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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 17, Issue 4 - Dec 2008
Volume 17, Issue 3 - Sep 2008
Volume 17, Issue 2 - Jun 2008
Volume 17, Issue 1 - Feb 2008
Selecting the target year
Current Status and Development Strategy for Energy Safety Technology
Choi, Jeong-Woo ; Yoon, Kee-Bong ;
Journal of Energy Engineering, volume 17, issue 4, 2008, Pages 175~181
Air Fuel Ratio Determination Method for Alternative Fuel Based on Carbon Balance and Linear Equation
Lee, Jae-Won ; Kwon, Soon-Tae ; Park, Chan-Jun ; Ohm, In-Young ;
Journal of Energy Engineering, volume 17, issue 4, 2008, Pages 182~188
This paper is to compare the carbon-balanced and liner air-fuel ratio determination methods for alternative fuels. In the previous work, expansion of Eltinge chart, unburned hydrocarbon compensation, comparison of the results from various methods were discussed. It has been also concluded that Eltinge method might be regarded as the most general equation of AFR determination among the existing ones. In the recent years, however, increasing demand for the environmental preservation, including global warming-up protection, and energy conservation lead to introduce the alternative fuel to the internal combustion engine. Therefore, the exact calculations of AFR for these fuels are needed. Especially, for the fuel that contains oxygen, all AFR calculation equations except Eltinge have to be re-formulated. In this paper, the AFR for alternative fuel were calculated by re-formulated carbon balance, accuracy of which was already confirmed, and linear equations, which are newly proposed by statistical method for each fuel. The results show that AFRs based on carbon balance have a little more error compared with gasoline, however, the accuracy is enough for this formula to apply to various fuel. The proposed linear equation also have excellent accuracy below
Fuel Concentration Measurements by Laser Rayleigh Scattering
Kwon, Soon-Tae ; Lee, Jae-Won ; Park, Chan-Jun ; Ohm, In-Young ;
Journal of Energy Engineering, volume 17, issue 4, 2008, Pages 189~197
In this study, a system to measure continuously the fuel concentration in a steady flow rig on the basis of Rayleigh scattering is presented. The system can be employed to measure both the temporal and the spatial distribution. Also, it is possible to calibrate the system for the measurement of accurate absolute concentration. Firstly, the system was tested at a calibration chamber for the determination of scattering cross section from propane, butane, acetylene, Freon-12 and Genetron 143a. After this, the system was adapted to a steady flow rig to measure the temporal and spatial fuel concentration. The rig is composed of cylinder head, intake manifold, injector, and transparent cylinder which can simulate internal combustion engine. To cope with the interference of Mie scattering, which is main obstacle of the measuring concentration with Rayleigh scattering, a hardware filter was installed for reducing the number density of particles. Furthermore a software filter was developed, which is based on the rise time and the time constant of the photomultiplier-amplifier system. In addition, background noisy was reduced by adjusting the optical array and applying the pin hall and beam trap. The results show that LRS can provide useful information about concentration field and the software filter is very effective method to remove Mie interference.
Development and performance analysis of a Miller cycle in a modified using diesel engine
Choi, Gyeung-Ho ; Poompipatpong, Chedthawut ; Koetniyom, Saiprasit ; Chung, Yon-Jong ; Chang, Yong-Hoon ; Han, Sung-Bin ;
Journal of Energy Engineering, volume 17, issue 4, 2008, Pages 198~203
The objective of the research was to study the effects of Miller cycle in a modified using diesel engine. The engine was dedicated to natural gas usage by modifying pistons, fuel system and ignition systems. The engine was installed on a dynamometer and attached with various sensors and controllers. Intake valve timing, engine speed, load, injection timing and ignition timing are main parameters. The results of engine performances and emissions are present in form of graphs. Miller Cycle without supercharging can increase brake thermal efficiency and reduce brake specific fuel consumption. The injection timing must be synchronous with valve timing, speed and load to control the performances, emissions and knock margin. Throughout these tested speeds, original camshaft is recommended to obtain high volumetric efficiency. Retard ignition timing can reduce
emissions while maintaining high efficiency.
Finite Element Analysis on Polyethylene Gas Pipes under External Loadings
Kil, Seoog-Hee ; Park, Kyo-Shik ; Kim, Ji-Yoon ;
Journal of Energy Engineering, volume 17, issue 4, 2008, Pages 204~211
Polyethylene(PE) pipes have been widely used as they are easy to construct and suitable for economical efficient when they are compared with metal pipelines. This paper studied the effect of various external loadings on stress and deflection of the buried PE pipes using Finite Element Method(FEM). For this purpose, stresses of buried PE pipes were calculated according to the loading condition such as pipe types(pipe diameter
), burial depths(
) and internal pressures(
). As a result, it was founded the effect and relation with each of loading conditions under the buried condition.
