1. What is Pump Motor Power?

Pump motor power is the energy required to move a fluid at a specified flow rate against a specific head (pressure). It depends on the fluid properties (density), flow rate, system head, and pump efficiency.

2. How Does the Calculator Work?

The calculator uses the pump power formula:

Where:

• \( P \) — Power (kW)
• \( Q \) — Flow rate (m³/h)
• \( H \) — Head (m)
• \( \rho \) — Density (kg/m³)
• \( g \) — Gravity (9.81 m/s²)
• \( \eta \) — Pump efficiency (0-1)

Explanation: The formula calculates the theoretical power required to move the fluid, then divides by pump efficiency to get actual motor power requirement.

3. Importance of Pump Power Calculation

Details: Accurate power calculation ensures proper motor sizing, prevents underpowering (which can cause failure) or overpowering (which wastes energy and money).

4. Using the Calculator

Tips: Enter flow rate in m³/h, head in meters, density in kg/m³ (1000 for water), and efficiency as decimal (0.8 for 80%). All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical pump efficiency value?
A: Centrifugal pumps typically range 60-85%, while positive displacement pumps can reach 90%. Always check manufacturer specifications.

Q2: How does viscosity affect pump power?
A: Higher viscosity fluids require more power. For viscous fluids, specialized calculations may be needed.

Q3: Should I add a safety factor?
A: Yes, typically 10-20% extra power is added to account for system losses and future demands.

Q4: What if my flow is in L/s instead of m³/h?
A: Convert L/s to m³/h by multiplying by 3.6 (1 L/s = 3.6 m³/h).

Q5: How does density affect power requirements?
A: Power is directly proportional to density. Denser fluids require more power to pump.