modelStratifiedEnhancedInternalHex

Information

This is a model of a stratified storage tank for thermal energy storage with built-in heat exchanger.

See the Buildings.Fluid.Storage.UsersGuide for more information.

Limitations

The model requires at least 4 fluid segments. Hence, set nSeg to 4 or higher.

Parameters

Connectors

Components

Contents

Name	Description
MediumHex	Medium in the heat exchanger

Revisions

• June 17, 2026, by Michael Wetter:
  Updated implementation to allow a flow coefficient n that is different from 2. This allows use of the model for not fully turbulent flow.
  This is for Buildings, #4620.
• March 7, 2022, by Michael Wetter:
  Removed massDynamics and massDynamicsHex.
  This is for #1542.
• June 7, 2018 by Filip Jorissen:
  Copied model from Buildings and update the model accordingly. This is for #314.
• June 23, 2016, by Michael Wetter:
  Corrected computation of the heat exchanger location which was wrong if hHex_a < hHex_b, e.g., the port a of the heat exchanger is below the port b. This closes issue 531.
• January 22, 2016, by Michael Wetter:
  Corrected type declaration of pressure difference. This is for #404.
• July 2, 2015, by Michael Wetter:
  Set the default value energyDynamicsHexSolid=energyDynamicsHex rather than energyDynamicsHexSolid=Modelica.Fluid.Types.Dynamics.DynamicFreeInitial as users are not likely to want different settings.
• July 1, 2015, by Filip Jorissen:
  Added parameter energyDynamicsHexSolid. This is for #434.
• March 28, 2015, by Filip Jorissen:
  Propagated allowFlowReversal and m_flow_small.
• September 2, 2014 by Michael Wetter:
  Replaced the abs() function in the assignment of the parameter nSegHexTan as the return value of abs() is a Real which causes a type error during model check.
• August 29, 2014 by Michael Wetter:
  Corrected issue #271 which led to a compilation error if the heat exchanger and the tank had different media.
• April 18, 2014 by Michael Wetter:
  Added missing ceiling function in computation of botHexSeg. Without this function, this parameter can take on zero, which is wrong because the Modelica uses one-based arrays. Revised the model as the old version required the port_a of the heat exchanger to be located higher than port_b. This makes sense if the heat exchanger is used to heat up the tank, but not if it is used to cool down a tank, such as in a cooling plant. The following parameters were changed:
  1. Changed hexTopHeight to hHex_a.
  2. Changed hexBotHeight to hHex_b.
  3. Changed topHexSeg to segHex_a, and made it protected as this is deduced from hHex_a.
  4. Changed botHexSeg to segHex_b, and made it protected as this is deduced from hHex_b.
  The names of the following ports have been changed:
  1. Changed port_a1 to portHex_a.
  2. Changed port_b1 to portHex_b.
  The conversion script should update old instances of this model automatically in Dymola for all of the above changes.
• May 10, 2013 by Michael Wetter:
  Removed m_flow_nominal_tank which was not used.
• January 29, 2013 by Peter Grant:
  First implementation.