Re: the slowing water in the radiator so it spends more time myth
Speed is distance over time. Flow rate is volume over time. The speed of flow may vary throughout the loop, but the flow rate is constant. Regardless of how fast or slow the water is moving, the same amount of water passes through the radiator in a given time. The correct way to increase the time the water spends in the radiator is to make the radiator bigger, increasing the distance and giving the water a longer trip through the radiator rather than a slower one.
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