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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 24, Issue 4 - Dec 2015
Volume 24, Issue 3 - Sep 2015
Volume 24, Issue 2 - Jun 2015
Volume 24, Issue 1 - Mar 2015
Selecting the target year
Effect of torrefaction on enzymatic saccharification of lignocellulosic biomass
Choi, Hyoyeon ; Pak, Daewon ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 1~5
DOI : 10.5855/ENERGY.2015.24.3.001
This study is to investigate the effect of torrefaction on enzymatic hydrolysis of lignocellulosic biomass for bio-ethanol production. As a pretreatment, the torrefaction of lignocellulosic biomass was conducted in temperature of
in the absence of oxygen. Tween-80, nonionic surfactant, was tested to enhance saccharification efficiency by coping with hydrophobicity resulted from torrefaction. As a result, the glucose production from enzymatic hydrolysis of biomass pretreated by torrefaction was greater than that obtained from the non-pretreated biomass. Sugar conversion was higher when the biomass was saccharified with addition of tween-80. It was found that torrefaction can be applied as a preptreatment for lignocellulosic biomass and tween-80 is needed to enhance its enzyme saccharification.
Design and Implementation of PLC Automatic Welding System with Power-saving
Yang, Young-Joon ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 6~12
DOI : 10.5855/ENERGY.2015.24.3.006
The welding technology has been used in almost all industries such as automotive, shipbuilding, power plants and industrial machinery. In this study, the design and implementation of PLC
welding automation system were investigated. For these purposes, the structure analysis for driving supporter was performed and specification of automatic voltage regulator, mutual interface of system and circuit diagram were designed in order to contrive power-saving system. As the results, the stability of design for driving supporter could be convinced by numerical analysis and PLC automatic welding system was suitable for welding automation of structural-manufacturing factory capable of producing various and small amount products. Therefore, it was confirmed that PLC
welding automation system could contribute to productivity, stable quality and power-saving.
Development of a Movable Pellet Manufacturing Equipment
Jho, Shi Gie ; Kum, Sungmin ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 13~19
DOI : 10.5855/ENERGY.2015.24.3.013
The wood pellet is standardized of woody type fuel which of small cylindrical shape that is produced compress wood remnants in process of woody processing. The pellet is critical energy which expects to increase of the amount used in future. It consumes fuel which of home, common facilities stove and boiler, district heating, and CHP, etc. This study was to develop a movable pellet manufacturing equipment that can be mounted on a truck. The pellet production volume is approximately 309kg per hour, daily output is about 2ton. One days work based on the expected revenue of approximately \268,000 feasibility is considered sufficient.
A Study on the Reliability of the Combustible Properties for Acrylic Acid
Ha, Dong-Myeong ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 20~26
DOI : 10.5855/ENERGY.2015.24.3.020
For the reliability of the combustible properties of arylic acid, this study was investigated the explosion limits of acrylic acid in the reference data. The flash points and AITs(auto-ignition temperatures) by ignition delay time were experimented. The lower flash points of acrylic acid by using Setaflash and Pensky-Martens closed-cup testers were experimented in
, respectively. The lower flash points of arylic acid by using Tag and Cleveland open cup testers were experimented in
. This study measured relationship between the AITs and the ignition delay times by using ASTM E659 tester for acrylic acid. The AIT of acrylic acid was experimented as
. The lower explosion limit(LEL) and the upper explosion limit(UEL) by the measured the lower flash point and the upper flash point of acrylic acid were calculated as 2.2 Vol% and 7.9 Vol%, respectively.
A study on the Interlock Circuit Abnormality of High Voltage System in HEV
Song, Rak Hyun ; Cho, Haeng Muk ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 27~33
DOI : 10.5855/ENERGY.2015.24.3.027
Recently, global warming has been accelerated due to air pollution and air pollutants are coming from the exhaust of the ICE vehicles, which are gradually increasing in number globally. That is why all the countries in the world are striving to reduce pollutant emissions of automobiles by strengthening regulations on air pollution. To comply with the regulations, the auto industry came up with hybrid vehicles, which have features of both ICE vehicles and electric vehicles. Hybrid vehicles show improvements in emissions, fuel efficiency, as well as functions as electric vehicles. This study aims to show possible troubles that occur at times of damages in high-voltage systems, and to suggest responsive measures.
