Go to the main menu
Skip to content
Go to bottom
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 8, Issue 4 - Nov 1999
Volume 8 - Sep 1999
Volume 8, Issue 2 - Jun 1999
Volume 8, Issue 1 - Feb 1999
Selecting the target year
A Study on the Globalization Policy of the Korean Nuclear Industry
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 203~212
The Republic of Korea is actively constructing and operating nuclear power plants and will maintain the nuclear energy program in spite of the current stagnation of nuclear industries in advanced countries. The significant role of Korea in the world economy is well recognized as Korea became a member of OECD. The Korean economy is rated as the eleventh largest in the world. Korea is a very important customer in the world nuclear market and is also regarded as a potential future supplier. However, the domestic and international environment for globalization of the Korean nuclear industry is not well established. This is mainly due to the past nuclear policy which has emphasized technological self-reliance with less attention to the international politics and trading. Under this background, this paper suggests the strategies for promoting the nuclear trade and expanding the influence in the decision making process of international nuclear community.
A Study on Dynamic Test of Safety System Software on Nuclear Power Plant
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 213~223
In recently, the safety system software of the nuclear power plant has been verified and validated according to ANSI/IEEE-ANS-7-4.3.2-1982 to improve the reliability. This standard requires that safety-related software should be tested in the static and dynamic environments. In case of Inadequate Core Cooling Monitoring System (ICCMS), the static test procedure and related techniques are developed but the dynamic test procedure and related techniques are not developed. Therefore, this paper discusses the undeveloped techniques, and suggests the dynamic test procedure and the program for generation of test input data. The performance of the program was identified using accident analysis report of Ulchin 3&4 Final Safety Analysis Report (FSAR).
Computer Simulation for the Thermal Analysis of the Energy Storage Board
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 224~232
Latent heat storage system using micro-encapsuled phase change material is effective method for floor heating of house and building. The temperature profile in capsule block and flow rate of hot water are important parameters for the development of heat storage system. In the present study, a mathematical model based on 3-D, non-steady state, Navier-Stokes equations, scalar conservation equations and turbulence model (
), is used to predict the temperature profiles in capsule and the velocity vectors in hot water pipe. The multi-block grids and fine grids embedding are used to join the circle in hot water pipe and square in capsule block. The phase change process of the capsule is quite complex not only because the size of phase change material is very small, but also because phase change material is mixed with the cement to form thermal storage block. In calculation, it's assumed that the phenomena of phase change is limited only the thermal properties of phase change material and the change of boundary is not happened in capsule. The purpose of this study is to calculate the temperature profiles in capsule block and velocity vectors in hot water pipe using the numerical calculation. Two kinds of thermal boundary condition were considered, the first (case 1) is the adiabatic condition for the both outside surfaces of the wall, the second (case 2) is the case in which one surface is natural convection with atmosphere and another surface is adaibatic. Calculation results are shown that the temperature profile in capsule block for case 1 is higher than that for case 2 due to less heat loss in adaibatic surface. Specially, in the domain of near Y=0, the difference of temperature is greater in case 1 than in case 2. The detailed experimental data of capsule block on the temperature profile and the thermal properties such as specific heat and coefficient of heat transfer with the various temperature are required to predict more exact phenomena of heat transfer.
Development of a Large-Scale Hot Water Production System Using a Natural Circulation Loop
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 233~241
A large-scale hot water production system using a natural circulation loop was developed. A computer simulation program was developed to design and evaluate thermal performance of the natural circulation system for hot water production. An experimental apparatus was set up and was tested against various conditions to exhibit a stable operating region of the natural circulation loop. When the system was a stable state for heating rate (695 ㎾) and feed water was circulated at 0.3
/s constantly. A unstable state was checked by experiment and that time flow rate was oscillated with 0.4∼0.6
/s. The result showed that the program can predict the thermal performance of the large-scale hot water system using the natural circulation loop and can be utilized to design the system.
