104 S/cm at
which was better than Nafion 117 membrane.
Effects of Process Variables on the Growth of Dendrite in the Electrochemical Alane(AlH
) Production Process
KIM, HYOSUB ; PARK, HYUNGYU ; PARK, CHUSIK ; BAE, KIKWANG ; KIM, YOUNGHO ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 532~540
DOI : 10.7316/KHNES.2015.26.6.532
Electrochemical alane (
) production process can be provided as a synthesis route which close a reversible cycle. In this study, growth inhibition of dendrite as key issues in this process was investigated. Main cause of dendrite growth was because Al fine powder separated in consumption process of Al electrode was moved to Pd electrode. In an effort to avoid this, use of glass block with uniform holes was the most effective to inhibit the amount of dendrite to that of
. Furthermore, effects of Al electrode (anode) type and electrolyte concentration were investigated and the optimal condition for inhibiting dendrite formation was proposed.
Characteristics of a Hydrogen Isotope Storage and Accountancy System
KIM, YEANJIN ; JUNG, KWANGJIN ; GOO, DAESEO ; PARK, JONGCHUL ; JEON, MIN-GU ; YUN, SEI-HUN ; CHUNG, HONGSUK ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 541~546
DOI : 10.7316/KHNES.2015.26.6.541
Global energy shortage problem is expected to increase driven by strong energy demand growth from developing countries. Nuclear fusion power offers the prospect of an almost infinite source of energy for future generations. Hydrogen isotope storage and delivery system is a important subsystem of a nuclear fusion fuel cycle. Metal hydride is a method of the high-density storage of hydrogen isotope. For the safety storage of hydrogen isotope, depleted uranium (DU) has been widely proposed. But DU needs a safe test because It is a radioactive substance. The authors studied a small-scale DU bed and a medium-scale DU bed for the safety test. And then we made a large-scale DU bed and stored hydrogen isotopes in the bed. Before the hydriding/dehydriding, we tested it's heating and cooling properties and carried out an activation procedure. As a result, Reaction rate of DU-
is more rapid than the other metal hydride ZrCo. Through the successful storage result of our large bed, the development possibility of the hydrogen isotope storage technology seems promising.
Manufacturing Process Improvement of Electrode for PEMFC
PARK, SEOK JUNG ; LEE, JAE SEUNG ; LEE, KI SUB ; ROH, BUM WOOK ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 547~553
DOI : 10.7316/KHNES.2015.26.6.547
For commercialization of fuel cell electric vehicles, one of the key objectives is to reduce cost of full stack assembly. Regarding Membrane Electrode Assembly, the major issue is to improve fuel cell activation process in the initial Hydrogen Oxidation Reaction and Oxygen Reduction Reaction. In this research, the VD (Vacuum Drying) process has been developed for improvement of activation process. The VD condition is developed by controlling the temperature and degree of vacuum to remove the remaining solvent of electrode. Consequently, the electrode applied to VD process showed the low characteristics such as 3.5% of remaining solvent content and the improved efficiency such as 15% of activation process speed.
A Study on Performance of Polymer Electrolyte Membrane Fuel Cell Using Metal Foam
KIM, MYO-EUN ; KIM, CHANG-SOO ; SOHN, YOUNG-JUN ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 554~559
DOI : 10.7316/KHNES.2015.26.6.554
Single cell of PEMFC (polymer electrolyte membrane fuel cell) is composed of bipolar plates, gasket, GDL and the MEA. Bipolar plate's function is the collecting electricity, helping oxygen/hydrogen gas diffuse evenly and draining the water and heat. In this work, we have conducted experiments to low contact resistance and improve the performance of a
single cell by using metal forms. We have following experimental cases: 1) Conventional graphite serpentine channel bipolar plate; 2) Channel-less bipolar plate with nickel(Ni) based metal foam which coated by various materials. We focused the difference in contact resistance and performance of the single cell with metal foam depending on various coating materials. The experimental results show the similar performance of single cells between with serpentine channel bipolar plates and with channel-less bipolar plate using metal foams. In addition, single cell with metal foam shows potential to higher performance than conventional channel.
