Patent ID: 6202431
Filing Date: 2001-03-20
Classification: F04D,F25B

Abstract:
A method for automatically calibrating a surge control of a refrigeration system including a centrifugal compressor, a condenser, pre-rotational vanes, a load, and an evaporator through which a chilled liquid refrigerant is circulated, said method comprising:sensing a presence of a surge condition;sensing a head parameter representative of the head of the compressor;sensing a load parameter representative of the load; andstoring the head parameter and the load parameter when the surge condition is sensed as calibration data to be used by the control of the refrigeration system;sensing a present head parameter representative of the present head of the compressor;sensing a present load parameter representative of the present load; andcontrolling the operation of a hot gas bypass valve so as to avoid surging in the compressor in response to the present head parameter, the present load parameter, and the stored control calibration data.