Objective/Method/Outcome
Objective: Determines if Boiler is cycling states using Analog and Binary trend log
Method: Normalizes the analog and binary samples and checks to see if they cycle more than the acceptable amount of time. For boilers cycling frequently, a weekly property impact is calculated. An Urgency score depending on the severity of cycling and the potential savings are calculated by subtracting the cost of excessive cycling and the cost of buying new equipment.
Outcome: Trigger an insight, assigns an urgency score, weekly proper impact, and calculates potential savings.
Description
Analyzes equipment state changes using Analog or Binary trend log, triggering an insight when daily cycles exceed a threshold.
This rule is part of the CopperTree Standard ruleset.
Default Priority
Medium
Diagnosis
Check and revise programming and sequence of operation to prevent unnecessary equipment cycling.
Message
Check and revise programming and sequence of operation to prevent unnecessary equipment cycling.
Rule Template
Insight Type: Fault Detection
Trigger Type: Active High
Logic
Inputs
| Input | Unit | Tags | Description |
|---|---|---|---|
| Equip Command or Amperage | Boiler Status, Boiler Command | The recorded status to determine if boiler is active | |
| Threshold – PropertyImpact Weekly | The minimum property impact that can trigger insight | ||
| Threshold – UrgencyScore WeeklyMax | The minimum urgency score per week that can trigger insight | ||
| Cost to Replace Equipment | $ | The cost of replacing faulty equipment | |
| Expected Equipment Lifetime | Years | ||
| Annual Days of Operation | The days per year the boiler is active | ||
| Threshold – Analog Cycle Delta | The minimum analog change that can trigger an insight | ||
| Threshold – Daily Cycles | The minimum daily cycling that can trigger an insight |
Notes
Urgency Score is a measure of how urgent the fault is, and a high score denotes critical adverse impact on the equipment. Urgency Score is scaled so that if the number of cycles is equal to or less than the Daily Cycles Threshold, the score is 0.
If the number of cycles per day is twice that of the Daily Cycles Threshold, the score is 100. The maximum score of the week is used to trigger the Insight. Property Impact is calculated as the number of days during the week where the cycle count was higher than threshold (expresses in percent of total days being monitored in the week)
Default values for constants:
- Threshold – Analog Cycle Delta: 1
- Threshold – PropertyImpact Weekly: 14
- Threshold – UrgencyScore WeeklyMax: 30
- Threshold – Daily Cycles: 20
