This model is identical to
Annex60.Fluid.MixingVolumes.Validation.MixingVolumeMoistureReverseFlow,
except that the steady state volume volSte is
configured to have a prescribed heat flow rate, which is in this
case zero as the heat port is not connected. This configures
volSte to use the two port steady state heat and mass
balance model
Annex60.Fluid.Interfaces.StaticTwoPortConservationEquation.