http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
볼텍스 튜브의 에너지 분리효율 최적화를 위한 기하학적 형상 연구
임석연(Seokyeon Im),유상석(Sangseok Yu) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Vortex tubes are used in many industrial fields as parts for refrigerating machines due to their many intrinsic benefits. Although the use of these types of tubes has become common, the characteristics of energy separation associated with these tubes have yet to be vigorously researched. In this study, a counter-flow type of vortex tube is employed to investigate the energy separation characteristics with various geometric configurations. A parametric study was conducted to evaluate the performance of the vortex tube with various geometric structures and operating inlet pressures. The results show that variation of the cold exit orifice hole diameter significantly influences the energy separation between two exits.
초음파 에너지 조사 시간과 분사지연에 따른 BD20의 디젤기관 연소특성에 관한 실험 연구
임석연(Seokyeon Im),조성철(Sungchul Jung),정영철(Youngchul Jung),박성영(Sungyoung Park),최두석(Dooseuk Choi),류정인(Jeongin Ryu) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An object of this study is to understand the correlation between the characteristics of an engine performance and combustion, applying BD20 fuel reformed by ultrasonic energy irradiation to diesel engines. Before conducting the main experiment, an experiment was performed to determine the optimum injection timimg of the fuel used in applying the ultrasonic energy irradiation to BD20. To control the duration of the ultrasonic energy irradiation, the capacity of an ultrasonic energy fuel supply system was tested with 550㏄ and 1100㏄ chambers. As the result of the analysis of the regular BD20 and BD20 to which ultrasonic energy irradiation was applied, the BSFC and the Power of the irradiated BD20 was improved 3% and 6%, respectively compared to those of non-irradiated BD20. When the fuel injection timing was delayed by 5°, the engine power was improved by 3%, and the BSFC was improved by 2%. The maximum combustion pressure of irradiated BD20 was improved by a maximum of 6% in comparison to that of regular BD20, and demonstrated a synergistic effect of 3% by delaying the injection timing 5°.
저온 출구의 배압조건에 따른 볼텍스 튜브의 온도분리 특성 연구
임석연(Seokyeon Im) 한국트라이볼로지학회 2016 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.32 No.5
Electric vehicle ownership is expanding for two reasons: its technology features have enhanced fuel economy, and the number of vehicle emissions regulations is increasing. Battery performance has a large influence on the capability of electric vehicles, and even though battery thermal management has been actively researched, specific technological improvements to battery performance are not being presented. For instance, many industrial applications utilize vortex tubes as components for refrigeration machines because of their numerous intrinsic benefits. If electric vehicles incorporate vortex tubes for battery cooling, performance and efficiency advancements are possible. This study uses a counter-flow vortex tube to investigate its temperature separation characteristics, based on the back pressure of the cold air exit and the difference between the inlet and back pressures. The experiment uses a vortex tube with the following parameters: six nozzle holes, a 20 mm inner vortex diameter (D), a 14D tube length, a 0.7D cold exit orifice diameter, and a nozzle area ratio of 0.142. The measurements prove that the temperature difference between the hot air and cold air decreased because of the flow resistance of the hot air and the backflow phenomenon at the cold air exit. The flow resistance causes the temperature difference to decrease, and the back pressure of the cold air exit influences the flow resistance. The results show that the back pressure significantly influences the efficiency of temperature separation.
ASPEN PLUS<SUP>®</SUP>를 이용한 태양열 유기랭킨사이클 열병합 발전시스템의 공동주택 적합도 분석
임석연(Seokyeon Im),김형근(Hyung-Geun Kim),유상석(Sangseok Yu) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.4
본 연구에서는 아파트단지에 적용되는 태양열 급탕 시스템의 에너지 활용도를 높이기 위해 유기랭킨사이클을 적용하여 해석적 연구를 수행하였다. 시스템 해석은 Aspen Plus<SUP>®</SUP> 을 활용하였으며 태양열 집열기는 급탕 온도와 유기랭킨 사이클의 운전 조건을 고려하여 진공관형 집열기를 적용하였다. R134a, R141a, R245fa 등의 냉매를 작동유체로 선정하였으며, 시스템 성능해석을 통하여 R245fa 냉매가 적용가능성이 가장 높게 나타났다. 비가역성 해석과 민감도 해석을 통해 유기랭킨 사이클 시스템의 효율 및 성능 확보를 위해서는 증발기와 터빈에 대한 기술 개발이 매우 중요하다는 것을 밝혀냈으며, 순수 급탕으로만 활용하는 시스템에 전기 생산 설비를 추가하게 되면 약 50%의 추가적인 경제성이 확보됨을 확인하였다. In this study, a solar thermal system is designed to provide hot water and electricity for improvement of solar thermal energy availability in an apartment complex. The electricity is generated with Organic Rankine Cycle (ORC) by the solar thermal energy. R134a, R141b and R245fa are selected for operating fluid of the solar thermal ORC system. ORC with R245fa shows the best performance based on the variation of pressure. The irreversibility of component showed that the technology advance of the evaporator ensures a performance improvement. The sensitivity study results indicate that the turbine performance is most effective way to improve the performance of ORC system. An economic analysis showed that approximately 50% more income could be achieved by a solar thermal ORC system with a hot water supply.
Boidiesel 혼합연료의 초음파 에너지 조사 시간에 따른 물리적ㆍ화학적 특성에 관한 실험 연구
임석연(Seokyeon Im),송용식(Yongsik Song),정영철(Youngchul Jung),최두석(Dooseuk Choi),류정인(Jeongin Ryu) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this study is to understand the physical and chemical characteristics of Biodiesel blended fuel that is reformed by ultrasonic energy irradiation. To understand the characteristics, the mixing of commercial diesel fuel and biodiesel was compared and analyzed according to whether or not ultrasonic energy irradiationwas performed and also the duration of irradiation. The result of the experiments indicates that when ultrasonic energy irradiation was performed on biodiesel blended fuel, its viscosity decreased by 3~7%. In the case of BD20, when the ultrasonic energy irradiation was performed, its sauter mean diameter(SMD) dropped by 12% on average. As the irradiation time increased, the volume ratio of olefins increased up to a maximum 2.7%, and the Higher heating value increased to a maximum of 5.8%. On the contrary, the ratio of aromatics decreased by a maximum 2.7%, and BI decreased by a maximum of 7%.
초음파 조사 바이오디젤 혼합연료의 Common-rail형 디젤기관 적용 특성에 관한 연구
임석연(Seokyeon Im),정영철(Youngchul Jung),박성영(Sungyoung Park),최두석(Dooseuk Choi),류정인(Jeongin Ryu) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This is an experimental study on characteristics of engine performance and discharged materials in common-rail type diesel engine. The bio-diesel fuel is mixed with the diesel fuel in common use at the ratio of 20% or 100%. The diesel fuel and blended fuel is irradiated by ultrasonic wave energy. The diesel fuel, blended fuel, reformed diesel fuel and reformed blended fuel by ultrasonic wave energy is applied to the experimental engine individually. The results are compared with one of the diesel fuel in common use and analyzed.