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  • 1
    Electronic Resource
    Electronic Resource
    An interim analytic equation of state for sulfurhexafluoride (1990)
    Springer
    International journal of thermophysics 11 (1990), S. 189-199 
    Details
    ISSN: 1572-9567
    Keywords: equation of state ; saturation properties ; Sulfurhexafluoride ; thermodynamic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An interim analytic equation of state for Sulfurhexafluoride is given in the form of a reduced Helmholtz energy function. It represents the thermodynamic properties over the temperature range 222.38 to 525 K for pressures up to 55 MPa. The data selected for determining the linear coefficients of the equation are given, which includes some values predicted using the principle of corresponding states. The method used for the multiproperty fitting is given and, in particular, the functions used for fitting isobaric heat capacities as primary data. Comparisons with values predicted by the equation of state are given for saturation properties, second virial coefficients, densities, and isobaric and isochoric heat capacities. The accuracy of the representation of the equation of state is discussed and, also, the problems arising from inconsistencies between the different data sets. The interim status of this equation of state is due to these inconsistencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503870
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  • 2
    Electronic Resource
    Electronic Resource
    The selection of international standards for the thermodynamic properties of HFC-134a and HCFC-123 (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 781-790 
    Details
    ISSN: 1572-9567
    Keywords: environmentally acceptable refrigerants ; equation of state ; thermodynamic properties ; international standards
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The objectives and activities of the International Energy Agency-Annex 18 are summarized. One of the goals of the Annex was to determine the formulations that best represent the thermodynamic properties of HFC-134a and HCFC-123. The formulations selected were those which accurately represented the experimental data and simultaneously exhibited thermodynamic consistency. Methods of comparison include analysis of the experimental data, statistical comparisons of values calculated from the property formulations to experimental values, and graphical analyses of the thermodynamic surface. The analytical methods used are summarized in this paper. The equations of state reviewed in these comparisons represented the most accurate formulations available in December 1992. Four equations of state were reviewed for HFC-I34a and three equations of state were considered for HCFC-123. These equations represented the work of independent researchers in Germany, Japan, and the United States. The formulations selected as international standards are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438863
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ideal-gas and saturation properties of methanol (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 541-552 
    Details
    ISSN: 1572-9567
    Keywords: critical point ; density ; heat capacity ; ideal gas ; methanol ; saturation curve ; triple point ; vapor pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Properties of the ideal gas have been considered in detail and new equations for the ideal-gas heat capacity enthalpy, and entropy are given which are valid from 100 to 1000 K. Saturation-curve data have been reviewed and an equation for the vapor pressure is given which covers the whole range from the triple point to the critical point. A tentative equation for the saturated liquid density is also given. The necessity for new experimental measurements is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502388
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  • 4
    Electronic Resource
    Electronic Resource
    Thermophysical property predictions from the software package EOSMIX (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 1251-1259 
    Details
    ISSN: 1572-9567
    Keywords: corresponding states ; methane-ethane ; methane-propane ; mixing rules ; mixture predictions ; two-fluid model ; thermodynamic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A two-fluid corresponding-states model for predicting the thermodynamic properties of mixtures has been developed, which uses accurate equations of state for the reference substances of the components. A new mixing parameter has been introduced, which takes account of the differences in molecular sizes in binary fluid mixtures. The three mixing parameters for methane-ethane and methane-propane have been optimized using different types of experimental data. Comparisons of predictions with data are given for experimental densities and speed of sound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01458833
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The Imperial College Thermophysical Properties Data Centre (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 963-971 
    Details
    ISSN: 1572-9567
    Keywords: data compilation ; review ; thermophysical properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The IUPAC Thermodynamic Tables Project Centre in London has at its disposal considerable expertise on the production and utilization of high-accuracy equations of state which represent the thermodynamic properties of substances. For some years they have been content to propagate this information by the traditional method of book production, but the increasing use of the computer in industry for process design has shown that an additional method was needed. The setting up of the IUPAC Transport Properties Project Centre, also at Imperial College, whose products would also be in demand by industry, afforded the occasion for a new look at the problem. The solution has been to set up the Imperial College Thermophysical Properties Data Centre, which embraces the two IUPAC Project Centres, and for it to establish a link with the existing Physical Properties Data Service of the Institution of Chemical Engineers, thus providing for the dissemination of the available information without involving the Centres in problems such as those of marketing and advertising. This paper outlines the activities of the Centres and discusses the problems in bringing their products to the attention of industry in suitable form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503851
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Toward an analytic equation of state for fluorine (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 375-386 
    Details
    ISSN: 1572-9567
    Keywords: equation of state ; fluorine ; ideal-gas properties ; multiproperty fitting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract There are more than 1000 good experimental measurements of fluid fluorine, which cover the range from the triple point to 300 K for pressures up to 23 MPa. The development of an equation of state to fit these data is described. The form of equation used is that of a reduced Helmholtz energy function which includes an equation to represent the behavior of the ideal gas. The coefficients in the equation are determined by a least-squares method where the terms used are selected statistically from a given bank, thus reducing intercorrelation. Two banks of terms were chosen and various fits made using PρT data alone, and multiproperty fits with both banks. The serious consequence of using PρT data alone is demonstrated, and the difference in quality between the two banks is described. The problems of inconsistency between the single-phase and the saturated density data are discussed. New equations are given which represent the ideal-gas properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503949
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    Paper (German National Licenses)
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