Fan Energy Index Calculator

Formula

The formula to calculate the Fan Energy Index (FEI) is:

\[ FEI = \left(\frac{Q_{actual}}{Q_{standard}}\right) / \left(\frac{P_{actual}}{P_{standard}}\right) \]

Where:

\( FEI \) is the Fan Energy Index.
\( Q_{actual} \) is the actual airflow delivered by the fan (cubic feet per minute).
\( Q_{standard} \) is the standard airflow for the fan type (cubic feet per minute).
\( P_{actual} \) is the actual power input to the fan (watts).
\( P_{standard} \) is the standard power input for the fan type (watts).

What is a Fan Energy Index?

The Fan Energy Index (FEI) is a metric that measures the energy efficiency of fans. It is calculated by comparing the energy consumption of a fan to a baseline energy consumption. The higher the FEI, the more energy-efficient the fan is. This index was developed by the Air Movement and Control Association (AMCA) and is used to comply with energy efficiency regulations and standards.

Example Calculation

Consider an example where:

Actual Airflow (Q_actual): 5000 CFM
Standard Airflow (Q_standard): 4500 CFM
Actual Power Input (P_actual): 750 W
Standard Power Input (P_standard): 800 W

Using the formula to calculate the Fan Energy Index:

\[ FEI = \left(\frac{5000}{4500}\right) / \left(\frac{750}{800}\right) = 1.11 / 0.9375 = 1.18 \]

This means that the Fan Energy Index for this example is approximately 1.18.