Refrigeration system having dual compressors and either a single evaporator or dual evaporators

A refrigeration system comprising:

• a high-stage compressor;
• a low-stage compressor;
• a condenser for receiving a refrigerant gas from at least one of the high-stage compressor and the low-stage compressor and condensing the refrigerant gas to a refrigerant liquid;
• a first heat exchanger for receiving the refrigerant liquid from the condenser;
• a flash chamber for receiving a mixture of the refrigerant gas and the refrigerant liquid from the first heat exchanger, wherein the flash chamber separates the refrigerant gas from the refrigerant liquid and provides the refrigerant gas to the low-stage compressor;
• a second heat exchanger for receiving the refrigerant liquid from the flash chamber;
• and
• an evaporator for receiving the refrigerant liquid from the second heat exchanger and evaporating the refrigerant liquid to form the refrigerant gas that is supplied to the high-stage compressor.

A refrigeration system comprising:

• a first compressor;
• a second compressor;
• a condenser for receiving refrigerant gas from at least one of the first compressor and the second compressor and condensing the refrigerant gas to a refrigerant liquid;
• a high-stage first capillary for receiving the refrigerant liquid from the condenser;
• a first evaporator for receiving the refrigerant liquid from the high-stage capillary;
• a flash chamber for receiving a mixture of the refrigerant gas and the refrigerant liquid from the first evaporator, wherein the flash chamber separates the refrigerant gas from the refrigerant liquid and provides the refrigerant gas to the second compressor;
• a low-stage second capillary for receiving the refrigerant liquid from the flash chamber;
• and
• a second evaporator for receiving the refrigerant liquid from the low-stage capillary and evaporating the refrigerant liquid to form the refrigerant gas that is supplied to the first compressor.