Low-temperature and average-temperature refrigeration

Abstract

Binary compositions of 2,3,3,3-tetrafluoropropene and difluoromethane, as a heat transfer fluid in compression, low-temperature and average temperature refrigeration systems, with exchangers operating in counterflow mode or in split flow mode with counterflow tendency. Also, to a heat transfer method. The binary compositions can replace R-404A and R-407C (ternary mixture containing 52 wt. % of HFC-134a, 25 wt. % of pentafluoroethane and 23 wt. % of difluoromethane) in compression-type heat-transfer systems with exchangers operating in countercurrent mode or in crossed-current mode with countercurrent tendency.

1 . The use of a binary composition containing 2,3,3,3-tetrafluoropropene and difluoromethane as heat transfer fluid in compression-type, low- and medium-temperature refrigeration systems, with exchangers operating in countercurrent mode or in crossed-current mode with countercurrent tendency. 
     
     
         2 . The use as claimed in  claim 1 , characterized in that the composition contains essentially from 61 to 85 wt. % of 2,3,3,3-tetrafluoropropene and from 15 to 39 wt. % of difluoromethane. 
     
     
         3 . The use as claimed in  claim 1 , characterized in that the composition contains essentially from 70 to 79 wt. % of 2,3,3,3-tetrafluoropropene and from 21 to 30 wt. % of difluoromethane. 
     
     
         4 . A method of heat transfer in which a binary composition containing 2,3,3,3-tetrafluoropropene and difluoromethane is used as refrigerant in compression-type low- and medium-temperature refrigeration systems, with exchangers operating in countercurrent mode or in crossed-current mode with countercurrent tendency. 
     
     
         5 . The method as claimed in  claim 4 , characterized in that the composition contains essentially from 61 to 85 wt. % of 2,3,3,3-tetrafluoropropene and from 15 to 39 wt. % of difluoromethane. 
     
     
         6 . The method as claimed in  claim 4 , characterized in that the composition contains essentially from 70 to 79 wt. % of 2,3,3,3-tetrafluoropropene and from 21 to 30 wt. % of difluoromethane. 
     
     
         7 . The method as claimed in  claim 4 , characterized in that the binary composition is stabilized. 
     
     
         8 . The method as claimed in  claim 4 , characterized in that it is implemented in the presence of a lubricant.