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김상혁,김도향,이종수,박찬경,Kim, S.H.,Kim, D.H.,Lee, J.S.,Park, C.G. 한국현미경학회 1996 Applied microscopy Vol.26 No.2
Amophization and decomposition behaviour in $Mg_{62}Cu_{26}Y_{12}$ alloy prepared by melt spinning method and wedge type metal mold casting method have been investigated by a detailed transmission electron microscopy. Amorphous phase has formed in melt-spun ribbon. In the case of the wedge type specimen, however, the amorphous phase has formed only around the tip area within about 2 mm thickness. The remaining part of the wedge type specimen consists of crystalline phases, $Mg_{2}Cu\;and\;Cu_{2}Y$. The supercooling for crystallization behaviour of the amorphous $Mg_{62}Cu_{26}Y_{12}$ alloy, ${\Delta}T_x$ has been measured to be about 60 K. Such a large undercooling of the crystallization bahaviour enables formation of the amorphous phase in the $Mg_{62}Cu_{26}Y_{12}$ alloy under the cooling rate of $10^{2}K/s$. The amorphous $Mg_{62}Cu_{26}Y_{12}$ has decomposed into crystalline phases, $Mg_{2}Cu\;and\;Cu_{2}Y$ after heat treatment at $170^{\circ}C\;and\;250^{\circ}C$.
복합구동방식을 적용한 열펌프 시스템의 성능 특성에 관한 실험적 연구
김상혁(S. H. Kim),김지영(J. Y. Kim),박윤철(Y. C. Park) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
To improve heating performance of the heat pump in winter season, refrigerant heating device was applied to conventional heat pump. The heating process of the refrigerant was started at the heating capacity doesn't enough to the heating load requirement of the conditioning space or the discharge temperature of the air goes down to below 40℃ which is criterion for comfort of the occupants in the conditioning space. The refrigerant heating has new concept of auxiliary heating device for heat pump in winter. In this study, the system performance was analyzed through experimental study of the proposed system and parametric study was conducted to improve the COP and control strategies.