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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
Experiment Research for Wax Appearance Temperature Determination of Opaque Oil
Kang, Pan-Sang ; Hwang, Soon-Hye ; Son, Bi-Ryong ; Lim, Jong-Se ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 1~8
DOI : 10.5855/ENERGY.2015.24.2.001
Wax deposition hinders oil flow assurance. Huge amount of money and time were required for mitigation of wax deposition in the oil field. For prediction and mitigation of wax deposition problem, Wax Appearance Temperature(WAT), which is the temperature at which the first wax crystals start to form, needs to be measured in advance. There is a standard method which is optical way to measure the WAT of transparent oil. However, standard method cannot be applied to opaque oil which is common produced oil in the field. In this study, WAT of three transparent oil samples were measured using heat flux variation analysis, viscosity variation analysis and density variation analysis, and compared with WAT measured by standard method. As a result, WAT measured by density variation analysis is the more reliable than heat flux variation analysis and viscosity variation analysis. WAT of two opaque oils were measured using density variation analysis.
Assessment of the Economic Benefits from Electricity Consumption
Lim, Seul-Ye ; Park, Jae-Hyung ; Yoo, Seung-Hoon ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 9~16
DOI : 10.5855/ENERGY.2015.24.2.009
As electricity is an indispensable input to human's existence and industrial production, economic benefits arise from consumption. The economic benefits of the electricity consumption are useful information in various fields of electricity-related policy. Therefore, this study attempts to value the economic benefits from electricity use. The economic benefit of electricity consumed is the area under the demand curve which made of the sum of the actual consumer expenditure and the consumer surplus. Consumer expenditure can be easily observed but the information on price elasticity of demand is necessarily required to compute consumer surplus. This study derives the estimates for price elasticities through literature review. The price elasticities of the electricity demand for residence, industry, and commercial are estimated to be -0.332, -0.351, and -0.263, respectively. Because the consumer surplus of the electricity consumption for residence, industry, and commercial are computed to be 191.54, 143.44, and 231.91 won per kWh, respectively. Given that average prices of electricity use were 127.02, 100.70, and 121.98 won per kWh for the year 2013, the economic benefit are calculated to be 318.56, 244.14, and 353.89 won per kWh, respectively. We can convert the values to 321.96, 246.75, and 357.67 won per kWh in 2014 constant price, respectively, using consumer price index. They can be used in the economic feasibility analysis of a new electricity supply project.
Design of Multistage Orifices for PIC System in Nuclear Reactor
Shin, J.C. ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 17~21
DOI : 10.5855/ENERGY.2015.24.2.017
Restriction orifices in the feed and bleed circuit of nuclear power plant are designed using computer program capable of handling multiple hole cascade orifice assembly. Single hole stages of orifice assembly are alternated with multihole stages where necessary. The distance between stages is such that it allows full pressure recovery. The minimum static pressure is higher than vapor pressure at the operating temperature so that cavitation does not occur. Piping sizes are reviewed and increased if necessary to improve rigidity.
An Analysis on the Determinants of Technological Level in Korean Waste-to-Energy Firms
Kim, Geun-U ; Yun, Hye-ri ; Park, Jung-Gu ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 22~33
DOI : 10.5855/ENERGY.2015.24.2.022
This study analyzes the technological level of Korean waste-to-energy(WTE) firms and its determinants by using a multiple logistic regression analysis based on a survey. As the results of analysis, the technological level of Korean WTE firms has been positively influenced by the firm size, R&D expenditures, R&D manpower, but negatively influenced by the competition in domestic market. Also there is no significant effect of the economy of scale. The policy implications of this study are as follows; First, the system in which stakeholders coevolve should be set up to prevent excessive market competition from having a bad effect on the technological level of Korean WTE firms. Second, it is needed to make an effort to achieve the economy of scale by increasing an output and decreasing cost in WTE firms.
The Characteristics of Hydrogen Production According to Electrode Materials in Alkaline Water Electrolysis
Moon, Kwangseok ; Pak, Daewon ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 34~39
DOI : 10.5855/ENERGY.2015.24.2.034
This study confirmed the characteristics of hydrogen production according to electrode materials by producing non-diaphragm alkaline water electroanalyzer that can be controlled at medium temperature to produce hydrogen. As a result of the electrochemical characteristics by electrode material (
, Ti), the highest efficiency was found in
, as a result of hydrogen production experiment by electrolyte concentration, electrolyte concentration has a tendency to be proportional to hydrogen production and the condition of 30% KOH showed the highest hydrogen production as
. In the experiment that confirmed hydrogen production according to electrode materials, in case of combination of anode (
) and cathode (
), it was
that showed a higher hydrogen production by around 6.97% than that of
and cathode. It is presumed that the improvement of electrochemical activation of DSA electrode increases hydrogen production and influences the improvement of durability compared to the former electrode so that it enables stable alkaline water electrolysis.
