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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Energy Engineering
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Journal DOI :
The Korea Society for Energy Engineering
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Volume & Issues
Volume 16, Issue 4 - Dec 2007
Volume 16, Issue 3 - Sep 2007
Volume 16, Issue 2 - Jun 2007
Volume 16, Issue 1 - Feb 2007
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Quantitative Comparison and Analysis of Decommissioning Scenarios Using the Analytic Hierarchy Process Method and Digital Mock-up System
Kim, Sung-Kyun ; Park, Hee-Sung ; Jung, Chong-Hun ; Lee, Kune-Woo ;
Journal of Energy Engineering, volume 16, issue 3, 2007, Pages 93~102
This paper presents a scenario evaluation model of the AHP (Analytic Hierarchy Process) to evaluate dismantling scenarios considering quantitative and qualitative considerations. And decommissioning information producing modules which can obtain a dismantling schedule, quantify radioactive waste, visualize a radioactive inventory, estimate a decommissioning cost, and estimate a worker's exposure was developed to assess qualitatively decommissioning information. The digital mock-up (DMU) system was developed to verify dismantling processes and find error of scenarios in virtual space. It combines and manages the decommissioning information producing modules, the decommissioning DB, and the dismantling evaluation module synthetically. By using AHP model and DMU system, the thermal column in KRR-1 was evaluated on plasma arc cutting scenario and nibbler cutting scenario using the developed decommissioning DMU system.
A Study on Application Analysis Using RETRAN Computer Code for the Environmental Qualification Flood Analysis Following the Main Feed Water Line Break
Park, Young-Chan ; Cho, Cheon-Hwey ; Hong, Sung-In ;
Journal of Energy Engineering, volume 16, issue 3, 2007, Pages 103~112
Flood issue for nuclear power plants designed and built in 1970 is extremely severe for main steam header compartment and main feedwater line region of intermediate building and lower floor. A calculation for flood level at the main feedwater line isolation compartment is now performing by hand calculation. But, this methodology is quite conservative assumption. The goal of this study was to develop method to analyze flowrate using the RETRAN-3D computer code, and the developed method was applied to flood level analysis following main feedwater line break. As a result of analysis, flood level was low remarkably.
Characteristics of Auto-ignition and Micro-explosion for Array of Emulsion Droplets
Jeong, In-Cheol ; Lee, Kyung-Hwan ; Kim, Jae-Soo ;
Journal of Energy Engineering, volume 16, issue 3, 2007, Pages 113~119
The auto-ignition characteristics and combustion behaviors of one-dimensional array of water-in-fuel droplets suspended in a high temperature chamber have been investigated experimentally with various droplet spacing and number of droplets. The fuels used were pure n-decane and emulsified n-decane with water contents varied from 10% to 30%. All experiments have been performed at 920 K under the atmospheric pressure. The number of droplets in an array were fixed as 3 or 5 and its spacing was varied from 3 mm to 7 mm by 1mm interval. The imaging technique with a high-speed camera has been adopted to measure the ignition delay and flame life time. The micro-explosion behaviors were also observed. As the droplet array sparing increased, the ignition delay also increased regardless of water contents. However, the life time of droplet array decreased as the droplet spacing increased. The full combustion time in array of 3 droplets was found to be longer than that for 5 droplets case due to the longer ignition delay.
A Study on the Characteristics of Ignition and Combustion, in a Diesel Spray Using Multi-Component Mixed Fuels
Yoon, Jun-Kyu ; Lim, Jong-Han ;
Journal of Energy Engineering, volume 16, issue 3, 2007, Pages 120~127
The purpose of this study is experimentally to analyze that the fuel mass fractions of multi-component mixed fuels have an effect on the characteristics of spray ignition and combustion under the ambient conditions of diesel combustion fields. The characteristics of ignition and combustion were investigated by chemiluminescence images and direct photography. The experiments were conducted in the RCEM(rapid compression expansion machine) with optical access. Multi-component fuels mixed with i-octane, n-dodecane and n-hexadecane are injected in RCEM by the electronic control of common rail injector. Experimental conditions set up 42, 72 and 112 MPa in injection pressure, 700, 800 and 900 K in ambient gas temperature. The results show that the ignition delay was dependent on high cetane number. In case of low ambient temperature, the more low boiling point fuels were mixed, the lower luminance regime had a remarkable effect and also shortened diffusion combustion by increasing heat release rate.
A Fuzzy QFD Approach to the Determination of Importance Weights of Nuclear Quality Assurance Requirements
Park, Chan-Gook ; Choi, Gi-Ryun ;
Journal of Energy Engineering, volume 16, issue 3, 2007, Pages 128~148
Quality assurance (QA) for nuclear R&D project is very concerned about the poor economy due to the improper selection of QA requirements. This paper proposes a new methodology for determining the relative importance weights of QA requirements considering the attributes of nuclear R&D project. QFD (Quality Function Deployment) is used as a conceptual framework and fuzzy number is introduced to capture the vagueness uncertainty existing in human judgement. Also we use a confidence attitude of decision-maker in order to improve the reliability of extracted attribute level of R&D project. Case study on a nuclear R&D project and scenario analysis are carried out to verify the usefulness and effectiveness of proposed methodology.
Evaluation of Air-side Friction Characteristics on Design Conditions of Slit Fin and Tube Heat Exchanger
Cho, Sung-Chul ; Kim, Chang-Duk ; Kim, Chang-Eob ; Kwon, Jeong-Tae ; Lim, Hyo-Jae ;
Journal of Energy Engineering, volume 16, issue 3, 2007, Pages 149~154
An experimental study on the air-side pressure drop of slit fin-tube heat exchanger has been carried out. The data reduction methodology for air-side pressure drop in the literature is not based on a consistent approach. This paper focuses on method of data reduction to obtain the air-side performance of fin-tube heat exchanger using R22 and recommends standard procedures for dry and wet surface pressure drop estimation in fin-tube heat exchanger. A comparison was made between the predictions of previously proposed empirical correlations and experimental data for the air-side pressure drop on design conditions of condenser and evaporator. Results are pre-sented as plots of friction f-factor against Reynolds number based on the fin collar outside diameter and compared with previous studies. The data covers a range of refrigerant mass fluxes of
with air flows at velocity ranges from 0.38 m/s to 1.6 m/s.