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초소형 밀폐형 이상 써모싸이폰 기포의 거동에 관한 해석적인 연구
이윤표,이영수,이영,Lee, Y.P.,Lee, Y.S.,Lee, Y. 대한설비공학회 1993 설비공학 논문집 Vol.5 No.2
The rise of a large gas bubble or slug in a Micro Two-Phase Closed Thermosyphon with a thin wire insert has been analiged by the potential flow theory. The effect of the interfacial surface tension is explicitly accounted by application of the Kelvin-Laplace equation and solved for the bubble shape. The solution is expressed in terms of the Stokes stream function which consists of an infinite series of Bessel functions. The conditions of the bubble movement in a Micro Two-Phase Closed Thermosyphon were theoretically ascertained.
이윤표,윤성영,이춘식,Lee, Y.P.,Yoon, S.Y.,Lee, C.S. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.3
In this study, experimental investigations to find cold energy storage performance have been made for two different temperatures at condenser. Temperatures at inlet and outlet of condenser were measured to calculate global heat transfer coefficient of direct contact method in our cold energy storage system. Also storage performance by direct contact method was compared with that of Ice-On-Coil type ice storage which was calculated by analytic solution. Results show that, in the case of $-8.0^{\circ}C$ at condenser inlet, heat transfer coefficient of direct contact method is 3.25 times higher than that of conventional method and COP of system is improved by using R141b as refrigerant which produces gas hydrate and has higher phase change temperature than $0.0^{\circ}C$.
순환유동층 열교환기 내의 화울링 저감 및 열전달 향상 기구
이윤표,윤성영,정종수,김내현,Lee, Y.P.,Yoon, S.Y.,Jurng, J.S.,Kim, N.H. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.3
A modified circulating fluidized bed heat exchanger under severe fouling condition is developed. The effects of fouling deposits on the performance of a heat exchanger are investigated. The principle and operating characteristics of a circulating fluidized bed heat exchanger are dicussed. A modified circulating fluidized bed heat exchanger shows more stable operating than the other circulating fluidized bed heat exchanger. The characteristics of self cleaning and heat transfer enhancement of a circulating fluidized bed heat exchanger are studied. The movement of spherical particles in a tube is visualized and heat transfer enhancement and scale reduction mechanism by particles are investigated.