Experimental study ofPVT properties of HFC-125 (CHF2CF3)

Oguchi, Kosei; Murano, Atsushi; Omata, Kosuke; Yada, Naoyuki

doi:10.1007/bf01448209

Cited by 17 publications

(14 citation statements)

References 3 publications

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“…The average absolute deviations between experimental data and the equation of state are given in the tables summarizing the data. 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%

“…4.7325 Schmidt and Moldover (1994) 339.33 565. 4.7075 Singh et al (1991) 339 Gorenflo et al (1996) 25 233-337 0.061 Lee et al (2000) 3 293-313 0.167 Lüddecke and Magee (1996) 8 180-250 0.285 Magee (1996) 34 180-335 0.209 Monluc et al (1991) 23 303-339 0.056 Nagel and Bier (1993) 18 205-339 0.521 Oguchi et al (1996) 61 223-338 0.081 23 313-339 0.080 26 308-339 0.042 Tsvetkov et al (1995) 34 263-338 0.055 Weber and Silva (1994) 114 175-284 0.027 Widiatmo et al (1994) 20 219-334 0.324 Wilson et al (1992) 39 195-339 0.451 Ye et al (1995) 12 290-339 0.070 Gillis (1997) 9 240-400 1.914 Grigiante et al (2000) 7 260-360 0.934 Ye et al (1995) 11 290-390 6.397 Zhang et al (1995) 11 290-390 2.599 a Average absolute difference in the second virial coefficient (cm 3 /mol) b Data were derived from the pρT data of de Vries and are given in Table 8. Density (mol/dm 3 )…”

Section: Estimated Uncertainty Of Calculated Propertiesmentioning

confidence: 99%

“…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%

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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: Equation For the Residual Helmholtz Energymentioning

confidence: 91%

Section: Estimated Uncertainty Of Calculated Propertiesmentioning

confidence: 99%

Section: Estimated Uncertainty Of Calculated Propertiesmentioning

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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“…Then, HFC-32 in the sample supply cylinder was charged into the piezometer of HFC-125 frozen by liquid nitrogen, and finally the mass of the mixture of HFC-32 and HFC-125 was weighed precisely by the balance. This experimental method was described in other references [1,16,24,25]. Normally, density and composition distributions caused by gravity exist in the vessel.…”

Section: Experimental Methods and Uncertaintiesmentioning

confidence: 99%

“…Pressure-volume-temperature property data for HFC-125 are available in the range of temperatures from 178 to 473 K, pressures from 0.1 to 35.4 MPa, and densities from 0.26 to 1683 kg · m −3 , measured, since 1992, by Defibaugh and Morrison [10], Baroncini et al [11], Sagawa et al [12], Boyes and Weber [13], Fukushima et al [7], Tsvetkov et al [14], Ye et al [15], Magee [8], Oguchi et al [16], and Zhang et al [9].…”

Section: Pure Substances Of Hfc-32 and Hfc-125mentioning

confidence: 99%

An Experimental Study of the pVTx Properties for Binary Mixtures of HFC-32 and HFC-125 from 258 to 354 K at Pressures up to 16.9 MPa

Miyazaki

Oguchi

2005

Int J Thermophys

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An Experimental Study of the pV T x Properties for Binary Mixtures of HFC-32 and HFC-125 from 258 to 354 K at Pressures up to 16.9 MPa 1 T. Miyazaki 2 and K. Oguchi 2,3An experimental study of the pVTx properties for binary mixtures of HFC-32 (CH 2 F 2 ) and HFC-125 (C 2 HF 5 ) was conducted in the range of temperatures from 258 to 354 K, pressures up to 16.9 MPa, densities from 900 to 1400 kg·m −3 , and compositions from 0 to 1 mole fraction of HFC-32, within the uncertainties of 4.8 mK of temperatures, 1.8 kPa of pressures, 0.022% of densities, and 0.0022 mole fraction of compositions. The present results were determined with the use of a constant-volume apparatus consisting of a cylindrical vessel of approximately 173 cm 3 internal volume. The available data including the present measurements are critically compared with the equation of state developed by Tillner-Roth et al., and it is found that, in the liquid region for the range of compositions from 0.1 to 0.4 mole fraction of HFC-32, this equation of state is less reliable because of the lack of experimental data.

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