ENERGY SAVING IN AIR SUPPLY UNIT BY IMPLEMENTING VARIABLE FREQUENCY DRIVE.

Electrical Engineering

In Air Supply application required variable flow control of air. In the traditional method of such flow control, induction motor is run at full speed and then control the flow by damper control method. But this method has few drawbacks i.e. limited adjustment of flow; it increases the resistance to flow, not energy efficient method. As per the fan affinity law where the load torque and power vary with the square and cube, respectively of the speed. So Air Supply Unit can save energy when they are operated at variable speed operation, by implementing variable frequency drive. Such energy saving method is used in variable torque centrifugal fan application, where the load torque and power vary with the square and cube, respectively of the speed. This change gives a large power reduction compared to fixed speed operation for a relatively small reduction in speed. Also by Using a variable frequency drive to control the air flow with a fully open damper saves a considerable amount of power. As most of the drives operate at part load most of the time, the accumulated energy saving may be substantial over a prolonged period of time. Because this type of air flow control is common in industry, widespread application of variable-frequency drives with power electronics area can help in large energy conservation. The main propose of this paper is to save the energy in air supply unit by the implementation of VFD and hence the proper control of air flows is achieve.

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