1. What is Fan Power?

Fan power is the amount of energy required to move air through a system against resistance. It's a crucial parameter in HVAC system design and analysis.

2. How Does the Calculator Work?

The calculator uses the fan power equation:

Where:

• \( P \) — Fan power (W)
• \( Q \) — Flow rate (m³/s)
• \( \Delta P \) — Pressure rise (Pa)
• \( \eta \) — Efficiency (dimensionless, 0-1)

Explanation: The equation shows that power is directly proportional to flow rate and pressure rise, and inversely proportional to system efficiency.

3. Importance of Fan Power Calculation

Details: Accurate fan power calculation is essential for proper system design, energy efficiency assessment, and equipment selection in ventilation and air conditioning systems.

4. Using the Calculator

Tips: Enter flow rate in m³/s, pressure rise in Pascals, and efficiency as a decimal between 0 and 1 (e.g., 0.85 for 85% efficiency). All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What are typical efficiency values for fans?
A: Fan efficiencies typically range from 0.5 to 0.9 (50-90%), with higher values indicating more efficient systems.

Q2: How does pressure rise relate to system resistance?
A: Pressure rise is the amount of static pressure the fan must overcome to move air through the duct system.

Q3: What units should I use for this calculation?
A: The calculator uses SI units (m³/s, Pa, W). For other units, convert to these before calculation.

Q4: Why is efficiency important in fan power calculations?
A: Efficiency accounts for energy losses in the system, showing how much input power is actually used to move air.

Q5: Can this be used for pumps as well?
A: The same basic principle applies to pumps, though pump power calculations may use different efficiency factors.