Vapor-Liquid Equilibrium Data Concerning Refrigerant Systems: Equipment, Data and Modelling (original) (raw)
Related papers
Journal of Chemical & Engineering Data, 2002
The research on the isothermal vapor-liquid phase behavior for the ethane (R170) + hexafluoroethane (R116) system is presented in this paper. The vapor-liquid equilibrium (VLE) data were measured at four temperatures 189. 31, 192.63, 247.63 and 252.80 K with an apparatus based on recirculation method. The experimental results were correlated with the Peng-Robinson equation of state using two types of mixing rules, the Panagiotopoulos-Reid mixing rule and the Huron-Vidal mixing rule involving the NRTL model. The calculated data using the regressed parameters were compared with the previous measured results, and good agreements can be observed.
International Journal of Thermophysics, 2000
Isothermal vapor–liquid equilibria (VLE) for the binary systems of difluoromethane (HFC-32)+1,1,1,2,3,3-hexafluoropropane (HFC-236ea) and pentafluoroethane (HFC-125)+1,1,1,2,3,3-hexafluoropropane (HFC-236ea) were measured at 288.6, 303.2, and 318.2 K using an apparatus in which the vapor phase was recirculated through the liquid. The phase composition at equilibrium was measured by gas chromatography, based on calibration using gravimetrically prepared mixtures. Both systems show a slight deviation
Science and Technology of Environmental Protection, 2002
Vapor-liquid equilibrium, thermodynamic and volumetric properties were predicted for three pure hydrofluorocarbons (R32, R125 and R134a) as well as for binary mixtures of these refrigerants. Three cubic equations of state GEOS3C, SRK (Soave-Redlich-Kwong) and PR (Peng-Robinson) were used. A wide comparison with literature experimental data was made. For the binary refrigerant mixtures, classical van der Waals mixing rules without interaction parameters were used. The GEOS3C equation, with three parameters estimated by matching several points on the saturation curve (vapor pressure and corresponding liquid volumes), compares favorably to other equations in literature, resting simple enough for applications.
Fluid Phase Equilibria, 2013
The organic Rankine cycle (ORC) is one solution to recover energy from high temperature hot sources. It requires working fluid with high critical coordinate values. It is named for its use for an organic high molecular masse fluid with a liquid-vapor phase change. The knowledge of phase diagram of working fluid is a crucial task in refrigeration process. In this context, a new mixture of decafluorobutane (R3110) and 1,1,1,3,3-pentafluorobutane (R365mfc), is studied by means of experimental measurements and modeling procedures. The purpose is to obtain the isothermal vapor-liquid equilibrium data (R3110 + R365mfc) of binary system ranging from (333.26 to 441.61) K temperature, and (0.2016 to 3.0927) MPa pressure. The data were obtained with accurate within u(T, k = 2) = 0.02 K, u(P, k = 2) = 0.0003 MPa and u(z) = 0.004 for molar composition. In the present work, the static analytic method is another time investigated to achieve a high quality data as it was largely demonstrated previously by the team of our laboratories. The experimental data are correlated using the classical equations: Peng-Robinson equation of state, the Mathias-Copeman alpha function, and the Wong-Sandler mixing rules involving the NRTL model. The predicted critical line is well reproduced.
Calculation of thermodynamic properties and vapor-liquid equilibria of refrigerants
Chemical Engineering Science, 1978
A?Mract-Saturated state thermodynaimc propeNes of ref~rants are prcdrctcd from cnt~cal coordmates and normaI bodmg pomts by usmg Soave's equabon of state Bmary vapor-hquni cqtuhbna are correlated by determmmg mteraction parameters for the followmg SEX systems CC12FJCH3CHF2. CCIJ;JCHCIF~, CHF&X3F3, CClF&Xl~F, CCIZFJCCIS, CFXHS On the whole the method gves rehable results over broad temperature and pressure ranges for pracbcal engmeermg uses IN'WODUCI'ION Temperature Pressure References points range W) range (atm) klz UP (atm) uY CC12FJCH1CHF-Refrtgerant 500
Fluid Phase Equilibria, 2002
Isothermal vapor-liquid equilibrium (VLE) data for the propane + 1,1,1,2,3,3,3-heptafluoropropane (R227ea) binary system were measured at 293. 16, 303.14, 313.14, 333.15, 343.16 and 353.18 K and pressures up to 3.5 MPa. The experimental method, used in this work, is of the static-analytic type. It takes advantage of two pneumatic capillary samplers (Rolsi TM , Armines' patent) developed in the Cenerg/TEP laboratory. The peculiarity of R227ea-propane binary system is to present azeotropic behavior at each studied temperature.
Properties of Refrigerants from Cubic Equations of State
Revista de Chimie
Vapour � liquid equilibrium, thermodynamic and volumetric properties were predicted for three pure hydrofluorocarbons: difluoromethane (R32), pentafluoroethane (R125) and 1,1,1,2 � tetrafluoroethane (R134a) as well as for binary and ternary mixtures of these refrigerants. Three cubic equations of state GEOS3C, SRK (Soave � Redlich � Kwong) and PR (Peng � Robinson) were used. A wide comparison with literature experimental data was made. For the refrigerant mixtures, classical van der Waals mixing rules without interaction parameters were used. The GEOS3C equation, with three parameters estimated by matching several points on the saturation curve (vapor pressure and corresponding liquid volumes), compares favorably to other equations in literature, being simple enough for applications.
Fluid Phase Equilibria, 1993
Holcomb, C.D., Niesen, V.G., Van Poolen, L.J. and Outcalt, S.L., 1993. Coexisting densities, vapor pressures and critical densities of refrigerants R-32 and R-152a at 300-385 K. Fluid Phase Equilibria, 91: 145-157.