Acoustic Properties and Derived Virial Coefficients for Gaseous Mixtures of 2,3,3,3-Tetrafluoropropene (R1234yf) + Hexafluoropropylene (R1216)

Abstract

The thermodynamic performance, safety, and environmentally friendly demands of the thermodynamic cycle are driving the exploration of new working fluid mixtures. Mixtures containing the fourth-generation refrigerant 2,3,3,3-tetrafluoropropene (R1234yf) show high application potential in many thermodynamic and refrigeration systems. Herein, we first measured the speed of sound of R1234yf + hexafluoropropylene (R1216) binary mixtures from 298 to 358 K and 45 to 1010 kPa with a relative combined uncertainty (k = 2) of 0.03%. Using the speed of sound data, we determined the compositions with an absolute combined uncertainty (k = 2) of 0.0013 mole fraction and determined the parameters of the hard core square well molecular potential model at the compositions. The interaction virial coefficients were derived experimentally and theoretically and were roughly consistent with each other over a far wider temperature range than the experimental temperatures. The current thermodynamic models were examined using the speed of sound data, and room for improvement was discovered.

Speed of Sound Measurements and Thermophysical Modeling of Binary Mixtures of Methyl Laurate and n-Dodecane

“…The binary mixtures of methyl laurate and n -dodecane as biodiesel can improve the engine performance well . The speed of sound can directly characterize fuel injection and NO x emissions from diesel engines. − Moreover, the speed of sound is essential for comprehending the intermolecular interactions in binary liquid mixtures. Therefore, data on the speed of sound of mixtures of methyl laurate + n -dodecane are greatly important.…”