Preventive maintenance of MEP Equipment

HVAC Design: Constant Velocity Method

This video tutorial explains how to design an HVAC system using the constant velocity method.

Video Presentation

Constant Velocity Method

The constant velocity method is used in HVAC design to maintain a consistent air velocity throughout the ductwork system.

Constant Velocity: Ensures uniform air distribution.
Design Considerations: Requires knowledge of air velocity, duct size, and airflow rate.
Benefits: Simplifies duct design and improves system performance.

Example Calculation

To design an HVAC system using the constant velocity method, follow these steps:

Determine Airflow Rate: Calculate the total airflow required (CFM).
Select Air Velocity: Choose an appropriate air velocity (FPM).
Calculate Duct Size: Use the formula to determine the duct diameter or dimensions.

Formula for duct size calculation:

                Duct Area (sq ft) = Airflow Rate (CFM) / Air Velocity (FPM)
                Duct Diameter (in) = sqrt((Duct Area (sq ft) * 144) / π)

Example:

Airflow Rate: 1000 CFM
Air Velocity: 800 FPM
Duct Area: 1000 / 800 = 1.25 sq ft
Duct Diameter: sqrt((1.25 * 144) / π) ≈ 15.19 in

Applications

The constant velocity method is suitable for:

Residential HVAC systems.
Commercial HVAC systems.
Industrial ventilation systems.

Conclusion

The constant velocity method provides a straightforward approach to HVAC design, ensuring consistent air distribution and system efficiency.

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