Adaptation of the air flow to actual requirements is a crucial factor with regard to the energy consumption of a system. With AC fans, this is often achieved by switching individual fans on and off. By contrast, GreenTech EC fans feature integrated, infinitely variable speed control enabling the air volume to be adjusted as needed. The power consumption Pe drops drastically (P~n³) on reducing the speed n.
The enormous potential for savings is illustrated by a simple calculation example: In nominal operation, an installation with four fans arranged in parallel has a power consumption of 40 kW. If, on an annual average, this installation is operated at the design point for 50% of the time and at half the rated air flow for 50% of the time, energy savings of 65 MWh per year can be obtained.