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Thermodynamic Properties of Ordinary Water Substance for Industrial Use:

Auxiliary Equation for the Boundary between Regions 2 and 3

of IAPWS-IF97

Developed by Russian National Committee (RNC) of

International Association for the Properties of Water and Steam (IAPWS).

This calculation page is based on the

"Revised Release on the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam" [1] (named as IAPWS-IF97)

provided by IAPWS.

Detailed information about used equations, constants, range of validity etc is presented in PDF version of IAPWS Release which can be downloaded from IAPWS web site www.iapws.org

Authors (and responsible persons):

Moscow Power Engineering Institute (MPEI). Last update: 2013/01/14

Note that displayed last digits depends on numeric implementation of underlying formulations.

Input parameters

or

Formulation reference values

Formulation constants

Coefficients from Table 1 [1] (can be downloaded here in text format):

Dimensionless inputs

The Pressure Equation (Basic Equation)

The pressure for given temperature is represented by the equation

Eq. (5) in [1]

The Temperature Equation (Backward Equation)

The temperature for given pressure is represented by the equation

Eq. (6) in [1]

References

1. Revised Release on the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam. Lucerne, Switzerland, August 2007, available at http://www.iapws.org