.Buildings.Examples.ChillerPlant.BaseClasses.DataCenter

Information

This model is the chilled water plant with discrete time control and trim and respond logic for a data center. The model is described at Buildings.Examples.ChillerPlant.

Contents

Name	Description
MediumA	Medium model
MediumW	Medium model

Revisions

• April 27, 2026, by Michael Wetter:
  Refactored for new cooling tower implementation.
  This is for issue 4567.
• December 6, 2021, by Michael Wetter:
  Changed initialization from steady-state initial to fixed initial.
  This is for issue 2798.
• November 18, 2021, by Michael Wetter:
  Set dp_nominal for pumps and fan to a realistic value.
  This is for #2761.
• September 21, 2017, by Michael Wetter:
  Set from_dp = true in val6 and in valByp which is needed for Dymola 2018FD01 beta 2 for Buildings.Examples.ChillerPlant.DataCenterDiscreteTimeControl to converge.
• January 22, 2016, by Michael Wetter:
  Corrected type declaration of pressure difference. This is for IBPSA, #404.
• January 13, 2015 by Michael Wetter:
  Moved model to BaseClasses because the continuous and discrete time implementation of the trim and respond logic do not extend from a common class, and hence the constrainedby operator is not applicable. Moving the model here allows to implement both controllers without using a replaceable class.
• January 12, 2015 by Michael Wetter:
  Made media instances replaceable, and used the same instance for both water loops. This was done to simplify the numerical benchmarks.
• December 22, 2014 by Michael Wetter:
  Removed Modelica.Fluid.System to address issue #311.
• March 25, 2014, by Michael Wetter:
  Updated model with new expansion vessel.
• December 5, 2012, by Michael Wetter:
  Removed the filtered speed calculation for the valves to reduce computing time by 25%.
• October 16, 2012, by Wangda Zuo:
  Reimplemented the controls.
• July 20, 2011, by Wangda Zuo:
  Added comments and merge to library.
• January 18, 2011, by Wangda Zuo:
  First implementation.