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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Energy Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Energy Engineering
Editor in Chief :
Volume & Issues
Volume 22, Issue 4 - Dec 2013
Volume 22, Issue 3 - Sep 2013
Volume 22, Issue 2 - Jun 2013
Volume 22, Issue 1 - Mar 2013
Selecting the target year
A Comparative Study on Heating Energy Consumption for Apartment Based on the Annually Strengthened Criteria of Insulation
Kim, Dae-Won ; Chung, Kwang-Seop ; Kim, Young-Il ; Kim, Sung-Min ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 83~89
DOI : 10.5855/ENERGY.2013.22.2.083
Energy consumption is closely related to our lives. As Korea has four seasons, heating and cooling system is considered as essential facilities for the residential buildings. Accordingly, the government has continuously strengthened the design criteria to improve energy for new and existing building to save energy. The most important factor in the energy efficiency analysis for apartment is the heat transmission coefficient, and the value is significantly different as the heating energy amount is greatly different according to the window area ratio versus facade area ratio. Therefore, it is time to conduct continuous set-up for goal to enhance efficiency and restriction on window area ratio versus facade area ratio.
A Study on the Evaluation Method for Professional ESCO
Lim, Ki Choo ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 90~95
DOI : 10.5855/ENERGY.2013.22.2.090
The paper is aimed at evaluation method for technology-focused professional ESCO. We set up some premise about the evaluation indicators, there are such as the financial soundness, energy savings performance excellence, customer satisfaction, source technology vendor`s participation, and guaranteed savings contract. The evaluation indicators consist of the evaluation of expertise (40points), management state (15points), customer satisfaction (20points), technical skills (25points), and detailed indicators were determined. We can apply technology categories such as lighting, cogeneration, process improvement, waste heat recovery, cooling & heating equipments.
Performance test of double swirl burner for the development of pilot scale compact gasifier
Kang, Suk-Hwan ; Ryu, Jae-Hong ; Chung, Seok-Woo ; Jung, Woo-Hyun ; Yoo, Sang-Oh ; Lee, Do-Yeon ; Yun, Yongseung ; Lee, Jin-Wook ; Kim, Gyoo-Tae ; Yi, Min-Hoe ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 96~104
DOI : 10.5855/ENERGY.2013.22.2.096
Coal gasification is considered as one of the best alternatives among clean coal technology and new concept next generation technologies are under being developed to achieve low cost as well as high efficiency. In this study we have developed double swirl multi-burner as part of the development of low cost compact gasifier. We installed new concept multi-burner with pulverized coal distributor to the body of existing gasifier for burner test. Gasification test was performed under the condition of
by using Indonesian ABK (sub-bituminous) coal to get operation condition of new concept multi-burner. Our interest was focused to ensure a stable operating condition rather than the gasifier performance evaluation. As a result, we were able to achieve the carbon conversion of 84% and the cold gas efficiency of 52.1% at the stable operating conditions.
A Study on the Heat Loss Improvement in a Refrigerator Ice Dispenser by Using Reverse Heat Loss Method
Ha, Ji Soo ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 105~111
DOI : 10.5855/ENERGY.2013.22.2.105
The present study has been carried out to reduce the heat loss from a built in refrigerator by using reverse heat loss method to discern the region with larger heat loss. To perform this purpose, an infrared thermographic camera has been used to measure the surface temperature of the refrigerator and tried to improve the heat loss near the ice dispenser. The numerical heat transfer analysis also has been accomplished to clarify the heat transfer mechanism near the ice dispenser. The possible applicable method to reduce heat loss was increasing the curvature radius at the ice dispenser corner. The curvature radius has been changed from 0mm to 40mm to see the effect of the curvature at the corner. From the present research, the optimal curvature radius for the reduction of heat loss at the ice dispenser could be 30mm.
Study on Analysis and Evaluation of Performance for Evacuated Tubular Solar Collector System
Chun, Tae-Kyu ; Ahn, Young-Chull ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 112~119
DOI : 10.5855/ENERGY.2013.22.2.112
The thermal performance for test system with evacuated tubular solar collector is experimentally investigated to obtain the basis data for developing new type solar collector. For this purpose, the test system was designed using CATIA and then after being manufactured, the system was tested using evacuated tubular solar collector. Numerical analysis, furthermore, was performed using ANSYS Fluent V.13 for glass evacuated tubular solar collector. The results showed that as setting temperature difference(
) of system was increased, total operating(working) time was almost same in all cases, even though operating count was decreased. The results of numerical analysis showed that as temperature of solar absorber in glass evacuated tubular solar collector was high, the drop-rate of temperature of center part was increased.
