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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
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Journal DOI :
The Korea Society for Power System Engineering
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Volume & Issues
Volume 19, Issue 6 - Dec 2015
Volume 19, Issue 5 - Oct 2015
Volume 19, Issue 4 - Aug 2015
Volume 19, Issue 3 - Jun 2015
Volume 19, Issue 2 - Apr 2015
Volume 19, Issue 1 - Feb 2015
Selecting the target year
Dust collector strainer and carbon filter pressure permeation analysis
Lee, Chi-Woo ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 5~10
DOI : 10.9726/kspse.2015.19.4.005
Dust collector is one of the most widely used equipment among the method of separating particles, it filters exhaust gas having various kinds of dusts through several filters installed on parallel. This research investigated the moving characteristic of Honeycomb-type carbon filter in pressure drop of smoking collector's ventilation system. It also compared pressure transmission coefficient through pressure drop according to flow velocity change.
Friction Stir Welding Characteristics of Al5052 Aluminium Alloy by Design of Experiment
Kang, Dae-Min ; Jang, Jin-Suk ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 11~16
DOI : 10.9726/kspse.2015.19.4.011
Welding is very popular method for joining two or more metals. In this paper, the three-way factorial design was adopted for obtaining the optimum friction stir welding conditions of Al 5052 alloy. Tools of shoulder diameter of 9, 12, 15 mm and pin length of 1.5 mm were used. Also the material's dimension for welding was
, and the tensile specimens were worked by water-jet technique. Welding variables were shoulder diameter, rotating speed of tool and welding speed. As far as this work is concerned, optimum condition for friction stir joint of Al 5052 alloy was predicted as the shoulder diameter of 15 mm, welding speed of 500mm/min and rotating speed of 1000 rpm. In addition, the presumed range of tensile strength under the optimal conditions is estimated to be
MPa with 99% reliability.
The FSI Analysis Evaluation of Strength for the Wind Turbine Rotor Blade Improved by the Aramid Fiber
Kim, Seok-Su ; Kang, Ji-Woong ; Kwon, Oh-Heon ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 17~23
DOI : 10.9726/kspse.2015.19.4.017
Because of the energy resources shortage and global pollution, the wind power systems have been developed consistently. Among the components of the wind power system, the rotor blades are the most important component. Generally it is made of GFRP material. Recently, GFRP material has been replaced by CFRP composite material in the blade which has an aerodynamic profile and twisted tip. However the failures has occurred in the trailing edge of the blade by the severe wind loading. Thus, tougher material than CFRP material is needed as like the aramid fiber. In this study, we investigated the mechanical behaviors of the blade using aramid fiber composites about wind speed variation. One-way FSI (fluid-structure interaction)analysis for the wind rotor blade was conducted. The structural analyses using the surface pressure loading resulted from wind flow field analysis were carried out. The results and analysis procedure in this paper can be utilized for the best strength design of the blade with aramid fiber composites.
Looper-Tension Control of Strip Top-Tail Parts for Hot Rolling Mills
Hwang, I-Cheol ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 24~29
DOI : 10.9726/kspse.2015.19.4.024
This paper designs a looper-tension controller for strip top-tail parts in hot strip finishing mills. A three-degree linear model of the looper-tension system is derived by a Taylor's linearization method, where the actuator's dynamics are ignored because of their fast responses. A feedforward shaping controller for the strip top part and a feedforward model reference controller for the strip tail part are respectively designed, they are combined with an ILQ(Inverse Linear Quadratic optimal control) feedback controller for the strip middle part. It is shown from by a computer simulation that the proposed controller is very effective to the strip top-tail parts including the middle part.
Low Temperature Performance and Compressive Strength Characteristics of an Extruded Homogeneous SCR
Seo, Choong-Kil ; Oh, Kwang-Chul ; Kim, Shin-Han ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 30~35
DOI : 10.9726/kspse.2015.19.4.030
The purpose of this study is to identify the low temperature performance and strength characteristics of V-based extruded homogeneous SCR. The extruded catalyst and the coated catalyst showed 50% and 27% of NOx conversion performance respectively at about
of catalyst temperature, so the extruded SCR was higher in de-NOx performance than the coated SCR especially at a low temperature zone. The compressive strength of the Enhanced Extrusion #1, in which the content of promoters such as silica, clay, glass fiber and binder was optimized, was a 120% improvement compared to the Extrusion#1 catalyst, higher than the coated SCR.
