IAPWS-IF97 improves significantly both accuracy and speed of the calculation of the thermodynamic properties compared with IFC-67. The new Industrial formulation replaces the previous industrial formulation, IFC-67, that had formed the basis for power-plant calculation and other applications in energy engineering since the late 1960's. "The IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam (IAPWS-IF97)".In 1997, the International Association for the Properties of Water and Steam (IAPWS) adopted a new formulation for the thermodynamic properties of water and steam for industrial use.
Because of that IAPWS-IF97 was developed, to provide almost as accurate results, but at a much faster speed. However, since the independent variables of IAPWS-95 are temperature and density, computing times for some applications may be excessive. Thus IAPWS-95 is recommended as the source of the thermodynamic properties of water and steam. IAPWS-95 defines accurately the thermodynamic properties of ordinary water substance, with complete thermodynamic consistency between these properties, over a wide range of states.
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IAPWS-95 is a fundamental equation of Helmholtz free energy as a function of temperature and density, which yields other thermodynamic properties by differentiation and algebraic manipulation without the use of any other information. This new formulation, called IAPWS-95, provides the most accurate representation of the thermodynamic properties of the fluid phases of water substance over a wide range of conditions.
The steam tables application calculates 32 thermodynamic and transport properties of water and steam. Thermodynamic and Transport Properties of Water and Steam
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