Semiconductor Fab Equipment Manufacturing worked example

Bakeout Energy Cost at 81% heater duty cycle: a worked example

This scenario runs the bakeout energy cost calculation on the strong side: 81% heater duty cycle, with every other input held at its documented default. A fab equipment build engineer scheduling UHV bakeout uses it to forecast the energy spend on heaters and pumps for a chamber cycle.

The inputs for this scenario

  • Bakeout duration: 48 hours (unchanged)
  • Energy cost per hour: 14.5 $/hr (unchanged)
  • Heater duty cycle: 81 % (raised for this scenario; the documented default is 70)
  • Chamber prep & cooldown: 220 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Total bakeout energy = bakeout hours x energy cost per hour x duty cycle% + prep & cooldown) to the inputs above produces each figure below.
  • At this operating point the engine returns 784 $ for total bakeout energy cost, the number this scenario is built around.
  • At this operating point the engine returns 16.33 $ / piece for bakeout energy cost per unit.
  • At this operating point the engine returns 564 $ for variable bakeout energy cost.
  • At this operating point the engine returns 220 $ for fixed bakeout energy cost adder.

How this compares with the baseline

  • Against the tool's baseline example, where heater duty cycle sits at 70% and the headline result is 707 $, this scenario comes in 10.83% above the baseline at 784 $.
  • Use it when quoting a chamber recertification, budgeting a tool requalification, or deciding whether a longer bake at lower power beats a short high-power one. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Total bakeout energy cost: 784 $ (headline result)
  • Bakeout energy cost per unit: 16.33 $ / piece
  • Variable bakeout energy cost: 564 $
  • Fixed bakeout energy cost adder: 220 $

Run it with your numbers

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

Last reviewed 2026-05-12.