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OCN Dave's Air Cooling Guide - Page 166

post #1651 of 2323
Quote:
Originally Posted by Curleyyy View Post

What about if you have 4+ intakes and 1 exhaust. The 4+ intakes would create more air pressure forcing the hot air out faster, no?

Thats one way of setting it up. i prefer a negative flow myself.  

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post #1652 of 2323
2x intakes will balance to 1x exhaust, but not 4x intakes to 1x exhaust. The intakes an only build so much pressure regardless of the number used. We need similar exhaust vent area to intake area. This does not mean the same number of exhaust fans because the good intake fans will push air out exhaust vents same as good fans on coolers and radiators do not need a fan on back of cooler pulling air out.
Think of case as a cooler 140x140x80mm cooler fin pack.
  • A good 140mm fan pushes air though cooler and give 60c CPU temp.
  • Add a fan on back of cooler and the temp may go down to 59c, but no lower.
  • But cover up 3/4 of the back of cooler and CPU temp goes up. We still have the same fan on front of cooler but the back cannot flow all the air out 1/4 the area. And if we put super macho 70mm 45000rpm fan pulling as hard as it can the temp may drop a little, but will still be higher than it was with nothing on the back of cooler. wink.gif

Edited by doyll - 10/21/14 at 2:57am
post #1653 of 2323
Quote:
Originally Posted by Sniping View Post

yay I got my fans today.

the sound of airflow rings through my room


What brand is this?
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post #1654 of 2323
Thank you all for the hints.

IMO Doyll is "quite" right. If I close every hole with an intake fan the air will find another "escape" way and it could generate some additional noise.
Maybe I can leave the bottom hole. The air excess will flow out using that hole.

The others are right on the importance of having intake fan(s) cooling the VRM. So I'll install at least one intake in the top of the case.
post #1655 of 2323
Quote:
Originally Posted by doyll View Post

2x intakes will balance to 1x exhaust, but not 4x intakes to 1x exhaust. The intakes an only build so much pressure regardless of the number used. We need similar exhaust vent area to intake area. This does not mean the same number of exhaust fans because the good intake fans will push air out exhaust vents same as good fans on coolers and radiators do not need a fan on back of cooler pulling air out.
Think of case as a cooler 140x140x80mm cooler fin pack.
  • A good 140mm fan pushes air though cooler and give 60c CPU temp.
  • Add a fan on back of cooler and the temp may go down to 59c, but no lower.
  • But cover up 3/4 of the back of cooler and CPU temp goes up. We still have the same fan on front of cooler but the back cannot flow all the air out 1/4 the area. And if we put super macho 70mm 45000rpm fan pulling as hard as it can the temp may drop a little, but will still be higher than it was with nothing on the back of cooler. wink.gif

like you said, figuring this out involves a lot more than just adding up the CFM of the fans involved. Filters, static pressure, component fans/cooling.

I placed sensors at various places around my case when constructing my neg flow plan and got the case temp to within 2 degrees of ambient.

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post #1656 of 2323
Quote:
Originally Posted by Red1776 View Post

like you said, figuring this out involves a lot more than just adding up the CFM of the fans involved. Filters, static pressure, component fans/cooling.
I placed sensors at various places around my case when constructing my neg flow plan and got the case temp to within 2 degrees of ambient.
Have a basic understanding of how air flows and what affects it helps, but it still requires testing and usually some trial & error positioning of fans to get the best airflow / case & cooler intakes within a couple degrees of room. thumb.gif
That is why the link is in my sig that I refer people to all the time. wink.gif
post #1657 of 2323
Quote:
Originally Posted by ace101 View Post

What brand is this?
delta fans for Macs
post #1658 of 2323
Decided to swap my fans around, and put my two Jetflo 120 mm's in the front. I'll be modding the case to add in a third one sometime soon.
I also swapped my rad fans from pull (fans under rad) to push (fans on top of rad, under case grill)
I then moved the HDD caddy to the middle of the case to make room for airflow and to reduce restriction.

I'm not going to swap the fans back around on the radiator (it actually took 10 minutes to line up the holes) but I feel as if the CPU temps have dropped from 86+ to 70c which is fantastic!!
Doyll your signature threads were a fantastic read, and it's got me thinking on a lot of things.

I'm also thinking about picking up a lamptron fc5 v3 fan controller as described in the third image i'll be modding in two more fans hopefully.
I've also realised that I can't have a push/pull on my rad as the motherboard 8 pin connector is obstructing the path unfortunately, so i might just pick up some thicker delta fans or the likes later on?








Edited by Curleyyy - 10/21/14 at 10:44am
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post #1659 of 2323
Quote:
Originally Posted by doyll View Post
 
Quote:
Originally Posted by Red1776 View Post

like you said, figuring this out involves a lot more than just adding up the CFM of the fans involved. Filters, static pressure, component fans/cooling.
I placed sensors at various places around my case when constructing my neg flow plan and got the case temp to within 2 degrees of ambient.
Have a basic understanding of how air flows and what affects it helps, but it still requires testing and usually some trial & error positioning of fans to get the best airflow / case & cooler intakes within a couple degrees of room. thumb.gif
That is why the link is in my sig that I refer people to all the time. wink.gif

 I just read that link :thumb: In fact I could have written it. I moved, angled, baffled, positioned, and ran smoke through the intakes to watch air movement and took temp readings with remote sensors in three locations in the case for a good long time in many configurations. 

I get the feeling you are not a fan of negative flow setups, and that's okay. I will take my 2C above ambient.

:)

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post #1660 of 2323
full positive is the same as having full negative..both ways draws in more dust
over time..
theres a dude in my town with a haf X
he does full positive fan config..you can clean his rig today..2days max ..and its a complete dust fairy again..
ive tried both..negative and positive..and im
afraid im agree with Doyll (which never happens)
its better to have a good balance between the amount of intake air and exit..
not all cases are designed the same and more case makers these days are opting for the closed front panel look with those useless tiny side vents which aint nearly enough sometimes for proper airflo
throughout the case..i watched another forum today of case mod .900D..good example of this front panel type..the guy hacked that and mod mesh onto it..

so say a case like 900D as example..
how many intake fans would any of you do vs exhaust?

if it was me..id do same as the guy i watched...mesh the front plate..hook 3 140mm fans front intake
bottom..side..and rear even..depending on the cpu cooler type..then top as main exhaust..
whats your guys thaughts?
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