Thermal conductivity measurements for trans-1,3,3,3-Tetrafluoropropene (R1234ze(E)) in liquid phase

International regulations, such as the European Regulation EU No 517/2014, are pushing the refrigeration, heat pumps and air conditioning sectors to find suitable low-GWP working fluids as alternatives to the currently widespread high-GWP refrigerants, such as R134a and R410A. Halogenated olefins (HFOs and HCFOs) have been considered promising and, among these, trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) has been identified as a potential alternative to R134a in medium temperature applications, including aircooled and water-cooled chillers, heat pumps, refrigerators and combined with CO2 in cascade systems. The thermodynamic properties of R1234ze(E) have been widely studied in the last decade. Instead, a comprehensive experimental knowledge on the transport properties of R1234ze(E) is still missing. In order to increase the available experimental transport property data, the present study reports thermal conductivity measurements carried out with a new transient hot-wire (THW) apparatus on R1234ze(E) in the liquid phase at temperatures from 243 K to 343 K and pressure up to 8 MPa. The reported uncertainty is estimated to be lower than 2% and the measurements resulted in agreement with the available literature data.