Heat Transfer and Pressure Drop of Cross-flow Heat Exchanger on Modules Variation
Kim, Jong-Min ; Kim, Jinsu ; Yu, Byeonghun ; Kum, Sungmin ; Lee, Chang-Eon ; Lee, Seungro ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 120~127
DOI : 10.5855/ENERGY.2013.22.2.120
This study investigated the characteristics of heat transfer and pressure drop for cross-flow heat exchanger of premixed combustion system. The premixed burner was in front of a heat exchanger, and the number of heat exchanger modules was changed to investigate the characteristics of NOx and CO emissions with various equivalence ratios. In addition, the effectiveness, entropy generation and pressure drop were calculated by various number of heat exchanger modules and the performance of heat exchanger was analyzed by the exergy loss.
Examination of validation for equivalent gas to replace natural gas
Kim, Jong-Min ; Lee, Seungro ; Lee, Chang-Eon ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 128~135
DOI : 10.5855/ENERGY.2013.22.2.128
In order to estimate the combustion characteristics and the gas interchangeability for natural gas with various compositions per each production area, equivalent gas are using to replace natural gas. It is known that an equivalent gas has the same the heating value, the compression factor, the relative density, CO emission and the burning velocity as the original natural gas. However, it is not reported that the flame shape and thermal efficiency and NOx emission by real gas appliance. In this study, equivalent gas was examined the validation to replace natural gas. The CO emission the burning velocity and the flame temperature were reconfirmed, and the flame shape, the NOx emission and the thermal efficiency were numerically and experimentally investigated. As results, there was not a large difference between natural gas and equivalent gas. This result demonstrated that there was no problem using equivalent gas to replace natural gas.
EMISSION ANALYSIS OF A MEDIUM CAPACITY DIESEL ENGINE USING MAHUA OIL BIODIESEL
Sharma, Ajay Kumar ; Das, L.M. ; Naik, S.N. ; Chauhan, Bhupendra Singh ; Cho, Haeng Muk ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 136~140
DOI : 10.5855/ENERGY.2013.22.2.136
The stringent emission norms cannot be met through engine design and exhaust after treatment alone. Use of oxygenated fuel like biodiesel as a alternative to diesel may be the best way to reduce emissions today. In this study, Diesel fuel and pure biodiesel (mahua oil) were tested on a single cylinder naturally-aspirated direct-injection diesel engine. The study aims to investigate the effects of the mahua oil biodiesel on existing diesel engine emissions. The effect of test fuels on engine emissions like CO, HC,
, NOx and smoke emissions was investigated with respect to the load on engine. Smoke opacity of Diesel engine was lower in case of biodiesel of mahua oil as compare to mineral diesel. NOx emissions was little higher during the whole range of loading, which is a typical characteristic of biodiesel. However the increments are within in the narrow range.
emissions was bit higher which is the indication of better combustion due to presence of rich oxygen in the mixture, it results in the low values of CO and HC during the whole range of experiments. Thus considering environmental norms most of the engine emissions, it can be concluded and biodiesel derived from mahua oil could be used in a conventional diesel engine without any modification.
Households` willingness to pay for the residential electricity use
Lim, Seul-Ye ; Kim, Ho-Young ; Yoo, Seung-Hoon ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 141~147
DOI : 10.5855/ENERGY.2013.22.2.141
Electricity is a basis for human existence. This paper attempts to analyze the households` willingness to pay (WTP) for the residential electricity use. The WTP for the residential electricity use can be defined as the sum of actual price of and additional WTP for it. The former is easily observed in the market, but the second is not observed and thus should be obtained through a WTP survey of households. To this end, this study conducted a survey of randomly selected 1,000 households in Korea in November 2010. The results indicate that the mean additional WTP for the residential electricity use was estimated to be KRW 11.24 per kWh. Given that the average price of residential electricity was KRW 98.07 per kWh at the time of the survey, the economic benefit from the residential electricity use was computed as KRW 109.31 per kWh. This information can be compared with the cost involved in the supply of one kWh of residential electricity.
Stress Analysis of Expansion Transition Area in Steam Generator Tube of Optimized Power Reactor-1000
Kim, Young Kyu ; Song, Myung Ho ; Yoo, One ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 148~155
DOI : 10.5855/ENERGY.2013.22.2.148
The steam generators of OPR-1000 plants have Alloy 600 and Alloy 690 as the tube material and its tube expansion method is the explosive expansion method. According to the experience of these plants, circumferential cracks were largely occurred in steam generator tubes expanded by the explosive expansion method and their locations were the outer surface of tube expansion transition region surrounding with piled-up sludge. But even though tubes have the same conditions, tubes with the hydraulic expansion method shows the prevail trend of axial cracks compared to circumferential cracks. Therefore in this study, in order to identify the difference of such phenomena as above, configurations of tube and tubesheet were modeled and at operating conditions, stress values applied in the tube expansion transition area in accordance with tube expansion methods were calculated by using computational program and the direction and the predominance of cracks were evaluated.
