1. What is an Air Pipe Sizing Calculator?

Definition: This calculator determines the optimal pipe diameter for air flow systems based on the air flow rate and desired velocity.

Purpose: It helps HVAC engineers, mechanical designers, and facility managers properly size air ducts and pipes for efficient airflow.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( D \) — Pipe diameter (meters)
• \( Q \) — Volumetric flow rate (m³/s)
• \( v \) — Air velocity (m/s)
• \( \pi \) — Pi constant (~3.1416)

Explanation: The formula calculates the minimum pipe diameter needed to maintain the desired air velocity for a given flow rate.

3. Importance of Proper Pipe Sizing

Details: Correct pipe sizing ensures efficient airflow, minimizes pressure drops, reduces energy consumption, and prevents excessive noise.

4. Using the Calculator

Tips: Enter the air flow rate in m³/s and desired velocity in m/s (default 10 m/s for general ventilation). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical air velocity for ventilation systems?
A: For general ventilation, 6-12 m/s is common. Higher velocities (10-20 m/s) may be used in industrial systems.

Q2: How does pipe diameter affect system performance?
A: Smaller diameters increase velocity and pressure drop, requiring more fan power. Larger diameters reduce velocity and noise but cost more.

Q3: When would I need a different velocity?
A: Lower velocities (2-5 m/s) for quiet spaces, higher velocities (15-20 m/s) for industrial exhaust systems.

Q4: How do I convert CFM to m³/s?
A: Multiply CFM by 0.00047194745 to get m³/s.

Q5: Does this account for pressure drop?
A: No, this calculates diameter based on velocity only. Additional calculations are needed for pressure drop analysis.