COMBINED REFRIGERATION SYSTEM WITH A LIQUID PRE-COOLING HEAT EXCHANGER

摘要

A compressor-pump unit (20) for use in a vapor-compression refrigeration system (10) is provided. The compressor-pump unit (20) comprises a driving device (24) including a rotatable shaft (42). A compressor (26) is coupled with a first portion (43) of the shaft (42) for compressing gaseous refrigerant within the vapor-compression refrigeration system (10). A liquid pump (21) is coupled with a second portion (44) of the shaft (42) for receiving liquid refrigerant having a first pressure and for discharging the received liquid refrigerant at a second pressure with the second pressure being higher than the first pressure by a predetermined amount such that the discharged liquid refrigerant is subcooled. A pre-cooling circuit is connected to the liquid pump (22) with the pre-cooling circuit being exposed to the gaseous refrigerant whereby the gaseous refrigerant absorbs heat from the liquid refrigerant, prior to the liquid refrigerant entering the liquid pump (21).