Buildings.Fluid.UsersGuide

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.