I'm glad that we're having this debate. I've always felt that the low flow rate theory needed to be challenged. (even if it's been done before)
So far, I think we all agree that there is a minimum flow rate for a rad, for it to operate efficiently. If the flow is completely stopped, then there is no heat dissipated.
I also think(hope?) that most of us now believe that a higher flow rate, beyond the minimum, will have no/little significant impact.
I would certainly hope that more of us see that the highest flow rate would create an increasing amount of turbulence, thereby increasing the rad efficiency. On the other hand, that turbulence just might be that sweet spot, and the higher flow rate would do nothing. I think this is why every rad behaves differently. This turbulence will depend A LOT on the internal design.
As for the graphs seen on the OC article (link above), I was thinking about it last night, and it seems that the curves don't have enough points to come to any kind of conclusion, and that the curve drawn is extrapolated (Excel?) and could be way off.
Testing the two rads parallel versus series:
We need a volunteer!
Anyone?
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