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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 11, Issue 4 - Nov 2002
Volume 11, Issue 3 - Sep 2002
Volume 11, Issue 2 - Jun 2002
Volume 11, Issue 1 - Mar 2002
Selecting the target year
A Performance Analysis of Gas Turbine Using Low Caloric Value Syngas Fuel
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 187~193
IGCC (Integrated Gasification Combined Cycle) power plant is becoming more attractive because it allows that various fuels like coal, heavy oil md even residue oil and wood are used in a gas turbine. This paper presents a prediction of performances of gas turbine when low caloric value syngas fuels produced from the IGCC is used in it originally designed with natural gas fuel. Using a systemic method which predicts a gas turbine behavior with limited design data, when natural gas, design fuel and four other types of syngas are used in GE 7FA gas turbine, its performances are predicted on design and off-design conditions.
Development and Application of Power System Stability Analysis Program Using OOP
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 194~202
In this paper, we simulate the power system transient stability of Kwang Yang steel works using object-oriented programming (OOP). OOP is a more flexible method than procedural programming. There are several advantages in dynamic system simulation using OOP, The maintenance and repair of program are easy because it is sufficient to modify necessary parts which correspond to the change of system without overall change of program. We have implemented a graphical man-machine interface (MMI) that can be used draw one-line system diagram and analyze power flow and dynamic stability. The implemented MMI also provide a graphical viewer that display dynamic stability analysis results by mouse event handling. The proposed method have been applied to Kwang Yang steel works network for on-line dynamic stability analysis. The dynamic behaviour of 17 synchronous generators and 25 synchronous motors has been studied in the Kwang Yang network.
An Experimental Study on the Development & Application of E-EGR Valve for Light Duty Diesel Vehicle
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 203~209
In this study the characteristics of E-EGR valve developed by Unick were analyzed and the feasibility of application to vehicles were evaluated. Smart car (3
/100 km) and engine which is small-displacement size, 0.8-liter, of diesel passenger car developed from Mercedes-Benz were used for this experiment. It was installed a 3-cylinder turbo-charged light duty diesel engine with an electronic EGR valve. After the analysis and comparison of E-EGR valve performance under test benches, the estimation of vehicle application was executed through the EGR map and CVS-75 test result measured on the chassis dynamometer.
A Study on Economic Analysis for Hotel Introduction of Co-generation System
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 210~215
In respect of global environment protection and efficient utilization of energy, co-generation systems, which have greatly higher efficiency than the other generations, have been developed and put to practical use. Assuming that the co-generation system would be operating in Park Hotel, this paper calculates the difference between the heat and electricity rates by the conventional method and the co-generation system, considers the cost of new investment and analyzes introduction economics based on the return on investment. The introduction is turned out to be recommendable, since the return of investment for co-gen oration equipment is about ten years when the co-generation profits in heat and electricity rate. Additionally, accounting for interest rate drop, improvement of environmental matters or electricity rate increase, it is shown to be even more economical.
A Study on the Protection Method with Interconnection of Wind-Power Generation System
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 216~223
Generation facilities of the power system are mainly classified into large-scale concentrated generation and small-scale dispersed generation, but generation planning of the Korea power system has been focusing on the large-scale generation so far. Recently, however, applications of dispersed generation sources including solar cell, fuel cell, wind power, etc. have been rapidly increasing and being strongly promoted, and such generation sources should be comprehensively considered in both planning and operating. Since it is not always possible that the dispersed generation alone meets all the load interconnected to it is especially when a fault occurs, interconnection into the existing utility is desirable and recommended. In relation to wind power generation systems interconnected at the low and extra high voltage levels, this paper performs the simulation and analysis of the system protection and suggests protection coordination plans on various faults which possibly occur.
Study of Nozzle Characteristics on Clinker Formation in a CFBC Boiler with CFD Calculation
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 224~229
During the operation of Circulating Fluidized Bed Combustion Boiler, defluidization is mainly caused by the formation of clinker. The clinker is made of components of Si, Fe, Ca, etc. However, although the defluidization is widely researched, the major factor has not been validated yet clearly. In this study, in the view of the shape and the arrangement of nozzles at a distributor (type 1, type 2), the formation of clinker is examined by CFD calculations and an improved nozzle design is proposed.
The Development of Prototype Synchronized Phasor Measurement Device for Real-time Power System Monitoring
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 230~236
In real-time power system control, it is essential to measure the power system variables which are voltage, current, real and reactive power, power factor, system frequency and etc. These variables can be estimated or calculated by the synchronized phasor informations of voltage and current. Therefore, the synchronized phasor measurement of voltage and current is very important to real-time power system control. So, we develop SPMD (Synchronized Phasor Measurement Device) for synchronized phasor measurement of voltage and current. In this paper, we present the design and implementation of SPMD for real-time phasor measurement and the test results of developed SPMD on 380 V 3 phase distribution line in laboratory with resistor load and RTDS (Real Time Digital Simulator).
