Development of Helmholtz Equation of State for Thermodynamic Properties of R-1233zd(E)

Abstract

The application of refrigerants from the Hydro Chloro Fluoro Olefins (HCFO) group, namely R-1233zd(E), in addition to the Hydro Fluoro Olefins (HFO), is a solution to environmental problems. A thermodynamic equation of state for R-1233zd(E), which can predict all thermodynamic properties over a wide-range fluid phase, is proposed in a function of the Helmholtz free energy. Three ancillary equations support the development and application. A genetic algorithm method combined with a weighted least squares regression was applied. The Helmholtz equation of state has an average absolute deviation of 0.12% for the liquid density, 2.0% for the vapor density, 1.4% for the vapor pressure, 0.16% for the saturated liquid density, 4.1% for the saturated vapor density, 3.6% for the isobaric specific heat, and 0.15% for the speed of sound in the liquid phase, and 0.18% for the speed of sound in the vapor phase. The deviation of the isochoric and saturated specific heats was not evaluated yet due to unavailable experimental data. The reasonable behavior of its extrapolation and ideal characteristic curves confirm its reliability. The Helmholtz equation of state can predict thermodynamic properties from the triple point to 1000 K and 100 MPa.

New Thermodynamic Equation of State for Refrigerant HFO-1243zf

“…The modeling procedure and program code used in this study were used for refrigerants of HFC, hydrocarbon, HFO, and hydrochlorofluoroolefin (HCFO). Our recent article reported their implementation for HFO [20] dan HCFO [21]. More detailed optimization procedures used can be found in previous work [22].…”

Modelling of viscosity equation for liquid-phase HCFO-1233zd(E)

“…Entropy values, which can be derived from the EOS, are required to develop the EES model. Recently available EOS for HCFO-1233zd(E) are developed by Mondejar et al [5], Budiarso and Astina [13], and Akasaka and Lemmon [14].…”