Hydraulic, Pneumatic & Fluid Power Systems worked example

Oil Cooling Load at 65% cooler availability and uptime: a worked example

Suppose cooler availability and uptime falls to 65%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate oil cooling load for hydraulic, pneumatic & fluid power systems planning, quoting, troubleshooting, capacity review, or process improvement.

The inputs for this scenario

  • Heat rejected per pump cycle: 4 units / cycle (held at the documented default)
  • Pump cycles available per shift: 480 cycles (held at the documented default)
  • Cooler availability / uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • Heat-exchanger effectiveness (yield): 97 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross oil cooling load capacity = units per cycle × available cycles.
  • Good output capacity works out to 1,211 units at these inputs, and this is the headline figure for the scenario.
  • Gross capacity works out to 1,920 units at these inputs.
  • Uptime loss works out to 672 units at these inputs.
  • Yield loss works out to 37.44 units at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where cooler availability and uptime sits at 90% and the headline result is 1,676 units, this scenario comes in 27.78% below the baseline at 1,211 units.
  • It multiplies heat rejected per cycle by available cycles for gross capacity, then derates by cooler uptime and heat-exchanger effectiveness to give good usable cooling capacity. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Good output capacity: 1,211 units (headline result)
  • Gross capacity: 1,920 units
  • Uptime loss: 672 units
  • Yield loss: 37.44 units

Run it with your numbers

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

Last reviewed 2026-05-12.