An. Gurova et al., THE THERMAL-CONDUCTIVITY OF LIQUID 1,1,1,2-TETRAFLUOROETHANE (HFC 134A), International journal of thermophysics, 18(5), 1997, pp. 1077-1087
The thermal conductivity of HFC 134a was measured in the liquid phase
with the polarized transient hot-wire technique. The experiments were
performed at temperatures from 213 to 293 K at pressures up to 20 MPa.
The data were analyzed to obtain correlations in terms of density and
pressure. This study is part of an international project coordinated
by the Subcommittee on Transport Properties of Commission 1.2 of IUPAC
, conducted to investigate the large discrepancies between the results
reported by various authors for the transport properties of HFC 134a,
using samples of different origin. Two samples of HFC 134a from diffe
rent sources have been used. The thermal conductivity of the first sam
ple was measured along the saturation line as a function of temperatur
e and the data were presented earlier. The thermal conductivity of the
second one, the round-robin sample, was measured as a function of pre
ssure and temperature. These data were extrapolated to the saturation
line and compared with the data obtained, previously in order to demon
strate the importance of the sample origin and their real purity. The
accuracy of the measurements is estimated to be 0.5%. Finally, the res
ults are compared with the existing literature data.