Thermal diffusivity measurements of R1234yf and R1234ze(E) under saturation conditions using dynamic light scattering method

2,3,3,3-Tetrafluoroprop-1-ene (R1234yf) and trans-1,3,3,3-tetrafluoroprop-1-ene (R1234ze(E)) have gained increasing interesting due to their environmental properties and are expected as alternatives to 1,1,1,2-tetrafluoroethane (R134a). The purpose of this work is to investigate the thermal diffusivities of the two refrigerants with dynamic light scattering method, for which the reliability of the experimental setup was checked at first by measuring the thermal diffusivity of R134a. Then the thermal diffusivities of R1234yf and R1234ze(E) in the liquid phase were measured under saturation conditions from 298 K up to 378 K. The relative combined uncertainties of thermal diffusivity were estimated to be 2%, and increased to 3% when the reduced temperature above 0.95.