Why Does VFD Control Save Energy?
There are two common ways to adjust airflow in fans: one is by using a damper, and the other is by adjusting the fan speed.
A damper reduces airflow by artificially increasing system resistance. The fan still runs at a relatively high speed, and much of the energy is wasted through throttling.
Speed control works differently. It directly reduces the workload of the fan. When the demand decreases, lowering the fan speed reduces the airflow, and the power consumption drops significantly.
For example, when the fan speed is reduced to 80% of the original speed, the airflow decreases to about 80%, the pressure drops to about 64%, and the power consumption can decrease to around half.
Therefore, in applications with large load variations, variable frequency control is much more energy-efficient than continuously using dampers for adjustment.
Variable frequency drives are widely used in air conditioning supply and exhaust systems, dust collection systems, cooling ventilation, and cleanroom ventilation.
However, a variable frequency drive is not a universal solution. If the fan is undersized, VFD control cannot solve the problem. If the duct system has excessive resistance, a VFD cannot replace proper system optimization.
The right approach is to select the correct fan and design the duct system properly first, then apply energy-saving control methods to achieve reliable and efficient operation.
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