This work studies two binary mixtures of R1243zf + R1234yf and R245cb which can be possibly used as a long-term alternative refrigerant for heat pumps. We present critical property (critical temperature, pressure, density) vapor liquid equilibrium (VLE) binaries. The maximum extended uncertainties (k=2) are estimated U(T) = 0.21 K, U(p) 0.048 MPa, U(ρ) 6.4 kg/m3 measurement, 0.06 K 0.015 MPa bu...

in this work, a more accurate prediction of liquid evaporation flux has been achieved. the statistical rate theory approach, which is recently introduced by ward and fang and exact estimation of vapor pressure in the layer adjacent to the liquid–vapor interface have  been used for prediction of this flux. firstly, the existence of an equilibrium layer adjacent to the liquid-vapor interface is c...

This paper describes a properties-optimization work for the working fluids in NH3 / ionic liquid (ILs) based singleeffect absorption heat pumps. The optimum parameters of the IL can be used as criteria in screening task-specified ILs, which play the role of absorbents, in absorption heat pumps. First, a 8-parameter thermodynamic model to calculate performances of a single-effect absorption heat...

Abstract Exact knowledge of natural gas composition is essential in custody transfer to determine the energy content delivery. However, for liquefied (LNG), a reliable determination difficult. Here, we describe design laboratory‐scale reference liquefier that enables validation and calibration optical spectroscopy sensors by providing them with sample metrologically traceable composition. Hence...

Vapor–liquid equilibrium (VLE) and density data for binary systems of branched alkanes + ethyl acetate are scarce in the literature. In this study, mixtures 3-methylpentane 2,3-dimethylbutane were investigated. Density measurements at atmospheric pressure performed using a vibrating tube meter 293.15, 298.15 303.15 K. Large positive excess molar volumes calculated correlated Redlich–Kister-type...

The prediction method of the isobaric vapor-liquid-liquid equilibria (VLLE) data for the system ethanol-water-1-butanol and ethanol-2-butanol-water was studied. The parameters for the activity coefficients models were determined from the constituent binary VLE data. With the parameters, the isobaric ternary VLLE data were predicted and compared with the experimental ones obtained in our previou...

Modeling of thermodynamic properties mixed-solvent electrolyte solutions is challenging. Reliable experimental data are essential for any model development and parametrization. In this work, a benchmark database (water + methanol/ethanol alkali halide) presented. The available mean ionic activity coefficient (MIAC) vapor–liquid equilibrium (VLE) comprehensively collected critically evaluated 61...

An improved understanding of the Non-Random Two Liquid model can improve correlation vapor liquid equilibrium (VLE) phase behavior beyond trial-and-error approach often employed. This work provides a rigorous, systematic evaluation model’s capabilities to contribute unqualified, component-independent findings and recommendations─a limitation previous studies. First, evaluations isobaric isother...

The reliable solution of nonlinear parameter estimation problems is an important computational problem in chemical process engineering, both in on-line and off-line applications. Conventional solution methods may not be reliable since they do not guarantee convergence to the global optimum sought in the parameter estimation problem. We demonstrate here a technique, based on interval analysis, t...