Fan CFM ? in push/pull design - Page 2

Razor6 · 08-06-2004, 06:42 PM

Those 120mm have interesting p-q curves. What ammount of airflow do you get when there are 3 different flow values at the same pressure?

HammerSandwich · 08-06-2004, 11:28 PM

All depends on which of the - ahem - 3 fans you're using.

BillA · 08-07-2004, 09:09 AM

first belly laugh of the day, LOL

Groth · 08-07-2004, 10:07 AM

'Tis true it's funny sounding, but a legit question. Note the p-q curves on the last page, the ones with the stall?

The pressure-flow curve of whatever you stick behind or in front of the fan will look a parabola and will likely only cross the fan's p-q curve at one point. In those cases where a fan exhibits a deeper stall, you can have situations where the flow and pressure are unstable (and get cool oscillations). Generally, it's best choose a fan where you're operating to the right of the peak.

Razor6 · 08-07-2004, 03:32 PM

Yeah ha ha, I was of course talking about any 1 of the 3 120mm fans.

08-06-2004, 11:28 PM	#27
HammerSandwich Cooling Savant Join Date: Oct 2003 Location: 15143 Posts: 358	All depends on which of the - ahem - 3 fans you're using. __________________ www.procooling.com: It's true we are often a bunch of assholes

08-06-2004, 06:42 PM	#26
Razor6 Cooling Savant Join Date: Apr 2002 Location: Houston, TX Posts: 192	Those 120mm have interesting p-q curves. What ammount of airflow do you get when there are 3 different flow values at the same pressure?

08-07-2004, 09:09 AM	#28
BillA CoolingWorks Tech Guy Formerly "Unregistered" Join Date: Dec 2000 Location: Posts: 2,371.493,106 Posts: 4,440	first belly laugh of the day, LOL

08-07-2004, 10:07 AM	#29
Groth Cooling Savant Join Date: Mar 2003 Location: MO Posts: 781	'Tis true it's funny sounding, but a legit question. Note the p-q curves on the last page, the ones with the stall? The pressure-flow curve of whatever you stick behind or in front of the fan will look a parabola and will likely only cross the fan's p-q curve at one point. In those cases where a fan exhibits a deeper stall, you can have situations where the flow and pressure are unstable (and get cool oscillations). Generally, it's best choose a fan where you're operating to the right of the peak.

08-07-2004, 03:32 PM	#30
Razor6 Cooling Savant Join Date: Apr 2002 Location: Houston, TX Posts: 192	Yeah ha ha, I was of course talking about any 1 of the 3 120mm fans.

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