Objective/Method/Outcome
Objective: Determines if the temperature control of supply air temperature control is poor.
Method: Compares the recorded temperature of the supply air temperature and the setpoint and checks if it is greater than the dead band for more than the appropriate amount of time during operational hours.
Outcome: Triggers an Integrity KPI insight.
Description
Determine the error severity of a supply air temperature control system in degree*hours.
This rule is part of the CopperTree Standard rule-set.
Calculate the severity metric based on the absolute difference between the supply air temperature (SAT) and the SAT setpoint deadband during scheduled hours.
Default Priority
Low
Diagnosis
- Issue with control loop. Review and modify controller tuning parameters.
- Automatic setpoint control has been overridden. Revert setpoint back to automatic control.
- Chilled water not available. Verify chiller plant operation.
- Heating water not available. Verify boiler plant operation.
- Input sensor(s) faulty or miscalibrated. Verify input sensor(s) operation.
- Primary air not available. Verify Air Handling Unit operation.
Message
Supply air temperature has deviated from setpoint at a higher severity than specified.
Rule Template
Insight Type: Integrity KPI
Trigger Type: Active High
Inputs
| Input | Unit | Tags | Description |
|---|---|---|---|
| Supply Air Temperature | ° | Discharge Air Temperature | The recorded DAT |
| Supply Air Temperature Setpoint | ° | Discharge Air Temperature Setpoint | The preset DAT setpoint |
| Status | Discharge Air Fan Status, Discharge Air Fan Command | The recorded status of DAF | |
| Const. – Temperature Threshold | ° | The minimum temperature that can trigger an insight | |
| Const. – Acceptable Weekly Threshold | °*hr | The acceptable weekly hours of fault | |
| Cost per Degree*Hour | $ | The cost of fault per degree, per hour | |
| Days of operation annually | The yearly days of operation used to project potential savings |
Logic
Notes
Default Thresholds:
- Temperature Deadband: 1.5°
- Acceptable Weekly Degree*Hours: 40
