COMPARATIVE ANALYSIS OF THE IAPWS-IF97 FORMULATION PERFORMANCE FOR THERMODYNAMIC PROPERTIES OF WATER ON A RANKINE CYCLE

摘要: The present paper presents the computational implementation of industrial formulation thermodynamic properties water at liquid and steam phases, proposed by International Association for Properties of Water and Steam, known as IAPWS-IF97. validity field extends over to temperatures T between 0oC 800°C, pressures p up to 100 MPa. Temperature T, specific volume v, enthalpy h, entropy s, specific heat constant pressure cp cv, besides saturation pressure ps, are calculated having a pair input values (p,T), (p,h) or (p,s). A comparative analysis IAPWS-IF97 routines and others, based on foregoing propositions, from an application Rankine cycle, is made. has proved be more precise, mainly because it accounts region compressed liquid, requiring less processing time. development carried out FORTRAN90 subroutines and functions available public use according General Public License.