I see the following potential issues that require some analysis and/or model modification (if necessary) by Metroscope:

1. the instantiated model IsoPFlowModel is balanced because the input variable W_input has been added and put in relation with the variable W by means of the equation W = W_input. This is generally correct, the point is that the input variable W_input has no binding equation in the FlashTank model that instantiates the IsoPFlowModel model, and this is not correct because only the input variables at top-level can be left without binding,

2. probably the cause of the local unbalancing of the model is related to 1) plus the balance equation steam_phase.W + liquid_phase.W = 0 at the top-level;

Result of today's meeting with @pepmts, @casella, and @AndreaBartolini: the current structure of the model is not adequate, because the structure of the physical system does not have two parallel branches, but rather a single control volume.

It is suggested to directly write the mass and energy balance equations for such a volume (possibly in a generic base class) and then add the two extra equations fixing the saturated liquid and vapour enthalpies at the outlet ports.

This discussion also made us realize that the steam dryer was not locally balanced

@casella and @AndreaBartolini I have some difficulties in #297, the model is still not locally balanced but I don't know why, can you have a look there ?