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) from about 10% to about 35% by weight of HFC-32; (b) from about 10% to about 35% by weight of HFC-125; (c) from about 20% to about 50% by weight of HFO-1234ze, HFO-1234yf and combinations of these; (d) from about 15% to about 35% by weight of HFC-134a; and optionally (e) up to about 10% by weight of CF3I and up to about 5% by weight of HFCO-1233ze, with the weight percent being based on the total of the components (a)-(e) in the composition
Claims14
-11. (canceled)
A heat transfer composition comprising:
- (a) from about 12.5% to about 13.0% by weight of HFC-32;
- (b) from about 12.5% to about 13.0% by weight of HFC-125;
- (c) from about 30% to about 31.5% by weight of HFC-134a;
- (d) from about 16% to about 44% by weight HFO-1234ze;
- and (e) from about 0% to about 30% by weight HFO-1234yf with the weight percent being based on the total of the components (a)-(e) in the composition.
The heat transfer composition of claim 1 wherein said HFO-1234ze comprises trans-HFO-1234ze.
The heat transfer composition of claim 1 wherein said HFO-1234ze consists essentially of trans-HFO-1234ze.
The heat transfer composition of claim 1 wherein the weight ratio of HFO-1234ze:HFO-1234yf is from about 5:1 to about 3:1.
The heat transfer composition of claim 1 further comprising at least one polyol ester lubricant.
The heat transfer composition of claim 1 having a coefficient of performance, based upon HFC-404A, of about 100% or greater.
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 12.5% to about 13.0.% by weight of HFC-32;
- (b) from about 12.5% to about 13.0% by weight of HFC-125;
- (c) from about 30% to about 31.5% by weight of HFC-134a;
- (d) from about 16% to about 44% by weight HFO-1234ze;
- and (e) from about 0% to about 30% by weight HFO-1234yf, with the weight percent being based on the total of the components (a)-(e) in the composition.
A low temperature refrigeration, medium temperature refrigeration or air conditioning heat transfer system comprising a compressor, a condenser and an evaporator in fluid communication, and a heat transfer composition in said system, said heat transfer composition comprising:
- (a) from about 12.5% to about 13.0% by weight of HFC-32;
- (b) from about 12.5% to about 13.0% by weight of HFC-125;
- (c) from about 30% to about 31.5% by weight of HFC-134a;
- (d) from about 16% to about 44% by weight HFO-1234ze;
- and (e) from about 0% to about 30% by weight HFO-1234yf, with the weight percent being based on the total of the components (a)-(e) in the composition, said condenser having an operating temperature of from about 35° C. to about 45° C.
Dependencies are inferred from the claim text.