Three-Dimensional Numerical Study on the Vortex Flow in a Horizontal Channels with High Viscous Fluid(2)
Piao, Ri-Long ; Kim, Jeong-Soo ; Bae, Dae-Seok ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 36~42
DOI : 10.9726/kspse.2015.19.4.036
TMixed convective flow in a bottom heated and top cooled rectangular channel can be significantly affected by the channel aspect ratio, Prandtl number, Reynolds number, Rayleigh number and angle of inclination. In such a mixed convection, the flow pattern plays an important role in various technological processes. In this study, a numerical investigation is carried out to explore mixed convection in a three-dimensional rectangular channel with bottom heated and top cooled uniformly. The three-dimensional governing equations are discretized using the finite volume method. In the range of low Reynolds number(
), the effects of the aspect ratio(
) and Gr/Re are presented and discussed. The longitudinal roll number in the channel is increased with increasing aspect ratio, and the roll number induced, regardless of the aspect ratio number, is even in the range of aspect ratios between 2 and 12, New vortex flow structure containing inclined longitudinal rolls is found, which is affected by aspect ratio and Reynolds number. The ratio Gr/Re is used to check the relative magnitudes of forced and natural convection in the mixed convective flow of high viscous fluid.
Experimental Study on the Development of Food Drying Machine for Home Use Using Low Electricity
Kim, Soon-Ho ; Kim, Ki-Wan ; Kim, Hoon ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 43~49
DOI : 10.9726/kspse.2015.19.4.043
This study has been analyzed and investigated the possibility for the substitution of a heat source with the application of PTC(Positive Temperature Coefficient Heater) in a food drying machine. And this experiment was conducted to measure temperatures at the upper part of the vessel and the heat sink. And the structure has the many holes plane connected with the external air in the upper part of similar volumetric vessel, and attached to the PTC heater (3sets) of total consumption electricity of 120[W] in Al radiant heat structure and the small fan (2sets) in the suitable space of the lower part. Consequently, it was found that at the most conditions of food drying test with the seven holes(5mm) under the control temperature
, the optimum drying condition formatted and the optimum time range especially appeared from 6,500 second to 7,000 second in case of drying test on banana sample.
A Study on Application of the Free Cooling System with Dry Cooler Using Economic Evaluation
Yoon, Jung-In ; Son, Chang-Hyo ; Kim, Hee-Min ; Kim, Young-Min ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 50~55
DOI : 10.9726/kspse.2015.19.4.050
Recently, because of the deterioration of the nuclear generating station and increase of the cooler and heater, energy problem is increasing. To save the energy, the free cooling system is developed. The free cooling system is that cool the water to use cooled air in winter and is used in industrial process or data center. Yoon check the energy of free cooling system with dry cooler in korea. In this study, the value of the free cooling system with dry cooler is confirmed through using the NPV that is economic evaluation. when temperature degree of the cooled water is 10, in Chuncheon and Seoul the value is the most high. When temperature degree of the cooled water is 20, in Ulsan the value is the most high. As the result, because the using the temperature degree of the cooled water is high in the industrial process, the free cooling system is advantageous in korea.
A Study on Characteristics of Spray and Combustion of LPG and CNG about the Effect of Impingement-wall under Direct Injection Condition
Chung, Sung-Sik ; Hwang, Seong-Ill ; Yeom, Jeong-Kuk ; Kim, Sung-Hee ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 56~68
DOI : 10.9726/kspse.2015.19.4.056
Liquefied petroleum gas and compressed natural gas haven been regarded as promising alternative fuels because of no smoke, and they are also clean fuel for spark-ignited engine. In spark-ignited direct-injection engine, direct injection technology can increase engine volumetric efficiency significantly and also reduce necessity of throttle valve. This study designed combustion chamber equipped with visualization system. To improve ignition probability, the study designed to help three types of impingement-walls to form mixture. In doing so, LPG CNG-air mixture could be easily formed after spray-wall impingement and ignition probability increased too. The results of this study could contribute as basic resources of spark-ignited direct injection LPG and CNG engine design and optimization extensively.
