Leave the antifreeze in. If you somehow accidently get the computer going without any load (e.g. you put a HSF on the CPU to test it or something), the liquid WILL freeze, even with the TEC's at 1/4 power.
The new heatsinks will do nothing to help. That's my prediction. The problem is not that the heatsink is inefficient, it is that the heatsink is not capable of dissipating the heat at the temperatures that you want this system to run at.
Here is an analogy.
A vertical mineshaft is dug 100m up the side of a mountain. 50m down the side of the mountain there is a small lake, 25m deep. The lake is drained by small cracks and tunnels in the rock to the sea, 50m below the level of the lake.
Everyone is happy until the mineshaft starts filling up with water from an underground spring. It ends up totally flooded. (the computer is turned on without any heatsink) It fills up with water (temperature rises) until the pressure increases so much that the water forces itself through cracks in the rock to the sea. The level stops rising (temperature has stablised via secondary losses) but the mine is unusable (dead cpu) so it is filled with big rocks and closed.
The miners are pretty clever, they decide to try again, dig a new mine but this time they drill a drainage pipe (A heatsink is installed) through the rock to the sea (ambient air). It is a pretty narrow hole because they don't have any wide drills which will reach that far. (its a pretty crappy heatsink)
The underground spring starts flooding the new mine, leaving the old one to stagnate but the drainage pipe holds the water level to a usable level, but they need better, the vein of gold they are mining goes deeper.
They come up with the idea of drilling a much bigger but shorter hole (installing a waterblock) and draining the water (heat energy) from the mine (CPU) to the lake (Liquid coolant), which is closer than the sea. They also drill a tunnel from the lake to the sea (a radiator), but environmentalists living on the beach protest and force them to accept a limit on the size of the drainage pipe. However, despite the problems this seems to work well, the water level is kept low because the wide drainage pipe takes the water away as fast as it enters the mine. And so they dig. All is well.
A travelling salesman comes by, selling waterpumps. (TECs) "A great invention" he says, "with this pump you can pump the water out of your mineshaft to a depth of 76m, more gold for everyone" and proceeds to demonstrate by pumping the old, rock filled mine dry in a matter of minutes. "it runs on waterpower, really cheap to run"
"Great" everyone says, "lets do it, but rather than pumping the mine directly we'll pump out the lake, then the water level will be lower and we'll be able to drain the deeper mine into the lower lake level."
And so they did, they diverted a mountain river to power the water wheel driven pump, calculating that the extra water entering the lake would be offset by the increase in drainage capacity given by the pump...
But the environmentalists would not let them enlarge their lake drainage. The extra water added by the pump backed up and the backpressure caused by the too narrow outlet pipe made the slow moving waterwheel stall, the lake filled up, the the mine drainage failed and the mine filled up to a higher level than when they had the narrow pipe to the sea.
"Oh" said the salesman, "it shouldn't do that. Try this smaller, more efficient pump"
"Try adding more water wheels" said a passing engineer "OK" said the miners and they did.
The pump pumped furiously, the water wheels churned and the lake level reduced a small amount but not lower than where they had started.
A passing mass murderer killed the environmentalists on the beach, they drilled a bigger drainage tunnel (bigger radiator), added extra pumps, (TECs) added more water wheels (TECs got full power), and the mine was able to be dug deeper than ever before, even below the sea level.
Unfortunately the miners went broke.
Cheers
Incoherent
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