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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Society For Power System Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Power System Engineering
Editor in Chief :
Volume & Issues
Volume 18, Issue 6 - Dec 2014
Volume 18, Issue 5 - Oct 2014
Volume 18, Issue 4 - Aug 2014
Volume 18, Issue 3 - Jun 2014
Volume 18, Issue 2 - Apr 2014
Volume 18, Issue 1 - Feb 2014
Selecting the target year
An Advanced Method for Behavior-Characteristics Analysis of Diesel Fuel Spray
Yeom, Jeong-Kuk ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 5~13
DOI : 10.9726/kspse.2014.18.3.005
In order to control emissions from engine, it is necessary to understand the mixture formation process of diesel spray. In this study, analysis of diesel fuel(n-Tridecane,
) spray under a high temperature and pressure was performed by a general-purpose program, ANSYS CFX release 11.0, and the results of these are compared with experimental results of diesel fuel spray using the Exciplex Fluorescence Method. The simulation results of diesel spray is analyzed by using the combination of Large-Eddy Simulation(LES) and Lagrangian Particle Tracking(LPT), and then injection pressure was selected as an analysis parameter. Consequently, it was found that the experimental results and the numerical results are consistent with each other, and then in order to investigate the behavior characteristics of evaporative diesel spray, the effectiveness of the use of CFX of commercial code is definitely validated.
The Effect of Additive Catalyst according to Thermal Aging of Vanadia SCR
Seo, Choong-Kil ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 14~19
DOI : 10.9726/kspse.2014.18.3.014
The purpose of the study is to investigate the effect of additive catalyst according to the thermal aging of vanadia SCR catalysts. At a fresh condition, the
SCR showed the highest NOx conversion rate of about 30%, the performance of 5 kinds of SCR to which additive catalysts were added was not improved due to the insignificant effect of acid site control. For catalysts aged for 12h at
, the SCR to which 3wt% Zeolite was added decreased in NOx conversion rate by 2.5% on average compared to the fresh SCR, it showed higher thermal durability than other additive catalyst. For 3Zeolite with high performance of NOx conversion rate during thermal aging, the Zeolite with stronger durability at a high temperature than other 5 kinds of SCR catalysts decreased the sintering of catalysts.
Optimum Suspension System Design for a Drum-typed Washing Machine
Cha, Sang-Tae ; Baek, Woon-Kyung ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 20~28
DOI : 10.9726/kspse.2014.18.3.020
Most washing machines are now produced as a drum-type, where a washing drum mounted on a suspension system with springs and dampers, to minimize the transmittance of the vibration from the drum to the cabinet. The purpose of this paper is to develop optimized suspension system of the drum washing machine which minimizes transmission of disturbing vibration and force. In this paper, a method for optimizing suspension system of the drum washing machine is presented using ADAMS. The design variables to optimize are extracted using Sequential Quadratic Programming(SQP) in ADAMS. To evaluate optimized spring constants and damping coefficients of the drum washing machine, simulation was done to compare the vibration attenuation performances before and after the optimization. The results of simulation show that the optimized suspension system has better performance than before the optimization.
Characterization of Chemical Sludge inside Pipes Using Torsional Guided Waves
Park, Kyung-Jo ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 29~35
DOI : 10.9726/kspse.2014.18.3.029
A new method is presented that uses guided wave techniques for sludge and blockage detection in long-range pipelines. Existing techniques have the limitations that the sludge position needs to be known a priori and the area to be inspected needs to be accessible. A novel guided wave technique has been developed that allow the sludge or blockages to be detected remotely without the need to access the specific location where the pipe is blocked, nor to open the pipe. The technique measures the reflection of guided waves by sludge that can be used to accurately locate the blocked region. The effectiveness of the proposed technique is demonstrated and confirmed by experimental measurements.
Motion analysis of a VLCO for wave power generation
Lee, Seung-Chul ; Goo, Ja-Sam ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 36~41
DOI : 10.9726/kspse.2014.18.3.036
The structure of a variable liquid column oscillator(a VLCO) is analogous to that of the tuned liquid column damper used to suppress oscillatory motion in large structures like tall buildings and cargo ships. The VLCO is a system absorbing high kinetic energy of accelerated motions of the multiple floating bodies in the effect of air springs occurred by installation of inner air chambers. Thus, VLCO can improve the efficiency of energy than wave energy converters of the activating object type made in Pelamis Company. In this research, the experiment was performed in two models of same draft. The one is that weights were filled, and the other is that water was filled. The numerical results were estimated by assuming that do not exist internal flow, and the results were compared with the results of experiments.
