9 Sep
2010
9 Sep
'10
5:24 p.m.
Kevin Cosgrove:
My seemingly hidden point was that when the hot stuff is at the top,
and the air exit is at the top, then the whole case will run cooler.
A cooler case means the fans can run more slowly. Slower fans mean a
quieter system, and that is good for audio work when the system is in
the room where audio is created or enjoyed.
Your point was not hidden, it was wrong. Some of the hot stuff is
also the stuff which is sensitive to heat. If you put the CPU
and the PSU at the top of the case, they will be heaten up by
hard drive, motherboard, etc., and they will cause more noise
than if you had putten them at the bottom.
raise the heat of all the rest of the things in the
case above them.
I would rephrase that to avoid putting things which are sensitive
to heat at the top, and avoiding putting things which are hot
close to things which are sensitive to heat.
Normally you only have to worry about the temperature of the CPU
the PSU. The other stuff inside an audio-computer
usually works fine in higher temperature without making
lots of noise or failing. (at least to a certain degree of corse). 
9 Sep
9 Sep
5:35 p.m.
New subject: New workstation | DAW pc
On 9 September 2010 at 17:24, "Kjetil S. Matheussen"
<k.s.matheussen(a)notam02.no> wrote:
Your point was not hidden, it was wrong. Some of the
hot stuff is
also the stuff which is sensitive to heat. If you put the CPU
and the PSU at the top of the case, they will be heaten up by
hard drive, motherboard, etc., and they will cause more noise
than if you had putten them at the bottom.
You might be right. I haven't done the experiments myself to
determine which ends up being cooler. All my comments were
based on a research paper I read on how to keep rack mounted
test equipment cool and reduce the number of failures due to
heat in the rack. Their conclusion was to put the power supply
(especially) and other hot gear at the top of the rack, near the
exit vent and fan. They demonstrated lower temperatures and
lower failures by doing so. I extrapolated to computer cases,
and maybe that was a mistake.
The classic computer tower designs I see are power supplies at
the top with their own exit fans, and CPUs right below the power
supply with a case fan blowing in on the CPU and a CPU cooler
drawing air from there and blowing it away from the CPU.
Does anyone know of any research papers on tower style computer
cooling? Of special interest would be reports related to
placement of heat sources, cool air intake and hot air exit
vents.
Thanks...
--
Kevin
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Kjetil S. Matheussen