So Me and My Brother are going to design a LN system....

Stildawn

Stildawn

New Member
My brother is an engineer, and we are going to try design a continous Liquid Nitrogen cooling system....

Has anything like this ever been done before?

Just after any ideas and random fact that we might not know. We have access to 40million dollar milling machines and expensive materials...

So yeah.
 
Well Im in line to join that forum lol cheers....

The thing is that we can get materials etc for free and he can design and build basically everything in the world lol. So we aint spending any money. Just have to do research into what Liquid Nitrogen does when burning off... and what it does in a air tight pressurised system.
 
Stildawn said:
Just have to do research into what Liquid Nitrogen does when burning off...
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It just boils/evaporates. What you need to look into is the heat transfer involved in pool boiling - most likely film boiling but possibly transition boiling, you won't get in the nucleate boiling region.
Stildawn said:
and what it does in a air tight pressurised system
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It creates a bomb. I really hope that you aren't planning on keeping it in a sealed container, and if so, I recommend you reconsider.
 
Thats gonna cost alot of money... it costs $300 or so just for a weekend of benching with ln2, let alone continuous...
 
yeah well we are thinking of somehow recycling the LN2... Like I know it burns off to the gas state.... so then could you then compress the gas and run it back into the system? I know this would require a airtight system.... so some how we have to avoid pressure build up (making a bomb).

What you need to look into is the heat transfer involved in pool boiling - most likely film boiling but possibly transition boiling, you won't get in the nucleate boiling region.
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Can you explain that part in depth as you seem to know lol. I was thinking of something like a water cooled system that moves LN2 over the CPU, it evaporates off and the gas is then collected into a compressor or condeser of some type and then the recycled LN2 is passed over the CPU again.

Its very early stages yet.... But yeah they have off cuts of basically every metal/material known to man at his job. A the owner is a keen engineer himself so would be keen on the idea.

Theres no doubt we can mill up some awesome parts for the system (Im thinking a Silver CPU block lol) and their design tools are insane and awesome.... The matter is whether its actually scientically possible.
 
Stildawn said:
yeah well we are thinking of somehow recycling the LN2... Like I know it burns off to the gas state.... so then could you then compress the gas and run it back into the system? I know this would require a airtight system.... so some how we have to avoid pressure build up (making a bomb).



Can you explain that part in depth as you seem to know lol. I was thinking of something like a water cooled system that moves LN2 over the CPU, it evaporates off and the gas is then collected into a compressor or condeser of some type and then the recycled LN2 is passed over the CPU again.

Its very early stages yet.... But yeah they have off cuts of basically every metal/material known to man at his job. A the owner is a keen engineer himself so would be keen on the idea.

Theres no doubt we can mill up some awesome parts for the system (Im thinking a Silver CPU block lol) and their design tools are insane and awesome.... The matter is whether its actually scientically possible.
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You cant really recycle ln2...if that were possible in a phase change kind of setup then dont you think professional overclockers would use that?
 
Well it might be dangerous or something due to the pressure generate, but if we make it out of titanium or something???

Ill have to do more research lol... Like it might not be as simple as just "recompressing" the nitrogen...
 
Stildawn said:
Well it might be dangerous or something due to the pressure generate, but if we make it out of titanium or something???

Ill have to do more research lol... Like it might not be as simple as just "recompressing" the nitrogen...
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Lol, titanium? Its more than just the pressures, its the way that liquid nitrogen is made, it takes more than just compressing.
 
yeah ive just been reading up on it... So we need to make a small nitrogen cooler... That can be outside the PC.

Im trying to find a picture of the internal chamber of a Nitrogen cooler... cause I dont get the part where they say.

Compressed air runs through a chamber expanding absorbing the heat in the chamber therefore cooling it, repeat the cycle to super cool the nitrogen to make it a liquid
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So from that Im assuming we will pump the evapoured nitrogen into the chamber, which using expanding compressed air running through tubes will cool to form into Liquid Nitrogen again???? Im I getting this right?
 
Stildawn said:
yeah well we are thinking of somehow recycling the LN2...
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Your probably not going to be recycling LN2. The critical temperature of nitrogen is 126.2 K (-147 C) which means that no matter how much you compress it, it won't liquify unless it is already below that temperature. You could build a multistage cooler based on something like the Linde Hampson cycle, but I doubt you have that capability. For reference small commercial liquifiers run about $30K.

Stildawn said:
Compressed air runs through a chamber expanding absorbing the heat in the chamber therefore cooling it, repeat the cycle to super cool the nitrogen to make it a liquid
Click to expand...
So from that Im assuming we will pump the evapoured nitrogen into the chamber, which using expanding compressed air running through tubes will cool to form into Liquid Nitrogen again???? Im I getting this right?
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That sounds like a basic vapor compression cycle, but again you would already need to be under 126 K, so it would need to be several stages.

Typically for LN2 cooling of a CPU you would machine an LN2 "pot" which is basically a large metal open-top container that sits on the CPU. LN2 is poured in and as it evaporates it cools the processor. The nitrogen is not recaptured, which is one reason that it isn't used by many people other than extreme overclockers.
 
That sounds like a basic vapor compression cycle, but again you would already need to be under 126 K, so it would need to be several stages.
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So its not just one chamber that you cool using expanding compressed gas over and over again??? Thats what I got from my reading but Im probably wrong.
 
Stildawn said:
So its not just one chamber that you cool using expanding compressed gas over and over again??? Thats what I got from my reading but Im probably wrong.
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Nope, its not like freon where it can be liquefied at room temperature, you need to have low temperatures in order to liquefy it.
 
yes but expanding compressed gas absorbs heat so therefore I think thats how it cools the nitrogen in the chamber by drawing the heat out of it.
 
Stildawn said:
So its not just one chamber that you cool using expanding compressed gas over and over again??? Thats what I got from my reading but Im probably wrong.
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Not typically, though there are regenerative coolers that use the Stirling cycle (e.g. pulse tubes and GM coolers) that can span from room temperature to sub-LN2 temperature using other working fluids. If you linked to where you're getting your information or told me what cycle you're looking at then I could tell you more. The bottom line, though, is that it is far from trivial to liquefy nitrogen.
 
is that it is far from trivial to liquefy nitrogen.
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yes so I can see.... however he's designed and built such things as nuclear magnetics and all sorts of crazy stuff so it is possible.

I just googled Liquid Nitrogen, Manufacture liquid nitrogen and the like.
 
Stildawn said:
yes but expanding compressed gas absorbs heat so therefore I think thats how it cools the nitrogen in the chamber by drawing the heat out of it.
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Basically, making or liquefying nitrogen at the consumer level is almost impossible, just like liquid oxygen. It requires such low temperatures to make its unfeasible at home..
 
LN2 is for benching, not 24/7 use. Yes, I know I'm prolly stating the obvious but I'm not sure what else to say. :P
 
LN2 is for benching, not 24/7 use.
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Yes that is the norm.... but what if???? I have access to the largest Engineering firm in the southern Hemisphere (or so Ive been told) with heaps of smart are hell engineers lol (my brother included) and basically any material possible.... So we are investigating to see if it might be possible.
 
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