A study on engine performance of EGR valve problem in Hybrid vehicles
Song, Rak Hyun ; cho, Haeng Muk ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 34~39
DOI : 10.5855/ENERGY.2015.24.3.034
Recently, Air pollution is gradually increasing which are coming from the exhaust of the ICE vehicles in the world. ICE vehicle exhaust gas and
are widely suspected of contributing to the called greenhouse effect, fueling fears of global warming. Therefore, many countries are striving to decrease the vehicle exhaust gas and have developed a variety of policies as air pollution regulation plans. To comply with the regulations, automotive industry has developed hybrid vehicles, which have features of both ICE vehicles and electric vehicles. Hybrid car is eco-friendly and has lowered exhausting gases and improved fuel efficiency. This research has been written to show that break down cases with EGR valve in hybrid cars, steadily increasing in use, and to help with on-site maintenance.
Measurement of the Benefits from Safeguarding Energy Security through Building the Integrated Gasification Combined Cycle Power Plant
Lim, Seul-Ye ; Choi, Hyo-Yeon ; Yoo, Seung-Hoon ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 40~47
DOI : 10.5855/ENERGY.2015.24.3.040
Integrated gasification combined cycle (IGCC) power plants not only emit less greenhouse gases and air pollutants than conventional coal-fired power plants, but also use low-price, low-quality, and internationally easily procurable coal. Thus we can benefit from safeguarding energy security through building the IGCC power plant. This paper attempts to value the benefits of energy security enhanced by IGCC power plant. To this end, we report here the results from a contingent valuation survey of randomly selected 600 households. A combination of a double-bounded model and a spike model is applied for the purpose of increasing statistical efficiency and dealing with zero(0) willingness to pay data, respectively. The results show that the respondents are additionally willing to pay 6.05 won for 1kWh of electricity generated from IGCC power plant. In other words, the benefits from safeguarding energy security through building the IGCC power plant are 6.05 won per kWh. Given that the expected amount of generation from the Taean IGCC power plant that is scheduled to be built in late 2015 is 2.27 TWh per year, the benefits are estimated to be 13.74 billion won per year.
Flow Control of a Centralized Cooling Plant for Energy Saving
Lee, Jeong Nam ; Kim, Young Il ; Chung, Kwang Seop ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 48~54
DOI : 10.5855/ENERGY.2015.24.3.048
In a centralized cooling plant, precise mechanical design and control strategy are required for peak and partial cooling load management. Otherwise, it will lead to low efficiency of cooling system and energy loss due to low partial load efficiency. The purpose of this paper is to enhance energy performance of the centralized cooling plant by controlling flow system in an industrial building using measured data and energy performance simulation program. The simulation results show that the proposed flow control can cut down annual electric power consumption by about 17% compared with the conventional cooling system.
Theoretical Analysis of a Spark Ignition Engine by the Thermodynamic Engine Model
Han, Sung Bin ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 55~60
DOI : 10.5855/ENERGY.2015.24.3.055
Recent engine development has focused mainly on the improvement of engine efficiency and output emissions. The improvements in efficiency are being made by friction reduction, combustion improvement and thermodynamic cycle modification. Computer simulation has been developed to predict the performance of a spark ignition engine. The effects of various cylinder pressure, heat release, flame temperature, unburned gas temperature, flame properties, laminar burning velocity, turbulence burning velocity, etc. were simulated. The simulation and analysis show several meaningful results. The objective of the present study is to develop a combustion model for a spark ignition engine running with isooctane as a fuel and predicting its behavior.
Effect of Compression Ratio on the Combustion Characteristics of a Thermodynamics-Based Homogeneous Charge Compression Ignition Engine
Han, Sung Bin ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 61~66
DOI : 10.5855/ENERGY.2015.24.3.061
Homogeneous charge compression ignition (HCCI) engine combines the combustion characteristics of a compression ignition engine and a spark ignition engine. HCCI engines take advantage of the high compression ratio and heat release rate and thus exhibit high efficiency found in compression ignition engines. In modern research, simulation has be come a powerful tool as it saves time and also economical when compared to experimental study. Engine simulation has been developed to predict the performance of a homogeneous charge compression ignition engine. The effects of compression ratio, cylinder pressure, rate of pressure rise, flame temperature, rate of heat release, and mass fraction burned were simulated. The simulation and analysis show several meaningful results. The objective of the present study is to develop a combustion characteristics model for a homogeneous charge compression ignition engine running with isooctane as a fuel and effect of compression ratio.
