Quote:
Originally posted by airspirit
Slap me if I'm wrong, but I seem to remember that running a centrifugal pump, it is a lot more efficient to push than to pull. With the res before the pump there is no resistance to water being sucked into the pump ... that is the nature of the res. With the res after the pump, turbulence is created in the res causing a dramatic loss of pressure. If you thought your 2x90deg bends were bad, that's nothing compared to what you introduced by putting your res where it is. You need to turn your pump around and have it pump the other way. You can blow all the air you want over that radiator, but it won't make up for the dramatic drop in flow rate through the entire system. Swap flow direction, and be amazed when your temps drop by 6-9C (estimated). That isn't a theory, that is based in solid mechanics. If you flip it, good temps will come.
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Interesting...
I was about to flame you for writing that, then I read it again, and I agree. The centrifugal pump is pretty lousy at pulling (sucking) water, that's why it needs to be primed. All they really do, is throw water around. I think that keeping a pump at the bottom of the loop is best, and that's what most of us do, but on the other hand, in a closed loop (which this is not), I have a hard time believing that it matters at all.
I agree that this splashing around in the res does not really serve any purpose, except for aesthetic (it looks cool). It is however restrictive, to a certain extent. Reversing the flow should fix that. Good call.
Alternatively, you could take that copper tube, and cut it in half along the length (leave a small ring to attach it), and leave the opening pointed towards the res outlet.