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To Blow, or To Suck?

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SavannahLion:

--- Quote from: protokatie on December 21, 2009, 06:21:38 pm ---Although I am hearing a lot of "push air in" advice, I am still unconvinced that it is a better move than a single low RPM exhaust fan. Remember my primary reason for this is to eliminate noise.
--- End quote ---

80mm or smaller fans are noisy because there is only so much physical air they can move. Hence, you have a trade off of increased heat for decreased noise.

Find a case that allows a much larger such as 120mm or even larger. I have 177+mm fans that move upwards of 230CFM or more. That single fan moves more air than any of my smaller case fans in any combination. A larger fan would allow you to dial down the RPM and still move adequate air.

Xiaou2:

--- Quote ---You may be forcing air over the components, but as I mentioned earlier, you aren't necessarily getting rid of the heat that begins to build at the top.
--- End quote ---

 WTH are you talking about?!   Heatsinks are designed to wick heat from a device
away from it, then spread it using mega surface area, usually cooled by fans that
push over the fins.   Thats just about how every modern CPU cooler works
today... and there are reasons for that, much as Ive listed.

 Try reversing a modern day CPU fan so that it pulls hot air up rather than blow
air directly At the fins.  You will fry your CPU in no time flat.

 Unless your room is 120 degrees... there is plenty more cool air that Hot.  Forcing that
cooler air across the heated areas forces the heat Away from those areas, and because
you are Flooding the case with cooler air, the heat is easily forced out of the case.

 In fact, its far easier to push heat out of the case rather than to try to Suck it out.
Unless the case is airtight, there is little suction to speak of.  You may simply be
pulling cool air from one part of the case to the other... while not even coming near
the heated areas.
 
 

--- Quote --- Eventually that heat is going to have no place to go but down.
--- End quote ---
   
 Heat RISES! 



--- Quote ---Your analogy doesn't seem quite apt to this situation.  His heat source and object he's trying to protect are one and the same.  As well, those objects are designed to dissipate the heat as best as possible as it is to avoid damage.  Our rumps, notsomuch.  Also, in your analogy, the heat will eventually dissipate around the rest of your body as well, with nowhere to go.  The temps going to rise, so even if you did have a fan to cool your bottom, the rest of you is going to be sweating bullets, and soon bake yourself.

--- End quote ---

 In the analogy, you will bake no matter what.  The difference is How fast.
Put a fan above your head, and you will be fried like chicken in seconds.

 Blow the fan across wise, so that its directed at the heat source and you... and you
might last 10 minutes.



--- Quote ---Of course, I'm willing to admit I'm mistaken, but I am rather certain I've read when presented with only one or the other as the choice, the exhaust is the best choice-assuming it is placed wherever the heat gathers the most.
--- End quote ---

 Well, youd be wrong... and so would all the other clowns who wrote that Crap.


 Put 4 hds stacked in a case, with one cooling fan at the top of the case.  Watch
the temp as you give them a workout.  They will be able to fry an egg in no time...
even If the case itself feels cool/warm.

 Same deal, but have a fan blow air directly across the surface of all the drives.
They will be cool/warm  to the touch.  not egg-scorching hot.

 How do I know?  EXPERIENCE.  (as well as LOGIC)

protokatie:
Tigger, please be more cordial in this thread. I welcome your experience with this sort of issue.

Malenko:

--- Quote from: Xiaou2 on December 22, 2009, 01:38:09 am ---
--- Quote --- Eventually that heat is going to have no place to go but down.
--- End quote ---
   
 Heat RISES! 

--- End quote ---

Your reply was too over the top and scattered for me to completely reply to, but you pulled a chad on this point. As the heat rises and builds up in the top eventually the mass of how air will grow. Since its trapped int he case it will grow downward aka "go down"

Why are you so over the top in your reply? Also, have you read what she wants and how the case is set up? Hard Drive stackig isnt a factor, and she already stated why.

Blanka:
Aren't blowing and sucking two similar words for exact the same process?  :D

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