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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
Technical Trend of Spot Cooler
Ha, Soo-Jung ; Kim, Young-Min ; Go, Gang-Yong ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 5~10
DOI : 10.9726/kspse.2014.18.4.005
Smokeless Starting for 4 Cycle Medium Speed Diesel Engine
Jung, Suk-Ho ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 11~16
DOI : 10.9726/kspse.2014.18.4.011
Although smoke emitted from ships is not included in IMO(International Maritime Organiztion) regulation yet, it is one of the substance what is polluting mainly the air. Especially, its concentration is very high when an engine is started and a load is rapidly changed. This is caused by unburned fuel what is injected more than necessary quantity after combustion period. It is possible to decrease smoke concentration emitted at starting engine by controlling fuel injection quantity, but it is concerned that time to rated speed must be spent. Then a governor what can reduce the smoke concentration without a loss of time to rated speed is needed. We adopted a electro-hydraulic governor what can control dual fuel start limit function and achieved very low level of smoke concentration without greater the loss of time to rated speed.
Performance Characteristics of Refrigeration System Using R744 as a Secondary Refrigerant
Yi, Wen-Bin ; Jo, Hwan ; Yoon, Jung-In ; Choi, In-Soo ; Son, Chang-Hyo ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 17~22
DOI : 10.9726/kspse.2014.18.4.017
In this paper, the performance characteristics of R404 indirect refrigeration system using R744 as a secondary refrigerant were investigated experimentally to obtain a optimum design data for this system. First, for the constant experimental conditions, the COP of R404A indirect refrigeration system using R744 as secondary refrigerants decreases with respect to the increases in R404A condensation temperature and temperature difference in R744 cooler. And, the COP of indirect refrigeration system using R744 as secondary refrigerants decreases slightly with decreasing the mass flowrate of R744.
Development of High Performance Bubble Jet Loop Heat Pipe for Hot Water Floor Heating System
Kim, Jong-Soo ; Kwon, Yong-Ha ; Kim, Jeong-Woong ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 23~28
DOI : 10.9726/kspse.2014.18.4.023
In order to increase the performance of conventional hot water floor heating system, the bubble jet loop heat pipe for the system was developed. This experiment was conducted under next conditions : Working fluid was R-134a, charging ratio was 50%. A temperature of hot water, room temperature and flow rate were
and 0.5~1.5 kg/min, respectively. The experimental results, show that bubble jet loop heat pipe had a high effective thermal conductivity of
and a sufficient heat flux of
to heat the floor to
in case of the 1.5 kg/min of flow rate. So the bubble jet loop heat pipe has a possibility for appling of the floor heating system. Additionally, the visualization of bubble jet loop heat pipe was performed to understand the operating principle. Bubbles made by the narrow gap between inner tube and outer tube of evaporating part generate pulsation at liquid surface of working fluid. The pulsation had slug flow and wavy flow. So working fluid circulates in the bubble jet loop heat pipe as two phase flow pattern. And large amount of heat is transferred by the latent heat from evaporating part to condensing part.
Numerical Study for the Optimal Design of Plate Heat Exchanger Using at Seawater Air Conditioning
Kim, Hyeon-Ju ; Jung, Young-Kwon ; Lee, Ho-Saeng ; Yoon, Jung-In ; Son, Chang-Hyo ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 29~35
DOI : 10.9726/kspse.2014.18.4.029
Plate heat exchanger are being applied in the field of OTEC (ocean thermal energy conversion) and SWAC (seawater air conditioning) system. This study is to analyze numerically the heat transfer and pressure drop characteristics by using solid works flow simulation in order to offer optimum design data of plate heat exchanger. Plater heat exchanger proposed in this study is four types. The geometric design parameters of plate heat exchanger are a channel space, a flow orientation, a plate array, the flowrate of working fluid and so on. The main results for numerical analysis of plate heat exchangers are summarized as follows. Heat transfer performance for the channel space of 2.4 mm shows the highest value compared to other spaces. And, the Type 4 plate heat exchanger in Table 2 is the highest performance. From the pressure drop characteristics of plate heat exchanger, the channel space of 3.2 mm shows the lowest value. And Type 1 plate heat exchanger in Table 2 is the lowest pressure drop.
Performance Analysis of R-1270(Propylene) Refrigeration System Using Internal Heat Exchanger
Ku, Hak-Keun ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 36~42
DOI : 10.9726/kspse.2014.18.4.036
This paper considers the influence of internal heat exchangers on the efficiency of a refrigerating system using R-1270. These internal heat exchangers(liquid-gas or suction-line heat exchangers) can, in some cases, yield improved system performance while in other cases they degrade system performance. A steady state mathematical model is used to analysis the performance characteristics of refrigeration system with internal heat exchanger. The influence of operating conditions, such as the mass flowrate of R-1270, inner diameter tube and length of internal heat exchanger, to optimal dimensions of the heat exchanger is also analyzed. The main results were summarized as follows : the mass flowrate of R-1270, inner diameter tube and length of internal heat exchanger, and effectiveness have the influences on the cooling capacity, compressor work and RCI(Relative Capacity Index) of this system. With a thorough grasp of it is possible to design the R-1270 compression refrigeration cycle using internal heat exchanger.
