The engineering question
Series circuits accumulate coolant temperature rise. Parallel paths can reduce individual rise but do not automatically balance: flow follows the lower-resistance path. Compare circuit flow, Reynolds number, pressure and ΔT; use manifold regulators where appropriate. Small bubblers, baffles, restrictions, hose condition and zone heat load can make intentional differences valid. The balance tool identifies potential imbalance only and requires measurement review.
Use the record, not a universal rule
Keep coolant condition, instrument basis, mold geometry and production state with each result. A calculator narrows the next check; it does not replace flow measurement, a pump curve, mold trial or supplier documentation.
Related tools
Reynolds Number · Required Flow · Circuit Balance · Cooling & Thermal Control hub
Sources
SmartFlow practical mold cooling · SmartFlow flow regulators.