METHOD FOR CONTROLLING OVER-COOLING OF AQUEOUS SOLUTION, DEVICE FOR CONTROLLING OVER-COOLING OF AQUEOUS SOLUTION, ICE THERMAL STORAGE DEVICE WITH AQUEOUS SOLUTION, COOLING DEVICE WITH AQUEOUS SOLUTION AND COOLING SYSTEM WITH AQUEOUS SOLUTION

摘要

PROBLEM TO BE SOLVED: To provide a method for controlling over-cooling of aqueous solution and a device for controlling over-cooling aqueous solution capable of over-cooling aqueous solution in an aqueous solution circuit to prevent occurrence of unconditional releasing of over-cooling through evaporation latent heat of refrigerant when a refrigerator is re-started and capable of restricting closing of a flow passage in the aqueous solution circuit along with freezing of aqueous solution.;SOLUTION: This invention comprises: a step for calculating a concentration of aqueous solution on the basis of a liquid plane of aqueous solution in an ice thermal storage tank 34 arranged in an aqueous solution circuit 14 to receive ice slurry when a refrigerator is restarted, and estimating a freezing temperature of the aqueous solution on the basis of the calculated concentration of aqueous solution; a step for initial setting an evaporating temperature TE of the refrigerant in such a way that a temperature difference between the estimated freezing temperature of the aqueous solution and the evaporating temperature TE may become a specified value ΔT; and a step for changing-over from the estimated freezing temperature of the aqueous solution to a measured temperature of the ice slurry generated through releasing of the over-cooling, and adjusting the evaporating temperature TE of the refrigerant in such a way that a temperature difference between the measured temperature of the ice slurry and the evaporating temperature TE of the refrigerant may become the specified value ΔT.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT