Increasing the Energy Efficiency of a Ventilation System by Applying Frequency Control

The electric motor is one of the most important components of industrial equipment, which are crucial for the efficiency of industrial processes. The majority of electric motors are used to drive fans, pumps and compressors.It is a known fact that this operating machinery equipment works at a constant speed at all times, even when this is not necessary, using throttles or valves to control the flow of liquids or gases. This in itself leads to huge costs for electricity and generating large amounts of carbon emissions, which is unnecessary and completely preventable.Electric drives with frequency regulators control the electric motor performance and adapt its speed and torque exactly to the requirements of the respective equipment, the advantages being energy saving and improvement of technical characteristics in industrial enterprises.Paper deals with determination of the variable electric power and energy losses in an electric motor driving a centrifugal fan when applying frequency control.