New Equations for the Thermodynamic Properties of Saturated Water and Steam

Abstract

New thermodynamic equations of saturation temperature, specific volume, specific enthalpy, specific entropy and specific isobaric heat capacity both for saturated water and for saturated steam were formulated for the range of temperature between the triple point of water and the critical temperature. These equations are based on the International Skeleton Tables (1963) and degree well with the property values given in the 1968 JSME Steam Tables. They also have the following features suitable for computation with electronic computation with electronic computers; (i) simple expressions in a form with pressure and temperature chosen as independent variables and short computing time needed, (ii) small amount of memory cores required, (iii) sufficient accuracy assured in computed property values within the valid region of these equations. In the present paper these new equations, the computed results of thermodynamic properties and also the comparison with those of IST (1963), and of the 1963 IFC Formulation for Industrial Use are described.