Originally Posted by Just a nickname
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?
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