jeffc said:That's exactly what I said. I got flamed by Isaac Kuo who said I didn't get
it, and "They aren't next to each other. The intake is at the top rear. The
exhaust is at the front bottom." I don't know what Isaac is looking at, but
it doesn't seem to be what we're looking at. So I repeat what I said - it's
not a very good design. Just like you need a baffle for a loudspeaker
(don't set woofers sitting bare on your rear car deck), likewise you should
not be intake and exhaust fans right next to each other. They have a
tendency to cancel each other out and you get much reduced airflow over your
motherboard.
Rob Morley said:Air intake is via the aperture at the rear below the PSU - it is ducted
over the CPU heatsink, and then leaves the case either through the PSU
or through the filter box underneath. This is a departure from standard
practice because the inside of the case is at reduced pressure, and some
of the exhaust is via the bottom front of the case. So it goes against
convection within the case, and the air box and PSU are fighting each
other for air.
I reckon it's an ill-conceived design, but it's quite
possible that it keeps everything cool and quiet. I wouldn't do it that
way though.
Parish said:Ah right, I went back and re-read Isaac's post and I see what you mean.
There _is_ an exhaust in the bottom of the case (in the wooden plinth
it's sat on) _as well as_ the PSU exhaust. This is what Rob Morley meant
when he said they (the base and the PSU exhausts) were fighting each other.
The base exhaust is detailed in part three of the article,
http://www.silentpcreview.com/article108-page1.html
"Isaac said:Another way to look at it is that the air box and the PSU are
working with each other to pull air through the CPU heatsink.
Thus, the CPU receives the maximum amount of airflow, as well
as the freshest, coolest, air. In modern computers, this
makes sense since the CPU generates so much more heat and
require so much more cooling, while PSU cooling requirements
haven't really changed.
Why do it any other way? Filtration and muffling combined, no need forBluefront's latest design is a less extreme mod featuring
the bottom filter as air intake rather than exhaust.
It just seems odd to me to go against the flow, even though it'sStill, the importance of upward convection force is vastly
overrated, IMHO. Any fan, even a very slow turning
silent 120mm, will overwhelm the miniscule convection force
unless the case is running VERY hot.
My HTPC relies entirely on one slow moving thermistor
controlled PSU fan, pulling air downward from the only
intake at the top to the only exhaust at the bottom.
This machine runs pretty cool, so convection force is
negligible.
Perhaps an ionizer in your PC room would help? I have one, and they
clean the air silently. It's not just good for the PC, it's good for
you.
A lot of Antec cases are designed with washable front filters so as toSorry I missed the beginning of this thread (ISP problems) and I think it
might have come up before, but anyway:
The solution I use to keep the inside of my PCs clean in a dusty environemt
is quite cheap and simple.
In factories making things like cameras or watches, which require clean air,
they filter all the coming in to the assembley rooms and have a very slight
positive pressure so that clean air flowing out stops any dirty air getting
in. You can do the same with a PC case by simply arranging for two things:
1) Make sure that air is drawn into the case by intake fans more strongly
than it is sucked out by exhaust fans.
2) Use filters over the intake fans and keep them clean.
Most PSUs have a fan which exhausts air from the PC case, it is inadvisable
and unnecessary to mess with this.
Most PC cases have provision for mounting at least two 80mm fans - either
one in front and one at the back or two at the front. Sometimes the cut-outs
in the case can accept larger fans - even better. Filters which mount on the
outside of the case using the fan mounting screws are available widely and
cheaply, and the outer part of the shell easily unclips to clean the filter
element. Most PC cases have many holes in them. Using this arangement will
ensure that air flows out through these holes so that dirty air is not
sucked in.
Using bigger fans, or more fans, carries the added bonus that you can reduce
the fan speed to cut down the noise and still get adequate air flow. You
only need a steady movement of air in most cases, not a massive blast. The
filters may slow the air flow down, but only very slightly. They will also
serve to reduce the noise from the fans a little.
Hope this helps - it works for me.
Kevin.
|| Dorothy Bradbury wrote:
|||
|||| in a house that gets dusty (it's being restored)
|||
||| So industrial environment - continual brick/wood/cement dust
||
|| Perhaps an ionizer in your PC room would help? I have one, and they
|| clean the air silently. It's not just good for the PC, it's good for
|| you.
|
| Not sure if an ionizer would help that much with the large quantity of
| large dust particles building work creates, but generally I think
| they're great. Put it on a piece of paper though, as the crap it pulls
| out of the air will accumulate on whatever you put it on.
|
|
| Tim
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