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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Gas
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Journal DOI :
The Korean Institute of GAS
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Volume & Issues
Volume 14, Issue 6 - Dec 2010
Volume 14, Issue 5 - Oct 2010
Volume 14, Issue 4 - Aug 2010
Volume 14, Issue 3 - Apr 2010
Volume 14, Issue 2 - Apr 2010
Volume 14, Issue 1 - Feb 2010
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Performance Analysis of an Ammonia(R717) and Carbon Dioxide(R744) Two-Stage Cascade Refrigeration System
Son, Chang-Hyo ;
Journal of the Korean Institute of Gas, volume 14, issue 1, 2010, Pages 1~7
In this paper, cycle performance analysis of
(R717-R744) two-stage cascade refrigeration system is presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include subcooling and superheating degree, compressor efficiency, and condensing and evaporating temperature in the ammonia(R717) high temperature cycle and the carbon dioxide low temperature cycle. The main results were summarized as follows : The COP of two-stage cascade refrigeration system increases with the increasing subcooling degree, but decreases with the increasing superheating degree. The COP of two-stage cascade refrigeration system decreases with the increasing condensing temperature, but increases with the increasing evaporating temperature. And the COP of two-stage cascade refrigeration system increases with increasing the compressor efficiency. Therefore, superheating and subcoolng degree, compressor efficiency, and evaporating and condensing temperature of
(R717-R744) two-stage cascade refrigeration system have an effect on the COP of this system.
Study on the Performance and Emission Characteristics of a DI Diesel Engine Operated with LPG / Bio-diesel Blended Fuel
Lee, Seok-Hwan ; Oh, Seung-Mook ; Choi, Young ; Kang, Kern-Yong ;
Journal of the Korean Institute of Gas, volume 14, issue 1, 2010, Pages 8~14
In this study, we experimentally investigated a compression ignition engine operated with Bio-diesel blended LPG fuel. In particular, the performance, emissions characteristics (including total hydrocarbon, carbon monoxide, nitrogen oxides, and carbon dioxides emissions), and combustion stability of a CI engine fueled with Bio-diesel blended LPG fuel were examined at 1500 rpm. The percentage of Bio-diesel in the fuel blend ranged from 20-60%. The results showed that stable engine operation was possible for a wide range of engine loads up to 40% Bio-diesel by mass. When the Bio-diesel content was increased, leading to a decrease in the lower heating value of the blended fuel, the cetane value increased, resulting in a advanced start of heat release. Exhaust emission measurements showed that THC and CO emissions were increased when using the blended fuel at low engine speeds due to partial burn from over-mixing. NOx emission was emitted less at lower loads and more at higher loads.
A Study on Applicability to Dual-Fuel Engine of Low Caloric Gas
Park, Cheol-Woong ; Lee, Sun-Youp ; Kim, Chang-Gi ; Won, Sang-Yeon ; Lee, Jang-Hee ;
Journal of the Korean Institute of Gas, volume 14, issue 1, 2010, Pages 15~20
The interest on the utilization of landfill gases and biogases for energy production has been increasing due to environment concerns and global warming caused by burning fossil fuels, renewable nature of these gases. Using those synthesis gases to generate energy with engine encourages more efficient collection reducing emissions into the atmosphere and generates revenues for the operators. However the lower calorific value of synthesis gases than that of LPG or CNG affects the combustion stability and power output. Thus it becomes necessary to address disadvantages involved by studying synthesis gases in technological perspective. This paper discussed synthesis gas as a fuel for 60kW dual-fuel engine to produce power in an effective way. The methane diluted with
was used as a fuel and developed ECU and injector driver facilitated the investigations with diesel fuel.
Study of LNG Reliquefaction Process in LNG Carriers
Ko, Byoung-Seok ; Kim, Bum-Su ; Lee, Heon-Seok ; Kang, Yun-Jin ; Kim, Min-Seop ; Ko, Jae-Wook ;
Journal of the Korean Institute of Gas, volume 14, issue 1, 2010, Pages 21~27
In the past vaporized gases from a carrier were burned or used for fuel. Due to the movement of bigger LNG carriers and using diesel engine, it is limited that ways of deposing vaporizes gases from the carrier by the act of environment. For getting over the problem, a reliquefaction process is considered. Even though the reliquefaction process was created to three generation process, it has been researched and developed to optimize the process. Basically the reliquefaction process is compartmentalized into Reverse Brayton Cycle System and Claude Cycle System. This research is focused on the reliquefaction efficiency with the systems and changing equipments arrangement by using HYSYS. The result could be use for a design of a reliquefaction process.
