Industrial Fans, Blowers & Air Movement Equipment worked example

Energy Cost at 110% included operating share: a worked example in industrial fans, blowers & air movement equipment

What does the result look like when included operating share reaches 110%? The full calculation is worked below with real intermediate numbers. Use it when comparing fan efficiency upgrades, VFD control, damper settings, pressure drop reduction, or test stand operating cost.

The inputs for this scenario

  • Fan operating hours: 2,000 hr (unchanged)
  • Energy cost per operating hour: 11.5 $ / hr (unchanged)
  • Included operating share: 110 % (raised for this scenario; the documented default is 100)
  • Fixed demand or test charge: 1,200 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Variable fan energy cost = fan operating hours × energy cost per operating hour × included operating share) to the inputs above produces each figure below.
  • At this operating point the engine returns 26,500 $ for total fan energy cost, the number this scenario is built around.
  • At this operating point the engine returns 13.25 $ / hr for energy cost per operating hour.
  • At this operating point the engine returns 25,300 $ for variable fan energy cost.
  • At this operating point the engine returns 1,200 $ for fixed demand or test charge.

How this compares with the baseline

  • Against the tool's baseline example, where included operating share sits at 100% and the headline result is 24,200 $, this scenario comes in 9.5% above the baseline at 26,500 $.
  • A figure at this level is achievable when included operating share is genuinely sustained, not just peaked for a shift. A flat energy cost per hour assumes a steady operating point; fans on VFDs or varying system curves draw very different power across the duty cycle, so a single rate can mislead.

Results at a glance

  • Total fan energy cost: 26,500 $ (headline result)
  • Energy cost per operating hour: 13.25 $ / hr
  • Variable fan energy cost: 25,300 $
  • Fixed demand or test charge: 1,200 $

Run it with your numbers

  • Every input above is editable in the live Energy Cost calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.