A Study on the Characteristics of Waste Heat from the Industrial Complexes for Residential and Commercial Sectors
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 242~247
The characteristics of waste heat effluents from 11 industrial complexes of 7 areas were analyzed to investigate the possibility of waste heat recovery of huge amount of waste heat producing from various industrial complexes. This study presents a part of the research work for the industrial waste heat for development of energy integrated network system in broad city area, which will utilize industrial waste heat for residential and commercial areas, where they are located at some distances from the complexes. The amount of waste heat from the investigated complexes was detected as 148,913 TOE/year. However, It was analyzed 83% of the waste heat was analyzed the temperature range from 0
. Also, it was evaluated that 82% of waste heat was exhausted by flue gases. Especially, the characteristics of waste heat for the areas where most heat concentrated, such as Tae-gu industrial complex, Ul-san petrochemitry complex, Yio-chun petrochemistry complex, and Chun-ju industrial complex were investigated more precisely. Total amount of waste heat discharged from these four areas were analyzed 114,402 TOE/year, which was occupied as 77% of the total waste heat for the studied areas, and 87% of the waste heat from the industries was exhausted by flue gaseous phase and temperature range was from 0
18.1 million TOE/year waste heat was released from the fossil fuel power plants, however 95% of waste heat was analyzed as cooling water from surface condensers at power plants. The temperature range was measured from 27
, which are unable to utilize due to its low temperature. Otherwise, 5% (894,800 TOE/year) waste heat released from power plants were observed as flue gas, which temperature ranged from 90
Catalytic Cracking of Pyrolysed Waste Lube-oil Into High Quality Fuel Oils Over Solid Acid Catalysts
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 248~255
Catalytic cracking of pyrolysed waste lubricating oil over solid acid catalysts (HY zeolite,
-zeolite, HZSM-5) has been carried out in a micro-fixed bed system. The feed oil for catalytic activity tests has been prepared by thermal cracking of waste lubricating oil under the reaction conditions of 480
, 60 min. Optimum reaction conditions for the maximum light oil yields(
21/) were WHSV(weight hourly space velocity)=1 at 375
. The amounts of total and strong acid sites appeared to be the largest in
-zeolite as determined by NH
, TPD. It is seen that the catalytic activity order, in terms of the light fuel oil (
21/) production, were HY zeolite)
-zeolite>HZSM-5. Also, coke formation followed the same order. The highest activity in HY zeolite may be attributed from the fact that it has supercages facilitating the easy diffusion of larger molecules and also the effectiveness of the acid sites for cracking within the pore. This fact could be confirmed by the coke formation characteristics.
Effects of Base Metal on the Partial Oxidation of Methane Reaction
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 256~264
The performance of the Pt-B/cordierite catalysts (2 wt%) Pt, 70 wt% Alumina, 28 wt%) Ceria and Zirconia, B: base metal) loaded with 6∼12 wt% Mn, Cu, V, Co, Cr and Ba, respectively was studied for partial oxidation of methane reaction and compared with that of Ni loaded catalyst. As a results, it was found that Ba, Co, Cr as well as Ni loaded catalysts showed higher activity for methane partial oxidation of methane than the Mn, Cu and V loaded catalyst. But it was known that catalysts having good activity for methane showed the good activity for coke formation, too. A XRD analysis of the catalyst before and after the reaction using 5 wt% Ni/Al
) showed that there were three Ni phases. In these results, it was found that methane oxidation reaction occulted at the front of the catalyst bed consisted of NiAl
and NiO and reforming reaction occurred at the rear part of the catalyst bed consisted of reduced Ni.
The Effect of Yearly Purchase Price Pattern in Electricity Transaction Between Utility and IPPs
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 265~271
In recent years, the electric utility industry in Korea has undergone fast change. Private power generation has been introduced by competitive bidding to improve economic efficiency and to strengthen the competitive generation market. In these private generation projects, the yearly pattern of purchase price between the utility and IPPs is very important. Currently, the levelized payment schedule is applied to capacity payment, and price escalation rates are reflected to energy payment. In this paper, we Proposed different patterns of payment and analyzed the outcomes. As a result, we found possibility of applying the partial front-loading pattern in Korean market to share the risk of the long-term business. And, the importance of discount rate is also found.
