Based on an intensive research program, it has turned out that it is possible to reduce the sound power level of cooling fans with 3 to 8 dBA by the extreme application of more or less known effective principles like wider blade cord and swept leading edge line. Following international recognized measuring standards; the measuring results will be presented as well as consequences for cooling tower design and cooling fan construction.
93-03: Reduction of Noise Generation by Cooling Fans
Ir. Henk F. van der Spek, Ventilatoren Sirocco Howden B.V