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Looking for some fan airflow/voltage figures

Discussion in 'Overclocking & Cooling' started by p4radox, 18 Jan 2006.

  1. p4radox

    Capodecina

    Joined: 1 Oct 2004

    Posts: 10,767

    Location: Prague

    Hi there,

    For my AS Physics coursework I'm doing a project involving measuring the airflow of a fan at various voltages. I need to compare the data I get with some official data for the airflow at various voltages for a specific fan. Can anyone link me to a data sheet or table with the relevant data for a fan? Preferably it'd be for an Akasa Amber, Antec, or Delta fan as already have these to hand.

    Thanks
     
  2. p4radox

    Capodecina

    Joined: 1 Oct 2004

    Posts: 10,767

    Location: Prague

    Right I'm going to reply to my own post. I just found this after a bit of searching:

    http://www.silentpcreview.com/files/fanspecs/fanspecs.pdf

    Looks like a fairly good comparison chart, although I don't own any of the fans on there, and I wonder about how hard it is to get hold of some of them in the UK...

    Anyone find any better/more concise charts with Deltas/Antecs/Akasas?

    Thanks :)
     
  3. p4radox

    Capodecina

    Joined: 1 Oct 2004

    Posts: 10,767

    Location: Prague

    Still looking, I'll have to buy a Panaflo or a Papst if I don't find any stats:(
     
  4. Benny

    Gangster

    Joined: 30 Nov 2005

    Posts: 370

    Location: London

    Hi Mate,

    Why don't you just approach the Fan companies themselves. I am sure they would be glad to help and share some of the data you require.

    Benny
     
  5. MikeTimbers

    Soldato

    Joined: 18 Oct 2002

    Posts: 6,911

    Location: New Eltham, London

    Also remember that most measurements will have been taken in "free air". And a fan in free air is not doing anything useful. Fans degrade exponentially as voltage falls when trying to move air through an obstruction.
     
  6. p4radox

    Capodecina

    Joined: 1 Oct 2004

    Posts: 10,767

    Location: Prague

    So does that mean that in a uniform wind tunnel (ie: a rolled up sheet of card) with no obstructions the airflow degrade exponentially when the voltage is dropped?

    Thanks:)
     
  7. MikeTimbers

    Soldato

    Joined: 18 Oct 2002

    Posts: 6,911

    Location: New Eltham, London

    Not as far as I know. In free air, the airflow will degrade linearly with reduced fan speed. Whether the fan speed degrades linearly with voltage will depend on the motor, and possibly the design of the blades. There are lots of variables here.
     
  8. p4radox

    Capodecina

    Joined: 1 Oct 2004

    Posts: 10,767

    Location: Prague

    Yeah that's what's confusing me:p. I'll report back with my findings when i finally do the thing. Thanks:)