כיצד לחשב את Pump Power
learn.whatIsHeading
Pump power requirement is calculated from flow, head, and efficiency. Proper sizing prevents under-pumping and excessive energy waste.
נוסחה
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
מדריך שלב אחר שלב
- 1Calculate: P = (Q × H × ρ × g) / η
- 2Or: P = (GPM × Total Head) / (3960 × Efficiency)
- 3Account for motor losses beyond pump efficiency
Worked Examples
קלט
Q = 0.05 m³/s, H = 20 m, ρ = 1000 kg/m³, η = 0.75
תוצאה
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.
מוכן לחשב? נסה את מחשבון Pump Power החינמי
נסה זאת בעצמך →