Abstract: A direct contact thermal storage test device is designed and some ice-making phenomena are observed. By regulating or changing the position of spouts in the ice-making tank, the jet velocity of refrigerating medium, the stirrer turning on-off and the concentration of glycol solution, plenty of tests and analysis on the temperature distribution and temperature decreasing in the tank are carried out and volumetric heat transfer coefficient in the ice-making tank is computed in the light of the law of conservation of energy. It is found that the volumetric heat transfer coefficient can be raised by heightening the spout position, turning on the stirrer, enhancing the velocity and decreasing the concentration of glycol solution.

Key words: Binary ice, Direct contact, Volumetric heat transfer coefficient