1. What is Pump Power Calculation?

Definition: This calculator determines the power required by a pump to move fluid at a specified flow rate against a given head.

Purpose: Essential for engineers and technicians to properly size pumps and ensure efficient system operation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P \) — Pump power (watts)
• \( \rho \) — Fluid density (kg/m³)
• \( g \) — Gravitational acceleration (9.81 m/s²)
• \( Q \) — Volumetric flow rate (m³/s)
• \( H \) — Total dynamic head (m)
• \( \eta \) — Pump efficiency (decimal, 0-1)

Explanation: The formula calculates the hydraulic power needed to move the fluid, then divides by pump efficiency to account for energy losses.

3. Importance of Pump Power Calculation

Details: Accurate power calculation ensures proper pump selection, prevents under/over-sizing, optimizes energy consumption, and reduces operational costs.

4. Using the Calculator

Tips:

• Water density is typically 1000 kg/m³
• Standard pump efficiency ranges from 0.5 to 0.9 (50-90%)
• For kW, divide result by 1000
• For HP, divide watts by 746

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between hydraulic power and pump power?
A: Hydraulic power is the theoretical power needed to move the fluid, while pump power includes efficiency losses.

Q2: How do I determine pump efficiency?
A: Check manufacturer specifications or use typical values (0.7-0.85 for centrifugal pumps, 0.5-0.7 for positive displacement).

Q3: What if my flow rate is in L/s instead of m³/s?
A: Convert L/s to m³/s by dividing by 1000 (1 L/s = 0.001 m³/s).

Q4: Does this account for system losses?
A: No, this calculates pump power only. System losses should be included in the head calculation.

Q5: How does viscosity affect the calculation?
A: Higher viscosity fluids may require more power and reduce pump efficiency.