Critical parameters and PVT properties for R-404A
- Daikin Industries, Ltd., Settsu, Osaka (Japan). Chemical Div.
The critical parameters of R-404A. a ternary mixture of 44 mass % pentafluoroethane (R-125), 52 mass % 1,1,1-trifluoroethane (R-143a), and 4 mass % 1,1,1,2-tetrafluoroethane (R-134a), were measured by visual observation of the meniscus in an optical cell. The critical pressure, density, and temperature were determined to be (3.726 {+-} 0.002) MPa, (490 {+-} 3) kg/m{sup 3}, and (345.15 {+-} 0.01) K, respectively. Forty single-phase PVT properties have been measured with a constant-volume method along three isochores in a range of densities from 487 to 493 kg/m{sup 3}, temperatures from 345 K to 393 K, and pressures from 3.7 to 7.8 MPa. One hundred and nineteen densities of R-404A have been measured with a vibrating-tube densitometer over a density range from 47 to 1247 kg/m{sup 2} along eight isotherms between 263 K and 403 K and at pressures between 1.5 MPa and 15 MPa. An 18-term modified Benedict-Webb-Rubin equation of state for R-404A was developed using the PVT property data.
- OSTI ID:
- 316261
- Journal Information:
- Journal of Chemical and Engineering Data, Journal Name: Journal of Chemical and Engineering Data Journal Issue: 6 Vol. 43; ISSN JCEAAX; ISSN 0021-9568
- Country of Publication:
- United States
- Language:
- English
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