In response to a requirement from one of our customers we have
developed a new fan blade called 5W. Our customer has a demand for impellers with optimum performance
in diameters with 1000mm and 1120mm. The impellers are used in various cooling applications such as
evaporators and air-cooled condensers. Previously they have used 9 and 12-bladed 5Z impellers but in
some cases this solution proved not to be strong enough. In these cases they used a 6W solution. However,
in the long run the 6W solution was too high priced and the pressure created by the 6W was also too high.
Hence one of the important design parameters was to come up with a more inexpensive solution, and to take
out some of the pressure from the 6W blade.
Therefore, the 5W is a shorter and slimmer version of the 6W blade. With a length of 426,8mm it can reach
1127,6mm in a 5 or a 6-bladed W retaining plate. Due to the requirement from our customer this blade is
initially available in an L version and in AL only.
Below is the performance of a 990mm diameter impeller tested in a 1000mm diameter duct in our in-house wind tunnel.
