Vapour-liquid equilibrium of ternary mixtures of the refrigerants R125, R143a and R134a

Nagel, Matthias; Bier, K.

doi:10.1016/0140-7007(96)00001-1

Cited by 27 publications

(15 citation statements)

References 6 publications

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“…Experimental results for the vapor-liquid equilibrium for the R125/R143a mixture measured by Nagel and Bier (1996), Kleemiss (1996), Gorenflo et al (1996), andHolcomb et al (1997) were available for comparison. The bubblepoint pressure comparisons between the available VLE data and the calculated results of the Helmholtz free energy model equation of state (Lemmon and Jacobsen, 1998) 2 and shown in Figure 8 in the temperaturedensity plane.…”

Section: Resultsmentioning

confidence: 99%

“…To represent the composition dependence of the critical parameters of the system, a correlation of the critical locus was formulated. The functional form of this correlation is as follows (Higashi et al 1986;Higashi 1997Higashi , 1999: Nagel and Bier (1996); (O) Kleemiss (1996); (4) Gorenflo et al (1996); (×) Holcomb et al (1997). Here, T cm , V cm , F cm , and P cm denote the critical temperature of the mixture, the critical molar volume of the mixture, the critical density of the mixture, and the critical pressure of the mixture, respectively.…”

Section: Correlation Of the Critical Locusmentioning

confidence: 99%

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Vapor−Liquid Equilibrium, Coexistence Curve, and Critical Locus for Pentafluoroethane + 1,1,1-Trifluoroethane (R125/R143a)

Higashi

1999

J. Chem. Eng. Data

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The vapor-liquid equilibrium for pentafluoroethane (R125) + 1,1,1-trifluoroethane (R143a) was measured by the static method in the temperature range between 273.15 K and 313.15 K. The vapor-liquid coexistence curve near the critical point was measured by observation of the meniscus disappearance. The critical temperatures and critical densities of the 0.4118 and 0.6208 mole fraction of R125 were determined from the saturation densities along the coexistence curve in the critical region. In addition, the critical locus for the R125/R143a mixture is correlated as a function of composition.

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Section: Resultsmentioning

confidence: 99%

Section: Correlation Of the Critical Locusmentioning

confidence: 99%

Vapor−Liquid Equilibrium, Coexistence Curve, and Critical Locus for Pentafluoroethane + 1,1,1-Trifluoroethane (R125/R143a)

Higashi

1999

J. Chem. Eng. Data

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“…This work calculated the critical points of R-134a + R-143a mixtures to complete the calculations for three binary constituents of R-125 + R-134a + R-143a mixtures. Figure 3 shows the results and experimental values by Nagel and Bier [21] and Y. Higashi, Private communication. The predictions for T c , p c , and V c by the LJ model show good agreement with experimental values.…”

Section: R-125 + R-134a + R-143a Mixturesmentioning

confidence: 90%

“…The TR model can predict T c and p c well, but the predictions for V c deviate from the experimental values. Table 3 lists mole fractions of the ternary mixtures investigated experimentally by Nagel and Bier [21] and Fujiwara et al [22]. Only two mixtures have been investigated.…”

Section: R-125 + R-134a + R-143a Mixturesmentioning

confidence: 99%

An Assessment of Thermodynamic Models for HFC Refrigerant Mixtures Through the Critical-Point Calculation

Akasaka

2008

Int J Thermophys

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An assessment of thermodynamic models for HFC refrigerant mixtures based on Helmholtz energy equations of state was made through critical-point calculations for ternary and quaternary mixtures. The calculations were performed using critical-point criteria expressed in terms of the Helmholtz free energy. For three ternary mixtures: difluoromethane (R-32) + pentafluoroethane (R-125) + 1,1,1,2-tetrafluoroethane (R-134a), R-125 + R-134a + 1,1,1-trifluoroethane (R-143a), and carbon dioxide (CO 2 ) + R-32 + R-134a, and one quaternary mixture, R-32 + R-125 + R-134a + R-143a, calculated critical points were compared with experimental values, and the capability of the mixture models for representing the critical behavior was discussed.

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“…Among these, Nagel and Bier [207] studied the ternary VLE of the refrigerant mixtures R125, R143a and R134. Zhang et al [208] proposed a new cubic EoS and tested with difluoromethane (R±32) and pentafluoromethane (R±125).…”

Section: Vle Of Refrigerantsmentioning

confidence: 99%

Prediction of Vapor-Liquid Equilibria Using Peng-Robinson and Soave-Redlich-Kwong Equations of State

Ghosh¹

1999

Chem. Eng. Technol.

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Knowledge of vapor-liquid equilibria is essential for chemical process design. Development of algebraically simple cubic equations of state, particularly Peng-Robinson and Soave-Redlich-Kwong equations of state has encouraged vapor-liquid equilibria calculation using the equation of state approach. To extend applicability to complex mixtures, several modifications to these equations of state were proposed. Also, many new mixing rules have been developed besides the already existing ones that incorporate excess free energy models. Some of these EoS/G E models are found to be applicable to complex systems in which the components can be highly polar, differ vastly in size or may be forming association. In spite of a large number of publications on this field, this subject is still open for further research. In this article, an overview on the work done using the most successful of the cubic equations of state, i.e., Peng-Robinson and Soave-Redlich-Kwong equations of state is presented. In the later part of this article, VLE predictions (using these two equations of state) of some interesting systems like water/hydrocarbon mixtures, polymer solutions, electrolyte solutions and refrigerant mixtures are discussed. The objective is to present the available information for ready reference that will prove to be useful from a designers point of view. It is seen from the existing literature that with a proper choice of equation of state and mixing rule based on the available knowledge on the properties of the system of interest, VLE of highly complex systems can be predicted with accuracy. Several comparative studies that are cited here (and discussed) will help the designer to pick-up the right combination for the system under investigation.

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Vapour-liquid equilibrium of ternary mixtures of the refrigerants R125, R143a and R134a

Cited by 27 publications

References 6 publications

Vapor−Liquid Equilibrium, Coexistence Curve, and Critical Locus for Pentafluoroethane + 1,1,1-Trifluoroethane (R125/R143a)

Vapor−Liquid Equilibrium, Coexistence Curve, and Critical Locus for Pentafluoroethane + 1,1,1-Trifluoroethane (R125/R143a)

An Assessment of Thermodynamic Models for HFC Refrigerant Mixtures Through the Critical-Point Calculation

Prediction of Vapor-Liquid Equilibria Using Peng-Robinson and Soave-Redlich-Kwong Equations of State

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