Measuring the benefits from integrated energy business-based combined heat and power plant as a decentralized generation source with a focus on avoiding the damages caused by large-scale transmission facilities
Kim, Hyo-Jin ; Choi, Hyo-Yeon ; Yoo, Seung-Hoon ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 67~73
DOI : 10.5855/ENERGY.2015.24.3.067
Almost base-loaded power plants such as flaming coal and nuclear energy require large-scale transmission facilities (LTFs) in order to send electricity to remote consumption areas. As well known, LTFs incur various social costs. However, a decentralized generation source such as integrated energy business (IEB)-based combined heat and power (CHP) plant is located in nearby electricity-consuming area, and thus it does not demand LTFs, providing the benefits from avoiding the damages caused by them. This study attempts to measure the benefits of avoiding the damages from the LTFs by the use of the contingent valuation (CV) method. To this end, a national survey of randomly chosen 1,000 households was implemented and the public`s willingness to pay (WTP) for substituting consumption of electricity generated from flaming coal-fired power plant, currently a dominant generation source in Korea, with that produced from IEB-based CHP plant. The results show that the WTP for the substitution is estimated to be about 41.4 won per kWh. Considering that this value amounts to 33% of the average price of residential electricity in 2014, the external benefit of the IEB-based CHP as a decentralized generation appears to be large.
Economic Feasibility of Energy Storage System connected with Solar /Wind Power Generation
Lee, Yong Bong ; Kim, Jeong Ho ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 74~81
DOI : 10.5855/ENERGY.2015.24.3.074
Currently, the government is encouraging the introduction of energy storage system to reduce carbon emissions and peak power demand. The government is planning the cumulative capacity of ESS of 2GW in 2020. By utilizing charge and discharge of the ESS, it is possible to sell the surplus power to utility and electricity market. This paper suggests the model that economic feasibility of energy storage system for planning the construction of power generation facilities in 2035. Our results of simulation indicate the energy storage plan of utility for constructing renewable energy facilities is need to incentives from the government to encourage power utilities and expansion of ESS.
A Numerical Study on the Efficiency of an Industrial Furnace for Oxygen Combustion Conditions
Kim, Kang-Min ; Lee, Yeon-Kyung ; Ahn, Seok-Gi ; Kim, Gyu-Bo ; Yoo, In ; Jeon, Chung-Hwan ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 82~88
DOI : 10.5855/ENERGY.2015.24.3.082
After a reheating furnace installation, the modification of the size and the heat capacity is very difficult. Therefore, the development of design package tool is required for the computation on the correct specifications before the design and the installation. Prior to development of the design tool, a module that calculates the amount of heat loss of each part according to the specifications for determining the thermal efficiency of a continuous heating furnace was developed and applied to the oxy-fuel industrial furnace. Through this, the effects of fuel type, oxygen fraction and recirculation on the efficiency of the furnace of which the output is 110Ton/hour were analyzed. In oxy-fuel combustion condition, the efficiency was 15% higher than air combustion conditions. With the using COG(Coke Oven Gas) instead of LNG, the efficiency was slightly increased. In the air combustion condition, the efficiency was increased about 33% with the preheated air. But, in oxy-fuel condition, the amount of exhaust gas was reduced, so the efficiency was increased about 7%.
