blockFreezeProtectionMixedAir
Freeze protection based on mixed air temperature
Information
Block that tracks the mixed air temperature TMix
using a PI controller and outputs
a freeze protection control signal yFrePro and
its inverse yFreProInv.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Controls.OBC.CDL.Types.SimpleController | controllerType | Buildings.Controls.OBC.CDL.Types.SimpleController.PI | Type of controller |
| Real | k | 0.1 | Gain |
| Real | Ti | 120 | Time constant of integrator block |
| Real | Td | 0.1 | Time constant of derivative block |
| Real | TFreSet | 279.15 | Lower limit for mixed air temperature for freeze protection |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | TMix | Mixed air temperature measurement | |
| Buildings.Controls.OBC.CDL.Interfaces.RealOutput | yFrePro | Freeze protection control signal, 0 if no frost, 1 if TMix below TFreSet | |
| Buildings.Controls.OBC.CDL.Interfaces.RealOutput | yFreProInv | Inverse freeze protection control signal, 1 if no frost, 0 if TMix below TFreSet | |
| Buildings.Controls.OBC.CDL.Reals.PID | con | Controller for mixed air to track freeze protection set point |
Revisions
-
November 2, 2017, by Milica Grahovac:
First implementation.