modelReverseBuoyancy3Zones

Model with three rooms and buoyancy-driven air circulation that reverses direction
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Extends from Modelica.Icons.Example (Icon for runnable examples).

Information

This model is similar than Buildings.Airflow.Multizone.Validation.ThreeRoomsContam. However, the initial temperatures are such that at the start of the simulation, the flow direction between the three rooms reverses direction.

At the start of the simulation, the outdoor temperature is 15°C, and the temperatures of the volumes are 20°C at the top, 22°C at the bottom west and 25°C at the bottom east. Thus, initially there is a net flow circulation in the counter-clock direction. Because the volume on the east exchanges air with the outside, it cools down fast. Once it cooled down sufficiently, the flow direction between the three rooms reverses because the air in the bottom east is heaviest.

Components

TypeNameDefaultDescription
Buildings.Fluid.MixingVolumes.MixingVolumevolEasControl volume for east room
Buildings.Airflow.Multizone.OrificeoriOutBotOrifice at bottom of east room
Buildings.Airflow.Multizone.MediumColumncolOutTopMedium column to compute static pressure of air
Buildings.Airflow.Multizone.OrificeoriOutTopOrifice at top of east room
Buildings.Airflow.Multizone.MediumColumncolEasInTopMedium column to compute static pressure of air
Buildings.Fluid.MixingVolumes.MixingVolumevolOutControl volume for outside
Buildings.Airflow.Multizone.MediumColumncolEasInBotMedium column to compute static pressure of air
Buildings.Airflow.Multizone.MediumColumncolOutBotMedium column to compute static pressure of air
Buildings.Airflow.Multizone.MediumColumncolWesBotMedium column to compute static pressure of air
Buildings.Airflow.Multizone.OrificeoriWesTopOrifice between west room and top
Buildings.Airflow.Multizone.MediumColumncolWesTopMedium column to compute static pressure of air
Buildings.Airflow.Multizone.DoorDiscretizedOperabledooOpeCloDiscretized door
Modelica.Blocks.Sources.ConstantopeConstant signal for door opening
Buildings.Airflow.Multizone.MediumColumncol1EasBotMedium column to compute static pressure of air
Buildings.Airflow.Multizone.OrificeoriEasTopOrifice between east room and top
Buildings.Airflow.Multizone.MediumColumncolEasTopMedium column to compute static pressure of air
Buildings.Fluid.MixingVolumes.MixingVolumevolTopControl volume for top floor room
Buildings.Fluid.MixingVolumes.MixingVolumevolWesControl volume for west room

Contents

NameDescription
Medium

Revisions

  • March 26, 2021 by Michael Wetter:
    Updated comments for IBPSA, #515.
  • December 22, 2014 by Michael Wetter:
    Removed Modelica.Fluid.System to address issue #311.
  • November 10, 2011, by Michael Wetter:
    Added documentation.