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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 20, Issue 4 - Dec 2011
Volume 20, Issue 3 - Sep 2011
Volume 20, Issue 2 - Jun 2011
Volume 20, Issue 1 - Mar 2011
Selecting the target year
Improvement of the Negative Plate Performance on Industrial Ni-Zn Battery
Park, Dong-Pil ; Kim, Lae-Hyun ;
Journal of Energy Engineering, volume 20, issue 2, 2011, Pages 77~83
DOI : 10.5855/ENERGY.2011.20.2.077
It is requested to improve negative electrode of Ni-Zn battery for industrial application. Ni-Zn battery has main problems not to commercialize because of short life cycle, heavy gassing and fast electrolyte vaporization so far. It has been studied on 8 cells performances under promoting electric, additional materials and binders changed. With these materials(
), negative electrolyte can be manufactured equal and tight as well as low gassing. Furthermore, to supply EG-EP#12(gravity 1.26), keeping stable electrolyte gravity in battery, the life cycle of Ni-Zn battery is extremely improved 200~300% than initial performance.
A Study of Sewage Sludge Solubilization by Alkali and Ultrasonic pretreatment
Kim, Jae-Hyung ; Yang, Hong-Gyu ; Lee, Joon-Cheol ; Park, Hong-Sun ; Choi, Gwang-Geun ; Pak, Dae-Won ;
Journal of Energy Engineering, volume 20, issue 2, 2011, Pages 84~89
DOI : 10.5855/ENERGY.2011.20.2.084
In this study, individual(alkaline, ultrasonic) and combined(alkaline+ultrasonic) pretreatment effect on sewage sludge solubilization was investigated. COD solubilization rates increased with the dose of NaOH added: solubilization reached 27.6%. Additional alkaline agents did not increase solubilization further. Ultrasonic pretreatment achieved 33~39% solubilization when 140 W/L amplitude. In(alkaline(pre-treatment)+ultrasonic (after-treatment)) treatment, solubilization increased as the combined intensity in creased(
). SCOD rising rate(0.076) was achieved.
Assessment of Composite Material Flaws on the Type III Cylinders for Compressed Natural Gas Vehicles
Kim, Young-Seob ; Kim, Lae-Hyun ; Yang, Dong-Ju ;
Journal of Energy Engineering, volume 20, issue 2, 2011, Pages 90~95
DOI : 10.5855/ENERGY.2011.20.2.090
This study was conducted to judge requalification of cylinders by assessing composite flaws such as scratches, cuts, and gouges damaging on the composite of Type III cylinders for compressed natural gas vehicles. As a result of the flaw tolerance test, all specimens have satisfied with minimum requirement cycles according to damage levels based on ISO 19078 and cyclic performance for pressure showed beyond twenty thousands in damage level 1 and 2, and did eighteen thousands to twenty-one thousands in damage level 3. Eight of twelve specimens failed the test due to composite flaws and the rest of the cylinders failed regardless of flaws. The results of Finite Element Method followed by the computer simulation indicated that the stress of 79.5 MPa calculated on the flaw model of
and the stress of 66.6 MPa on the non-flaw model when the service pressure applied to inside of cylinder. The difference between the models is about 19.37%. We concluded that this difference influences fatigue life and this flaw model is a critical value affecting cyclic performance of cylinders.
Heat Transfer Characteristics by Rods in Transition Region of Impinging Air Jet
Kum, Sung-Min ;
Journal of Energy Engineering, volume 20, issue 2, 2011, Pages 96~102
DOI : 10.5855/ENERGY.2011.20.2.096
This research has been proceeded over the transition region(H/B=10) of two-dimensional impinging air jet system, in which square rods has been set up in front of heating surface in order to increase heat transfer. The objective of this research was to investigate the characteristics of heat transfer and air flow, in cases the clearance from rods to heating surface(C=1, 2, 4, 6 mm) and the width of rods(W=4, 6, 8 mm) changed. And this research compared the above with the experimentation without rods. As result, heat transfer performance was best under the condition of C=1 mm, and as the width is 8 mm, it is largely influenced by eddies and acceleration in case width of rods changed.
Characterization on the electrochemical and structural properties of polyanion cathode material Li
/C depending on the synthesis process
Lee, Young-Lim ; Chung, Young-Min ; Song, Min-Seob ; Ju, Jeh-Beck ; Cho, Won-Il ;
Journal of Energy Engineering, volume 20, issue 2, 2011, Pages 103~108
DOI : 10.5855/ENERGY.2011.20.2.103
/C was synthesized by solid state reaction and solution synthesis with sucrose for carbon source. The X-ray diffraction patterns of solid state reaction indicates small amount of impurities. By FE-SEM and HR-TEM, solution synthesis comprised several tens of nanometer comparing to 500~600 nm of
/C prepared by solid state reaction. The
/C prepared by solution synthesis show better electrochemical performance than solid state reaction. The first charge-discharge capacity are 236, 189 mAh/g respectively by solution synthesis. But its cycle performance was poor as yet and its capacity retention was 62% after 10 cycles.
