Commercial office building

EFD has demonstrated that, even in a 4-star building with major efficiency programs underway, analytics are required to ensure buildings continue to perform optimally.

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Building demographics

  • A-Grade Commercial Office
  • 4.5 Star NABERS Energy
  • Redeveloped in 2003
  • 40,700 m2, 22 Levels
  • Siemens DESIGO BMS


  • Complex and energy intensive HVAC systems with limited equipment level transparency
  • Root causes of energy wasted difficult to detect and diagnose
  • No way of understanding or managing peak demand

Key insights

  • Opportunities identified to reduce peak demand
  • Equipment operating on public holidays (high rise)
  • AHU start and stop times not optimized
  • Inefficient chiller staging strategy (Smardt Chillers)
  • Multiple boilers operating at very low loads (staging issue)
  • Economy cycle dampers not being fully utilized
  • Economy cycle dampers operating in heating mode
  • Chiller short cycling (failed flow sensor detected)
  • Return air fan left in manual override for extended period
  • Cooling towers short-cycling during part load conditions


  • Envizi EFD was instrumental in achieving a 12% total energy reduction in 12 months, which increased the NABERS rating by 0.5 Stars. Additional cost savings are expected once peak demand reduction strategies are implemented.

Other success stories

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