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Originally posted by Can O' Beans
I can't see how a rad/HC can get worse results with higher flow (not including pump heat).
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Actually it gets better results. But the higher the flow, the lower the increase in efficiency. (am i clear on that one ? it's rather difficult to explain with words)
So if you're already on the 'flat part' of the efficiency curve (ie already decent flow), doubling the flow will only increase rad efficiency by a few %. That means the rad MUST be already able to handle the increased heat produced by the more powerful pump...
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Yes, the water isn't cooled down as much per volumetric unit, BUT the water as a whole is now moving a lot quicker thru the rad - more heat removal overall for the system.
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Exactly, what must be considered is the total volume of water cooled down each second, and not heat per volumetric unit.
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One of the main things is to try to remove most of the pump heat before it can even get into the water.
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Unfortunately that implies active cooling = noise. Or manage to place the pump in the path of the heatercore exhaust...