1. What is Pump Power Calculation?

The pump power calculation determines the mechanical power required to move fluid through a system. It accounts for the fluid properties, flow rate, elevation or pressure head, and pump efficiency.

2. How Does the Calculator Work?

The calculator uses the pump power equation:

Where:

• \( P \) — Power (Watts)
• \( \rho \) — Fluid density (kg/m³, 1000 for water)
• \( g \) — Gravitational acceleration (9.81 m/s²)
• \( Q \) — Volumetric flow rate (m³/s)
• \( H \) — Total dynamic head (meters)
• \( \eta \) — Pump efficiency (0-1)

Explanation: The equation calculates the power needed to move a specific volume of fluid against gravity and system resistance, accounting for energy losses in the pump.

3. Importance of Pump Power Calculation

Details: Accurate power calculation is essential for selecting properly sized pumps, estimating energy costs, and designing efficient fluid systems.

4. Using the Calculator

Tips:

• For water, density is typically 1000 kg/m³
• Flow rate must be in m³/s (convert from L/s by dividing by 1000)
• Head includes both elevation and pressure head
• Pump efficiency typically ranges 0.7-0.9 for centrifugal pumps

5. Frequently Asked Questions (FAQ)

Q1: How do I convert flow rate from L/s to m³/s?
A: Divide the value in L/s by 1000 (1 m³/s = 1000 L/s).

Q2: What is total dynamic head?
A: It's the sum of static head (height difference) and friction head (pressure loss due to pipe friction).

Q3: What's a typical pump efficiency?
A: Centrifugal pumps typically have 70-90% efficiency, while positive displacement pumps can reach 90%+.

Q4: How does fluid viscosity affect power?
A: Higher viscosity fluids require more power and may reduce pump efficiency.

Q5: Should I add a safety factor?
A: Yes, it's common to add 10-20% to the calculated power for safety margin and future needs.