Patent ID: 6915643

Claim:
A method of making ice by underwater supercooling release by supplying supercooled water to a closed vessel and also supplying through a sub-flow line sub-flow water containing seed ice to said closed vessel and releasing the supercooled state of said supercooled water under water, wherein are provided a first step for generating vortex flow spiraling in an erect, cylindrical container by spouting from the bottom part of said container a mixture containing residual supercooled water after said supercooling release and the ice nuclei generated by said releasing, and a second step for achieving supercooling release of said residual supercooled water by increasing the frequency of contact between said residual supercooled water and said ice nuclei through the agitation of said mixture caused by said vortex flow, which continues until the flow is pushed out from the outlet provided in the upper portion of said erect, cylindrical container.