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2x Radiators ~Air~ flow in series?

post #1 of 32
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Planning a gaming and Sketchup/Vray workstation at the moment and I took some inspiration from the Mac Pro 2013. To ensure adequate water-cooling in the form factor I desire, I was thinking about stacking 2x 60mm thick 120mm rads in a push/Pull-Push/pull configuration.

I am wondering how this would affect the cooling efficiency of the top rad. I am sure it would have a negative affect but assume not so much that it would totally negate the cooling of the top rad. Could the tube routing mitigate any negative effects. ie. Have the flow go from the bottom rad to the top, so that the water is cooled somewhat before entering the top rad, thus negating the fact that the top rad is getting warmer air from the first rad.


Edited by Calibos - 3/6/14 at 4:31am
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post #2 of 32
They water is going to equalize in your loop to about 2-3 C after some time anyways so it's a moot point where the water goes first. You can do this, you will want very high RPM with high static pressure fans to get adequate cooling. Also the difference between thick rads and thin rads is pretty marginal. If you can do a Push pull setup on the two connected and forget the thickness you will get better temps.
post #3 of 32
Generally, the target flow of a loop is about 1.5 gpm or 5.6 lpm so the water is shooting through the pipes fast enough that you wont have any hot or cold spots. Assuming you're getting that kind of minimum flow, there is virtually no difference between temperatures entering and exiting the radiators. At a steady state operation, there might be only 1 or 2 C difference in water temps between entering and exiting the radiator. It's the large volume of water that transfers the majority of the heat, not the temperature drop of the water.

Hose up your system the most convenient way possible to reduce clutter. thumb.gif

I'd love to see the final product!
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post #4 of 32
I'm concerned that the one rad will reduce the cooling efficiency of the downstream cooler by warming the down stream air.

Dude is not joking about the high static pressure though. Might even want to go centrifugal turbine fan. (they're used in vacuum cleaners, they're all about static pressure) One cool thing about those is they can potentially blow in two directions at once. They also blow air at 90 degrees to the inflow.
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post #5 of 32
Quote:
Originally Posted by bombastinator View Post

I'm concerned that the one rad will reduce the cooling efficiency of the downstream cooler by warming the down stream air.

Dude is not joking about the high static pressure though. Might even want to go centrifugal turbine fan. (they're used in vacuum cleaners, they're all about static pressure) One cool thing about those is they can potentially blow in two directions at once. They also blow air at 90 degrees to the inflow.

Well it depends on the radiators he is planning on using. I wouldn't be terribly concerned about 9 FPI radiators stacked together with 1500 RPM fans. But if performance is key and lower temps are more important than noise, high FPI and SP fans are the way to go.

I also agree with you on the downstream air being hotter. It would be an interesting experiment to conduct to see whether or not that has a big enough impact on the water temps that it should be avoided.
post #6 of 32
I'm actually rhinking of doing something very semilar to this with my build. I was actually thinking of send the hot water to the top radiator first then to the bottom then back to the system. This way maximising the work of the colder radiator.
post #7 of 32
Quote:
Originally Posted by 15goudreau View Post

Well it depends on the radiators he is planning on using. I wouldn't be terribly concerned about 9 FPI radiators stacked together with 1500 RPM fans. But if performance is key and lower temps are more important than noise, high FPI and SP fans are the way to go.

I also agree with you on the downstream air being hotter. It would be an interesting experiment to conduct to see whether or not that has a big enough impact on the water temps that it should be avoided.

mmmm... yesss.. Do please try it anyway. Inquiring minds an all that.
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post #8 of 32
something something for science
post #9 of 32
Think of the difference between an ST30 120 rad and a UT60 120 rad. The ST30 is one row of tubes, the UT60 is 3 rows of tubes stacked together. So what is different to a single UT60 and two or three ST30's stacked on top of each other? Very little.

Stacking twin 60mm rads would be even less an improvement than stacking thin rads.
Edited by Jakusonfire - 3/6/14 at 7:30am
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post #10 of 32
Staking radiators kills efficency. Martin has done testing and concluded the following:
Quote:
The first, shocking realization is this: The stacked rads almost always perform worse than the solo rad with the same number of fans. The rest of the data is as expected: Two separate rads perform best, more fans are always better and the airflow going from warmer to cooler rad is slightly worse than the other way around.
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