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  • 1995-1999  (4)
  • 1935-1939
  • second virial coefficient  (3)
  • equation of state  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Ideal-gas specific heat and second virial coefficient of HFC-125 based on sound-velocity measurements (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 587-595 
    Details
    ISSN: 1572-9567
    Keywords: alternative refrigerant ; HFC-125 ideal-gas specific heat ; second acoustic-virial coefficient ; second virial coefficient ; sound velocity ; spherical resonator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The sound velocity in gaseous pentafluoroethane (HFC-125, CF3CHF2) has been measured by means of a spherical acoustic resonator, Seventy-two sound-velocity values were measured with an uncertainty of ±0.01% at temperatures from 273 to 343 K and pressures from 101 to 250 kPa. The ideal-gas specific heats and the second acoustic-virial coefficients have been determined on the basis of the Sound-velocity measurements. The second virial coefficients calculated from the present sound-velocity measurements agree with literature values which were determined fromPVT measurements by means of a Burnett method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441505
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Calculation of second virial coefficients and gaseous viscosities of the refrigerants HFC-32 (CH2 F2), HFC-23 (CHF3), and HCFC-22 (CHC1F2) (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 1269-1280 
    Details
    ISSN: 1572-9567
    Keywords: alternative refrigerants ; collision integrals ; second virial coefficient ; spherically averaged potential ; viscosite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The second virial coefficients of refrigerants HFC-32 (CH2F2), HFC-23 (CHF3), and HCFC-22 (CHC1F2) have been correlated on the bisis of site site model potential and have been compared with experimental results. The molecular interactions consisted of repulsion dispersion and electrostatic parts. From the site site potentials adjusted to the experimental second virial coefficients, spherically averaged potentials have been determined and a subsequent calculation of gaseous viscosity has been carried out. Agreement between measured and calculated values of second virial coellicients and gaseous viscosity is satisfactory. Calculated values of second virial coefficients and gaseous viscosity beyond available experimental data, therefore. can be assumed as a reliable extrapolation to lower and higher temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438669
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An Equation of State for 1,1,1-Trifluoroethane (R-143a) (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1639-1651 
    Details
    ISSN: 1572-9567
    Keywords: alternative refrigerant ; equation of state ; Helmholtz energy ; R-143a ; 1,1,1-trifluoroethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A fundamental equation of state has been developed for 1,1,1-trifluoroethane (R-143a) using the dimensionless Helmholtz energy. The experimental thermodynamic property data, which cover temperatures from the triple point (161 K) to 433 K and pressures up to 35 MPa, are used to develop the present equation. These data are represented by the present equation within their reported experimental uncertainties: ±0.1% in density for both vapor and liquid phase P–ρ–T data, ±1% in isochoric specific heat capacities, and ±0.02% in the vapor phase speed-of-sound data. The extended range of validity of the present model covers temperatures from 160 to 650 K and pressures up to 50 MPa as verified by the thermodynamic behavior of the isobaric heat-capacity values over the entire fluid phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022645626800
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of Second Virial Coefficients and Virial Equations of R-32 (Difluoromethane) and R-125 (Pentafluoroethane) Based on Speed-of-Sound Measurements (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1677-1688 
    Details
    ISSN: 1572-9567
    Keywords: alternative refrigerant ; equation of state ; hydrofluorocarbon ; R-32 ; R-125 ; second virial coefficient ; speed of sound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The second virial coefficients, B, for difluoromethane (R-32, CH2F2) and pentafluoroethane (R-125, CF3CHF2) are derived from speed-of-sound data measured at temperatures from 273 to 343 K with an experimental uncertainty of ±0.0072%. Equations for the second virial coefficients were established, which are valid in the extensive temperature ranges from 200 to 400 K and from 240 to 440 K for R-32 and R-125, respectively. The equations were compared with theoretically derived second virial coefficient values by Yokozeki. A truncated virial equation of state was developed using the determined equation for the virial coefficients. The virial equation of state represents our speed-of-sound data and most of the vapor PρT data measured by deVries and Tillner-Roth within ±0.01 and ±0.1%, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022601811779
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    Paper (German National Licenses)
    Fulltext
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