Effect of the redox flow battery and electrode characteristics according to the heat treatment temperature of a carbon felt
Yoo, Hyosung ; You, Hyunjin ; Yu, Kihyun ; Kang, Junyoung ; Park, Hongsik ; Choi, Woonghwi ; Yoo, Dong Jin ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 89~95
DOI : 10.5855/ENERGY.2015.24.3.089
Carbon felts manufactured by (Co)CNF were subjected to heat treatment under different temperatures to use for the electrode of a redox-flow battery. BET and weight loss were tested to investigate the physical properties of the carbon felt according to the heat treatment conditions. SEM and XPS were also analyzed to characterize their surface area. In addition, electrical resistance, CV (cyclic voltammetry) and RFB charge on the electrode properties were examined in accordance with the heat treatment conditions with the discharge performance. The changes of physical properties on the carbon felt surface was confirmed via SEM and BET analysis, The most addition of oxygen functional groups on the carbon felt surface was obtained when one hour heat treatment at
and it was confirmed by XPS analysis. After resulting the CV tests, the active area of the electrode was the largest at
heat treatment. The heat treatment experiment of vanadium redox flow battery using the carbon felts were tested at
. As a result, the charge-discharge energy efficiency of the heat treatment electrode was 72.9% and 79.8%, at
, respectively. The efficiency of the heat treatment electrode at
was the best as 79.8% at
Preliminary Analysis of the Thermal-Hydraulic Performance of a Passive Containment Cooling System using the MARS-KS1.3 Code
Bae, Sung Hwan ; Ha, Tae Wook ; Jeong, Jae Jun ; Yun, Byong Jo ; Jerng, Dong Wook ; Kim, Han Gon ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 96~108
DOI : 10.5855/ENERGY.2015.24.3.096
A passive containment cooling system has been designed to remove the heat inside a containment during accidents without external power supply. In this work, the PCCS was introduced in the APR1400 plant to replace the containment spray system and, then, the thermal-hydraulic performance of the PCCS was analyzed using the system thermal-hydraulic computer code, MARS. A double-ended cold-leg break accident, which is known to induce the maximum pressure in the containment, is simulated, where the thermal hydraulics of the PCCS, the reactor coolant system, and the containment are simultaneously simulated. The results of the calculations showed that the PCCS can replace the existing spray system and that the containment building and its internal structure also play a very important role for the heat removal during the accident. Some sensitivity calculations were carried out to evaluate the model uncertainty and the effects of design parameters. The limitations of the PCCS are also discussed.
A study on the flow induced vibration on a heat exchanger circular cylinder
Ha, Ji Soo ; Lee, Boo Youn ; Shim, Sung Hun ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 109~114
DOI : 10.5855/ENERGY.2015.24.3.109
Heat exchanger tube array in a heat recovery steam generator is exposed to the hot exhaust gas flow and it could cause the flow induced vibration, which could damage the heat exchanger tube array. It is needed for the structural safe operation of the heat exchanger to establish the characteristics of flow induced vibration in the tube array. The researches for the flow induced vibration of typical heat exchangers have been conducted and the nondimensional PSD(Power Spectral Density) function with the Strouhal number, fD/U, had been derived by experimental method. The present study examined the results of the previous experimental researches for the nondimensional PSD characteristics by CFD analysis and the basis for the application of flow induced vibration to the heat recovery steam generator tube array would be prepared from the present CFD analysis. For the previous mentioned purpose, the present CFD analysis introduced a single circular cylinder and calculated with the unsteady laminar flow over the cylinder. The characteristics of vortex shedding and lift fluctuation over the cylinder was investigated. The derived nondimensional PSD was compared with the results of the previous experimental researches and the characteristics of lift PSD over a single circular cylinder was established from the present CFD study.
A study on the lighting control system as a demand resources
Kim, Jeong-Uk ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 115~121
DOI : 10.5855/ENERGY.2015.24.3.115
This paper presents the introduction plan of the renewable energy in innovation city. The introduction plan to make the condition of innovation city best should consider the economical efficiency, the quality of life and the sustainable development. The design of balanced city is demanded to build environment friendly and sustainable city. Energy efficient buildings should be designed to deal with the energy efficiency and environment problem. Therefore, in this paper, we analyze the energy efficiency and provide the method to introduce the renewable energy system, in various buildings. As a result, the renewable energy plans of each innovation city are suggested and analyzed.
Flow Analysis around the Multi-beam Robot in a Clean Room
Lee, Suk Young ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 122~127
DOI : 10.5855/ENERGY.2015.24.3.122
We carried out three-dimensional flow analysis in a clean room. Flow field in a robot experiment system, induced from the moving robot, is numerically studied in this paper. The effects of moving robot in a clean room are investigated in order to find the section of dust accumulation. Contamination on the bottom produced from the moving robot is predicted from the analysis results from the flow fields. Results show that a large swirl flow is formed around the moving robot. Consequently, the optimal flow condition can be obtained by controlling the fluid velocity through the fixing of inlet or outlet position.
