Originally Posted by strap624;12304690
Thats pretty interesting. But why doesn't the fluid heat up? I'm not understanding how it is cooling so well. With a bare processor isn't the efficiency pretty bad?
Originally Posted by cubanresourceful;12304614
Wouldn't it be better to have a high boiling point?
Lower the boiling point the better I'd think.
A cooler's job is take energy (in the form of heat) away from the CPU. This system does that by transmitting energy to the liquid which causes it to change it's phase from liquid to gas(that's why there are bubble). That process needs heat, so it gets it from the CPU, thus the CPU cools down a little bit. Gas is less dense than liquid so the bubbles rise up to the metal area which is being cooled by that fan. When it hits the cooler metal it condenses again, a process which gives off energy(in this case to the metal). Then the liquid drops back into the reservoir and the process happens continuously.
The lower boiling point is good here because the process of evaporating the liquid can occur at a much lower temperature. If the BP was higher, let's say it was water, the CPU would have to get to around 100C before the liquid could cool it.
And as for the bare proc, the reason we use heat sinks is because air is a pretty poor conductor, so in order to move heat from the CPU, we need to pull it away and then dissipate it, or the CPU would overheat since air won't pull the energy from it fast enough. In this case however, a heat sink would be disadvantageous because the medium that's cooling the CPU is the actual liquid, so just as with a CPU block where you want maximum metal to metal contact, in this case you want maximum liquid to metal contact.
I could see this having really useful applications for things like laptops which are already sealed off by design. Phase transition is the most efficient cooling method I know of, so if they could use this liquid in a similar fashion, they could really beef up the GFX cards in laptops.Edited by B-80 - 2/7/11 at 10:37pm