Heat transfer compositions and methods
AssigneeHoneywell International Inc.
InventorsSamuel F. Yana Motta, Mark W. Spatz, Ronald P. Vogl, Elizabet del Carmen Vera Becerra
Life of this patent
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Abstract
Compositions, methods and systems which comprise or utilize a multi-component mixture comprising: (a) HFC-32; (b) HFC-125; (c) HFO-1234yf and/or HFO-1234ze; (d) HFC-134a. In certain non-limiting aspects, such refrigerants may be used as a replacement for R-404A.
Claims22
A heat transfer composition comprising:
- (a) from about 10% to about 35% by weight of HFC-32;
- (b) from about 10% to about 35% by weight of HFC-125, wherein the weight ratio of said HFC-32:HF-125 is from about 0.9:1.2 to about 1.2:0.9;
- (c) from greater than 0% to about 30% by weight of HFO-1234yf and from greater than 0% to about 30% by weight of HFO-1234ze, wherein the ratio of HFO-1234ze:HFO-1234yf is about 7:20 and wherein said HFO-1234ze consists essentially of transHFO-1234ze;
- (d) from about 10% to about 35% by weight of HFC-134a, with the weight percent being based on the total of the components (a)-(d) in the composition.
A method of replacing an existing heat transfer fluid contained in heat transfer system comprising removing at least a portion of said existing heat transfer fluid from said system, said existing heat transfer fluid being HFC-404A and replacing at least a portion of said existing heat transfer fluid by introducing into said system a heat transfer composition comprising:
- (a) from about 10% to about 35% by weight of HFC-32;
- (b) from about 10% to about 35% by weight of HFC-125, wherein the weight ratio of said HFC-32:HF-125 is from about 0.9:1.2 to about 1.2:0.9;
- (c) from about 0% to about 30% by weight of HFO-1234yf and from greater than 0% to about 30% by weight of HFO-1234ze wherein the ratio of HFO-1234ze:HFO-1234yf about 7:20 and wherein said HFO-1234ze consists essentially of transHFO-1234ze;
- (d) from about 10% to about 35% by weight of HFC-134a, with the weight percent being based on the total of the components (a)-(d) in the composition.
Dependencies are inferred from the claim text.