Looking for some fan airflow/voltage figures

[p4radox]

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

 

[p4radox]

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

 

[p4radox]

Still looking, I'll have to buy a Panaflo or a Papst if I don't find any stats

 

[p4radox]

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.

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

 

[p4radox]

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.

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