Applicable Systems
- Primary: AHU, RTU, MUA, ERV
- Secondary: HP, FCU, UV, UH
Description / Method
Measures runtime outside occupancy to determine Potential Savings and Energy Impact. Insight is triggered when Potential Savings exceeds the predicted yearly threshold. This can be changed to trigger Energy Impact.
- Potential Cost Savings is the energy cost based on time equipment runs unnecessarily, a forecast in $/year.
- Energy Impact is the number of days (expressed in percent of total days analyzed) that the energy consumption has exceeded the baseline.
- A CTL measures the cumulative sum (CUSUM) of the difference between actual energy cost and baseline energy cost – as determined by occupancy schedule.
- A second CTL measures the cumulative sum (CUSUM) of the number of days the energy consumption has exceeded baseline.
- A third CTL measures the cumulative sum (CUSUM) of the number of hours the equipment has run to date.
Logic
Diagnosis / Recommended Action
- 1. Schedule or control outputs in manual override, at the BAS front-end or control device.
- 2. Control program error. Verify equipment scheduling and sequence of operations.
Message
Equipment runtime issue. Please verify equipment scheduling and sequence of operations. The equipment has been running above the scheduled hours.
Notes
Default Values for Constants
- Threshold – Potential Savings Yearly [$]:100
- Threshold – Amperage Status [A]: 2
- Threshold – Energy Impact Weekly [%]: 14
- Voltage 3-phase [V] {sensor, voltage}: 480
- Power Factor [p.f]: 0.85
- Energy Rate [$/kWh]: 0.07
Rule Template Type
- Insight Type: Fault Detection
- Trigger Type: Active High
Inputs
| Inputs | Units | Default Value | Tags | Description |
|---|---|---|---|---|
| Equipment Amps [A] {sensor, current} | Amps | sensor, current | Amperage of the equipment you want to monitor | |
| Equipment Schedule {occupied} | occupied | Schedule that the equipment should be running within | ||
| Threshold – Potential Savings Yearly [$] | $ | 100 | Threshold to trigger potential savings Insight | |
| Threshold – Amperage Status [A] | Amps | 2 | Minimum current level that will be considered to be on | |
| Threshold – Energy Impact Weekly [%] | % | 14 | Weekly Energy Impact | |
| Voltage 3-phase [V] {sensor, voltage} | Voltage | 480 | sensor, voltage | 3-Phase Line-to-Line Voltage |
| Power Factor [p.f] | 0.85 | Power Factor of equipment | ||
| Energy Rate [$/kWh] | $/kWh | 0.07 | Local utility rate |
Output Calculated Trend Logs
| Output CTL | Units | Description |
|---|---|---|
| EquipmentRuntime_HoursCUSUM | Hours | Cumulative sum of equipment runtime in hours |
| PotentialSavingsCUSUM[$] | $ | Cumulative sum of potential cost savings |
| PotentialSavings_Yearly[$] | $ | Potential Savings if runtime issues are resolved |
| DaysAboveBaselineCountCUSUM | Days | Cumulative Sum of days equipment is running above the baseline count |
| EnergyImpact | % | Energy Impact of Equipment running out of schedule |
