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HVAC Duct Design: Static Regain Method

HVAC Duct Design: Static Regain Method

This video tutorial explains how to design HVAC ducts using the static regain method.

Video Presentation

Static Regain Method

The static regain method is a duct design technique that aims to balance the static pressure throughout the duct system.

  • Static Regain: Ensures that the velocity pressure is converted to static pressure, maintaining balanced airflow.
  • Design Considerations: Requires calculation of pressure drops and adjustments to duct sizes.
  • Benefits: Provides efficient and balanced air distribution.

Example Calculation

To design an HVAC duct system using the static regain method, follow these steps:

  1. Determine Airflow Rate: Calculate the total airflow required (CFM).
  2. Initial Duct Size: Select an initial duct size and calculate its velocity.
  3. Calculate Velocity Pressure: Use the formula to determine the velocity pressure (VP).
  4. Calculate Static Regain: Adjust the duct size to achieve a balance in static pressure.

Formula for velocity pressure calculation:

                VP = (Velocity^2) / (2 * g * Density)

Example:

  • Airflow Rate: 1000 CFM
  • Initial Duct Size: 12 inches diameter
  • Velocity: 1000 CFM / (π * (12/2)^2) = 1061 FPM
  • Velocity Pressure: (1061^2) / (2 * 32.2 * 0.075) ≈ 0.57 in. w.g.
  • Adjust Duct Size to balance static pressure

Applications

The static regain method is suitable for:

  • Commercial HVAC systems.
  • Industrial ventilation systems.
  • Complex ductwork designs requiring balanced airflow.

Conclusion

The static regain method provides a reliable approach to HVAC duct design, ensuring efficient and balanced air distribution throughout the system.

© 2024 HVAC Design Resources

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