Low GWP heat transfer compositions containing difluoromethane, a fluorinated ethane and 1,3,3,3-tetrafluoropropene
View Patent ↗Heat transfer compositions, methods and use wherein the composition comprising: (a) from about 5 to about 20% by weight of HFC-32; (b) from about 70% to about 90% by weight of HFO-1234ze; and (c) from about 5% to less than about 20% by weight of HFC-152a and/or HFC-134a.
1. A heat transfer composition comprising: (a) from about 85% and about 86% of HFO-1234ze; (b) from about 9.5% and about 10.5% by weight of HFC-32; (c) from about 5 to less than about 20% by weight of HFC-152a; and (d) HFC-134a in an amount of about 4.5% by weight, said composition having a hazard value of less than 7.
2. The heat transfer composition of claim 1 wherein said composition has a GWP of not greater than 150.
3. The heat transfer composition of claim 1 wherein said composition has a GWP of not greater than 100.
4. The heat transfer composition of claim 1 wherein said composition has a hazard value of about 5 or less.
5. The heat transfer composition of claim 1 wherein said composition has a hazard value of less than about 4.
6. The heat transfer composition of claim 1 wherein said composition has a hazard value of not greater than about 2.
7. The heat transfer composition of claim 1 wherein said composition has a burning velocity of less than 10.
8. The heat transfer composition of claim 1 wherein said composition has a capacity relative to HFC-134a under MAC conditions of from about 90% to about 105%.
9. The heat transfer composition of claim 1 wherein said composition has a capacity relative to HFC-134a under MAC conditions of from about 95% to about 101%.
10. The heat transfer composition of claim 1 wherein said composition has a COP relative to HFC134a under MAC conditions of from about 98% to about 102%.
11. The heat transfer composition of claim 1 wherein said composition has a COP relative to HFC134a under MAC conditions of from about 100%.
12. The heat transfer composition of claim 1 wherein said HFO-1234ze consists essentially of trans-HFO1234ze.
13. An air conditioning system comprising a heat transfer composition according to claim 1 .
14. A mobile air conditioning system comprising a heat transfer composition according to claim 1 .
15. An air conditioning system in a passenger car or for the passenger compartment of a truck comprising a heat transfer composition according to claim 1 .
16. The heat transfer composition of claim 1 wherein said composition has an Evaporator Glide of not greater than about 8.
17. The heat transfer composition of claim 1 wherein said composition has an Evaporator Glide of not greater than about 7.