Heat transfer methods, systems and compositions
Disclosed are heat transfer compositions and methods and systems containing refrigerants consisting essentially of difluoromethane (HFC-32), and trifluoroiodomethane (CF3I), and heat transfer compositions and methods and systems containing refrigerants consisting essentially of difluoromethane (HFC-32), and trifluoroiodomethane (CF3I) and CO2.
1. A refrigerant consisting essentially of:
about 38% by weight difluoromethane (HFC-32),
from 57% to 59% by weight trifluoroiodomethane (CF3I); and
from 2% to 5% by weight of CO2.
2. The refrigerant of claim 1 wherein the refrigerant in non-flammable.
3. The refrigerant of claim 1 consisting of:
about 38% by weight difluoromethane (HFC-32),
from 57% to 59% by weight trifluoroiodomethane (CF3I); and
from 2% to 5% by weight of CO2.
4. The refrigerant of claim 3 wherein the refrigerant in non-flammable.
5. The refrigerant of claim 1 consisting essentially of:
about 38% by weight difluoromethane (HFC-32),
from 58%+/−0.5% to 59%+/−0.5% by weight trifluoroiodomethane (CF3I); and
from 2% to 3.5% by weight of CO2.
6. The refrigerant of claim 1 consisting of:
about 38% by weight difluoromethane (HFC-32),
from 58%+/−0.5% to 59%+/−0.5% by weight trifluoroiodomethane (CF3I); and
from 2% to 3.5% by weight of CO2.
7. The refrigerant of claim 1 consisting essentially of:
38%+/−0.5% by weight difluoromethane (HFC-32),
59%+/−0.5% by weight trifluoroiodomethane (CF3I); and
3%+/−0.5% by weight of CO2.
8. The refrigerant of claim 1 consisting of:
38%+/−0.5% by weight difluoromethane (HFC-32),
59%+/−0.5% by weight trifluoroiodomethane (CF3I); and
3%+/−0.5% by weight of CO2.
9. A method of cooling in a heat transfer system comprising an evaporator, a condenser and a compressor, the process comprising the steps of i) condensing a refrigerant of claim 1 and ii) evaporating said refrigerant in the vicinity of body or article to be cooled, wherein said refrigerant evaporates at a temperature of in the range of from about −40° C. to about −10° C.
10. A method of cooling in a heat transfer system comprising an evaporator, a condenser and a compressor, the process comprising the steps of i) condensing a refrigerant of claim 1 and ii) evaporating said refrigerant in the vicinity of body or article to be cooled, wherein said refrigerant evaporates at a temperature of in the range of from about −30° C. to about 5° C.
11. The method of claim 9 wherein the heat transfer system is an air conditioning system.
12. The method of claim 11 wherein the air conditioning system is a residential air-conditioning system with an evaporator temperature in the range of about 0 to about 10° C.
13. The method of claim 12 wherein said residential air conditioning system comprises a reciprocating, rotary (rolling piston or rotary valve) or scroll compressor.
14. A method of replacing an existing refrigerant contained in a heat transfer system comprising removing at least a portion of said existing refrigerant from said system, said existing refrigerant being R-410A and replacing at least a portion of said existing refrigerant by introducing into said system a refrigerant as claimed in claim 1 .
15. A refrigerant consisting essentially of from about 34% to about 38% by weight of HFC-32, and fom about 62% to about 66% by weight of CF 3 I.
16. The refrigerant of claim 15 which consists essentially of about 36% by weight of HFC-32 and about 64% by weight of CF 3 I.
17. The refrigerant of claim 15 consisting essentially of about 38% by weight of HFC-32 and about 62% by weight of CF 3 I.
18. A heat transfer composition comprising a refrigerant as defined in claims 1 and a lubricant and/or at least one stabiliser.
19. The heat transfer composition of claim 18 comprising polyol ester (POE) lubricant.
20. The heat transfer composition of claim 1 comprising polyol ester (POE) lubricant.