.Modelica.Media.Water.IF97_Utilities.BaseIF97.Basic.p2c_hs

Information

Equation number 5 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 p2c_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 = {0.112225607199012, -0.339005953606712e1, -0.320503911730094e2, -0.197597305104900e3, -0.407693861553446e3, 0.132943775222331e5, 0.170846839774007e1, 0.373694198142245e2, 0.358144365815434e4, 0.423014446424664e6, -0.751071025760063e9, 0.523446127607898e2, -0.228351290812417e3, -0.960652417056937e6, -0.807059292526074e8, 0.162698017225669e13, 0.772465073604171, 0.463929973837746e5, -0.137317885134128e8, 0.170470392630512e13, -0.251104628187308e14, 0.317748830835520e14, 0.538685623675312e2, -0.553089094625169e5, -0.102861522421405e7, 0.204249418756234e13, 0.273918446626977e9, -0.263963146312685e16, -0.107890854108088e10, -0.296492620980124e11, -0.111754907323424e16};
  constant Real[:] I = {0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 5, 5, 5, 5, 6, 6, 10, 12, 16};
  constant Real[:] J = {0, 1, 2, 3, 4, 8, 0, 2, 5, 8, 14, 2, 3, 7, 10, 18, 0, 5, 8, 16, 18, 18, 1, 4, 6, 14, 8, 18, 7, 7, 10};
  constant SI.SpecificEnthalpy hstar = 3500e3 "Normalization enthalpy";
  constant SI.Pressure pstar = 100e6 "Normalization pressure";
  constant SI.SpecificEntropy sstar = 5.9e3 "Normalization entropy";
end p2c_hs;