blockHighMassSupplyTemperature_TRoom
Information
Controller for a radiant heating system.
The controller tracks the room temperature set point TRooSet by
adjusting the supply water temperature set point TSupSet linearly between
TSupSetMin and TSupSetMax
based on the output signal y of the proportional controller.
The pump is either off or operates at full speed, in which case yPum = 1.
The pump control is based on a hysteresis that switches the pump on when the output of the
proportional controller y exceeds 0.2, and the pump is commanded off when the output falls
below 0.1. See figure below for the control charts.
For systems with high thermal mass, this controller should be left configured as a P-controller, which is the default setting. PI-controller likely saturate due to the slow system response.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | TSupSet_max | Maximum heating supply water temperature | |
| Real | TSupSet_min | 293.15 | Minimum heating supply water temperature |
| Control gains | |||
| Controls.OBC.CDL.Types.SimpleController | controllerType | Buildings.Controls.OBC.CDL.Types.SimpleController.P | Type of controller |
| Real | k | 2 | Gain of controller |
| Real | Ti | 3600 | Time constant of integrator block |
| Real | Td | 0.1 | Time constant of derivative block |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Controls.OBC.CDL.Interfaces.RealInput | TRooSet | Set point for room air temperature | |
| Controls.OBC.CDL.Interfaces.RealInput | TRoo | Measured room air temperature | |
| Controls.OBC.CDL.Interfaces.RealOutput | TSupSet | Set point for heating supply water temperature | |
| Controls.OBC.CDL.Interfaces.RealOutput | y | Control signal for heating system from P controller | |
| Controls.OBC.CDL.Interfaces.BooleanOutput | on | Outputs true if the system is demanded on | |
| Controls.OBC.CDL.Interfaces.RealOutput | yPum | Pump speed control signal |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Controls.OBC.CDL.Reals.PID | conHea | Controller for heating supply set point signal | |
| Buildings.Controls.OBC.CDL.Reals.Hysteresis | hysHea | Hysteresis to switch system on and off |
Revisions
-
August 26, 2021, by Michael Wetter:
First implementation.