The Sensitivity Analysis for LRV Opening Pressure in CANDU
Kim, S.M. ; Kho, D.W. ; You, S.C. ; Kim, J.H. ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 40~44
DOI : 10.5855/ENERGY.2015.24.2.040
Sensitivity on the reactor safety was evaluated for the safety margin and time delay applied to the opening pressure of liquid relief valve(LRV) of the primary heat transport system(PHTS) in the pressurized heavy water reactor(PHWR) type nuclear power plant. Since the LRV is the pressure boundary for the PHTS in the safety analysis, the operating of LRV has a significant effect on the safety analysis results. Therefore it is required during the regulatory review of Wolsong Unit 1 safety analysis to find the safety effect of the application of safety margin and time delay to the LRV opening pressure for the safety analysis of PHTS pressurizing events.
A Study of renewable energy optimal design using the LCC analysis
Song, Ho-Yeol ; Kim, Jeong-Uk ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 45~50
DOI : 10.5855/ENERGY.2015.24.2.045
In Korea ranking sixth out of The world's greenhouse gas emissions, all Korean public buildings have to implement obligatorily renewable energy systems for energy production to reduce the greenhouse gas emissions from the energy consumed in operation, maintenance and management of buildings. The optimum combination and application rates for each energy source emerge from analyzing the trend of previous studies and the energy consumption is simulated by using a dynamic energy simulation program and the initial investment costs, the energy costs, the maintenance costs, the replacement costs emerge based on the calculated result. The result show that the total life cycle cost of 100% gerthermal is the lowest with \ 2,105,974,344 on the analysis results.
Cost effective and low energy consuming hydrothermal synthesis of Ni based MOF
Israr, Farrukh ; Kim, Duk Kyung ; Kim, Yeongmin ; Oh, Seung Jin ; Ng, Kim Choon ; Chun, Wongee ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 51~54
DOI : 10.5855/ENERGY.2015.24.2.051
The mesoporous metal organic framework structure of Ni-BTC was successfully synthesized in a low temperature and short operation time via hydrothermal synthesis process. Such operational route virtuously consumed less electrical and thermal energy. It proved time saving along with acceptable product yield (38%). The product was characterized through FESEM, FT-IR, XRD and
gas adsorption measurement. Hightemperature stability of synthesized MOF was gauged by diffraction indexing of XRD patterns of as synthesized and heat treated samples of MOFs. The mathematically calculated particle size of Ni-BTC was found to be 42nm.
Hydrothermal Synthesis of Fe Based MOFs with Energy Economy Approach
Israr, Farrukh ; Kim, Duk Kyung ; Kim, Yeongmin ; Oh, Seung Jin ; Ng, Kim Choon ; Chun, Wongee ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 55~58
DOI : 10.5855/ENERGY.2015.24.2.055
The mesoporous metal organic framework structure Fe-BTC was successfully synthesized by hydrothermal process with noticeable yield. The synthesis operation was conducted at intermediate temperature and for shortened operation time as compared to conventional procedures. This process approach with reduced operating temperature and shortened operation time may open an opportunity window towards process economy with reduction in energy consumption. A simple mathematical approach of diffraction indexing using X-ray diffraction patterns of synthesized powder was employed to confirm its crystalline nature and to investigate its high temperature stability. The crystallite size was calculated by using Debye-Scherrer equation.
A Comparative Analysis on the Economic Effects of the Electricity Industry of Korea and Japan
Lee, Seung-Jae ; Euh, Seung Seub ; Yoo, Seung-Hoon ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 59~71
DOI : 10.5855/ENERGY.2015.24.2.059
This study attempts to examine the economic impacts of electricity industry in Korea and Japan using an inter-industry analysis. Specifically, the study analyzes and compares electricity industry between Japan and Korea through production-inducing effect and value added inducing effect of electricity industry based on demand-driven model. Moreover, this study deals with supply shortage effect and sectoral price effect by using supply-driven model and Leontief price model, respectively. This study analyses the electricity industry through exogenous approach. The results show that electricity industry induces prodution-inducing effect of 0.5946 won in other industries in Korea and 0.5446 yen in other industries in Japan. Value-added-inducing effects are 0.1716 won in other in other industries in Korea and 0.2929 yen in other industries in Japan. Supply shortage effects of electricity industry are 1.5932 won in other industries in Korea and 1.2801 yen in other industries in Japan. And sectoral price effects are 0.2113% in Korea and 0.2196% in Japan due to the price increase of 10% of electricity industry.
