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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 2, Issue 3 - Dec 1993
Volume 2, Issue 2 - Sep 1993
Volume 2, Issue 1 - Apr 1993
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The Principles and Applications of Fluidized Bed Reactor with a Draft Tube
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 1~15
Assessment of Phosphoric Acid Fuel Cell Technology
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 16~21
Power generation technology utilizing fuel cell becomes an area of technological interest due to its superior characteristics such as energy saving and environmental-friendliness. Major emphasis is put un phosphokric acid fuel cell technology in this paper. Current technological status and commercialization effort of phosphoric acid fuel cell are assessed along with the future developmental issues.
A Study on the Analysis of Energy Demand Behavior in the Transportation Sector
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 22~27
This paper designed to identify energy demand behavior which are employed price: expenditure, traffic activity, and fuel substitution effect in the transportation sector. According to analysis, we find that first of all in this sector, enhancement of fuel economies and improvement of public transportation system are quite significant.
A Study of MMS Computer Program for Dynamic Analysis of Power Plant
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 28~37
This paper describes the development of a dynamic model of 1,000 MW
e/ nuclear power plant including its local and integrated control system. The model was constructed using the Modular Modeling System (MMS) developed by the Electric Power Research Institute (EPRI) to provide an efficient, economical and user-friendly computer code for use in the analysis of the dynamic performance of nuclear and fossil power plants in conjunction with the Advanced Continuous Simulation Language (ACSL). Steady state for full load and transient results for turbine power step changes of loft are presented in this paper. The model includes most major components of a 1,000 MW
e/ nuclear power plant and it can readily be modified to simulate a specific power plant. This procedure greatly reduces the analysis and modeling efforts involved in dynamic simulation of power plants and increases confidence in the analysis results.
The Performance Analysis of Direct Current Electromagnetic Propulsion in Seawater
Kong, Yeong-Kyung ; Park, Tai-In ; Kim, Yun-Sik ; Noh, Chang-Joo ;
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 38~44
Electromagnetic seawater thrusters may be classified into four general categories : internal duct dc, external field dc, internal peristaltic ac, and external peristaltic ac. Internal duct dc thrusters offer the advantages of low magnetic field leakage, simple construction, and potentially high reliability. The most efficient internal duct configuration consists of converging inlet nozzle and a straight discharge duct. Ideal efficiency calculations based on the one-dimensional Bernoulli equation show that thrusters should be designed with large cross-sectional areas and operate at low discharge velocities. In practice, this may be accomplished by using multiple thruster ducts. Conductivity enhancement, high magnetic fields, and long electrodes will also improve efficiency.
A Study on Prioritizing and Evaluating R & D Alternatives for Fuel Cell Technology
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 45~53
This study was directed to an inquiry into a methodology for prioritizing and evaluating R & D alternatives for fuel cell technology, that can provide information for use in future decisions under the current uncertainty. A case study was performed for three cases of fuel cell development under the assumption that basic input data are same. The three cases are the case considering sequential R & D schedule only(Case 1), the case considering equivalent and excluding subprojects(Case 2), and the case allowing parallel efforts for each phase(Case 3). The following results were obtained; the probabilities of success for R & D phases in parallel projects are correlated, the probability of success for each project increases through Case 1, Case 2 and Case 3 successively and the expected dates of commercialization were notably shortened in Case 3.
A Study for the Advanced Design of Rotary Kiln Incinerator III : 3-Dimensional CC1
Gas-phase Turbulent Reaction Model
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 54~67
Two turbulent reaction models of the premixed CC1
/air mixture are successfully incorporated in a 3-dimensional computer program and is applied for Dow Chemical incinerator equipped with two main off-center burners. The first reaction model is fast chemistry model(model 1), in which chemical reaction is governed by the turbulent mixing itself. And the second one is nonequilibrium model(model 2), where the effect of the chemical kinetics due to the presence of CC1
is considered by the incorporation of the burning velocity data of CC1
. The second model not only shows the flame inhibition trend due to the presence CC1
compound, but also predicts qualitatively the vortical stratification of the CC1
concentration appeared experimentally at the kiln exit. Other comparisions of two models are made in detail.
Extraction of Deasphalted Oil from Vacuum Residue
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 68~74
In order to maximize the utility of vacuum residue, supercritical solvent extraction technique where n-pentane was used as a supercritical solvent was applied to obtain deasphalted oil from vacuum residue. Oil-extraction yield at various temperatures and pressures and the contents of metal complex and sulfur of extracted oil were investigated. In supercritical state, extraction yield of deasphalted oil was found to be strongly dependent on the n-pentane density, and the metal complex content of extracted oil was effectively lowered when compared with that of vacuum residue. However, the sulfur content of extracted oil showed little difference when compared with that of vacuum residue.
