1. What Is Impeller Efficiency?

Impeller efficiency (η) measures how effectively an impeller converts mechanical shaft power into hydraulic power. It represents the ratio of useful hydraulic output power to the mechanical input power supplied to the impeller shaft.

2. How Does The Calculator Work?

The calculator uses the impeller efficiency formula:

Where:

• \( \eta \) — Impeller efficiency (%)
• \( \text{hydraulic\_power} \) — Hydraulic power output (W)
• \( \text{shaft\_power} \) — Mechanical shaft power input (W)

Explanation: This formula calculates the percentage efficiency by comparing the useful hydraulic power generated to the mechanical power consumed.

3. Importance Of Efficiency Calculation

Details: Calculating impeller efficiency is crucial for optimizing pump performance, reducing energy consumption, identifying maintenance needs, and ensuring proper system design in fluid handling applications.

4. Using The Calculator

Tips: Enter both hydraulic power and shaft power in watts (W). Ensure values are positive and shaft power is greater than zero. The calculator will compute efficiency as a percentage.

5. Frequently Asked Questions (FAQ)

Q1: What is considered good impeller efficiency?
A: Typical impeller efficiencies range from 60% to 85%, with well-designed impellers achieving 75-85% efficiency depending on the application and design.

Q2: How is hydraulic power calculated?
A: Hydraulic power = Flow rate × Pressure difference × Fluid density × Gravity / Efficiency factor.

Q3: What factors affect impeller efficiency?
A: Blade design, surface roughness, clearance gaps, operating speed, fluid viscosity, and cavitation can all impact efficiency.

Q4: Can efficiency exceed 100%?
A: No, efficiency cannot exceed 100% as this would violate energy conservation laws. Values over 100% indicate measurement errors.

Q5: How can I improve impeller efficiency?
A: Optimize blade geometry, reduce surface roughness, maintain proper clearances, operate at design point, and minimize cavitation through proper NPSH.