Fan Velocity Calculator

Calculate Fan Velocity



Formula

To calculate the Fan Velocity (Vfan):

\[ V_{fan} = \frac{CFM}{\left(\pi \left(\frac{D}{12}\right)^2 / 4\right) / 60} \]

Where:

What is Fan Velocity?

Fan velocity describes the speed at which a fan moves air through its blades. It is a crucial parameter in the design and selection of fans for various applications, including ventilation, cooling, and air circulation. Higher fan velocity indicates a more powerful fan capable of moving air faster, which can be essential in environments requiring efficient air movement.

Example Calculation 1

Let's assume the following values:

Using the formula:

Step 1: Calculate the area of the fan:

\[ \text{Area} = \pi \left(\frac{D}{12}\right)^2 / 4 = \pi \left(\frac{24}{12}\right)^2 / 4 = \pi \times 4 / 4 = \pi \]

Step 2: Calculate the fan velocity:

\[ V_{fan} = \frac{2000}{\pi} / 60 \approx 10.61 \text{ ft/s} \]

The Fan Velocity is approximately 10.61 ft/s.

Example Calculation 2

Let's assume the following values:

Using the formula:

Step 1: Calculate the area of the fan:

\[ \text{Area} = \pi \left(\frac{D}{12}\right)^2 / 4 = \pi \left(\frac{18}{12}\right)^2 / 4 = \pi \times 2.25 / 4 = \pi / 1.7778 \]

Step 2: Calculate the fan velocity:

\[ V_{fan} = \frac{1500}{\pi / 1.7778} / 60 \approx 7.96 \text{ ft/s} \]

The Fan Velocity is approximately 7.96 ft/s.