Objective/Method/Outcome
Objective: Determines if the hot water valve is consistently 100% open during operational hours.
Method: Compares the hot water valve command to the error threshold to find the hours during which the value is open at 100%. This is compared to the hours of operation to determine if the valve is consistently at full capacity and find the avoidable cost of running the system at 100%.
Outcome: The rule triggers an insight and calculates potential savings.
Applicable System
CWS
Description
Monitor valve position TL and determine if the valve is constantly at 100%. Calculate the percentage of active hours that valve is at 100%.
This rule is part of the CopperTree Standard rule-set.
Diagnosis
- Valve could be manually overridden.
- Valve could be stuck open.
Message
The chilled water valve is consistently 100% open.
Rule Template
Insight Type: Fault Detection
Trigger Type: Active High
Logic
Inputs
| Input | Unit | Tags | Description |
|---|---|---|---|
| Enabled | Room Occupied, Discharge Air Fan Status, Discharge Air Fan Command | ||
| Acceptable Weekly Threshold | % | The maximum time the fan can be at 100% without triggering an insight | |
| Valve Error Threshold | % | The acceptable error in the value of hot water valve command | |
| Cost per hour | Hr | The cost of running the system | |
| Days of operation annually | The number of days the unit is operational to project annual potential savings | ||
| CHW Valve | Discharge Air Cooling Command | The hot water valve command value |
