Mixing volume with a heat port.
This model is identical to IBPSA.Fluid.MixingVolumes.BaseClasses.PartialMixingVolume, except that it has a heat and a moisture port.
Note that this model is typically only used to implement new
component models that have staggered volumes. In contrast to
IBPSA.Fluid.MixingVolumes.MixingVolumeMoistAir, it does not set
initialize_p to final in order for this
model to be usable in staggered volumes which require one pressure
to be set to initialize_p = not Medium.singleState and
all others to false.