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
- 1Calculate: P = (Q × H × ρ × g) / η
- 2Or: P = (GPM × Total Head) / (3960 × Efficiency)
- 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.
Spremni za izračun? Isprobajte besplatni Pump Power kalkulator
Probajte sami →