Device and method for providing additional head to support a refrigeration liquid feed system

Abstract

The disclosure relates to a refrigerant device and a method for providing additional head to support a refrigeration liquid feed system. The refrigerating device comprises a refrigerant liquid container, a sinking conduit and a rising conduit, the sinking conduit extending downwardly to a connection with the rising conduit, the rising conduit extending upwardly from the connection with the sinking conduit. The refrigerating device further comprises an evaporator having an inlet connected downstream to the rising conduit and an outlet connected to the refrigerant liquid container via a return conduit, and a gas injector connected to the rising conduit, adapted to supply gas in order to allow gas to rise together with liquid refrigerant in the rising conduit, thereby reducing the total density of the mixture of liquid refrigerant and gas relative the density of liquid refrigerant.

1 . A refrigerating device comprising:
 a refrigerant liquid container,   a sinking conduit and a rising conduit, the sinking conduit extending downwardly to a connection with the rising conduit, the rising conduit extending upwardly from the connection with the sinking conduit,   an evaporator having an inlet connected downstream to the rising conduit and an outlet connected to the refrigerant liquid container via a return conduit, and   a gas injector connected to the rising conduit, adapted to supply gas in order to allow gas to rise together with liquid refrigerant in the rising conduit, thereby reducing the total density of the mixture of liquid refrigerant and gas relative the density of liquid refrigerant.   
     
     
         2 . The refrigerating device according to  claim 1 , further comprising a gas liquid separator arranged downstream the rising conduit and upstream the evaporator. 
     
     
         3 . The refrigerating device according to  claim 2 , further comprising a pressure regulating device connected to the gas liquid separator to allow flow of gas from the gas liquid separator and to regulate the pressure in the gas liquid separator. 
     
     
         4 . The refrigerating device according to  claim 2 , adapted to recirculate the gas from the gas liquid separator to the return conduit or to the refrigerant liquid container. 
     
     
         5 . The refrigerating device according to  claim 2 , adapted to recirculate the gas from the gas liquid separator to the gas injector. 
     
     
         6 . The refrigerating device according to  claim 1 , wherein the refrigerant liquid container comprises a gas vent. 
     
     
         7 . The refrigerating device according to  claim 1 , wherein the gas injector, is adapted to supply pressurized gas. 
     
     
         8 . The refrigerating device according to  claim 7 , further comprising a connection to a source of externally pressurized gas. 
     
     
         9 . The refrigerating device according to  claim 1 , wherein the gas is refrigerant vapor. 
     
     
         10 . The refrigerating device according to  claim 1 , wherein the gas is air. 
     
     
         11 . A method for circulating a refrigerant liquid in a refrigerating device, said method comprising:
 conducting a flow of refrigerant liquid from a refrigerant liquid container via a sinking conduit, a rising conduit, an evaporator and a return conduit back to the refrigerant liquid container, and   supplying gas via a gas injector connected to the rising conduit in order to allow gas to rise together with refrigerant liquid in the rising conduit, thereby reducing the total density of the mixture of refrigerant liquid and gas relative the density of refrigerant liquid.   
     
     
         12 . The method according to  claim 11 , further comprising separating the supplied gas from the refrigerant liquid at a gas liquid separator located upstream to the evaporator. 
     
     
         13 . The method according to  claim 12 , further comprising regulating the pressure in the gas liquid separator by means of a pressure regulating device. 
     
     
         14 . The method according to  claim 13 , further comprising recirculating the gas from the gas liquid separator to the return conduit or to the refrigerant liquid container. 
     
     
         15 . The method according to  claim 11 , further comprising pressurizing the gas before supplying the gas via the gas injector. 
     
     
         16 . The method according to  claim 11 , wherein the gas is refrigerant vapor. 
     
     
         17 . The method according to  claim 11 , further comprising venting refrigerant vapor from the liquid refrigerant container and supplying the vented refrigerant vapor to the gas injector. 
     
     
         18 . The refrigerating device according to  claim 3 , adapted to recirculate the gas from the gas liquid separator to the return conduit or to the refrigerant liquid container. 
     
     
         19 . The refrigerating device according to  claim 3 , adapted to recirculate the gas from the gas liquid separator to the gas injector. 
     
     
         20 . The refrigerating device according to  claim 4 , adapted to recirculate the gas from the gas liquid separator to the gas injector.