.AixLib.Airflow.Multizone.MediumColumnDynamic

Information

This model contains a completely mixed fluid volume and models that take into account the pressure difference of a medium column that is at the same temperature as the fluid volume. It can be used to model the pressure difference caused by a stack effect.

Typical use and important parameters

Set the parameter use_HeatTransfer=true to expose a heatPort. This heatPort can be used to add or subtract heat from the volume. This allows, for example, to use this model in conjunction with a model for heat transfer through walls to model a solar chimney that stores heat.

Dynamics

For a steady-state model, use AixLib.Airflow.Multizone.MediumColumn instead of this model.

In this model, the parameter h must always be positive, and the port port_a must be at the top of the column.

Contents

Name	Description
Medium	Medium in the component
HeatTransfer	Wall heat transfer

Revisions

• February 27, 2024, by Michael Wetter:
  Removed wrong annotation that used a non-existent parameter.
  This is for #1842.
• March 7, 2022, by Michael Wetter:
  Set final massDynamics=energyDynamics.
  This is for #1542.
• January 18, 2019, by Jianjun Hu:
  Limited the media choice to moist air only. See #1050.
• January 8, 2019, by Michael Wetter:
  Changed public parameter m_flow_nominal.
  This is for #970.
• May 1, 2018, by Filip Jorissen:
  Removed declaration of allowFlowReversal and changed default density computation such that it assumes a constant pressure. See #877.
• October 6, 2014 by Michael Wetter:
  Removed assignment of port_?.p.nominal to avoid a warning in OpenModelica because alias sets have different nominal values.
• July 31, 2011 by Michael Wetter:
  Changed model to use new base class AixLib.Fluid.Interfaces.LumpedVolumeDeclarations.
• May 25, 2011 by Michael Wetter:
  Added m_flow_nominal, which is used if component is configured as steady-state.
• July 28, 2010 by Michael Wetter:
  Released first version.