Patent ID: 7574869

Claim:
A refrigeration system comprising: a plurality of refrigerated display cases, each of the plurality of refrigerated display cases including a dedicated evaporator configured to cool return air from the respective refrigerated display case by at least partially evaporating a refrigerant; a compressor assembly in fluid communication with the plurality of evaporators and configured to compress evaporated refrigerant from the plurality of evaporators; a condenser located remotely from the plurality of refrigerated display cases and configured to reject heat from the refrigerant to an environment, the condenser including an inlet and an outlet; a gas main in fluid communication with the inlet and configured to direct refrigerant from the compressor assembly to the condenser; a liquid main in fluid communication with the outlet and configured to direct refrigerant from the condenser to the plurality of evaporators; and a valve fluidly coupled between the gas main and the liquid main and including at least one sensor configured to measure the superheat of refrigerant in the gas main, the valve configured to regulate flow of the refrigerant from the gas main to the liquid main based on the superheat of refrigerant in the gas main.