F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
341/28, 62/40
F04D 27/02 (2006.01) F25B 1/04 (2006.01) F25B 1/053 (2006.01) F25B 49/00 (2006.01) F25B 49/02 (2006.01)
Patent
CA 1237182
-24- CAPACITY CONTROL SYSTEMS FOR INVERTER-DRIVEN CENTRIFUGAL COMPRESSOR BASED WATER CHILLERS ABSTRACT: A capacity control system for a refrigeration system including a compressor (20), a condensor (22), and an evaporator (28), all connected in a closed refrigeration circuit is provided. The compressor includes a plurality of adjustable inlet guide vanes (31), a motor (32) connected to regulate the inlet guide vanes position, and an electrical speed motor (36) connected to drive the compressor. The capacity control system includes a micropro- cessor responsive to continual measurements of a PRV signal, a compressor head signal and a suction flow signal for calculating a current operating point. The microprocessor determines whether the operating point is sufficiently away from a surge surface. The microprocessor will cause the operating point to move to a new operating point of a lower compressor speed and a more open PRV position if the operating point is sufficiently away from surge. In order to accomplish this, the microprocessor generates con- trol signals to adjust both the speed of the com- pressor drive motor and the position of the inlet guide vanes. In an alternate embodiment, the micro- processor is responsive to continual measurements of a PRV signal, a motor speed signal, and a suction flow signal for generating such control signals.
488617
Erth Richard A.
Kountz Kenneth J.
Macrae & Co.
York International Corporation
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