Hydraulic, Pneumatic & Fluid Power Systems worked example

Oil Cooling Load at 99% cooler availability and uptime: a worked example

This scenario runs the oil cooling load calculation on the strong side: 99% cooler availability and uptime, with every other input held at its documented default. Use it when oil cooling load in hydraulic, pneumatic and fluid power systems is being asked to take on more work and you need to know if there is room.

The inputs for this scenario

  • Heat rejected per pump cycle: 4 units / cycle (unchanged)
  • Pump cycles available per shift: 480 cycles (unchanged)
  • Cooler availability / uptime: 99 % (raised for this scenario; the documented default is 90)
  • Heat-exchanger effectiveness (yield): 97 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross oil cooling load capacity = units per cycle × available cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,844 units for good output capacity, the number this scenario is built around.
  • At this operating point the engine returns 1,920 units for gross capacity.
  • At this operating point the engine returns 19.2 units for uptime loss.
  • At this operating point the engine returns 57.02 units for yield loss.

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 10% above the baseline at 1,844 units.
  • Use it when sizing or auditing a hydraulic oil cooler against the heat the duty cycle actually generates. 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

  • Good output capacity: 1,844 units (headline result)
  • Gross capacity: 1,920 units
  • Uptime loss: 19.2 units
  • Yield loss: 57.02 units

Run it with your numbers

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

Last reviewed 2026-05-12.