Measurement and Correlation of Gaseous pvT Property for 1,1,1,3,3,3-Hexafluoro-2-methoxypropane (HFE-356 mmz)

Abstract

As one of the most promising alternative refrigerants, 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFE-356 mmz) is considered to have the potential to be applied in a high temperature heat pump and the organic Rankine cycle. The gaseous pvT properties of HFE-356 mmz were measured using the isochoric method in the temperature range from 333.068 K to 451.226 K, the pressure range from 104.9 to 1997.3 kPa, and the density range from 75.0 mol•m −3 to 882.0 mol•m −3 . The threeterm truncated virial equation of state for gaseous HFE-356 mmz was also fitted based on the experimental data.

Thermophysical Properties of 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFE-356mmz) in the Vapor Phase Measured by Using an Acoustic-Microwave Resonance Technique

“…Table 8 shows the results for the density data of HFE-356mmz with the estimated standard uncertainties, which correspond to typically 4%. Figures 6 and 7 illustrate the pressure dependence of the density on the five isotherms and the pressure deviation of the present PVT data from the virial equation by Chen et al [7], respectively. It was found from Figure 7 that the present data are consistent with the reference equation almost within 2%.…”

“…It was found from Figure 7 that the present data are consistent with the reference equation almost within 2%. According to the reference [7], the virial equation reproduces the PVT data with a maximum pressure deviation of 1.984%. Therefore, most of the present data agreed well within the uncertainty of the virial equation.…”

“…Figure 7. Pressure deviation of the present pressure-volume-temperature (PVT) data from the virial equation by Chen et al[7] for HFE-356mmz. The base line corresponds to the pressure calculated from the virial equation.…”

“…where B ε , C ε , and C ρ indicate the second dielectric-virial coefficient, the third dielectric-virial coefficient, and the third density-virial coefficient, respectively. The ideal-gas molar polarization of HFE-356mmz was determined from the intercept value of the polynomial regression for Equation (7) using the dielectric permittivity data on the isotherms. The results for the ideal-gas molar polarization of HFE-356mmz were summarized in Table 7.…”

“…Thermophysical properties of a working fluid to be used in the ORC represent an indispensable information for the evaluation of the performance of the thermodynamic cycle. Some researchers previously reported experimental data of some thermophysical properties of HFE-356mmz; for example, Sako et al [5] measured the critical properties and the normal boiling point, Alam et al [6] measured the thermal conductivity and the kinematic viscosity, and Chen et al [7] measured the pressure-volume-temperature (PVT) relation in the vapor phase.…”