Experimental Study of a Recuperator with Offset Strip Fins
Kim, Taehoon ; Do, Kyu Hyung ; Han, Yong-Shik ; Choi, Byung-Il ; Kim, Myungbae ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 72~78
DOI : 10.5855/ENERGY.2015.24.2.072
In the present study, a recuperator to improve the thermal efficiency of a micro gas turbine is considered. The counter flow plate-fin heat exchanger with offset strip fins is chosen as the type of the recuperator. From the optimization study as varying design parameters of the recuperator determined from the ideal cycle analysis, the internal structure of the recuperator is determined. The recuperator is made from stainless steel 304. In order to evaluate performance of the recuperator, experimental investigation is performed. The effects of inlet temperature of hot-side of the recuperator on the thermal performance of the recuperator are investigated. As a result, effectiveness of the recuperator obtained from the experiments is well consistent with that obtained from the correlations.
A Study on the Prediction of Hydrogen Vehicle by the Thermodynamic Properties
Han, Sung Bin ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 79~83
DOI : 10.5855/ENERGY.2015.24.2.079
Hydrogen has long been recognized as a fuel having some unique and highly desirable properties, for application as a fuel in engines. Hydrogen has some remarkably high values of the key properties for transport processes, such as kinematic viscosity, thermal conductivity and diffusion coefficient, in comparison to those of the other fuels. Such differences together with its extremely low density and low luminosity help to give hydrogen its unique diffusive and heat transfer characteristics. The thermodynamic and heat transfer characteristics of hydrogen tend to produce high compression temperatures that contribute to improvements in engine efficiency and lean mixture operation.
Combustion Characteristics of Hydrogen by the Thermodynamic Properties Analysis
Han, Sung Bin ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 84~90
DOI : 10.5855/ENERGY.2015.24.2.084
Hydrogen has some remarkably high values of the key properties for transport processes, such as kinematic viscosity, thermal conductivity and diffusion coefficient. Hydrogen, as an energy medium, has some distinct benefits for its high efficiency and convenience in storage, transportation and conversion. Hydrogen has much wider limits of flammability in air than methane, propane or gasoline and the minimum ignition energy is about an order of magnitude lower than for other combustibles. Statistical thermodynamics provides the relationships that we need in order to bridge this gap between the macro and the micro. Our most important application will involve the calculation of the thermodynamic properties of the ideal gas.
Development of a thermal-hydraulic analysis code for once-through steam generators using straight tubes for SMRs
Park, Youngjae ; Kim, Iljin ; Kang, Kyungjun ; Kang, Hanok ; Kim, Youngin ; Kim, Hyungdae ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 91~102
DOI : 10.5855/ENERGY.2015.24.2.091
A thermal-hydraulic design and performance analysis computer code for a once-through steam generator using straight tubes is developed. To benchmark the developed physical models and computer code, an once-through steam generator developed by other designer is simulated and the calculated results are compared with the design data. Also, the same steam generator is analyzed with the best-estimate thermal-hydraulic system code, MARS, for the code-to-code validation. The overall characteristics of heat transfer area, pressure and temperature distributions calculated by the developed code show general agreements with the published design data as well as the analysis results of MARS. It is demonstrated that the developed code can be utilized for diverse purposes, such as, sensitivity analyses and optimum thermal design of a once-through steam generator.
A study on the temperature distribution characteristics in the tube modules of a heat recovery steam generator ith the change of heat transfer modeling
Ha, Ji Soo ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 103~109
DOI : 10.5855/ENERGY.2015.24.2.103
A heat recovery steam generator consists of inlet expansion duct and heat transfer tube bank modules. For the enhancement of heat transfer in the tube bank modules, the flow should be uniform before the 1st heat transfer tube bank module. The present study has been carried out to analyze the flow characteristics in the inlet expansion duct of a heat recovery steam generator by using numerical flow analysis. The aim of the present study is to establish the proper heat transfer mechanism in the heat transfer tube bank modules by the comparison of the heat transfer models, the case with the constant heat loss per unit volume and the case with heat loss by using inner and outer convective heat transfer coefficient of heat transfer tube. From the present research, it could be seen that the heat transfer mechanism with using inner and outer convective heat transfer coefficient derives more proper temperature distribution results and the acceptance criteria of the temperature distribution within
before SCR is satisfied with using this heat transfer mechanism.
