1. What is Pump Flow Rate Calculation?

Definition: This calculator determines the volumetric flow rate of a pump based on its power input, efficiency, fluid density, and head.

Purpose: It helps engineers and technicians size pumps and understand their performance characteristics in fluid systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula relates the mechanical power input to the hydraulic power output, accounting for pump efficiency.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate estimation ensures proper system design, energy efficiency, and meets process requirements in applications like water supply, HVAC, and industrial processes.

4. Using the Calculator

Tips: Enter the pump power in watts, efficiency (default 0.8), fluid density (default 1000 kg/m³ for water), and head in meters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is typical pump efficiency?
A: Centrifugal pumps typically have 60-85% efficiency, while positive displacement pumps can reach 90%.

Q2: How do I convert m³/s to more common units?
A: Multiply by 1000 for L/s, or by 3600 for m³/h.

Q3: What affects pump efficiency?
A: Pump design, size, operating point, wear, and fluid viscosity all impact efficiency.

Q4: How is head different from pressure?
A: Head is pressure expressed in height of fluid column (meters), independent of fluid density.

Q5: Why is density important?
A: Denser fluids require more energy to pump at the same flow rate and head.