Defrost control method and apparatus

Details Defrost control method and apparatus Defrost control method and apparatus

1997-07-02

1998-09-29

Tanner, Harry B.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62211, 62223, 62225, F25B 4702

Patent

active

058132422

ABSTRACT:
A defrost control system comprises a superheat detector for detecting the degree of superheat of refrigerant leaving an evaporator or the presence of liquid in the refrigerant, a temperature sensor for sensing the temperature of a thermal load cooled by the evaporator and an electrically operable expansion valve for controlling the flow of refrigerant through the evaporator, each connected to a control circuit. In normal operation, the control circuit controls the flow of refrigerant to keep the temperature of the thermal load constant. However, if the superheat detector detects that the superheat is too low, the control circuit overrides the normal operation and reduces the flow of refrigerant. If the control circuit determines that the time spent in override condition over a period exceeds a maximum level, defrosting of the evaporator is triggered.

REFERENCES:
patent: 2432859 (1947-12-01), Carter
patent: 5046324 (1991-09-01), Otoh et al.
patent: 5551248 (1996-09-01), Derosier

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