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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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Assessment of the MELCOR 1.8.6 condensation heat transfer model under the presence of noncondensable gases
Yoo, Ji Min ; Lee, Dong Hun ; Yun, Byong Jo ; Jeong, Jae Jun ;
Journal of Energy Engineering, volume 25, issue 2, 2016, Pages 1~20
DOI : 10.5855/ENERGY.2016.25.2.001
A condensation heat transfer model is very important for the safety analysis of nuclear power plants. Especially, condensation under the presence of noncondensable gases (NCGs) is an important issue in nuclear safety because the presence of even a small quantity of NCGs in the vapor largely reduces the condensation rate. In this study, the condensation heat transfer model of the severe accident analysis code MELCOR 1.8.6 has been assessed using a set of condensation experiments performed under the thermal-hydraulic conditions similar to those inside a containment during design-basis accidents or severe accidents. Experiment conditions are categorized into 4 types according to the shape of the condensation surface: vertical flat plates, outer surface of vertical pipes, inner surface of vertical pipes, the inner surface of horizontal pipes. The results of the calculations show that the MELCOR code generally under-predicts the condensation heat transfer except the condensation on inner surface of vertical pipes.
Optimization Design of Commercial Large Gas Oven Systems
Kim, Do-Hyun ; Yu, Byeonghun ; Kum, Sungmin ; Lee, Chang-Eon ;
Journal of Energy Engineering, volume 25, issue 2, 2016, Pages 21~28
DOI : 10.5855/ENERGY.2016.25.2.021
This research was conducted for the optimal design of large commercial gas oven system. Equivalent ratio was determined through a numerical analysis and experiments on the combustion condition of the combustor. After reviewing the supply capacity of burner(20,000 kcal) and control method of convection fan, two types of heat exchangers designed. In order to maintain a uniform temperature inside the oven is required convection fan braking system. The center temperature in the oven rises more rapidly when the convectional fan is rotated in the counterclockwise direction than the counter-clockwise direction. And The efficiency of the system by installing a large heat transfer area was higher.
Numerical study on effect of intake valve timing on characteristics of combustion and emission of Natural gas-Diesel engine
Jung, Jaehwan ; Song, Soonho ; Hur, Kwang beom ;
Journal of Energy Engineering, volume 25, issue 2, 2016, Pages 29~36
DOI : 10.5855/ENERGY.2016.25.2.029
In this study, diesel/natural gas dual-fuel engine was studied numerically using DoE method. The engine is CI engine for power generation and modelled by 1-D simulation GT-power. The combustion and emission characteristics were analyzed as a function of IVO, IVC and the ratio of natural gas to total fuel enegy. As the proportion of natural gas increases, the BSFC(Brake specific fuel consumption) is increased and BSNOx(Brake specific NOx) is decreased. If specific valve timing to improve the BSFC is applied to the engine, the BSFC is decreased by 1% and simultaneously BSNOx is decreased by 36%.
Estimation of the electricity demand function using a lagged dependent variable model
Ahn, So-Yeon ; Jin, Se-Jun ; Yoo, Seung-Hoon ;
Journal of Energy Engineering, volume 25, issue 2, 2016, Pages 37~44
DOI : 10.5855/ENERGY.2016.25.2.037
The demand for electricity has a considerable impact on various energy sectors since electricity is generated from various energy sources. This paper attempts to estimate the electricity demand function and obtain some quantitative information on price and income elasticities of the demand. To this end, we apply a lagged dependent variable model to derive long-run as well as short-run elasticities using the time-series data over the period 1991-2014. Our dependent variable is annual electricity demand. The independent variables include constant term, real price of electricity, and real gross domestic product. The results show that the short-run price and income elasticities of the electricity demand are estimated to be -0.142 and 0.866, respectively. They are statistically significant at the 5% level. That is, the electricity demand is in-elastic with respect to price and income changes in the short-run. The long-run price and income elasticities of the electricity demand are calculated to be -0.210 and 1.287, respectively, which are also statistically meaningful at the 5% level. The electricity demand is still in-elastic with regard to price change in the long-run. However, the electricity demand is elastic regarding income change in the long-run. Therefore, this indicates that the effect of demand-side management policy through price-control is restrictive in both the short- and long-run. The growth in electricity demand following income growth is expected to be more remarkable in the long-run than in the short-run.
Design of the Heat Exchanger in Pool Water Management System of a Research Reactor and Estimation of the Pool Water Temperature Using CFD
Jeong, Namgyun ;
Journal of Energy Engineering, volume 25, issue 2, 2016, Pages 45~51
DOI : 10.5855/ENERGY.2016.25.2.045
The pool water management system, which is installed for purification of the coolant in the pools and the primary cooling system of a research reactor, removes the decay heat from the reactor core when the primary cooling system stops. It also removes the heat generated from the irradiated objects in the service pool and the spent fuels in the spent fuel storage pool to keep the temperature of the pools within a limited value. In this study, the heat exchanger of the pool water management system is designed by CFD method using a commercial code Flowmaster, and the temperature of the pools is estimated along the time to conclude the design and operation method of the pool water management system.
