modelReheat
Model that implements an on and off controller for a reheater
Information
This model can be used to generate on/off signal for the reheater inside the AHU.
This reheater will be on only if the following two conditions are satisfied at the same time:
- The position of the water-side valve reaches its switch point,
yValSwi; - The difference between the inlet temperature of the reheater and the required outlet temperature setpoint
is lower than its critical switch point,
dTSwi.
In addition, a deadband and waiting time is used to avoid frequent switching.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | yValSwi | Switch point for valve signal | |
| Real | yValDeaBan | Deadband for valve signal | |
| Modelica.Units.SI.TemperatureDifference | dTSwi | Switch point for temperature difference | |
| Modelica.Units.SI.TemperatureDifference | dTDeaBan | Deadband for temperature difference | |
| Modelica.Units.SI.Time | tWai | Waiting time |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | yVal | Valve position | |
| Modelica.Blocks.Interfaces.RealInput | dT | Temperature difference | |
| Modelica.Blocks.Interfaces.BooleanOutput | y | On and off signal for the reheater |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.StateGraph.InitialStepWithSignal | off | Off | |
| Modelica.StateGraph.StepWithSignal | on | On | |
| Modelica.StateGraph.Transition | offToOn | Conditions that switch off to on | |
| Modelica.StateGraph.Transition | onToOff | Conditions that switch on to off | |
| Modelica.StateGraph.StateGraphRoot | stateGraphRoot |
Revisions
-
September 12, 2017 by Yangyang Fu:
First implementation.