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Originally Posted by lolito_fr
Assuming that, isn't Qactual=Qmax? (neglecting secondary losses, as usual)
In which case, based on (1), (2) and (3) we end up with Tout=Tdie ???
(must admit to not having spent much time on the article, so perhaps this reader is also an idiot)
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I think you are right if you take that approach. Meaning that Effectiveness is always 1.00!?
Unless die temp is fixed (a thermally superconducting block of infinite mass) and thus able to deliver whatever Q is defined by R and Tin...
It's annoying me.
The conclusion I draw is that Waterblocks are more effective at lower flowrates, despite the fact that their thermal resistance is better at higher flowrates... !!?
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A high effectiveness cold plate has a high liquid exit temperature and requires less flow rate for the same required thermal resistance. As a result, the liquid pumping power is reduced and the size of the radiator can be much smaller.)
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Perhaps sums up his approach. I believe exit temperature is a consequence of flowrate and heat transferred, not cold plate effectiveness. But to maintain a given die temperature, the flowrate can be reduced with a lower resistance waterblock.
And one thing he is spot on with, is that the radiator can be much smaller with this approach. That might actually be the point...
<a sudden glint of understanding>
...I'll have to think some more, this might actually be a rather large point....