The Paris Agreement on climate change, in which many nations have agreed to limit greenhouse gas emissions, has spurred interest in developing working fluids with low global warming potential (GWP) that can satisfy environmental concerns and have thermophysical properties that can meet engineering performance requirements. One such fluid is 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone (also known as Novec-649 and Novec-1230), which has potential applications in organic Rankine cycles (ORC), electronics cooling, computer/data center cooling and fire extinguishing. In this work, viscosity measurements of 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone were reported. The measurements were performed over the temperature range of (243 to 373) K and at pressures up to 40 MPa using a vibrating-wire viscometer. The combined expanded uncertainty of the reported viscosity was 2 % with a confidence level of 0.95 (k = 2). These experimental data were used to develop a viscosity correlation that covers a wide temperature and pressure range, with an estimated uncertainty at a 95% confidence level of 2% for the liquid phase from (240 to 400) K at pressures up to 40 MPa.
The
compressed liquid viscosities of 2-methylpentane, 3-methylpentane,
and 2,3-dimethylbutane were measured using a vibrating-wire viscometer
over the temperature range of (273 to 343) K and at pressures up to
40 MPa. The combined expanded uncertainty of the reported viscosity
is about 2% with a confidence level of 0.95 (k =
2). An empirical Andrade–Tait equation was used to correlate
the viscosity as a function of temperature and pressure with average
absolute percentage deviations of 0.19%, 0.23%, and 0.25%, respectively.
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