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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
Editor in Chief :
Volume & Issues
Volume 18, Issue 4 - Dec 2009
Volume 18, Issue 3 - Sep 2009
Volume 18, Issue 2 - Jun 2009
Volume 18, Issue 1 - Feb 2009
Selecting the target year
Determinants of Technological Level in Korean Energy Industry
Lee, Chang-Soo ; Yoon, Seong-Pil ; Park, Jung-Gu ;
Journal of Energy Engineering, volume 18, issue 2, 2009, Pages 75~86
This paper studies examines the R&D efficiency in Korean energy industry by making multiple logistic regression of the product technological level with firms' endogenous technological efforts and cooperations for R&D between upstream and downstream firms. The technological level of Korean energy industry is analyzed to have been positively influenced by economy of scale effect and cooperations for R&D between upstream and downstream firms, but negatively impacted by firm size, and not impacted by competitive market structure, R&D investment, and R&D manpowers. The implications of this study are as follows: i) to heighten the technological level, domestic market would be transformed to be more competitive; ii) Korean Energy industry should make efforts intensifying R&D-related manpowers and investments; iii) although the firm size is analyzed to have negative impact on technological level, firms, lager or smaller, must be supported to accumulate technological capabilities; iv) R&D-cooperating efforts between upstream and downstream firms on the value-chain should be supported.
Solid-liquid 2phase flow in a concentric annulus with rotation of the inner cylinder
Kim, Young-Ju ; Han, Sang-Mok ; Woo, Nam-Sub ; Hwang, Young-Kyu ;
Journal of Energy Engineering, volume 18, issue 2, 2009, Pages 87~92
An experimental investigation is conducted to study a 2-phase vertically upward hydraulic transport of solid particles by water and non-Newtonian fluids in a slim hole concentric annulus with rotation of the inner cylinder. Rheology of particulate suspensions in viscoelastic fluids is of importance in many applications such as particle removal from surfaces, transport of proppants in fractured reservoir and cleaning of drilling holes, etc. In this study, a clear acrylic pipe was used in order to observe the movement of solid particles. Annular velocities varied from 0.3 m/s to 2.0 m/s. The mud systems included fresh water and CMC solutions. Main parameters considered in the study were inner-pipe rotation speed, fluid flow regime and particle injection rate. A particle rising velocity and pressure drop in annulus have been measured for fully developed flows of water and of aqueous solutions. For both water and 0.2% CMC solutions, the higher the concentration of the solid particles is, the larger the pressure gradients become.
Exergy Analysis of Regenerative Wet-Compression Gas-Turbine Cycles
Kim, Kyoung-Hoon ; Kim, Se-Woong ; Ko, Hyung-Jong ;
Journal of Energy Engineering, volume 18, issue 2, 2009, Pages 93~100
An exergy analysis is carried out for the regenerative wet-compression Brayton cycle which has a potential of enhanced thermal efficiency owing to the reduced compression power consumption and the recuperation of exhaust energy. Using the analysis model, the effects of pressure ratio and water injection ratio are investigated on the exergy efficiency of system, exergy destruction ratio for each component of the system, and exergy loss ratio due to exhaust gas. The results of computation for the typical cases show that the regenerative wet-compression gas turbine cycle can make a notable enhancement of exergy efficiency. The injection of water results in a decrease of exergy loss of exhaust gas and an increase of net power output.
Combustion Characteristics of Single Droplet of Diesel with Bio-diesel for Their Mixing Ratios and Sizes
Jeong, Man-Seok ; Lee, Kyung-Hwan ;
Journal of Energy Engineering, volume 18, issue 2, 2009, Pages 101~107
The combustion characteristics of a single droplet of diesel and bio-diesel have been investigated experimentally with varying droplet size, ambient temperature and compound ratio in a high temperature chamber. The fuels used were diesel with bio-diesel contents varied from 0% to 100%. Each experiment has been performed from 970K to 1070K by 50K intervals. Imaging with a high-speed digital camera was adopted to measure the ignition delay and flame life-time, as well as to observe micro-explosion behavior. The increase of droplet size and decrease of furnace temperature cause an increase of the ignition delay time. As the bio-diesel content decreases, the ignition delay increases and the micro-explosion behavior is strengthened. It is also confirmed that the full combustion time decreases as the micro-explosion occurred.
Heat Flow of Round Jet Impinging Aluminum Foam Mounted on the Heated Plate with Constant Heat Flux
Han, Young-Hee ; Lee, Kye-Bock ; Lee, Chung-Gu ;
Journal of Energy Engineering, volume 18, issue 2, 2009, Pages 108~113
An experimental study of jet impingement on aluminum foam mounted on the surface with constant heat flux is conducted with the presentation of the heat transfer rate measured when jet impinges normally to a flat plate. Effects of pore density, foam thickness and Reynolds number on the heat transfer are analyzed. Experimental results show that the significant enhancement in Nu is obtained when the aluminum foam is mounted on the heated plate and that the increase in the heat transfer due to the porous material insertion is dominated by both the increase in the heat transfer area and the decrease in the momentum flux resulted from the pressure drop.