Collection Characteristics of Wet-type Multi-layered and Multi-staged Porous Plate System
Yoa, Seok-Jun ; Kim, Joo-Yeon ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 42~50
DOI : 10.9726/kspse.2014.18.3.042
The main object of this study is to investigate the collection characteristics of wet-type multi-layered and multi-staged porous plate system experimentally. The experiment is carried out to analyze the characteristics of pressure drop and collection efficiency for the present system with the experimental parameters such as water spray, inlet velocity, stage number and inlet particle concentration, etc. In results, for the present system of wet-type, the pressure drop represents 158
higher 3% than that in dry-type at 5 stage and
=3.53 m/s. In case of 5 stage,
=3.53 m/s and water spray 250 ml/min, the collection efficiency of the present system becomes significantly higher as 99.7% comparing to that of the conventional wet-type scrubber. Additionally, for 5 stage and 250 ml/min,
removal efficiencies decrease with the increment of inlet velocity representing 75.0, 62.5, 50.0%, at
=2.12, 2.82, 3.53 m/s, respectively.
The Application of 3D Injection Molding Simulation in Gate Location Selection for Automotive Console
Choi, Young-Geun ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 51~58
DOI : 10.9726/kspse.2014.18.3.051
Injection molding simulation provided optimized design results by analyzing quality problems while the product is in assembly or in the process of manufacturing with make automobile plastics. Frequent change of design, change of injection molding, repetition of test injection which was held in the old way can now be stopped. And quality upgrade is expected instead. This report deals with the effect which the position of injection molding automobile console gate and number has on product quality including pressure at end of fill, bulk temperature at end of fill, shear stress of end of fill, residual stress at post filling end, product weld lines and warpage results. Simpoe-Mold simulates the complete manufacturing process of plastic injected parts, from filling to warpage. Simpoe-Mold users, whether they are product designers, mold makers or part manufacturers, can identify early into the design stage potential manufacturing problems, study alternative solutions and directly assess the impact of such part modification, whatever the complexity and geometry of such parts, shell part as plain solid parts.
Evaluation of Turbulent Models on the Swirling Flow of a Gun-Type Gas Burner According to the Mesh Size
Kim, Jang-Kweon ; Oh, Seok-Hyung ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 59~65
DOI : 10.9726/kspse.2014.18.3.059
The computational fluid dynamics was carried out to evaluate turbulent models on the swirling flow of a gun-type gas burner(GTGB) according to the mesh size. The commercial SC/Tetra software was used for a steady-state, incompressible and three-dimensional numerical analysis. In consequence, the velocity magnitude from the exit of a GTGB and the flowrate predicted by the turbulent models of MP k-
, Realizable k-
and RNG k-
agree with the results measured by an experiment very well. Moreover, the turbulent kinetic energy predicted by the turbulent model of standard k-
with mesh type C only agrees with the experimental result very well along the radial distance. On the other hand, the detailed prediction of the information of swirling flow field near the exit of a GTGB at least needs a CFD analysis using a fairly large-sized mesh such as a mesh type C.
Effect of Inclined Wall Number on Heat Transfer and Friction in the Smooth Channel
Lee, Myung-Sung ; Ahn, Soo-Whan ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 66~72
DOI : 10.9726/kspse.2014.18.3.066
The local heat transfer and pressure drop of developed turbulent flows in the smooth convergent/divergent channels with rectangular and square cross-sectional areas along the axial distance have been investigated experimentally. The measurement was conducted within the range of Reynolds numbers from 15,000 to 89,000. The channel hydraulic diameter ratios of 0.67 and 1.49 in the rectangular channel with 2 inclined walls and the ratios 0.75 and 1.33 in the square channel with 4 inclined walls are considered. The comparison showed that among the four channels the square divergent channel has the highest thermal performance at the identical mass flow rate, at the identical pumping power, and at the static pressure drop.
Analysis on the Energy Saving Effect of Free Cooling System in Data Center
Yoon, Jung-In ; Son, Chang-Hyo ; Heo, Jeong-Ho ; Kim, Young-Min ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 73~78
DOI : 10.9726/kspse.2014.18.3.073
Recently, Free cooling system usage has increased at many buildings in intermediate and winter season. Free cooling system is used to reduce the energy consumption of refrigeration in that season. Free cooling system is refrigeration system using cooled water. In general, this system is applied with the building having refrigeration load at all time such as a data center. In this study, energy consumption of a data center taking free cooling system in Ulsan was evaluated by the software HYSYS. the main result is as in the following : free cooling system is effective from January to April and from November to December. In case of Ulsna in 2013, using free coolng system is able to spend refrigeration energy of about 15% less than existing system. According to this result, it is appropriated that free cooling system is used in building having refrigeration load at all time such as data center.
