Pump Efficiency Equation:
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Pump efficiency (η) is the ratio of hydraulic power delivered to the fluid to the mechanical power input at the pump shaft. For centrifugal pumps, typical efficiency ranges from 0.7 to 0.9 (70-90%).
The calculator uses the pump efficiency equation:
Where:
Explanation: The equation calculates how effectively the pump converts mechanical energy into hydraulic energy.
Details: Pump efficiency is crucial for energy conservation, operating cost reduction, and proper pump selection. Higher efficiency means less energy wasted as heat and vibration.
Tips: Enter all values in the specified units. Ensure density is in kg/m³, flow rate in m³/s, head in meters, and shaft power in watts for accurate results.
Q1: What is a good efficiency for centrifugal pumps?
A: Typical values range from 0.7 to 0.9 (70-90%). Larger pumps generally have higher efficiencies than smaller ones.
Q2: How can I improve pump efficiency?
A: Proper pump sizing, regular maintenance, impeller trimming for reduced flow needs, and minimizing system losses can improve efficiency.
Q3: Why does efficiency matter?
A: Pump operation accounts for significant energy costs in many industries. A 10% efficiency improvement can lead to substantial energy savings.
Q4: Does fluid viscosity affect efficiency?
A: Yes, higher viscosity generally reduces pump efficiency and may require special pump designs.
Q5: What's the difference between overall and hydraulic efficiency?
A: Hydraulic efficiency considers only fluid-related losses, while overall efficiency includes mechanical losses in bearings, seals, etc.