Dynamic Analysis of a Three-Axis Mechanism for Transfer Robots
Lee, Suk Young ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 128~134
DOI : 10.5855/ENERGY.2015.24.3.128
This research is that analyze multi-body system that have flexible and rigid body. Transfer robots are widely used mainly in automobile industry owing to its capability to handle heavy parts with high speed in wide range of movement. For the transfer robots to widen the application area, a new three-axis mechanism with heavy payload has been recently developed in consideration of the strength and stiffness. For the purpose, transient dynamic analysis is carried out to find the component position yielding a certain time. Though this research, we can analysis stress distribution and deformation of robot component.
Natural Convection Heat Transfer in a Hemispherical Pool with Volumetric Heat Sources
Park, Hae-Kyun ; Chung, Bum-Jin ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 135~141
DOI : 10.5855/ENERGY.2015.24.3.135
The core melts stratifies into lower mixture layer and upper metal layer by density in a severe accident condition. The decay heat generated from the mixture layer threatens the integrity of the reactor vessel. This study simulated the natural convection heat transfer of the mixture layer with volumetric heat source using the mass transfer system.
electroplating system was used as the mass transfer system. With the modified Rayleigh number of
, the Nusselt number showed minimum at the bottom and increased along curvature to the top of the experimental apparatus.
A Study on Development of Evaluation Indicators to Collaborative Energy Saving Projects with NGO
Lim, Ki Choo ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 142~149
DOI : 10.5855/ENERGY.2015.24.3.142
The aim of this study was to develop a evaluation indicator to collaborative energy saving projects with NGO. We set the indicator based on expert advice, and refer to the preceding case study. The indicator has been set for the purpose of analyzing in planning, execution, performance phase to projects. In planning phase these consist of indicator such as project selection and rating, projects goals and concrete plans, etc; and systematic way of projects promotion, projects management and follow-up, and participation on selected contents, etc in execution phase; and achieve their goals, participant satisfaction, etc in performance phase.
The Newest Technology Development and Commercialization Status of Coal Gasification
Lee, Jin-Wook ; Yun, Yongseung ; Kang, Won-seok ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 150~163
DOI : 10.5855/ENERGY.2015.24.3.150
Gasification technology is one of the representative next-generation fossil fuel utilization technologies, converting low grade fossil fuels such as coal, heavy residue oil, pet-coke into highly clean and efficient energy sources. Accordingly, related market demand for gasification technology is ever increasing steadily and rapidly. A few years ago, conventional pulverized coal utilization technology had an edge over the gasification technology but the most significant technical barrier of limited capacity and availability has been largely overcome nowadays. Futhermore, it will be more competitive in the future with the advancement of related technologies such as gas turbine, ion transfer membrane and so on. China has recently completed a commercialization-capable large-scale coal gasification technology for its domestic market expansion and foreign export, rapidly becoming a newcomer in the field and competing with existing US and EU technical leadership at comparable terms. Techno-economic aspect deserves intensive attention and steady R&D efforts need to continue in organized, considering that gasification technology is quite attractive combined with
capture process and coal to SNG plant is economically viable in Korea where natural gas is very expensive. In the present paper, recent technology development and commercialization trend of many leading companies with coal gasification expertise have been reviewed with significant portion of literature cited from the recently held `2014 Gasification Technology Conference`.
The Supply Shortage Effects of Oil Refinery Industry in Korea
Cho, Yong-Cheol ; Lee, Yong-Hwan ; Yoo, Seung-Hoon ;
Journal of Energy Engineering, volume 24, issue 3, 2015, Pages 164~172
DOI : 10.5855/ENERGY.2015.24.3.164
As the petroleum products produced from the Oil refinery industry (ORI), a national key industry in Korea, are supplied to other industries as an intermediate goods, the supply shortage of ORI has a large impact on the national economy. This paper attempts to analyze the supply shortage effects which are defined as the negative impact of one won of supply failure in the ORI on the production of other industries. To this end, an inter-industry analysis using an input-output (I-O) table describing inter-industry flow of intermediate goods is applied. More concretely, the supply-driven model is employed over the period 1990-2012. In addition, the results are compared with those for shipbuilding, semiconductor, and steel industries. The results show that the supply shortage effects are computed to be 0.9205 won when using 2012 I-O table. More specifically, the supply shortage effects on chemical products and transportation industries are computed to be 0.2113 and 0.1140, which are relatively large, The supply shortage effect of ORI is smaller than that of steel industry (1.4131 won), but larger than that of shipbuilding industry (0.0586 won) and that of semiconductor industry (0.1111 won).