1. What is Pump Motor Power Calculation?

The pump motor power calculation determines the required power for a pump to move a specific flow rate of water against a given head, considering the pump's efficiency. It's essential for proper pump selection and system design.

2. How Does the Calculator Work?

The calculator uses the pump power formula:

Where:

• \( P \) — Pump power (kW)
• \( Flow \) — Flow rate (m³/h)
• \( Head \) — Total dynamic head (m)
• \( Efficiency \) — Pump efficiency (decimal, 0-1)
• 9.81 — Acceleration due to gravity (m/s²)
• 1000 — Water density (kg/m³)
• 3600 — Conversion factor from seconds to hours

Explanation: The equation calculates the power required to move water against gravity and system resistance, accounting for pump efficiency.

3. Importance of Pump Power Calculation

Details: Accurate power calculation ensures proper pump sizing, prevents underpowered or overpowered systems, and helps in energy efficiency optimization.

4. Using the Calculator

Tips: Enter flow rate in m³/h, head in meters, and efficiency as a decimal between 0 and 1. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is typical pump efficiency?
A: Centrifugal pumps typically range from 40-85% efficiency (0.4-0.85), depending on size and design.

Q2: Why is head measured in meters?
A: Head represents the height water would be lifted, accounting for both static lift and friction losses in the system.

Q3: Can this be used for other liquids?
A: This calculator is specifically for water. For other liquids, multiply by the specific gravity (density relative to water).

Q4: How does flow rate affect power?
A: Power is directly proportional to flow rate - doubling the flow requires double the power (at constant head and efficiency).

Q5: What safety factor should be added?
A: Typically 10-20% extra power is added to account for system variations and future demands.