.Modelica.Media.Water.IF97_Utilities.BaseIF97.Basic.p1_hs

Information

Equation number 1 from:
The International Association for the Properties of Water and Steam
Gaithersburg, Maryland, USA
September 2001
Supplementary Release on  Backward Equations for Pressure as a Function of Enthalpy and Entropy p(h,s) to the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam

Interface

function p1_hs
  extends Modelica.Icons.Function;
  input SI.SpecificEnthalpy h "Specific enthalpy";
  input SI.SpecificEntropy s "Specific entropy";
  output SI.Pressure p "Pressure";
  constant Real[:] n = {-0.691997014660582, -0.183612548787560e2, -0.928332409297335e1, 0.659639569909906e2, -0.162060388912024e2, 0.450620017338667e3, 0.854680678224170e3, 0.607523214001162e4, 0.326487682621856e2, -0.269408844582931e2, -0.319947848334300e3, -0.928354307043320e3, 0.303634537455249e2, -0.650540422444146e2, -0.430991316516130e4, -0.747512324096068e3, 0.730000345529245e3, 0.114284032569021e4, -0.436407041874559e3};
  constant Real[:] I = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 3, 4, 4, 5};
  constant Real[:] J = {0, 1, 2, 4, 5, 6, 8, 14, 0, 1, 4, 6, 0, 1, 10, 4, 1, 4, 0};
  constant SI.SpecificEnthalpy hstar = 3400e3 "Normalization enthalpy";
  constant SI.Pressure pstar = 100e6 "Normalization pressure";
  constant SI.SpecificEntropy sstar = 7.6e3 "Normalization entropy";
end p1_hs;