Quote:
Originally posted by chesspatzer
It's been a little while since I've used my engineering background but here's what I think really matters. Since you want to draw heat off of the CPU, a "convective heat transfer process", the basic formula is: Q=hA(dT), where Q is the rate of heat transfer (bigger is better), h and A are dependent on the block characteristics, and (dT) is delta T or temperature difference. The only thing that you can control by your setup is the delta T. The bigger the delta T, the better. Now, what is delta T? It is the temperature difference between the surface temperature of the CPU block and the water flowing across it. Specifically it is t(s) minus t(w) where t(s) is the temperature of the surface and t(w) is the temperature of the water. To make this number bigger, our goal, we can make the CPU hotter, not what we want, or make the water cooler!
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Not quite. Q=hA(dT). Heat output (Q) is constant - there's nothing you can do to the WC system to make the CPU put out more heat. hA is a function of the block, the water in it, and how they interact. You can improve hA by increasing flow rate and improving the WB design.
Thus dT is constant. Applying colder water will not change dT. It will decrease the CPU temperature to keep dT constant.
Same result - colder water temp is good.
Alchemy