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Kako izračunati Pump Power

Što je Pump Power?

Pump power requirement is calculated from flow, head, and efficiency. Proper sizing prevents under-pumping and excessive energy waste.

Formula

Calculate: P = (Q × H × ρ × g) / η
P
(GPM × Total Head) / (3960 × Efficiency) — (GPM × Total Head) / (3960 × Efficiency)
Q
Q value — Variable used in the calculation
H
H value — Variable used in the calculation

Vodič korak po korak

  1. 1Calculate: P = (Q × H × ρ × g) / η
  2. 2Or: P = (GPM × Total Head) / (3960 × Efficiency)
  3. 3Account for motor losses beyond pump efficiency

Worked Examples

Unos
Q = 0.05 m³/s, H = 20 m, ρ = 1000 kg/m³, η = 0.75
Rezultat
P ≈ 13 kW required
Select larger motor for margin

Common Mistakes to Avoid

  • Under-estimating system friction loss
  • Over-sizing pump (operates inefficiently at partial load)

Frequently Asked Questions

Why does head matter more than volume?

Quadratic relationship with head; doubling head doubles power. Efficiency varies with duty point.

How do you select pump size?

Choose pump with duty point (Q, H) near best efficiency point for long equipment life.

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