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POE 오일 나노유체의 열물성과 분산성 평가를 위한 실험적 연구
이규선(Lee K. S.),이근안(Lee K. A.),이종섭(Lee J. S.),이형욱(Lee H. Y.),박성준(Park S. J.),이영선(Lee Y. S.),김상훈(Kim S),장석필(Jang S. P.),김정배(Kim J) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.3
To apply the nanofluids into the general vapor compression cycle, basically have to know the thermal properties including thermal conductivity and dynamic viscosity. And needs to show the dispersion characteristics for various nanofluids and concentrations. So, firstly this study showed experimentally the thermal properties for various concentration (0.1%~0.7%, as mass balance) and temperature(20℃~40℃) on Al₂O₃, TiO₂ and CuO nanofluids using base fluid as POE oil that has used in the scroll compressor for various refrigeration system. From the results, the dynamic viscosity of nanofluids was considerably changed from the base POE oil. And, the dispersion characteristics of various nanofluids using the simple methods like as analyzing the RGB value or measuring the sinking height of nanofluids were showed experimentally. Through the results, the dispersion characteristics of Al₂O₃, nanofluid was better than those of TiO₂, and CuO nanofluids not considering the real refrigeration cycle running conditions.
전동 스크롤압축기의 운전rpm에 따른 냉동사이클의 성능에 대한 실험적 연구
이규선(Lee K. S.),이근안(Lee K. A.),이형욱(Lee H. Y.),이영선(Lee Y. S.),김정배(Kim Jeongbae) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.3
An experimental study was performed estimating COP(Coefficient of Performance) of air-conditioning cycle with inverter scroll compressor. All experiments were done for various compressor speeds from 1000∼4000 rpm and used the inverter controller called CANDy to change the compressor rpm. The air-conditioning cycle components in the apparatus were used as same with components of YF hybrid car. To estimate the COP, this study measured the temperature and pressure at inlets and outlets of compressor, condenser, and evaporator. And also measured the compressor input power using Powermeter. Through the experiments, the maximum error to estimate COP was shown about ±6.09% at 3500rpm. This study revealed that the condenser temperature and pressure were increased and the evaporator temperature and pressure were decreased with the increased compressor speed. And also, the COP was decreased with increased compressor speed. Those results can be used the basic and fundamental data to design the air-conditioning cycle with inverter scroll compressor.
이규선(Lee, Kyu-Sun),이근안(Lee, Geun-An),이종섭(Lee, Jong Sup),이영선(Lee, Young-Seon),김정배(Kim, Jeongbae) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
Two experimental apparatus, for measuring the COP of air-conditioning cycle and estimating the reliabilities applying the nano-fluids into the cycle, were designed and made. The air-conditioning cycle components in the apparatus are purchased like as YF hybrid model. The apparatus for measuring the COP of air-conditioning cycle is designed to measure the compressor power and evaporator heat capacity. So, the compressor power will measure using power meter and the evaporator heat capacity have to measure the inlet-outlet temperature, pressure, and mass flow rate using the flow meter. And the nano-fluids to apply the cycle were chosen as Al2O3, TiO2, and CuO. So, the apparatus for estimating the reliabilities applying the nano-fluids into the cycle was consisted of 4 cycles, respectively for base and three nano-fluids. The 2nd apparatus will operate during about 2.2 years to reveal the performance characteristics including compressor power and running results, temperature and pressure.
이규선(K. S. Lee),이근안(K. A. Lee),이종섭(J. S. Lee),이영선(Y. S. Lee),김정배(J. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
Two experimental apparatus, for measuring the COP of air-conditioning cycle and estimating the reliabilities applying the nano-fluids into the cycle, were designed and made. The air-conditioning cycle components in the apparatus are purchased like as YF hybrid model. The apparatus for measuring the COP of air-conditioning cycle is designed to measure the compressor power and evaporator heat capacity. So, the compressor power will measure using power meter and the evaporator heat capacity have to measure the inlet-outlet temperature, pressure, and mass flow rate using the flow meter. And the nano-fluids to apply the cycle were chosen as A12O3, TiO2, and CuO. So, the apparatus for estimating the reliabilities applying the nano-fluids into the cycle was consisted of 4 cycles, respectively for base and three nano-fluids. The 2<SUP>nd</SUP> apparatus will operate during about 2.2 years to reveal the performance characteristics including compressor power and running results, temperature and pressure.
마이크로 박판 밸브 성형을 위한 마이크로 프레스 시스템 개발
이혜진(Hye-Jin Lee),이낙규(Nak-Kyu Lee),최석우(Seogou Choi),이형욱(Hyoung-Wook Lee),이근안(Geun-An Lee) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
In this paper Research development about a micro metal forming manufacturing system has been developed. A micro forming system has been achieved in Japan and it's developed micro press is limited to single forming process. To coincide with the purpose to be more practical, research and development is necessary about the press which the multi forming process is possible. We set the development of the equipment including micro deep drawing, micro punching and micro restriking process to the goal. To achieve this goal, we set the application product to a micro thin foil valve which is used in the micro pump module. The compound die set has been designed and manufactured to make two step process. The material of thin foil valve is SUS-304 and its thickness is 50㎛. We can get a good forming results from micro punching experiments in this paper.
0.05wt%Al₂O₃ 나노유체를 적용한 냉동사이클의 운전 rpm별 성능
이규선(K. S. Lee),이근안(K. A. Lee),이종섭(J. S. Lee),이영선(Y. S. Lee),김정배(J. Kim) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
The apparatus for measuring the COP of air-conditioning cycle is designed to measure the compressor power and evaporator heat capacity. So, the compressor power will measure using power meter and the evaporator heat capacity have to measure the inlet-outlet temperature, pressure, and mass flow rate using the flow meter. The air-conditioning cycle components in the apparatus are purchased like as YF hybrid model. And the experimental apparatus, for measuring the COP of air-conditioning cycle and estimating the reliabilities applying the nano-fluids into the cycle, were designed and made. The nano-fluids to apply the cycle were chosen as Al2O3, TiO2, and CuO. This study apply 0.05% volume fraction of Al2O3 nanoparticles.