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What if the flow is so high, that the temp at the outlet of the rad is not much different than when the coolant went in?
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Performance would be uneffected most likely. It doesn't matter if the water is at .99999c or 10 MPH, theres always the same amount of coolant in the radiator. As long as you can keep throwing more heat into the rad, it shouldn't matter how fast the coolant moves or how long the coolant stays in.
This is because every H20 molecule is the same.
It doesn't matter if one warm mole spends 10 seconds, or two equally warm ones get 5 seconds each, either way the same amount of heat passes out of the system.
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But if the outlet temp is just as high, what's the point?
What if the flow was so low, that the coolant temp would go very high, enter the rad, have plenty of time to cool down, and exit at a temp slightly above ambiant?
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Bot these situations should transfer just as much heat. Remember all that matters is hoiw much heat leaves the system, not which indivdual water molecules carried it. Either way the Delta T across the radiator will be the same, so both perform the same.
I agree, the idea that high coolant velocity somehow hurts effciency makes no logical sense. How ever parallel rads make sense because they diminish flow resistance somewhat, thus allowing for better flow to the waterblock.