Three-Dimensional Numerical Study on the Vortex Flow in a Horizontal Channels with High Viscous Fluid
Piao, Ri-Long ; Kim, Jeong-Soo ; Bae, Dae-Seok ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 79~86
DOI : 10.9726/kspse.2014.18.3.079
Mixed convective vortex flow in the three-dimensional rectangular channel filled with high viscous fluid(Pr=909) is investigated computationally under various operating conditions. The Reynolds number is varied from 0 to
, the Rayleigh number from
. The three-dimensional governing equations are discretized using the finite volume method. The effects of Reynolds number and Rayleigh number are presented and discussed. From a parametric study, it is found that vortex flow pattern of mixed convection in rectangular channels can be classified into three flow patterns basically, but the new vortex flow structures containing wave rolls are found, which are affected by Rayleigh number and Reynolds number. From this results, we can draw a flow regime map to delineate various vortex flow patterns in the high viscosity fluid mixed convective flow.
Study on the Thermal Behavior of Immersion Cooled LED Lighting Engines
Kim, Kyoung Joon ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 87~92
DOI : 10.9726/kspse.2014.18.3.087
This study is aimed at investigating the thermal behavior of immersion-cooled high power LED lighting engines. 3D CFD models have been generated for the numerical analysis. Five cases in terms of the configuration of LED chips have been explored for various passive cooling conditions of the lighting engine, i.e., the natural air convection with a lens, the natural air convection without a lens, the deionized water-immersion cooling condition with a lens. The numerical study reveals that the deionized water-immersion cooled lighting engine has nearly twice better thermal performance than the natural air convection cooled lighting engine containing a lens. The investigation has also demonstrated that the four chips configuration has the better thermal performance than the single chip configuration.
Development of Non-Sintered Ceramic Containing Basalt Powder
Kim, Gui-Shik ; Kim, Jung-Yun ; Jeong, Ji-Hyun ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 93~99
DOI : 10.9726/kspse.2014.18.3.093
The purpose of this paper is to manufacture the non-sintered ceramic used lime and industrial waste. The used materials were basalt powder sludge, calcium hydroxide(Ca(OH)2) and additives such as calcium stearate and
. The mixing ratios between Ca(OH)2 and sludge were 5:5, 6:4 and 8:2, respectively. The ceramic forms were pressured by 100, 200 and 300 bar and cured in 14% CO2 for 12 days. The behaviors of compressive strength, specific gravity, water absorption and pH of ceramic form were investigated. The results were compressive strength of over 36 MPa, water absorption of over 8.8%, pH value of over 12.3. And these results satisfied GR F 4006 and 4031 standard.
Effect of Thermomechanical Treatment on the Mechanical Properties of 316L Stainless Steel
Kang, Chang-Yong ; Kwoon, Min-Gi ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 100~105
DOI : 10.9726/kspse.2014.18.3.100
This study is to investigate the effect of thermo mechanical treatment on the mechanical properties of 316L stainless steel.
-martensite was formed by deformation. With increasing number of thermo mechanical treatment, volume fraction of martensite was increased rapidly, and then unchanged. With increasing number of thermo mechanical treatment, hardness and strength was increased rapidly, and then unchanged while elongation was decreased rapidly, and then unchanged. With increasing volume fraction of martensite formed by thermo mechanical treatment, hardness and strength was increased rapidly, elongation was decreased rapidly. Thus, hardness, strength and elongation of thermo mechanical treated 316L stainless steel was strongly affected by martensite formed by thermo mechanical treatment. Good combination of strength and elongation was obtained from thermomechanical treatment.
TIG Welding Characteristics of Stainless Steel by Design of Experiment
Chung, Joong Gyo ; Park, Kyoung Do ; Kang, Dae Min ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 106~111
DOI : 10.9726/kspse.2014.18.3.106
Welding is very popular method for joining two or more metals. However, welding causes residual stress and distortion and these give a bad influence to the structure strength. In this paper, TIG welding technique was performed to investigate the joint characteristics of AISI321 steel. For its evaluation, the orthogonal array method and variance analysis were applied with three factors of electric current, travel speed and argon gas and also three levels of each factor to tensile tests for optimum design. From the results, the increaser weld speed the narrower bead width and the lower weld penetration. The increaser electric current the brighter argon gas and the wider bead width. Also weld speed influenced most on the tensile strength and presumption range of tensile strength at optimal condition from reliability 95% was estimated to
. In addition the increaser weld speed and electric current the fracture occurred around bead vicinity.
A Study on the Benefit-Cost Analysis of Photovoltaic System in the Greenhome
Jung, Soon-Sung ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 3, 2014, Pages 112~117
DOI : 10.9726/kspse.2014.18.3.112
The purpose of this study is to suggest the benefit-cost analysis for photovoltaic system in greenhome. Perspectives of benefit-cost analysis for photovoltaic system in greenhome is participant, non-participant, administrator and nation. This study identifies the cost and benefit components and benefit-cost calculation procedures from four major perspectives : participant, non-participant, administrator and nation. The results of benefit-cost analysis from each perspective can be expressed in a variety of ways, but in all cases it is necessary to calculate the net present value of photovoltaic system impacts over the lifecycle of those impacts.