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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.
SRM 인버터의 병렬 스위칭을 위한 새로운 스위칭 패턴
이상훈(S. H. Lee),이상훈(S. H. Lee),정성우(S. W. Jung),임헌호(H. H. LIM),박성준(S. J. Park),안진우(J. W. Ahn) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
A SRM inverter has very low switching frequency, This results m reducing the burden for a high-speed of the gate-amp interface circuit. and the linearity of optocoupler is used to protect the intanteneous peak current for the stable operation<br/> In this paper, series resistor is used to equal the current sharing of each switching device and a linear gate-amp is proposed to protect the intanteneous peak current which occurs in transient state.
출력 전압파형 개선을 위한 새로운 Hybrid형 멀티레벨 인버터
주성용(S.Y. Joo),강필순(F.S. Kang),김철우(S.J. Park),박성준(T.J. Kim),김태진(C.U. kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
This paper presents a novel hybrid type multilevel inverter In order to improve the waveshape of output voltage. The proposed multilevel Inverter is cons1st of two full-bridge modules for level creation and one full-bridge module for PWM operation. The generated levels are total 11-level: 9-level by the level inverter and 2-level by the PWM Inverter. The operational principles and analysis are explained and validity of the proposed system 1S verified through the experimental results using a prototype.