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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 14, Issue 4 - Dec 2005
Volume 14, Issue 3 - Sep 2005
Volume 14, Issue 2 - Jun 2005
Volume 14, Issue 1 - Feb 2005
Selecting the target year
Effects of Humidity and Velocity on Frost Distribution Characteristics of Humid Air Flow on Cold Surfaces
Kwon Jeong-Tae ; Rew Keun-Ho ; Lim Hyo-Jae ; Han Ji-Won ; Kwon Young Chul ;
Journal of Energy Engineering, volume 14, issue 4, 2005, Pages 213~218
In order to understand the heat and mass transfer characteristics of humid airflow in frosting conditions, a flat plate of aluminum with cooling modules located in the central part of the plate was used. A microscope system (resolution of 0.05 mm) was used for the measurement of local thickness of frost at seven points along the plate in the flow direction. For the total mass of frost at each test operation, an electronic balance (resolution of 1 mg) was used. The local frost thickness distributions far various test conditions were presented along with the frost mass data measured at the given operating times. The effect of humidity and velocity of humid air on frosting were analyzed.
Absorption Properties of
in Aqueous Solutions of Piperazine, Piperidine, Cyclohexylamine
Song Ho-Jun ; Lee Seoungmoon ; Song Hocheol ; Ahn Se-Woong ; Park Jin-won ;
Journal of Energy Engineering, volume 14, issue 4, 2005, Pages 219~225
for the removal of carbon dioxide in flue gas, which is the main cause of the global warming, chemical absorption methods were widely used for years. Alkanolamines such as MEA, AMP, MDEA are mainly used as an absorbent. In this study, cyclic amines - Piperazine, Piperidine and Cyclohelylamine are investigated to compare the chemical solubilities, absorption capacities and rate ot reaction. In conclusion, Piperazine is the most effective absorbent of
and ran be the excellent alternative to the former absorbents. Experiments were performed at 5, 10, 15 weight percent, 30, 40,
, and the gas solubilities are determined by back-titration method, and using Gas Chromatography the absorption rate was compared.
Basic Performance Characteristics of HCCI (Homogeneous Charge Compression Ignition) Engine
Choi Gyeung Ho ; Chung Yon Jong ; Kim Ji Moon ; Dibbler Robert W. ; Han Sung Bin ;
Journal of Energy Engineering, volume 14, issue 4, 2005, Pages 226~231
Essentially combination of spark ignition and compression ignition engines, the HCCI engine exhibits low NOx and Particulate Matter (PM) emissions as well as high efficiency under part load. This paper is concerned with the Homogeneous Charge Compression Ignition (HCCI) engine as a new concept in engines and a power source for future automotive applications. In this research, a 4 cylinder diesel engine was converted into a HCCI engine, and propane was used as the fuel. The purpose of this research is to show the effects of fuel flow rate and the temperature of the intake manifold on the performance and exhaust of an HCCI engine.
MARS Code Applicability Assessments for the HTGR RCCS
Kang Doo-Hyuk ; Kim Hyung-Seok ; Chung Bum-Jin ;
Journal of Energy Engineering, volume 14, issue 4, 2005, Pages 232~240
In this study, the IAEA Benchmark problems far HTR-10 and HTTR RCCS were assessed in order to assess the applicability of MARS code, a thermal-hydraulic safety analysis code developed for water reactors. The calculated results were compared with those or THERMIX, THANPACST2 code, and available experimental data. The calculated results showed generally good agreements with those obtained by the THERMIX code and THANPACST2 code. Deviations were analyzed to be originated from the simplification of complicated geometry and from the modeling capability of heat transfer characteristics in the HTGR components such as water cooler and air tooler. Especially, it was found that the radiation heat transfer in the reactor cavity played an important role in the after heat removal in the RCCS. Thus, it is concluded that MARS code can be successfully applied to the calculation of the RCCS cooling capability of the HTGR in this study.
