.Buildings.DHC.Loads.BaseClasses.Controls.MixingValveControl

Information

This model implements a generic controller for a three-way mixing valve. Three operating modes are supported:

• Heating: the controller tracks a minimum supply temperature.
• Cooling: the controller tracks a maximum supply temperature.
• Change-over: the controller tracks either a minimum or a maximum supplied temperature depending on the actual value of the integer input modChaOve (1 for heating, 2 for cooling). The model instantiates only one PI block to limit the number of state variables in large models. Therefore the PI gain is independent from the change-over mode: the reverse action is modeled by taking the opposite value of the PI block output. Eventually the integral part is reset whenever the change-over mode is switched.

See Buildings.DHC.Loads.BaseClasses.Controls.Validation.MixingValveControl for a simulation with change-over.

Revisions

• February 21, 2020, by Antoine Gautier:
  First implementation.