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near-vacuum pressure induced cooling

post #1 of 27
Thread Starter 
will having extremely low pressure inside my case cool down the temperature of the air (and thus system) inside it? it makes sense doesnt it?

lets, without taking into account that real gases arent perfectly ideal (the correctional formula is LOOONG) do some pvnrt (we can assume that pv is APPROX nRT)

PV=nRT

lower P (****load of fans blowing out), volume(V) of case doesnt change LOL, lets seal the case so gas cannot pressure diffuse in (n doesnt change then) and R is a constant (.08206Latm/molK or 8.314 J/molK)

but then, when there is little or no air in the case, what will happen to the fans? will they break from the pressure of the air trying to get in?
    
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post #2 of 27
oh boy... i can't wait to hear what some ppl come up with for this.
If you want a full understanding, i can refer you to a textbook

HERE
It's my text from Fluids 1 and 2

i will wait to hear what others have to say before i chime in more!
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post #3 of 27
Honestly I don't think that any case can be perfectly seal a vacum. The fans however will not break becuase of that becuase even with the most powerful computer fans you couldn't make a perfect vacum. From experiece though having negative pressure is the best way to get rid of heat.
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post #4 of 27
Thread Starter 
so as long as the pressure inside case is at least relatively low compared to the surroundings, i will get some extra cooling right?


thalove doctor, just tell me if you think/know it will work or not. your strange statements sound either mocking or truly helpful...i cannot tell which
    
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post #5 of 27
Here's an experiment, overclock a computer in a space shuttle and see what the max temperature is. Zero gravity, zero pressure, and a constant temperature (being that the Shuttle has air conditioning). Why do you think Nasa gets all of the good technology....lol.
    
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post #6 of 27
Vacuum = insulator
http://en.wikipedia.org/wiki/Vacuum_flask

Youd fry your comp
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Very nice!
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post #7 of 27
Thread Starter 
so i have a super server tower case, thats UBER CHEAP (it was $16 shipped) twice the size (height and width) of full-T and modded to the max lol i love it, anyway i got a box fan the same size as side panel. i did some testing with some of my dad's equipment in his physics lab and found it to do 3500CFM on high. so what if i put this on my side panel blowing out?? blowing in??
i was thinking out because that would greatly decrease pressure.

in fact i could use two fans. maybe a push pull *****!!!
    
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post #8 of 27
Thread Starter 
Quote:
Originally Posted by J3r3my View Post
Vacuum = insulator
http://en.wikipedia.org/wiki/Vacuum_flask

Youd fry your comp

its not a perfect vacuum...so

no i wouldnt
    
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post #9 of 27
There are a few things wrong with your theory. PV=nRT applies for a closed system. The CPU is adding a lot of energy. Creating a vacuum will lower temps while the gas is decompressing. Once the decompression is complete the temp will rise again just like at room temperature. In fact, it would be worse since there would be less air passing over the heatsink making your air cooling useless (as if you have a 5 CFM fan)

**EDIT**
Another thing too. The wiki link says that a vacuum is an insulator. If you were to create a vacuum you would immediately destroy your proc since the thermal energy cannot diffuse to anywhere.

Bottom line - air cooling in a vacuum is the same as no air cooling at all (because *gasp* you have no air)
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post #10 of 27
Actually, lower pressure would mean less heat conductivity (higher temps). It's better just to have a stream of rushing air inside the case than any pressure differences at all. I would think that a higher pressure would be better.

In either case the same amount of air is coming in, just from different places. When the pressure is slightly lower than outside, the air is being pulled in from all of the cracks in the case. When the pressure is higher, air is being drawn from the intake fan and out of those cracks, and the back of the computer is usually not the best source for cooler air.

I would suggest creating a slightly higher pressure, but putting the intake fans on the sides or in front of the case.
    
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