being disposed in the ice container 30 fig2 is a graph illustrating the temperature change of the interior and exterior of the ice container 30 in the ice bunker 10 of the ice storage system in accordance with a test conducted by the inventor the x axis of the graph indicates the time of the icing operation while the y axis of the graph indicates the temperature of water ice 40 and the brine water solution 20 curve a indicates the temperature change of the water or ice in the ice container 30 in accordance with this invention curve b indicates the temperature of the brine water solution 20 in the ice bunker 10 in accordance with this invention as indicated in curve a of fig2 it takes about 40 minutes for the water 40 in the ice container 30 to be cooled to 2 5 u00b0 c by the brine water solution 20 the ice cores then begin to form and the water 40 in the ice container 30 begins to solidify subsequently the water 40 continues to solidify at 0 u00b0 c while the temperature of the brine water solution 20 is maintained at 3 u00b0 c referring to fig3 for comparison a test of the temperature change of.