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A method for controlling the freezing capacity of a fixed-frequency freezing AC ice-water system, by using temperature buffer difference of individual requirement ends to control the number of operating compressors in a fixed-frequency chiller and make each of the operating compressors have a usage

A method for controlling the freezing capacity of a fixed-frequency freezing AC ice-water system, by using temperature buffer difference of individual requirement ends to control the number of operating compressors in a fixed-frequency chiller and make each of the operating compressors have a usage rate close to 100%. Further, various operating procedures are defined for the requirement ends and each of the operating procedures has an individually defined high-low temperature range such that the freezing capacity supply cycle or startup cycle of the fixed-frequency chiller can be adjusted by using the high-low temperature ranges of the operating procedures as temperature buffer strips, thereby allowing the compressors in the fixed-frequency chiller to operate collectively in order to save energy.

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1. 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 corresp

1. 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. 2. The method of claim 1, wherein the current total freezing capacity further comprises pipeline loss. 3. The method of claim 1, wherein the predetermined total freezing capacity further comprises pipeline loss. 4. The method of claim 1, wherein the high-low temperature range of each of the operating procedures further comprises a secondary high-low temperature range, and temperature values of the high-low temperature range and secondary high-low temperature range are set according to the corresponding operating procedure. 5. The method of claim 4, wherein the operating procedures comprise general operating procedures, pre-cooling procedures and deviation permit procedures, wherein each of the general operating procedures is managed to maintain the current temperature of the corresponding requirement end within the corresponding high-low temperature range, each of the pre-cooling procedures is managed to pre-cool the corresponding requirement end, and each of the deviation permit procedures is managed to maintain the current temperature of the corresponding requirement end within the corresponding high-low temperature range, such that when the current temperatures exceeds the corresponding secondary high-low temperature range for a permit time period, the deviation permit procedure cools or stops cooling the requirement end so as to maintain the current temperature thereof within the corresponding secondary high-low temperature range. 6. The method of claim 1, wherein step (1) further comprises controlling the requirement ends through a round-robin algorithm so as to cause the requirement ends to take turns in performing different operating procedures. 7. The method of claim 1, wherein step (1) further comprises having the requirement ends to perform different operating procedures according to properties of the requirement ends. 8. The method of claim 1, wherein step (1) further comprises controlling the requirement ends through a weighted algorithm so as to make the requirement ends take turns in performing different operating procedures according to properties of the requirement ends. 9. The method of claim 1, wherein the supply ends are fixed-frequency chillers. 10. The method of claim 1, wherein the requirement ends are refrigerators, freezers, blowers and/or air conditioners.