Factors Contributing to Noise Level in Recirculation Fans

With summer approaching, recirculation fans become essential heroes for preventing heat stress in cows and maintaining a comfortable environment for farm workers. For optimal barn comfort, both fan performance and noise levels matter significantly.

What factors influence noise levels in recirculation fans? Our fan specialist from SKOV, Michael Thing Knudsen, has identified the most significant factors, with number 1 being the greatest:

1. Tip Speed   

Tip speed is the velocity at the outermost edge of the fan impeller blades. This is determined by both blade diameter and rotational speed (RPM). Larger diameters and higher RPMs create greater tip speeds, resulting in higher noise levels.

2. Fan Capacity

Fan capacity affects noise through maximum operational RPM—higher maximum speeds produce more noise. Capacity is influenced by a combination of blade quantity, fan pitch, and blade design. The number of blades has the most significant impact; more blades generally create more noise. Fan pitch and blade design are closely related factors. Even fans with low tip speeds can generate considerable noise when the blade design is not optimized.

Our recirculation fans combine powerful performance with quiet operation through advanced engineering design.