blockUp
Generates a stage up signal
Information
Outputs a boolean stage up signal y based on the various plant
operation conditions that get provided as input signals.
It is implemented according to Guideline 36-2021, section 5.20.4.15 and applies to
primary-only plant with and without a WSE.
The stage up signal becomes true when:
- Current stage becomes unavailable, or
- Efficiency condition is true, or
- Failsafe condition is true.
If have_WSE boolean flag is true, staging up from WSE only to the first
available stage occurs when the chilled water supply temperature is sufficienctly
above its setpoint for either a shorter or a longer time period
Note that when the plant is enabled in chiller mode, the stage up signal will remain false. The plant will control by the Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Generic.PlantEnable.Enable.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | have_WSE | true | true = plant has a WSE, false = plant does not have WSE |
| Boolean | have_serChi | false | true = series chillers plant; false = parallel chillers plant |
| Boolean | have_senDpChiWatRemWir | true | True=remote DP sensor hardwired to controller |
| Integer | nRemSen | 2 | Total number of remote differential pressure sensors |
| Real | effConTruDelay | 900 | Enable delay for efficiency condition |
| Real | faiSafTruDelay | 900 | Enable delay for failsafe condition |
| Real | shortTDelay | 600 | Short enable delay for staging from zero to first available stage up |
| Real | longTDelay | 1200 | Long enable delay for staging from zero to first available stage up |
| Real | faiSafTDif | 1 | Offset between the chilled water supply temperature and its setpoint |
| Real | TDifHys | 1 | Hysteresis deadband for temperature |
| Real | smallTDif | 1 | Offset between the chilled water supply temperature and its setpoint for the long condition |
| Real | largeTDif | 2 | Offset between the chilled water supply temperature and its setpoint for the short condition |
| Real | faiSafDpDif | 2*6895 | Offset between the chilled water differential pressure and its setpoint |
| Real | dpDifHys | 0.5*6895 | Pressure difference hysteresis deadband |
| Real | effConSigDif | 0.05 | Signal hysteresis deadband |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Controls.OBC.CDL.Interfaces.BooleanInput | uAvaCur | Current stage availability status | |
| Buildings.Controls.OBC.CDL.Interfaces.IntegerInput | u | Chiller stage | |
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | uOpe | Operating part load ratio of the current stage | |
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | uStaUp | Staging part load ratio of the next stage up | |
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | dpChiWatSet_local | Chilled water local diferential static pressure setpoint | |
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | dpChiWat_local | Chilled water diferential static pressure from local sensor | |
| Buildings.Controls.OBC.CDL.Interfaces.RealInput[nRemSen] | dpChiWatSet_remote | Chilled water remote differential pressure setpoint | |
| Buildings.Controls.OBC.CDL.Interfaces.RealInput[nRemSen] | dpChiWat_remote | Chilled water differential pressure from remote sensor | |
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | TChiWatSupSet | Chilled water supply temperature setpoint | |
| Buildings.Controls.OBC.CDL.Interfaces.RealInput | TChiWatSup | Chilled water supply temperature | |
| Buildings.Controls.OBC.CDL.Interfaces.BooleanInput | uPla | Plant enable signal | |
| Buildings.Controls.OBC.CDL.Interfaces.BooleanOutput | y | Stage up signal |
Revisions
-
March 15, 2020, by Milica Grahovac:
First implementation.