Issues with Modelica.Media.Incompressible.TableBased.T_ph

[HansOlsson]

In Modelica.Media.Incompressible.TableBased.BaseProperties we have:
h = if enthalpyOfT then h_T(T) else h_pT(p,T,densityOfT);
assumedly that implies that if enthalphyOfT is true we should ignore the pressure-part of the enthalphy.

If we now look at T_ph we find:

function T_ph "Compute temperature from pressure and specific enthalpy"
 ...
protected 
  function f_nonlinear "Solve h_T(T) or h_pT(p,T) for T with given h"
   ...
  algorithm 
    y := (if singleState then h_T(T=u) else h_pT(p=p, T=u)) - h;
  end f_nonlinear;
..
  annotation(Inline=false, LateInline=true, inverse(h=h_pT(p,T)));
end T_ph;

Which has the following issues:

• When computing T_ph we ignore the pressure-dependency on enthalphy when a different constant, singleState, whereas BaseProperties ignores it when enthalphOfT is true. (In BaseProperties singleState is used to ignore pressure influence on u.)
• The inverse always include the pressure-dependency, regardless of this.

Note that h_pT doesn't just magically ignore the pressure-dependency.

Modelica.Media.Incompressible.Examples.Essotherm650.h_T(290)=30408
Modelica.Media.Incompressible.Examples.Essotherm650.h_pT(1e5, 290)=30407
Modelica.Media.Incompressible.Examples.Essotherm650.h_pT(1.1e5, 290)=30418