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A Helmholtz Energy Equation of State for 3,3,3-Trifluoroprop-1-ene (R-1243zf)

Published

Author(s)

Ryo Akasaka, Eric Lemmon

Abstract

A new fundamental equation of state expressed as a function of the Helmholtz energy is presented for 3,3,3-trifluoroprop-1-ene (R-1243zf). The equation is valid from the triple point temperature (122.35 K) to 430 K at pressures up to 35 MPa. The expected uncertainties (k = 2) in calculated properties from the equation of state are 0.1 % for vapor pressures, 0.1 % for liquid densities, 1 % for vapor densities, 0.3 % for saturated liquid densities, 1 % for saturated vapor densities, 0.06 % for vapor-phase sound speeds, and 2 % for liquid-phase isobaric heat capacities. Differences between experimental and calculated vapor pressures are within 2 kPa in most cases. Uncertainties for caloric properties are particularly improved from the former equations of state. Various plots of constant-property lines demonstrate that not only does the equation exhibit correct behavior over all temperatures and pressures within the range of validity, but also that it shows reasonable extrapolation behavior at extremely low and high temperatures, and at high pressures.
Citation
International Journal of Thermophysics
Volume
46

Keywords

Density , Equation of state , Heat capacity , R-1243zf , Refrigerant, Sound speed , Vapor pressure , Virial coefficient

Citation

Akasaka, R. and Lemmon, E. (2025), A Helmholtz Energy Equation of State for 3,3,3-Trifluoroprop-1-ene (R-1243zf), International Journal of Thermophysics, [online], https://doi.org/10.1007/s10765-024-03481-6, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=959110 (Accessed February 19, 2025)

Issues

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Created January 15, 2025, Updated January 16, 2025