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Static Pressure Fans better at Airflow with Dust Filter? - Page 8

post #71 of 77
Quote:
Originally Posted by mtcn77 View Post

Okay, you have filled the starting point and the ending point of the line. Iterate more and compare their areas under the curve. In the end, you should reach some graph similar to this: Warning: Spoiler! (Click to show)

Sorry, I don't understood
Quote:
Originally Posted by mtcn77

It should always be a wise pick choosing a fan with regard to airflow versus static restriction graphs because air flow is constant per restriction.

The airflow/striction is not a constant ratio. AP-15 is 57cfm@2.0mm H2O & Cougar is 70.5cfm@2.2mm H2O, but when all data is graphed below; at 0.04"(1.0mm) H2O Cougar is 34cfm & AP-15 is 42cfm... 8cfm more than Cougar while specs show AP-15 having less performance by 13.5 cfm & 0.2mm H20. Of course as cfm increases so does resistance which give us the real world curve. wink.gif
http://martinsliquidlab.org/2013/02/18/why-static-pressure-max-flow-specs-are-poor-measures-of-fan-performance/
post #72 of 77
Grab a real delta and experience airflow with no divergence! biggrin.gif
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post #73 of 77
"Unit" air flow versus "percentage of restriction" is constant, what you are describing is "airflow variability across the restriction spectrum". It also varies across rotational velocity:

Force = mass x velocity
Power = Force x velocity
z(impedance) = force / velocity; so the more inertia a matter has, the slower it moves; hence we need a more powerful propulsion. Yet we need to restrict rotational velocity of the rotor because it is the major contributor of air pressure. In respective order, rotor torque is the second cause of noise which is heard as the unavoidable "hum".
You are a good show stealer, redundancy guy.thumb.gif
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post #74 of 77
Lowering the rpm also lowers the cfm and static pressure.
That's just common sense. wink.gif
How does that apply to OP's original question? :
But whatever. rolleyes.gif
Edited by doyll - 9/11/13 at 3:46pm
post #75 of 77
Quote:
Originally Posted by WuMyster View Post

Thank you for the info and a rep is well deserved. It seems that the majority believe that static pressure fans should be used and so that is exactly what I will do.
Now for the actual choosing of fans. I will downvolt fans to 7V temporarily for a few days until i get an aquero 5 in.
Would the GT AP-15 be the best choice? Corsair SP QE / PE?

In terms of raw performance of air flow vs noise, the GT AP15 will come on top. Truth be told, depending on your needs, you could consider the AP14, which is often only a degree or two warmer in exchange for quieter operation.
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post #76 of 77

In my previous rig I used a combination of two AP-14's on 5 Volts and one AP-12 on 12 Volts.

 

Five Volts was easy to get by swapping a wire in Scythe's Molex adapter. The AP-14 runs at 700-750 rpm at 5v. The AP-15 runs 750 rpm or so at 5v. The AP-12 runs 800-900 rpm at 12v.

 

These are my experiences with four AP-12's and six AP-14's. When a GT runs 700-800 rpm, it is nice and quiet while still moving air.

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post #77 of 77
Thread Starter 
Sorry for not posting. Been busy but have been reading all the posts!
I am sticking to the AP-15's since I have some spare and they are also what seem to be most recommended here and other places.
Ive been running them on 7V which was a bit loud for me. Tolerable, but loud. Ill try them at 5V when I get back to my PC!

Feel free to keep posting. Would like to learn your thoughts and gather more information!
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