Compressed and Saturated Liquid Densities for 18 Halogenated Organic Compounds^†

The pressure−density−temperature P(ρ,T)
behavior of 18 liquids that are potential working fluids
in
thermal machinery has been measured using a vibrating tube densimeter.
For each liquid, the data
were taken on isotherms spaced at intervals of 5 K to 10 K spanning the
temperature range 245 K to 370
K. The pressures ranged from just above the vapor pressure (or the
critical pressure) to 6500 kPa. The
results of measurements at more than 12 000 thermodynamic points are
summarized by correlating
functions. Comparison with data from other laboratories indicates
that the relative expanded uncertainty
in the measured densities is less than 0.05%, except in the critical
region. The repeatability of the
measured densities is on the order of 0.005%. For each liquid,
the P(ρ,T) data were extrapolated to
the
vapor pressure to obtain the density of the liquid at the vapor
pressure. The fluids studied (and their
designations by the refrigeration industry) were trichlorofluoromethane
(R11), chlorodifluoromethane
(R22), 1,1-dichloro-2,2,2-trifluoroethane (R123),
1,2-dichloro-1,2,2-trifluoroethane (R123a),
1-chloro-1,2,2,2-tetrafluoroethane (R124), 1,1,2,2-tetrafluoroethane (R134),
1,1,1,2-tetrafluoroethane (R134a), 1,1-dichloro-1-fluoroethane (R141b), 1,1,1-trifluoroethane (R143),
1,1,2-trifluoroethane (R143a), pentafluorodimethyl
ether (E125), 1,1-difluoroethane (R152a), octafluoropropane (R218),
1,1,1,2,3,3,3-heptafluoropropane
(R227ea), 2-(difluoromethoxy)-1,1,1-trifluoroethane (E245),
1,1,1,2,2-pentafluoropropane (R245cb), 1,1,1,3,3-pentafluoropropane (R245fa), and propane (R290).