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압력 및 용존산소량이 증류수 과냉각 해소에 미치는 영향
박세창(SeChang Park),정수진(Su-Jin Jeong),박천완(ChunWan Park),이동규(DongGyu Lee),강채동(Chaedong Kang) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
It is proposed that the dissolved air in pure water has been related to the release of supercooling. In this study, a supercooling experiment is performed to test tubes of pure water with three fixed initial dissolved oxygen(DO=4.1, 7.5, and 12.6 mg/L), i.e. dissolved air. The initial DO in each test tube is maintained to constant during supercooling, as possible. And the pressure effect on supercooling release of pure water is observed to supercooling degree and visualization of bubbles enclosed to the ice after full crystallization of the pure water. At results, the distribution and maximum of supercooling degree in each initial DO relate to the initial DO in pure water. Moreover, the supercooling degree of pure water relates to the pressure of the pure water. And the distribution of bubble in ice proves the effect of the initial DO and the pressure of supercooled water.
동시 축ㆍ방열 조건에서 PCM의 열전달 특성에 관한 연구
이동규(Donggyu Lee),박세창(Sechang Park),정동열(Dong-yeol Chung),강채동(Cheadong Kang) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.8
A thermal storage systems was designed to correspond to the temporal or quantitative variation in the thermal energy demand, and most of its heat is stored using the latent and sensible heat of the heat storage material. The heat storage method using latent heat has a very complex phenomenon for heat transfer and thermal behavior because it is accompanied by a phase change in the course of heating/cooling of the heat storage material. Therefore, many studies have been conducted to produce an experimentally accessible as well as numerical approach to confirm the heat transfer and thermal behavior of phase change materials. The purpose of this study was to investigate the problems encountered during the actual heat transfer from an internal storage tank through simulation of the process of storing and utilizing thermal energy from the thermal storage tank containing charged PCM. This study used analysis methods to investigate the heat transfer characteristics of the PCM with simultaneous heating/cooling conditions in the rectangular space simulating the thermal storage tank. A numerical analysis was carried out in a state considering natural convection using the ANSYS FLUENT® program. The result indicates that the slope of the liquid-solid interface in the analysis field changed according to the temperature difference between the heating surface and cooling surface.