E.U.N.U.C.H.

From: Aaron Christopher Finney <af-list_at_is1.wfi-inc.com>
Date: Wed Nov 17 15:40:07 1999

On Wed, 17 Nov 1999 Philip.Belben_at_pgen.com wrote:

> Anyway, it seems to me that the way to go is:
>
> 1. Peltier chip between CPU and heatsink. Heatsink is a large block of copper.
>
> 2. Use a refrigerant cycle similar to a domestic freezer, but connect the
> refrigerant circuit directly to holes bored in the heatsink block. No
> intervening water circuit.
>
> 3. Of course, keep the refrigerant radiator well away from the system, and
> supply it with plenty of fans...
>
> 4. Finally, try not to spill refrigerant if it's one of those chlorinated
> organics that the environmentalists are always going on about. It won't do any
> good (although a discussion of whether it does harm is decidedly off-topic), and
> will be well-nigh impossible to replace...


One issue with copper is the cost. I can buy .5" x 4" aluminum barstock at
around $2.00 a foot (I'm sure our friends in Europe love these units of
measurement). It's also relatively easy to bore through with a
high-quality drill bit if cooled with running water. Also, if I happen to
screw up and drill through the side I don't cry as much...

For my current peltier-based setup, I have to use a coldplate against the
cpu itself because I'm using multiple TECs in the design. After getting
some help with actually arranging the different variables into a useable
equation, I was pleasantly surprised to find that the temperatures were
within +/- 3C of my calculations.

One last note about using a water-exchanger in this setup (and then I'll
shut-up, I promise), is that it's nice not to have to worry about cooling
the inside of the case too! Also, it doesn't sound like a jet-engine
starting up...the pump is more like the pleasant gurgle of an aquarium.

So off-topic it hurts,

Aaron
Received on Wed Nov 17 1999 - 15:40:07 GMT

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