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small fanless PSU

S

scoob8000

2[H]4U
Joined
May 4, 2002
Messages
2,834
Can anyone suggest a small fanless power supply? 50-80 watts max should suffice.

It's for a linux router which I'm trying to make completely quiet. It needs only power a AMD k6-200, board and two nics..

-scoob8000
 
nothing comes to mind offhand, but wouldnt that be an AT PSU?
would think that if it needs to be small in the physical form factor sense
that simply stripping it out of the case as a mod might have potential
considering that a more powerful older AT PSU would likely have heatsinks up to the task of dumping the heat produced from inefficiency on say 300Watt full load, passively at 50 > 100 watts
its not producing more watts than the draw,
its efficiency is likely less in that range,
but a lower efficiency on 50 watts compared to a higher efficency at 200 watts
is still alot less heat
situated where natural convection can assist (or some ducts to augement that) could work out quite nicely
 
The board I'm using actually can accomodate AT and ATX psu's, but I prefer to go with ATX for future usability.

Small isn't so important I suppose. I would like to move everything into a micro ATX case from the full desktop ATX case it's in now though.

-scoob8000
 
points to consider

fanless designs basically have to have larger heatsinks to increase the heat transfer interface
the exchange to the fluid (air) is solely through natural convection

unless your able to find such an animal a larger capacity PSU will have larger heatsinks to transfer the heat of the higher load under forced convection (fan driven)

many manufacturers offer bare board PSU (open frame) that likely would be passively cooled through natural convection
http://www.fsp-group.com.tw/english/02_products/01_overview.asp

General Heat Transfer
Convective Cooling < (duct\chimney draft cooling)


might have an audience with more experience in this niche in the SFF forum

mike has reviewed several fanless ATX > http://www.silentpcreview.com/section4.html
 
Actually the article on silentpcreview using the TKPower PSU is what gave me the whole idea..

Cannot seem to find anyone that sells it though.


The Morex line that was mentioned looks like it would suffice as well.

-scoob8000
 
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