Heat transfer methods, systems and compositions
AssigneeHoneywell International Inc.
InventorsAnkit SETHI, Samuel F. YANA MOTTA, Gustavo POTTKER, Gregory Laurence SMITH, Elizabet del Carmen VERA BECERRA, Yang ZOU, Joshua CLOSE
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Abstract
The present invention relates to a refrigerant composition, including difluoromethane (HFC-32), pentafluoroethane (HFC-125), and trifluoroiodomethane (CF3I) 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.
Claims23
A refrigerant comprising at least about 98.5% by weight of a blend of three compounds, said blend consisting essentially of:
- from 42% by weight to 48% by weight difluoromethane (HFC-32),
- from 6.5% by weight to 12.5% by weight pentafluoroethane (HFC-125), and
- from 39.5% by weight to 45.5% by weight trifluoroiodomethane (CF3I),
- wherein the percentages are based on the total weight of said three compounds in the blend.
A refrigerant comprising at least about 99.5% by weight of a blend of three compounds, said blend consisting essentially of:
- from 43% by weight to 51% by weight difluoromethane (HFC-32),
- from 3.5% by weight to 11.5% by weight pentafluoroethane (HFC-125), and
- from 37.5% by weight to 45.5% by weight trifluoroiodomethane (CF3I),
- wherein the percentages are based on the total weight of said three compounds in the blend.
A method of cooling in a heat transfer system comprising an evaporator, a condenser and a compressor, the method comprising i) condensing a heat transfer composition comprising at least about 98.5% by weight of a blend of three compounds, said blend consisting essentially of:
- from 42% by weight to 48% by weight difluoromethane (HFC-32),
- from 6.5% by weight to 12.5% by weight pentafluoroethane (HFC-125), and
- from 39.5% by weight to 45.5% by weight trifluoroiodomethane (CF3I),
- wherein the percentages are based on the total weight of said three compounds in the blend, and ii) evaporating the blend in the vicinity of body or article to be cooled;
- wherein the evaporator temperature of the heat transfer system is in the range of from about −40° C. to about −10° C.
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 comprising at least about 98.5% by weight of a blend of three compounds, said blend consisting essentially of:
- from 42% by weight to 48% by weight difluoromethane (HFC-32),
- from 6.5% by weight to 12.5% by weight pentafluoroethane (HFC-125), and
- from 39.5% by weight to 45.5% by weight trifluoroiodomethane (CF3I),
- wherein the percentages are based on the total weight of said three compounds in the blend.
Dependencies are inferred from the claim text.