.Buildings.DHC.Plants.Cooling.Controls.ChilledWaterPumpSpeed

Information

This model implements the control logic for variable speed pumps. The staging of pumps is implemented through an instance of Buildings.Applications.BaseClasses.Controls.VariableSpeedPumpStage.

The pump speed is controlled to maintain the pressure difference setpoint through a PI controller.

The model inputs are the measured chilled water mass flow rate masFloPum and the pressure difference dpMea at a reference point from the demand side. The output y is a vector of pump speeds.

The model currently only supports the control of two variable speed pumps.

Revisions

• August 9, 2023, by Hongxiang Fu:
  Restricted this block to a two-pump configuration as intended.
  • Set final totPum.nin = numPum.
  • Corrected the "up to two pumps" language in documentation.
  This is for #3470.
• December 30, 2022, by Kathryn Hinkelman:
  Added an on input for a plant-level override to turn pumps off.
• December 14, 2022 by Kathryn Hinkelman:
  Normalized u_s and u_m by dpSetPoi. Added reset for PI controller based on the number of pumps that are on.
  This is for #2912.
• August 6, 2020 by Jing Wang:
  First implementation.