An Analysis on the Effects of EGR to Extend Operation Region for a HCCI Hydrogen Engine
LEE, KEONSIK ; KIM, JINGU ; BYUN, CHANGHEE ; LEE, JONGTAI ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 560~566
DOI : 10.7316/KHNES.2015.26.6.560
HCCI (Homogeneous Charge Compression Ignition) hydrogen engine has relatively narrower operation range caused by knock occurrence due to the rapid pressure rising by using higher compression ratio. In this study, EGR as one of the countermeasure methods is considered to extend operation range of HCCI hydrogen engine. Also, the effects of hydrogen EGR are compared with the effects of EGR using hydrocarbon fuel. Hydrocarbon EGR is carried out by adding carbon dioxide to exhaust gas of HCCI hydrogen engine. As the results, EGR has positive effects on a HCCI hydrogen engine in reducing rate of pressure rise as same as the other engines used hydrocarbon fuels. However, the effects of hydrogen EGR are better than those of hydrocarbon EGR in decreasing minimum compression ratio and rate of pressure rise. When applying EGR to HCCI hydrogen engine by 20% rate, the rate of pressure rise decreases by 58% and it results in about 48% increase of the operation range in terms of supply energy.
A Study on Evaluating the Selection of Low Rank Coal Gasifier
KIM, CHEOLOONG ; LIM, HO ; KIM, RYANGGYOON ; SONG, JUHUN ; JEON, CHUNGHWAN ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 567~580
DOI : 10.7316/KHNES.2015.26.6.567
In order to select an optimum gasifier for specific low rank coal, evaluation elements were studied by analyzing characteristics of low rank coal compared with those of high rank coal and the effects of each gasifier type in accordance with the characteristics. And syngas composition calculation model was made on the basis of thermochemical equilibrium to quantify some of the evaluation elements. And then the suitable gasifier was selected for a kind of Indonesian low rank coal through this syngas composition calculation model and the evaluation elements of selecting gasifier.
Comparison of Viscosity Measurement of a Liquid Carbon Dioxide Used for a High-Pressure Coal Gasifier
KIM, KANGWOOK ; KIM, CHANGYEON ; KIM, HAKDUCK ; SONG, JUHUN ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 581~589
DOI : 10.7316/KHNES.2015.26.6.581
In this study, the viscosity of a liquid carbon dioxide (
) that can potentially be used in a wet feed coal gasifier was evaluated. A pressurized capillary viscometer was employed to obtain the viscosity data of
using two different methods. During the first method, the measurements were conducted under quasi-steady and high pressure flow conditions where two-phase flow was greatly minimized. The viscosity of
was determined using turbulent friction relationship. At the second flow condition where unsteady flow is induced, the viscosity of
was measured using the half-time pressure decay data and was further compared with values calculated by the first method.
Characteristics of Thermodynamic Performance of Heat Exchanger in Organic Rankine Cycle Depending on Pinch Temperature Difference
KIM, KYOUNG HOON ; JUNG, YOUNG GUAN ; PARK, SANG HEE ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 590~599
DOI : 10.7316/KHNES.2015.26.6.590
In this paper a performance analysis is carried out based on the first and second laws of thermodynamics for heat exchanger in organic Rankine cycle (ORC) for the recovery of low-temperature finite thermal energy source. In the analysis, effects of the selection of working fluid and pinch temperature difference are investigated on the performance of the heat exchanger including the effectiveness of the heat exchanger, exergy destruction, second-law efficiency, number of transfer unit (NTU), and pinch point. The temperature distribution are shown depending on the working fluids and the pinch temperature difference. The results show that the performance of the heat exchanger depends on the pinch temperature difference sensitively. As the pinch temperature increases, the exergy destruction in the evaporator increases but the effectiveness, second law efficiency and NTU decreases.
