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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
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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
An Experimental Study on Frosting of Humid Air-flow on a Surface with Local Cooling for Heat Exchanger Design
Kwon, Jeong-Tae ; Lim, Hyo-Jae ; Park, Kyoung-Woo ; Kim, Chang-Eob ; Kim, Kyung-Min ; Kwon, Young-Chul ;
Journal of Energy Engineering, volume 17, issue 1, 2008, Pages 1~7
The present study has been conducted to understand the heat and mass transfer characteristics of humid airflow in frosting conditions. A flat plate of aluminum was used for the simulation of flat surface part of the fin of the heat exchanger. The aluminum surface temperatures were measured and analyzed to clarify the heat and mass transfer characteristics under frosting conditions. Also, the pressure drops were measured to clarify the air-blocking effect of frost in the mini channel of the air-side hoot exchangers. A data reduction method was developed far the analysis of local characteristics of humid air under frosting conditions.
The Effects of Calcium-type Catalysts on the Pyrolysis Reaction of Raw Material Resin for Producing from Waste Vinyl to Fuel-oil
Bak, Young-Cheol ; Choi, Joo-Hong ; Cho, Tae-Ho ;
Journal of Energy Engineering, volume 17, issue 1, 2008, Pages 8~14
The effects of calcium type catalysts addition on the thermal decomposition of low density polyethylene (LDPE) and ethylene vinyl acetate (EVA) resin have been studied in a thermal analyze. (TGA, DSC) and a small batch reactor. The calcium type catalysts tested were calcinated dolomite, lime, and calcinated oyster shell. As the results of TGA experiments, pyrolysis starting temperature for LDPE varied in the range of
according to heating rate, but EVA resin had the 1st pyrolysis temperature range of
and the 2nd pyrolysis temperature range of
. The calcinated dolomite enhanced the pyrolysis rate in LDPE pyrolysis reaction, while the calcium type catalysts reduced the pyrolysis rate in EVA pyrolysis reaction. In the DSC experiments, addition of calcium type catalysts reduced the melting point, but did not affect to the heat of fusin. Calcinated dolomite reduced 20% of the heat of pyrolysis reaction. In the batch system experiments, the mixing of calcinated dolomite and lime enhanced the yield of fuel oil, but did not affect to the distribution of carbon numbers.
Physical and Chemical Characteristics of Oilsands Bitumen Using Vacuum Distillation
Kim, Kyoung-Hoon ; Jeon, Sang-Goo ; Roh, Nam-Sun ; Kim, Kwang-Ho ; Shin, Dae-Hyun ; Park, Hyo-Nam ; Han, Myung-Wan ;
Journal of Energy Engineering, volume 17, issue 1, 2008, Pages 15~22
This study was carried out to investigate physical and chemical characteristics of the distillates and residue of Athabasca oilsand bitumen obtained from Canada, using a vacuum distillation unit. The distillates and residue produced from the vacuum distillation were characterized through atomic analysis, SARA analysis, and measurement of boiling point distribution, molecular weight, and API gravity. The vacuum distillation equipment consisted of a 6-litter volume vessel, a glass-packed column, a condenser, a reflux device, a flask fer collecting distillates, and a temperature controller. The cutting of distillates was performed with four steps under the condition of full vacuum and maximum temperature of
. The results showed that the sulfur amount and average molecular weight of the distillates were significantly reduced compared to those of oilsand bitumen. As the cutting temperature increased, the hydrogen amount decreased but the sulfur amount and average molecular weight increased in the distillates.
Development and Verification of AMBIKIN2D, A Two Dimensional Kinetics Code for Fluid Fuel Reactors
Lee, Young-Joon ; Oh, See-Kee ;
Journal of Energy Engineering, volume 17, issue 1, 2008, Pages 23~30
The neutron kinetic analysis methods for the molten-salt reactors are quite different from those for conventional solid-fuel reactors, which do not take into account the flowing-fuel-induced neutronics effects. Therefore, for dynamics and safety analyses of the molten-salt reactor systems, the conventional kinetics codes would not be appropriate to accurately predict its transient behaviors. A point-kinetics with flowing- fuel model has been used to assess the fluid-fuel reactor system safety, but recognized as not to be sufficient to simulate spatial distributions of delayed-neutron precursors and neutron populations during transients for given detail reactor models. In order to meet this requirement, AMBIKIND, a 2-group, 2-dimensional neutron kinetics code suitable for the molten-salt reactor systems was developed. This paper explains the code's theoretical and numerical descriptions and, as a part of its verification, includes some simulation results of MSRE stability experiments. Even though the present reactor model does not include the recirculation effect of the fuel-salt through the reactor system, the AMBIKIN2D code should be able to predict the power and phase shift at various power levels and reactivity insertions with better accuracy.
A Study on Forecast of Penetration Amount of High-Efficiency Appliance Using Diffusion Models
Park, Jong-Jin ; So, Chol-Ho ; Kim, Jin-O ;
Journal of Energy Engineering, volume 17, issue 1, 2008, Pages 31~37
At present, the target amount of demand-side management and investment cost of EE (Energy Efficiency) program, which consists of high-efficiency appliances, has been estimated simply by the diffusion function based on the real historical data in the past or last year. In the internal and external condition, the penetration amount of each appliance has been estimated by Bass diffusion model which is expressed by time and three coefficients. And enough acquisition of real historical data is necessary for reasonable estimation of coefficients. In energy efficiency, to estimate the target amount of demand-side management, the penetration amount of each appliance should be primarily forecasted by Bass diffusion model in Korea. On going programs, however, lightings, inverters, vending machine and motors have a insufficient real historical data which is a essential condition to forecast the penetration amount using a Bass diffusion model due to the short period of program progress. In other words, the forecast of penetration amount may not be exact, so that it is necessary for the method of forecast to apply improvement of method. In this paper, the penetration amount of high-efficiency appliances is forecasted by Bass, virtual Bass, Logistic and Lawrence & Lawton diffusion models to analyze the diffusion progress. And also, by statistic standards, each penetration is compared with historical data for model suitability by characteristic of each appliance. Based on the these result, in the forecast of penetration amount by diffusion model, the reason for error occurrence caused by simple application of diffusion model and preferences of each diffusion model far a characteristic of data are analyzed.
Physical and Chemical Characteristics of Solvent-Insolubles and Solvent-Solubles in Oilsands Bitumen
Kim, Kyoung-Hoon ; Jeon, Sang-Goo ; Nho, Nam-Sun ; Kim, Kwang-Ho ; Shin, Dae-Hyun ; Lee, Ki-Bong ; Park, Hyo-Nam ; Han, Myung-Wan ;
Journal of Energy Engineering, volume 17, issue 1, 2008, Pages 38~45
In this work, we investigated the variation of physical and chemical characteristics of solvent-insolubles and solvent-solubles in Canada's Athabasca oil sands by solvent-insolubles experiments. N-Heptane, n-Hexane, and n-Pentane were tested for solvents and asphaltenes were separated from maltenes by using a modified ASTM D 3279 method. Elemental analysis, boiling point distribution (SIMDIS), molecular weight distribution, heavy metal contents, API gravity, viscosity and SARA fractions were measured for thorough samples. The asphaltenes-removed maltenes contained less sulfur and heavy metal amounts and had lower molecular weight than the original bitumen. N-Pentane solvent could lower sulfur and heavy metal amounts, molecular weight, and viscosity of maltenes compared to the other solvents. Eventually, we confirmed that the obtained experimental data could be used as basic informations of bitumen upgrading processes for the production of SCO (synthetic crude oil).