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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 25, Issue 2 - Jun 2016
Volume 25, Issue 1 - Mar 2016
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Measurement of Wax Appearance Temperature Using Image Processing
Hwang, Soon-Hye ; Kang, Pan-Sang ; Lim, Jong-Se ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 1~8
DOI : 10.5855/ENERGY.2015.25.1.001
When the oil is produced in the low temperature environment, wax can be accumulated in petroleum production system(pipeline, riser) and causes problems such as pipeline stucking, disturbance of the oil production. These problems can be lead to time-consuming and economic losses for flow assurance. For prediction and mitigation of wax deposition, it is necessary to measure the Wax Appearance Temperature(WAT) which is a temperature when the wax crystals start to be formed. WAT standard measurement method of transparent oil has to determine the cloud point of sample to the naked eye and cannot be applied to continuous change of the temperature. In this study, wax behavior of transparent oil samples are recorded depending on temperature using Visualized WAT Measurement System. Also, WATs of transparent oil samples are measured by image processing and compared with the result of the standard method.
An Experimental Study on LTD Stirling Engine (MM-7) for the Development of TM Electric Conversion System
Kim, Yeongmin ; Chen, Kuan ; Chun, Wongee ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 9~14
DOI : 10.5855/ENERGY.2015.25.1.009
This study has been carried out to develop TM (Thermal to Mechanical) conversion systems for electric power generation using one of the Low Temperature Differential (LTD) Stirling engines called MM-7 capable of harnessing low temperature waste heat whose temperature is only
above the ambient. Measurements were made on the torque and rpm for a number of temperature differentials between the engine hot and cold ends, which could be effectively applied in developing the most suitable configuration for the high performance TM (Thermal to Mechanical) conversion system.
Abnormal Operation Analysis of the Wolsong 2,3,4 Heat Transport System
Shin, J.C. ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 15~22
DOI : 10.5855/ENERGY.2015.25.1.015
The heat transport system transients of Wolsong 2,3,4 nuclear power plants were analysed during abnormal operating conditions. The compliance with requirements of AECB Regulatory Document R-77 for CANDU reactor was estimated. The analysis results showed that for each postulated accident the peak pressure values in the reactor headers are within the acceptance criteria given in ASME code requirements. The effect of LRV that is one of the overpressure protection device was very minor.
A Numerical Study on the Agglomeration of Algae by the Ultrasonic Wave
Ha, Ji Soo ; Shim, Sung Hun ; Jung, Sang Hyun ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 23~28
DOI : 10.5855/ENERGY.2015.25.1.023
In spite of various merit of algae as biofuel, the production cost of algae is a considerable obstacle for commercialization. The concurrent development of essential technologies is needed for the cultivating, harvesting, extracting and energy transformation. The production cost of algae biofuel has still higher than that of the other commercial biofuel. The major research activity has been focused on the cultivating and the research of other processes has been done with relatively lower activity. It is difficult to separate the algae from water because of the similar magnitude of density each other. The agglomeration and extracting of algae with the hybrid technology using ultrasonic wave is rare effect of environmental hazard and also it is appropriate technology for the next generation energy resources. The present research is investigated for the effective separation of algae from water with the ultrasonics wave. The aim of the present research is focused on the establishment of optimal design of algae agglomeration system. For this purpose, the computational fluid dynamic analysis has been conducted in the flow field with ultrasonic wave and algae flow to clarify the mechanism of algae separation by ultrasonic wave.
A Study on the Incentive-based Strategies for Utilization of Thermoelectric Power Plant Hot Waste Water: Focusing on the Analysis of Levelized Cost of Energy(LCOE)
Nam, Tae-Sub ; Lee, Kwan-Young ; Kim, Kyung Nam ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 29~42
DOI : 10.5855/ENERGY.2015.25.1.029
This study analyzes the economic efficiency of utilizing hot waste water at a thermoelectric power plant, which is part of recent projects supported by the Korean government to foster new energy industry. The author proposes an institution that provides economic incentives to promote the project. Based on a method of calculating Levelized cost of energy (LCOE), this study finds that the LCOE of using hot waste water at power plants is higher than that of oil boiler, biomass and a power plant's auxiliary steam but similar to that of the geothermal system. Also, according to sensitivity analysis on the LCOE of each element in the system of using hot waste water, a distance of heat supply is most sensitive. Therefore, this study shows that when the government devises an incentive-based institution to expand the project of utilizing hot waste water, it is necessary to establish Renewable Energy Certificate (REC) weights that are differentiated by a distance of heat supply.
