1. What is Pump Power?

Pump power is the energy required to move a fluid through a system. It depends on the fluid properties, flow rate, head (height the fluid needs to be lifted), and pump efficiency.

2. How Does the Calculator Work?

The calculator uses the pump power formula:

Where:

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

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

3. Importance of Pump Power Calculation

Details: Accurate pump power calculation is essential for selecting the right pump motor, ensuring energy efficiency, and preventing overloading.

4. Using the Calculator

Tips:

• Water density is approximately 1000 kg/m³ at 4°C
• Typical pump efficiency ranges from 0.5 to 0.9
• For imperial units, convert to metric before calculation
• All values must be positive numbers

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between kW and horsepower?
A: 1 kW ≈ 1.34 hp. The calculator shows kW, but you can multiply by 1.34 to get horsepower.

Q2: How does viscosity affect pump power?
A: Higher viscosity fluids require more power, which is indirectly accounted for in the efficiency factor.

Q3: What is typical pump efficiency?
A: Centrifugal pumps typically range 50-90% efficiency, while positive displacement pumps can reach 90% or more.

Q4: How do I account for pipe friction losses?
A: Include these losses in your total head (H) calculation by adding them to the static head.

Q5: Can I use this for gases?
A: This formula is primarily for liquids. Gas calculations require additional factors for compressibility.