Control method and apparatus for a centrifugal chiller using a v

Rotary kinetic fluid motors or pumps – With control means responsive to non-cyclic condition... – Plural diverse condition responsive

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415 30, 415 36, 417 19, 62217, 622284, F04D 2702

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active

055539971

ABSTRACT:
A method of controlling the operation of a centrifugal compressor in a water chiller system. The compressor's capacity is variable by modulating its speed of rotation or by modulating its inlet guide vane's position. The water chiller includes an evaporator having a leaving water temperature. The method comprises the steps of: monitoring the leaving water temperature; determining if the leaving water temperature is in a steady state; modulating the compressor capacity by modulating speed of rotation if the leaving water temperature is in a steady state; and modulating the compressor capacity by modulating inlet guide vane position if the leaving water temperature is not in a steady state.

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