Patent ID: 8733115

Claim:
A method for controlling freezing capacity of a variable-frequency freezing AC ice-water system having a plurality of supply ends and a plurality of requirement ends, each of the requirement ends having individual current temperature and temperature loss rate and operating according to a corresponding operating procedure, the method comprising the steps of: (1) defining a plurality of operating procedures corresponding to the requirement ends, respectively, such that each of the operating procedures has a corresponding defined high-low temperature range; (2) supplying by the supply ends a current total freezing capacity required by the requirement ends so as to maintain the current temperature of each of the requirement ends within the corresponding high-low temperature range during a current time period; (3) assessing a predetermined total freezing capacity required to maintain each of the requirement ends within the corresponding high-low temperature range for a predetermined time period according to the current temperature and temperature loss rate of each of the requirement ends; and (4) determining whether a difference between the predetermined total freezing capacity and the current total freezing capacity reaches a certain value, if yes, utilizing the high-low temperature range of the operating procedure of each of the requirement ends as a temperature buffer zone so as to reassess the predetermined total freezing capacity required for maintaining each of the requirement ends within the corresponding high-low temperature range during the predetermined time period, until the difference between the predetermined total freezing capacity and the current total freezing capacity is less than the certain value, and supplying the predetermined total freezing capacity from the supply ends for the predetermined time period, otherwise, if the difference between the predetermined total freezing capacity and the current total freezing capacity is determined to be less than the certain value, supplying the predetermined total freezing capacity from the supply ends for the predetermined time period.