Refrigeration system using separate subcooling loop with heat-carrying refrigerant

Abstract

A refrigeration system, having a main loop operating with a first refrigerant and including a first heat exchanger unit connected between a compressor unit and an expansion unit upstream of an evaporation unit, includes a subcooling loop. The subcooling loop has a second refrigerant circulating therein via a pump unit and connects to the first heat exchanger unit to heat-up the second refrigerant. The subcooling loop runs to an air circulation unit located downstream the first heat exchanger unit to cool down the second refrigerant and warm-up air flowing into the air circulation unit.

1 . A refrigeration system having a main loop operating with a first refrigerant and including a first heat exchanger unit connected between a compressor unit and an expansion unit upstream of an evaporation unit, the system comprising:
 a subcooling loop having a second refrigerant circulating therein using a pump unit and connecting to the first heat exchanger unit to heat-up the second refrigerant, the subcooling loop running to an air circulation unit located downstream the first heat exchanger unit to cool down the second refrigerant and warm-up air flowing into the air circulation unit.   
     
     
         2 . The system of  claim 1 , wherein the main loop further including a main heat exchanger unit and valve units located between the compressor unit and the expansion unit, the valve units selectively connecting the main heat exchanger unit downstream of the first heat exchanger unit to desuperheat the first refrigerant before being cooled down using the main heat exchanger unit, the valve units further allowing to selectively connect the main heat exchanger unit upstream of the first heat exchanger unit to enable the first heat exchanger unit subcooling down the first refrigerant. 
     
     
         3 . The system of  claim 1 , wherein the subcooling loop further including a second heat exchanger unit and valve units, the valve units selectively connecting the second heat exchanger unit downstream of the air circulation unit and upstream of the first heat exchanger to desuperheat the second refrigerant before being cooled down using the second heat exchanger unit, the valve units further allowing to selectively connect the second heat exchanger unit upstream of the air circulation unit to enable the air circulation unit further cooling down the second refrigerant before reaching the first heat exchanger unit to subcool the first refrigerant.