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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
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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
Comprehensive Assessment of Thermal Behavior of Heavy Metal Elements in Coal
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 499~504
A Value-based Real Time Pricing Under Imperfect Information on Consumer Behavior
Kim, Balho H. ; Park, Jong-Bae ;
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 505~511
One of the major challenges confronting a multiservice electric utility is the establishment of the right prices, for its services. The key objectives of particular pricing schemes are reasonableness of company earnings. Economic efficiency, the responsiveness of supply and of the allocation of sources to the desires of consumers, and maintenance of some degree of competition. This paper proposes a value-based pricing mechanism amenable to the current deregulation situation in electricity market allowing service differentiation. The proposed pricing mechanism can be implemented ina nodal auction model, and can also be applied to direct load control.
A Rational Operation Scheduling for Operating Cost Saving in Cogeneration System for Paper Mill
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 512~518
This paper proposed the optimal operational scheduling of cogeneration system for paper mill connected with several auxiliary devices Auxiliary devices that include auxiliary boilers, waste heat boilers and sludge uncinerators operate with multi-cogeneration systems. Especially environment element was considered in objective function to solve environment problem. Electricity can be purchased through power system from utility. The proposed operational strategy on cogeneration system for paper mill to increase energy efficiency can be applied to the similar cogeneration system is industrial field.
Operation Algorithm of Battery Energy Storage System (BESS) for Saving Electric Charges
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 519~524
this paper proposes the operation algorithm of 1MW class Battery Energy Storage System(BESS) installed at the extra-high voltage customer. The objective of the proposed algorithm is to reduce electric charges during the operation of the BESS interconnected to power system. This paper simulates the electric charges in 1998 considering Season and Time of Use Rate and Power Factor in the assumption that electricity demand in 1998 is the same amount of that in 1997 and shows the saving of about 40 million won in the total electric charges. The results comparing the real electric charges of June. July and August in 1997 with that in 1998 show that the implementation of the proposed algorithm could significantly reduce electric charges during the operation the BESS.
A Study of Cooldown Performance of Shutdown Cooling System of Korea Next Generation Reactor
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 525~532
The standardized Korea Next Generation Reactor (KNGR) NSSS has developed in the basis of the ABB-CE System 80+ design concept. In this study, several regulatory requirements for the KNGR shutdown cooling system (SCS) operation are investigated. The purpose of this study is to establish the technical self-reliance for SCS design by supporting fundamental data such as SDCHX effective area and reactor CCW flow rate. Thermal power of KNGR would be increased to about 4,000
in comparison with thermal power 2.825
of UCN 3&4, therefore, SCS design data shall b recalculated by using the KDESCENT Code, which could evaluate cooling capability of SCS. It is found that SCS minimum flow rate is able to remove the primary sensible heat. Reviewing the major components such as heat exchanger, pump, value, and operating procedure, it is concluded as follows.
The Effect of the Integration Methods of Gas Turbine and Air Separation Unit on IGCC Plant Performance
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 533~539
Integration methods of a Gas Turbine and a Air Separation Unit have a potential to improve plant performance and cost of IFCC. Several studies on those integrations schemes were carried out. Then some of the methods were accually in commercial plants. Thus paper reviewed the integration schemes of a Gas Turbine and a Air Separation Unit. In order to compare the plant performance of IGCC with each scheme, simulation model was developed for IGCC power cycle with Texaco Quench gasification process. The simulation results showed that the thermal efficiency of the plant was appeared to be the best when all of the air consumption required for Air Separation Unit was supplied from the Gas Turbine and the net plant power output was maximized when 75% of the total ASU an requirement was supplied from Gas Turbine.
Analysis of Hyperbolic Heat Conduction in a Thin Film
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 540~545
The classical Fourier heat conduction equation is invalid at temperatures near absolute zero or at very early times in highly transient heat transfer processes. In such situations, a hyperbolic equation model for heat conduction based on the modified Fourier law is introduced because the wave nature of heat propagation becomes dominant. The Fourier model and the hyperbolic model for heat conduction are analyzed by using the Green's function technique together with the integral transform. Analytical expressions for the heat flux and temperature distributions in a finite slab subjected to a periodic surface heating at one of its surfaces are presented and the results obtained from each model are compared with each other. The thermal wave implied b the hyperbolic model is shown to travel through a medium and to reflect back toward the origin at the other insulated surface. On the other hand, the heat by the Fourier model propagates at an infinite speed instantaneously after a thermal disturbance is felt throughout the medium.
