How do you work out your push/pull setups

D3K · 23 Jun 2015 at 16:18

Massive edit: How do you work out your +ve/-ve pressures should be the title

I run software simulations at work on heat flow in electronic enclosures and the setup can take bloody ages.

I've been quite impressed with how many people on the boards say they have positive/negative/static setups and are entirely confident in their operation so I was wondering how you all go about your calcs for fan setups and what not.

Do you run simple addition/subtraction on the CFM of each fan? edit: i.e. to work out how much is going out compared to how much is coming in
Do you care about the heat when considering the fans, and therefore their positioning, or just the air flow?
Do you factor in baffles/obstacles where airflow can be poor?
Does the baffle effect of a radiator play a factor in your calcs?

pastymuncher · 24 Jun 2015 at 18:48

What's all this calculation stuff? I am sure most of us just grab a pair of identical fans and stick one each side of a rad/cooler with one pushing and the other pulling. Adjust fan speed to suit, monitor temps and adjust as neccessary or connect to a pwm header on the motherboard. In my case I also have a shroud on the intake/push side of the rads to minimise the dead spots caused by the fan motor.

Glanza · 24 Jun 2015 at 19:30

Read up on benchmarks on the rads I wanted at the time.

If it works better with push / pull i.e 360mm Monsta I'll run push / pull.

No fancy calculations or ages spent working it all out

D3K · 24 Jun 2015 at 23:27

I think I brainfarted when I posted. I was intending on talking about pressures being positive or negative which somehow translated into my brain as push and pull - I then got carried away with airflow questions. Flibble

I'm gonna edit the OP.

edit: If a mod could edit the thread title that would be awesome :>

pastymuncher · 25 Jun 2015 at 12:56

That's me out then. Pressure is irrelevant with my rad setup. My rads are mounted in a purpose built filtered box on a windowsill sucking cooler outside air through them. Both rads have 3 fans pushing and 3 fans pulling so 12 in total.