The Relation between Pressure, Temperature and Specific Volume of Steam at Elevated Temperatures and Pressures (Subsequent Report)

Abstract

By using the new improved apparatus and procedure mentioned in the previous report, the experiments on the relation between pressure, temperature and specific volume of steam in high temperature range up to 850°C and comparatively low pressure range up to 150kg/cm² were carried out. The experimental results are presented and discussed here. And the second and third virial coefficients of steam were determined on the basis of our results and compared with the results by the several investigators. The equation of the state of steam in the high temperature range is pressented as follows in terms of these second and third virial coefficients. [numerical formula] where, P is pressure kg/m², V is specific volume m³/kg, T=273.15+t is absolute temperature °K, t is temperature °C, R is the gas constant of steam 47.06 kg m/kg °K, B is the second virial coefficient m³/kg and C is the third virial coefficient (m³/kg )². Moreover, the equations of the several thermodynamical properties of steam are proposed, basing on this equation of state, and the relations between these thermodynamical properties and pressure and temperature numerically calculated, are shown.