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HCFC-123의 수평 평활관내 응축 전열 특성에 관한 연구
권옥배,오후규,오종택,김성규 한국마린엔지니어링학회 1993 한국마린엔지니어링학회지 Vol.17 No.3
Experimental data on the heat transfer characteristics of HCFC-123 and CFC-11 during condensation in horizontal smooth tube are presented. The experimental apparatus consisted of a closed working fluid loop, coolant loop, and measuring system. The major components of the working fluid loop made of a refrigerant pump, boiler, superheater, refrigerant flow meter, receiver and test section. The tube-in-tube type test section was made of smooth tube which were constructed form 9.52 mm outer diameter of smooth copper tube with 50 mm outside diameter of PVC tube duct. The ranges of parameter, such as refrigerant mass velocity, coolant flow rate, and quality were 90-325kg/($m^2$.s), 60-360kg/h, 5-95% respectively. Data were obtained under steady state condition for annular flow. As a result of these, the condensation heat transfer coefficients for HCFC-123 were slightly lower than those of CFC-11 from 8% to 15% inside horizontal smooth tube. Furthermore, a new generalized correlation for the heat transfer coefficients of HCFC-123 and CFC-11 during condensation inside horizontal smooth tube is proposed.
권옥배(Kwon, Ok-Bae),신창훈(Sin, Chang-Hun),박승수(Park, Seung-Su),한정민(Han, Jeong-Min),이정환(Lee, Jeong-Hwan) 한국신재생에너지학회 2006 신재생에너지 Vol.2 No.2
In Japan, research and development were undertaken on gas hydrate-side industrial processes associated with power generation system connections that may particularly be necessary to develop gas hydrated technology-based industrial systems. In so doing, data and engineering technologies useful n formulating guidelines on design of practical process were accumulated. In addition, basic research into theoretical evidence were carried out to promote and support the development of technological elements for those processes. In basic research designed to promote and support the research and development of elemental technologies, microanalyses were conducted to understand the decomposition mechanism of mixed gas hydrate. Moreover, measurement technologies that can be applied in industrial processes, such as numerical analyses and concentration measurement, were examined. Japan has developed a highly efficient gas hydrate formation process using micro-bubbles with a tubular reactor. Higher formation rate over conventional systems has been obtained by the process. As mentioned above, the technical problems were clarified and the economics were studied from a view point of the NGH technology in this study. The results can be applied for utilization and must contribute to popularization of gas hydrate production.
권옥배(Gwon, Ok-Bae),신창훈(Sin, Chang-Hun),박승수(Park, Seung-Su),한정민(Han, Jeong-Min),이정환(Lee, Jeong-Hwan) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
In Japan, research and development were undertaken on gas hydrate-side industrial processes associated with power generation system connections that may particularly be necessary to develop gas hydrated technology-based industrial systems. In so doing, data and engineering technologies useful n formulating guidelines on design of practical process were accumulated. In addition, basic research into theoretical evidence were carried out to promote and support the development of technological elements for those processes. In basic research designed to promote and support the research and development of elemental technologies microanalyses were conducted to understand the decomposition mechanism of mixed gas hydrate. Moreover, measurement technologies that can be applied in industrial processes, such as numerical analyses and concentration ion measurement, were examined. Japan has developed a highly efficient gas hydrate formation process using micro-bubbles with a tubular reactor. Higher formation rate over conventional systems has been obtained by the process. As mentioned above, the technical problems were clarified and the economics were studied from a view point of the NGH technology in this study. The results can be applied for utilization and must contribute to popularization of gas hydrate production.
방사선 조사에 의한 폐손상에서 Angiotensin-1 Converting Enzyme Inhibitor (Captopril)의 폐섬유화의 경감 효과
권건영,정혜라,권선영,김진희,김옥배 대한병리학회 2004 Journal of Pathology and Translational Medicine Vol.38 No.3
Background : The captopril reduces radiation induced lung injury and fibrosis. We designed a study to evaluate the antifibrogenic effect of Captopril in radiation induced lung injury. Methods : Fifty Sprague-Dawley rats were divided into radiation group (I) (n=30) and radiation plus captopril group (II) (n=15). The rats were sacrificed at 12 hours and 11 weeks after radiation. We examined light microscopic, immunohistochemical and electron microscopic features in each groups. Results : In Group I, the lungs showed acute lung injury at 12 h. The lungs showed patchy fibrosis with collagen deposits at 11 weeks. The severity of the alveolar injury and fibrosis was correlated with radiation doses. The Group II showed less severe lung fibrosis than Group I. The mean numbers of mast cells and myofibroblasts of Group II were lower than Group I (p< 0.05). The TNF- and TGF- were higher expressed according to radiation doses in Group I, and less prominent in Group II. Ultrastructurally, the alveolar cell injury and fibrosis were less severe in Group II. The TUNEL stains showed higher expressions according to radiation doses in Group I, and expressed in Group II. Conclusions : The captopril decreases the number of mast cells and myofibroblasts, reduces collagen deposition and apoptosis of alveolar cells in rat lungs after radiation, and so reduces the degree of pulmonary injury and fibrosis.
세관 내 R-718의 단상 열전달 및 압력강하 특성에 관한 연구
박기원,권옥배,홍진우,손창효,오후규 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.3
Single-phase heat transfer coefficients and pressure drops of R-718 were measured in smooth, horizontal copper tubes with inner diameters of 3.36 ㎜, 5.35 ㎜. 6.54 ㎜ and 8.12 ㎜, respectively. The experiments were conducted in the closed loop, which was driven by a magnetic gear pump. Data are presented for the following range of variables : Reynolds from 1000 to 20000. Single-phase heat transfer coefficients increased by 10∼30 % as the inner diameter of tube was reduced and it was found that a well-known previous correlation, Gnielinski's correlation was not suitable for the small diameter tubes. But the pressure drop in the small diameter tubes have been shown slightly deviations with Blauius' correlation. Based on an analogy between heat and mass transfer. the new heat transfer correlation is proposed to predict the experimental data successfully.