Safety Evaluation of Non-refillable Butane Can Equipped with Relief Valve for Prevention of Explosion
Kang, Seung-Kyu ; Choi, Kyung-Suhk ;
Journal of Energy Engineering, volume 17, issue 4, 2008, Pages 212~217
This study carried out the safety evaluation of non-refillable butane can for portable gas range equipped with relief valve for prevention of explosion. The can is heated by electric heater at the real using condition and the extreme condition after installing at a portable gas range for checking the operating pressure and the evaluating suitability of releasing flux. And the possibility of fire or explosion was tested when the gas was released from the relief valve at the real condition. As a result of this safety evaluation test, a non-refillable butane can with relief valve prevents the can from exploding by control of internal pressure.
The Semi-Implicit Numerical Scheme for Transient Two-Phase Flows on Unstructured Grids
Cho, H.K. ; Park, I.K. ; Yoon, H.Y. ; Kim, J. ; Jeong, J.J. ;
Journal of Energy Engineering, volume 17, issue 4, 2008, Pages 218~226
A component-scale two-phase analysis code has been developed for a realistic simulation of two-phase flow transients in a light water nuclear reactor component. In the code, a two-fluid three-field model is adopted and the governing equations are solved on an unstructured mesh. For the numerical solution scheme, the semi-implicit method used in the RELAP5 code was selected, which has been proved to be very stable and accurate for most of practical applications. However, some modifications were needed for its application to an unstructured non-staggered grid. This paper presents the modified semi-implicit numerical method for unstructured grid and the preliminary results of the calculations.
emission and fuel consumption rate according to used fuels at driving mode
Kim, Yong-Tae ; Lee, Ho-Kil ; Kang, Jeong-Ho ; Han, Sung-Bin ; Chung, Yon-Jong ;
Journal of Energy Engineering, volume 17, issue 4, 2008, Pages 227~232
Carbon dioxide is considered a major greenhouse gas that contributes to global wanning.
is a major component of the exhaust in the combustion of any hydrocarbon fuel. The regulation for
emission from vehicles has become much more stringent in recent years. These more stringent regulations require vehicle manufacturers to develop alternative fuels that reduce exhaust emissions. This paper evaluated the correlation of
emission and fuel economy in the Gasoline, Diesel, and LPG vehicles according to FTP-75 and NEDC(ECE15+EUDC) driving mode. From this study, we discovered that the decrease rate of
emission is higher for fuels of lower carbon concentration. When the relationship between
emission and fuel consumption rate according to used fuels is expressed as a function, one can find out that they have a high correlation. LPG vehicles produce less
emission than gasoline and diesel vehicles.
Solution of the SAAF Neutron Transport Equation with the Diffusion Synthetic Acceleration
Noh, Tae-Wan ; Kim, Sung-Jin ;
Journal of Energy Engineering, volume 17, issue 4, 2008, Pages 233~240
Conventionally, the second-order self-adjoint neutron transport equations have been studied using the even parity and the odd parity equations. Recently, however, the SAAF(self-adjoint angular flux) form of neutron transport equation has been introduced as a new option for the second-order self-adjoint equations. In this paper we validated the SAAF equation mathematically and clarified how it relates with the existing even and odd parity equations. We also developed a second-order SAAF differencing formula including DSA(diffusion synthetic acceleration) from the first-order difference equations. Numerical result is attached to show that the proposed methods increases accuracy with effective computational effort.
Study on Absorption Characteristics of
in Aqueous Alkanolamine Solutions
Oh, Sang-Kyo ; Rhee, Young-Woo ; Nam, Sung-Chan ; Yoon, Yeo-Il ; Kim, Young-Eun ;
Journal of Energy Engineering, volume 17, issue 4, 2008, Pages 241~246
by using fossil fuels makes mainly global warming and the international efforts to reduce the
emission is being promoted. Absorption process using aqueous alkanolamine solution to remove acid components in the mixed gases has been used commercially. This method was used to remove
in the flue gas in recent years.
Absorption characteristics of several aqueous alkanolamine solutions such as MEA, DEA and AMP was studied by measuring vapor-liquid-equilibrium(VLE) and absorption velocity in this study. VLE measuring equipment, shell and reactor type, was used to acquire VLE data, equilibrium
) and time at each pulse gas input. We also acquired the
absorption velocity by measuring the time to arrive the VLE at
and first gas input. The
absorption capacity of MEA 10wt% solution was higher than two alkanolamine solutions at
and the equilibrium
loading was 0.5. Absorption capacity was excellent as follows; AMP>DEA>MEA. But absorption velocity was fast as follows; MEA>AMP>DEA. Though good absorbent was considered by many variables, absorption velocity and capacity was more important factor.