3D Spatial Distribution Modeling for Petrophysical Property of Gas Hydrate-Bearing Sediment using Well Data in Ulleung Basin
Lee, Dong-Gun ; Shin, Hyo-Jin ; Lim, Jong-Se ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 156~168
DOI : 10.5855/ENERGY.2013.22.2.156
Drilling expedition #1 in 2007 and drilling expedition #2 in 2010 were performed for gas hydrate resources evaluation and optimal site selection of pilot test in Ulleung basin, East Sea, Korea. This study presents to build the 3D spatial distribution models using the estimated sedimentary facies, porosity, and gas hydrate saturation derived by well logs and core analysis data from UBGH1-4, UBGH1-9, UBGH1-10, UBGH1-14, UBGH2-2-1, UBGH2-2-2, UBGH2-6, UBGH2-9, UBGH2-10 and UBGH2-11. The objective of 3D spatial distribution modeling is to build a geological representation of the gas hydrate-bearing sediment that honors the heterogeneity in 3D grid scale. The facies modeling is populating sedimentary facies into a geological grid using sequential indicator simulation. The porosity and gas hydrate saturation modeling used sequential Gaussian simulation to populate properties stochastically into grid cells.
Experimental Study on the Regenerative Oxy-Fuel Combustion System with Ceramic Ball
Hong, Sung Kook ; Noh, Dong Soon ; Lee, Eun Kyung ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 169~174
DOI : 10.5855/ENERGY.2013.22.2.169
An experimental study has been conducted for the design of the regenerative oxy-fuel combustion system with ceramic ball. Various design parameters are considered such as ball size, regenerator weight, and combustion load. Regenerative system with a pair of oxygen burners and regenerators is set up and the temperature of oxygen and exhaust gas passing through ball regenerator is measured. It is shown that the temperature distributions with time are affected by ball diameter and regenerator weight, and the significant temperature change is observed by combustion load. As the ball size decreases and the regenerator weight increases, the regenerating temperature efficiency increases. It is found that the heat recovery ratio is low despites of high regeneration temperature efficiency.
Modeling of the dynamic behavior of a 12-V automotive lead-acid battery
Kim, Sung Tae ; Lee, Jeong Bin ; Kim, Ui Seong ; Shin, Chee Burm ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 175~183
DOI : 10.5855/ENERGY.2013.22.2.175
For the optimal design of the vehicle electric system, it is important to have a reliable modeling tool to predict the dynamic behavior of the automotive battery. In this work, a one-dimensional modeling was carried-out to predict the dynamic behaviors of a 12-V automotive lead-acid battery. The model accounted for electrochemical kinetics and ionic mass transfer in a battery cell. In order to validate the modeling, modeling results were compared with the experiment data of the dynamic behaviors of the lead-acid batteries of two different capacities that were mounted on the automobiles manufactured by Hyundai Motor Company. The discharge behaviors were measured with various discharge rates of C/3, C/5, C/10, C/20 and combination. And dynamic behaviors of charge and discharge were measured. The voltage curves from the experiment and simulation were in good agreement. Based on the modeling, the distributions of the electrical potentials of the solid and solution phases, and the current density within the electrodes could be predicted as a function of charge and discharge time.
The Economic Impacts of Marine Bio-energy Development Project
Kim, Tae-Young ; Jin, Se-Jun ; Park, Se-Hun ; Pyo, Hee-Dong ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 184~196
DOI : 10.5855/ENERGY.2013.22.2.184
We need to develop new renewable energy that could fundamentally replace fossil fuel, since the volume of economy and industry of our time becomes uncontrollably enormous. One of the alternative is to develop energy based on marine biomass, which would meet environment and energy needs at the same time. The marine bio-energy productions is supposed to occupy 50% to 500 million TOE in bio-energy production that is based on the Korean 3rd new renewable energy technology development, utilization, supply plan until 2030. This study attempts to apply input-output analysis to investigating the economic impacts of marine bio-energy development project in the Korean national economy. More specifically, this study shows what national economy effect of production-inducing effect, value-added inducing effect, employment-inducing effect, and R&D-inducing effect are explored with demand-driven model. Furthermore, this study attempts to define and classify the marine bio-energy development project sector from I-O table. Also, this study pays particular attention to marine bio-energy development project by taking the industry as exogenous specification and then investigating its economic impacts. The Marine bio-energy development project case 223 billion won, production-inducing effect, value-added inducing effect, and employment-inducing effect are 312 billion won, 87 billion won, 1,151 persons, and 5 billion won respectively. These quantitative information can be usefully utilized in the policy-making for the industrialization of marine bio-energy development project.
