Air Flow Advice

chroniclard

chroniclard

chroniclard

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Soon to be swapping to watercooling and will be something like below.

UXZ6wRz.jpg


Unsure of best airflow setup.

Thinking 140 rear fan intake.
Front 2 x 120 fan intake.
Top 3 x 120 outlet.

Think that may give a slight positive pressure.
 
wouldnt
1080 -> 360 -> cpu -> res/pumps ->
give better cooling, the 1080 will be feeding the cpu hot coolant in your diagram

will the fans be pushing or pulling on the 240?
 
lude1962 said:
wouldnt
1080 -> 360 -> cpu -> res/pumps ->
give better cooling, the 1080 will be feeding the cpu hot coolant in your diagram
Click to expand...

That's not really how water works.

OP - that set up sounds fine. I'm not a fan of mixing horizontal and vertical flows, but doesn't look like you can do much else with that - so that's probably the best way for you to do it ^_^
 
Component flow order doesn't really matter in this case as the water will all stabilise to the same temperature. :)

The top fans will be pushing air from the case through the radiator out the case and the front fans will be pushing air from outside through the radiator into the case. Then hopefully the 140 at the back will create positive pressure(which may well be pretty small) but its on my desk now so dust shouldn't be too much of an issue.

Will go with that and see how it works. Thanks. :)
 
pastymuncher said:
With 3x 120mm fan's blowing out of the roof I would probably leave the rear fan position vacant.
Click to expand...

My thinking is that a slow largeish rear fan, which is directly below the top fans would pull in cooler air which would almost immediately get sucked up through the top fans.

Got a shed load of fans can experiment with. :)
 
chroniclard said:
My thinking is that a slow largeish rear fan, which is directly below the top fans would pull in cooler air which would almost immediately get sucked up through the top fans.

Got a shed load of fans can experiment with. :)
Click to expand...
Thou i totally get what you are suggesting, I have to agree with Pasty, Thou getting cool air in will help your rad temp I am far more worried about the stalled air inside the case that is cooling your mainboard.

You want to get rid of that heated air asap.

VRM's etc expect at least a decent air flow to remain at low temps.

Something to think about anyway.
 
Ah I see, you think the rear fan might just push hot air around the case and it wont get vented as well as if there was no fan?

I can try it on and off, once I get finished building it.......almost done. :)
 
Just use a single 360 rad and have the rear fan as intake. I say this because your current components add up to a fairly low wattage. I have a similar setup but with a 1700 instead of 1700x and my water temps reach 33 - 34 degrees c with a single 360 rad and a rear intake + 2 front intakes. I have seen 36 deg c during the hottest point of summer, fans spinning at ~950 RPM.

Another rad adds complexity and weight to the build, which may not be worth it. The airflow at the front of the case isn't amazing either, especially when clogged up with dust which doesn't take long to build up in intake rads. In addition, you're taking in air which is then warmed up by the front rad and partially passed through the top rad again.

If you had space for bottom intake fans then you could take cool air from there as well as the rear intake fan, passing it out through both rads. Only then would I recommend a top and front rad configuration. Of course, if you upgrade to a 1080ti or Threadripper then you will have to consider a second rad.
 
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chroniclard said:
Ah I see, you think the rear fan might just push hot air around the case and it wont get vented as well as if there was no fan?

I can try it on and off, once I get finished building it.......almost done. :)
Click to expand...


Its all about air pressure , at the moment you have suck in from the front out the top, if you add more air pressure in from the rear your breaking that movement, as air will be pulled from the path of least resistance, rather than through front of case, through fan, rad etc .. Ill just pull from this wide open fan yes?

As such the air speed inside the case will slow causing stalling, so its heated from a rad, heated from the ram, heated from the vrms and ... just then slowly pulled through top rad.

Maybe I'm thinking too much into this but I have seen in peoples builds where they have a water temp of 30 but then have a 90 'c vrm's and 70 odd 'c RAM but seem to think thats normal.

Horses for courses, just to get you thinking :)
 
It's always worth experimenting with fan directions cause sometimes what works best in reality makes zero sense theoretically. I put a thermometer inside my case whilst doing my experimenting to account for how hot the inside of my case was getting as well.
 
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