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How bad can elbows be? with 450 gph pump?

post #1 of 25
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Hi,

Laying out my wc system , its kind of no holds bared mod (compact). It would be REALLY cool if I could put elbows on top of my cpu block & maybe my nb block.

Anybody got any hard data (I.E. equation) or some very good anecdotal evidence about the adverse affects of a few elbow in a wc setup. I've got a 450 gph pump.

The whole system . Den cpu block, TT nb block, Blk Ice extrem equiv. 6x5x1.6 rad, and hydor 450 gph. (push pull fan setup with shrouds (120 cfm each)


Croak

P.S. An other odd take, I wounde up with some 2 piece 90 elbows. Couldn't figure out why 2 parts. Opened them up and found they had a significant larger area in the knuckle. I wonder if this could hrlp offset the drawbacs of a basic 1 peice polypro elbow
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post #2 of 25
i think it is equivalent to about 1 1/2 Feet of tubing..

http://www.engineeringtoolbox.com/pv...ngs-d_801.html
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post #3 of 25
Keep in mind that the pumps flow rating of 450GPH is obtained with zero restrictions in the loop.

My Laing D5 is rated @ 317GPH = 5.23GPM, but with a rad and WB in the loop it averages only 1.75GPM.
  
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post #4 of 25
I would think that multiple restrictions add to a higher total restriction than each individual restriction on it's own...

With 4 elbows in my loop and virtually no additional length of tubing I get terrible flow rate. Still sorting out the culprit...
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post #5 of 25
I'm planning to do a test with elbows and some other fittings this weekend. I think they do add up in restriction, but I still think it's probably not anywhere near the restrictions we get from the water blocks.

If pressure drop reduces with flow rate on the water blocks, I think a similar thing occurs with the elbows/fittings. I also only get 1.6gpm with my D5 loop with two MCR320, D-tek Fuzion, MCW60, and T line.

I'll try to post some flow numbers with vs. without and I might also try to see if I can match that 1.5' of tubing theoretical or see what it really is at our lower flow rates that we have in a PC loop.
    
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post #6 of 25
If you have to use any try to use plumbing sweeps instead of the 90's they would be a lot less restrictive...I've always heard that each 90 is about like an extra foot of tubing...

Like Dryad said that 450 is at free-flow what is the head on that pump? That will give you a better idea of what actual loop flow will be....
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post #7 of 25
Quote:
Originally Posted by CyberDruid View Post
I would think that multiple restrictions add to a higher total restriction than each individual restriction on it's own...

With 4 elbows in my loop and virtually no additional length of tubing I get terrible flow rate. Still sorting out the culprit...
I doubt they add up in restriction. What I think you are seeing is the performance curve of head vs flow. Remember that as you increase restriction, flowrate drops more than before. The flowrate chart is curved!

Let's say an elbow adds 1ft of restriction. Adding one elbow drops your flowrate by 1GPH. Adding a second drops it by 2.5GPH. The increase drop is caused by pump design.
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post #8 of 25
Why not create a curved bend rather than an elbow
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post #9 of 25
Quote:
Originally Posted by Ace of Spades View Post
Why not create a curved bend rather than an elbow
If it is that curved, you usually don't need an elbow. You can just bend the tubing (usually).
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post #10 of 25
Quote:
Originally Posted by Ace of Spades View Post
Why not create a curved bend rather than an elbow
Plumbing sweeps....
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