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A self-optimizing, capacity control system for a refrigeration system including a compressor, a condenser, and an evaporator, all connected in a closed refrigeration circuit is provided. The compressor includes a plurality of adjustable inlet guide vanes, a motor connected to regulate the inlet guid

A self-optimizing, capacity control system for a refrigeration system including a compressor, a condenser, and an evaporator, all connected in a closed refrigeration circuit is provided. The compressor includes a plurality of adjustable inlet guide vanes, a motor connected to regulate the inlet guide vanes position and an electrical speed motor connected to drive the compressor. The self-optimizing capacity control system includes a microprocessor responsive to continual measurements of a PRV signal, a compressor head signal, a motor current signal and a motor speed signal for determining both the compressor speed and the position of the inlet guide vanes to define a current operating point in an initial surge surface array stored in a random-access memory. The microprocessor will initiate a “learning”mode in which the compressor motor speed will continually be decreased incrementally and the PRV will be moved to a more open position until an operating point is found where the compressor is surging. The microprocessor will update the initial surge surface array stored in the random-access memory with the latest surge conditions. Then, the microprocessor will initiate an “operating”mode in which the PRV are moved to a position responsive to a temperature error signal related to the difference between the chilled water temperature and the temperature set point and the compressor speed is set a safety margin away from the surge speed.

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A self-optimizing, capacity control system for a refrigeration system, including a compressor, a condenser, and an evaporator, all connected in a closed refrigeration circuit, which compressor includes a plurality of adjustable inlet guide vanes, a motor connected to regulate the inlet guide vanes p

A self-optimizing, capacity control system for a refrigeration system, including a compressor, a condenser, and an evaporator, all connected in a closed refrigeration circuit, which compressor includes a plurality of adjustable inlet guide vanes, a motor connected to regulate the inlet guide vanes position, and an electrical variable speed motor connected to drive the compressor, said control system comprising: means for sensing the absolute condenser pressure to generate a first signal; means for sensing the absolute evaporator pressure to generate a second signal; means for sensing the amplitude of the current flowing in the compressor drive motor to generate a third signal; means for sensing the actual speed of the compressor drive motor to generate a fourth signal; means for sensing the physical position of the inlet guide vanes to generate a fifth signal; means for sensing the temperature of the chilled water discharged from the evaporator to generate a sixth signal; means for sensing a temperature set point to generate a seventh signal; and microprocessor means responsive to said first through seventh signals to generate control signals to regulate automatically both the speed of the compressor drive motor and the position of the inlet guide vanes based upon a continually updated “learned”chiller surge surface so as to realize a minimum overall chiller energy consumption.