Study on Temperature and Vibration of BLDC Motor
Ye, Jung-Woo ; Son, Mun-Gyu ; Choe, Myoung-Hwan ; Kim, Dae-Hwa ; Cho, Yeon-Su ; Lee, Hyun-Seok ; Shim, Jae-Sool ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 43~51
DOI : 10.9726/kspse.2014.18.4.043
In this paper, transient temperature and vibration characteristics of a brushless DC (BLD(c) motor are studied for external load (165W~495W) and rotational speed (2000 rpm~4000 rpm). For experiment, a simple measurement system is developed to allow a change in load and speed for measuring transient temperature and vibration simultaneously. Temperature and vibration were also measured under the conditions of natural convection and forced convection. Vibrations in the directions of x-axis (#Ch1), y -axis (#Ch2) and z -axis (#Ch3) were obtained by three accelerometers and temperature was obtained by a thermo-couple with respect to time until the motor is steady. Experimental results show that the amplitude of vibration is higher in the order of z-axis (#Ch3), x -axis (#Ch1) and y-axis (#Ch2) and the amplitude of vibration at the forced convection conditions is 10.6% to 17.8% lower than that of vibration at the natural convection. However, the ratio of the vibration value is similar on average regardless of external convection condition.
Emission and heat recovery characteristics of heat recovery and combustor-type CO
generator for greenhouses
Choi, Byungchul ; Lee, Jung-Hyun ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 52~59
DOI : 10.9726/kspse.2014.18.4.052
The purpose of this study is to evaluate the performance of after-treatment equipment and thermal storage devices for a heat recovery and combustor-type
generator fuelled a kerosene. To reduce the levels of harmful exhaust gases produced by a
generator, a catalyzed particulate filter(CPF) has been selected as an after-treatment device, by considering back pressure and exhaust gas temperature. The CO conversions of the catalyzed SiC filter(full plugging) were 92%, and the concentration of PM(particulate matter) was near ambient. A thermal recovery device was used to recover 13% of the heat energy from the exhaust gas through heat exchangers installed on the exhaust line of the
generator. 69% of the moisture within the exhaust gases was removed by condensing water, in order to minimize excessive humidity within the greenhouse.
Performance Characteristics of R134a Supercritical Heat Pump
Choi, In-Soo ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 60~65
DOI : 10.9726/kspse.2014.18.4.060
In this paper, cycle performance analysis for heating capacity, compression work and COP of R134a supercritical heat pump is presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include superheating degree, pressure and outlet temperature of gas cooler, compressor efficiency and evaporating temperature in the R134a supercritical heat pump system. The main results were summarized as follows : Superheating degree, pressure and outlet temperature of gas cooler, compressor efficiency and evaporating temperature of R134a heat pump system have an effect on the heating capacity, compression work and COP of this system. With a thorough grasp of these effect, it is necessary to design the supercritical heat pump using R134a. The prediction for COP of R134a supercritical heat pump have been proposed through multiple regression analysis.
Effect of Heat Treatment on the Microstructure and Damping Capacity of Hot Rolled Magnesium Alloys
Lee, Gyu-Hyun ; Kim, Kwon-Hoo ; Kang, Chang-Yong ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 66~71
DOI : 10.9726/kspse.2014.18.4.066
In this study, effect of heat treatment on the microstructure and damping capacity of hot rolled magnesium alloys was investigated. The microstructure of hot rolled magnesium consisted of dendrite structure and
compounds precipitated along the grain boundry. The dendrite structure was dissipated and
compounds was decomposed by annealing treatment, and then they dissolved in
. With an increasing the annealing temperature and time, damping capacity was slowly increased by the growth of grain size and decreasing of defects induced by hot rolling. Two kinds of magnesium alloys AZ 31 and AZ 61 after annealing showed no difference in damping capacity.
Anti-Corrosion Characteristics of WC-based Alloy Coatings Fabricated by HVOF Process - Polarization Characteristics in Acid Solution -
Kim, Tae-Yong ; Kim, Yeong-Sik ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 72~77
DOI : 10.9726/kspse.2014.18.4.072
The aim of this study to investigate polarization characteristics of WC-based alloy coatings fabricated by high velocity oxygen fuel(HVOF) process. The coatings were fabricated by HVOF process with WC-CrC-Ni, WC-Co-Cr, WC-Co composite powders. Corrosion tests were carried out using potentiostat/galvanostat at solution with pH 2 and pH 6. Corrosion potential(Ecorr) and corrosion current density(Icorr) could be analyzed from polarization curve. WC-Co-Cr coating showed more incorrodible characteristics than other coatings at solution pH 2. WC-CrC-Ni coating was more favorable anti-corrosion characteristics than other coatings at solution with pH 6.
