1. What is Pump Power?

Pump power is the energy required by a pump to move a fluid at a specified flow rate against a specific head. It's a crucial parameter in pump selection and system design.

2. How Does the Calculator Work?

The calculator uses the pump power equation:

Where:

• \( P \) — Pump power (kW)
• \( \rho \) — Fluid density (kg/m³)
• \( g \) — Gravitational acceleration (9.81 m/s²)
• \( Q \) — Flow rate (m³/s)
• \( H \) — Head (m)
• \( \eta \) — Pump efficiency (decimal, 0-1)

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

3. Importance of Pump Power Calculation

Details: Accurate pump power calculation ensures proper pump selection, prevents motor overload, and helps in energy consumption estimation.

4. Using the Calculator

Tips: Enter all values in the specified units. Typical water density is 1000 kg/m³. Pump efficiency typically ranges from 0.5 to 0.9 (50-90%).

5. Frequently Asked Questions (FAQ)

Q1: What is typical pump efficiency?
A: Centrifugal pumps typically have 50-85% efficiency, while positive displacement pumps can reach 90%.

Q2: How does viscosity affect pump power?
A: Higher viscosity fluids require more power due to increased friction losses.

Q3: What is the difference between brake power and water power?
A: Water power is the theoretical power needed to move the fluid, while brake power includes pump inefficiencies.

Q4: How do I account for system losses?
A: System losses should be added to the calculated head before power calculation.

Q5: Can this be used for all pump types?
A: This equation works for centrifugal and positive displacement pumps, though specific calculations may vary.