A Thermodynamic Equation of State for Pentafluoroethane (R-125)

Sunaga, Hikaru; Tillner‐Roth, Reiner; Sato, Haruki; Watanabe, Koichi

doi:10.1007/bf03344914

Cited by 25 publications

(19 citation statements)

References 18 publications

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“…Figure 11 shows comparisons with other reported second virial coefficients as well, showing good agreement between the equation of state and the values reported by de Vries (1997), Gillis (1997), and Grigiante et al (2000). Differences tend to be slightly larger around 320 to 350 K, however, the equation of Sunaga et al (1998) shows the same trends.…”

Section: Pρt Data and Virial Coefficientssupporting

confidence: 78%

“…In Tables 2 and 3 , the average deviations are less than 0.1% for the datasets of Baroncini et al (1993), Boyes and Weber (1995), de Vries (1997), Duarte-Garza and Magee (1997), Gorenflo et al (1996), Monluc et al (1991), Oguchi et al (1996), , Weber and Silva (1994), and Ye et al (1995). Comparisons with the equation of Sunaga et al (1998) Kuwabara et al (1995).…”

Section: Equation For the Residual Helmholtz Energymentioning

confidence: 91%

“…Temperature (K) Defibaugh and Morrison (1992) Higashi (1994) Kuwabara et al (1995) Magee (1996) Widiatmo et al (1994) Critical Region Equation ( Kuwabara et al (1995) Magee ( Kuwabara et al (1995) Widiatmo et al (1994) Sunaga et al (1998 Critical Region Equation ( Boyes andWeber (1995) de Vries (1997) Defibaugh and Morrison (1992) Magee (1996) Monluc et al (1991) Oguchi et al (1996) Perkins (2002) Takahashi et al (1999) Tsvetkov et al (1995) Wilson et al (1992 Ye ) Zhang et al (1996) Sunaga et al (1998 Figure 8 and Weber (1995) de Vries (1997) Defibaugh and Morrison (1992) Duarte- ) Magee (1996) Monluc et al (1991) Oguchi et al (1996 Perkins (2002) ) Takahashi et al (1999) Tsvetkov et al (1995) Wilson et al (1992) Ye et al (1995) Zhang et al (1996) Sunaga et al (1998 Monluc et al (1991) Oguchi et al (1996) Perkins (2002…”

Section: Estimated Uncertainty Of Calculated Propertiesmentioning

confidence: 99%

“…The equation of Sunaga et al (1998) is an 18-term equation explicit in the Helmholtz energy, the equation of Piao and Noguchi (1998) In addition to the equation of state, ancillary functions are given for the vapor pressure and the density of the saturated liquid and saturated vapor. These ancillary equations can be used as initial estimates in computer programs for defining the saturation boundaries, but are not required to calculate properties from the equation of state.…”

Section: Introductionmentioning

confidence: 99%

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Appendix A, An Equation of State for Pentafluoroethane (HFC-125) for Temperatures from the Triple Point (172.52 K) to 500 K and Pressures to 60 MPa

Lemmon¹,

Jacobsen²

2002

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A new formulation is presented for the thermodynamic properties of refrigerant 125 (pentafluoroethane, CHF 2 -CF 3 ) based upon available experimental data. The formulation can be used for the calculation of all the thermodynamic properties, including density, heat capacity, speed of sound, energy and saturation properties, using an equation of state explicit in Helmholtz energy. Ancillary equations are given for the ideal gas heat capacity, the vapor pressure, and for the saturated liquid and vapor densities as functions of temperature. Comparisons to available experimental data are given that establish the accuracy of calculated properties using this equation of state. The estimated uncertainties of properties calculated using the new equation are 0.1% in density, 0.5% in heat capacities, 0.01% in the speed of sound for the vapor at pressures less than 1 MPa, 0.5% in the speed of sound elsewhere, and 0.1% in vapor pressure. Deviations in the critical region are higher for all properties except vapor pressure. The equation is valid for temperatures from the triple point temperature (172.52 K) to 500 K and pressures up to 60 MPa, and can be extrapolated to 650 K.

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Section: Pρt Data and Virial Coefficientssupporting

confidence: 78%

Section: Equation For the Residual Helmholtz Energymentioning

confidence: 91%

Section: Estimated Uncertainty Of Calculated Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Appendix A, An Equation of State for Pentafluoroethane (HFC-125) for Temperatures from the Triple Point (172.52 K) to 500 K and Pressures to 60 MPa

Lemmon¹,

Jacobsen²

2002

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“…And for the calculation of the thermal conductivity over the entire range including the critical region by using Eqs. (1) to (9), the equation of state by TillnerRoth and Yokozeki [38] for R-32, that by Sunaga et al [39] for R-125, that by Tillner-Roth and Baehr [40] for R-134a, and that by Outcalt and McLinden [41] for R-143a were used. By using the equations of state mentioned above and the values of the thermal conductivity calculated from the thermal diffusivity, the term expressed by Eq.…”

Section: Thermal Conductivity In the Critical Regionmentioning

confidence: 99%

Equations for the Thermal Conductivity of R-32, R-125, R-134a, and R-143a

2005

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At present hydrofluorocarbons (HFCs) such as R32, R-125, R-134a, and R-143a are widely used, and it is required to obtain accurate information of thermophysical properties, especially of the thermal conductivity of HFCs. In this paper new thermal conductivity equations for R-32, R-125, R134a, and R143a are proposed, applicable over a wide range of temperature and pressure including the critical region based on existing experimental data, and the reliability of the present equations is summarized. The problem that the thermal conductivity calculated from the thermal diffusivity in the critical region differs depending on the equation of state is also discussed.

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Optimum Selection of Refrigerants Under Environmental Constraints

Watanabe

2003

Low Temperature and Cryogenic Refrigeration

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A Thermodynamic Equation of State for Pentafluoroethane (R-125)

Cited by 25 publications

References 18 publications

Appendix A, An Equation of State for Pentafluoroethane (HFC-125) for Temperatures from the Triple Point (172.52 K) to 500 K and Pressures to 60 MPa

Appendix A, An Equation of State for Pentafluoroethane (HFC-125) for Temperatures from the Triple Point (172.52 K) to 500 K and Pressures to 60 MPa

Equations for the Thermal Conductivity of R-32, R-125, R-134a, and R-143a

Optimum Selection of Refrigerants Under Environmental Constraints

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