Air cooled Exhanger Fan- Noise Data
Air cooled Exhanger Fan- Noise Data
(OP)
In the Noise Data sheet submitted by a vendor for an air cooled Heat Exchanger FD fan , the sound pressure level at various octave band centre frequecies is ranging between 93dBA to 64dBA and the average is mentioned as 85dBA. Also it is indicated that this is measured one metre below the equipment. Should the SPL be within 85dBA at various frequency bands or the average value is O.K.? Whether we should insist for the SPL at one metre beside the equipment also? Pl advise





RE: Air cooled Exhanger Fan- Noise Data
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Air cooled Exhanger Fan- Noise Data
RE: Air cooled Exhanger Fan- Noise Data
If you need the SPL where you are indicating then ask for it, but don't be surprised if they charge you for measuring it. I believe the EU standard suggests using sound power (SWL) rather than SPL at 1m.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Air cooled Exhanger Fan- Noise Data
RE: Air cooled Exhanger Fan- Noise Data
One 90 dB band, with the rest 65 dB (wildly unrealistic) would result in 91 dB OAL
http://www.sengpielaudio.com/calculator-spl.htm
RE: Air cooled Exhanger Fan- Noise Data
RE: Air cooled Exhanger Fan- Noise Data
Walt