A Economic Evaluation for APR+ Standard Design
Ha, Gag-Hyeon ; Lee, Jae-Ho ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 43~47
DOI : 10.5855/ENERGY.2015.25.1.043
KHNP CRI has developed APR+ nuclear power plant since 2007, which is GEN III+ model with 1500 MWe capacity. To develop safer nuclear power plant than APR1400, we investigated advanced design features of ALWR being constructed in Korea and being developed/constructed in foreign countries. We applied the advanced design features and lessons learned from Fukushima accident to develop APR+ standard design suitable for both domestic construction and overseas construction business. One economic assessments have performed during safety design improvement phase(2013.1 ~ 2015.12) of APR+. The result of the economic analysis for APR+ safety inhancement design showed that APR+ N-th plant is about 39.2% more economical than coal-fired 1,000MW power plant. Also APR+ plant is more cost advantage over foreign advanced nation ALWRs.
Measurement and Prediction of Autoignition Temperature of n-Hexanol+p-Xylene Mixture
Ha, Dong-Myeong ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 48~55
DOI : 10.5855/ENERGY.2015.25.1.048
The autoignition temperature (AIT) of a material is the lowest temperature at which the material will spontaneously ignite. The AIT is important index for the safe handling of flammable liquids which constitute the solvent mixtures. This study measured the AITs of n-hexanol+p-xylene system by using ASTM E659 apparatus. The AITs of n-hexanol and p-xylene system which constituted binary system were
, respectively. The experimental AITs of n-hexanol+p-xylene system system were a good agreement with the calculated AITs by the proposed equations with a few A.A.D.(average absolute deviation).
Assessment and Improvement of the Horizontal In-Tube Condensation Heat Transfer Model in the MARS code
Lee, Hyun Jin ; Ahn, Tae Hwan ; Yun, Byong Jo ; Jeong, Jae Jun ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 56~68
DOI : 10.5855/ENERGY.2015.25.1.056
Extensive researches have been carried out for enhancing the safety of nuclear power plants and, especially, the development of passive cooling systems, such as passive containment cooling system (PCCS) and passive residual heat removal system, is increasingly important, where condensation is a crucial heat transfer mechanism. Recently, Ahn & Yun et al. developed a horizontal in-tube condensation heat transfer model as one of the activities for the PCCS development. In this work, we implemented the Ahn & Yun 's condensation heat transfer model into the MARS code and assessed it using the PASCAL experimental data. Based on the results of the assessment, we identified the limitations of the Ahn & Yun 's model and suggested a modified Ahn & Yun 's model, and assessed the model using various experimental data.
Evaluation of Bubble Size Models for the Prediction of Bubbly Flow with CFD Code
Bak, Jin-yeong ; Yun, Byong-jo ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 69~75
DOI : 10.5855/ENERGY.2015.25.1.069
Bubble size is a key parameter for an accurate prediction of bubble behaviours in the multi-dimensional two-phase flow. In the current STAR CCM+ CFD code, a mechanistic bubble size model
is available for the prediction of bubble size in the flow channel. As another model, Yun model is developed based on DEBORA that is subcooled boiling data in high pressure. In this study, numerical simulation for the gas-liquid two-phase flow was conducted to validate and confirm the performance of
model and Yun model, using the commercial CFD code STAR CCM+ ver. 10.02. For this, local bubble models was evaluated against the air-water data from DEDALE experiments (1995) and Hibiki et al. (2001) in the vertical pipe. All numerical results of
model predicted reasonably the two-phase flow parameters and Yun model is needed to be improved for the prediction of air-water flow under low pressure condition.
Start-up and operation of Gasoline Fuel Processor for Isolated Fuel Cell System
Ji, Hyunjin ; Bae, Joongmyeon ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 76~85
DOI : 10.5855/ENERGY.2015.25.1.076
This study introduces the system layout and control strategy necessary to start and operate a fuel processor in a wide range of temperatures where a gasoline was selected as the fuel of fuel processor considering logistic support of Korea Army. The autothermal reformig(ATR) catalyst is heated to light-off temperature by combustion method in the initial stage. In order to ignite the gasoline and air mixture stably, the glow plug is installed after ATR catalyst. When the catalyst is increased to light-off temperature, the reformer is operated from initiation to steady state conditions as follows: Partial oxidation(POX) mode, partial ATR mode, full ATR mode. Finally the start-up and control strategy is validated by the operational test of gasoline fuel processor at low and room temperature. As a result the gasoline fuel processor is able to start-up within 40 min and to produce the reformate gas which has 37 ~ 42 vol.%(dry basis) of
and 0.3 vol.% of CO.