Application with Winglet-Type Vortex Generators in an In-line Tube Arrangement
Kwak, Kyung-Min ;
Journal of Energy Engineering, volume 14, issue 4, 2005, Pages 241~247
Heat transfer enhancement and pressure loss penalty caused by three-row winglets built in three-row tube-bundles in an in-line arrangement, are compared between 'common flow up' and 'common flow down' winglet configurations. The 'common flow down' winglet-pairs recommended by the previous researchers bring about
increase in heat transfer enhancement and
increase in pressure loss penalty, in comparison with fin-tube bundles without winglets. For the 'common flow up' winglet-pairs, the spanwise distance between the trailing edges (
) of winglet pairs was changed and investigated. Two types ot winglet are applied for triangular and rectangular shapes. In the triangular winglets with
=5 mm in in-line tube bundles, the heat transfer increased up to
, and simultaneously the pressure loss decreased by
for the Reynolds number (based on two times channel height) ranging from 300 to 2700, when the 'common flow up' winglets were built in. The performance of fin-tube bundles with triangular winglets is much superior to the rectangular one, because of the smaller pressure-loss penalty.
Study on Heat Recovery System using Waste Biomass
Lee Chung-Gu ; Lee Se-Kyoun ; Lee Kye-Bock ; Rhi Seok-ho ; Ryou In-Seon ;
Journal of Energy Engineering, volume 14, issue 4, 2005, Pages 248~258
In the present study, in order to estimate possibility as a waste heat recovery system, three different heat exchangers are developed. The developed heat exchangers are tile system to supply the hot water using fermentation of waste biomass. For the experiments, various biomass materials were examined to obtain the best heat recovery. Waste heat recovery system was studied numerically and experimentally. Heat exchanger system was designed specially to obtain the optimum heat exchanging performance. The biomass heat exchanger was operated for 20 minutes, after 1 hour from start-up, the temperature of the biomass dump has been raised to the possible operation temperature. From the three time operations per day, the system would be able to supply the amount of energy, about 62,400 kcal/day.
A Study on Measurement of Premixed Spray Flame using Cross-correlation PIV
Yang Young-Joon ; Kim Bong-Hwan ;
Journal of Energy Engineering, volume 14, issue 4, 2005, Pages 259~267
In an attempt to elucidate combustion mechanism or premixed spray flame in detail, both the enlarged photographing, which was performed for spray cross-sectional images of premixed spray flame, and the cross-correlation PIV, which was performed for consecutive time-series images to obtain instantaneous two dimensional flow field, were applied. This study indicated that CW laser as well as pulse laser could be applied for PIV. Furthermore, the results of cross-correlation PIV, which was self-made PIV program, was shown in good agreement with those of PDA. Therefore, it was verified that cross-correlation PIV using CW laser in this study could be effectively used for observing structure of premixed spray flame.
The Experimental Studies of Vacuum Residue Combustion in a Small Scale Reactor
Park Ho Young ; Kim Young Ju ; Kim Tae Hyung ; Seo Sang Il ;
Journal of Energy Engineering, volume 14, issue 4, 2005, Pages 268~276
Vacuum Residue (VR) combustion tests were carried out with a 20 kg/hr (fuel feed rate) small scale reactor. The nozzle used was a steam atomized, internal mixing type. Compared to heavy oil, vacuum residue used in this work is extremely high viscous and contains high percentages of sulfur, carbon residue and heavy metals. To ignite atomized VR particles, it was necessary to preheat the reactor, and it has been done with LP gas. The axial and radial gas temperature, major species concentrations and solid sample were analyzed when varying the fuel feed rate. The main reaction zone of atomized VR-air flame in a reactor was anticipated within about 1 m from the burner tip by considering the profiles oi gas temperature, species concentration and particle size measured along with the reactor. At downstream, the thermally, fully developed temperature distribution was obtained. SEM photographs revealed that VR carbon particles collected from the reactor are porous and have many blow-holes on the particle surface.