System and method for noise attenuation of screw compressors
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United States of America Patent
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Jun 17, 2008
Grant Date -
Jun 9, 2005
app pub date -
Dec 4, 2003
filing date -
Dec 4, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system is provided for attenuating noise in at least two positive displacement compressors proximately located from each other for use with at least one heating or cooling system. A lead compressor and a lag compressor have a selectably controllable rotational speed and a selectably controllable phase of operation. A controller selectably controls the rotational speed and the phase of operation of each of the compressors. The controller controls the rotational speed of the compressors at a predetermined rotational speed that is substantially the same for each of the compressors. The controller controls the phase of operation of the compressors by shifting the phase of operation of the lag compressor so that an outlet pressure pulse operatively produced by the lag compressor is substantially evenly spaced between successive outlet pressure pulses operatively produced by the reference compressor.
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