Design Guideline of Waveguide-Below-Cutoff Array for Electromagnetic Pulse Shielding
Pang, Seung-Ki ; Kim, Jae-Hun ; Yook, Jong-Gwan ; Kim, Yuna ; Kim, Sangin ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 86~91
DOI : 10.5855/ENERGY.2015.25.1.086
Convenient design guideline for Waveguide-below-cutoff (WBC) array is proposed to obtain the minimum waveguide length for electromagnetic pulse (EMP) shielding. The analysis includes circular, rectangular, and hexagonal WBC, determine the total length of the waveguide. When the unit side of rectangular WBC and the diagonal line of hexagonal WBC are given as 30 mm, the length of hexagonal WBC is 5 mm shorter than rectangular case with shielding effectiveness (SE) 80 dB. The length difference is deepened with SE of 100 dB, which shows approximately 30 mm shorter length for hexagonal case than others. In addition, hexagonal WBC requires much shorter length than circular WBC. In conclusion, hexagonal case is the most effective with respect to flow velocity and pressure loss for equivalent SE.
The Application Method of DC Distribution in Microgrid
Lee, Soon-myung ; Kim, Jeong-Uk ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 92~99
DOI : 10.5855/ENERGY.2015.25.1.092
In this paper, After the Paris climate conference (COP21) in December 2015, 195 countries adopted the first-ever universal, legally binding global climate deal. As sustained increase of renewable energy and digital load, to implemented and operated Microgrid system's power distribution by DC power distribution. This reduce the loss of power conversion step occurring based on the AC power distribution system and eliminate the loss caused by the reactive power in power distribution system. For this reason, DC Microgrid will be extended to support evidence of National energy policies, Microgrid project status, DC distribution status, and to suggest process of DC power distribution in Microgrid construction project.
A Fundamental Study of Hybrid Combustion System Applying Exhaust Gas Recirculation
Oh, Wheesung ; Yu, Byeonghun ; Park, Taejoon ; Lee, Chang-Eon ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 100~107
DOI : 10.5855/ENERGY.2015.25.1.100
In this study confirmed the reduction effect of pollutant by applying Fi-EGR and FPI-EGR to hybrid combustion system realizing premixed flame and non-premxied flame at once. The results showed that NOx emission index decreased significantly in case of adopting EGR. Additionally, the hybrid combustion system with EGR resulted in a better performance compared to usual non-premixed combustion system such that it can reduce
emission at equivalent EGR ratios. Especially, in the case of 25% of FI-EGR ratio at hybrid combustion system that the ratio of non-premixed and premixed is 50 : 50, NOx emission index reduction rate was about 59% compared to
emission of non-premixed combustion system without EGR and in the case of 15% of FPI-EGR ratio at hybrid combustion system that the ratio of non-premixed and premixed is 70 : 30,
emission index reduction rate was about 48% compared to
emission of hybrid combustion system without EGR.
A Study on Improvement of Nuclear Power Plant Construction System According to Data-centric Design Technique Introduction in Korea
Lim, ByungKi ; Byon, Sujin ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 108~112
DOI : 10.5855/ENERGY.2015.25.1.108
This study is established the data-centric design concept, which is the latest design technique, by analyzing existing study literature for its application on the nuclear power plant industry in Korea. This study investigated the data-centric design cases in the advanced companies and suggests a data-centric design integrated system framework by analyzing the major functions of the commercial 3D CAD system, which is globally used in the plant architect engineering. In order to apply the data-centric design integrated system framework to the nuclear power plant industry in Korea, the main functions of a nuclear power plant design information integrated system framework, which can manage the design products of each EPC step and the related information in integrated way, is suggested by analyzing the supplier design, field design process and field design drawings, which have close relation with the plant Architect Engineering (A/E). It is expected that the result of this study would contribute in the dramatic enhancement in the job efficiency of nuclear power plant design process in Korea.