Reduction and Decomposition Characteristics of CaSO
Based Oxygen Carrier Particles
RYU, HOJUNG ; KIM, HANA ; LEE, DONGHO ; JIN, GYOUNGTAE ; BAEK, JEOMIN ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 600~608
DOI : 10.7316/KHNES.2015.26.6.600
As a candidate for cheap oxygen carrier,
based oxygen carriers have been developing. However, research on reaction characteristics and side reaction of
based oxygen carrier is very limited. There are many possible reactions for main components of syngas from coal. In this study, we prepared three
based oxygen carriers (
-CaO/bentonite) and performed reduction tests by hydrogen. Cyclic reduction-oxidation tests up to
cycle are also conducted using hydrogen as fuel. Reduction reactivity of those
based oxygen carriers were compared with that of NiO based oxygen carrier (OCN703-1100). Real weight change fractions of
based oxygen carriers were higher than theoretical oxyen transfer capacity and reactivity of these particles decreased with the number of cycle increased. To check possible side reaction of
based oxygen carriers,
decomposition tests were carried out and
was detected even at
. Consequently, we could conclude that
based oxygen carriers decompose and release
and this reaction lead reactivity decay of
based oxygen carries.
Bio-Jet Fuel Production Technologies for GHG Reduction in Aviation Sector
KIM, JAE-KON ; PARK, JO YONG ; YIM, EUI SOON ; MIN, KONG-IL ; PARK, CHEON-KYU ; HA, JONG-HAN ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 609~628
DOI : 10.7316/KHNES.2015.26.6.609
Thie study presents the biomass-derived jet (bio-jet) fuel production technologies for greenhouse gas (GHG) reduction in aviation sector. The aviation sector is responsible for the 2% of the world anthropogenic
emissions and the 10% of the fuel consumption: airlines' costs for fuel reach 30% of operating costs. In addition, the aviation traffic is expected to double within 15 years from 2012, while fuel consumption and
emissions should double in 25 years. Biojet fuels have been claimed to be one of the most promising and strategic solutions to mitigate aviation emissions. This jet fuel, additionally, must meet ASTM International specifications and potentially be a100% drop-in replacement for current petroleum jet fuel. In this study, the current technologies for producing renewable jet fuels, categorized by alcohols-to-jet, oil-to-jet, syngas-to-jet, and sugar-to-jet pathways are reviewed for process, economic analysis and life cycle assessment (LCA) on conversion pathways to bio-jet fuel.
The Study on Effect of Emissions and Performance of a Conventional Vehicle using the High Concentration Alcohol Blended Petroleum Product
KIM, SUNG-WOO ; DOE, JIN-WOO ; KIM, KI-HO ; HA, JONG-HAN ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 629~637
DOI : 10.7316/KHNES.2015.26.6.629
As concern about energy security and global warming many countries have been making effort to reduce fossil fuel. In the case of US, as one of the efforts, the standards of the alcohol vehicle fuels(including blended with gasoline) have been established. Alcohol is known that make some trouble concerning startability, durability and corrosion when using as fuel of a conventional vehicle. For these reason, alcohol usage needs not only the fuel standard, but also a modified car. In the case of Korea, although there are no the standard and the modified vehicle yet, high concentration alcohol blended fuel has being sold at illegal market. In this study, exhaust gas and performance of the conventional vehicle that alcohol(methanol and isopropyl alcohol) blends were fueled were measured to notify danger of using them without preparation of institutional arrangements. Also, to analyze correlation characteristics of the fuels and them, property test of the fuels was conducted. The test result show that bad-startability caused by low RVP and high T10 affected increase in NMOG and CO. NOx was increased under the highest short term fuel trim caused by high Oxygen content and low NHV of alcohol. According to increasing as alcohol content, fuel economy and acceleration ability were decreased but
was not significantly decreased.
