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다채널 편평관의 응축 열전달 및 압력강하특성에 관한 실험
전창덕,정재원,이진호,Jeon, C.D.,Chung, J.W.,Lee, J.H. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.3
In this study, an experiment was performed to investigate the characteristics of pressure drop and heat transfer of multi-channel tubes for automotive condenser using HFC-134a as an alternative refrigerant. The mass flux and inlet saturation pressure of the refrigerant were controlled, respectively, in the range of 200 to $500kg/m^2s$ and 1.0 to 1.6MPa. Pressure drop and heat transfer coefficient were compared with the previously proposed correlations and new correlations based on Traviss' correlation were suggested. Prediction of pressure drop and heat transfer coefficient based on the new correlations agrees with experimental results within ${\pm}9%$ and -18~+11%, respectively.
〈학술논문〉가온공기 분사를 통한 실외기 코일 착상지연 효과
박철승(C. S. Park),전창덕(C. D. Jeon) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
The object of this experimental study is to investigate the effect on frost delay by injecting the warm air on outdoor coil surfaces at frost conditions (2℃/1℃). The heat pump with the injection of warm air makes frost delay time longer. Maximum COP in case of injecting warm air is 7.1% higher than that in case of no warm air injection. Also in case of moving air injection duct faster, the frost delay time is lengthened and its COP is enhanced more.
루우버휜형 열교환기의 유동구조 및 압력강하 특성에 관한 연구
이교승,전창덕,이진호,Lee, K.S.,Jeon, C.D.,Lee, J. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.2
Experimental studies were performed to determine the characteristics of flow structure and pressure drop in 15 : 1 scale models of multi-louvered fin heat exchanger in a wide range of variables($L_P/F_P=0.5{\sim}1.23$, ${\theta}=27^{\circ}{\sim}37^{\circ}$, $Re_{LP}=50{\sim}2000$). Flow structure inside the louvered fin was analyzed by smoketube method and new correlations on flow efficiency and drag coefficient were suggested. The new definition for flow efficiency, which modifies the existing flow efficiency, can predict the flow efficiency in the range above mentioned and is represented as a function of Reynolds number, louver pitch to fin pitch ratio, louver angle at low Reynolds number. Drag coefficient which is defined here is a function of Reynolds number, louver pitch to fin pitch ratio, louver angle below critical Reynolds number, and can be represented by a function of louver pitch to fin pitch ratio only above the critical Reynolds number.