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 a fluid comprising:
providing, with or without modification, a low temperature refrigeration or a medium temperature refrigeration system comprising an evaporator and a condenser, said system designed to cool a fluid using R-404A;
evaporating in said evaporator and condensing in said condenser a refrigerant consisting essentially of:
(a) about 65% by weight of 1234yf; and
(b) about 35% by weight of R-32,
wherein said refrigerant has a temperature glide in said evaporator and in said condenser of about 5° C. or less and wherein said low temperature refrigeration system or said medium temperature refrigeration system with said refrigerant has a capacity of from about 90% to less than about 110% relative to the capacity of the system with R-404A.
2. The method of claim 1 wherein said refrigerant consists of:
(a) about 65% by weight of 1234yf; and
(b) about 35% by weight of R-32.
3. The method of claim 1 wherein said heat transfer system is a low temperature refrigeration system.
4. The method of claim 1 wherein said heat transfer system is a medium temperature refrigeration system.
5. The method of claim 3 wherein said refrigerant consists of:
(i) about 35% by weight of difluoromethane (R-32); and
(ii) about 65% by weight of 1,1,1,2-tetrafluoropropene (HFO-1234yf).
6. The method of claim 4 wherein said refrigerant consists of:
(i) about 35% by weight of difluoromethane (R-32); and
(ii) about 65% by weight of 1,1,1,2-tetrafluoropropene (HFO-1234yf).
7. A heat transfer system comprising:
(a) a low temperature refrigeration system or a medium temperature refrigeration system comprising an evaporator and a condenser, said system designed to cool a fluid using R-404A; and
(b) a refrigerant in said evaporator and in said condenser and consisting essentially of:
(i) about 35% by weight of difluoromethane (R-32); and
(ii) about 65% by weight of 1,1,1,2-tetrafluoropropene (HFO-1234yf) wherein said system is in operation and said refrigerant has a temperature glide in said evaporator of about 5° C. or less and wherein said low temperature refrigeration system or said medium temperature refrigeration system with said refrigerant has a capacity of from about 90% to less than about 110% relative to the capacity of the system with R-404A.
8. The heat transfer system of claim 7 wherein said heat transfer system is a low temperature refrigeration system.
9. The heat transfer system of claim 8 wherein said refrigerant consists of:
(i) about 35% by weight of difluoromethane (R-32); and
(ii) about 65% by weight of 1,1,1,2-tetrafluoropropene (HFO-1234yf).
10. The heat transfer system of claim 7 wherein said heat transfer system is a medium temperature refrigeration system.
11. The heat transfer system of claim 10 wherein said refrigerant consists of:
(i) about 35% by weight of difluoromethane (R-32); and
(ii) about 65% by weight of 1,1,1,2-tetrafluoropropene (HFO-1234yf).
12. A method of cooling air comprising:
providing a low temperature refrigeration system or a medium temperature refrigeration system comprising an evaporator and a condenser, said system designed to cool air using R-404A;
evaporating in said evaporator and condensing in said condenser a refrigerant consisting essentially of:
(a) about 65% by weight of 1234yf; and
(b) about 35% by weight of R-32,
wherein said refrigerant has a temperature glide in said evaporator and in said condenser of about 5° C. or less and wherein said low temperature refrigeration system or said medium temperature refrigeration system with said refrigerant has a capacity of from about 90% to less than about 110% relative to the capacity of R404A in the system.
13. The method of claim 12 wherein said refrigerant consists of:
(a) about 65% by weight of 1234yf; and
(b) about 35% by weight of R-32.
14. The method of claim 12 wherein said heat transfer system is a low temperature refrigeration system.
15. The method of claim 12 wherein said heat transfer system is a medium temperature refrigeration system.
16. The method of claim 14 wherein said refrigerant consists of:
(i) about 35% by weight of difluoromethane (R-32); and
(ii) about 65% by weight of 1,1,1,2-tetrafluoropropene (HFO-1234yf).
17. The method of claim 15 wherein said refrigerant consists of:
(i) about 35% by weight of difluoromethane (R-32); and
(ii) about 65% by weight of 1,1,1,2-tetrafluoropropene (HFO-1234yf).
18. A method of replacing R-404a in low or medium temperature refrigeration system comprising:
providing a low temperature refrigeration system or a medium temperature refrigeration system comprising an evaporator and a condenser, said system designed to cool air using R-404A;
removing said R-404A from said low temperature refrigeration system or said medium temperature refrigeration system;
adding to said low temperature refrigeration system or said medium temperature refrigeration system a refrigerant consisting essentially of:
(a) about 65% by weight of 1234yf; and
(b) about 35% by weight of R-32; and
evaporating in said evaporator and condensing in said condenser said refrigerant,
wherein said refrigerant has a temperature glide in said evaporator and in said condenser of about 5° C. or less and wherein said low temperature refrigeration system or said medium temperature refrigeration system with said refrigerant has a capacity of from about 90% to less than about 110% relative to the capacity of the system with R-404A.
19. The method of claim 18 wherein said refrigerant consists of:
(i) about 35% by weight of difluoromethane (R-32); and
(ii) about 65% by weight of 1,1,1,2-tetrafluoropropene (HFO-1234yf).
20. The method of claim 18 wherein said heat transfer system is a low temperature refrigeration system.
21. The method of claim 20 wherein said refrigerant consists of:
(i) about 35% by weight of difluoromethane (R-32); and
(ii) about 65% by weight of 1,1,1,2-tetrafluoropropene (HFO-1234yf).
22. The method of claim 18 wherein said heat transfer system is a medium temperature refrigeration system.
23. The method of claim 22 wherein said refrigerant consists of:
(i) about 35% by weight of difluoromethane (R-32); and
(ii) about 65% by weight of 1,1,1,2-tetrafluoropropene (HFO-1234yf).