Wagner et al., "The IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam," ASME J. The formulation is described in a paper by W.
IAPWS-IF97 was developed in an international research project coordinated by the International Association for the Properties of Water and Steam (IAPWS). In 1997, IFC-67 has been replaced by a new formulation, the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam or IAPWS-IF97 for short. The equations underlying IFC-97 are published for example in. Since 1967 IFC-67 has been used for "official" calculations such as performance guarantee calculations of power cycles. In this field it's also important that all parties involved, e.g., companies bidding for equipment in a new steam power plant, base their calculations on the same property data values because small differences may produce appreciable differences.Ī standard for the thermodynamic properties of water over a wide range of temperature and pressure was developed in the 1960's, the 1967 IFC Formulation for Industrial Use (IFC-67). Accurate data are especially needed for the design of equipment in steam power plants (boilers, turbines, condensers). Thermodynamic, transport and other properties of water are known better than of any other substance. That's why a good deal of work has been spent on the investigation and measurement of water properties over the years.