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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 2, Issue 3 - Dec 1993
Volume 2, Issue 2 - Sep 1993
Volume 2, Issue 1 - Apr 1993
Selecting the target year
The Status of Environment Science and Technology in Korea and its Development Strategies.
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 133~138
Strategy of Technology Development for the production of EtOH as an Alternative Automobile Fuel.
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 139~153
Kalina Cycle : Highly Efficient Bottoming Cycle In Connection With A Combined Power Plant
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 154~170
CANDU Energy System Design and Safety - a Status Review
Meneley, D.A. ;
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 171~178
The CANDU nuclear-electric generating system, developed in Canada beginning in about 1950, has reached full maturity with 22 units operating in other countries, and 13 units under construction, as shown in Table 1. Production and economic performance of modern CANDU units is competitive with other nuclear generating stations in the world. The safety record of these plants is excellent; their level of safety protection against severe accidents is at least equal to that of other commercial designs.
A Study on Design and Performance of a Heat pipe for the Application to Solar Collector
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 179~186
Heat pipes. applied to a flat plate solar collector, have a long and slender configuration with relatively low heat flux in the evaporator section. Such a heat pipe has a tendency to build-up a liquid pool at the lower part of the evaporator section. and at this pool occurs such complicated phenomena of evaporation and fluid dynamics as superheat, sudden generation of bubble, its likely explosive growth process and flooding, etc. In the present study. we tried to solve these problems by means of adjusting two principal design parameters, the liquid inventory and the installation region of the wick, using 4 heat pipes and 3 thermospheres. The corresponding results can be summarized as follows
1)/. The effective thermal conductances of the heat pipe was greatly improved by eliminating the wick in the adiabatic and condenser sections
2)/. The liquid inventory should be increased by about 40% larger than what is saturated the wick
3)/. In the evaporator section the wick has a favorable effect to reduce both unstable operation by intermittent occurrence of nucleate boiling and response time at the initial start-up process.
Manufacture of SiC matrix for PAFC
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 187~193
Porous matrices to contain and support phosphoric acid were prepared with PTFE as binder and SiC whisker or SiC powders of various particle size for phosphoric acid fuel cell(PAFC). Among the matrix characteristics the most important factors in stack performances were thought to be the bubble pressure and electrolyte wettability And then matrix was constructed to have pore size smaller than that of electrode. The bubble pressures and wettabilities of matrices manufactured with various size of SiC and different PTFE contents were investigated and related with the porosities measured by porosimeter, and then the optimum manufacturing condition of matrix for PAFC was determined.
Porous Electrode manufacture by catalyst powdering method for PAFC
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 194~199
Gas diffusion passes are introduced to catalyst layer so as to enlarge reaction region in cathode and anode and then improve electrode performances. The catalyst layer was manufactured with PTFE/carbon (none catalyst loaded) for gas diffusion and Pt/carbon (10 w/o Pt catalyst loaded) by varing the mixing ratio of (PTFE/carbon) to (Pt/carbon) by catalyst powdering method. The electrodes made by mixing Pt(10 w/o)/carbon powders and PTFE/carbon powders containing 60 w/o PTFE at the ratio of 7 : 3 showed the best electrode performances. It was known that by comparing the porosities to electrode performances the electrode performances were increased as both macro pore for gas diffusion and micro pore for electrolyte intrusion were formed much more. The platinum catalyst content in electrode was 0.2 mg/
and the PTFE content was 42 w/o. The electrode performance in unit cell was 220 ㎃/
/0.7 V at operating temperature of 150
Operational Characteristics of Methanol Reformer for the Phosphoric Acid Fuel Cell System
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 200~207
A methanol reformer was designed and fabricated using a CuO-ZnO low temperature shift catalyst, and its operation characteristics have been studied for the phosphoric acid fuel cell (PAFC) power generation system. The type of reactor was annular Methanol was consumed both for heating and for reforming fuel. Contents of carbon monoxide produced from the reformer increased as the reaction temperatures increased, but decreased as the mole ratios of water to methanol(H
OH) increased. At steady state operating conditional, temperature profile of the catalytic reactor of the reformer was well coincide with the model equation, and it took 50 minutes from start to the rated condition of the reformer. When the system was operated at 4/4 and 1/4 of load, thermal efficiencies of the system were 72.3% and 77%, respectively. When the PAFC system was operated with reformed gas in the range of 62 V-37.6 V and 0-147 A, the trend of I-V curve showed a typical fuel tell characteristic. At steady state condition, the flow rates of reforming and combustion methanol were 88.1 mol/h and 50.1 mol/h, respectively.
The Product properties of Bituminous Coal in Two-Stage Pyrolysis
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 208~214
Pyrolysis of bituminous coal has been carried out in a two-stage fixed bed reactor to produce high heating value gas(7000 kcal/N㎥) for industrial or town gas usage. The effects of coke catalyst, pyrolysis temperature (468∼565
), and catalytic cracking temperature (700∼850
) on the product gas properties from pyrolysis of bituminous coal have been determined. From pyrolysis of Dong Jin coal with coke, the carbon deposition on catalyst is found to be less than 5% of product tar and approximately 15% of total energy iii the parent coal can be recovered as high heating value gas. Oil composition in the product tar from the two-stage pyrolysis is higher than that from low-temperature pyrolysis. The tar produced from pyrolysis below 516
can be easily catalytically cracked but, the tar produced above 565
cannot be cracked easily with catalyst. From the product gas analysis, the catalytic cracking temperature should be maintained below 800
since cracking speed of ethylene increases remarkably with the cracking temperature above 800
A Study on Synthesis of Heat Exchanger Network for Heat Recovery
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 215~224
Heat exchanger network synthesis is very useful to aspects of energy recovery and saving. In order to obtain the optimal network structure for minimum utility cost, multiple utilities were used. In this study, the practical matches of process streams were not considered, but only evaluation of targets was demonstrated. The program developed in this work was applied to the alcohol production process and it was possible to find the optimal cost targets.
Isothermal vapor-liquid equilibria of n-Dodecane-1-Decanol, n-Dodecane-1 -Dodecanol and 1-Decanol-1-Dodecanol systems by Head Space Analysis
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 225~230
Isothermal vapor-liquid equilibrium data have been measured for binary systems n-dodecane-1-defanol, n-doderane-1-dodecanol, and 1-decanoi-1-dodecanol at 140
by using head space gas chromatography (H.S.G.C) as a static method. The activity coefficients, calculated taking into acount the nonideality of the liquid phase, were correlated with the conventional g
E/ model, Margules, van Laar, Wilson, NRTL equations. These equilibrium data were thermodynamically consistent by Rrdlich- kister test, among these data, system n-dodecane-1-detanoi has minimum azeotrope.
An Overview of Magnetohydrodynamic Ship Propulsion with Superconducting Magnets
Kong, Yeong-Kyung ;
Journal of Energy Engineering, volume 2, issue 2, 1993, Pages 231~236
The feasibility of Magnetohydrodynamic(MHD) Ship Propulsion using Superconduction Magnets is reviewed in light of relent advances in high-temperature superconducting. The propulsion using a screw propeller in the noise reduction has it's own limitation. The epochal noiseless MHD propulsion method which does not have this disadvantage is studying nowadays. The subject of a marine MHD as propulsion has been examined before and was found to be interesting because of relatively low magnetic flux densities. It is demonstrated that the MHD propulsion is technically interesting with high magnetic flux density. The development of large-scale magnets using the high-temperature superconductor now under development could make it practical to construct submersibles for high-speed and silent operation.