1. Hydronic Pump Power Calculation

This calculator determines the required pump power for hydronic (water-based) air systems in buildings. Proper pump sizing is essential for efficient system operation and energy conservation.

2. How the Calculator Works

The calculator uses the hydraulic power formula:

Where:

• \( Q \) — Flow rate (m³/h)
• \( \rho \) — Fluid density (kg/m³, 1000 for water)
• \( g \) — Gravitational acceleration (9.81 m/s²)
• \( H \) — Total head (m)
• \( \eta \) — Pump efficiency (0-1)

Explanation: The formula calculates the power needed to move fluid against system resistance, accounting for pump efficiency.

3. Importance of Proper Pump Sizing

Details: Correct pump sizing ensures energy efficiency, prevents cavitation, and extends equipment life. Oversized pumps waste energy while undersized pumps can't meet system demands.

4. Using the Calculator

Tips:

• Flow rate: Typical values range from 5-50 m³/h for small to medium buildings
• Total head: Includes friction losses and static head (typically 10-30m)
• Efficiency: Modern pumps range from 0.7-0.85

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and dynamic head?
A: Static head is the vertical height difference, while dynamic head includes friction losses in pipes and fittings.

Q2: How do I determine system flow rate?
A: Calculate based on heat load (Q = heat load / (ΔT × 4.186 × density)) or use design specifications.

Q3: What if my fluid isn't water?
A: Adjust density value accordingly (e.g., glycol mixtures have higher density).

Q4: Should I add a safety factor?
A: Typically add 10-20% to calculated power for safety margin and future expansion.

Q5: How does variable speed affect pump selection?
A: Variable speed pumps can adjust to demand but still need proper base sizing.