Weird water cooling question

I am not positive, but evaporation speeds will have nothing to do with how much heat it can hold/carry. The specific heat of acetone or rubbing alcohol might be much lower than water, making it much less effective. Remember this is a closed circuit, so no evaporation can occur.

Try checking into the specific heat of various compounds and substances to use in it.

Have you ever tried cooking an egg on your HSF? Tasty.

You can also use somthing like WatterWetter to increase the heat transportation of the water.

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if you sprung a leak, the EPA would be all over you....

-DAvid

-Live, Learn, then build your own computer!-

Ha! Too late, I'm already insane (and I'd be surprised if my family weren't).

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Actually mercury would be a bad choice because it has a lower specific heat than water and would not be able to take in much of the heat produced by the processor. You need to find something that has a higher specific heat and a little less poisonous. Why not antifreeze? heh heh.

Do you work at UPS? 'cuz i could have sworn you were checkin out my package!

And apparently it doesn't conduct heat as well as straight water--at least, so I've been told.

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Hmmmph--whatever...

Water wetter is fine, but true antifreeze is corrosive and should be flushed out of car systems fairly frequently. It does prevent growth of nasty stuff, but so can other, non-corrosive substances. This is why generally car coolant systems should be drained in summer and replaced with a non-antifreeze solution generally. There are new products out now that do the same thing whilst being much less corrosive (I'm not talking sulphuric acid in any case) and they claim you do not need to flush them...

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yeah, but flaurinert is EXPENSIVE!
but flaurinert can be cooled with ln2 i think, and then used to cool the system.
also, you will have to replenish the ln2...
and unfortunately, unless you are generating enough heat to heat up the flaurinert after it is cooled down, i am pretty sure that it turns into a gel like substance when it gets too cold...
that would not be very good for the pump, or the cooling capabilities of the total system.
not sure tho.

-DAvid

-Live, Learn, then build your own computer!-

that would be a very high maintenance system.
imagine replacing the dry ice like once a day...
but it might cool the air good..
and cool air would make the heatsink cool better.
what i am thinking about is this.
a refrigeration system, that cools the air to a very low temp, but right before the air goes into the system, there is a dehumidifier, which dry's the air so that it will not be as likely to condense.
i dont know how good that would work, but it might cool the system down a bunch!
anyone else have an idea about this?

-DAvid

-Live, Learn, then build your own computer!-

yeah i do realize that it would be a high-upkeep system, but of course i was just posing the theory. It would cost a bunch to get a new block of dry ice each day. As for the problem of condensation, couldn't you keep the cold air in a metal pipe with sealed ends and just drop a chunk of dry ice in there every once in a while? There may be however a condensate that will form on the pipe itself. So i guess there really isnt a point to go through all the trouble of get a dehumidifier, more dry ice, etc.

Putting the laughter back in to Slaughter.

didnt the flaurinert turn to gel when they used the dry ice and the ln2?

-DAvid

-Live, Learn, then build your own computer!-

Why bother? Any CPU temp around 40C is plenty good.

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I was doing some research last night and i found a liquid that has a higher specific heat than water and it is naturally ocurring! its liquid ammonia! the only problem is that its a gas a room tempreture. I checked out household ammonia thinking it would work, but it says that it is ammonium hydroxide plus some weird additives. I asked my chem teacher about it and she said ammonium hydroxide is the product of running ammonia through water. Maybe itll work, maybe it wont... ill research some more.

Putting the laughter back in to Slaughter.

But ammonium hydroxide will attack certain metals, make sure you choose the right one(tube, waterblock, etc).

I have another idea, use some wool or similar things that can absorb moisture, put it on top of heatsink, a reservoir and a wool rope to supply water/moisture to wet the wool(the terminology for the effect please), and blow a fan to the heatsink/wool, heat is sinked through evaporation of water, which is highly effective.

i must say ed that is an ingenius idea! It takes a lot of energy to break the hydrogen bonds so it would thus make it cool better. I guess the only thing is how would you face your fan? you cannot blow the water vapor toward the motherboard because wouldn't it come in contact with the components and make them short out? Blowing it away from the components would work, but your case would have to be open to allow the vapor to go somewhere. It may work better in a closed system, like in a pipe or a tunnel. Great idea though.

Putting the laughter back in to Slaughter.

The problems with using ammonia are as follows:

1) It is a gas at room temp.

2) It is corrosive.

3) It is highly noxious (smells bad enough to knock you out).

The solution: Use a closed system under high pressure. Under higher pressure the boiling point increases. You'd want to get it up around 75C for a liquid cooled system or around 40-45C for an evaporation/condensation system.

Of course, it would still be highly corrosive, so you would have to replace parts occasionally (particularly in the pump if one is used). And if it ever springs a leak you would have to evacuate. I'm serious, this stuff is powerfully smelly, enough to knock you out and leave you breathing it in and corroding your lungs until you die.

As for the wet wool idea, there are 4 problems:

1) water + electricity = electric short

2) You would have to constantly be wetting the wool. High maintenance.

3) As the evaporation takes place, it increases the local humidity. As the humidity increases evaporation becomes less effective. You would have to exhaust the humid air from the computer room.

4) Moisture + warmth = mould and other biotics

As for the solution, you would have to use some sort of an open topped container to hold the wet wool only over the CPU. Since you would have to make sure that it does not leak, you would most likely have to permanently affix it to the processor/mobo, meaning no upgrades. There's a heat conducting enamel that you can paint directly on the CPU to waterproof it and the surrounding area.

They you set up some sort of a wick to move water from a reservoir to the wool. You would still have to fill the reservoir on occasion, but it's a lot easier than trying using an eyedropper to add a few drops every few seconds.

As for the circulation/humidity problem, simply open a window and have a fan exhaust the air.

The biotics problem is a bit more difficult. You can't add anything to the water because it will either a) evaporate with the water into the air that you are breathing or b) as the water evaporates and it doesn't it will build up over time and start "gumming up the works". Solution: don't use wool. Find a substance which is porous enough to absorb the water and is naturally resistant to biotics. Unfortunately, nothing comes to mind here.

Wouldn't it be easier to set up a watercooling system with a bong-type evaporator instead? Same general effect except that the evaporation is moved out of the case.


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