This model describes the pressure difference of a vertical medium column. It can be used to model the pressure difference caused by stack effect.
The model can be used with the following three configurations, which are
controlled by the setting of the parameter
top: Use this setting to use the density from the volume that is connected to
bottom: Use this setting to use the density from the volume that is connected to
actual: Use this setting to use the density based on the actual flow direction.
should be used when rooms or different floors of a building are
connected since multizone airflow models assume that each floor is completely mixed.
For these two seetings, this model will compute the pressure between the center of the room
and an opening that is at height
h relative to the center of the room.
actual may be used to model a chimney in which
a column of air will change its density based on the flow direction.
In this model, the parameter
h must always be positive, and the port
port_a must be
at the top of the column.
For a dynamic model, use Buildings.Airflow.Multizone.MediumColumnDynamic instead of this model.
|Medium||Medium in the component|
allowFlowReversaland changed default density computation such that it assumes a constant pressure. See #877.
Modelica.Fluid.Systemto address issue #311.
port_?.p.nominalto avoid a warning in OpenModelica because alias sets have different nominal values.