Importance

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Abstract

A refrigeration system disposed within an outer cabinet having a freezer compartment and a fresh food compartment comprises a freezer evaporator and a fresh food evaporator each having an inlet and an outlet. A compressor is coupled to the freezer evaporator via a conduit and a control valve is disposed at the inlet of the freezer evaporator to control refrigerant flow therethrough. A first liquid line temperature sensor is disposed so as to detect refrigerant temperature at the inlet of the freezer evaporator and a second liquid line temperature sensor is disposed so as to detect refrigerant temperature at the inlet of the fresh food evaporator. A freezer compartment temperature sensor and a fresh food compartment temperature sensor are disposed within the freezer compartment and the fresh food compartment, respectively, to sense compartment a temperatures. A controller is coupled to the control valve and to the compressor so as to provide control signals thereto and to the liquid line temperature sensors and the compartment temperature sensors to receive temperature signals therefrom. The controller generates control signals to the control valve in response to temperature signals generated from the liquid line temperature sensors and the compartment temperature sensors to modify the control valves duty cycle of open-to-closed conditions so as to maintain evaporator dryness at a relatively fixed level.

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First Claim