Objective/Method/Outcome
Objective: Determines if the hot water supply temperature is poor
Method: The actual temperature of the Hot Water Supply and the setpoint is found and checked if it greater than the dead band for more than the appropriate amount of time during operational hours.
Outcome: Triggers an Integrity KPI
Applicable System
HWS
Description
Determine the error severity of a hot water 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 water temperature and the water temperature setpoint deadband while the water temperature is outside of the deadband during scheduled hours.
Diagnosis
- Issue with control loop. Review and modify controller tuning parameters.
- Automatic setpoint control has been overridden. Revert setpoint back to automatic control.
- Input sensor(s) faulty or miscalibrated. Verify input sensor(s) operation.
Message
The hot water supply temperature has deviated from the setpoint for more than 15 degree*hours per week while the system is enabled. Review controller tuning parameters.
Rule Template
Insight Type: Integrity KPI
Trigger Type: Active High
Default Priority
Medium
Logic
Inputs
| Input | Units | Tags | Description |
|---|---|---|---|
| Hot Water Supply Temperature | °C/ °F | Hot Water Supply Temperature | The recorded hot water temperature. |
| Hot Water Supply Temperature Setpoint | °C/ °F | Hot Water Supply Setpoint | The setpoint for water temperature |
| Status | Hot Water System Enabled, Boiler Status | To detect if HWS is operational | |
| Const. – Temperature Threshold | °C/ °F | To minimum temperature deviation from setpoint beyond which an insight would be generated | |
| Const. – Acceptable Weekly Threshold | °*hr | ||
| Days of operation annually | Days per year the system is operational | ||
| Cost per Degree*Hour | $ |
Notes
CTL generated:
HWST Severity KPI
