Shroud: Does this make sense to do?

[Utnorris]

So I have 2x MCR220's with San Ace fans setup in a push/pull design at 5v. I was thinking of taking some old fans and gutting them to use as shrouds, I got the idea from here. It would be fan - shroud - rad - shroud - fan. Am I wasting my time or will this give me better air flow across the rads?

Thanks,

Utnorris

[ripken204]

doubling up on the fans barely helps..

[Lu523]

I am in the process of testing something similar now. I have a MCR220 with Yate D12SM-12 fans. Doing some 20 min. runs with Orthos. I will post my finds later.

[Webby]

From what Martin saw when testing on an XSPC RS120 moving from push pull to push pull with shrouds showed a 4% increase in performance (38mm fan with 30mm shroud) It wouldn't hurt performance so I say if you have the room give it a go!

[Lu523]

From what Martin saw when testing on an XSPC RS120 moving from push pull to push pull with shrouds showed a 4% increase in performance (38mm fan with 30mm shroud) It wouldn't hurt performance so I say if you have the room give it a go!



That is why I am trying it out. I did goof on the fan model. The ones on my rad are D12SL-12 not D12SM-12. So the higher speed may help out. Will no more later.

[Utnorris]

Thanks, I will give it a go and let you guys know what happens.

Utnorris

[Lu523]

With the D12SL-12 I had higher temps with the shrouds. Guess the slow speed is not good enough for it. I have been thinking of getting some better fans anyway.
Temps went to 50/43 with the shrouds. Without them I got 48/41. All temps where taken with RealTemp 2.60. I used Orthos for the load testing.
I know it is not a very good test, but I don't have all the equipment that Matrin has.

[Webby]

Did you check the ambient temps when testing? If they had varied by a couple of degrees that would explain the changes in temps you are seeing.

Martin saw benefit in a shroud when running 25mm fans at 1350rpm what speed are/were you running at?

[Lu523]

Ambient stayed the same for both runs.
Specifications:
Model: D12SL-12
Fan Size: 120mm x 120mm x 25mm
Speed: 1350 +/- 10% RPM
Airflow: 47.0 CFM
Noise: 28.0 dBA
Bearing: Sleeve
Voltage: 12 V
Current: .3 Amp Max
Fan Life: 30,000 hours
Connector: 3pin and 4pin pass-through connector
Those are the specs for the fans that I am using. No rpm sensors as they are on a contoller, but I have the turned all the way up.

[Webby]

Hmmm the only way a shroud can make performance worse is if the pressure drop introduced by it slows the air flow significantly enough to counter the benefits of more even airflow and utilising the dead spot generated by the fans hub. Maybe you have a leak between the shroud and the fan or shroud and rad which is allowing some air to escape reducing your pressure through the fan and airflow?

[Polizei]

Ambient stayed the same for both runs.
Specifications:
Model: D12SL-12
Fan Size: 120mm x 120mm x 25mm
Speed: 1350 +/- 10% RPM
Airflow: 47.0 CFM
Noise: 28.0 dBA
Bearing: Sleeve
Voltage: 12 V
Current: .3 Amp Max
Fan Life: 30,000 hours
Connector: 3pin and 4pin pass-through connector
Those are the specs for the fans that I am using. No rpm sensors as they are on a contoller, but I have the turned all the way up.

Controllers usually have a voltage drop across them so I doubt you can run them at 12v. I would guess 10.5 or 11, but I don't know how much of a difference that would make.

[Lu523]

Hmmm the only way a shroud can make performance worse is if the pressure drop introduced by it slows the air flow significantly enough to counter the benefits of more even airflow and utilising the dead spot generated by the fans hub. Maybe you have a leak between the shroud and the fan or shroud and rad which is allowing some air to escape reducing your pressure through the fan and airflow?



That could be part of it. I did not use any type of gasket. Also the shape of the gutted fan may play a part in it. As I said before, I don't have any test equipment. Just useing the pc and what I have on hand.