modelSystem6

Information

In this step, we added the last controller, which is controlling the mixing valve for the radiator supply water temperature.

Implementation

This model was built as follows:

1. First, we copied the controller Buildings.Examples.Tutorial.CDL.Controls.OpenLoopRadiatorSupply to create the block Buildings.Examples.Tutorial.CDL.Controls.RadiatorSupply.

2. In this new block, we used Buildings.Controls.OBC.CDL.Reals.Line to compute the set point for the supply water temperature based on the room air temperature. This set point is then used in a PI controller Buildings.Controls.OBC.CDL.Reals.PID to modulate the mixing valve position in order to track the supply water temperature set point.

3. To allow configuring the temperatures and the control gains, we exposed the main parameters of the controller, see Buildings.Examples.Tutorial.CDL.Controls.RadiatorSupply.

4. We also implemented the open loop validation Buildings.Examples.Tutorial.CDL.Controls.Validation.RadiatorSupply to ensure that the controller is implemented correctly.

Exercise

Create a model, such as this model. To do so,

1. Copy Buildings.Examples.Tutorial.CDL.System5.

2. Implement the controller for the radiator supply water temperature control.

   Make a small unit test to verify that the controller is implemented correctly.

3. Use this new controller instead of the open loop controller conRadSup.

Simulate the system to verify that the mixing valve conRadSup is modulated and the room air temperature temRoo.T is well tracked.

Components

Revisions

• February 18, 2020, by Michael Wetter:
  First implementation.