Optimal Ccontrol Strategy of Cooling System for Polymer Electrolyte Membrane Fuel Cell using Hardware-In-the-Loop Simulation
Choi, Eunyeong ; Ji, Hyunjin ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 113~121
DOI : 10.5855/ENERGY.2015.25.1.113
Polymer electrolyte membrane fuel cell(PEMFC) requires cooling system to maintain the proper operating temperature(about
) because the efficiency and power are affected by operating temperature. In order to retain the operating temperature of PEMFC, cooling system and coolant control logic are needed. Hardware-in-the-loop simulation(HILS) is one of effective methods to study and evaluate control algorithm. In this paper, the HILS system was designed to study the coolant control algorithm. The models of HILS system consisted of PEMFC, heat exchanger, and external environment associated with temperature. The hardwares in HILS system are 3-way valves, pumps, and a heat exchanger. The priority control and the control target temperature were investigated to improve the control performance using HILS. The 3-way valve in
cooling circuit was selected as priority control target. The under limit value of
3-way valve set as a function of PEMFC power and
circuit coolant temperature to correct temperature control performance. As a result, the temperature of PEMFC is stably controlled.
A Effects of Natural Gas-Diesel/Hi-sene Dual Fuel Operation on Performance of a Heavy-Duty Diesel engine for Power Generation
Cho, Jungkeun ; Park, Sangjun ; Song, Soonho ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 122~130
DOI : 10.5855/ENERGY.2015.25.1.122
This study is a numerical study using commercial simulation program GT-Power on 1.5MW diesel engine for power generation. Performance comparison has done for diesel operation with dual fuel operation for different engine load(50%, 75%, 100%) using the target engine model with additional gas injection system. Effect of using Hi-sene, which is actually being used in island area, instead of diesel was also studied. As a result, under 60% natural gas with diesel condition, BSFC was increased by 32% without modifying system. There was almost no change for natural gas/Hi-sene condition compared with natural gas/diesel condition. Decrease of burned fuel fraction was the main reason of these phenomena. After optimizing system, BSFC was improved by 2%.
A Study on the Analysis and Methods to Improve the Management System for Building Energy Database
Kim, Sung-Min ; Yoon, Jong-Don ; Kwon, Oh-In ; Shin, Sung-Eun ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 131~144
DOI : 10.5855/ENERGY.2015.25.1.131
Damage occur frequently around the world on climate change and the main cause of greenhouse gas emissions regulation is growing. To this end, the government has built integrated management system for national building energy. The building energy information is total 6.8 million complex. Integrated management system for national building energy database are matched building registers information and energy information of the supply agencies. However, the matching process has its limitations so advanced work is in progress continuously. This study analyzed integrated management system for national building energy database quality and limitations and deduce improvement plan to increase system reliability and availability. The existing database matching average rate is 85.6%. 58.2% of the total non-matching data type has no building information. To ensure the ease of new database matching and the accuracy of the existing database matching, address standarization and building properties system are needed between building information and energy information. Also, The system construction is required to include information on other energy sources like petroleum energy which has high proportion of non-urban areas and small residential areas and renewable energy which has high potential in development and utilization.
Design and Implementation of Concentration Calculation Algorithm for the Infrared Combustible Gas Detector
Han, Seungho ; Lyu, Geunjun ; Lee, Yeonjae ; Kim, Hiesik ; Park, Gyoutae ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 145~152
DOI : 10.5855/ENERGY.2015.25.1.145
Recently, we can find news about toxic and combustible gas accident. So, we have to develop gas detector that can measure gas at dangerous area for preventing gas accidents. In this paper, we calculate a approximation function from sensor's output using the linear regressiong. And we develop software algorithm using Neville's algorithm for measuring gas concentration. Finally, we compare our algorithm with combustible gas detectors that are already developed, by using standard gas samples manufactured Korea Gas Safety. As a result of this experiment, we confirm that performance of our algorithm is more improved than performance of already developed combustible gas detectors. In the future, we'll research how to improve reliability from using count, temperature and humidity. And we'll design hardware applied explosion proof for safety.
Experimental Investigation of the CHF for the Narrow Rectangular Channel in the Downward Flow
Kim, Hui Yung ; Yun, Byong Jo ; Bak, Jin Yeong ; Park, Jong Hark ; Chae, Heetaek ; Park, Cheol ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 153~162
DOI : 10.5855/ENERGY.2015.25.1.153
Experimental investigation was carried out on the CHF(Critical Heat Flux) under downward flow condition in narrow rectangular channels simulating subchannel of plate-type-fuel for JRTR(Jordan Research and Training Reactor). The experiments covers the license requirement of the research reactor. Two test sections used in this study simulate full scale subchannels for fission moly uranium target and plate-type-fuel, respectively. From the experimental results, the parameters affecting on the CHF are investigated. By using experimental data, the existing CHF prediction models were evaluated. Finally, the applicability of correlations were analysed to predict CHF in the narrow rectangular channel under the downward flow condition.
