modelReverseBuoyancy

Model with four rooms and buoyancy-driven air circulation that reverses direction
Diagram of ReverseBuoyancyOpen the diagram
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Extends from Modelica.Icons.Example (Icon for runnable examples).

Information

This model is similar than Buildings.Airflow.Multizone.Validation.ThreeRoomsContam but it has four instead of three rooms. The outdoor conditions are held constant at 10°C and atmospheric pressure. All four rooms are at different temperatures, with the rooms on the bottom floor being initially at a higher temperature than the rooms on the top floor. As time progresses, the temperatures of the two rooms on the respective floors asymptotically approach each other. The bottom floor eventually cools below the temperature of the top floor, because the bottom floor directly exchanges air with the outside.

Components

TypeNameDefaultDescription
Buildings.Fluid.MixingVolumes.MixingVolumevolBotEasVolume of bottom floor, east room
Buildings.Airflow.Multizone.OrificeoriOutBotOrifice at bottom
Buildings.Airflow.Multizone.MediumColumncolOutTopMedium column to compute static pressure of air
Buildings.Airflow.Multizone.OrificeoriOutTopOrifice at top
Buildings.Airflow.Multizone.MediumColumncolEasInTopMedium column to compute static pressure of air
Buildings.Airflow.Multizone.MediumColumncolEasInBotMedium column to compute static pressure of air
Buildings.Airflow.Multizone.MediumColumncolOutBotMedium column to compute static pressure of air
MediumColumncolWesBotMedium column to compute static pressure of air
Buildings.Airflow.Multizone.OrificeoriWesTopOrifice between west rooms
Buildings.Airflow.Multizone.MediumColumncolWesTopMedium column to compute static pressure of air
Buildings.Airflow.Multizone.DoorDiscretizedOperabledooOpeCloDiscretized door
Fluid.Delays.DelayFirstOrdervolBotWesVolume of bottom floor, west room
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 rooms
Buildings.Airflow.Multizone.MediumColumncolEasTopMedium column to compute static pressure of air
Buildings.Fluid.MixingVolumes.MixingVolumevolTopEasVolume of top floor, east room
Buildings.Fluid.MixingVolumes.MixingVolumevolTopWesVolume of top floor, west room
Buildings.Airflow.Multizone.DoorDiscretizedOperabledooOpeCloTopDiscretized door
Buildings.Fluid.Sources.Boundary_pTvolOutAmbient conditions

Contents

NameDescription
Medium

Revisions

  • March 26, 2021 by Michael Wetter:
    Updated comments for IBPSA, #515.
  • May 15, 2019, by Jianjun Hu:
    Replaced fluid source. This is for #1072.
  • December 22, 2014 by Michael Wetter:
    Removed Modelica.Fluid.System to address issue #311.
  • November 10, 2011, by Michael Wetter:
    Added documentation.