ICE HEAT ACCUMULATOR

PROBLEM TO BE SOLVED: To prevent the dissolution of overcooling within a heat conductive pipe by reforming the heat exchange condition between a refrigerant ant water, to an ice heat accumulator which produces ice by producing overcooled water by a full liquid shell and tube heat exchanger. SOLUTION: To a device which is equipped with a refrigerant circulating circuit and a water circulating circuit and cools water with a heat accumulator and exchange 42 into overcooled condition and mixes ice nuclei produced with an ice nuclei generator 42 into this water and dissolves overcooled condition so as to manufacture ice, the heat accumulator ant exchanged 42 is constituted of a full liquid type of shell ant tube type where a plurality of heat conductive pipes 49, 49,... are arranged within a container 48, and water, inside the heat conductive pipe 49, and a refrigerant, in the refrigerant circulation space 48c outside the heat conductive pipe 49, are let flow. Water is let flow from upper side to down side to the heat conductive pipe 49. The refrigerant is let flow from down side to upper side into the refrigerant circulation space 48c.