Determine zone temperature performance KPI score

Applicable Systems

• Primary: VAV, HP, FCU, UV, UH, RAD, RHT

Objective/Method/Outcome

• Objective: Determine zone temperature performance score.

• Method: Determine the performance index of a zone temperature control system using the amount of time the room temperature is within the deadband (set-point ± 1.5) during occupied hours.

• Outcome: A KPI score is generated on a daily basis, while a ‘Bad Score’ insight can be produced if the weekly score is less than a threshold (default 60%) if the user changes the trigger block to “Insight – Bad Score”.

Logic

• Input normalized room temperature and the corresponding room temperature set point.
• With a threshold constant, check if the temperature deviation is out of the deadband.
• If the threshold is exceeded and the zone is occupied, award a score of 0% for the 5-minute interval examined. If within deadband, award a score of 100% for the 5-minute interval examined.
• Average the score daily & weekly.
• If the trigger block is changed to “Insight – Bad Score” and the weekly score is less than the acceptable weekly score, generate an insight.

while(Occ == 1)
   {
   if( |RT - RT_SP| > Deadband Const.)
         {
         Award performance KPI score 0%
         }
   else
         {
         Award perfromance KPI score 100%\
         }
   average performance KPI score daily
   average performance KPI score weekly
   }

Description / Method

Determine the performance index of a zone temperature control system using the amount of time the room temperature is within the deadband (set-point ± 1.5) during occupied hours. {VAV | HP | FCU | UV | UH | RAD | RHT | CHILLEDBEAMZONE}

Diagnosis / Recommended Action

1. Issue with control loop. Review and modify controller tuning parameters.
2. Automatic setpoint control may have been overridden. Review zone temperature setpoint control.
3. Input sensor(s) faulty or miscalibrated. Verify input sensor(s) operation.
4. Primary air not available. Verify Air Handling Unit operation.
5. Chilled water not available. Verify chiller plant operation.
6. Heating water not available. Verify boiler plant operation.

Message

The room temperature KPI score is below 60% for the week. Review control loop tuning parameters.

Notes

This rule will not generate an insight unless the user changes the Trigger Block to “Insight – Bad Score”.

This rule is designed for °C inputs by default.Default Constants:

• Const. – Acceptable Weekly Score [%]: 60
• Const. – Room Temperature Deadband [°C]: 1.5
  • (Recommended default deadband for Fahrenheit is 3 °F)

CTL Generated:

• RT Performance KPI

Rule Template Type

• Insight Type: Integrity KPI
• Trigger Type: Active High

Default Priority

Low

Inputs

Inputs	Units	Default Value	Tags	Description
Room Temperature	°C		sensor, zone, air, temp	Room temperature records
Room Temperature Setpoint	°C		sp, zone, air, temp	Room temperature set point
Occupancy			occupied	Building occupancy
Const. – Room Temperature Deadband	°C	1.5		The acceptable temperature variance from setpoint
Const. – Acceptable Weekly Score	%	60		The lowest acceptable weekly score

Output Calculated Trend Logs

Output CTL	Units	Description
RT Performance KPI	%	Score representing the amount of time the room temperature is within deadband, as a percentage