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Question about using Y-fittings

post #1 of 8
Thread Starter 
So I am slowly getting stuff together for my loop (currently have a RX240, RX480, and 2 35x pump) and I am just pondering ideas of how I want to route the tubing and what kind of res's I want to use. I am thinking of using 2 frozenq 250mm res's and sticking a y-fitting connecting the 2 and sending em to the pumps, from the pumps>480>240>gpu 2>gpu 1>cpu and then from there back to another y back into the res's. I know the 2 res's would be overkill but it fits my desired look I am going for with my build.

So I am looking to cool 2 oced gtx 470s (possibly a 3rd at a later date) and an oced i7. MB cooling will also come at a later date.

Would the y's cause any flow differences? Only thing I would think of would it would be flowing differently thru the 2 res's but that would not cause that much of a difference would it?




P.S. Little drunk
Edited by TonkaEE - 3/26/11 at 3:41am
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post #2 of 8
And then you would reconnect the flow of the two pumps?

I really don't think you will see any performance gains from this.


Edit:
Drunk typing, it's so clear now xD
    
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post #3 of 8
Just to be sure I am reading it right you want to use 2 res's with a Y fitting splitting the loop for input, and a Y fitting connecting them back together again?

That being the case, what will happen is that the flow rate will be cut in half leading away from Y1 and combined post Y2, with the resultant flow being low inside the res's, assuming equal tubing lengths. To compute the flow rate impact if you know what the res's resistance will be, calculate your flow in the same way that having parallel resistances in an electrical circuit. The impact to total system flow will be nominal, as far as the fittings themselves, so marginal it would be difficult to measure.

So 1/Rtotal = 1/R1 + 1/R2

Total resistance in this setup will have a lower resistance to flow impact than having just one res in serial. However, that said, you will increase the volume of the water to be pumped increasing distance which could impact the flow rate negatively.

If a setup like this would benefit you, I don't see why not, assuming you have the tubing and space to route it correctly. Hope this helps!
 
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post #4 of 8
Thread Starter 
Basically right now I would be running 1 loop with both res's connected together at 1 both end input and output. Heres a quick sketch in paint I was looking at, made it a little big so just linked it.

http://i624.photobucket.com/albums/t...g?t=1301138229
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post #5 of 8
Quote:
Originally Posted by TonkaEE View Post
Basically right now I would be running 1 loop with both res's connected together at 1 both end input and output. Heres a quick sketch in paint I was looking at, made it a little big so just linked it.

http://i624.photobucket.com/albums/t...g?t=1301138229
At work websensed sadly, could you post the image as an attachment in this forum?
 
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post #6 of 8
I dont see a problem with the "Y" in and out of 2 res go for it.

As for radiator capacity you got enough planned and future proofed.
    
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post #7 of 8
No point in having 2 reservoirs if you are going to have just one pump. The set up you have has no benefits. Using a y connector decreases flow in your loop
Res-pump-rad-cpu-rad-gpu is how is should go for example..
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post #8 of 8
Martin had a post around here somewhere testing the effects of a whay/Y fitting and while it is restrictive, in the sense that when compared to straight tubing which could be said to offer nearly no resistance to flow, that the effect of the fitting was nearly negligible. In that sense there is no "something for nothing", however, just like in a circuit design, it is simply false to assume that 2 resistances in series, using equal resistances in parallel, is less restrictive than the parallel circuit.

5 ohm + 5 ohm = 10 ohm cumulative resistance

5 ohm + 5 ohm (in parallel) = 2.5 ohm cumulative resistance

While the flow within the parallel portion of the circuit (loop) will be lower (as the applied force) is being split, the flow of the entire loop is computed using total resistances as they relate to pumping power. Thus the parallel portion is computed separately than added as a resistance as if it were in serial.

Thus, if flow is not an issue within the parallel portion of the loop, then it could be said that concerning total loop performance it is always better to parallel than to serial devices not flow dependent as it relates to performance.

As far as what this will do for you in loop performance, I suspect increase the time before the system reaches thermal efficiency as it relates to cooling in the current conditions the system is in... ie. instead of 10 minutes to "warm up the loop" to OAT to radiator temp (wattage) dissipation (rad size, oat temp, fan speed efficiencies determine this), it may take 15 minutes. Due to increased fluid mass and its ability to absorb caloric energy.
 
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