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The air flow (CFM) through a centrifugal blower can be calculated using the following formulas:
Suction Opening Area: \( \text{Area} = \pi \times r^2 \), where \( r = \frac{D}{2} \)
Air Flow (m³/s): \( \text{Air Flow (m³/s)} = \text{Area (m²)} \times \text{Velocity (m/s)} \)
Air Flow (m³/h): \( \text{Air Flow (m³/h)} = \text{Air Flow (m³/s)} \times 3600 \)
Air Flow (CFM): \( \text{Air Flow (CFM)} = \text{Air Flow (m³/h)} \times 0.588577 \)
- \( D \): Diameter of the suction opening (in meters).
- \( r \): Radius of the suction opening (\( r = \frac{D}{2} \)).
- \( \text{Velocity} \): Air velocity at the suction opening (in m/s).
- \( \text{Area} \): Cross-sectional area of the suction opening (in m²).
- \( \text{Air Flow (m³/s)} \): Air flow in cubic meters per second.
- \( \text{Air Flow (m³/h)} \): Air flow in cubic meters per hour.
- \( \text{Air Flow (CFM)} \): Air flow in cubic feet per minute.
For a centrifugal blower with a suction opening diameter of 1 meter and an air velocity of 4.7 m/s:
1. Suction Opening Area: \( \text{Area} = \pi \times \left(\frac{1}{2}\right)^2 \approx 0.785 \, \text{m²} \)
2. Air Flow (m³/s): \( \text{Air Flow (m³/s)} = 0.785 \times 4.7 \approx 3.6895 \, \text{m³/s} \)
3. Air Flow (m³/h): \( \text{Air Flow (m³/h)} = 3.6895 \times 3600 \approx 13282 \, \text{m³/h} \)
4. Air Flow (CFM): \( \text{Air Flow (CFM)} = 13282 \times 0.588577 \approx 7818 \, \text{CFM} \)
This calculator helps determine the air flow (CFM) through a centrifugal blower based on the suction opening diameter and air velocity, useful in industrial applications like air handling units and boiler fans.
Yes, the calculator supports various units for diameter (meters, cm, inches, feet) and velocity (m/s, ft/min). All inputs are converted to standard units for accurate calculations.
Air velocity can be measured using an anemometer at the suction opening of the blower. Take multiple readings at different points and calculate the average velocity.
Entering zero for the diameter will result in an area of zero, leading to an air flow of zero. Please ensure the diameter is greater than zero for meaningful results.
The results are displayed in multiple units (e.g., m² and ft² for area, m³/s, m³/h, and CFM for air flow) to allow you to use the value in your preferred unit.