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  #21 (permalink)  
Old 18th October, 2001, 10:07 AM
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I seem to remember it reduces the specific heat capacity, but I'm not sure
Putting anything in water will reduce its cp and yes, tri-ethylene glycol does impair the heat transfer properties of water quite markedly. Unfortunately, so does freezing it.

In >0ºC applications, you should get better results with no additives to the water - the actual effectiveness of wetting agents for the amount they cost is less than just pumping the water a little faster.
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Old 18th October, 2001, 10:15 AM
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Absolutely right - ice is not a good cooling fluid
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Old 23rd October, 2001, 02:17 AM
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Why not just mod a dorm style fridge into a case and then take a second compresser and hook it up to the CPU so that your keeping the ambient temps as low as will allow and then by using the other compresser you coll the CPU to even lower than what you could have gotten with only the 1 compresser. Also if you keep the temps lower in the case you have less to worry about with pin frost.
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Old 23rd October, 2001, 09:07 AM
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Originally posted by AmbientFiction
Why not just mod a dorm style fridge into a case and then take a second compresser and hook it up to the CPU so that your keeping the ambient temps as low as will allow and then by using the other compresser you coll the CPU to even lower than what you could have gotten with only the 1 compresser.
Cuz unless you do it right, you find that one of the cooling stages is working far too hard trying to extract all that extra heat. Don't forget that any heat pump adds its own heat to that of the heat it's pumped.

From what I've heard, it's not worth doing a multistage design unless you want to be below -140C. -140C is acheivable with a single stage design!

AidanII
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Old 23rd October, 2001, 09:48 AM
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Why not just mod a dorm style fridge into a case and then take a second compresser and hook it up to the CPU so that your keeping the ambient temps as low as will allow and then by using the other compresser you coll the CPU to even lower than what you could have gotten with only the 1 compresser. Also if you keep the temps lower in the case you have less to worry about with pin frost
Let me see if I understand you:

Idea 1) You plan on using one refrigerator unit to cool the air inside the entire case, and the other refrigerator/compressor unit to cool the CPU directly?

You can, but it's a futile effort:

* You'll get no better performance out of the CPU cooling circuit - its mechanicals (compressor, radiator, fan) are too large to mount on top of the CPU and must be somewhere else. Their ambient temperature will be the same with or without the second cooler.

* The cooler inside the case might take the average air temperature down to say, 10ºC with no trouble, but its surface temperature will be in the region of -120ºC. It will be allowed to reach ~2ºC before the compressor cuts back in again (depends on where the system thermostat is). This will fill your case with water in the space of a few minutes.

Idea 2) You plan to use one refrigeration circuit to cool the CPU, and put the radiator from that circuit into another refrigerator?

As AidanII said, you'd need a bigger fridge to sink the heat from the first. It would be ridiculously inefficient, since you don't have that large a heat duty to get rid of.

Multi-stage refrigeration is used only for a few specialist applications, typically cryogenics and gas liquefaction/fractionation.

Idea 3) You plan on filling a dorm style fridge with beer, then using a second fridge unit to cool your chip.

Now that's a good idea
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