The Effect of the Demand Forecast on the Energy Mix in the National Electricity Supply and Demand Planning
Kang, Kyoung-Uk ; Ko, Bong-Jin ; Chung, Bum-Jin ;
Journal of Energy Engineering, volume 18, issue 2, 2009, Pages 114~124
The Ministry of Knowledge and Economy (MKE) establishes the Basic Plan for Long-Term Electricity Supply and Demand(BPE) biannually, a governmental plan for the stable electricity supply. This study investigated the effects of the electric demand forecast on the energy mix. A simplified simulation model was developed, which replaces the WASP program developed by the KPX and verified by comparing both results. Three different electric demand scenarios were devised based upon the 2005 electric demand forecast: Proper, 5 % higher, and 5% lower. The simplified model calculates the energy mix for each scenario of the year 2005. Then it calculates the energy mix for the proper electric demand forecast of the year 2007 using the energy mixes of the three scenarios as the initial conditions, so that it reveals the effect of electric demand forecast of the previous BPE on the energy mix of the next BPE. As the proper electric demand forecasts of the year 2005 and 2007 are the same, there is no change in the previous and the next BPEs. However when the electric demand forecasts were 5% higher in the previous BPE and proper in the next BPE, some of the planned power plant construction in the previous BPE had to be canceled. Similarly, when the electric demand forecasts were 5% lower in the previous BPE and proper in the next BPE, power plant construction should be urgently increased to meet the increased electric demand. As expected the LNG power plants were affected as their construction periods are shorter than coal fired or nuclear power plants. This study concludes that the electric demand forecast is very important and that it has the risk of long term energy mix.
A Study on Molecular Dynamics Method for Improving Characteristics of Ion Implantation
Yang, Young-Joon ; Lee, Chi-Woo ;
Journal of Energy Engineering, volume 18, issue 2, 2009, Pages 125~131
Physical characteristics of metals such as hardness, wear-resistance and corrosion-resistance can be artificially controlled by ion implantation. The interaction between ion and solid surface was modeled in molecular scale and simulated by the molecular dynamics method in order to understand the ion implantation mechanism. From the microscopic point of view, the molecular behaviors were observed for improving characteristics of ion implantation. For these purposes, the implantation mechanism and the influences of incident energy, surface temperature and molecular weight were discussed in this study. As the results, the penetration probability was even decreased if incident energy was exceeded any values in the case of high temperature of solid surface. Moreover, it was confirmed that ion implantation into solid surface with amorphous state could be more effective for some conditions.
Estimation for CDM of Power Generation by using Bio-diesel
Hur, Kwang-Beom ; Park, Jung-Keuk ; Rhim, Sang-Kyu ; Lee, Jung-Bin ;
Journal of Energy Engineering, volume 18, issue 2, 2009, Pages 132~135
Development of biofuels like ethanol and biodiesel for commercial uses is a recent phenomenon. However, the growth of ethanol and biodiesel has been impressive during the period 2000-2007yr. Globally, production of biodiesel stands around 8.3 billion liters. Europe leads the world in biodiesel production with 80% share of the global biodiesel production total. Today biodiesel fuels have been in commercial use in many countries and recently the world-wide biodiesel market has experienced considerable growth, which is partly due to various tax concession programs and other financial incentives. In Korea, biodiesel has already been used for transportation fuel, but not used for power generation fuel yet. Korean government has a strategy for renewable energy propagation, especially the goal of power generation amount by renewable energy is 3% of total power production by 2012. This paper focuses on the estimation study for effect of using biodiesel as power generation fuel. The study also has the plan to replace the fuel of thermal power plant, gas turbine and distributed power generation system. As the increase of biodiesel fuel, I look forward to environment-friendly power generation and the strategy of Renewable Portfolio Standards(RPS).
An experimental study for combustion stability by operating conditions in a gasoline engine at idle
Han, Sung-Bin ; Kim, Sung-Mo ;
Journal of Energy Engineering, volume 18, issue 2, 2009, Pages 136~140
Vehicle idle has become an increasing quality concern for automobile manufacturers because of its impact on customer satisfaction. As demand for better fuel economy increases, automobile manufacturers are continuously looking for any benefits from different driving conditions. Combustion variability in spark ignition engines was recognized that the stability of engine at idle is affected by the factors of fuel injection timing, ignition timing and air-fuel ratio. Therefore in this research, the results will be shown the effects of stability and the variations at idle according to fuel injection timing, ignition timing and air-fuel ratio as the basic parameters.
Hydrogen storage of multiwall carbon nanotube decorated with bimetallic Pt-Pd nano catalysts using thermal vapor deposition
Hwang, Sang-Woon ; So, Chang-Su ; Naik, Mehraj-Ud-Din ; Nahm, Kee-Suk ;
Journal of Energy Engineering, volume 18, issue 2, 2009, Pages 141~146
In present work, we study the hydrogen storage of MWNT decorated with bimetallic Pt and Pd nanosize catalysts by Thermal Vapor Deposition [TVD]. The size of Pt and Pd particles is controlled as 5nm, 3nm, respectively by TVD. Before hydrogen storage measurement, the sample was heated for 1hr at
in H2 atmosphere. The Hydrogen sto rage of the sample was performed at room temperature and 33~34atm. The hydrogen storage of this composite showed 3.2wt% at 298K and 34atm, for three times. At 4th cycle, hydrogen storage is decreased to 1.5wt%, owing to the aggregation of bimetallic Pt and Pd nano particles.