Heat Exchanger, Coil & Radiator Manufacturing worked example

Thermal Performance Margin with available thermal duty of 310 kW: a worked example

This scenario runs the thermal performance margin calculation on the strong side: available thermal duty of 310 kW, with every other input held at its documented default. Use it when measured or predicted capacity must be checked against a required BTU/hr or kW duty before release, quote approval, or design review.

The inputs for this scenario

  • Available thermal duty: 310 kW (raised for this scenario; the documented default is 125)
  • Required thermal duty: 100 kW (unchanged)
  • Reference thermal duty: 100 kW (unchanged)

Working through the calculation

  • Applying the documented formula (Thermal duty margin = available thermal duty - required thermal duty) to the inputs above produces each figure below.
  • At this operating point the engine returns 210 % for thermal performance margin, the number this scenario is built around.
  • At this operating point the engine returns 210 value for thermal duty margin.
  • At this operating point the engine returns 310 value for available thermal duty.
  • At this operating point the engine returns 100 value for required thermal duty.

How this compares with the baseline

  • Against the tool's baseline example, where available thermal duty sits at 125 kW and the headline result is 25 %, this scenario comes in 740% above the baseline at 210 %.
  • Use it during design validation and incoming-test sign-off to confirm a coil clears its required duty with enough headroom for field derate. 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

  • Thermal performance margin: 210 % (headline result)
  • Thermal duty margin: 210 value
  • Available thermal duty: 310 value
  • Required thermal duty: 100 value

Run it with your numbers

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

Last reviewed 2026-05-12.