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The impact of tubing sizes by Cathar - Page 2

post #11 of 14
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Quote:
Originally Posted by Apollo4g View Post
hmmm anyone want to trade a 655 for a petra's top and Laing DDC with Petra'sTech DDCT-01s Top?
LoL with all those blocks i have, im thinking i will need the head now.
or do you think the 655 will do?
Check this out

Quote:
Originally Posted by MetalZone
Cathar, with pumps that have less head pressure than the DDC1+/DDC2 like the D5 or perhaps something even weaker, how much of an impact would tubing size bring upon flow rates and temperatures?
Quote:
Originally Posted by Cathar View Post
The more restrictive the setup, the more that the setup benefits from a more powerful pump to keep flow-rates up. We're still talking about being slightly more powerful, not massively so. Let's run some figures with a DDC1. It's weaker than the DDC2, so I predict that it'll fall behind the DDC2 a bit for the more restrictive tubing sizes, but close the gap as the tubing opens up. Let's see how it goes eh?

Well, here's the graph of the curves against an unmodified DDC1, which is the other pump I suggested would closely match the simulator's pump prediction. A fair deal weaker pump than the DDC2. Pressure head is in the ballpark of the D5. I don't have the PQ graph for the DDC1 with a modified top, so I'll run with the stock DDC PQ graph. It'll be interesting.



Pump heat dump is 8.5W (measured by me in the past).

The intersections all are:

6.35mm quick fit = 3.9LPM flow, 0.0812 block c/w, 0.0378 rad c/w
8mm barbed = 4.2LPM, 0.0805 block c/w, 0.0376 rad c/w
8mm quick fit = 4.95LPM, 0.0782 block c/w, 0.0372 rad c/w
9.6mm barbed = 5.0LPM, 0.0781 block c/w, 0.0372 rad c/w
9.6mm quick fit = 5.4LPM, 0.0774 block c/w, 0.0370 rad c/w
11.1mm barbed = 5.55LPM, 0.0771 block c/w, 0.0369 rad c/w
12.7mm barbed = 5.6LPM, 0.0770 block c/w, 0.0369 rad c/w

Final CPU temperature is ambient (22C) + system load (108.5W) * radiator C/W + CPU Load (100W) * block C/W

6.35mm quick fit = 34.22C
8mm barbed = 34.13C
8mm quick fit = 33.86C
9.6mm barbed = 33.85C
9.6mm quick fit = 33.75C
11.1mm barbed = 33.71C
12.7mm barbed = 33.70C

...or tripling the block C/W

6.35mm quick fit = 50.46C
8mm barbed = 50.23C
8mm quick fit = 49.50C
9.6mm barbed = 49.47C
9.6mm quick fit = 49.23C
11.1mm barbed = 49.13C
12.7mm barbed = 49.10C

As you can see, the results are very close to the DDC2. With a modified top, I reckon that the DDC1 would be about equal to the DDC2.

The Laing D5 has about the same pressure as the DDC1, but dumps a fair amount more heat into the loop since the D5 is a more highly flowing pump, but that high flowing nature is wasted with a moderately restrictive setup with a Apogee GTX, and so it'll just dump more heat. Without calculating, a top-of-my-head guess is that you'd see results similar to the DDC1, but add on about +0.25C across the board due to the extra pump heat.
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post #12 of 14
Quote:
Originally Posted by ira-k View Post
Martin it might be because the 18W DDC has a lot higher head then the D-5 so even with the smaller tubing ID's it was still getting good flow...They really work well in high restriction loop...I get over 20' of head and 3gpm actual loop flow with mine run in series I like high head and high flow loops...

That's true, it would have been different with a D5, high head would make the difference much less.
    
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post #13 of 14
Quote:
The Laing D5 has about the same pressure as the DDC1, but dumps a fair amount more heat into the loop since the D5 is a more highly flowing pump, but that high flowing nature is wasted with a moderately restrictive setup with a Apogee GTX, and so it'll just dump more heat. Without calculating, a top-of-my-head guess is that you'd see results similar to the DDC1, but add on about +0.25C across the board due to the extra pump heat.
OH NOES! My temps must be so much worse because of my pump!!!!! 0.25C, that's enough to break my mothership!

[/end sarcasm]

Yeah. . . Doesn't look like tubing size really makes a difference if the rest of your setup is decent.
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post #14 of 14
So what can we conclude? For "serious" watercoolers [The ones who use 1/2" or 7/16" ID), the differences between 7/16 and 1/2" tubing is very small.

What could I think would affect the results? If one were to add, say, a MCW30 chipset block and any GPU block, be it full cover or not, I would think that the differences would be more spread apart. Now, by how much? I leave that up to testing
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