Hi,

Does your simulation start? If you get an error message about the number of varaible is not the same as the number of equations then your model is either over-determinant or under. The Modelica compilers rearrange all the equations and not neccessary in the order that the users expects it.

Regards
Mohsen

The Simulation doesn't start, if i connect the necessary  Inputs   and compile I get a quite senselesse message, alleged there should miss some connections to my Medium. I know this message i get it quite often if a have forgot to use some Variables or use a wrong equation...
In Detail: Model with the 2 times the same equation: the model has the same number of unknowns and equations: 66
model+inputs(these are right for sure I have tested them allready in detail) now the compiler complains about missing equation due to missing connections to my medium....

For sure Modellica rearrangements aren't always what i expect. But 2 times one equation should lead 0 = 0 (-> neglect one of both) or to an unsolveable algebraic loop(simulation should start and stop with an error at T=0).