.Buildings.Applications.DataCenters.ChillerCooled.Examples.BaseClasses.PartialDataCenter

Information

This is a partial model that describes the chilled water cooling system in a data center. The sizing data are collected from the reference.

Reference

• Taylor, S. T. (2014). How to design & control waterside economizers. ASHRAE Journal, 56(6), 30-36.

Contents

Name	Description
MediumA	Medium model
MediumW	Medium model

Revisions

• January 2, 2022, by Kathryn Hinkelman:
  Passed the plaOn signal to the chilled water pump control to turn them off when the plant is off.
• November 16, 2022, by Michael Wetter:
  Corrected control to avoid cooling tower pumps to operate when plant is off, because shut-off valves are off when plant is off.
• November 1, 2021, by Michael Wetter:
  Corrected weather data bus connection which was structurally incorrect and did not parse in OpenModelica.
  This is for issue 2706.
• October 6, 2020, by Michael Wetter:
  Set val.use_inputFilter=false because pump worked against closed valve at t=60 seconds, leading to negative pressure at pump inlet (because pump forces the mass flow rate).
• January 12, 2019, by Michael Wetter:
  Removed wrong each.
• December 1, 2017, by Yangyang Fu:
  Used scaled differential pressure to control the speed of pumps. This can avoid retuning gains in PID when changing the differential pressure setpoint.
• September 2, 2017, by Michael Wetter:
  Changed expansion vessel to use the more efficient implementation.
• July 30, 2017, by Yangyang Fu:
  First implementation.