Numerical investigation of the recirculation zone formed downstream of a back ward facing step
Sarker, Konica ; Ali, Mohammad ; Cho, Haeng Muk ; Mahmud, Md. Iqbal ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 110~114
DOI : 10.5855/ENERGY.2015.24.2.110
A numerical investigation has been carried out on recirculation zone formed downstream of a compressible flow over a backward facing step. The study has been performed by solving Two-Dimensional Navier-Stokes equations. The system of governing equations has been solved, using an explicit Harten-Yee Non- MUSCL Modified flux type TVD scheme and a zero-equation algebraic turbulence model to calculate the eddy viscosity coefficient. The recirculation region dimensions are characterized over a range of Mach numbers of fixed step height 5mmThe detail of recirculation zone such as pressure, temperature, recirculation length, strength etc are reported. The variations of these characteristics due to change of Mach number are also presented.
A Study on the Analysis vibration of fluid flow in ECV
WANGWENHAI, WANGWENHAI ; Cho, Haeng Muk ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 115~119
DOI : 10.5855/ENERGY.2015.24.2.115
Pipe vibration caused great threat to the safety in production. Strong pipeline vibration will line accessories, especially the joints and pipe fittings etc. pipe joints loosening and rupture, causing serious accidents. By the action of the compressor constant fluid flow within the pipe, this process produces pulsating fluid flow may cause vibration of the pipe, thereby reducing the efficiency of the pipeline, structural vibration induced fatigue, thereby resulting in even piping structural damage. This paper studies on the vibration problems caused by fluid, by analyzing the causes of pipeline vibration and factors affecting pipeline vibrations, FEM (Finite Element Method) analysis of modal and enforced vibration.
A Study on Combustion Characteristics in terms of the Type of Fuel Supply Device (Feeder) of a Wood Pellet Boiler
Choi, Yun Sung ; Euh, Seung Hee ; Oh, Kwang Cheol ; Kim, Dae Hyun ; Oh, Jae Heun ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 120~128
DOI : 10.5855/ENERGY.2015.24.2.120
This study reports the combustion characteristics, such as burner temperature and the concentration of exhausted gas (
) due to the different types and pitches of the fuel supply feeder of the wood pellet boiler. The 1st grade wood pellets composed of mainly larch have been used for the experiment. In case of using the spring feeder, mean temperature of burner was approximately
, and the mean concentration of oxygen, carbon monoxide, carbon dioxide and nitrogen oxide were approximately 8.88%, 93.35ppm, 12.15% and 139.83 ppm, respectively. The test result with the spring feeder was shown to approach the condition of complete combustion compared to that of a screw feeder and were in good agreement with authentication judgement standard. Furthermore, the combustion efficiency was improved according to the growth of screw pitch. The control of air flow rate from the blower and ventilator is needed to achieve the complete combustion.
Study on the Application of V2G for Electric Vehicles in Korea Using Total Cost of Ownership Analysis
Kim, Younghwan ; Lee, Jae-Seung ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 129~143
DOI : 10.5855/ENERGY.2015.24.2.129
Increasing concerns on climate change and energy security accelerated policies to reduce green-house gas emission, especially from the transportation sector. Electric vehicle (EV) has been on the spotlight to deal with such environmental issue and V2G (Vehicle-to-Grid) technology began to draw attentions as an alternative to reduce ownership costs while contributing to an efficient and decentralized power grid. This study conducts a scenario analysis on total cost of ownership of EV under V2G scheme and compare with non-V2G EV and Internal Combustion Engine (ICE) vehicle. As result, V2G service is expected to provide an annual average profit of $210 to EV users willing to reverse flow its residual power in the battery. The profit from V2G service leaves a margin of $4,530 over operational lifetime, compared with $2,420 cost of charge for non-V2G EV. In summary, total cost of ownership of V2G-capable EV was 6.2% less than non-V2G EV and 10.2% higher than ICE vehicle. The results confirm a comparative economic advantage of operating EV under V2G scheme. Increased number of EVs with V2G service has shown to provide positive effects to power industry for valley filling in load distribution, thus, favorably increasing the overall economic feasibility.
