Heat Exchanger, Coil & Radiator Manufacturing worked example

Brazing Furnace Load at 65% furnace availability and uptime: a worked example

This worked example runs the brazing furnace load numbers for a tougher week than the baseline: 65% furnace availability and uptime instead of the typical 90%. Estimate good brazed core output per shift from fixture load, furnace cycles, uptime, and post-braze yield.

The inputs for this scenario

  • Cores loaded per furnace cycle: 4 cores / cycle (held at the documented default)
  • Usable furnace cycles per shift: 24 cycles / shift (held at the documented default)
  • Furnace availability/uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • Post-braze first-pass yield: 97 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross brazed core capacity = cores loaded per cycle × usable furnace cycles.
  • Good brazed core output works out to 60.53 cores / shift at these inputs, and this is the headline figure for the scenario.
  • Gross furnace output works out to 96 cores / shift at these inputs.
  • Furnace downtime loss works out to 33.6 cores / shift at these inputs.
  • Post-braze reject loss works out to 1.87 cores / shift at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where furnace availability and uptime sits at 90% and the headline result is 83.81 cores / shift, this scenario comes in 27.78% below the baseline at 60.53 cores / shift.
  • Use it for shift capacity planning, scheduling a braze line, or quantifying how downtime or braze rejects cut into shippable output. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Good brazed core output: 60.53 cores / shift (headline result)
  • Gross furnace output: 96 cores / shift
  • Furnace downtime loss: 33.6 cores / shift
  • Post-braze reject loss: 1.87 cores / shift

Run it with your numbers

  • To rerun this with your own numbers, open the live Brazing Furnace Load calculator, set furnace availability and uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.