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WO1997034961B1 - DROP-IN SUBSTITUTES FOR 1,1,1,2-TETRAFLUOROETHANE (R-134a) REFRIGERANT - Google Patents

DROP-IN SUBSTITUTES FOR 1,1,1,2-TETRAFLUOROETHANE (R-134a) REFRIGERANT

Info

Publication number
WO1997034961B1
WO1997034961B1 PCT/US1997/004592 US9704592W WO9734961B1 WO 1997034961 B1 WO1997034961 B1 WO 1997034961B1 US 9704592 W US9704592 W US 9704592W WO 9734961 B1 WO9734961 B1 WO 9734961B1
Authority
WO
WIPO (PCT)
Prior art keywords
weight percent
mixture
present
refrigerant
tetrafluoroethane
Prior art date
Application number
PCT/US1997/004592
Other languages
French (fr)
Other versions
WO1997034961A1 (en
Filing date
Publication date
Application filed filed Critical
Priority to AU25862/97A priority Critical patent/AU2586297A/en
Publication of WO1997034961A1 publication Critical patent/WO1997034961A1/en
Publication of WO1997034961B1 publication Critical patent/WO1997034961B1/en

Links

Abstract

A group of refrigerant fluids that may be combined in novel ways to produce several excellent 'drop-in' substitutes for R-134a refrigerant. Performance is increased by constructing a zeotropic mixture of refrigrants, such that a single boiling point (of R-134a) is replaced by a 'temperature glide' between the mixture's 'bubble point' and 'dew point'. The temperature glide causes the phase change area in the condenser to be larger than with a single component refrigerant such as R-134a, thereby increasing heat rejection of the condenser, which lowers head pressures, and increases capacities and efficiencies compared to R-134a. Components are also selected to attempt to reduce the overall critical temperature of the mixture of refrigerants, also increasing performance and lowering head pressures under hot conditions with undersized condensers. Finally, a small amount of a mineral oil miscibility improver may be added, not to return mineral oil from the evaporator as in R-12 systems, but to keep waxes, tars, and other contaminates in the system that may have arisen from the manufacturing process (such as wax coatings on the motor windings in a hermetic compressor, or 'tar' from valve packing) soluble.

Claims

35
AMENDED CLAIMS
[received by the International Bureau on 30 September 1997 (30 09 97), original claims 10-12 amended, remaining claims unchanged (2 pages)]
6 The mixture of refrigerants of claim 1 in which heptafluoropropane is present in about 45 weight percent, 1 ,1- difluoroethane is present in about 15 weight percent, and pentafiuoroethane is present in about 40 weight percent
7 The mixture of refrigerants of claim 1 in which heptafluoropropane is present in about 45 weight percent, 1 ,1- difluoroethane is present in about 20 weight percent, and pentafiuoroethane is present in about 35 weight percent
8 A mixture of refrigerants that is a drop-in substitute for 1 ,1 ,1 ,2-tetrafluoroethane refrigerant in 1 ,1 , 1 ,2-tetrafluoroethane refrigeration systems, comprising about 75 weight percent heptafluoropropane, and about 25 weight percent pentafiuoroethane, with the weight percentages of said components being weight percentages of the overall mixture
9 A mixture of refrigerants that is a drop-in substitute for
1 ,1 ,1 ,2-tetrafluoroethane refrigerant in 1 ,1 ,1 ,2-tetrafluoroethane refrigeration systems, comprising about 1 weight percent isobutane, about 75 weight percent heptafluoropropane, and about 24 weight percent pentafiuoroethane, with the weight percentages of said components being weight percentages of the overall mixture
10 A mixture of refrigerants that is a drop-in substitute for 1 ,1 ,1 ,2-tetrafluoroethane refrigerant in 1 ,1 ,1 ,2-tetrafluoroethane refrigeration systems, comprising about 1 weight percent isobutane, about 22 - 57 weight percent heptafluoropropane, about 22 - 32 weight percent pentafiuoroethane, and about 10 weight percent 1 ,1 ,1 ,2-tetrafluoroethane, with the weight percentages of said components being weight percentages of the overall mixture
11 The mixture of refrigerants of claim 10 in which isobutane is present in about 1 weight percent, heptafluoropropane is present in about 67 weight percent, pentafiuoroethane is present in about 22 weight percent, and 1 ,1 ,1 ,2-tetrafluoroethane is present in about 10 weight percent, with the weight percentages of said components being weight percentages of the overall mixture
12 The mixture of refrigerants of claim 10 in which isobutane is present in about 1 weight percent, heptafluoropropane is present in about 57 weight percent, pentafiuoroethane is present in about 32 weight percent, and 1 ,1 ,1 ,2-tetrafluoroethane is present in about 10 weight percent, with the weight percentages of said components being weight percentages of the overall mixture
13 A mixture of refrigerants that is a drop-in substitute for 1 ,1 ,1 ,2-tetrafluoroethane refrigerant in 1 ,1 ,1 ,2-tetrafluoroethane refrigeration systems, comprising about 48 - 58 weight percent 1 ,1 ,1 ,2,2- pentafluoropropane, about 41 - 51 weight percent pentafiuoroethane, and about 1 weight percent propane, with the weight percentages of said components being weight percentages of the overall mixture
14 The mixture of refrigerants of claim 13 in which 1 ,1 ,1 ,2,2- pentafluoropropane is present in about 58 weight percent, pentafiuoroethane is present in about 41 weight percent, and propane is
PCT/US1997/004592 1996-03-22 1997-03-21 DROP-IN SUBSTITUTES FOR 1,1,1,2-TETRAFLUOROETHANE (R-134a) REFRIGERANT WO1997034961A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU25862/97A AU2586297A (en) 1996-03-22 1997-03-21 Drop-in substitutes for 1,1,1,2-tetrafluoroethane (r-134a) refrigerant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1394696P 1996-03-22 1996-03-22
US60/013,946 1996-03-22

Publications (2)

Publication Number Publication Date
WO1997034961A1 WO1997034961A1 (en) 1997-09-25
WO1997034961B1 true WO1997034961B1 (en) 1997-11-20

Family

ID=21762652

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/004592 WO1997034961A1 (en) 1996-03-22 1997-03-21 DROP-IN SUBSTITUTES FOR 1,1,1,2-TETRAFLUOROETHANE (R-134a) REFRIGERANT

Country Status (3)

Country Link
US (1) US5954995A (en)
AU (1) AU2586297A (en)
WO (1) WO1997034961A1 (en)

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GB0223724D0 (en) 2002-10-11 2002-11-20 Rhodia Organique Fine Ltd Refrigerant compositions
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CN1328350C (en) * 2004-04-05 2007-07-25 天津大学 Middle and high temperature heat pump mixed working medium containing HFC245fa
EP2380942B1 (en) 2006-03-03 2016-10-19 Rpl Holdings Limited Refrigerant composition
JP5139665B2 (en) * 2006-11-02 2013-02-06 出光興産株式会社 Lubricating oil composition for refrigerator
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