Experimental Study on the Cycle-to-Cycle Combustion Variations in a Spark Ignition Engine
Han, Sung Bin ; Hwang, Sung Il ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 197~204
DOI : 10.5855/ENERGY.2013.22.2.197
A cyclic variability has long been recognized as limiting the range of operating conditions of spark ignition engines, in particular, under idling conditions. The coefficient of variation (COV) in indicated mean effective pressure (IMEP) defines the cyclic variability in indicated work per cycle, and it has been found that vehicle drivability problems usually result. For analysis of the cyclic variations in spark ignition engines at idling, the results show that cyclic variability by the COV, COV of IMEP, the lowest normalized value (LNV), and burn angles can help to design the spark ignition engine.
Cycle-to-Cycle Fluctuations in a Spark Ignition Engine at Low Speed and Load
Han, Sung Bin ; Hwang, Sung Il ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 205~210
DOI : 10.5855/ENERGY.2013.22.2.205
Cycle-to-cycle variation has long been recognized as limiting the range of operating conditions of spark ignition engines, in particular, under lean and highly diluted operation conditions. At a part load, some of the cycles tend to knock, while others may have incomplete combustion by the time the exhaust valve opens. An experimental study has been performed in order to evaluate the relative contribution of several relevant parameters on the cyclic variability in spark ignition engines. In general, the stability of engine operation is improved with fuel injector according to the optimal injection timing, but the stability of engine operation at idle is not improved compared with a practical gasoline engine. In this study, we investigated the relationship of the effect of operating conditions for the stability at low speed and load.
Heat Consumption Pattern Analysis by the Component Ratio of District Heating Users
Lee, Hoon ; Lee, Min-Kyun ; Kim, Lae Hyun ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 211~225
DOI : 10.5855/ENERGY.2013.22.2.211
To run an optimal operation of Integrated energy supply facilities, we need to analyze heat consumption patterns of District heating users and derive optimum and maximum load ratio of heat production facilities unit. This study selects three District heat production facilities. It also classifies District heating users into residential apartment buildings and eight non-residential buildings and analyzes heat consumption results for an year. Finally it carries out the analysis of how the ratio change of each type affects maximum load ratio, facility utilization ratio, heat supply range. According to this study, three different District heat facilities of residential apartment building show similar daily and annual heat consumption patterns. Annual average load ratio, maximum load ratio and annual heat demand increase as outdoor temperatures decrease. Non-residential buildings in urban District focused on apartment buildings display similar by the daily and annual heat consumption patterns. Yet their daily and annual maximum load ratio differ according to outdoor temperature, District, building types and their composition ratio. In the case of urban District focused on apartment buildings reach optimum and maximum load ratio when apartment buildings reaches 60-70% of the total. At that point heat supply range becomes maximized and the most economic efficiency is obtained.
A Comparison with CFD Simulation and Experiment for Steam-methane Reforming Reaction in Double pipe Continuous Reactor
Shin, Dong-Woo ; Kim, Lae Hyun ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 226~236
DOI : 10.5855/ENERGY.2013.22.2.226
The heat distribution and internal flow from the efficiency of actual reformer and specification variation, using the computer simulation and experiment about the steam methane reforming reaction which uses the high temperature reformer. Reaction model from steam refoemer uses the steam response model developed by Xu & Froment.As result we supposed the chemical react Steam Reforming(SR), Water Gas Shift(WGS), and Direct Steam Reforming(DSR) from the inner high temperature reformer dominates the response has dissimilar response. According to result of steam methane reforming reaction exam using high temperature reformer, we figured out when Steam Carbon Ratio(SCR) increase, number of hydrogen yield increases but methane decreases. When comparing and examining between design with one inlet and two inlet, result came out one inlet design is more outstanding at thermal distribution and internal flow, hydrogen yield in one inlet design than two inlet design.
The study on performance of characteristics in engine oil by vehicle driving
Lee, Joung-Min ; Lim, Young-Kwan ; Jung, Choong-Sub ; Kim, Ye-Eun ; Han, Kwan-Wook ; Na, Byung-Ki ;
Journal of Energy Engineering, volume 22, issue 2, 2013, Pages 237~244
DOI : 10.5855/ENERGY.2013.22.2.237
The engine oil is used for lubrication of various internal combustion engines. Recently, the vehicle and engine oil manufacture usually guarantee for oil change over 15000~20000 km mileage, but the most of driver usually change engine oil every 5000 km driving in korea. It can cause to raise environmental contamination by used engine oil and increase the cost of driving by frequently oil change. In this study, we investigate the various physical properties such as flash point, pour point, kinematic viscosity, cold cranking simulator characteristics, total acid number, four-ball test and concentration of metal component for fresh engine oil and used engine oil after real vehicle driving (5000 km, 10000 km). The result showed that the total acid number, wear scar diameter by four-ball test, Fe and Cu had increased than fresh engine oil, but 2 kind of used oil (5000 km and 10000km) had similar physical values and concentration of metal component.