Refrigeration – Automatic control – Refrigeration producer
Patent
1987-02-10
1987-12-29
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62217, 62230, 622283, F25D 1702, F25B 100
Patent
active
047151900
ABSTRACT:
A control and method for varying the capacity of a centrifugal chiller system used to cool a liquid to a setpoint temperature. The control permits the user to select the setpoint, the control gain, and two variables that determine a first deadband and a second relatively wider deadband about the setpoint. If the absolute value of the difference (error) between the actual fluid temperature and the septoint is increasing, the control uses the first deadband, and conversely, if the error is decreasing, it uses the second deadband to vary chiller capacity. The control also permits the user to select a limit for various operating parameters associated with protective shutdown of the system to avoid catastrophic failure, and adjusts the chiller capacity according to one of two predefined functions of the deviation of the operating parameter from its limit, dependent on whether that deviation is greater or less than a predefined deadband.
REFERENCES:
patent: 4356961 (1982-11-01), Smith
patent: 4539820 (1985-09-01), Zinsmeyer
patent: 4562531 (1985-12-01), Enterline et al.
patent: 4608833 (1986-09-01), Kountz
Han Doyoung
Renaud Merle A.
American Standard Inc.
Beres William J.
Harter Robert J.
Lewis Carl M.
Tanner Harry B.
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