Enhanced Prioritization – Determine if boiler is operating when OAT is above lockout temperature
Applicable Systems
- Primary: BLR
Description / Method
Determines if the boiler is operating when the heating plant may not be required, and calculates Potential Savings and Energy Impact. {BLR}
Compare the rolling 4-hour average outdoor air temperature to the boiler lockout temperature.
Insight is triggered when Potential Savings exceeds the yearly threshold (defined by the user). This can be changed to trigger Energy Impact. Also generates PotentialSavings_DailyCUSUM ($) CTL.
- Potential Savings is the energy cost based on the time the boiler is enabled above the desired OAT threshold, a forecast in $/year. The rule estimates only 26 weeks of boiler operation for a year (defined by the user)
- Energy Impact is the number of daily hours boiler operating above threshold (expressed in percent of total daily hours boiler is on)
Logic
Diagnosis / Recommended Action
- 1. Boiler plant operating above OAT lockout. Verify heating plant sequence of operation.
- 2. Automatic control has been overridden. Revert equipment back to automatic control.
Message
The boiler has been operating while the OAT is above its lockout temperature. Ensure that boiler enable is not overridden, then verify sequence of operation.
Notes
Default values for constants: Energy Rate ($/kWh): 0.07 Threshold – PotentialSavings Yearly [$]: 100 Boiler Enable OAT Setpoint [deg]: 20 deg C / 68 deg F Voltage 3-Phase [V] {voltage}: 480 Power Factor [p.f] {pf}: 0.85 Estimated Weeks Of Boiler Operation: 26 Boiler Amperage Threshold for Running [A]: 0.5 Threshold-Weekly Energy Impact [%]: 14
Rule Template Type
- Insight Type: Fault Detection
- Trigger Type: Active High
Inputs
| Inputs | Units | Default Value | Tags | Description |
|---|---|---|---|---|
| Boiler Amps [Amps] {boiler, sensor, current} | Amps | boiler, sensor, current | Amperage TL from Boiler | |
| Outdoor Air Temp [deg] {sensor, outside, air, temp} | °C or °F | sensor, outside, air, temp | Outdoor Air Temperature TL | |
| Energy Rate [$/kWh] | Amps | 0.07 | Local utility rate | |
| Threshold – PotentialSavings Yearly [$] | Days | 100 | Threshold to trigger potential savings Insight | |
| Voltage 3-Phase [V] | Volts | 480 | 3-Phase Line-to-Line Voltage | |
| Power Factor [p.f] | 0.85 | Power Factor | ||
| Estimated Weeks Of Boiler Operation | Weeks | 26 | Estimated number of weeks Boiler will be running | |
| Boiler Amperage Threshold for Running [A] | Amps | 0.5 | Minimum amperage from boiler before it is considered to be running. | |
| Boiler Enable OAT Setpoint [deg] | °C or °F | 16 | Outdoor Air Temperature that the boiler should not run above | |
| Threshold-Weekly Energy Impact [%] | % | 14 | Threshold to trigger Energy Impact |
Output Calculated Trend Logs
| Output CTL | Units | Description |
|---|---|---|
| Boiler_EnergyImpact_Daily(%) | % | Daily Energy Impact of boiler operating above OAT threshold |
| Boiler_PotentialSavings_DailyCUSUM($) | $ | Cumulative sum of the daily potential savings |
| Trigger-PotentialSavings_Yearly | $ | Yearly potential savings |