Effect of Internal Circuit Faults of Non-reference Type APS Malfunction on Commercial and Tactical Vehicles
Jo, Yong Jin ; Cho, Haeng Muk ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 163~170
DOI : 10.5855/ENERGY.2015.25.1.163
In the condition of electronic controlled acceleration system, APS Sensor is the only and the most important parts to reflect the will of driver. Especially, the non-reference type APS is the critical part of this system. It can't provide the cross-reference values and it will make the vehicle goes into the 'NMC(Non-moveable condition)' or 'Limp-home mode' on the malfunction situation easier. If the situation is happened, it's very dangerous condition for the drivers, soldiers and war material systems of battlefield. The electronic control is not a necessary system for the tactical vehicles. The tactical vehicles must be prepared the manual control system independently from the electronic control system to escape, save and rescue the soldier's life and war materials. Therefore it was studied the water-penetrated broken APS output. If the output value was changed without driver's will, even the cross-reference type APS, it will effect the uncontrollable engine RPM changing or the performance down on limp-home mode. It means the manual control system of tactical vehicle is needed for any kinds of APS.
The Sour Gas Treatment and Removal Technology
Kim, Y.C. ; Cho, J.D. ; Oh, C.S. ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 171~176
DOI : 10.5855/ENERGY.2015.25.1.171
Sour gas is natural gas or any other gas containing significant amounts of hydrogen sulfide (
). Natural gas is usually considered sour gas if there are more than 5.7 milligrams of
per cubic meter of natural gas, which is equivalent to approximately 4 ppm by volume under standard temperature and pressure We have surveyed on the treatment and removal technology of sour gas, sour gas include a lot of hydrogen sulfide(
), Carbon dioxide(
) and mercaptan(
) etc. We need high technology for development for these kinds of raw gases and we should specially take care of treating and removal of theses raw gases. Therefor we are going to describe about these kinds of raw gases and about methods how to treat these kinds of gases.
A Study on Development of Improvements to Collaborative Energy Saving Projects with NGO
Lim, Ki Choo ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 177~184
DOI : 10.5855/ENERGY.2015.25.1.177
Solutions to improve collaborative energy-saving programs were developed as follow; First, the scoring for the selection of the programs between KEMCO and the NGOs' Energy Network needs to be adjusted. Second, solutions were proposed to diversify the network selected to participate in programs and to tighten the network among the participating citizens. Third, improving the compatibility with the targets that are set for the program and raising the program budget was proposed. Fourth, ideas to introduce the final evaluation guidelines for the programs by the network, to improve the convenience of the program procedures. Fifth, developing a manual to inspect energy-saving measures in households, counseling for at-home energy-saving behaviors, sharing search programs such as financial support and home repair, introducing a program energy-saving APPs.
Study on the Pressure Balance of the Hybrid Safety Injection Tank
Ryu, Sung Uk ; Ryu, Hyobong ; Byun, Sun-Joon ; Jeon, Woo-Jin ; Park, Hyun-Sik ; Lee, Sung-Jae ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 185~191
DOI : 10.5855/ENERGY.2015.25.1.185
The Hybrid Safety Injection Tank is a passive safety injection system that enables the safety injection water to be injected into the reactor pressure vessel throughout all operating pressures by connecting the top of the SIT and the pressurizer(PZR). In this study, the condition for balancing the pressure between the Hybrid SIT and PZR was derived theoretically. The pressure balancing condition was set at the point where the velocity of the Hybrid SIT coolant injected into the Direct Vessel Injection(DVI) line was at or above zero. If the condition was derived from a pressure network for the Hybrid SIT, pressurizer, and reactor pressure vessel, the pressure difference between the pressurizer and SIT is less than 0.07 MPa.
Fault Analysis of Semiconductor Device
Park, S.J. ; Choi, S.B. ; Oh, C.S. ;
Journal of Energy Engineering, volume 25, issue 1, 2016, Pages 192~197
DOI : 10.5855/ENERGY.2015.25.1.192
We have surveyed on technical method of fault analysis of semiconductor device. Fault analysis of semiconductor should first be found the places of fault spots. For this process they are generally used the testers; EB(emission beam tester), EM(emission microscope), OBIRCH(optical beam induced resistance change method) and LVP(laser voltage probing) etc. Therefore we have described about physical interpretation and technical method in using scanning electron microscope, transmission electron microscope, focused ion beam tester and Nano prober.