A Helmholtz Energy Equation of State for trans-1,1,1,4,4,4-Hexafluoro-2-butene [R-1336mzz(E)]

Published

February 8, 2023

Author(s)

Ryo Akasaka, Marcia L. Huber, Luke Simoni, Eric W. Lemmon

Abstract

This work presents a fundamental equation of state for the thermodynamic properties of R-1336mzz(E). The equation of state is expressed explicitly in the Helmholtz energy with temperature and density as the independent variables, and is based on consistent experimental datasets, including the critical parameters, vapor pressure, saturated liquid and vapor densities, (p, ρ, T) behavior, vapor-phase sound speed, and ideal-gas isobaric heat capacity. The equation of state is valid for temperatures from 287 K to 410 K and pressures up to 5.7 MPa. In this range, expected relative uncertainties at the 95 % confidence interval (k = 2) are 0.1 % for vapor pressures, 1 % for saturated liquid densities, 1 % for saturated vapor densities, 0.15 % for liquid densities, 0.5 % for vapor densities, and 0.05 % for vapor-phase sound speeds, except in the critical region where larger uncertainties of up to 2 % are sometimes observed in densities. The equation exhibits reasonable behavior in the critical and extrapolated regions; this is demonstrated by several plots of derived properties over wide ranges of temperature and pressure. Through the use of the new equation of state, this work also formulates an extended corresponding states (ECS) model for the viscosity and thermal conductivity of R-1336mzz(E) to represent recent experimental data for these properties mostly within their experimental uncertainties.

Citation

International Journal of Thermophysics

Volume

44

Pub Type

Journals

Download Paper

https://doi.org/10.1007/s10765-022-03143-5

Local Download

Keywords

Density · Equation of state · R-1336mzz(E) · Sound speed · Thermal conductivity · Vapor pressure · Viscosity

Citation

Akasaka, R. , Huber, M. , Simoni, L. and Lemmon, E. (2023), A Helmholtz Energy Equation of State for trans-1,1,1,4,4,4-Hexafluoro-2-butene [R-1336mzz(E)], International Journal of Thermophysics, [online], https://doi.org/10.1007/s10765-022-03143-5, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935812 (Accessed February 13, 2025)