Patent ID: 8631666
Filing Date: 2014-01-21
Classification: F25B

Abstract:
1. A refrigeration system, comprising: a plurality of modular medium temperature chiller units each having a first medium temperature heat exchanger and a second medium temperature heat exchanger, the modular medium temperature chiller units arranged in parallel and configured to circulate a medium temperature refrigerant through the first and second medium temperature heat exchangers to cool a medium temperature liquid coolant for circulation to a plurality of medium temperature refrigeration loads; a plurality of modular low temperature condenser units each having a first low temperature heat exchanger and a second low temperature heat exchanger, the modular low temperature condenser units arranged in parallel, with the second low temperature heat exchanger configured to receive the medium temperature liquid coolant to condense a low temperature refrigerant for circulation to the first low temperature heat exchanger to condense a vapor CO2 refrigerant to a liquid CO2 refrigerant; a liquid vapor separator disposed separately from, and communicating with, the modular low temperature condenser units to direct vapor CO2 refrigerant to the first low temperature heat exchanger and to receive liquid CO2 refrigerant directly from the first low temperature heat exchanger; a pump configured to direct the liquid CO2 refrigerant from the liquid-vapor separator to a plurality of low temperature refrigeration loads.