HEAT TRANSFER METHODS, SYSTEMS AND COMPOSITIONS
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 heat transfer composition comprising a refrigerant consisting of:
from 48% by weight to 51% by weight difluoromethane (HFC-32),
11.5%+/−1% by weight pentafluoroethane (HFC-125), and
from 36.5% by weight to 40.5% by weight trifluoroiodomethane (CF3I), wherein said refrigerant is non-flammable when tested in accordance with ASTM E681-2009 as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013.
2 . The heat transfer composition of claim 1 wherein said CF3I is present in said refrigerant in an amount of about 38.5% by weight.
3 . The heat transfer composition of claim 2 wherein said HFC-125 is present in said refrigerant in an amount of 11.5%+/−0.5% by weight.
4 . The heat transfer composition of claim 1 wherein said HFC-32 is present in said refrigerant in an amount of about 50% by weight.
5 . The heat transfer composition of claim 2 wherein said HFC-32 is present in said refrigerant in an amount of about 50% by weight.
6 . The heat transfer composition of claim 3 wherein said HFC-32 is present in said refrigerant in an amount of about 50% by weight.
7 . The heat transfer composition of claim 1 further comprising a polyol ester (POE) lubricant.
8 . A method of cooling air in a heat transfer system of the type having an evaporator, a condenser, a compressor and heat transfer composition in the system, the method comprising:
(i) condensing the refrigerant, wherein said refrigerant consists of:
from 48% by weight to 51% by weight difluoromethane (HFC-32),
11.5% by weight pentafluoroethane (HFC-125), and
from about 36.5% by weight to about 40.5% by weight trifluoroiodomethane (CF3I), and wherein said refrigerant is non-flammable when tested in accordance with ASTM E681-2009 as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013; and
ii) evaporating the composition in the vicinity of body or article to be cooled, wherein the evaporating comprises evaporating the refrigerant at a temperature of from about −40° C. to about −10° C.
9 . The method of claim 8 wherein said CF3I is present in said refrigerant in an amount of about 38.5% by weight.
10 . The method of claim 9 wherein said HFC-125 is present in said refrigerant in an amount of 11.5%+/−0.5% by weight.
11 . The method of claim 8 wherein said HFC-32 is present in said refrigerant in an amount of about 50% by weight.
12 . The method of claim 10 wherein said HFC-32 is present in said refrigerant in an amount of about 50% by weight.
13 . The method of claim 11 wherein said HFC-32 is present in said refrigerant in an amount of about 50% by weight.
14 . The method of claim 8 wherein said heat transfer composition further comprises a polyol ester (POE) lubricant.
15 . The method of claim 8 wherein said system is a stationary air conditioning system or a chiller system.
16 . A method of heating air in a heat transfer system of the type having an evaporator, a condenser, a compressor and heat transfer composition in the system, the method comprising:
(i) condensing the refrigerant, wherein said refrigerant consists of:
from 48% by weight to 51% by weight difluoromethane (HFC-32),
about 11.5% by weight pentafluoroethane (HFC-125), and
from about 36.5% by weight to about 40.5% by weight trifluoroiodomethane (CF3I), and wherein said refrigerant is non-flammable when tested in accordance with ASTM E681-2009 as required in ASHRAE Standard 34-2013 and described in Appendix B1 to ASHRAE Standard 34-2013; and
ii) evaporating the composition in the vicinity of body or article to be cooled, wherein the evaporating comprises evaporating the refrigerant at a temperature of from about −20° C. to about 3° C.
17 . The method of claim 18 wherein said heat transfer composition further comprises a polyol ester (POE) lubricant.
18 . The method of claim 17 wherein said HFC-125 is present in said refrigerant in an amount of 11.5%+/−0.5% by weight.
19 . The method of claim 17 wherein said HFC-32 is present in said refrigerant in an amount of about 50% by weight.
20 . The method of claim 18 wherein said HFC-32 is present in said refrigerant in an amount of about 50% by weight.