A Study on the Characteristics of Heating Performance of High-Performance Heat Pump with VI cycle using Re-Heater
Lee, Jin-Kook ; Choi, Kwang-Hwan ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 69~75
DOI : 10.9726/kspse.2015.19.4.069
In this study, the characteristics of heating performance of a high-performance air-cooled heat pump with vapor-injection(VI) cycle using re-heater was investigated experimentally. Devices used in the experiment is consist of a VI compressor, condenser, oil separator, refrigerant (economizer outlet refrigerant) re-heater, economizer, evaporator. And R410A was used as a working fluid. The experiment was conducted with two cycles(cycles A and B) for investigating heating performance. In case of cycle B, heat exchange was conducted by re-heater between outlet refrigerant of compressor and suction refrigerant of the VI system(Fig.1, re-heater). But the re-heater was not used in case of cycle A. As a result of this experiment, discharge temperature of refrigerator in compressor was shown higher value, when the cycle B was conducted, because of the heat exchange between suction refrigerant of VI cycle and outlet refrigerant of compressor in the re-heater than cycle A that was not use re-heater. it means that liquid hammer and the decrement of heating performance can be decreased by using re-heater. Also, Heating coefficient of performance(COPh) was shown about 2.98 in Cycle B which was 4% higher than Cycle A and from these results, It was confirmed that the improvement of the heating performance of heat pump with VI cycle can be achieved by applying re-heater.
A Classification on the Causes of Wind Turbine Accidents
Kim, Gui-Shik ; Jeong, Ji-Hyun ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 76~81
DOI : 10.9726/kspse.2015.19.4.076
The production of electricity from wind energy is noticed as economic power generation system in the natural resource. Lately, since lots of wind turbine have installed globally, the accidents have increased gradually. In this paper, we classified domestic information for 10 years, information of new energy and industrial technology development organization(NEDO) for 4years and caithness windfarms information forum(CWIF) for 15 years according to part and cause of wind turbine accident. We found that the main causes of accidents are storm, lightening and carelessness. The results of classifying and analyzing the informations, should be used to take measures on the accident prevention of wind turbine.
Effect of Impinging Plate on Exhaust Emission and Engine Performance in Diesel Engine
Jin, Yong-Su ; Kim, Jae-Dong ; Kim, Yeong-Sik ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 82~88
DOI : 10.9726/kspse.2015.19.4.082
The purpose of this study is to investigate the effect of the impinging plate on combustion process in Diesel engine. Especially, the variation of exhaust emission and engine performance by the change of fuel injection timing and fuel injection pressure between the trial engine with impinging plate and the prototype engine were examined. The nitrogen oxide concentration of the trial engine decreased more than 50% compared to the prototype engine, however, smoke concentration of the trial engine indicated higher degree than the prototype engine. The smoke concentration, fuel consumption rate and exhaust gas temperature decreased as the fuel injection timing become faster, whereas the nitrogen oxide concentration decreased as the fuel injection timing is retarded. The nitrogen oxide concentration, fuel consumption rate and exhaust gas temperature decreased as the fuel injection pressure become lower. But smoke concentration decreased as the fuel injection pressure become higher.
Improvement of Conventional Sliding Mode Observer for Full Range Sensorless Control of a PMSM
Wibowo, Wahyu Kunto ; Jeong, Seok-Kwon ;
Journal of the Korea Society For Power System Engineering, volume 19, issue 4, 2015, Pages 89~96
DOI : 10.9726/kspse.2015.19.4.089
This paper investigates some strategies to overcome the chattering problem of the conventional sliding mode observer (SMO) and to improve the rotor position estimation performance for full range sensorless control of a PMSM. An adaptive observer gain based on the Lyapunov's stability criterion and a cascade low pass filter with advanced phase delay compensation were proposed to reduce the chattering problem and to strengthen the filtering capability of the SMO. Several cases studies through experiments were carried out to confirm conventional SMO's problems and effectiveness of the proposed strategies. The experimental results show that the proposed method gives precise estimation on speed and rotor position when the motor rotates on 2% of its rated speed.