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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
Analysis of Cooldown Capability for the HWR Shutdown Cooling System
Sin, Jeong-Cheol ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 259~266
DOI : 10.5855/ENERGY.2011.20.4.259
Following the reactor shutdown, the reactor shutdown cooling system must be designed to supply the coolant sufficiently not only to remove the decay heat but to maintain the adequate cooling rate to protect the reactor equipments. In this study, KDESCENT code for the light water reactor and SOPHT, SDCS codes for the heavy water reactor were compared and analyzed to investigate the cooling capability during the shutdown cooling process. The shutdown cooling system design requirements were satisfied during cooling process for both the SDCP and the HTP modes and the design cooling rate of
or below was maintained using the SDC heat exchangers. This study shows that the shutdown cooling system in the Wolsong 2, 3, 4 reactors provides sufficient cooling to maintain the nuclear fuel integrity by removing the decay heat of the nuclear fission product.
The Socio-technical Constituency behind New & Renewable Energy Technology Development in a Latecomer: The Case study of New & Renewable Technology Program of Korea
Lim, Hong-Tak ; Kim, Sin ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 267~277
DOI : 10.5855/ENERGY.2011.20.4.267
The study looks at the development of new & renewable technology in a latecomer country, Korea. The main question is whether the development is driven by 'green demand' from the people or by the 'growth demand' from the industry. It also asks what are the characteristics of socio-technical constituency behind the development of new & renewable energy technology; growth-centered or environment-centered. It is found out that a 'New & renewable energy technology socio-techical constituency', consisted of NGOs, industry and government in the form of membership to New & Renwable Energy Policy Council of the government program, was established driving the development of new & renewable energy technology development in Korea. Yet, the coalition among them was based on 'the desire for growth' rather than 'the concern for environment'. The changes in authoritarian development state such as the adoption of governance approach to public decision-making process also contributed to the formation of the constituency.
Computational Modeling of Charge-Discharge Characteristics of Lithium-Ion Batteries
Lee, Dae-Hyun ; Yoon, Do-Young ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 278~285
DOI : 10.5855/ENERGY.2011.20.4.278
Computational modelling and simulation for the charge-discharge characteristics of Lithium-ion batteries have been carried out. The battery system consists of a simplified 2-dimensional single cell for the modelling, in which the thermal modelling on the charge-discharge characteristics was conducted in the temperature range from 288 K through 318 K by using FEMLAB as an engineering PDE solver. While material parameters adopted in the present modelling were dependent on the system temperature, their thermal modelling were applied on the simulations of the charge-discharge period and the rate of transferring charges systematically. The resulting simulation shows that the cycle of the charge-discharge shorten itself by reducing the system temperature, regardless of the charge-discharge rates. In addition, the mass-transport phenomena of Lithium ion have been discussed in connection with the charge-discharge characteristics in the battery.
A Theoretical Study on Fuel Economy Improvements by Pneumatic Type Braking Energy Regeneration System Using the Scroll Mechanism
Shin, Dong-Gil ; Kim, Young-Min ; Kim, Yong-Rae ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 286~291
DOI : 10.5855/ENERGY.2011.20.4.286
The hybrid vehicle has a good fuel economy with a electric type braking energy regeneration system. This paper introduced a novel pneumatic type braking energy regeneration system. The novel system use a scroll mechanism which have both compression function and expansion function. While vehicle is decelerating, the scroll machinery, being operated as a scroll compressor, compress a atmospheric air to save the vehicle's kinetic energy and reuse a compressed air which is reserved in a air tank while vehicle is accelerating. In order to analyze fuel improvements by applying braking energy regeneration system to a vehicle, we simulated the rate of braking energy regeneration through CVS-75 mode driving patterns.
