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30mm rad with one fan vs 60mm rad in push-pull at low speeds? - Page 3

post #21 of 45
So I gave it a go with 3 front rad fans as intakes, rear fan intake and 2 top rad fans as exhaust and coolant to air delta went up 2 degrees Celsius so that's not a viable solution. Seems given my fan placement limitations, best arrangement remains having all 5 rad fans as intakes. 2nd set of fans should arrive Sat so I will go with push pull and see where that gets me. Thanks
post #22 of 45
Quote:
Originally Posted by zmn668 View Post

So I gave it a go with 3 front rad fans as intakes, rear fan intake and 2 top rad fans as exhaust and coolant to air delta went up 2 degrees Celsius so that's not a viable solution. Seems given my fan placement limitations, best arrangement remains having all 5 rad fans as intakes. 2nd set of fans should arrive Sat so I will go with push pull and see where that gets me. Thanks

Keep them all intake. Worrying about positive pressure preventing your case from intaking fresh air is silly. The fans are more than powerful enough to keep air flowing.
post #23 of 45
Keep in mind you can only pull in as much air as you can push out.

The intake fans can't just pull in air forever. If your single back fan, together with the cracks ands holes, only push out X cfm, than all the intake fans in the world won't be able to pull in more than X cfm.
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post #24 of 45
Would the best way to test this be to run with the side panel off and measure the difference?
post #25 of 45
Quote:
Originally Posted by zmn668 View Post

Would the best way to test this be to run with the side panel off and measure the difference?
There you go!
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post #26 of 45
Quote:
Originally Posted by PepeLapiu View Post

Keep in mind you can only pull in as much air as you can push out.

The intake fans can't just pull in air forever. If your single back fan, together with the cracks ands holes, only push out X cfm, than all the intake fans in the world won't be able to pull in more than X cfm.

But that just isn't true.

Increasing the RPM of the intaking rad fans will increase the flow of both the exhaust fan and the flow out of any vents. There is no fixed limit.
The environment the rad fans are pushing air into (the relatively closed case area after the radiators) is just another level of restriction that contributes to determining overall airflow per rpm, same as the rads themselves. More RPM increases pressure which increases flow.

It would be much the same as saying adding a second water pump to a loop can't increase flow rate. Or maybe rather that increasing the RPM of one pump in a loop won't increase flow if the other pump stays at the same RPM. It doesn't work like that.
Edited by Jakusonfire - 2/27/14 at 5:39pm
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post #27 of 45
Well yes, you and I are arguing semantics.
The point is, too much positive pressure will restrict air flow throught the rads.
A little positive pressure is good, too much of it straps down performance.

Anyway, as suggested, OP could try to run his system with the door open. That will permit free flow of the rad fans. And if he sees a performance increase, he can go from there and decide to add more exhaust fans, or not.

But the faster the air flow, the more important the restriction becomes. Air pressure drop increases exponentially with flow. If the performance drop is barely noticed at slow speed push alone, the difference will increase with more airflow, i.e. p/p fans.
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post #28 of 45
Well yes, using radiators internally at all restricts air flow and performance.

It is just that people see things like that posted by experienced members like yourself and get the wrong idea then spread it on or at least it causes confusion. It is amazing the strange ideas and off logic that many people will accept and then distribute as fact just because they read it on the internet.

I feel we should try to maintain accuracy as much as possible. This was a fundamental principal and the statement very emphatic.
Edited by Jakusonfire - 2/27/14 at 7:35pm
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post #29 of 45
Thank you all for your insight. I ran with the side panel removed and my delta remained exactly the same so it seems I have adequate outflow to handle my single set of fans. Bear in mind they only run at 1000 rpm. Will report back once I add the 2nd set.
post #30 of 45
Just wanted to wrap things up on this. Have had all 10 fans in p/p at 7v (using 7v molex trick feeding NZXT Grid) and I am please. The results have dropped my delta 4-5 degrees and I am getting slightly better performance that I measured with single fans at full 12v. Now considering if I want to use a rheostat to reduce fans a slight bit more. I do not want any bay mounted fan control as I only need 1 channel to feed the Grid. Looking at the Sidewinder 25 watt rheostat and also the old Mcubed fanamp which is alos a 25 watt single channel solution. A bit concerned because it will be in the rear of the air 540 case with no active cooling and I imagine these will get warm to hot feeding 10 fans. Any thoughts are appreciated and thanks
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