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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Energy Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Energy Engineering
Editor in Chief :
Volume & Issues
Volume 19, Issue 4 - Dec 2010
Volume 19, Issue 3 - Sep 2010
Volume 19, Issue 2 - Jun 2010
Volume 19, Issue 1 - Mar 2010
Selecting the target year
Strategies of Technology Development for Improvement of National Energy Resources Supply
Lim, Jong-Se ;
Journal of Energy Engineering, volume 19, issue 2, 2010, Pages 57~61
In order to make higher domestic self-sufficiency ratio of energy resources, these are required to purchase the producing oil & gas fields through the investment of oversea petroleum development, to make M&A, and to enhance recovery in the existing oil & gas fields. For this purpose, it is essential to acquire the core technology regarding the evaluation, design, and management of oil & gas fields. The accumulation of technology of the evaluation, optimal design, proper management of production fields by the help of the continuous R&D program will make great contribution for higher domestic self-sufficiency ratio by the increased number of purchase of foreign producing fields, the increase amount of produced petroleum out of existing fields, and the effective management of the oil and gas fields.
Anode materials advance in solid oxide fuel cells
Son, Young-Mok ; Cho, Mann ; Kil, Sang-Cheol ; Kim, Sang-Woo ; Nah, Do-Baek ;
Journal of Energy Engineering, volume 19, issue 2, 2010, Pages 62~72
Solid oxide fuel cells(SOFCs) directly convert the fuel gases to electric energy through electrochemical reactions. The advantage of SOFCs is that they easily operate with diversified fuels such as natural gases owing to their high temperature operation. However, high temperature operation also incurs the challenge in enhancing long term reliability and durability of SOFCs. The most commonly used anode material is Ni/YSZ. This has, however, some drawbacks in terms of long-term reliability at high temperatures, hydrocarbon fuel usages, and so on, therefore the need to develop the new anode materials increases. This article summarizes the trend of the novel anode materials development of SOFCs.
Cathode materials advance in solid oxide fuel cells
Son, Young-Mok ; Cho, Mann ; Nah, Do-Baek ; Kil, Sang-Cheol ; Kim, Sang-Woo ;
Journal of Energy Engineering, volume 19, issue 2, 2010, Pages 73~80
A solid oxide fuel cells(SOFC) is a clean energy technology which directly converts chemical energy to electric energy. When the SOFC is used in cogeneration then the efficiency can reach higher than 80%. Also, it has flexibility in using various fuels like natural gases and bio gases, so it has an advantage over polymer electrolyte membrane fuel cells in terms of fuel selection. A typical cathode material of the SOFC in conjunction with yttria stabilized zirconia(YSZ) electrolyte is still Sr-doped
(LSM). Recently, application of mixed electronic and ionic conducting perovskites such as Sr-doped
(LSCF) has drawn much attention because these materials exhibit lower electrode impedance than LSM. However, chemical reaction occurs at the manufacturing temperature of the cathode when these materials directly contact with YSZ. In addition, thermal expansion coefficient(TEC) mismatch with YSZ is also a significant issue. It is important, therefore, to develop cathode materials with good chemical stability and matched TEC with the SOFC electrolyte, as well as with high electrochemical activity.
Lithium-Ion Batteries for Plug-In Hybrid Electric Vehicle
Cho, Mann ; Son, Young-Mok ; Nah, Do-Baek ; Kil, Sang-Cheol ; Kim, Sang-Woo ;
Journal of Energy Engineering, volume 19, issue 2, 2010, Pages 81~91
Plug-in hybrid electric vehicles(PHEVs) are gaining attention over the world due to their abilities to reduce
emission and gasoline/diesel consumption by using electricity from the grid. Lithium ion battery is one of the most suitable candidates as energy storage device for PHEVs applications up to 2030. This review focuses on the present status of lithium ion battery technology, then on comparison of the performance characteristics of the promising cathode materials.
Potential Impacts and Energy Cost of Grid-Connected Plug-in Electric Vehicles
Lee, Kyoung-Ho ; Han, Seung-Ho ;
Journal of Energy Engineering, volume 19, issue 2, 2010, Pages 92~102
Plug-in hybrid electric vehicle(PHEV) is a hybrid electric vehicle (HEV) with more added battery capacity that can be recharged from the electric power grid. Plug-in battery electric vehicle(PBEV) is a pure electric vehicle that uses only electric motor using electricity from battery that recharged from the power grid. PHEV and PBEV requires recharging of batteries in the vehicles from electric power grid. Recently, PHEVs and PBEV are being developed around the world. It is important to understand how these electric vehicles affect power demands and carbon dioxide emissions. From vehicle customer viewpoint, running energy cost will be imporatnt factor to consider. This paper analyzes the potential impacts of PHEVs and PBEVs on electric power demand, and associated CO2 emissions in 2020 with an projection that the vehicles will be penetrated with 10% market share. Energy costs for the vehicles are also calculated and compared with the conventional combustion vehicle.
