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증기응축용 직접접촉식 열교환기의 냉각수 유량과 내부압 변화에 따른 열전달 특성연구(LNG 기화기와의 조합목적)
이병철,한승탁,김종보,Lee, B.C.,Han, S.T.,Kim, C.B. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.3
Heat transfer characteristics of a direct contact heat exchanger utilizing sieve trays and spray nozzles for steam condensation for the purpose of combining with a LNG evaporator have been investigated with various cooling water flow rates and different vacuum pressures within the heat exchanger for the purpose of steam condensation. Temperature profiles and the volumetric overall heat transfer coefficients in a direct contact heat exchanger have been obtained for comparisons. The results show that the temperature differences between cooling water and steam along the direct contact heat exchanger height are rapidly decreasing and the volumetric overall heat transfer coefficients of the exchanger improves greatly as the inside vacuum pressure increases. The values of the overall heat transfer coefficients at P=-680mmHg have been increased significantly compared with at atmospheric pressure. At given pressure conditions, it is found that the values of average volumetric overall heat transfer coefficients for the sieve tray are found to be approximately 10% higher than those of the spray nozzle.
전력품질 개선장치를 위한 간단한 구조의 전압변동 발생기
이병철(B.C. Lee),최성훈(S.H. Choi),팽성환(S.H. Paeng),노의철(E.C. Nho),김인동(I.D. Kim),전태원(T.W. Chun),김흥근(H.G. Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
This paper deals with a simple structured voltage disturbance generator for power quality improving devices. The proposed generator can be applied to the performance test of custom power devices. Voltage sag, swell, outage, unbalance and phase jump after outage are provided by the generator. The improving phase jump operating principle of the generator is described and analysed. The usefulness of the generator is verified through simulation.
이병철(B.C. Lee),최성훈(S.H. Choi),팽성환(S.H. Paeng),노의철(E.C. Nho),김인동(I.D. Kim),전태원(T.W. Chun),김흥근(H.G. Kim) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper deals with power quality disturbance generator with phase jump function. The proposed generator can be applied to the performance test of custom power devices. Voltage sag, swell, outage, unbalance and phase jump after outage are provided by the generator. The phase jump operating principle of the generator is described and analysed. The control scheme of the disturbance generator is simple and hardware setup is cost effective compared with the conventional scheme. The usefulness of the generator is verified through simulation and experimental results.