Reduced compressor capacity controls
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United States of America Patent
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Dec 20, 2011
Grant Date -
Jul 5, 2007
app pub date -
Jun 7, 2006
filing date -
Dec 29, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A method of controlling the frequency of a compressor in a chiller system is disclosed. The method includes determining a nominal minimum frequency of a compressor, and providing a control algorithm for controlling the period of time and the deviation of the actual operating frequency below the nominal minimal frequency that the compressor may operate without shutting down the chiller system. The time period of operation below nominal minimum frequency may be predetermined as a fixed time period of operation below nominal minimum frequency, or as a variable time period based on the amount by which the frequency deviates below nominal minimum frequency. Also, an absolute minimum operating frequency is provided that results in the control algorithm shutting down the chiller system and the compressor.
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