Status and Feasibility Study on Tidal Energy Technology
Cho, Young-Beom ; Wee, Jung-Ho ; Kim, Jeong-In ;
Journal of Energy Engineering, volume 19, issue 2, 2010, Pages 103~115
Currently, many nations in the world make a strong effort to exploit the new and renewable energy. Tidal energy is the constant and regular power sources with higher and more stable quality compared to other renewable sources. The present paper reports the status of tidal energy analyzing its latest technology and development. In addition, a feasibility study on two types of tidal power plant(TPP) systems is conducted based on many assumptions, conditions and data involved in the Korea environment. The Sihwa and Uldolmok TPP are considered as the reference of tidal barrage(TB) and tidal in stream energy conversion(TISEC) type, respectively. While TB technology is currently mature and reliable, there still remain many environmental issues. Whereas, TISEC is recently received more attention due to its environmental friendly aspect. Therefore, the TISEC is believed to be very promising technology as the TPP. The unit electricity generation cost of Sihwa TPP is approximately 67.3 KRW/kWh. However, considering additional cost of Sihwa lake construction, it increases to 254 KRW/kWh. In Uldolmok, the unit electricity generation cost is calculated to be about 400 KRW/kWh, which is even higher than that of Sihwa TPP. This is ascribed to high cost of TISEC device and construction cost due to its technological infancy as well as relatively small power capacity. Nevertheless, the TISEC technology would be substantially developed in the future due to its many advantageous features.
A Study on Characteristics of Drag Reduction Additive under High Temperature Range
Cho, Sung-Hwan ; Ryu, Jae-Sung ; Jung, Sang-Hoon ;
Journal of Energy Engineering, volume 19, issue 2, 2010, Pages 116~120
Overall total length of hydraulic pipe to transport the hot water in the domestic district heating network is above 3,000 Km approximately. This long pipe network requires a lots of the transport pumping power by surface friction of fluid. In this study, the drag reduction(DR) of Amin Oxide
as non-ionic surfactant according to the fluid velocity, temperature and surfactant concentration under the condition of above
fluid temperature were investigated experimentally. Results showed that new amin oxide
surfactant had DR of maximum 30% in fluid temperature of
and had 15% DR in fluid temperature over
under short time test condition. And amine oxide had 155 hours duration time to keep the DR characteristic in the fluid temperature of
and 1000 ppm concentration. But duration time of DR was decreased when fluid temperature increased.
Synthesis and characterization of sulfonated poly(arylene biphenylsulfone ether) copolymers containing hydroquinone moiety for polymer electrolyte membrane
Yoo, Dong-Jin ;
Journal of Energy Engineering, volume 19, issue 2, 2010, Pages 121~127
In present work, sulfonated poly(arylene biphenyklsulfone ether) copolymers containing hydroquinone moiety were successfully synthesized using 4,4'-bis[(4-chlorophenyl)sulfonyl]-1,1'-biphenyl(BCPSBP), hydroquinone sulfonic acid potassium salt(sHQ), 4,4'-sulfonyldiphenol and evaluated their characteristics. Three kinds of polymer electrolyte membranes, PBPSEH-HQ00, PBPSEH-HQ10 and PBPSEH-HQ30 were prepared by using mole fraction of sulfonated hydroquinone(sHQ). The structure of the fabricated polymers was analyzed using NMR, IR and GPC. The Mw(weight-average molecular weights) of the polymers were in the range of 62,000-213,000 g
, and the molecular weight distribution (Mw/Mn) varied from 1.66-4.04. The thermal analysis of the copolymers was carried out by TGA and DSC. The temperature of Td5% and Td10% was decreased with the mole fraction of sHQ but Tg was increased with the mole fraction. The water uptake, IEC and ion conductivity were increased with increasing the ionic cluster of the polymers. The proton conductivity equal to 9.4 mS
was measured for the PBPSEH-HQ30 membrane at
and 100% relative humidity. From the observed results it is clear that the prepared hydrocarbon membrane can be considered as suitable polymer electrolyte membrane for the application of PEMFC.
Development of an Embedded Solar Tracker using LabVIEW
Oh, Seung-Jin ; Lee, Yoon-Joon ; Kim, Nam-Jin ; Oh, Won-Jong ; Chun, Won-Gee ;
Journal of Energy Engineering, volume 19, issue 2, 2010, Pages 128~135
This paper introduces step by step procedures for the fabrication and operation of an embedded solar tracker. The system presented consists of application software, compactRIO, C-series interface module, analogue input module, step drive, step motor, feedback devices and other accessories to support its functional stability. CompactRIO that has a real-tim processor allows the solar tracker to be a stand-alone real time system which operates automatically without any external control. An astronomical method and an optical method were used for a high-precision solar tracker. CdS sensors are used to constantly generate feedback signals to the controller, which allow a solar tracker to track the sun even under adverse conditions. The database of solar position and sunrise and sunset time was compared with those of those of the Astronomical Applications Department of the U.S. Naval Observatory. The results presented here clearly demonstrate the high-accuracy of the present system in solar tracking, which are applicable to many existing solar systems.
Combustion characteristics of two imported Indonesia coals as a pulverized fuel of thermal power plants
Lee, Hyun-Dong ; Kim, Jae-Kwan ;
Journal of Energy Engineering, volume 19, issue 2, 2010, Pages 136~142
Combustion reactivity and thermal behavior of two imported coals used as a pulverized fuel of commercially thermal power plant were investigated by thermogravimetric analysis (TGA) and large scale test furnace of 200 kg/hr. TGA results showed that combustion efficiency of high moisture coal has lower than reference coal due to the slow combustion completion rate although it has the low ignition temperature, and activation energies of high moisture coal with 79 kJ/mol for overall combustion was higher than reference coal of 53 kJ/mol. Test furnace results ascertained that flame of black band of high moisture coal during the combustion in boiler broke out compared to reference coal and then it becomes to unburned carbon due to the less reactivity and combustion rate. But, Blending combustion of high moisture coal with design coal of high sulfur are available because sulfur content of high moisture coal was too low to generate the low SOx content in flue gas from boiler during the combustion. The ash analysis results show that it was not expected to be associated with slagging and fouling in pulverized coal fired systems due to the low alkali metal content of
compared to bituminous coal.