Study on Fire.Explosion Accidents Prediction Model Development of LPG Vaporizer
Ko, Jae-Sun ;
Journal of the Korean Institute of Gas, volume 14, issue 1, 2010, Pages 28~36
We have garnered 3,593 data of gas accidents reported for 12 years from 1995, and then analyzed the LPG vaporizer accidents according to their types and causes based on the classified database. According to the results the gas rupture has been the most common accident followed by the release, explosion and then fire accidents, the most frequent accident-occurring sub-cause is LPG check floater faults. In addition, we have applied the Poisson Probability Functions to predict the most-likely probabilities of fire, explosion, release and rupture with the LPG vaporizer in the upcoming 5 years. In compliance with Poisson Probability Functions results, in the item which occurs below 3 "LPG-Vaporizer-Fire", in the item which occurs below 5 "LPG-Vaporizer-Products Faults-Check Floater" and the item which occurs below 10 appeared with "LPG-Vaporizer-Products Faults". From this research we have assured the successive database updating will highly improve the anticipating probability accuracy and thus it will play a key role as a significant safety- securing guideline against the gas disasters.
Quantitative Analysis of Thermal Radiation in Flare Stack
Jung, Sang-Yong ; Lee, Heon-Seok ; Kim, Bum-Su ; Yoo, Jin-Hwan ; Park, Chul-Hwan ; Ko, Jae-Wook ;
Journal of the Korean Institute of Gas, volume 14, issue 1, 2010, Pages 37~41
The most important element for improving the process safety that occurs from the flare system installed to convert into safe materials by burning the inflammable or toxic gases within the process and this is specified in the API 521 Code so that the radiation does not cause a risk factor. The flames that occur from the flare stack holds the shape of jet fire due to the pressure and flow velocity of discharge gas. This study has identified the shape of flames by using the Chamberlain Model rather than the API 521 Code method, analyzing the radiation due to this.
Study on the Comparison of New and Used Reliquefaction System of Boil-Off-Gas by LNG Cold Energy
Lee, Dong-Hyuck ; Jang, Chang-Bong ; Jung, Sang-Yong ; Kim, Jung-Hwan ; Lee, Heon-Seok ; Kim, Bum-Su ; Ko, Jae-Wook ;
Journal of the Korean Institute of Gas, volume 14, issue 1, 2010, Pages 42~46
BOG(Boil Off Gas) is formed about 0.05 vol%/day from LNG(Liquefied Natural Gas) tanks of LNG receiving terminal. To recycle the BOG using direct contacting, Previously the quantities of LNG and BOG is mixed at the ratio of 11:1 by mass. However simple this process uses, there is the difficulty of processing operation resulted from decrease of using LNG in summer. To complement these shortcomings, Advantages of the process are investigated by comparison of cost and analysis of the indirect contact method using LNG cold energy. It was studied that principles and types of development using LNG cold energy which is abandoned in the carburettor and found how to contact each to find the appropriate cold energy development process. Therefore, in this research, the indirect contact method will be investigated the feasibility of a comparative analysis by using HYSYS.
A Study on the Development of Unified Ball Valve and Polyethylene-Steel Pipe Via Virtual Manufacturing and Experimental Approach
Suh, Yeong-Sung ; Yoo, Je-Hyuk ; Ji, Min-Wuk ; Song, Jeong-Hyun ; Lee, Jae-Yoon ;
Journal of the Korean Institute of Gas, volume 14, issue 1, 2010, Pages 47~54
In order to reduce the number of installation processes and the cost, a unified ball valve and polyethylene-steel pipe is proposed and tested. An integrated design approach is carried out such that a virtual manufacturing based on finite-element analysis is first performed in order to examine contact conditions under exaggerated temperature variations (
for summer and winter, respectively). From the final design configuration, it was predicted that the maximum contact pressures are 71 and 8.1 MPa for summer and winter, respectively, at relatively larger contact surface. Based on this observation, a prototype model is fabricated to go through an actual leakage test. The prototype pipe passed a hydrostatic strength test successfully, showing no leakage at even much higher (54 MPa) than the operational pressure (0.25 MPa).