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post #41 of 46
Using the mini fridge in addition to radiators is an equally bad idea. it will net you roughly the same temperatures as in that case the radiators will warm the fluid after it has been through the fridge. The question has veen asked before. A refrigerator (or freezer) is not capable of cooling a heat load.
    
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post #42 of 46
Quote:
Originally Posted by Sir Diesel View Post

Yes, very similar! but instead of having a three way, use one, two or three heat exchanges on a separate loop. when the extra cooling is not needed, the pump just doesn't run.



I think as previously (historically) stated, a mini frig can't be run as a stand alone solution, but "might" be used as a cool booster.

Does that make sense?

P.S. The orange loop is the Mini Frig loop that has a separate res. and pump.

This proposed system also will not work (or, rather - it will, but will net you nothing more than stress on your mini fridge)

Here's why:
1.) Refrigeration and heat exchange isn't instant: it will take more than the few seconds any water will be inside the mini fridge to make a difference.
2.) Radiators are nothing more than a heat exchange. In the physical world, all things work at varying degrees to achieve equilibrium with one another. For example, if two tubs of water are filled to separate levels, and connected with a narrow tube at the base, the two tubs will reach the same level of liquid. Similarly, if two objects that touch are different temperatures, one will get warmer and the other cooler until they are the same temperature, and finally are cooled to the same temperature as the surrounding atmosphere. Given this, your radiators will be working to bring the water back to room temperature, and the mini fridge will be working for zero change in temperature.
    
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post #43 of 46
Quote:
Originally Posted by Just a nickname View Post

If you want a nice watercooling project, add some dry ice into your reservoir. The best would be to have a huge reservoir, you cool it off with the dry ice. If you want the temperature to go sub-zero, simply add some glycol.

Freezing point vs %:
http://www.engineeringtoolbox.com/propylene-glycol-d_363.html

Adding glycol will reduce the capacity of the coolant to absorb the heat. At 60% of glycol you lose about 20% of performance but you can go as low as -60C... Dice sublimates at -78C so that's pretty good for a watercooling set-up.
The only problem is that glycol is much more viscous ( might be a pump issue) than water and PVC don't resist very well to low temperature. pvc temperature range is -15f tygon pvc is -35f. Bellow that I expect the pvc might become rigid and eventually fissure.

You wouldn't need the glycol, so long as you design your tank properly.

Since the dice would be in a tank, any water freezing would be around the dice, in the tank. Since any ice formed would be stuck in the tank, until it melts, it couldn't clog your loop. The only concern would be if ice formed a boundary layer around the dice, but that wouldn't be an issue, as it would melt eventually, meanwhile giving a fair amount of cooling. You'd need something to agitate the tank though.
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post #44 of 46
Quote:
Originally Posted by ZytheEKS View Post

You wouldn't need the glycol, so long as you design your tank properly.

Since the dice would be in a tank, any water freezing would be around the dice, in the tank. Since any ice formed would be stuck in the tank, until it melts, it couldn't clog your loop. The only concern would be if ice formed a boundary layer around the dice, but that wouldn't be an issue, as it would melt eventually, meanwhile giving a fair amount of cooling. You'd need something to agitate the tank though.

The only problem is that the water temperature won't go bellow its freezing point (like any liquids). If you stir it, the whole liquid body will have to hit the freezing point to begin to freeze. This is why you must add glycol to get lower than zero temperature.

If you don't stir the water/liquid, the molecules will indeed freeze around the dice because this is there the molecules have the least energy. Either way, the dice produces gas that agitate the water so you don't even need to stir it. The liquid will basically loses heat until it hit the freezing point and start freezing.
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post #45 of 46
Quote:
Originally Posted by Just a nickname View Post

The only problem is that the water temperature won't go bellow its freezing point (like any liquids). If you stir it, the whole liquid body will have to hit the freezing point to begin to freeze. This is why you must add glycol to get lower than zero temperature.

If you don't stir the water/liquid, the molecules will indeed freeze around the dice because this is there the molecules have the least energy. Either way, the dice produces gas that agitate the water so you don't even need to stir it. The liquid will basically loses heat until it hit the freezing point and start freezing.

If you go below 0c the glycol get's too viscous for the small pumps we use in computer liquid cooling, and you will very likely burn your pump out. Beyond that, I doubt the difference in temp will be that much. Remember, if someones using this powerful of a cooling method they obviously are pushing a pretty powerful overclock. An FX8350 at 5GHz is around a 230watt heatload. We're talking the difference between a 50celcius dTemp and a 60celcius dTemp, which is NOT that much of a difference. You probably wouldn't be able to push much more of an overclock between those two.

The only reason to use glycol in a computer loop for antifreeze purposes is if you have a TEC chiller, or a phase chang chiller. With a chiller, the danger isn't the loop dropping below freezing, it's that the TEC or evap can "Frost" creating an insulating layer of ice over the TEC.

For use in a DIce chiller the glycol solves a problem that wasn't there, while adding it's own problems. Then again, how did we go from cooling rads in a mini fridge to talking about a dry ice chiller build? tongue.gif

On a side note, you WOULD need something to agitate the chamber other than just the sublimation. Go to the store, grab some Dice, and drop a couple chunks in a bucket of water, then wait for the bubbles to stop. Fish out the chunks of ice at the bottom, crack them in half, then throw them back up, bubbles will form again. Water can still freeze over the dice.
Edited by ZytheEKS - 10/27/13 at 5:40pm
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post #46 of 46
It's more like I'm just thinking aloud.
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