Numerical Simulation on the Behavior of Air Cloud Discharging into a Water Pool
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 237~246
If the safety depressurization system of APR-1400, the Korean next generation reactor, is in operation, water, air and steam are successively discharging into a in-containment refueling water storage tank through spargers. Among the phenomena occurring during the discharging processes, the air bubble clouds produce a low-frequency and high-amplitude oscillatory loading, which may result in the most significant damages to the submerged structures if the oscillation frequency is the same or close to the natural frequency of the structures. The involved phenomena are so complicated that most of the prediction of frequency and pressure loads has been resorted to experimental work and computational approach has been precluded. This study deals with a numerical simulation on the behavior of air bubble clouds discharging into a water pool through a sparger, by using a commercial thermal hydraulic analysis code, FLUENT, version 4.5. Among the multiphase flow models, the VOF (Volume Of Fluid) model was selected to simulate the water, air and steam flows. A satisfactory result was obtained comparing the analysis results with the ABB-Atom test results which had been performed for the development of sparser.
A Study of Regeneration Reaction for Desulfurization Sorbents using Natural Manganese Ore
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 247~253
Natural manganese ore was selected as main active component for a non-zinc desulfurization sorbent used in the gas clean-up process of the integrated gasification combined cycle (IGCC) because of excellent H
S removal efficiency and economical aspect . In this study, the regeneration characteristics of sorbent after desulfurization reaction were determined in a thermobalance reactor and a fixed bed reactor in the temperature range of 350~55
. The mixed gases of oxygen and nitrogen are used as the regeneration reaction gases for manganese sorbent. According to Mn-S-O phase diagram, the manganese sorbent has a low regeneration efficiency in medium temperature due to formation of MnSO
and the regeneration temperature must be over 85
. To improve that problem, ammonia and steam was added in regeneration mixed gases. Effect of new regeneration method was determined by XRD and difference of desulfurization through multicycle tests.
Characteristics of the Multi-kW Class Polymer Electrolyte Membrane Fuel Cell Stack for a Hybrid Electric Golf Cart
I.H. Oh ; S.J. Shin ; J.H. Jo ; Park, S.K. ; H.Y. Ha ; S.A. Hong ; S.Y. Ahn ; Lee, Y.C. ; S.A. Cho ;
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 254~261
The fabrication method for the main components of the polymer electrolyte membrane fuel cell stack such as electrodes, membrane-electrode assemblies, and bipolar plates was established for the effective electrode area of 240 ㎠. A counter-flow type 100-cell stack was fabricated by using the above components and then a maximum power of 7.44 kW for H
and 5.56 kW for H
/air could be obtained at 70
and 1 atm. It was seen that the distribution of the OCV for unit cells in the stack was uniform but the voltage deviation increased as the load increased due to the IR drop and the electrode polarization. The stack was applied to the power source of the fuel cell/battery hybrid electric golf car. It produced about 1 kW at a room temperature operation during the test run, which occupied about 43% of the total power required by the 2.3 kW motor.
Acoustic Enhancement of Solid-Liquid Phase Change Heat Transfer
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 262~268
The present paper investigated the effect of ultrasonic vibrations on the melting process of phase-change materials (PCM). Furthermore, the present study considered constant heat-flux boundary condition, whereas many of the previous researches had adopted constant wall-temperature condition. The results of the present study revealed that ultrasonic vibrations accompanied the effects like acoustic streaming, cavitation, and thermally-oscillating flow. Such effects are a prime mechanism in the overall melting process when ultrasonic vibrations are applied. They speed up the melting process as much as 2.5 times, compared with the result of natural melting. Also, energy can be saved by applying ultrasonic vibrations to the natural melting. In addition, temperature and Nusselt numbers over time provided a conclusive evidence of the important role of ultrasonic vibrations on the melting phenomena.
Behavior of Sulfur-containing Compounds in High Temperature Pyrolysis of Coals
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 269~275
Experimental studies are carried out to find the behavior of sulfur compounds which are evolved during high temperature pyrolysis of coals at the smelting reduction process for iron ore. Three kinds of bituminous coals, such as Hunter & Mt. Thorley (Australia), and Ensham (South Africa) are used. And forms of sulfur compound and their amounts are analyzed at the temperature ranges of 800~110
. Then H
S is the major gas, but CS
and COS are minor gases. Sulfur compounds in three coals are distributed into the volatiles (gas & tar) and coal char as the ratio of approximately 50%：50%, respectively.
An Experimental Study on the Energy Separation in the Geometric Setup of a Low Pressure Vortex Tube
Journal of Energy Engineering, volume 11, issue 3, 2002, Pages 276~282
The process of energy separation in a low Pressure vortex tube with compressed air as a work-ing medium is studied in detail. Experimental data of the temperature of the cold and hot air leaving the vortex tube are presented. The variation of the maximum wall temperature along the inner surface of the vortex tube and the temperature distribution in a vortex tube provide useful information about the location of the stagnation point of the flow field at the axis of the vortex tube. Analysis of the results enabled to find the optimum length of the vortex tube, the optimum shape of the Throttle and the usefulness of the Sleeve. In this study Outer tube is used for the exhaust application. The hot gas flow is turned 180
and passes the out-side of the vortex tube a second time heating it. From this geometric setup of a vortex tube He effects of energy separation and the prediction of the ignition of Diesel Soot is presented by experimental data.