Patent ID: 7913506

Claim:
A refrigeration system, comprising: a plurality of medium temperature compact chiller units arranged in parallel and configured to cool a medium temperature liquid coolant for circulation to a plurality of medium temperature refrigerated display cases; a plurality of low temperature compact chiller units arranged in parallel and configured to cool a low temperature liquid coolant for circulation to a plurality of low temperature refrigerated display cases; a coolant supply header configured to supply a coolant to the low and medium temperature compact chiller units; a coolant suction header configured to receive the coolant from the low and medium temperature compact chiller units; a fluid cooler configured to cool the coolant in the coolant supply header; a cascade heat exchanger configured to receive a supply of the medium temperature liquid coolant from the medium temperature compact chiller units; at least one first pump configured to pump the coolant from the coolant suction header to the coolant supply header and through the fluid cooler; at least one second pump configured to pump the coolant from the coolant suction header to the coolant supply header and through the cascade heat exchanger; a valve disposed on the coolant supply header between the low temperature compact chiller units and the fluid cooler, the valve movable to a closed position to define a first cooling flow path comprising the first pump and the fluid cooler and the medium temperature modular chiller units, and a second cooling flow path comprising the second pump and the cascade heat exchanger and the low temperature compact chiller units.