[Beowulf] Desktop fan reccommendation

Vincent Diepeveen diep at xs4all.nl
Wed Jun 6 09:36:08 EDT 2012


How much airflow per square centimeter do they generate?

As for the cluster here plenty of space available. To rent office  
space is around a 50 euro a square meter a year over here,
not sure about there. So the cluster, some cardboard and huge fans of  
14 and 18 CM are diong the job to cool the nodes
and switch, mellanox of course. now as i understand the square meters  
they reserve for datacenters is always far too limited,
causing space each node eats as important as well, yet that's not the  
problem here in my office.

The thing that worries me more is the airflow to outside (and  
inside). Usually only have limited amount of square centimeters of
tube there. The 'industrial' fans that have massive airflow, they're  
very very noisy.

I'm already wondering about using some massive cardboard box and blow  
in air there using 8 fans (@ 100CFM each) or so
and then behind them a second layer of fans, around 6 @ 100CFM,  
creating a massive overpressure, hoping that this will
generate more airpressure, enough to blow in and blow out through  
some meters of tubing, but seems not like a perfect solution to me.

On Jun 6, 2012, at 2:42 PM, Prentice Bisbal wrote:

>
> On 06/06/2012 05:38 AM, Daniel Pfenniger wrote:
>> Nathan Moore wrote:
>>> All,
>>>
>>> This is barely beowuf related...
>>>
>>> New desktop machine is a Shuttle SX79R5,
>>> http://us.shuttle.com/barebone/Models/SX79R5.html
>>>
>>> In the past, shuttles have been very quiet, but this one has a  
>>> fairly loud
>>> variable speed fan on the CPU heat exchanger.  I normally buy  
>>> replacement parts
>>> from vendors like newegg, but their selection of 90mm case fans  
>>> mainly seems to
>>> be described by CFM and whether the fan has LED lights mounted in  
>>> it (FYI, that
>>> is not a selling point).
>>>
>>> So, is there an engineer's version of newegg that ya'll know  
>>> about? There must
>>> be a super quiet 90mm fan out there that I can pick up for $10...
>> I remind ads for quiet and more efficient rotor-less fans for PC's  
>> but
>> cannot find such products anymore.
>>
>> The idea was to maximize the air flow area by displacing the  
>> central motor
>> to the blade edges.  Not only the larger central area would allow  
>> a lower,
>> quieter blade speed, but the blades being accelerated at their  
>> extremities
>> by the circular motor would be mechanically more stable, less  
>> subject to
>> vibrations.  My guess is that such fans, although technically  
>> better, were
>> too expensive in regard of the advantages.
>>
> I had one of these fans on one of my CPU heatsinks a few years ago. It
> was much quieter than the fan it replaced,but still not all that quiet
> when compared to a Dell or HP tower. I forget the name of the
> manufacturer or the model. The last time I looked, I couldn't find  
> them
> anywhere.
>
> --
> Prentice
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