Li-Ion Traction Batteries for All-Electric Vehicle
Cho, Mann ; Nah, Do-Baek ; Kil, Sang-Chul ; Kim, Sang-Woo ;
Journal of Energy Engineering, volume 20, issue 2, 2011, Pages 109~122
DOI : 10.5855/ENERGY.2011.20.2.109
The production capacity of EV models should be sufficient to achieve the goal of one million EVs by 2015. Large-Format lithium-ion battery are expected to find a prominent role as ideal electrochemical storage systems in traction power train for sustainable vehicles such as all-electric vehicles. This review focuses first on the present status of production lithium-ion battery technology and cooperative relations of between battery and EV makers, then on its near future development.
Research and Development & Commercial Deployment Status for Coal Gasification Technology - Mainly from GTC 2010
Lee, Jin-Wook ; Yoo, Young-Don ; Yun, Yong-Seung ;
Journal of Energy Engineering, volume 20, issue 2, 2011, Pages 123~142
DOI : 10.5855/ENERGY.2011.20.2.123
Coal Gasification Technology is one of the best alternatives among clean fossil fuel utilization. Major technology holding companies are devoting their efforts to develop more advanced technology to dominate the market in advance because of its importance on the applications such as IGCC, CTL, coal to SNG, various chemicals and so on. Japan and China, as well as America and European countries, have developed couple of thousands ton/day-class coal gasification technology. However, our gasification technology remains in the development stage with couple of ton/day-class pilot plant. So, we should be interested in developing this technology considering that we are heavily dependent of coal energy. In this paper, we summarized the trend and status of coal gasification technology development and commercial deployment of major technology holding companies mainly from the presentation materials of 'Gasification Technology Conference 2010', which is the biggest place of information exchange for recent coal gasification technology.
Offshore Wind Power, Review
Nah, Do-Baek ; Shin, Hyo-Soon ; Nah, Duck-Joo ;
Journal of Energy Engineering, volume 20, issue 2, 2011, Pages 143~153
DOI : 10.5855/ENERGY.2011.20.2.143
Offshore wind power(OWP) is one of the most promising renewable energy and gives higher output than onland one due to stronger and consistent wind in offshore. it offsets shortcoming of noise, spatial limit and less affects scenery, and can be built in larger size. Korea has plenty of offshore wind resources as it is surrounded by the sea in three directions. This review describes recent progress in offshore wind turbine and substructure technology. Market trend in local and overseas, Number of papers published and patents registered are analysed.
Development of the Preventive Maintenance Template for Static Exciter in the Nuclear Power Plant
Chin, Soo-Hwan ; Park, Jin-Youb ; Hong, Young-Hee ;
Journal of Energy Engineering, volume 20, issue 2, 2011, Pages 154~162
DOI : 10.5855/ENERGY.2011.20.2.154
PMT(Preventive Maintenance Template) is a standardized maintenance program that describes maintenance items & period as operation condition to increase component reliability at the component level. The existing maintenance programs are focused on time based maintenance to inspect and repair component depend on fixed period. But recently, we have developed advanced maintenance program(named PMT) to increase reliability and optimize maintenance program of the plant significant component. This paper presents how to develop the PMT for nuclear power plant's static exciter.
A Numerical Analysis on Combustion Characteristics of the Gasoline Engine using Methanol Reformulated Fuels under WOT Condition
Lee, Suk-Young ; Jeon, Chung-Hwan ;
Journal of Energy Engineering, volume 20, issue 2, 2011, Pages 163~169
DOI : 10.5855/ENERGY.2011.20.2.163
This research is to decide the possibility of using RM50(reformulated methanol fuel) without any modification of engine by the method of numerical analysis. Comparing the heat release rate, the difference among each fuel was decreased according to the increase of the engine speed, and the maximum heat release rate was higher in the order of RM50 and gasoline fuel. Also, this order corresponds to the order of burning speed. RM50 had the higher turbulent burning speed, and the curve of turbulent intensity was showed similar tendency to the curve of turbulent burning speed. RM50 had relatively high burning speed, short quenching length, high temperature in cylinder, so that it might increase NO emission, but owing to chemical reaction dynamics, it was decreased NO emission. Therefore, in order to predict the possibility of using RM50, it is needed to consider not only the temperature in cylinder by low heating value, but also combustion characteristics including burning speed.