1. What is Pump Efficiency?

Pump efficiency (η) is a measure of how effectively a pump converts input power into useful hydraulic work. It's the ratio of hydraulic power delivered to the fluid to the mechanical power input to the pump.

2. How Does the Calculator Work?

The calculator uses the pump efficiency equation:

Where:

• \( \rho \) — Fluid density (kg/m³)
• \( g \) — Gravitational acceleration (9.81 m/s²)
• \( Q \) — Volumetric flow rate (m³/s)
• \( H \) — Total dynamic head (m)
• \( P \) — Input power (W)

Explanation: The numerator represents the hydraulic power delivered to the fluid, while the denominator is the mechanical power input to the pump.

3. Importance of Pump Efficiency

Details: Pump efficiency is crucial for energy conservation, operational cost reduction, and environmental impact. Higher efficiency means less energy wasted as heat and vibration.

4. Using the Calculator

Tips: Enter all values in the specified units. Density should be in kg/m³ (water ≈ 1000 kg/m³), flow rate in m³/s, head in meters, and power in watts.

5. Frequently Asked Questions (FAQ)

Q1: What is a good pump efficiency value?
A: Centrifugal pumps typically range from 40-85% efficiency. Positive displacement pumps can reach 90% or higher.

Q2: Why is my pump efficiency low?
A: Low efficiency can result from wear, improper sizing, cavitation, or operating away from the best efficiency point (BEP).

Q3: How can I improve pump efficiency?
A: Proper sizing, regular maintenance, impeller trimming, variable speed drives, and reducing system resistance can help.

Q4: Does fluid viscosity affect efficiency?
A: Yes, higher viscosity generally reduces efficiency due to increased friction losses.

Q5: Is 100% efficiency possible?
A: No, all pumps have mechanical and hydraulic losses that prevent 100% efficiency.