Refrigerant system unloading by-pass into evaporator inlet

Details Refrigerant system unloading by-pass into evaporator inlet Refrigerant system unloading by-pass into evaporator inlet

2006-01-27

2011-12-06

Norman, Marc (Department: 3744)

Refrigeration

Automatic control

Refrigeration producer

C062S225000, C062S510000

Reexamination Certificate

active

08069683

ABSTRACT:
A refrigerant system has at least one unloader valve selectively communicating refrigerant between the compressor compression chambers and a point upstream of the evaporator. When the compressor is run in unloaded mode, partially compressed refrigerant is returned to a point upstream of the evaporator. In an unloaded mode, a higher refrigerant mass flow rate passes through the evaporator, as compared to prior art where the by-passed refrigerant was returned downstream of the evaporator. This increases system efficiency by more effectively returning oil which otherwise might be left in the evaporator back to the compressor. Also, the amount of refrigerant superheat entering the compressor in unloaded operation is reduced as compared to the prior art compressor systems, wherein the by-passed refrigerant is returned directly to the compressor suction line. Reduced refrigerant superheat increases system efficiency, improves motor performance and reduces compressor discharge temperature. Also, by moving the unloader line further away from the compressor, the compressor replacement is simplified as there is no connecting unloader line directly in front of the compressor.

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Search Report PCT/US06/03211.
International Preliminary Report on Patentability dated Aug. 7, 2008.

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