Determine if zone heating is undersized

Applicable Systems

  • NIST: APAR13
  • Secondary: VAV, FCU, UV, UH, RAD, RHT

Objective/Method/Outcome

  • Objective: Determine if an air heating system is at full capacity but unable to meet set point. Based on NIST APAR 3.
  • Method: Check if the RT is more than 2 degrees below its set point when the HCV is at its maximum value during occupied hours.
  • Outcome: An insight is generated if the RT is more than 2 degrees below its set point while the HCV has been fully open for more than 8 hours per week.

Logic

If(SP - RT > Temperature Threshold && HCV > 98%  Open) { return true; }
Determine if zone heating is undersized

Inputs

  • RT {sensor, zone, air, temp} (Real Trend Log)
  • HCV {cmd, heat, water, valve } (Real Trend Log)
  • RT SP {sp, zone, air, temp} (Real Trend Log)
  • Occ {occupied} (Binary Trend Log)
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