Heat transfer compositions, methods and systems
The present invention relates to a refrigerant composition, including difluoromethane (HFC-32), pentafluoroethane (HFC-125), and trifluoroiodomethane (CF 3 I) for use in a heat exchange system, including air conditioning and refrigeration applications and in particular aspects to the use of such compositions as a replacement of the refrigerant R-410A for heating and cooling applications and to retrofitting heat exchange systems, including systems designed for use with R-410A.
1. A refrigerant consisting of:
about 49% by weight difluoromethane (HFC-32),
about 11.5% by weight pentafluoroethane (HFC-125), and
about 39.5% by weight trifluoroiodomethane (CF3I)
wherein the percentages are based on the total weight of said three compounds.
2. The refrigerant of claim 1 wherein said refrigerant is non-flammable.
3. A heat transfer composition comprising the refrigerant of claim 2 .
4. A heat transfer composition comprising the refrigerant of claim 2 and POE lubricant.
5. The refrigerant of claim 1 wherein said combination consists of:
49%+/−0.3% by weight of difluoromethane (HFC-32),
11.5%+/−0.3% by weight pentafluoroethane (HFC-125), and
39.5%+/−0.3% by weight trifluoroiodomethane (CF3I).
6. The refrigerant of claim 5 wherein said refrigerant is non-flammable.
7. A heat transfer composition comprising the refrigerant of claim 5 .
8. A heat transfer composition comprising the refrigerant of claim 5 and POE lubricant.
9. A method of cooling in a heat transfer system comprising an evaporator, a condenser and a compressor, the process comprising:
i) condensing a refrigerant consisting of:
about 49% by weight difluoromethane (HFC-32), about 11.5% by weight pentafluoroethane (HFC-125), and
about 39.5% by weight trifluoroiodomethane (CF3I), wherein the percentages are based on the total weight of said three compounds;
ii) evaporating said refrigerant in the vicinity of body or article to be cooled, wherein the evaporating temperature of said refrigerant is in the range of from about 40° C. to about 10° C.
10. The method of claim 9 wherein the evaporating temperature of said refrigerant is in the range of from about −20° C. to about 3° C.
11. The method of claim 9 wherein the evaporating temperature of said refrigerant is in the range of from about 0° C. to about 10° C.
12. The method of claim 9 wherein the evaporating temperature of said refrigerant is in the range of from about −12° C. to about 0° C.
13. The method of claim 9 wherein the evaporating temperature of said refrigerant is in the range of from about −40° C. to about −12° C.
14. A heat transfer system comprising an evaporator, a condenser and a compressor and a refrigerant in the system, said refrigerant consisting of:
about 49% by weight difluoromethane (HFC-32), about 11.5% by weight pentafluoroethane (HFC-125), and
about 39.5% by weight trifluoroiodomethane (CF3I), wherein the percentages are based on the total weight of said three compounds.
15. The refrigerant of claim 14 wherein said refrigerant is non-flammable.
16. A heat transfer composition comprising the refrigerant of claim 15 and POE lubricant.