초록 ▼

A multiple chiller control system includes a temperature controller TC, a data base and optimizer DBO, and a plurality of driven-servo loops DSL1, DSL2, . . . DSLn. The temperature controller and the data base and optimizer monitor various parameters of the chilled water system. At periodic interval

A multiple chiller control system includes a temperature controller TC, a data base and optimizer DBO, and a plurality of driven-servo loops DSL1, DSL2, . . . DSLn. The temperature controller and the data base and optimizer monitor various parameters of the chilled water system. At periodic intervals, the system determines and stores the current values of these parameters. From this data, and from data determined from operator-selected signals supplied to the temperature controller, the temperature controller determines if a change in total operating capacity is required. If this determination is affirmative, the temperature contoller supplies a request for a system capacity adjustment to the data base and optimizer, which then proceeds to select the chillers to be operated and to adjust the capacity of the chillers so selected. In doing so, the data base and optimizer refers to a data base consisting of a matrix for each chiller that has stored therein chiller coefficient of performance values that are periodically updated to reflect actual chiller operation. The data base and optimizer uses an investigation of its data base to determine that combination of chillers and the operating capacity of each that will provide an optimum system coefficient of performance in meeting the requirement for a system capacity adjustment and correspondingly provides start/stop signals and desired operating capacity signals to the driver-servo loops which responsively provide capacity adjustment signals to the chillers.

대표청구항 ▼

A method for maintaining at an optimum the overall efficiency of a chilled water system for a building, the system including multiple variable-capacity chillers, said method comprising the steps of: providing a data base including multiple matrices, each matrix being associated with a chiller of the

A method for maintaining at an optimum the overall efficiency of a chilled water system for a building, the system including multiple variable-capacity chillers, said method comprising the steps of: providing a data base including multiple matrices, each matrix being associated with a chiller of the chilled water system and having stored therein chiller coefficient of performance values at locations that correspond to various values of at least the following parameters also stored in the matrix: the operating capacity of the chiller; and, the total operating capacity for the chilled water system; determining a new total operating capacity value in response to a request for a chilled water system capacity adjustment; investigating said data base to determine how said new total operating capacity value can be optimally apportioned among the chillers of the chilled water system by: from said matrices, those chiller coefficient of performance values corresponding to said new total operating capacity value and selecting, from said matrices, the chiller operating capacity values for said selected chiller coefficient of performance values; determining, from said selected chiller operating capacity values, those combinations of chiller operating capacity values that substantially equal said new total operating capacity value; determining, from said selected chiller coefficient of performance values, a system coefficient of performance value for each said combination; selecting that one of said combinations that provides an optimum system coefficient of performance value; and, adjusting the actual operating capacity of each chiller in accordance with said selected combination.