HEAT TRANSFER COMPOSITIONS AND METHODS
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United States of America Patent
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Issued Date -
Oct 24, 2024
app pub date -
Jun 28, 2024
filing date -
Jun 28, 2024
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Abstract
Disclosed are methods of retrofitting heat transfer systems containing or designed to containing HFC-134a as the refrigerant comprising: removing at least a portion of said HFC-134a from said system; and introducing into said system a refrigerant comprising at least about 97.5% by weight of the following four components, with each compound being present in the following relative percentages:
- (a) from 2% to about 7% by weight of difluoromethane (HFC-32);(b) from 2% to about 7 by weight of pentafluoroethane (HFC-125);(c) from about 35% to about 50% by weight of 1,1,1,2-tetrafluoroethane (HFC-134a); and(d) from about 50% to about 55% by weight of trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)).
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