blockSupplySignals
Information
Block that outputs the supply temperature control loop signal, and the coil valve postions for VAV system with multiple zones, implemented according to the ASHRAE Guideline G36, PART 5.N.2 (Supply air temperature control).
The supply air temperature control loop signal uTSup
is computed using a PI controller that tracks the supply air temperature
setpoint TSupSet.
If the fan is off, then uTSup = 0.
Heating valve control signal (or modulating electric heating
coil if applicable) yHea and cooling valve control signal yCoo
are sequenced based on the supply air temperature control loop signal uTSup.
From uTSup = uHeaMax to uTSup = -1,
yHea increases linearly from 0 to 1.
Similarly, uTSup = uCooMin to uTSup = +1,
yCoo increases linearly from 0 to 1.
The output uTSup can be used in a controller for the economizer.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Controls.OBC.CDL.Types.SimpleController | controllerType | Buildings.Controls.OBC.CDL.Types.SimpleController.PI | Type of controller for supply air temperature signal |
| Real | kTSup | 0.05 | Gain of controller for supply air temperature signal |
| Real | TiTSup | 600 | Time constant of integrator block for supply temperature control signal |
| Real | TdTSup | 0.1 | Time constant of derivative block for supply temperature control signal |
| Real | uHeaMax | -0.25 | Upper limit of controller signal when heating coil is off. Require -1 < uHeaMax < uCooMin < 1. |
| Real | uCooMin | 0.25 | Lower limit of controller signal when cooling coil is off. Require -1 < uHeaMax < uCooMin < 1. |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | TSup | Measured supply air temperature | |
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | TSupSet | Setpoint for supply air temperature | |
| Buildings.Controls.OBC.CDL.Interfaces.BooleanInput | uSupFan | Supply fan status | |
| Buildings.Controls.OBC.CDL.Interfaces.RealOutput | yHea | Control signal for heating | |
| Buildings.Controls.OBC.CDL.Interfaces.RealOutput | yCoo | Control signal for cooling | |
| Buildings.Controls.OBC.CDL.Interfaces.RealOutput | uTSup | Supply temperature control signal |
Revisions
-
November 1, 2017, by Jianjun Hu:
First implementation.