Re: OT: Refrigeration Compressor fix
- From: Mike Monett <None@xxxxxxxx>
- Date: Sun, 07 Sep 2008 19:19:01 +0000
OT: Refrigeration Compressor fix
"Jon Slaughter" <Jon_Slaughter@xxxxxxxxxxx> wrote:
> Not really the right newsgroup but since your family!
> I was cooling my computer using oil and a refigerator compressor I
> tore out of an old mini-refigerator I had back from school.
> It was working well keeping my computer's temp at least 10
> degree's or more cooler(initially it would be at 10-15 degree's
> celsius and ramp up to about 30-35. Without the cooling it runs
> about 45-50(with oil) which is what it runs with just air cooling.
[...]
> Any ideas?
Overkill. If you are running at 45C-50C you should be fine.
Most cpu's have a maximum temperature between 65C and 95C. The
problem is electromigration, which increases with temperature. But
if you are below the max specified, you should expect long life.
See the following for a brief list of max cpu temperatures:
http://www.heatsink-guide.com/maxtemp.shtml
See Chris Hare's "Processor Electrical Specifications" page for more
maximum cpu temps:
http://users.erols.com/chare/elec.htm
If you want to reduce the cpu temperature a bit, clean the lint and
dirt from the heat sink and fan. I use a bit of diluted dish
detergent and wash it off with running water. Hold the fan face up
or at 45 degrees to keep soapy water out of the bearings so they are
not damaged. Use a scrub brush with long bristles to clean down
inside the heatsink fins.
Be sure to clean the main chassis and power supply fans also. As
long as you are there, use a vacuum to clean the lint and dust from
inside the computer. I use an ordinary paint brush from the dollar
store to clean the lint from the capacitors and memory cards. I have
not had any problems with ESD.
I found the expensive silver heatsink paste to be a waste of money.
It is difficult to get a thin uniform coat, and the silver particles
don't conduct heat as well as claimed. The particles are not in very
good contact so they don't act like solid silver. (I use pure silver
wire in some applications, and it conducts heat extremely well.)
Instead of silver paste, I use a thin coat of plain high-temperature
marine grease applied to the heatsink and the cpu. When installing,
move the heatsink sideways and rotate it slightly to eliminate any
air bubbles.
The cpu temperatures are almost identical to the results with silver
paste, around 40C to 41C. I think the reason is the film of grease
is much thinner than the silver paste, so the thermal conductivity
is pretty good. Anyway, 40C is fine.
I reversed the main fan to blow cool air into the computer instead
of out, and cut a small baffle from a polystyrene jug to direct the
cool air over the cpu heatsink. You have to figure out how to mount
the baffle. In my case, there was a convenient stud, so I cut a slot
in the edge of the baffle and let it sit on the stud.
If you still want to lower your cpu temperature, get a bigger
heatsink and add a cooling baffle.
Another area to watch is the disk drive temperatures. The drives are
often enclosed with poor air circulation, so they get hot and will
die early. If so, you need to add a small fan to bring in cool air.
With a clean system, I was able to add small resistors in series
with all the fans to slow them down. This eliminated the constant
whine and still keeps the cpu temperature well in the safe region.
Good luck.
Regards,
Mike Monett
.
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