Informal test results CPU 350 vs Apogee GTZ

[gzipper]

Been uber busy all week working on major project, and I am shocked to see this thread reached 7 pages already.

Still working hard, and too busy to respond individually, it would take hours! Here is some additional info.

Stephen told me that he ran the chiller pump on full because he noticed how restrictive the 350 was, and he wanted to keep his measurements out of the asymptotic area of the curve (0-0.5 GPM - see for example http://www.swiftech.com/assets/image...e-TR_VS_FR.PNG). He likes to take his temp measurements in the "flat" area.

For comparative testing, it is not practical to try to reproduce a user environment with the chiller, because the PQ curve of our pump is too different from that of commonly used pumps (655, 350's etc). Knowing that we need to eliminate the single biggest variable by keeping the coolant temp constant, one needs to understand that if we wanted to mimic a user setup fairly in a comparative test, we'd have to measure the flow with an arbitrarily chosen loop setup, then disassemble the block, and match the flow on the chiller, then do that again for another block, then adjust the chiller pump again, etc.. it's simply too time consuming.

But if you got the pressure drop over the block you could match that with the formula:
dP=rkQ^2 => k=dP/(rQ^2) ,(k=l/2) r=density of water Q=flow.
you could plot that into a PQ chart of a "regular" pump and figure out the flow through it (without tubes and tubes have low k). K is the same with any pump assuming non-laminar flow.
Then alot of these discussions wouldnt be necessary.

The testing by itself is very good.