An Estimation of Deformation for Composites by DIC
Kwon, Oh-Heon ; Kang, Ji-Woong ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 78~84
DOI : 10.9726/kspse.2014.18.4.078
The estimation of deformation and strain for the twill-weave carbon fiber reinforced plastic composite(CFRP) during the test with a digital image correlation system were implemented experimentally. The carbon fiber reinforced plastic composites have been developed as the edge technology materials. The plain, twill and satin weave types are commonly used for the CFRP composites. Thus, it is essential to find the deformation characteristics for those types of CFRP more easily. Especially the DIC method can express the visual strain distributions at the full range of the interested areas in the structures. In this study, the mechanical properties of twill-weave CFRP composite and the variation of strains in a full field of the specimen were estimated. The experiments were performed under a tensile loading and 3-point bending test with strain gages. Futhermore the DIC deformation results were estimated for the comparison. The results showed the deformation and strain contours visually well in all region of the interested areas and so usefulness for the safety control of the structures.
Welding Residual Stress and Strength of Thick 9% Nickel Steel Plate
Kim, Young-Kyun ; Kim, Young-Wann ; Kim, Jae-Hoon ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 85~90
DOI : 10.9726/kspse.2014.18.4.085
In this paper, the transient thermal and residual stress analysis of the welding of 9% Ni steel plates using the FEA software ABAQUS are presented. The 9% Ni steel plates are welded manually with welding consumables of 70% Ni based Inconel type super-alloys (YAWATA WELD B (M)), producing a multi-pass/multi-layer butt weld. For these materials, temperature dependant mechanical and thermal material properties are used in the analysis. The back gouging is considered in welding process simulation. The FE thermal results are validated by comparing the real fusion profile and heat affected zone (HAZ). In addition, the continuous indentation test was conducted to measure the strength of base metal, HAZ and weld metal.
Integrated SolidWorks & Simscape Platform for the Model-Based Control Algorithms of Robot Manipulators
Ahn, Doo-Sung ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 91~96
DOI : 10.9726/kspse.2014.18.4.091
The application of the recent model-based control schemes for robot manipulators require the solution of problems concerning various aspects, from the mechanical design to the necessity of determining a robot model suitable for control, and of experimentally testing the control performances. For one solution, integration of SolidWorks with Simscape for designing and controlling robot manipulators is presented in this paper. The integration provides a platform for rapid control prototyping of robot manipulators without the need for building real prototypes. Mechanical drawings of a robot are first created using Solidworks and imported into the Simscape, where a robot is represented by connected block diagrams based on the principle of physical modeling. Simulation examples for 7-DOF SAM ARM made by Berrett Technology Inc. are testified to show effectiveness of the presented platform.
A Study on Motion Recognition and Regeneration Method
Dang, Dac-Chi ; Kang, Chang-Nam ; Kim, Young-Bok ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 97~103
DOI : 10.9726/kspse.2014.18.4.097
In this paper, the authors consider a robot motion control to cope with painting, welding jobs and etc. Especially, a method for easy recognition and regeneration of the robot motions made by the operator is proposed. The method is based on the process of accurate modelling, controller design and experimental evaluation. In this study, the model and controller for all motions are obtained individually, where the control system is designed on the robust control framework. And the experiment result with good control performance is presented.
Evaluation of Low Temperature Properties in EH36 Thick Steel Plate Welded Material by Instrumented Indentation Equipment
Kim, Gwi-Nam ; Lee, Jong-Seok ; Hyeon, Jang-Hwan ; Jung, Yong-Gil ; Huh, Sun-Chul ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 104~111
DOI : 10.9726/kspse.2014.18.4.104
In this study, EH36 is thick steel plate, which welded by auto
gas welding machine, has been applied on offshore filed. The specimen was examined by indentation tester and it was measured for fracture toughness at
by low temperature chamber, respectively. The absorbed energy was got on same temperature by Charpy impact tester. The weld surface was observed for watch of changed crystalline structure by optical microscope, and fracture surface of impact test specimen were observed by scanning electron microscope(SEM).
Development of an Anti-Seasickness Bed used in Vessel
Kim, Young-Bok ; Jeong, Ji-Hyun ;
Journal of the Korea Society For Power System Engineering, volume 18, issue 4, 2014, Pages 112~116
DOI : 10.9726/kspse.2014.18.4.112
Roll and pitching motions of a vessel can seriously degrade the performance of mechanical systems and the effectiveness of personnel. Many studies on roll stabilization and trimming control system design have focused on stabilizing the vessel through the use of fins, tanks, rudders and flaps. However the ultimate objective of such approaches must be to improve boarding sensitivity. This paper presents an anti-seasickness bed that consists of a rotator and bearing system that does not make use of electric power. The advantages of this system are its simple construction, usefulness, and safe operation. In this study, the rotation angles of the upper plate of a bed according to change weight of the rotator have been calculated to determine the stability. As a result, it can be concluded that proposed stabilizing bed can be of practical use in the field.