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A simple formulation for thermodynamic properties of steam from 273 to 523 K, explicit in temperature and pressure.

Author(s) : PÁTEK J., KLOMFAR J.

Type of article: Article, IJR article

Summary

This formulation completes the description of the thermodynamic properties of LiBr-H2O system, the solution properties of which are provided by the previous study of the authors. The intent of the paper is to provide potential users with a simple and easily implementable tool for calculating thermodynamic properties of steam. A Gibss energy equation is presented which was developed as an approximation of the values of the pure water vapour properties computed from the internationally accepted IAPWS formulation 1995. Explicit equations for molar volume, isobaric heat capacity, enthalpy, and entropy are given. The maximum deviations from IAPWS-95 are plus or minus 0.03% for molar volume, plus or minus 0.8% for isobaric heat capacity, plus or minus 0.7 kJ/kg (i.e. plus or minus 0.026%) for the enthalpy and less than plus or minus 0.015 kJ/kg.K (i.e. plus or minus 0.022%) for the entropy. The deviations lie within the declared maximum deviation bands at temperatures from 273 to 523 K and up to the pressure of saturation at each given temperature.

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Pages: 1123-1125

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Details

  • Original title: A simple formulation for thermodynamic properties of steam from 273 to 523 K, explicit in temperature and pressure.
  • Record ID : 2009-1564
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 5
  • Publication date: 2009/08

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