Measurement of thermal conductivity of cis-1,1,1,4,4,4-hexafluoro-2-butene (R-1336mzz(Z)) by the transient hot-wire method

A Hydro-Fluoro-Olefin refrigerant cis-1,1,1,4,4,4-hexafluoro-2-butene (R-1336mzz(Z)) has low global warming potentials and it is considered as a potential working fluid for high temperature heat pump and Organic Rankine Cycle. Thermophysical properties of this fluid are necessary to be used in practical system. In this work, thermal conductivity of R-1336mzz(Z) is measured using a well-known transient hot wire method. A polarization voltage of 6 V was applied to minimize the effect of polarity. The thermal conductivity of liquid and gaseous R-1336mzz(Z) is measured in the temperature which ranges from 314 K to 435 K and 321 K to 496 K, respectively at a pressure up to 4 MPa and proposed simplified correlations. Total standard uncertainties of thermal conductivity measurements in liquid and gas phase were estimated to be less than ±2.07% and ±2.26% respectively and near the critical temperature, the uncertainty increases to ±3.40%.