An Experimental Study on Detection of Gas Leakage Position by Monitoring Pressure Values at City Gas Pipeline
Jin, Kyoung-Min ; Choi, Gyu-Hong ; Lee, Song-Kyu ; Chung, Tae-Yong ; Shin, Dong-Hoon ; Hwang, Seung-Sik ; Oh, Jeong-Seok ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 292~297
DOI : 10.5855/ENERGY.2011.20.4.292
Gas pipeline safety management and risk prediction are recognized as a very important issue. And the effort to prevent accidents is essential. So, in this study, it was studied through correlation of pressure changes for leak point detection in real-time. It experimented by installing the five leakage valves in the pipe of 378 m and compared the actual leak points with simulation results. The results showed that experimental leak points and the actual leak points have differences within the 6 m. And this technology has to be commercialized by the demonstration in dangerous zone.
Reforming Tar from Biomass Gasification using Limonite and Dolomite as Catalysts
Kim, Hee-Joon ; Kunii, Hiroo ; Li, Liuyun ; Shimizu, Tadaaki ; Kim, Lae-Hyun ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 298~302
DOI : 10.5855/ENERGY.2011.20.4.298
In this study, Catalytic reforming with vapor and biomass gasification was simultaneously performed in a same fixed bed reactor at
. Light gases were produced from reformation of the tar (fuel gases) in biomass gasification by using limonite and dolomite, as catalysts. Hydrogen and carbon dioxide are main components in light gases. Hydrogen yields increased with temperature increasing in the range of
, because the water shift reaction was promoted by catalyst. The yield of hydrogen gas was increased about 160% under catalyst with the mixture of limonite and dolomite comparing to limonite only.
A Numerical Analysis of the Reverse Heat Loss Method for a Refrigerator
Ha, Ji-Soo ; Shim, Jae-Sung ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 303~308
DOI : 10.5855/ENERGY.2011.20.4.303
The present study has been carried out to predict the heat transfer characteristics of reverse heat loss method for a residential refrigerator by using numerical analysis and corresponding experiment. From the measured values of temperature and heat input, one can conclude that, the temperature inside the refrigerator has a nearly linear relationship with heat input. The effect of gasket heat loss was examined with the change of thermal conductivity of gasket region. The appropriate thermal conductivity of gasket region was acquired from the comparison of heat losses with the experimental result and numerical analysis. The result of calculated heat losses had accuracy within 1.8% error with the experimental result. With the selected thermal conductivity of gasket region, the effectiveness of reverse heat loss method was examined with the change of thermal conductivity of vacuum insulation panel.
Study on the Effect of Physical Properties of Fuels on the Anode Reaction in a DCFC System
Ko, Tae-Wook ; Ahn, Seong-Yool ; Choi, Gyung-Min ; Kim, Duck-Jool ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 309~317
DOI : 10.5855/ENERGY.2011.20.4.309
The effect of physical properties of coal fuels and carbon particle on performance of DCFC (Direct Carbon Fuel Cell) was investigated. Shenhua and Adaro were selected as coal fuel and carbon particle was used for comparing with coal. The Ultimate, proximate, SEM, XRD, and BET analysis of samples were conducted. The component of char was more important than that of raw coal because the operating temperature of reactor is higher than devolatilization region of coal. The surface area and volume of pores affected significantly the performance of the system than content of fixed carbon or char rates. The performance of DCFC with carbon particle was in proportional to working temperature.
An Empirical Study on the Consumption Function of Korean Natural Gas for City Gas - Using Time Varying Coefficient Time Series Model -
Kim, Jum-Su ; Yang, Chun-Seung ; Park, Jung-Gu ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 318~329
DOI : 10.5855/ENERGY.2011.20.4.318
This study focuses on enhancing the accuracy of consumption function of Korean natural gas for city gas. It is using time-series model with time-varying coefficients taking into account the recent abnormal temperature phenomenon and the changing gross domestic product (GDP) as important variables. This study estimates the cointegrating regression model for the long-run estimation and the error correction model for the short-run estimation. The consumption function of Korean natural gas is estimated to be influenced by the time-varying coefficients of GDP and temperature. Using the estimated time-series model with time-varying coefficients, this study forecasts the consumption of natural gas for city gas from July 2011 to December 2012. The consumption in 2011 would be 18,303 thousand tons, which is little different from the imported 18,681 thousand tons. The consumption of natural gas for city gas in 2012 is forecast to be 19,213 thousand tons. The consumption model of this study is needed to extend by considering the relative prices between natural gas and its substitutes, the scale of consumers and others.
