Pump Selection & System Efficiency Calculation Excel Template

This Excel template operationalizes fundamental principles of fluid mechanics and thermodynamics to streamline pump selection and system optimization. At its core, it combines the pump performance curve (head vs. flow rate) with the system resistance curve (derived from pipe friction, elevation changes, and fittings) to identify the operating point—the intersection where pump output matches system demand. The template typically incorporates iterative calculations for affinity laws (to model speed or impeller diameter changes), NPSH margin verification (to prevent cavitation), and efficiency mapping across partial-load conditions. It also accounts for motor efficiency, drive losses (e.g., VFDs), and utility tariffs to estimate annual energy consumption and lifecycle costs—enabling holistic evaluation beyond peak-efficiency points. Advanced versions include sensitivity analysis, Monte Carlo-based uncertainty propagation, and integration with manufacturer datasheets via embedded lookup tables or Power Query connections.