Patent ID: 6202425
Filing Date: 2001-03-20
Classification: A47F,F25B,F25D

Abstract:
In a commercial refrigeration system, including a primary refrigeration system having a compressor system for compressing and delivering coolant through a primary condenser, through a delivery conduit to the vicinity of a space that is to be refrigerated, an expansion valve for expanding the coolant from a liquid into a gas, a primary evaporator for receiving the coolant from the expansion valve and a return conduit or returning the coolant in a gaseous form from the primary evaporator to the compressor system for re-compression, the improvement therein comprising:a non-compression cascade refrigeration system in heat exchange relationship with said primary refrigeration system, said cascade refrigeration system comprising:a cascade condenser in heat exchange relationship with said primary evaporator;a cascade evaporator positioned in the refrigerated space;a liquid and vapor separator;a first coolant delivery conduit constructed and arranged to deliver coolant from said cascade condenser to said separator;a second coolant delivery conduit constructed and arranged to deliver coolant from said separator to said cascade evaporator in the refrigerated space;a first coolant return conduit constructed and arranged to return coolant from said cascade evaporator to said separator;a second coolant return conduit constructed and arranged to return coolant from said separator to said cascade condensing chamber; andsaid separator including means for separating liquid coolant from gaseous coolant and directing gaseous coolant to said second coolant return conduit and to said cascade condenser and directing liquid coolant to said second delivery conduit and to said cascade evaporator.