Simulation of a 50 ㎾ Phosphoric Acid Fuel Cell System Using Natural Gas
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 75~82
A 50 ㎾ phosphoric acid fuel cell(PAFC) system using natural gas was simulated for steady state with the commercial software, ASPEN PLUS. The USER block and the FORTRAN block were prepared to simulate the cell. The changes of hydrogen yield according to the variation of several operating conditions were examined and the operating conditions to maximize hydrogen yield were obtained. The simulation results agree with the real data, which can be used to prepare the basic process data and the optimal conditions for the domestic commercial fuel cell system. H
utilization rate over 50% should be maintained to achieve the efficiency of the conventional electricity generation. Energy consumption can be reduced by utilizing the heat released from the reformer and the cell which are operated at high temperatures.
Energy Analysis of A Combined Heat and Power Plant
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 83~94
In this paper, the performance of an energy conversion system is analyzed using two efficiency concepts, one of conventional and the other of energetic efficiently. The objective of this analysis was to improve and optimize the energy conversion system in point, namely, and LNG-fired Combined Heat and Power Plant (CHP). To this end, energies which represent the true efficiency figures were evaluated for various flows of the system with a set of system configurations given. Then the economic values of the energies were assigned to respective flows and subsystems. With these economic data locations of inefficiencies and opportunities for improvement are identified.
Thermodynamic Performance Analysis of Heat Pump Using Thermoelectric Semiconductor
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 95~103
A conceptual thermoelectric heat pump(cooling mode) of small capacity is designed. Its performance is investigated through parametric analysis. COP and cooling capacity decease as the ambient temperature increases with
, J, T
wi/, fixed. To design a system of fixed capacity comes to calculate
and J when T
wi/, and T
a/ are given. As v is fixed by semi-conductor manufacturers, optimum combination of n and I should be searched for ν. Optimum current could be calculated using
-J curve and optimum value of
R/ increases as water flow rate increases and T
a/ decreases. The effect of heat transfer coefficient at hot(heat releasing) side is more significant than that at cold(heat absorbing) side.
The Development of Battery Energy Storage System
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 104~113
Due to steady increase of electric power demand and decrease of load factor, the economic and reasonable operation of electric power system is necessary. Because of this reason, dispersed battery energy storage system(BESS) with fast response is receiving attractive attention. With these considerations, 20 kVA BESS is designed and tested to investigate the possibility of BESS application to power system. This paper describes the design specifications of simulator and test results. BESS is composed of batteries, conversion equipments, interconnecting equipments to power system, and control parts of the system. The inverter of BESS can carry out two functions as charger and discharger. Also, it can operate as a VAR compensator by four quadrant operation. Since this system is designed as a simulator of MW system, the conceptual design of MW system is possible by using the test result of test system The study of BESS is preliminary stage for the future MW class BESS.
Effects, of Catalyst Pore Structure on Reactivity in Simplified Reaction System
Rhee, Young-Woo ; Son, Jae-Ek ;
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 114~122
A model describing the reaction rate and catalyst deactivation in a simplified reaction system was developed to investigate the significance of catalyst pore structure in terms of porosities, porosity ratios, and size ratios of reactants to pores. The model showed that the unimodal catalyst could give a better performance than the bimodal in certain circumstances and the crossover found in the reactivity curves resulted from a trade-off between surface area and diffusivity. Under the assumption of uniform coke buildup, the bimodal catalyst appeared to provide better resistance to deactation than unimodal catalyst.
Computer Simulation of the Effect of Pressurized/Depressurized Distillation Process on the Reduction of Separation Energy of Ethanol from Alcohol Fermented Broth
Journal of Energy Engineering, volume 2, issue 1, 1993, Pages 123~132
This work is focussed on the reduction of ethanol separation energy from alcohol fermented broth and categorized into the development of a computer program for the design of the pressurized/depressurized distillation process which has been regarded as one of the energy-reducing models for the conventional distillation process, the optimization of operating conditions of distillation towers by means of the developed program, and the evaluation of the total annual energy cost of pressurized/depressurized distillation columns compared with that of the conventional single distillation columns. The operating pressures are, in case of pressurized/depressurized distillation, 3103/760 mmHg, 3103/450 mmHg, 3103/160 mmHg, and in case of conventional distillation, 760 mmHg. The optimum reflex rations which the sum of the annual energy cost and the annual fixed cost for each process becomes minimum are 3.7475/2.9111 for the operating pressures of 3103/760 mmHg, 3.814/2.9712 for 3103/450 mmHg, 3.0783/2.2400 for 3103/150 mmHg, and 3.8544 for the atmospheric operating pressure. And the annual energy cost of pressurized/depressurized distillation process for the above-mentioned operating pressures is distributed between 42% and 47% of that of conventional distillation process.