Objective/Method/Outcome
Objective: Determines if the fume hood airflow is exceeding setpoint for more than the acceptable amount of time.
Method: Compares the Exhaust Airflow to the setpoint to determine if the Airflow is above the Airflow threshold during occupied hours.
Outcome: Creates a Fault Detection insight and a CTL for Weekly hours above setpoint.
Applicable System
Fume Hood
Description
Fume hood airflow is exceeding setpoint, which may result in excess energy consumption.
This rule is part of the CopperTree Standard rule-set.
Diagnosis
- Check fumehood control and programming logic.
- Review airflow sensor calibration.
Message
Fume hood airflow is exceeding setpoint, which may result in excess energy consumption.
Rule Template
Insight Type: Fault Detection
Trigger Type: Active High
Default Priority
High
Logic
Inputs
| Input | Units | Tags | Description |
|---|---|---|---|
| Fume Hood Exhaust Airflow | Exhaust Air CFM | The recorded Exhaust Air Flow | |
| Insight Threshold – Allowable Hours | Hr | The minimum number of hours required to generate an insight | |
| Fume Hood Exhaust Airflow Setpoint | Exhaust Air CFM Setpoint | The setpoint for exhaust Airflow | |
| Fume Hood Status | Fume Hood Occupancy | The recorded status of fume hood | |
| Airflow Threshold | % | The minimum deviation from setpoint that triggers insight |
Notes
Default Thresholds:
- Airflow Setpoint Threshold: 10%
- Threshold – Weekly Acceptable Hours: 8
