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Originally Posted by Ares
essentially your using a venturi design where flowing water at lower pressure sucks water from the resevior with it. pulled through by the 2nd pump, and shot through multiple radiators.
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Ares, if both pumps were pulling from just the resevoir as initially presented, wouldn't any pump suction already be split among the resevoir inlets?
I'd think the mixing of the waters in a resevoir would be ok unless the resevoir was very large or the inlets were placed very poorly in relation to the outlets. If you think about the flow scenario, basically there'd be 2 pumps putting essentially 3 times the usual flow through the resevoir, so the resevoir will be nicely turbulent unless it is quite a bit larger than what seems typical.
As to comments by others, I'd think the water moving through the radiators twice as fast as the cooling loop shouldn't really make much of a difference, though. The radiator will basically shed just as much heat as delta-temp and airflow will let it, so I'd think little gain unless the radiator was already overkill for the setup, then running twice the flow through the radiator as the cooling loop would at best be less than running two radiators in series.
And here's a musing for all those who love to say that delta-tempature between coolant and ambient makes radiators more efficient, I don't see how that's possible. Here's a thought experiement of why: for a constant airflow through the radiator, a constant flow rate, and a constant ambient tempature, graph your radiator input tempatures x more than ambient, and output tempatures y more than ambient. Wouldn't (x-y)/x be the real measure of efficiency? So for the premise to be correct as x increases y approaches x, so a little postage stamp radiator could cool infinitely super-heated water to ambient in one pass.
I would suppose the best-case scenario is then that the radiator will reach a point of load where it sheds a constant (x-y), which would mean it's all about the ability of the air to remove heat from the radiator. So essentially all water cooling accomplishes is moving the heat from the cooling blocks to a big heatsink (the radiator).