| 摘要 |
Disclosed are compositions useful in a wide variety of applications, including heat transfer fluids which possess a highly desirable and unexpectedly superior combination of properties, and heat transfer systems and methods based on these fluids. The preferred heat transfer fluid comprises from about 1 to about 40 percent, on a weight basis, of carbon dioxide (CO<SUB>2</SUB>) and from about 99 to about 60 percent, on a weight basis, of a compound having the Formula I XCF<SUB>z</SUB>R<SUB>3-z </SUB>(I), where X is a C<SUB>2 </SUB>or a C<SUB>3 </SUB>unsaturated, substituted or unsubstituted, alkyl radical, each R is independently Cl, F, Br, I or H, and z is 1 to 3. A preferred compound of Formula I is tetrafluoropropene, particularly 1,1,1,3-tetrafluoropropene and/or 1,1,1,3-tetrafluoropropene.
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