Lubricant return schemes for use in refrigerant cycle

Details Lubricant return schemes for use in refrigerant cycle Lubricant return schemes for use in refrigerant cycle

2006-09-12

2006-09-12

Ali, Mohammad M. (Department: 3744)

Refrigeration

Processes

Lubricant handling

C062S470000

Reexamination Certificate

active

07104076

ABSTRACT:
A control algorithm is developed which takes corrective action in the event that system conditions indicate there may be an inadequate flow of lubricant in the system. In particular, if a discharge pressure is below a predetermined amount or if the suction modulation valve is throttled, there is a possibility of inadequate lubricant flow. The system control then turns off the condenser fan, and if that first step is not sufficient, may also turn on an evaporator heater and then control a suction modulation valve. A fail safe control loop also takes effect if the condition sensor appears to have failed.

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International Search Report, Sep. 12, 2005.

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