1. What is Pump Motor Power?

Pump motor power refers to the amount of mechanical power required to drive a pump, accounting for the energy needed to move fluid against resistance (head), considering the pump's efficiency.

2. How Does the Calculator Work?

The calculator uses the pump power equation:

Where:

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

Explanation: The equation calculates the theoretical power required to move fluid, then divides by efficiency to account for real-world energy losses in the pump system.

3. Importance of Pump Power Calculation

Details: Accurate pump power calculation is essential for proper motor selection, energy consumption estimation, system design optimization, and preventing motor overload or underutilization.

4. Using the Calculator

Tips: Enter flow rate in m³/s, density in kg/m³, head in meters, and efficiency as a decimal between 0 and 1. All values must be positive numbers with efficiency not exceeding 1.

5. Frequently Asked Questions (FAQ)

Q1: What is typical pump efficiency range?
A: Pump efficiency typically ranges from 0.5 to 0.9 (50% to 90%), depending on pump type, size, and operating conditions.

Q2: How do I convert flow rate from L/min to m³/s?
A: Divide L/min by 60,000 (since 1 m³ = 1000 L and 1 min = 60 s).

Q3: What density should I use for water?
A: For water at 4°C, use 1000 kg/m³. For other temperatures, adjust accordingly (approx. 998 kg/m³ at 20°C).

Q4: Does this include motor efficiency?
A: No, this calculates pump shaft power. For electrical input power, divide by motor efficiency.

Q5: What is total head in pumping systems?
A: Total head includes static head (elevation difference), friction head (pipe losses), and pressure head (system pressure requirements).