This paper presents the study on the determination of the thermodynamic properties of Cis-1,3,3,3-tetrafluoropropene (R1234ze(Z)) with the BACKONE equation of state. | Vietnam Journal of Mechanics, VAST, Vol. 40, No. 4 (2018), pp. 387 – 395 DOI: BACKONE EQUATION OF STATE FOR CIS-1, 3, 3, 3-TETRAFLUOROPROPENE (R1234ZE(Z)) 1 Phan Thi Thu Huong1 , Lai Ngoc Anh2,∗ Nam Dinh University of Technology Education, Nam Dinh, Vietnam 2 Hanoi University of Science and Technology, Hanoi, Vietnam ∗ E-mail: anhngoclai@ Received October 19, 2018 Abstract. This paper presents the study on the determination of the thermodynamic properties of Cis-1,3,3,3-tetrafluoropropene (R1234ze(Z)) with the BACKONE equation of state. The BACKONE’s characteristic temperature T0 , characteristic density ρ0 , anisotropy factor α, and reduce quarupole moment Q∗2 were found by fitting the BACKONE EOS to experimental data of vapor pressure and saturated liquid density. All thermodynamic properties such as vapor pressure, pressure in gaseous phase, saturated liquid density, and liquid density can be determined easily from the found molecular characteristic properties. Thermodynamic properties of the R1234ze(Z) were evaluated with available experimental data. Average absolute deviations between calculated vapor pressure data and experimental data were . Average absolute deviations between calculated saturated liquid density data and experimental data were . In the prediction of the thermodynamic properties, average absolute deviations between calculated liquid density data and experimental data were and average absolute deviations between calculated gas density data and experimental data were . Keywords: HFO-1234ze(Z), R1234ze(Z), thermodynamic properties, BACKONE equation of state (EOS). 1. INTRODUCTION R245fa was considered as the alternative refrigerant of R114 in the past two decades. However, global warming potential (GWP) of R245fa is 1020 which is much higher than the recent requirement for the fourth generation of the refrigerants. One of the most potential alternative refrigerants for .
