IP Library › Patent Application 15804409
Patent Application
App. No. 15/804,409

HEAT TRANSFER COMPOSITIONS AND METHODS

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Patent No.
US None
App. No.
15/804,409
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.

Claims (29)

1 . 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; (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; (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.

2 . The heat transfer composition of claim 1 wherein said HFO-1234ze comprises trans-HFO-1234ze.

3 . The heat transfer composition of claim 1 comprising from greater than 15% to about 30% by weight of HFC-32.

4 . The heat transfer composition of claim 1 comprising from greater than 20% to about 30% by weight of HFC-32.

5 . The heat transfer composition of claim 1 comprising from greater than 10% to about 30% by weight of HFC-125.

6 . The heat transfer composition of claim 1 comprising from greater than 20% to about 30% by weight of HFC-125.

7 . The heat transfer composition of claim 1 having a weight ratio of HFC-32:HFC-125 of from about 0.9:1.2 to about 1.2:0.9.

8 . The heat transfer composition of claim 1 comprising from greater than 0% to about 25% by weight of HFO-1234yf.

9 . The heat transfer composition of claim 1 comprising from greater than 0% to about 22% by weight of HFO-1234yf.

10 . The heat transfer composition of claim 1 comprising from about 1% to about 30% by weight of HFO-1234ze.

11 . The heat transfer composition of claim 1 comprising from about 5% to about 30% by weight of HFO-1234ze.

12 . The heat transfer composition of claim 1 comprising from greater than 0% to about 25% by weight of HFO-1234yf and from about 1% to about 30% by weight of HFO-1234ze.

13 . The heat transfer composition of claim 1 comprising from greater than 0% to about 22% by weight of HFO-1234yf and from about 5% to about 30% by weight of HFO-1234ze.

14 . The heat transfer composition of claim 1 having a weight ratio of HFO-1234ze:HFO-1234yf of about 5:1 to about 0.1:1.

15 . The heat transfer composition of claim 1 having a weight ratio of HFO-1234ze:HFO-1234yf of between about 3:1 to about 0.2:1.

16 . The heat transfer composition of claim 1 having a weight ratio of 134a to a combination of HFO-1234ze and HFO-1234yf between about 5:7 to about 1:1.

17 . The heat transfer composition of claim 1 having a weight ratio of 134a to a combination of HFO-1234ze and HFO-1234yf of about 4:6.

18 . The heat transfer composition of claim 1 wherein HFO-1234ze is provided in an amount of about 20% and HFO-1234yf is provided in an amount of about 9%.

19 . The heat transfer composition of claim 1 wherein HFO-1234ze is provided in an amount of about 7% and HFO-1234yf is provided in an amount of about 20%.

20 . The heat transfer composition of claim 1 wherein HFO-1234ze is provided in an amount of about 26%.

21 . The heat transfer composition of claim 1 wherein HFO-1234ze is provided in an amount of about 17% and HFO-1234yf is provided in an amount of about 9%.

22 . The heat transfer composition of claim 1 comprising from greater than 15% to about 35% by weight of HFC-134a.

23 . The heat transfer composition of claim 1 comprising from greater than 15% to about 30% by weight of HFC-134a.

24 . The heat transfer composition of claim 1 further comprising up to about 5% by weight of CF3I.

25 . The heat transfer composition of claim 1 further comprising up to about 5% by weight of HFCO-1233ze.

26 . 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; (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; (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.

27 . A 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 10% to about 35% by weight of HFC-32; (b) from about 10% to about 35% by weight of HFC-125; (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; (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, said condenser having an operating temperature of from about 35° C. to about 45° C.

28 . The heat transfer system of claim 27 wherein said evaporator has an operating temperature of from about −40° C. up to less than about −15° C.

29 . The heat transfer system of claim 27 wherein said evaporator has an operating temperature of from about −35° C. to about −25° C.