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Originally Posted by heatwave
Lporc - i'm not so sure how you would connect the radiators in parallel? 
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I suppose given your equations a monster head pump the difference in m is more affected by the split in flow than by the restriction of the radiators, thus making it a more meaningful drop than delta-T in the second radiator. Parallel would be .5m * delta-t * 2, serial would be m * delta-t + m * delta-delta-t.
However, that's just the math. Math is perfection, here in reality things get a little messier. I think the math shows us the best we can hope for, however we work with what we have got. Take this
article, on the Thermochill radiators. It has been observed that the dissipation of heat is not affected much by the flow rate of the water above a low point, but rather by the flow rate of the air. I think this might be a case where we have to move enough air to hit the full transfer value in your equations. But you are talking about passive...
Based on that, I would expect m to not be much of a factor so long as the split flows were not dropped to too low of a flow rate. That leaves delta-t as the big driver, and parallel would be better. Heck, with a few Y splitters and an extra length of tube you could try it both ways. I won't be satisfied myself until I have run a setup serial and parallel and compared the water tempatures at equilibrium. Right now I just don't happen to have two identical radiators and a monster-head pump. The pump is on order, tho
