Heat transfer compositions

Abstract

A heat transfer composition includes:(i) trans-1,3,3,3-tetrafluoropropene (R-1234ze(E));(ii) a second component selected from difluoromethane (R-32), propene (R-1270), propane (R290) and mixtures thereof;(iii) a third component selected from pentafluoroethane (R-125), 1,1,1,2-tetraflueroethane (R-34a), and mixtures thereof; and optionally(iv) a fourth component selected from fluoroethane (R-161), 1,1-difluoroethane (R-152a) and mixtures thereof.

I/We claim: 
     
         1 . A heat transfer composition comprising:
 (i) trans-1,3,3,3-tetrafluoropropene (R-1234ze(E));   (ii) a second component selected from difluoromethane (R-32), propene (R-1270), propane (R290) and mixtures thereof;   (iii) a third component selected from pentafluoroethane (R-125), 1,1,1,2-tetrafluoroethane (R-34a), and mixtures thereof; and optionally   (iv) a fourth component selected from fluoroethane (R-161), 1,1-difluoroethane (R-152a) and mixtures thereof.   
     
     
         2 . A composition according to  claim 1 , comprising from about 5 to about 50% by weight of R-1234ze(E). 
     
     
         3 . A composition according to  claim 1 , comprising from about 10 to about 40% by weight of the second component. 
     
     
         4 . A composition according to  claim 1 , comprising from about 10 to about 80% by weight of the third component. 
     
     
         5 . A composition according to  claim 1 , wherein the second component comprises R-32. 
     
     
         6 . A composition according to  claim 1 , wherein the third component is R-125 and R-134a. 
     
     
         7 . A composition according to  claim 1 , comprsing R-161 as the fourth component. 
     
     
         8 . A composition according to  claim 7 , comprising R-1234ze(E), R-32, R-134a and R-161. 
     
     
         9 . A composition according to  claim 8 , comprising from about 5 to about 60% by weight R-1234ze(E), from about 20 to about 50% by weight R-32, from about 10 to about 60% by weight R-161, and from about 10 to about 40% by weight R-134a. 
     
     
         10 . A composition according to  claim 9 , comprising from about 30 to about 60% by weight P-1234ze(E), from about 20 to about 50% by weight R-32, from about 10 to about 30% by weight R-161, and from about 10 to about 25% by weight R-134a. 
     
     
         11 . A composition according to  claim 7 , comprising R-1234ze(E), R-32, R-125 and R-161. 
     
     
         12 . A composition according to  claim 11 , comprising from about 0 to about 65% by weight R-1234ze(E), from about 15 to about 40% by weight R-32, from about 10 to about 30% by weight R-161, and from about 10 to about 25% by weight R-125. 
     
     
         13 . A composition according to  claim 12 , comprising from about 25 to about 60% by weight R-1234ze(E), from about 20 to about 40% by weight R-32, from about 10 to about 20% by weight R-161, and from about 10 to about 25% by weight R-125. 
     
     
         14 . A composition according to  claim 1 , wherein the composition has a GWP of less than 2800, preferably less than 1500. 
     
     
         15 . A composition according to  claim 1 , wherein the temperature glide is less than about 15k, preferably less than about 10k. 
     
     
         16 . A composition according to  claim 1 , wherein the composition has a volumetric refrigeration capacity within about 15%, preferably within about 10% of the existing refrigerant that it is intended to replace. 
     
     
         17 . A composition according to  claim 1 , wherein the composition is less flammable than R-32 alone. 
     
     
         18 . A composition according to  claim 17 , wherein the composition has:
 (a) a higher flammable limit;   (b) a higher ignition energy; and/or   (c) a lower flame velocity compared to R-32 alone.   
     
     
         19 . A composition according to  claim 1 , wherein the composition has a cycle efficiency within about 10% of the existing refrigerant that it is intended to replace. 
     
     
         20 . A composition according to  claim 1 , wherein the composition has a compressor discharge temperature within about 15k, of the existing refrigerant that it is intended to replace.