Patent ID: 8528347

Claim:
A method for controlling freezing capacity of a fixed-frequency freezing AC ice-water system having a plurality of supply ends and a plurality of requirement ends, wherein each of the requirement ends has individual current temperature and temperature loss rate and operates according to a corresponding operating procedure, the method comprising the steps of: (1) defining the operating procedures corresponding to the requirement ends, respectively, such that each of the operating procedures has a corresponding defined high-low temperature range; (2) having at least one of the supply ends supply a total freezing capacity currently required by the requirement ends so as to maintain the current temperatures of the requirement ends within the respective corresponding high-low temperature ranges for a current time period; (3) assessing temperature rising time for the individual current temperature of each of the requirement ends to rise to an upper limit of the corresponding high-low temperature range according to the current temperature and temperature loss rate of each of the requirement ends; (4) determining whether difference between the temperature rising time of any two of the requirement ends is greater than a certain value; if yes, having the supply ends perform a pre-cooling procedure to the requirement end that has the shortest temperature rising time so as to reduce temperature thereof and returning to step (3), otherwise, proceeding to step (5); and (5) when the individual current temperatures of the requirement ends rise to the upper limits of the respective corresponding upper-lower temperature ranges at the same time, having at least one of the supply ends supply a predetermined total freezing capacity to reduce the individual current temperatures of the requirement ends, thereby maintaining the requirement ends within the respective corresponding high-low temperature ranges for a predetermined time period.