A Study on the Thermal Enhancement for a Plane Contact Interfaces of Electronic Systems
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 272~278
In the present study, measurements of thermal contact resistance (TCR) were conducted for joints of brass and aluminium cylinders of 30 mm in diameter, 45 mm in length, when their interfaces were; ⅰ) under vacuum, ⅱ) charged with a pure silicone grease and ⅲ) charged with a mixture of silicone grease and powder of aluminium (#325). Also the data were compared with analytical calculations using Fouche's model. The data of TCR for joints under vacuum state varied in the range of (2∼100)
/W) depending on their surface roughness. When the contact surfaces were carefully ground, a reduction of 30∼50% in TCR was obtained. But the surface treatment with silicone grease gave rise to a reduction of about 5∼10 times more than that of vacuum state. The analytical prediction by Fouche's model showed a good agreement within 10~30%, for the case of contact surface charged with silicone grease.
Intrinsic Reactivity of NO and
O gas with Korean Anthracites
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 279~284
Thermal analyses were conducted in a thermogravimetric analyzer by isothermal technique in order to characterize the Korean anthracites-nitrogen oxides reaction. The tested coal sample was Dogae anthracites and compared with SP-1 graphite. Carbon-NO and carbon-N
O reactions were carried out with respect to isothermal reaction temperatures (550
) and reactant gas partial pressures (5 kPa∼20 kPa). In NO reaction, measured reaction orders of NO concentration and activation energy were 0.45∼0.96 and 39∼l12 kJ/mol, respectively. In N
O reaction, measured reaction orders of N
O concentration and activation energy were 0.62∼0.87 and 190∼215.3 kJ/mol, respectively. Compared the Korean anthracites-nitrogen oxides reaction with the combustion reaction, the reaction rate in the oxidation below 700
decreases in the order O
O. But above 700
, the reaction rate of N
O is faster than that of NO.
A Study on the Insulation Design Parameters of the Reactor in the Korean Standard Nuclear Power Plant
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 285~292
The design parameter of the reactor vessel insulation for the Korea Standard Power Plant has been studied numerically. The heat loss from the reactor vessel through the insulation is analysed by using the computational fluid dynamics code, FLUENT. Parametric study has been performed on the air gap width between the reactor vessel wall and the inner surface of the insulation, and on the insulation thickness. Also evaluated is the performance degradation due to the chimney effect caused by gaps between the panels during the installation of the insulation system. From the analysis results, the optimal air gap width and the optimal insulation thickness are obtained.
The Curvature and Shear Effects on the Eddy Viscosity
Lim, Hyo-Jae ;
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 293~297
Direct comparisons are made between curvature-corrected eddy viscosity models and the present experimental data. The results show that the curvature effects can be quantified through a curvature parameter R
c/ or S
c/ and a non-equilibrium value of p/
. The data reveal a significant dependence of the eddy viscosity on the curvature and strain history for a fluid in a stabilizing curvature field, S
c/>1.0. Especially, experimental result shows that the eddy viscosity coefficient ratio at S
c/=3 changes from 10 to -10 although shear rate preserved constant. It is therefore suggested that proper curvature modifications, particularly the strain history effect, must be introduced into current eddy viscosity models for their application to turbulent flows subjected to curvature straining field for a non-negligible period of time.
