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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Energy Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Energy Engineering
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Volume & Issues
Volume 13, Issue 4 - Nov 2004
Volume 13, Issue 3 - Sep 2004
Volume 13, Issue 2 - Jun 2004
Volume 13, Issue 1 - Feb 2004
Selecting the target year
A Study on the Atomization Characteristics of the Ultrasonic-Energy-Irradiation High Viscosity Biodiesel Blended Fuel
Song Yong-Seek ; Yang In-Kwon ; Kim Bong-Seock ; Ryu Jung-In ;
Journal of Energy Engineering, volume 13, issue 4, 2004, Pages 235~241
This experiment was undertaken to investigate the atomization characteristics of the high viscosity biodiesel blended fuel and ultrasonic energy irradiation one. Test fuels were conventional diesel fuel and biodiesel one. We compared to the characteristics of viscosity and surface tension, SMD between high viscosity biodiesel blended fuel and ultrasonic energy irradiation one. Sauter mean diameter was measured under the variation of the spray distance. Viscosity and surface tension were measured under the variation of the time trace. To measure the droplet size, we used the Malvern system 2600c. Droplet size distribution was analyzed from the result data of Malvern system. Through this experiment, we found that the condition of the ultrasonic energy irradiation situation had smaller Sauter mean diameter of droplet, viscosity and surface tension than those of the conventional situation.
Design Optimization of Duplex Burnable Poison Rods and Feasibility Evaluation for Core Design
Yoon Seok-Kyun ; Lee Dae-Jin ; Kim Myung-Hyun ;
Journal of Energy Engineering, volume 13, issue 4, 2004, Pages 242~258
The duplex burnable poison absorbers concept was suggested by Korea Atomic Energy Research Institute. This BP rod is composed of inner region of natural U-Gd
and outer shell of enriched UO
. It is expected that this burnable absorber has same reactivity control capability with gadolinia burnable absorber used in extened fuel cycle. In order to evaluate the nuclear feasibility of duplex BPs, the nuclear design characteristics were compared with that of four types of burnable absorbers; gadolinia, erbia, IFBA, dysprosia duplex BP on 24 months fuel cycle for Korean Standard Nuclear Power plants. According to the evaluation results of nuclear characteristics, the duplex BPs were better than other BPs on k-infinitives, reactivity holddown worth (RHW), pin power peaking and moderator temperature coefficient (MTC). The possibility of nuclear core design was also confirmed based on the optimized fuel assemblies which were searched for a sensitivity analysis. Characteristics of core design with duplex BPs was compared with that of reference core with gadolinia BPs for cycle length, power peaking and MTC. The duplex BP core had a little longer cycle length by 4 to 7 days because of increased amount of fissile in enriched uranium at the outer shell of duplex BP In case of power peaking F
Q/ of duplex BP core was reduced from 1.5773 to 1.5335. MTC was also less -0.48 pcm/C than that of reference core. Finally, evaluation of fuel cycle economy was performed for the manufacturing feasibility test and fuel cost evaluation with duplex BPs. Fuel cycle economy of duplex BP core almost was equivalent with that of gadolinia BP core.
Specific Heat Characteristics of Ceramic Fuels
Kang Kweon Ho ; Park Chang Je ; Ryu Ho Jin ; Song Kee Chan ; Yang Myung Seung ; Moon Heung Soo ; Lee Young Woo ; Na Sang Ho ;
Journal of Energy Engineering, volume 13, issue 4, 2004, Pages 259~266
Specific heat mechanism of oxide fuel is contributed by lattice vibration, dilatation, conduction electron and defect and excess specific heat. Model of oxide fuel for specific heat consists of specific heat at constant pressure term, dilatation specific heat term and defect specific heat term. In this study experimental and published data on the specific heats of oxide nuclear fuels have been reviewed and analyzed to recommend the best fitting model. The oxide fuels considered in this paper were UO
, mixed (U, Pu) oxides and spent fuel. The specific heat data of spent fuel has been replaced by that of simulated fuel.
Comparison of the Heat transport Limitations for Screen Mesh Wick and Sintered Metal Wick Heat Pipes by Theoretical Analysis
Kim Keun-Bae ; Kim Yoo ;
Journal of Energy Engineering, volume 13, issue 4, 2004, Pages 267~274
Theoretical analysis for predicting the heat transport limitations of screen mesh wick and sintered wick heat pipes was performed. The heat pipe diameter was 8mm and water was used for working fluid. For the 250 mesh, each capillary pressures and heat transport limitations, thermal resistances were analyzed according to the operating temperatures, wick thicknesses and inclination angles, based on the effective capillary radius (r
c/), porosity (
) and permeability (K). The wick capillary limitation was increased as the operating temperature and the wick thickness were increased, and generally the sintered wick showed higher heat transport limitations than that of the screen wick. The thermal resistance of the screen wick was higher than that of the sintered wick and both thermal resistances were linearly increased as the wick thickness was increased.
