수직 원통형 축열조내 물의 응고 과정시 열전달에 관한 실험적 연구(작동 유체의 유동방향에 따른 열저장 성능 비교)

A Study of Heat Transfer during Freezing Process of Water in a Vertical Cylinder.

Heat transfer phenomena during freezing process of the water in a vertical cylinder were experimentally studied. Purified water was inserted into the vertical cylinder Experiment was performed with two conditions ; the inlet temperature of the working fluid was maintained to be -1$0^{\circ}C$ and the direction of the working fluid was to be upward or downward. Both the mean temperature of the liquid and temperature difference of cylinder tube wall in the upward were lower than those in the downward. In addition, shape of ice layer in the upward was more uniform than that in the downward. Finally, time-varying total heat energy stored in the water in the upward was higher than that in the downward.