Industrial air fans are used to ventilate and cool large areas in warehouses or factories. These permanent fans are installed in ducts and run intermittently throughout the year.
Power Calculation
To calculate the power drawn by the industrial air fan's motor, an engineer can use the following formula: average voltage x average current x the square root of 3 x the power factor all divided by 1,000. The power factor is the ratio of real power to apparent power in a circuit.
Energy Use and Cost Calculation
The power drawn by the motor found in Section 1 can be used to find out how much energy the industrial air fan uses and how much it costs to run annually. By multiplying the power by the hours in which the fan operates, an engineer can determine the energy used by the fan. By multiplying the energy usage by the electric rate, which the electric utility powering the fan determines, the cost of operating the fan in a year can be determined.
Inefficiencies
There are a number of ways to tell whether the industrial air fan system is operating inefficiently: dampers, which restrict air flow in a duct, are closed or suddenly turning; a frequently overloading motor; loud and excessive vibrations and noise; and the need for frequent repair to the ductwork all suggest the fan is running inefficiently.
Tags: power drawn,