ABSTRACT

This paper presents experimental results for the trifluoromethane (R23) + nitrous oxide (N2O) system, which has been chosen as a working fluid for low-temperature applications since it might be a valid option for the low-temperature stage in a cascade cycle. The thermodynamic properties of the binary mixture's constituents are well known from the literature, but no experimental results have been published to date on the PVTx properties of this binary system. PVTx measurements were obtained for the binary R23 + N2O system for three isotherms (303, 323, and 343 K), performing 15 Burnett expansions in a range of pressures from about 4400 to 80 kPa. The second and third virial coefficients were derived from experimental results together with the second and third cross virial coefficients. The experimental uncertainties in the second and third virial coefficients were estimated to be within +-1 cm3*mol-1 and +-500 cm6*mol-2, respectively

Compounds

#	Formula	Name
1	CHF3	trifluoromethane
2	N2O	nitrous oxide

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	1 2	2nd virial coefficient, m3/mol ; Gas	Temperature, K; Gas Mole fraction - 2; Gas	Gas	DERIVED:3rdvir:UFactor:0.5	15
POMD	1 2	3rd virial coefficient, m6/mol2 ; Gas	Temperature, K; Gas Mole fraction - 2; Gas	Gas	Derived graphically	15
POMD	1 2	Compressibility factor ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Mole fraction - 2; Liquid	Liquid	Burnett expansion method	142

Thermodynamics Research Center / ThermoML | International Journal of Thermophysics

Virial Coefficients from Burnett Measurements for the R23 + N2O System

Corvaro, F.[Francesco], Di Nicola, G., Polonara, F., Stryjek, R.

ABSTRACT