The Effect of Ultrasonic Vibration on Heat Transfer Augmentation of Forced Convective Flow in Circular Pipes
Jeong Ji Hwan ;
Journal of Energy Engineering, volume 13, issue 4, 2004, Pages 275~280
Augmentation of heat transfer by ultrasonic vibration in pipes are investigated. Measurements of convective heat transfer coefficients on circular pipe walls are made with and without ultrasonic vibration applied to water. These data are compared with each other to quantify the effects of ultrasonic vibration on heat transfer enhancement. Numerical analysis has been also performed in order to extend the ranges of examined temperature and flow rate. FLUENT Ver.6.1 is used to simulate velocity and temperature fields and evaluate heat transfer coefficient with and without ultrasonic vibration. The results show that the ultra- sonic vibration enhances the Nusselt number of forced convection flow and the increase rate strongly depends on flow rate.
Investigation of Corrosion Mechanism by Analyses of Spent Chromia Refractory fvom a Coal Gasifier
Kim Han Bom ; Oh Myongsook ;
Journal of Energy Engineering, volume 13, issue 4, 2004, Pages 281~290
Spent refractories from a coal gasifier after 1000 hours of operation were analyzed for crystalline phases, chemical composition and microstructures as a function of slag penetration depth, and the slag corrosion mechanism was determined. The chemical corrosion of chromia refractory occurred via reaction between Cr
of the refractory and FeO and A1
in the slag. The FeO reacted with Cr
at the slare/refractory interface and formed FeCr
. After all FeO were consumed, Al in the penetrating slag substituted Cr in Cr
, forming (Al, Cr)
, at the edges of the particle, which were broken to form fragments rich in Al. The corrosion resistance of Cr
varied with the particle size and the extent of sintering, and the higher resistance was observed in the larger and more sintered particles. There was no chemical change in ZrO
, but showed the effects of physical corrosion: the grain boundaries became more wavy, and ZrO
grains were split in the corroded area. The slag penetration depth increased in the refractory samples farther down from the feed nozzles.
Design and Performance Estimation of Heat Regenerator for Small-scale Regenerative Radiant Tube Burner
Cho H. C. ; Cho K. W. ; Lee Y. K. ;
Journal of Energy Engineering, volume 13, issue 4, 2004, Pages 291~295
Heat regenerator attached in small-scale regenerative radiant tube burner was designed using the theoretical computation code and was confirmed the performance of waste heat recovery ratio. From the computation, when ceramic ball of 4-5kg was used, temperature efficiency and available waste heat recovery ratio were predicted 80% and 70%, respectively. Similar efficiencies were obtained from the experiments using LPG. However, since exhaust gas temperature entered into regenerator was below 850
which was moth lower than that we expected. air preheating temperature was lowered below 800
Performance Evaluation and Economic Estimation of Ground Source Heat Pump Cooling and Heating System
Lim Hyo Jae ; Song Yoon Seok ; Kong Hyoung Jin ; Park Seong Koo ;
Journal of Energy Engineering, volume 13, issue 4, 2004, Pages 296~300
Performance evaluation and economic estimation were conducted on the water to water GSHP (Ground Source Heat Pump) installed in existing building. Ground heat exchanger was a closed vertical loop type and sized to be 5 boreholes and 100m depth per borehole. Operation efficiency of the system shows that, COP increased from 3.0 to 4.2 with entering water temperature in heating operation, however, COP decreased from 5.0 to 3.7 in cooling operation. Economic estimation was analyzed by LCC (Life Cycle Cost) method and it showed that GSHP could save 68% of cost compare to the conventional oil source. Thus, despite of the large amount of initial cost, GSHP has a economic advantage to the other energy sources.
Comparative Study on the Ocean Disposal Methods of Carbon Dioxide
Kim Nam-Jin ; Kim Chong-Bo ;
Journal of Energy Engineering, volume 13, issue 4, 2004, Pages 301~310
Carbon dioxide ocean disposal is one of the promising options to reduce carbon dioxide concentration in the atmosphere. So, in the present study, calculations of the solubility, the surface concentration and the dissolution behavior of carbon dioxide when liquid carbon dioxide is released at 1,000m and 1,500m in depth are performed. The results show that liquid carbon dioxide changes to carbon dioxide bubbles around 500m in depth, and the hydrate acts as a resistant layer for the dissolution of liquid carbon dioxide. Also. the injection of liquid carbon dioxide from a moving ship is more effective than that from a fixed pipeline.
A Study on Combustion Characteristics of the Methane-Hydrogen Lean Mixture by Using Multiple Spark Capacity Discharge in a CVCC (II)
Kim Bong-Seock ;
Journal of Energy Engineering, volume 13, issue 4, 2004, Pages 311~318
In the present study, the combustion characteristics of methane and hydrogen-supplemented methane as alternative fuels for automotive vehicles were investigated at various hydrogen substitution rate, ignition position and ignition methods in a CVCC. The main results obtained from the study can be summarized as follow. In case of center ignition and neat methane-air mixture, the flame propagation processes are propagated with an elliptical shape, but they are changed an instable elliptical shape flame with very regular cells and higher velocity by increasing the hydrogen supplement rate. In case of side, 0.5R ignition and neat methane-air mixture, the flame propagation processes are propagated with an instable elliptical shape flame, but they are changed from an instable elliptical shape to wedge shape flame with very irregular cells and higher velocity by increasing the hydrogen supplement rate. Although the flame propagation shape with ignition position and ignition devices was not differ, the flame area of MSCDI device was a little larger than it of CDI device at the same time.