What is the indoor air flow for an electric furnace given specific supply and return air temperatures, voltage, and current draw?

To determine the indoor air flow for an electric furnace based on supply and return air temperatures, voltage, and current draw, we use the principles of thermal dynamics and airflow calculations.

When considering air flow in heating systems, one calculates the amount of heat delivered by the furnace relative to the temperature change of the air. The formula typically used in such calculations is:

[ Q = CFM \times \Delta T \times 1.08 ]

Where:

• ( Q ) is the heating capacity in BTUs per hour.

• ( CFM ) is the airflow in cubic feet per minute.

• ( \Delta T ) is the temperature rise (the difference between the supply air temperature and return air temperature).

• 1.08 is a constant that represents the weight of 1 cubic foot of air and the conversion factor for air heating.

Using the values for voltage and current draw, you can calculate the heat output in BTUs, and then rearranging the formula allows you to solve for the airflow. If calculations lead to an air flow of 1,170 CFM, that aligns with the specific conditions and accumulates the potential heat output of the unit based on the given supply and return temperatures.

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