Traditionally, reversible impellers are made using a standard airfoil impeller turning every second impeller blade 180 degrees. The problem
with this configuration is that when reversed the airflow can be reduced by as much as two-thirds due to the fact that the back of the blades
cannot generate as much airflow as the front.
Multi-Wing’s new range of reversible impellers with a newly developed blade profile is a landslide improvement when compared to traditional
standard airfoil impellers in reversible mode. The unique, state-of-the-art, symmetrical design of the new S-profiled impeller blade has been
developed to produce equal air volume in either direction, improving the peak efficiency to around 65 % which is approximately 10% points better
than what is known to the market today.
In the figures below you can see the impressive efficiency rates. When comparing the truly reversible TR7Z impeller with the standard airfoil 4Z
impeller in reversible mode, the difference is 16% point. In addition, sound is approximately 4dB lower than the 4Z impeller in a reversible
configuration.
For the comparison between the truly reversible
TR11W impeller and the standard airfoil 6W impeller in reversible mode, the difference is 14%
point in efficiency. Sound is measured to be approximately 4dB lower for the TR11W impeller than for the 6W impeller in reversible mode.
The curves are at 900 rpm (Click to see curves in full size)
Mounted with different hub sizes, with flange, conical shaft or straight bore, with aluminium or plastic blades, the TR7Z is available in diameters
up to 1095mm in a 16 bladed hub, and the TR11W in diameters up to 1604mm in a 13 bladed hub.
The truly reversible impellers are designed for a variety of very different applications such as wood, crop and brick drying, radiator cooling,
tunnel ventilation, and fruit ripening rooms.
Contact Multi-Wing International a·s to learn how the new range of reversible impellers can improve your application.
