AxiEco – high-efficient fan system

The system efficiency of a motor-driven fan results from multiplying the efficiencies of its individual components. In the case of a fan with EC motor, these are the components motor, commutation electronics and aerodynamic unit. Today's EC motors achieve efficiencies of up to 94 %, depending on the design and power, and commutation electronics achieve efficiencies of up to 96 %.
The greatest potential for improving the overall efficiency of the fan system lies in the aerodynamic part. Using an axial fan as an example, we will look at the progress made in improving efficiency in recent years. It is obvious that not only the fan impeller alone is responsible for the efficiency, but also other aerodynamically relevant components such as nozzles, guard grilles, diffusers or guide vanes. If we consider the fan system as part of a larger unit, it becomes clear that not only the efficiency of the fan alone has a positive effect on the efficiency of the entire unit, but that the air performance characteristics also play a role. Let's take an evaporator for a cold room as an example. Higher fan efficiency results in lower power dissipation and thus lower waste heat. Consequently, less heat is introduced into the refrigeration system, so less electricity is needed for the refrigeration cycle. In addition, a pressure-stable air performance characteristic has the positive effect that the evaporator can be operated for a much longer time before defrosting becomes necessary. This means that fewer defrost cycles are required in a given operating period, significantly improving the overall efficiency of the refrigeration unit.