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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.
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.
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.
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.
미래형 자동차 냉동사이클 효율 향상을 위한 실험장치 개발
이규선(K. S. Lee),이근안(K. A. Lee),이종섭(J. S. Lee),장석필,김정배(J. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
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 Al203, 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.
이복희(B.H. Lee),정현욱(H.U.Jung),최종혁(C.H.Choi),조성철(S.C.Cho),백영환(Y.H.Baek),이규선(K.S.Lee),안창환(C.H.Ahn) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월
This paper describes ground surface potential rises and touch voltage. The more soil resistivity of upper layer is lower, the more ground surface potential rise is increased. Ground surface potential rise is increased as the buried depth of ground rod in lowered. Ground surface potential rises were measured in the test site and compared with results by CDEGS program. Touch voltages according to the separation distance of ground rod were measured in four directions. Touch voltages were remarkably changed by separation distance and contact position.