Patent ID: 6438978
Filing Date: 2002-08-27
Classification: F25B,F25D,Y02B

Abstract:
A method of refrigeration control comprising the following method steps:monitoring temperatures of a fresh food compartment and a freezer compartment and comparing said compartment temperatures with preset compartment temperatures; energizing a fresh food compartment fan when said fresh food compartment temperature is greater than said preset compartment temperature; energizing a freezer compartment fan when said freezer compartment temperature is greater than said preset compartment temperature; de-energizing said fresh food compartment fan when said fresh food compartment temperature is less than or equal to said preset compartment temperature; de-energizing said freezer compartment fan when said freezer compartment temperature is less than or equal to said preset compartment temperature determining whether each respective compartment fan is currently energized; setting the flow rate of a control valve disposed at an inlet of a freezer evaporator for a fixed (T1âˆ’T2) delta if said freezer compartment fan is energized and said fresh food fan deenergized, or if said fresh food compartment fan is energized after said freezer compartment fan is energized; and setting the flow rate of said control valve for a fixed (T3âˆ’T4) delta if said fresh food compartment fan is energized and said freezer compartment fan is deenergized or if said freezer compartment fan is energized after said fresh food compartment fan is energized; wherein T1 is a freezer compartment temperature, T2 is a refrigerant temperature at the inlet of said freezer evaporator, T3 is a fresh food compartment temperature, and T4 is a refrigerant temperature at the inlet of a fresh food evaporator.