Refrigeration – Processes – Compressing – condensing and evaporating
Reexamination Certificate
2008-02-20
2010-12-28
Ali, Mohammad M (Department: 3744)
Refrigeration
Processes
Compressing, condensing and evaporating
Reexamination Certificate
active
07856834
ABSTRACT:
A centrifugal compressor assembly for compressing refrigerant in a 250-ton capacity or larger chiller system comprising a motor, preferably a compact, high energy density motor or permanent magnet motor, for driving a shaft at a range of sustained operating speeds under the control of a variable speed drive. Another embodiment of the centrifugal compressor assembly comprises a mixed flow impeller and a vaneless diffuser sized such that a final stage compressor operates with an optimal specific speed range for targeted combinations of head and capacity, while a non-final stage compressor operates above the optimum specific speed of the final stage compressor. Another embodiment of the centrifugal compressor assembly comprises an integrated inlet flow conditioning assembly comprising a flow conditioning nose, a plurality of inlet guide vanes and a flow conditioning body that positions inlet guide vanes to condition flow of refrigerant into an impeller to achieve a target approximately constant angle swirl distribution with minimal guide vane turning.
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Ali Mohammad M
McAndrews Held & Malloy Ltd.
Trane International Inc.
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