Development of the Fresh Water Generator
Park, Jun-Seop ;
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 546~552
In order to obtain the highly effective thermal energy from jacket cooling water of propulsion diesel engines. a development of the Fresh Water Generator (FWG) with a capacity of 30 ton/day was implemented. Newly developed experimental devices and data acquisition system were used to evaluate the performance of the FWG. In this study experiments were performed for various driving pressures by varying the mass flowrate of cooling seawater with or without a heat source instead of jacket cooling water.
Experimental Study on the Characteristics of Coal Gasification by 1 T/D BSU Coal-Slurry Entrained Gasifier
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 553~559
This study has been implemented to investigate various characteristics of coals which are imported from abroad. KIER has developed 1 T/D bench-scale unit, entrained-flow coal-slurry gasification technology to investigate the followings: 1) to assess the appropriate foreign coals for gasification. 2) to establish the data base for gasification phenomena, 3) to minimize the technical risks prior to introduction of commercial scaled IGCC power plant, 4) to develop essential key technologies and to establish operational experiences for coal gasification. The foreign coals used in the gasification are Cyprus and Alaska coals from U. S. A. Cyprus coal(bituminous) and Alaska coal (lignite) were shown about 1.29
. The concentrations of coal-slurry for Cyprus were maintained up to 58%, 62% and 65% in order to enable to feed satisfactorily it into the gasifier without any other problems at feeding systems. However, the Alaska coal was unable to maintain slurry concentration over the 60% due to its high viscosity. During the experiments,
ratios in both coals ere maintained from 0.6~1.2, but especially Alaska coal was required excessive oxygen feed due to its high ingerent moisture contents. During the experiments with two different coals, the concentrations of syngas
were shown as 40~62%, and the heating value of syngas were detected as 1,400~2,050 kcal/N㎥
Pressurized Drop Tube Furnace Tests of Global Gasification Characteristics of Coal
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 560~566
PDTF (Pressurized drop tube furnace) experiments using variations of temperature, oxygen/coal ratio, steam/coal and pressure with Roto coal (Sub A) were performed in order to investigate the effects of these experimental parameters on global gasification characteristics at elevated pressure. The results shows that the gasification at elevated pressure is more profitable than that at atmospheric pressure considering the carbon conversion and cold gas efficiency. The oxygen/coal ratio at which maximum cold gas efficiency was appeared ranged from 0.5 to 0.7 g/g. only when the temperature is sufficiently high enough, the raise of steam/coal ratio brings improvement of cold gas efficiency. As the pressure increased, the volume of carbon conversion by heterogeneous reaction increased but the volume of carbon conversion by pyrolysis decreased relatively.
A Property Analysis on Spatial Distribution of Sea Water Temperature Difference for Site Selection of Ocean Thermal Energy Conversion Plant
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 567~575
This study found potential ability to generate electric power using difference in water temperature between sea surface water and deep water in the East Sea which includes the East Sea Proper Water with the temperature less than 1
throughout a year without seasonal variation. To quantify the difference in water temperature between sea surface water and deep water in the East Sea. We computed the annual mean (
), the annual amplitude (
), the annual phase (degree) and the duration time which showed more than 15
temperature difference from the water temperature data using Harmonic analysis during 1961~1997. The best place for generating electric power in the East Sea seems to be the eastward ocean areas (36
00E'E) from Pohang city. The annual mean of the difference in water temperature between sea surface water and 500 m depth was 24
C at the place to generate electric power in August according to the data of 1961~1997. the maximum duration periods with more than 15
temperature difference were 215 days (5/5-12/10) a year in the place mentioned electricity with a stable plan. In the East Sea coastal areas of the Korean peninsula, the average minimum depth to reach the East Sea Proper Water from surface water is 300 m and fluctuates between 250 m and 350 m throughout a year. Further studies could be needed for the utilization of cold water, such as the East Sea Proper Water for energy conversion.