A Study on the cold weather performance for diesel vehicle as fuel properties
Jang, Eun-Jung ; Kim, Sung-Woo ; Min, Kyung-Il ; Park, Cheon-Kyu ; Ha, Jong-Han ; Lee, Bong-Hee ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 144~153
DOI : 10.5855/ENERGY.2015.24.2.144
At low temperature, Wax build-up and settling can affect adversely the cold weather performance of the diesel vehicle. In this study, we test the cold properties of diesel by blending ratio of biodiesel, kerosene and WAFI. Also, we test the cold weather performance for diesel vehicle by fuel cold properties. Cold properties of diesel are improved by adding the WAFI, kerosene and get worse by adding the biodiesel. WAFI is effective to improve a cold filter plugging point(CFPP) and Kerosene is effective to improve a cloud point(CP). CFPP and pour point(PP) are related to cold weather performance of diesel vehicle but CP is unrelated. CFPP indicate a limit temperature of vehicle driving possibility.
TOP-MOUNTED IN-CORE INSTRUMENTATION : CURRENT STATUS AND TECHNICAL ISSUES
KIM, SUNG JUN ; KANG, TAE KYO ; CHO, YEON HO ; CHANG, SANG GYOON ; LEE, DAE HEE ; MAENG, CHEOL SOO ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 154~166
DOI : 10.5855/ENERGY.2015.24.2.154
The in-core instrumentation measures core power distribution and coolant temperature in local regions of the core in pressurized water reactors. The installation types are distinguished by the designs of routing paths that exit either through reactor bottom mounted instrument nozzles or through reactor top mounted instrument nozzles. Although each type has unique advantages, it is generally known that top mounted design is more competitive with respect to emphasizing nuclear safety issues and ability to cope with severe accidents. The international nuclear vendors have provided various types of reactors with top mounted design. Nuclear power reactors in Korea, however, only have been designed to be applicable to the use of bottom mounted design, and it has been pointed out that the capabilities of Korean reactors against severe accidents should be further enhanced. The paper deals with technical issues on reactor internal and external design, in-core instrumentation, support assembly, sealing mechanism with nozzles, handling, and analytical issues in order to establish the ways of development.
The effect of temperature on the electricity demand: An empirical investigation
Kim, Hye-min ; Kim, In-gyum ; Park, Ki-Jun ; Yoo, Seung-Hoon ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 167~173
DOI : 10.5855/ENERGY.2015.24.2.167
This paper attempts to estimate the electricity demand function in Korea with quarterly data of average temperature, GDP and electricity price over the period 2005-2013. We apply lagged dependent variable model and ordinary least square method as a robust approach to estimating the parameters of the electricity demand function. The results show that short-run price and income elasticities of the electricity demand are estimated to be -0.569 and 0.631, respectively. They are statistically significant at the 1% level. Moreover, long-run income and price elasticities are estimated to be 1.589 and -1.433, respectively Both of results reveal that the demand for electricity is price- and income-elastic in the long-run. The relationship between electricity consumption and temperature is supported by many of references as a U-shaped relationship, and the base temperature of electricity demand is about
. It is shown that power of explanation and goodness-of-fit statistics are improved in the use of the lagged dependent variable model rather than conventional model.
Wireless Power Transfer Technologies Trends
Eom, T.Y. ; Oh, C.S. ; Park, S.J. ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 174~178
DOI : 10.5855/ENERGY.2015.24.2.174
We have surveyed on technical method of wireless power transfer and have also surveyed on applications of the wireless charging for mobiles and of the wireless charging for electrical vehicle and electrical equipments. In this study, we have described about wireless power transfer and have analyzed and checked wireless power transfer prospects of applications and practical development.
A Study on Policy Recommendations for Post-Monitoring System of the Energy Efficiency Labeling Program
Lim, Ki Choo ;
Journal of Energy Engineering, volume 24, issue 2, 2015, Pages 179~186
DOI : 10.5855/ENERGY.2015.24.2.179
This study suggests a few solutions to improve the post-monitoring activities under the Energy Efficiency Labeling Program. First, samples should be selected from each category for the post-monitoring activities, taking account of the consumer's continuous buying behavior, while it is also important to form and operate a deliberation committee. Second, it is necessary to alleviate the checking process of the label content of 9 items which have never been violated the labeling regulation since 2005. This study suggests the detailed checking of label contents and the reinforcement of the measurement of 17 items which have violated labeling more than once over the past few years. Third, this study suggests that the entire post-monitoring process should be disclosed and be posted on the websites of related agencies and on the Internet in general.