modelNaturalVentilation
Model with flow reversal due to density difference
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
This model illustrates buoyancy-driven natural ventilation between
two volumes of air.
The volume volA can be considered as the volume of a room,
and the volume volOut is parameterized to be very large to emulate
outside air.
The outside air is 20°C and at initial time, the room air is
18°C.
This induces an airflow in counter clock-wise direction. Since
heat is added to the room air volume, its temperature raises above the temperature of the outside, which causes the air flow to reverse its direction.
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Fluid.MixingVolumes.MixingVolume | volA | Control volume | |
| Buildings.Airflow.Multizone.Orifice | oriOutBot | Orifice | |
| Buildings.Airflow.Multizone.MediumColumn | colOut | Medium column to compute static pressure of air | |
| Buildings.Airflow.Multizone.Orifice | oriOutTop | Orifice | |
| Buildings.Airflow.Multizone.MediumColumn | colRooTop | Medium column to compute static pressure of air | |
| Buildings.Fluid.MixingVolumes.MixingVolume | volOut | Control volume | |
| Modelica.Thermal.HeatTransfer.Sources.PrescribedHeatFlow | preHeaFlo | Prescribed heat flow rate boundary condition | |
| Modelica.Blocks.Sources.Step | q_flow | Step function for heat flow boundary condition |
Contents
| Name | Description |
|---|---|
 Medium |
Revisions
-
March 26, 2021 by Michael Wetter:
Updated comments for IBPSA, #515. -
December 22, 2014 by Michael Wetter:
RemovedModelica.Fluid.Systemto address issue #311. -
November 10, 2011, by Michael Wetter:
Added documentation.