Air Flow Coefficient Calculator

Formula

To calculate the air flow coefficient (C):

\[ C = \frac{Q}{\sqrt{\Delta P}} \]

Where:

\( C \) is the air flow coefficient
\( Q \) is the air flow rate (CFM)
\( \Delta P \) is the pressure difference (inches of water column)

Air Flow Coefficient Definition

The air flow coefficient is a parameter that measures the efficiency of an air flow system, such as a duct or a valve. It indicates how efficiently the system can move air given a certain pressure difference. A higher air flow coefficient means that a greater volume of air can be moved for a given pressure difference, which implies a more efficient system. This coefficient is crucial in designing and analyzing HVAC systems, ventilation systems, and other applications that involve air movement.

Example Calculation 1

Let's assume the following values:

Air Flow Rate (Q) = 500 CFM
Pressure Difference (ΔP) = 25 inches of water column

Using the formula:

\[ C = \frac{500}{\sqrt{25}} = \frac{500}{5} = 100.0000 \]

The air flow coefficient (C) is 100.0000.

Example Calculation 2

Let's assume the following values:

Air Flow Rate (Q) = 1000 CFM
Pressure Difference (ΔP) = 100 inches of water column

Using the formula:

\[ C = \frac{1000}{\sqrt{100}} = \frac{1000}{10} = 100.0000 \]

The air flow coefficient (C) is 100.0000.