As cahillr said:
Quote:
Originally posted by cahillr
With the swiftech waterblocks you'd be much better off sticking with serial for the blocks than going parralel, they have pretty low flow resistance and it would help greatly in keeping your flowrates up.
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[The following is cut and pasted from an earlier post of mine.]
Here's a graphs showing some pressure drop vs flowrate curves.
The 'Sim' curves, are graphs of equations that approximate the PQ curves of Iwaki MD20-R and MD20-RZ pumps.
The other four curves show hypothetical cooling loops consisting of a 2-342 heatercore, (single pass, low restriction) 6 feet of 1/2" ID tubing (resistance of the tubing is based on one continous straight piece) and one of the following:
2 White Waters in series
2 White Waters in parallel
2 MCW-5000's in series
2 MCW-5000's in parallel
No attempt is made to account for the added flow resistance of 'tees' or 'wyes' required for a parallel setup.
Two White Waters in parallel have about the same curve as two MCW-5000's in series, so the two curves nearly overlap.
For the Sim20-R, per block flowrate is:
WWS 7
WWP 6.15
MCWS 12.3
MCWP 8.75
For the Sim20-RZ, per block flowrate is:
WWS 8
WWP 5.4
MCWS 10.8
MCWP 6
In all of these cases, series blocks always yields better flowrates through each block. In the high pressure pump case, (similar to cheap pumps in series?) the flowrate advantage of putting the blocks in series is even greater.
Keep in mind that these numbers don't include the flowrate hit for 'wyes' in the parallel cases. Variations in flow resistance in the tubing is not accounted for either.
Looking at the C/W vs flowrate curves for the blocks, it appears that the gain in flowrate would frequently offset the higher water temperature seen by the second block in a series setup. The first block in the series combination would always gain performance from the higher flowrate of course.
References:
Bill Adams' White Water test data.
Bill Adams' MCW-5000 test data.