CASCADE REFRIGERATION SYSTEM MOUNTED WITHIN A DECK

摘要

A refrigeration system (20) is provided for use with an ultra-low temperature freezer (10) having a deck (14) and a refrigerated cabinet (16) supported above the deck (14). The system (20) has a first refrigeration stage (24) and a second refrigeration stage (26). The first stage (24) defines a first fluid circuit for circulating a first refrigerant (34). The first stage (24) has a first compressor (50), a condenser (54) and a first expansion device (58) that is in fluid communication with the first fluid circuit. The second stage (26) defines a second fluid circuit for circulating a second refrigerant (36). The second stage (26) has a second compressor (70), a second expansion device (74) and an evaporator (78) that is in fluid communication with the second fluid circuit. The system (20) includes an insulated enclosure (150) supported within the deck (14) and a split-flow heat exchanger (44) that is in fluid communication with the first and second fluid circuits and which is located within the insulated enclosure (150).