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Instructions for the flow exergy calculator


How it works

    • Currently, the flow exergy calculator only contains substance water/steam (i.e. liquid and vapour states for water as a real substance). In the future, we will incorporate more substances.
    • Select any two properties from the drop down menu, i.e. Pressure and Temperature
    • Introduce the corresponding properties in the appropriate units: pressure - bar, temperature - K, volume - m3/kg, Enthalpy - kJ/kg, Entropy kJ/kgK
    • Decimals need to be included with dots and not commas: 3.14 instead of 3,14
    • If your entered values are out of range, the programme will tell you so.
    • The calculator will provide as results the temperature, pressure, specific volume, specific internal energy, specific enthalpy, specific entropy and specific exergy of the substance.
    • The equations are obtained from Reynolds, William Craig. Thermodynamic properties in SI-graphs, tables and computational equations for 40 substances. University, Departement of mechanical engineering, 1979.



  • We would like to acknowledge Mr. Tomás Gómez for providing the necessary algorithms to implement the flow exergy calculator in Exergoecology.
  • A more advanced thermodynamic calculator for many more substances and with a graphical interface is Thermonator.
  • Here you can download Thermonator for Android.

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Ministerio de Economía y Competitividad
Ulysea S.L. - Informática

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