Evaluation on Characteristics and Economical Efficiency of X-L Pipe Boiler with Electric Heat Closed Type
Kim, Su-Man ; Chun, Tae-Kyu ; Yang, Young-Joon ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 330~337
DOI : 10.5855/ENERGY.2011.20.4.330
In these days, the gas or kerosene boiler was usually used as heating system. This study was carried out to investigate the merits of X-L pipe boiler with electric heat line that was specially manufactured. The electric heat line was inserted into inside of X-L pipe and voltage was impressed to electric heat line and, as a result, temperature of X-L pipe filled with heat medium was increased. As changing the number of electric heat line and voltage, the characteristics of X-L pipe boiler and its mechanism on heat generation were studied. Furthermore, the economical efficiency was evaluated by comparing heating cost of X-L pipe boiler with those of kerosene boiler and natural gas boiler, respectively. As the results, it was confirmed that heating cost of X-L pipe boiler was showed as 28% of kerosene boiler and 58% of natural gas boiler.
Experimental Study of Flow Characteristics with Swirl Number on Dump Combustor
Park, Jae-Young ; Han, Dong-Sik ; Kim, Han-Seok ; Song, Ju-Hun ; Chang, Young-June ; Jeon, Chung-Hwan ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 338~345
DOI : 10.5855/ENERGY.2011.20.4.338
The swirl flow applied for high efficiency and reduction of emission such as NOx, CO in a gas turbine engine makes recirculation zone by shear layer in the combustion chamber. This recirculation zone influences a decreasing flame temperature and flame length by burned gas recirculation. Also it is able to suppress from instability in lean-premixed flame. In this study, it was found that the swirl flow field was characterized as function of swirl number using PIV measurement in dump combustor. As increasing swirl number, a change of flow field was presented and recirculation zone was shifted in the nozzle exit direction. Also turbulent intensity and turbulent length scale in combustor were decreased in combustion. It has shown reduction of eddies scale with swirl number increasing.
A Study on Char Oxidation Kinetics by Direct Measurement of Coal Ignition Temperature
Kwon, Jong-Seo ; Kim, Ryang-Gyoon ; Song, Ju-Hun ; Chang, Young-June ; Jeon, Chung-Hwan ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 346~352
DOI : 10.5855/ENERGY.2011.20.4.346
The experiment was designed to study the char oxidation kinetics of pulverized coals commonly utilized in Korean power plants. The kinetics has been estimated using the Semenov's thermal spontaneous ignition theory adapted to coal char particle ignition temperature. The ignition temperature of coal char particle is obtained by a direct measurement of the particle temperature with photo detector as well as by means of a solid thermocouple which is used as both a heating and a measuring element. The ignition temperatures for subbituminous coal, Wira, and bituminous coal, Yakutugol, have been measured for 4 sizes in the range of 0.52-1.09 mm. The ignition temperature of the particle increases with the increasing diameter. The results were used to calculate the activation energy and the pre-exponential factor. As a result, the kinetic parameters are in an agreement with ones reported from other investigations.
Development of an AVR MCU-based Solar Tracker
Oh, Seung-Jin ; Lee, Yoon-Joon ; Kim, Nam-Jin ; Hyun, Joon-Ho ; Lim, Sang-Hoon ; Chun, Won-Gee ;
Journal of Energy Engineering, volume 20, issue 4, 2011, Pages 353~357
DOI : 10.5855/ENERGY.2011.20.4.353
An embedded two-axis solar tracking system was developed by using AVR micro controller for enhancing solar energy utilization. The system consists of an Atmega128 micro controller, two step motors, two step drive modules, CdS sensors, GPS module and other accessories needed for functional stability. This system is controlled by both an astronomical method and an optical method. Initial operation is performed by the result from the astronomical method, which is followed by the fine controlled operation using the signals from Cds sensors. The GPS sensor generates UTC, longitude and latitude data where the solar tracker is installed. A database of solar altitude, azimuth, and sunrise and sunset times is provided by UART (Universal Asynchronous Receiver/Transmitter).