This example validates the coupling of convective thermal zones with air-based HVAC systems. The model has the following three parts:
baseCase is the base case model, which is adapted from
Buildings.Examples.Tutorial.SpaceCooling.System3
to have the same flow resistances as the models that are here validated.
hvaCon and rooCon are FMU containers
that contain an HVAC system for a single zone, and a thermal model of a single
zone. Both models have the same configuration as baseCase,
but they are implemented such that the HVAC system and the thermal zone
are in separate blocks.
These blocks could be exported as an FMU, but here they are connected to each
other to validate whether they indeed give the same response as the base case
baseCase.
hvaCon2 and rooCon2 are again containers
for HVAC and room models, but the models that they encapsulate are an HVAC system
that serves two rooms, and a model of two thermal zones.
Hence, this case tests whether the FMU containers for multiple HVAC systems, and
for multiple thermal zones, are implemented correctly.
When the model is simulated, one sees that the air temperatures and the water
vapor mass fraction in all four room models are the same.
Note, however, that in Dymola 2017, the base case basCas
reaches in the last cooling cylce of the day not quite the set point, and hence
switches the cooling on time less than the other models.
We attribute this to numerical approximation errors that causes a slightly different
temperature trajectory.
With Dymola 2017, we obtain the trajectories shown below.
each keyword.