Buildings.Fluid.UsersGuide
Buildings.Fluid.UsersGuideBuildings.Fluid consists of models
for pressure driven mass flow rate and for heat and moisture
exchange in fluid flow networks.
The models have the same interface as models of the package
Modelica.Fluid,
but have in general a simpler set of parameters that may be better
suited if the models are used in early design of building systems.
For example, in addition to the detailed pipe model from Modelica.Fluid,
this package also contains models for which a user has to specify
the mass flow and pressure drop at a nominal flow rate,
which is typically more readily available prior to the detailed
HVAC system design.
Most component models compute their pressure drop. If their pressure
drop at the rating condition is set to zero, for example by setting
the parameter value dp_nominal=0, then the
equation for the pressure drop is removed from the model.
This allows, for example,
to model a heating and a cooling coil in series, and lump their pressure drops
into a single element, thereby reducing the dimension of the nonlinear system
of equations.