Injection Molding worked example
Cooling Water Flow with heat load to remove from mold of 30 kW: a worked example
This scenario runs the cooling water flow calculation on the strong side: heat load to remove from mold of 30 kW, with every other input held at its documented default. Use this when specifying mold cooling circuits, sizing chillers, or troubleshooting uneven cooling or hot spots in the mold.
The inputs for this scenario
- Heat load to remove from mold: 30 kW (raised for this scenario; the documented default is 12)
- Allowable water temperature rise: 3 °C (unchanged)
- Safety factor for fouling/restrictions: 1.2 x (unchanged)
Working through the calculation
- Applying the documented formula (Base flow = Heat load / (Water specific heat x Temperature rise)) to the inputs above produces each figure below.
- At this operating point the engine returns 108 L/min for result, the number this scenario is built around.
- At this operating point the engine returns 108 value for minimum flow (without safety factor).
- At this operating point the engine returns 1 x for multiplier.
- At this operating point the engine returns 90 value for factor a x b.
How this compares with the baseline
- Against the tool's baseline example, where heat load to remove from mold sits at 12 kW and the headline result is 43.2 L/min, this scenario comes in 150% above the baseline at 108 L/min.
- Use it when specifying a chiller or pump, sizing cooling circuits, or checking whether an existing system can keep a mold at temperature. 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
- Result: 108 L/min (headline result)
- Minimum flow (without safety factor): 108 value
- Multiplier: 1 x
- Factor A x B: 90 value
Run it with your numbers
- Every input above is editable in the live Cooling Water Flow calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.