烯烃制冷剂统计缔合流体理论状态方程参数优化

打开文本图片集

中图分类号：TK121 文献标志码：A

DOI： 10.7652/xjtuxb202509013 文章编号：0253-987X（2025）09-0132-10

Abstract： To accurately characterize the thermodynamic properties of hydrofluoroolefin （HFO） refrigerants with polar characteristics， this study enhances the original Statistical Associating Fluid Theory equation of state based on variable-range Mie potential （SAFT-VR-Mie） by incorporating an explicit polar term. Using experimental data of saturated vapor pressure， saturated liquid density，and saturated vapor density for ten HFO refrigerants， the molecular characteristic parameters of the modified equation through nonlinear regression are determined. The improved equation is employed to calculate various physical properties， including saturated vapor pressure， saturated liquid density， saturated vapor density， enthalpy of vaporization， isobaric heat capacity，and speed of sound. The overall average absolute deviations between calculated and experimental values are 0.48% ， 0.94% ， 0.06% ， 2.24% ， 3.78% ，and 0.26% ， respectively. A comparative analysis between the modified and original SAFT-VR-Mie equations is conducted for R1234yf and R1234ze （E）refrigerants. Results demonstrate that the modified equation achieves superior prediction accuracy for all thermodynamic properties except isobaric heat capacity. Furthermore，when applied to predict vapor-liquid equilibrium properties of five HFO binary mixtures， the modified SAFT-VR-Mie equation outperforms Refprop software calculations even without considering binary interaction parameters （ kij=0 ）.

Keywords： statistical associating fluid theory； hydrofluoroolefins； polar term； thermodynamicproperty

为了保护环境和减少温室气体排放，具有较高全球变暖潜能值（GWP）的氢氟碳化物（HFCs）制冷剂已成为一系列环境法规要求逐步淘汰的自标。（剩余20434字）