Compositions containing difluoromethane and fluorine substituted olefins
Compositions comprising multi-fluorinated olefins and HFC-32 are disclosed. Such compositions are useful particularly for in stationary refrigeration and air conditioning equipment.
1. A method of cooling to provide refrigeration comprising:
(a) providing an R404A low temperature refrigeration system or an R404A medium temperature refrigeration system comprising an evaporator; and
(b) evaporating in said evaporator a refrigerant consisting essentially of:
(i) from 20% to 30% by weight of R-32; and
(ii) from 70% to 80% by weight of 1234yf,
wherein said refrigerant has: (1) a GWP of 150 or less; and (2) a temperature glide in said evaporator of about 7° C. or less, and wherein said system with said refrigerant has a capacity of from about 85% to less than 110% relative to the capacity of the system operating with R-404A.
2. The method of claim 1 wherein said providing step comprises providing, with or without modification, a low temperature refrigeration system designed for use with R404A.
3. The method of claim 1 wherein said providing step comprises providing a low temperature refrigeration system and wherein said refrigerant has a temperature glide in said evaporator of about 5° C. or less.
4. The method of claim 3 wherein said low temperature refrigeration system with said refrigerant operates with a capacity of about 88% to about 104% relative to the capacity of said system operating with R404A.
5. The method of claim 3 wherein said providing step comprises providing a low temperature refrigeration system and wherein said low temperature refrigeration system with said refrigerant operates with a COP of about 109% relative to the COP of said system operating with R404A.
6. The method of claim 4 wherein said providing step comprises providing a low temperature refrigeration system and wherein said low temperature refrigeration system with said refrigerant operates with a COP of about 109% relative to the COP of said system operating with R404A.
7. The method of claim 1 wherein said providing step comprises providing, with or without modification, a medium temperature refrigeration system designed for use with R404A.
8. The method of claim 1 wherein said providing step comprises providing a medium temperature refrigeration system.
9. The method of claim 1 wherein said refrigerant consists essentially of:
(i) about 20% by weight of difluoromethane (R-32); and
(ii) about 80% weight percent of 1,1,1,2-tetrafluoropropene (HFO-1234yf).
10. The method of claim 9 wherein said providing step comprises providing, with or without modification, a low temperature refrigeration system designed for use with R404A.
11. The method of claim 9 wherein said providing step comprises providing a low temperature refrigeration system.
12. The method of claim 11 wherein said low temperature refrigeration system with said refrigerant operates with a capacity of about 88% relative to the capacity of said system operating with R404A.
13. The method of claim 11 wherein said low temperature refrigeration system with said refrigerant operates with a COP of about 109% relative to the COP of said system operating with R404A.
14. The method of claim 12 wherein said low temperature refrigeration system with said refrigerant operates with a COP of about 109% relative to the COP of said system operating with R404A.
15. The method of claim 9 wherein said providing step comprises providing, with or without modification, a medium temperature refrigeration system designed for use with R404A.
16. The method of claim 9 wherein said providing step comprises providing a medium temperature refrigeration system.
17. A system to replace R404A in a low temperature refrigeration system or in a medium temperature refrigeration system comprising:
(a) providing an R404A low temperature refrigeration system or an R404A medium temperature refrigeration system comprising a compressor, a condenser and an evaporator; and
(b) said low temperature refrigeration system or said medium temperature refrigeration system comprising a refrigerant consisting essentially of:
(i) from 20% to 30% by weight of R-32; and
(ii) from 70% to 80% by weight of 1234yf,
wherein said refrigerant has: (1) a GWP of 150 or less; and (2) a temperature glide in said evaporator of about 7° C. or less, and wherein said system with said refrigerant has a capacity of from about 85% to less than 110% relative to the capacity the system operating with R-404A.
18. The system of claim 17 wherein said system is a low temperature refrigeration system designed for use with R404A or a medium temperature refrigeration system designed for use with R404A.
19. The system of claim 17 wherein said system is a low temperature refrigeration system which is designed for use with R404A and which is modified.
20. The system of claim 17 wherein said system is a low temperature refrigeration system which is designed for use with R404A and which is not modified.
21. The system of claim 19 wherein said system with said refrigerant operates with a capacity of about 88% to about 104% relative to the capacity of said system operating with R404A.
22. The system of claim 19 wherein said system with said refrigerant operates with a COP of about 109% relative to the COP of said system operating with R404A.
23. The system of claim 21 wherein said system with said refrigerant operates with a COP of about 109% relative to the COP of said system operating with R404A.
24. The system of claim 17 wherein said system is a medium temperature refrigeration system.
25. The system of claim 19 wherein said refrigerant consists essentially of:
(i) about 20% by weight of difluoromethane (R-32); and
(ii) about 80% weight percent of 1,1,1,2-tetrafluoropropene (HFO-1234yf).
26. The system of claim 25 wherein said system is a low temperature refrigeration system.
27. The system of claim 26 wherein said system with said refrigerant operates with a capacity of about 88% relative to the capacity of said system operating with R404A.
28. The system of claim 27 wherein said system with said refrigerant operates with a COP of about 109% relative to the COP of said system operating with R404A.
29. The system of claim 26 wherein said system with said refrigerant operates with a COP of about 109% relative to the COP of said system operating with R404A.
30. The system of claim 24 wherein said system is a medium temperature refrigeration system designed for use with R404A.