Quote:
Originally posted by 8-Ball
By efficiency, I mean C/W.
I guess what I'm asking is can you produce a C/W vs flow chart for each stage in the transfer of heat from the cpu to the air, then sum these to determine an overall C/W vs flow for the entire loop, including all of the waterblocks.
Factor in the variation in heat load for different flow rates and try and predict the sweet spot for the system.
Or have I just ridiculously oversimplified what people are trying to do in the thermal simulator forum.
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You got it right. Last I heard, that's exactly what's supposed to be going on in the simulator. Except I don't think the variation in heat load will be considered, since it's hard to say with inline pumps how much heat is going into the water. And if you just consider the energy input to the water by pressure increase you get . . .
Hm. 1.5 gpm for an overall pressure drop of 5 psi (~10ft H2O) gives you an energy increase in the water of 3 W. So, maybe 5% of the CPU load.
If you have flowrate constant, flow resistances add up just like resistances in an electrical circuit.
[Edit - removed non sequitir. Thanks, Since87.]
And to nitpick on what someone else said, centrifugal pumps *are* analagous to voltage sources. But they are not analagous to *ideal* voltage sources. They induce a potential in the fluid (pressure), but that potential is a function of flow rate. I've only studied basic circuits so I don't know if there are any voltage sources that act this way. But it's still a decent analogy, in my opinion.
Alchemy