What happens to motor amps when the temperature of air handled by a centrifugal fan is lowered?

When the temperature of the air handled by a centrifugal fan is lowered, the density of the air also decreases, which can lead to an increase in the volume of air the fan needs to move. Since centrifugal fans are designed to move a certain amount of air based on their design, operating conditions, and efficiency, lower temperature air means less air resistance and potentially a higher flow rate to maintain the desired airflow.

As the resistance decreases, the fan generally requires more power to achieve the same performance, which results in an increase in the electrical current (amps) drawn by the motor. This is because the motor compensates for the increased demands of moving a larger volume of this denser air. Therefore, in this operational context, the motor amps will indeed increase as the fan works harder to maintain airflow at the lowered air temperature.

Understanding the relationship between air temperature, density, and how that affects the load on an electric motor is critical for predicting motor performance and efficiency in various conditions.