1. What is the Pump Power Equation?

The pump power equation calculates the theoretical power required to move a fluid at a specified flow rate against a given head, taking into account the fluid's density and the pump's efficiency.

2. How Does the Calculator Work?

The calculator uses the pump power equation:

Where:

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

Explanation: The equation calculates the energy needed to move a volume of fluid against gravity and system resistance, adjusted for pump efficiency.

3. Importance of Pump Power Calculation

Details: Accurate power calculation is essential for proper pump selection, energy efficiency assessment, and electrical system design.

4. Using the Calculator

Tips: Enter fluid density (1000 kg/m³ for water), flow rate, head, and pump efficiency (typically 0.7-0.9 for centrifugal pumps). All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between theoretical and actual power?
A: Theoretical power is the ideal requirement. Actual power includes additional factors like mechanical losses and safety margins.

Q2: How does head relate to pressure?
A: Head (in meters) can be converted to pressure (in kPa) by multiplying by fluid density and gravity (P = ρgh).

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

Q4: Can I use this for fluids other than water?
A: Yes, just input the correct density for your fluid (e.g., 800 kg/m³ for diesel, 13600 kg/m³ for mercury).

Q5: How do I account for system losses?
A: System losses should be added to the static head or accounted for by using a lower efficiency value.