1. What is the Fan Power Formula?

The Fan Power Formula calculates the power required by a fan to move air at a given flow rate against a specific pressure difference, taking into account the fan's efficiency. It's essential for HVAC system design and energy consumption analysis.

2. How Does the Calculator Work?

The calculator uses the fan power equation:

Where:

• \( P \) — Fan power (W)
• \( Q \) — Air flow rate (m³/s)
• \( \Delta P \) — Pressure difference (Pa)
• \( \eta \) — Fan efficiency (dimensionless, 0-1)

Explanation: The formula shows that power requirement increases with higher flow rates or pressure differences, and decreases with higher efficiency.

3. Importance of Fan Power Calculation

Details: Accurate fan power calculation is crucial for proper system design, energy efficiency assessment, and selecting appropriately sized motors.

4. Using the Calculator

Tips: Enter air flow rate in m³/s, pressure difference in Pascals, and efficiency as a decimal between 0 and 1 (e.g., 0.85 for 85% efficiency).

5. Frequently Asked Questions (FAQ)

Q1: What are typical fan efficiency values?
A: Typical values range from 0.5-0.9 (50-90%), with higher efficiency for larger, well-designed fans.

Q2: How does pressure difference affect power?
A: Power is directly proportional to pressure difference - doubling ΔP doubles the power requirement.

Q3: What units should I use?
A: The calculator uses SI units (m³/s, Pa, W). For other units, convert before entering values.

Q4: Does this include motor efficiency?
A: No, this calculates only fan power. For total system power, divide by motor efficiency.

Q5: How accurate is this calculation?
A: It provides theoretical power. Actual power may vary due to system effects and operating conditions.