Thermal Conductivity and Viscosity of a New Stratospherically Safe Refrigerant- 1, 1, 1, 2-Tetrafluoroethane (R-134A)

THE~$L CONDUCTIVITY AND VISCOSITY OP A NEW STRATOSPHERICALLY SAFE REPRIGERANT1,1,1,2-TETRAPLUOROETHANE (R-l34A) I. R. Shankland R. s. Basu D. P. Wilson GenetronR Products Laboratory Allied-Signal, Inc. 20 Peabody st. Buffalo, NY 14210 Recent hypothesis on stratospheric ozone deple tion by chlorofluorocarbons has prompted industry to lo ok for environmentally safe alternates to refrigerants such as dichlorodifluoromethane (R-l34a) . In order to help de sign compressor and refrigeration equipment a number of basic therm ophysical property data is needed. There is a real lack of such d ata on R-l34a in the open literature. Measurements on thermal conductivity and visco sity of R-l34a are discussed in this paper. No data on these properties have been found in the literature. Thermal conductivity is measured by a transient hot wire method in our research labo ratory over a temperature range of 5° to 54°C. Viscosity is measured by Ostwald Viscometer in a temperature range of -25° to 7 0°C. Correlation equations have been developed for these proper ties over the range of measured data.