Thermodynamic, transport, and radiation properties of HFO-1336mzz(E) mixtures as eco-friendly SF6 alternatives

HFO-1336mzz(E) is proposed as a novel alternative to SF6 due to its low greenhouse effect and high insulation strength. Typically, it is mixed with CO2 or Air to lower its boiling point to meet the minimum operating temperature. To better understand the thermophysical properties of the gases' arcing plasma, the composition, thermodynamic properties, transport properties, and net emission coefficient of 30% molar fraction of HFO-1336mzz(E) mixed with CO2 or Air at temperatures from 300 K to 30 000 K at 0.12 MPa are calculated. It is found that HFO-1336mzz(E) mixtures have similar turbulent energy dissipation and thermal interruption capability to the pure SF6. Analysis of radiation characteristics demonstrates that the HFO-1336mzz(E) mixtures at 0.12 MPa exhibit stronger radiation emission compared to SF6 at 0.1 MPa, which indicates good arc radiation dissipation capabilities within such mixtures. This study reports the properties of thermal plasma of HFO-1336mzz(E) mixtures for the first time. These findings not only provide fundamental data for further magneto-hydro-dynamic calculations for arcing process but also put forward the potential application of these mixtures as arc interruption medium in medium voltage switchgears.

Automated summary

HFO-1336mzz(E) is proposed as a new alternative to SF6 with low greenhouse effect and high insulation strength. The thermophysical properties of HFO-1336mzz(E) mixed with CO2 or Air at different temperatures were calculated, including composition, thermodynamic properties, transport properties, and net emission coefficient. The results showed that HFO-1336mzz(E) mixtures exhibit similar energy dissipation and thermal interruption capability as pure SF6, with stronger radiation emission. This study provides important data for magneto-hydro-dynamic calculations and suggests the potential application of HFO-1336mzz(E) mixtures as arc interruption medium.