************************************************************************************* * Compilation of Experimental Data Used to Develop * * * * The IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water * * Substance for General and Scientific Use * ************************************************************************************* These data were compiled at the Chair of Thermodynamics Ruhr-Universitaet Bochum D-44780 Bochum, Germany The compilation is based on the information given in the article Wagner, W. and Pruß, A., The IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use. J. Phys. Chem. Ref. Data 31 (2002), 387-535. The folders in the directory contain the experimental data for different thermodynamic properties which were used to develop the IAPWS-95 formulation. Only the selected points are listed (see Tables 4.1 to 4.9 of article on IAPWS-95 mentioned above). The following properties are included (see Table 5.4 of the article on IAPWS-95): Type of data Referred to as For details see -------------------------------------------------------------------------------- Thermal properties p-rho-T Table 4.4 Vapour pressure psigma Table 4.1 Saturated liquid density dl Table 4.1 Saturated vapour density dv Table 4.1 Isochoric heat capacity cv Table 4.6 Isobaric heat capacity cp Table 4.8 Isobaric heat capacity of the saturated liquid cpl Table 4.3 Isobaric heat capacity of the saturated vapour cpv Table 4.3 Speed of sound w Table 4.5 Speed of sound of the saturated liquid wl Table 4.3 Speed of sound of the saturated vapour wv Table 4.3 Enthalpy differences dh Table 4.9 Joule-Thomson coefficient jt Table 4.9 Isothermal throttling coefficient dt Table 4.9 In some directories are subfolders called "comparison". They contain data which were only available after the development of the IAPWS-95 formulation had been finished. These data were used to check how IAPWS-95 represents these data of the corresponding thermodynamic properties. Calculated values of different properties as listed in Table 5.4 were not included in this compilation. In only a few datasets there are small differences between the number of data given in the tables mentioned above and the number of data available in the datafiles. These datasets are listed below. Type of data Reference Number of data Number of data given in the table available on CD ------------------------------------------------------------------------------------ p-rho-T Masui et al. (1995) 2 19 (see footnote) dl Osborne et al. (1937) 29 28 cv Magee et al. (1998) 278 272 ------------------------------------------------------------------------------------ Footnote: Calculated data from an equation given in the reference. According to the data used when developing IAPWS-95 the number of significant figures given for temperatures of the saturated properties and of the properties in the homogeneous region are different.