Discharge pressure control system for transport refrigeration unit using suction modulation
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United States of America Patent
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Jun 1, 1999
Grant Date -
N/A
app pub date -
Dec 23, 1997
filing date -
Dec 23, 1997
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A compressor discharge pressure control system employed on a container refrigeration unit utilizes a pressure transducer located in the high pressure side of the system and a data processor to control and limit the compressor discharge pressure to a maximum value when the normal condenser pressure controls are inactive. The pressure control system operates the suction modulation valve in a manner that significantly reduces compressor cycling and increases refrigeration system capacity during pull-down periods. The pressure control system also operates during water-cooled operation of a refrigeration system having a water-cooled condenser thereby eliminating the need to provide a water pressure switch in the refrigeration system.
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