Refrigeration – Automatic control – Refrigeration producer
Reexamination Certificate
2005-03-10
2008-08-12
Tyler, Cheryl J. (Department: 3744)
Refrigeration
Automatic control
Refrigeration producer
C062S196100, C062S196300, C062S200000, C062S204000, C062S210000, C062S228100, C062S510000, C417S254000
Reexamination Certificate
active
07409833
ABSTRACT:
An apparatus and method for compressing gas refrigerant using two different compressors operated alternatively in a series or parallel mode for obtaining two different compression ratios and thereby provide efficient operation for both a relatively lower suction pressure and a relatively higher suction pressure. This system avoids an unbalanced mass flow rate when the compressors are operated in series by unloading a downstream one of the compressors. When operated in the series mode, refrigerant is bypassed back to a suction inlet of the downstream compressor during a portion of a compression stroke of the downstream compressor for equalizing the mass flow rate through the two compressors.
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Collins Joshua E.
Unger Reuven Z. M.
Corrigan Joseph
Foster Frank H.
Kremblas, Foster Phillips & Pollick
Sunpower, Inc.
Tyler Cheryl J.
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