Refrigeration – Processes – Compressing – condensing and evaporating
Patent
1983-09-22
1984-12-11
Wayner, William E.
Refrigeration
Processes
Compressing, condensing and evaporating
62175, 62208, 165 22, F25B 700
Patent
active
044870280
ABSTRACT:
A control for a variable capacity reciprocating compressor water chiller system. A microprocessor connected to monitor return and supply fluid temperature sensors in the system is programmed to vary the compressor capacity in response to the deviation of the return and supply chilled water temperatures from desired values. The control determines these desired values as a function of predetermined full load return, supply, and reference temperature setpoints, and as a function of the relative loading of the chiller system. The control also functions to selectively offset the chilled water temperatures in one of three control modes. If zone temperature sensors are connected to the control, the offset is a function of the deviation of the weighted average zone temperature from a setpoint. The second control mode allows offset as a function of the outdoor ambient air temperature, and the third, as a function of a temporary setpoint.
REFERENCES:
patent: 3204423 (1965-09-01), Resh, Jr.
patent: 4152902 (1979-05-01), Lush
patent: 4210957 (1980-07-01), Spethmann
patent: 4439997 (1984-04-01), Cantley
Anderson Ronald M.
Lewis Carl M.
The Trane Company
Wayner William E.
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