1. What Is The Flat Oval Equivalent Duct Equation?

The Flat Oval Equivalent Duct equation calculates the equivalent diameter (De) of a flat oval duct based on its cross-sectional area (A) and perimeter (P). This is useful in HVAC systems for determining the hydraulic diameter of non-circular ducts.

2. How Does The Calculator Work?

The calculator uses the equation:

Where:

• \( A \) — Cross-sectional area (units²)
• \( P \) — Perimeter (units)
• \( De \) — Equivalent diameter (units)

Explanation: This formula provides the diameter of a circular duct that would have the same hydraulic characteristics as the flat oval duct.

3. Importance Of Equivalent Diameter Calculation

Details: Calculating the equivalent diameter is essential for proper airflow analysis, pressure drop calculations, and system design in HVAC applications.

4. Using The Calculator

Tips: Enter the cross-sectional area in square units and perimeter in the same linear units. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What units should I use for area and perimeter?
A: Use consistent units for both measurements (e.g., both in inches or both in millimeters).

Q2: Why is equivalent diameter important in HVAC?
A: It allows engineers to compare the flow characteristics of non-circular ducts with standard circular ducts.

Q3: Can this formula be used for other duct shapes?
A: This specific formula is designed for flat oval ducts. Other shapes have different equivalent diameter formulas.

Q4: How accurate is this calculation?
A: The formula provides a good approximation for most engineering purposes in HVAC system design.

Q5: What's the practical application of this calculation?
A: It's used to determine proper duct sizing, calculate airflow resistance, and ensure efficient system performance.