Technical Review on Thorium Breeding Cycle
Noh, Taewan ;
Journal of Energy Engineering, volume 25, issue 2, 2016, Pages 52~64
DOI : 10.5855/ENERGY.2016.25.2.052
The production of nuclear energy from thorium which is non-fissile material was a main issue until the middle of 1970's, because of the thorium's abundance as energy resources, its capability of breeding fissile material U233, and the reduction of long-lived actinides. However, to use thorium as nuclear fuel, some obstacles such as the necessities of external neutron source and long-term neutron irradiation for effective breeding, and the production of high radioactive isotopes in the course of thorium breeding cycle should be overcome. The difficulties to resolve these cons of thorium cycle became the reason of interruption of the related researches in the middle of 1970's. But in the 21st century, the change of societal perspective regarding nuclear energy and the appearance of accelerator-driven nuclear reactor shift those cons into pros and rehabilitate the study of thorium. The high activity of thorium cycle turned out to be a good option as higher resistance and easier detectibility of nuclear proliferation and the employment of subcritical accelerator-driven reactor as external neutron sources is considered to enhance the nuclear safety. In this study we compare the thorium cycle with the currently-used uranium cycle and analyze the technical status and perspective of thorium researches which use accelerator-driven reactors.
Synthesis of highly crystalline nanoporous titanium dioxide at room temperature
Chung, Pyung Jin ; Kwon, Yong Seok ;
Journal of Energy Engineering, volume 25, issue 2, 2016, Pages 65~78
DOI : 10.5855/ENERGY.2016.25.2.065
Initial studies of the photocatalyst has been developed from the field relating to the conversion and storage of solar energy. Recently, the study of the various organic decomposition compound and the water purification and waste water treatment by ultraviolet irradiation in the presence of light or a photocatalyst are being actively investigated. In addition, the oxidized material-carbon nanotubes, graphene-nanocomposites have been studied. Such a complex is suitable as a material constituting the solar cells and photolysis nanoelectronics, including the flexible element due to thermal and chemical stability.
Energy Demand Management Algoritm for Buildings and Application Procedure
Kim, Jeong-Uk ;
Journal of Energy Engineering, volume 25, issue 2, 2016, Pages 79~85
DOI : 10.5855/ENERGY.2016.25.2.079
This paper presents an advanced energy demand management for buildings. It is important to aggregate a various demand side resource which is controllable on demand response environment. Previous demand side algorithm for building is mostly restricted on single building. In this paper, we suggest energy demand management algorithm for many buildings. And, this paper shows the procedure to apply suggested demand management algorithm.
A Study on the Optimization of Ventilation Fan Position and Flow Rate for a Turbine Building of a Power Plant
Kim, T.K. ; Ha, J.S. ; Park, C.H. ;
Journal of Energy Engineering, volume 25, issue 2, 2016, Pages 86~93
DOI : 10.5855/ENERGY.2016.25.2.086
The existence of high temperature equipment such as steam pipe, deaerator, steam storage tanks and main steam stop valves makes relatively higher workplace temperature in a power plant of the turbine building. In order to cool down the air temperature in the turbine building, the outside air flow with lower temperature passes through the window and the hotter air in the building is extracted to the outside by installing the ventilation fan on the roof. Nevertheless, higher temperature regions near the high temperature equipment still exist in the turbine building and additional fans for the temperature reduction in the higher temperature region should be examined for the optimal location and mass flow rate. The purpose of the present study is to suggest the optimized location and capacity of the additional ventilation fans for a comfortable working environment. From the present study, it has been elucidated that the additional ventilation fans might be located near the high temperature deaerator and it could reduce the mean temperature in the turbine building by
and the temperature near the deaerator could be reduced by
A Research on PV-connected ESS dissemination strategy considering the effects of GHG reduction
Lee, Wongoo ; KIM, Kang-Won ; KIM, Balho H. ;
Journal of Energy Engineering, volume 25, issue 2, 2016, Pages 94~100
DOI : 10.5855/ENERGY.2016.25.2.094
ESS(Energy Storage System) is an important source that keeps power supply stable and utilizes electricity efficiently. For example, ESS contributes to resolve power supply imbalance, stabilize new renewable energy output and regulate frequency. ESS is predicted to be expanded to 55.9GWh of installed capacity by 2023, which is 30 times more than that of 2014. To raise competitiveness of domestic ESS industry in this increasing world market, we have disseminated load-shift ESS for continuous power supply imbalance with FR ESS, and also necessity to secure domestic track record is required. However in case of FR ESS, utility of installing thermal power plant is generally generated within 5% range of rated capacity, so that scalability of domestic market is low without dramatic increase of thermal power plant. Necessity of load-shift ESS dissemination is also decreasing effected by surplus backup power securement policy, raising demand for new dissemination model. New dissemination model is promising for
reduction effect in spite of intermittent output. By stabilizing new renewable energy output in connection with new renewable energy, and regulating system input timing of new renewable energy generation rate, it is prospected model for 'post-2020' regime and energy industry. This research presents a policy alternatives of REC multiplier calculation method to induce investment after outlining PV-connected ESS charge/discharge mode to reduce GHG emission, This alternative is projected to utilize GHG emission reduction methodology for 'Post-2020' regime, big issue of new energy policy.