Sequential hot gas defrost method and apparatus

Details Sequential hot gas defrost method and apparatus Sequential hot gas defrost method and apparatus

2005-11-28

2008-12-09

Norman, Marc E (Department: 3744)

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

C062S081000, C062S200000, C062S278000, C137S315330, C137S511000, C251S336000

Reexamination Certificate

active

07461515

ABSTRACT:
The present invention provides a method and apparatus for using hot gas to defrost sequentially each refrigerated display case (evaporator) in a group of refrigerated display cases (evaporators). A unique cross-feed line connects the distributor and the evaporator suction line for each evaporator in the group of evaporators. Like a typical hot gas defrost system, the sequential hot gas defrost system may be time-initiated and time-terminated or time-initiated and temperature-terminated. Each evaporator in the group of evaporators is defrosted in turn while the remaining evaporators in the group continue to operate in the refrigeration mode. A unitary combination check valve and orifice simplifies the sequential hot gas defrost refrigeration system.

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