Applicable Systems
- Secondary: VAV
Objective/Method/Outcome
- Objective: Determine how well a Variable Air Volume unit’s Pressure Control is performing.
- Method: The KPI is determined by the deviation of the differential pressure (DP) from its set point, based on the total percentage of time a unit is within an allowable threshold (15%). Calculate the performance metric based on the total time the DP is not within the desired set point during occupied hours.
- Outcome: A performance KPI CTL is generated on a weekly basis.
Logic
while(occ == 1) { if( |DP - DP_SP| > 15% DP_SP) { Award performance KPI score 0% } else { Award performance KPI score 100% } average performance KPI score daily average performance KPI score weekly }
Description / Method
The KPI is determined by the deviation of the differential pressure (DP) from its set point, based on the total percentage of time a unit is within an allowable threshold (15%). Calculate the performance metric based on the total time the DP is not within the desired set point during occupied hours.
Diagnosis / Recommended Action
- Confirm VAV damper is operational
- Check pitot tubes for blockage
- Check controller tuning
- Check scale range and functionality of DP sensor
Message
The VAV’s DP KPI score is below 60% for the date range selected.
Notes
The rule is disabled if the differential pressure is less than 50% of it’s set point. This is to prevent misleading scores.
Rule Template Type
- Insight Type: Integrity KPI
- Trigger Type: Active High
Default Priority
Low
Inputs
Inputs | Units | Default Value | Tags | Description |
---|---|---|---|---|
Differential Pressure | sensor, air, differential, pressure | Pressure system behaviour data | ||
Differential Pressure Set Point | sp, air, differential, pressure | Pressure system set points | ||
Occupied | occupied | Building occupancy |