Refrigerant cycle with defrost termination control

Details Refrigerant cycle with defrost termination control Refrigerant cycle with defrost termination control

2005-09-20

2005-09-20

Tanner, Harry B. (Department: 3744)

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

C062S222000, C062S234000, C062S276000

Reexamination Certificate

active

06945059

ABSTRACT:
A refrigerant cycle is provided with a transient mode for moving from a defrost cycle back to steady state operation. In particular, some default position of the expansion device is selected when defrost cycle ends. The evaporator is hot at the end of defrost cycle, and might otherwise suggest an increased flow of refrigerant through the expansion device, which could be undesirable. Thus, a control for the inventive system moves the expansion device to a defrost transient position, with the defrost transient position restricting the flow of refrigerant to a value that would be less than that dictated by the high temperature of the evaporator. At some period of time after the end of the defrost mode, the refrigerant cycle can be returned to state steady operation.

REFERENCES:
patent: 2492970 (1950-01-01), Curry
patent: 4850200 (1989-07-01), Sugiyama
patent: 5285646 (1994-02-01), TaeDuk
patent: 5479785 (1996-01-01), Novak
patent: 5842355 (1998-12-01), Kalis et al.

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