Pressure Drop In Circular Duct Calculator

Formula Used:

\[ \Delta P_c = \frac{0.6 \times f \times L \times V_m^2}{d/4} \]

Friction Factor in Duct (f):

Length of Duct (L):

Mean Velocity of Air (V_m):

m/s

Diameter of Circular Duct (d):

Pressure Drop in Circular Duct (ΔP_c):

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1. What is Pressure Drop in Circular Duct?

Pressure Drop in Circular Duct due to friction is the decrease in the value of the pressure due to the influence of friction in a circular duct system. It's an important parameter in HVAC and fluid dynamics calculations.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \Delta P_c = \frac{0.6 \times f \times L \times V_m^2}{d/4} \]

Where:

\( \Delta P_c \) — Pressure Drop in Circular Duct (Pa)
\( f \) — Friction Factor in Duct (dimensionless)
\( L \) — Length of Duct (m)
\( V_m \) — Mean Velocity of Air (m/s)
\( d \) — Diameter of Circular Duct (m)

Explanation: The formula calculates the pressure loss due to friction in a circular duct based on the duct's physical characteristics and airflow properties.

3. Importance of Pressure Drop Calculation

Details: Accurate pressure drop calculation is crucial for designing efficient HVAC systems, selecting appropriate fan sizes, and ensuring proper airflow distribution in duct systems.

4. Using the Calculator

Tips: Enter friction factor (dimensionless), duct length (m), mean air velocity (m/s), and duct diameter (m). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical friction factor value for ducts?
A: Friction factors typically range from 0.02 to 0.05 for smooth ducts, depending on the material and surface roughness.

Q2: How does duct diameter affect pressure drop?
A: Pressure drop decreases significantly with increasing duct diameter, as the formula shows an inverse relationship with diameter.

Q3: What is the significance of the 0.6 factor in the formula?
A: The 0.6 factor accounts for the specific relationship between friction, velocity, and pressure drop in circular duct systems.

Q4: How accurate is this calculation method?
A: This formula provides a good estimation for straight circular ducts but may need adjustments for elbows, bends, or non-circular ducts.

Q5: What units should be used for input values?
A: Use meters for length and diameter, m/s for velocity, and ensure the friction factor is dimensionless.