Functional Forms to Describe Thermodynamic Properties of Gases for Fast Calculations

Author:

Pa´tek J.1

Affiliation:

1. Institute of Thermomechanics, Czechoslovak Academy of Sciences, Dolejsˇkova 5, 18200 Prague 8, Czech Republic

Abstract

A simple way to derive physically based functional forms for approximate description of thermodynamic properties of gases is presented. The polynomials in transformed variables obtained are intended for fast industrial calculations. The approach is applied on eleven thermodynamic dependencies with pairs of independent variables most frequently encountered in turbine calculations. These functional forms were originally derived for the description of steam properties, but they are equally applicable to any gas in adequate region of state parameters. Approximation function for the dependence T(h, s) of steam is presented as an example including the values of 18 fitted parameters.

Publisher

ASME International

Subject

Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering

Reference19 articles.

1. Campbell, J. W., and Jener, R. W., 1980, “Computational Steam/Water Property Routines for Industrial Use,” Proceedings, 9th International Conference on the Properties of Steam, J. Straub and K. Scheffler, eds., Pergamon Press, Oxford, pp. 142–149.

2. Dohrendorf E. , and SchwindtH., 1970, “Na¨herungsformeln fu¨r die Zustand-sgro¨ssen des Wasserdampfes Abha¨ngigkeit von Enthalpie und Entropie,” Brennstoff-Warme-Kraft, Vol. 22, pp. 578–583.

3. IFC, 1967, The 1967 IFC Formulation for Industrial Use, International Formulation Committee of the 6th International Conference on the Properties of Steam, ASME, New York.

4. Kretzshmar H. J. , KlingerJ., SchneiderSt., and DittmannA., 1987, “Zur Bereitstellung thermophysikalischer Stoffdaten fu¨r die Modellierung energiewandelnder Prozesse auf Personalcomputer,” Wissenshaftliche Berichte IH Zittau, Vol. 709, No. VI/5, pp. 16–22.

5. Magerfieisch J. , 1979, “Umkehrbare Gleichungen zur Berechnung von Ent-spanniingsvorga¨ngen im Wasserdampf,” Brennstoff-Warme-Kraft, Vol. 31, pp. 403–407.

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