Refrigeration – Automatic control – Refrigeration producer
Patent
1993-08-16
1994-10-18
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
622284, 62204, 62182, 417 19, 417 43, 415 17, F25B 100, F04B 4900
Patent
active
053556917
ABSTRACT:
A controller for controlling the capacity of a centrifugal chiller compressor. The compressor is driven by an electric motor and has variable inlet guide vanes that control the flow of refrigerant to the compressor. The controller establishes a dimensionless plot of possible points of compressor operation relating the pressure coefficient and the capacity coefficient of the compressor. The current operating point of the centrifugal compressor is located on the plot and a dynamic surge boundary control curve is positioned proximate a region of actual surge. Control is exercised responsive to the variations of the region of actual surge and the surge boundary control curve for controlling compressor capacity by varying the opening of the inlet guide vanes and varying the speed of the compressor to move the operating point of the compressor proximate the surge boundary control curve.
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Goshaw Craig M.
Rentmeester Paul C.
Sullivan Brian T.
American Standard Inc.
Beres William J.
Ferguson Peter D.
O'Driscoll William
Tanner Harry B.
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