Quote:
Originally posted by superart
good point, good point, but look at it this way.
In a rad, the deltaT is not very large, in relation to the deltaT of a cooler or instance, so the flow rate of water really doesn't make much of a difference since high flow or low flow, the efficiency will be more or less the same. The reason you would want high flow on a rad setup is because it is better for your specific block, since some blocks perform better with higher flow.
In a cooler, however, the deltaT is much greater, therefore the more "time" the water spends in contact with the cooler, the longer it will be exposed to the "greater deltaT", the more efficient and effective the cooler will be. Because of this lower flow rate, you would probably want to pair the setup up with a block that performs better at lower flow rates.
Am i thinking along the right track?
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I'd argue with a couple of things:
"some blocks perform better with higher flow" is false. All blocks perform better with higher flow, all other things remaining constant. (this is refering to cpu blocks, of course).
And remaining in the chiller for longer results in lowered efficiency, as delta T drops as more time is spent in chiller. Now, that said, if one imagines a loop with no heat source, and only a chiller block, slow flow through the chiller will deliver really cold water faster to the cpu block (assuming it is right after the chiller) than high flow, but high flow will chill ALL the water faster. At least, i think so.
I just dont see how lower flow can help - if X watts of heat can be removed from the water via the chiller per delta T per second, then maximizing the delta T maximizes efficiency. This is how water cooling works! Feel free to explain the wrongheadedness in this, because from a mathematical/heat transfer perspective, i simply dont see it.
Feel free to get as technical as you want, i am familiar with PDE and the general heat transfer equations.