Freezing Characteristics of Still Water Under a Subcooling Condition
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 576~582
this paper presents the results of experiments on subsooling degree characteristics which was analyzed in accordance with various test conditions. The test water was cooled below freezing point temperature, was measured. The results showed that using city water as the test water in pyrex tube indicated small standard deviation (SD) compared to using distilled water, and minimum subcooling degree was 6.9
, respectively. In addition, a critical subcooling degree in a pyrex tube was larger than that in a stainless steel tube about 0.7
for the same test water. It was also observed that the standard deviation of data for the distilled water showed decreasing tendency aw the increasing with cooling velocity. Then metaldehyde showed a considerable effect on the subcooling degree of distilled water as the ice nucleating substance with increase of test number.
Evaluation of Reliability Indices for Power Systems using Genetic Algorithm and Complex Method
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 583~591
this paper proposes a new approach for calculating the reliability indices of generation system, such as interruption frequency and duration, by using the moment matching technique Two separate expressions are derived, one for the loss of load expectation(LOLE) and the other for the loss of load frequency (LOLF). These expressions are combination of exponentials and are therefore easily integrable and can be readily evaluated. In this paper, the parameters of the distribution functions of the LOLE and LOLF are evaluated by using Genetic Algorithm and Complex Method, and the proposed approach is quite comparable with the other methods at the aspect of accuracy and efficiency.
Analyses of Larg Cell Area MCFC System Dynamics
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 592~604
The steady state and dynamic characteristics of large cell area MCFC stacks were analyzed to solve the problems such as temperature difference generated in stacks and pressure difference between anode and cathode. Manipulated variables (current density, duel utilization rate, oxidant utilization rate) and controlled variables (temperature difference, anode and cathode pressure difference) which had an important effect on the MCFC stack performance were determined using operation results of two types of MCFC stacks (5kW (3,000
, 20 ea). 3kW (6,000
, 5ea)). The stability and transfer function representing system dynamics were obtained by steady state gain rate which showed the relative change between MVs and CVs. The transfer function was a 3
3 matrix and a typical first order system without time delay. The optimal operating condition of large cell area MCFC stacks could be determined by analyzing dynamic characteristics. In case of a 5 kW MCFC stack, pressurized operation with recycle flow should be used to control the outlet temperature less than 68
and to control the MCFC system effectively. MIMO control or decoupler should be used to remove the interaction between MVs and CVs. This result will be used as important data in determining the control structure design and operation mode of large cell area MCFC systems in the future.
Development of On-Line Life Monitoring System for high-Temperature Header of Fossile Powder Plant Boiler
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 605~611
Conventional methods for assessing remaining life of critical high temperature components in fossil power plants rely on nondestructive inspection practices and accompanying life analysis based on fracture mechanics By using these conventional methods. It has been difficult to perform uninterrupted in-service inspection for life prediction. Thus, efforts have been made for developing on-line remaining life monitoring systems employing information on the shape of structures, operating variables and material properties. In thus study, a software for on-line life monitoring system which performs real-time life evaluation of a high temperature system headers was developed. The software is capable of evaluating creep and fatigue life usage from the real-time stress data calculated by using temperatures/stress transfer Green functions derived in advance for the specific headers. The major benefits of the developed software life in determining future operating schedule, inspection interval, and replacement plan by monitoring real-time life usage based on prior operating history.
Environmental Impact Assessment in LCA Using Analytic Network Process
Journal of Energy Engineering, volume 8, issue 4, 1999, Pages 612~620
Environmental impact assessment in the step of the Life Cycle Assessment (LCA) measures relative values of importance or weight of the environmental load characterized in the inventory analysis. The weight measurements are used to evaluate the environmental load or the effect of the industrial product or technology. In this paper the Analytic Network Prpcess (ANP) is introduced to calculate a relative weighting of the environmental impact. The ANP is considered as one of the useful decision making framework and allow for more complex interrelationships, feedback, and inner/outer dependence among the decision level and factors. The weighting from the ANP may applied to obtain the overall evaluation value of environmental load.