A Study on Design of the Linear Generator in the Double Acting Stirling Engine
PARK, SEONGJE ; KO, JUNSEOK ; HONG, YONGJU ; KIM, HYOBONG ; YEOM, HANKIL ; IN, SEHWAN ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 638~644
DOI : 10.7316/KHNES.2015.26.6.638
This paper describes the continuing effort to analysis and design on dynamic and electrical behavior of gamma-type free piston Stirling engine/generator with dual-opposed linear generator for domestic micro-CHP (Combined Heat and Power) system. The double acting Stirling engine/generator has one displacer and two power piston which are supported by flexure springs. Two power pistons oscillate with symmetric sinusoidal displacement and are connected with moving magnet type linear generators for power generation. To operate Stirling engine/generator, combustion heat of natural gas is supplied to hot-end and heat is rejected from cold-end by cooling water. The temperature difference across the displacer induces the oscillating motion, and it can be explained with mass-spring vibration system. The purpose of this paper is to describe the design process of linear generator for the double acting free-piston Stirling engine.
Numerical Study on Human Thermal Comfort in a Low Floor Bus
PARK, WON GU ; KIM, MAN-HOE ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 645~651
DOI : 10.7316/KHNES.2015.26.6.645
Numerical study on human thermal comfort in a low floor bus has been conducted. Human thermal comfort in a bus depends mainly on air temperature, air velocity, mean radiant temperature, humidity, and direct solar flux, as well as the level of activity and thermal properties of clothing. The paper presents the velocity and temperature distribution, Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD) indices for the driver and passengers.
The Study About Deformation of a Peristaltic Pump using Numerical Simulation
HUNG, NGUYEN BA ; LIM, OCKTAECK ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 652~658
DOI : 10.7316/KHNES.2015.26.6.652
The purpose of this study is to investigate the effects of changing dimension of a soft tube in a peristaltic pump on deformation, stress and fluid flow rate of the peristaltic pump. Geometries of the peristaltic pump is created in a Catia drawing software based on specifications of a real peristaltic pump. Afterwards, the geometries of this pump is imported into a commercial Ansys software to calculate deformation, stress, and fluid flow rate of this pump. The simulation results showed that the deformation and stress of the soft tube is increased by increasing soft tube diameter from 2 mm to 4 mm. When the tube diameter is increased to 5 mm and tube thickness is reduced to 0.5 mm, the soft tube is damaged. The highest fluid flow rate could be found at the tube thickness and diameter of 1 mm and 4 mm, respectively.
Experimentally Evaluation of a Liquid Pool Spreading Model with Continuous Release
KIM, TAEHOON ; DO, KYU HYUNG ; KIM, MYUNGBAE ; HAN, YONG-SHIK ; CHOI, BYUNG-IL ;
Transactions of the Korean hydrogen and new energy society, volume 26, issue 6, 2015, Pages 659~665
DOI : 10.7316/KHNES.2015.26.6.659
In this study, an experimental investigation is performed for evaluation of a liquid pool spreading model with continuous release. The model considered in this study was developed based on a concept which means that the liquid pool spreading is governed by a balance between an inertia force from gravity and a frictional force from friction with the ground under the whole base of the liquid pool. For evaluation of the model, experimental study is performed. Experimental apparatus is setup for measuring release rate, spreading velocity, and evaporation rate from a liquid pool. The experimental results are compared with results from the model. By applying release and evaporation rates obtained from experiments to solving the model, liquid pool radius variation according to time can be obtained. For evaluation of an effect of friction force in the spreading model, results obtained from the models with and without the friction force are compared with those obtained from the experiments. As a result, it is shown that there exists a large deviation between the results obtained from the model without the friction force and the experimental results. On the other hand, the tendency of liquid pool radius variation according to time is similar between the results obtained from the model without the friction force and the experimental results.