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How bad can elbows be? with 450 gph pump? - Page 2

post #11 of 25
Thread Starter 
Quote:
Originally Posted by x Swift x View Post
i think it is equivalent to about 1 1/2 Feet of tubing..

http://www.engineeringtoolbox.com/pv...ngs-d_801.html
Thanks, Sorry, to succinct, please, clog it up with some equations, thermodynamic, neutonian physics, somthing...

Really though, thanks for puting it in a nutshell.
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post #12 of 25
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Quote:
Originally Posted by Dryadsoul View Post
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.
Thanks, thats quite a hefty drop. I'm gonna guess though, that 90% of it is in the rad. After all, a rad has dozens of the equivelent of an elbow.
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post #13 of 25
Thread Starter 
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...
Interesting thought, hows your theroy go?

Quote:
Originally Posted by CyberDruid View Post
With 4 elbows in my loop and virtually no additional length of tubing I get terrible flow rate. Still sorting out the culprit...
How do you measure your flow rate?

Thanx for your reply, Croak
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post #14 of 25
Thread Starter 
Quote:
Originally Posted by Martinm210 View Post
... 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.
Not to mention your rad which I wouuld think is like a bunch of elbows.

Quote:
Originally Posted by Martinm210 View Post
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.
That would great, I'm sure I'm not the only one whos pondered this little mystery of life! Look forward to it.
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post #15 of 25
This from here - http://www.plumbingsupply.com/fittingflowchart.html
and also here - http://www.pondarama.com/html/friction_loss_charts.html

Quote:
using a 1/2" 90 degree elbow is approx. the same as 1 1/2' of pipe

Item .......... 1/2" .... 3/4" .... 1"
90 Elbow ... 1.5' ....... 2.0 ...... 2.5
45 Elbow
... 0.8' ....... 1.1 ...... 1.4
T - Branch .. 3.8' ....... 4.9 ...... 6.0
T - Run ....... 1.0' ....... 1.4 ...... 1.7
post #16 of 25
Thread Starter 
Quote:
Originally Posted by ira-k View Post
If you have to use any try to use plumbing sweeps instead ...
I'd considered making sweeps out of some poly-pro tubing and a heat gun. Are there any pre-made ones?

Quote:
Originally Posted by ira-k View Post
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....
I figured this out once came up with a "2.1" "..."2.1" what's, I cant recall, I think it was PSI? THe other part of the equation is "Himax 6.7" (printed next to the gph).

Can you tell I know blessed little about what I'm talking about?

Thanx
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post #17 of 25
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Quote:
Originally Posted by CrazyJoe View Post
Thats pretty sraight forward, I guess for me though, begs the question of what the value is for a 1.5' is and how it can fit into an equation for my loop.

Thanx, Croak
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post #18 of 25
I get excellent flow in my loop with a CPU / GPU / NB and a 360mm radiator. I get between 3-4 GPH.

I am using a Laing D5.

People put way to much concern into flow rate. The goal of watercooling is not to maintain the highest flow rate, but rather cool your components! So if you decide not to cool you GPU / NB because you don't want to restrict flow that is silly.

Flow rate minimally affects performance as long as you maintain a decent flow rate. The curve is going to look something like f(x) = ln(x) + e.
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post #19 of 25
Here's a little bit better chart to read ... plus, all you really need to do is move the decimal over two spots to get the measurement per foot instead of per 100 feet.

http://www.plumbingstore.com/flowchart.html

Then, have the approximate head/psi output of your pump, start adding up the elbows that will be in your loop along with the full length of your loop. You should be able to get an approximation from the chart.
post #20 of 25
Quote:
Originally Posted by Croak2 View Post
I'd considered making sweeps out of some poly-pro tubing and a heat gun. Are there any pre-made ones?



I figured this out once came up with a "2.1" "..."2.1" what's, I cant recall, I think it was PSI? THe other part of the equation is "Himax 6.7" (printed next to the gph).

Can you tell I know blessed little about what I'm talking about?

Thanx
Yeah you can find them at McMaster-Carr or a local plumbing supply house...2.1 was probably the ft or meter of head...

An average WC pump the D-5 or 18W DDC will give you around 1.5gpm flow in a low restriction loop....

....http://www.mcmaster.com/
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