Experimental Study on Characteristics of Steam Condensation in a Sub-cooled Water Pool
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 298~308
Experimental study on characteristics of direct contact condensation of steam discharged into a sub-cooled water pool has been performed using five different sizes of horizontal nozzle over a wide range of steam mass fluxes and pool temperatures. Steam condensation phenomena have been observed visually and by taking pictures of steam jets using a high speed video camera. Two different steam jet shapes such as ellipsoidal shape and conical shape were typically observed for a stable steam jet, depending on the steam mass flux and pool temperature. The steam jet expansion ratio and the steam jet length as well as the condensation heat transfer coefficients were determined. The effect of steam mass flux, pool temperature, and nozzle diameter on these parameters were also discussed. Empirical correlations for the steam jet lengths and the condensation heat transfer coefficients as a function of steam mass flux and condensation driving potential were established. The axial and radial temperature distributions in steam jet and in surrounding water were measured. The effect of steam mass flux, pool temperature, and nozzle diameter were also discussed. The condensation regime map, which consists of six regimes such as chugging, transient chugging, condensation oscillation, stable condensation, bubble condensation oscillation, and intermittent oscillation condensation, were established. In addition, the dynamic pressures at the pool wall were measured. The close relation of dynamic pressure and steam condensation mode, which is also dependent on steam mass flux and pool temperature, was found.
Numerical Study for the Reacting Characteristics of Orimulsion Gasification
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 309~316
A numerical study for the turbulent reacting flow in an orimulsion gasifier has been carried out to analyze the characteristics of chemical reaction by orimulsion droplets. In this study, our interest has been focused on the effect of oxidizer to orimulsion ratio, which is one of the key parameters of gasification operation, as well as on the distribution of chemical species. In addition, we have conducted numerical calculations to understand the effect of droplet size, spray angle and injection velocity of fuel so as to acquire the basic information on the operating range of orimulsion gasifier. The result of numerical calculations showed that the gas composition of CO and H
concentrations was the highest when the oxidizer to orimulsion ratio was about 0.88 and the reactivity of orimulsion increased as the droplet size reduced with proper spray angle. Also, we have carried out the analysis on the orimulsion gasification in the 100 ton/day-scale gasifier based upon the prior study in order to obtain the basic data for the proper operating condition using orimulsion feed.
A Study on the Alternative Technology Evaluation Based on LCA and ″extended″ Energy I/O Technique
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 317~324
This study suggests the effectiveness of an "extended" power system evaluation methodology based on LCA and energy input-output analysis techniques. This "extended" evaluation methodology is designed to incorporate total energy system costs through fuel cycle and external costs, including CO
abatement cost. As an empirical test, we applied the methodology to orimulsion-fired power generation technology and found that orimulsion could be considered as in attractive base-load power generation fuel in terms of economic and environmental aspects, compared to conventional coal-fired power plant.
A Fundamental Study on Development of a Rotating Horizontal Heat Pipe
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 325~332
When a rotating heat pipe is in operation, liquid condensate returns from the condenser to the evaporator along the inside surface by both components of gravitational and centrifugal forces. It was known that its performance was largely dependent on how to increase the flow rates of condensate and keep the condensate film thickness as thin as possible. Most of research works were focussed on this goal, and various inner wall structures such as tapered wall, stepped wall or coil inserted pipe etc. were developed. In the present study, a stepped wall structure with 3 internal grooves in the condenser and adiabatic zone was examined. For this system, the condensate would flow down to the evaporator through the grooves, resulting a reduced film thickness over the condenser surface. Experimental data showed an enhancement of heat transfer coefficient in the condenser zone. An analytical solution to the condensate film thickness showed that the analytically calculated values of heat transfer coefficient were considerably higher than the experimental data.
An Analytical Study on the Condensation of Submerged Vapor Jets in Subcooled Liquids
Journal of Energy Engineering, volume 8, issue 2, 1999, Pages 333~340
A numerical study of turbulent condensing vapor jet submerged in subcooled liquids has been conducted. A physical model of the process is presented employing the locally homogeneous flow approximation of two phase flow in conjunction with a
-g model of turbulence properties. In this model the turbulence is represented by differential equations for its kinetic energy and dissipation. A differential equation for the concentration fluctuations is solved and a clipped normal probability distribution function is proposed for the mixture fraction. Effects of steam mass flux, pool temperature and nozzle internal diameter on the condensing vapor jet are also analyzed. The model is evaluated using existing data for turbulent condensing vapor jets. The agreement between the predictions and the available experimental data is good.