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Would this blow up? - Page 2

post #11 of 17
Quote:
Originally Posted by railfan844 View Post
The ln2 wouldnt work any better than water, since it wouldn't boil, no heat would be absorbed.
it would boil so vigorously that it would literally blow the loop apart...

The boiling point of nitrogen is -195C. If the temp is above -195C at atmospheric pressure then the nitrogen will boil... The entire concept of LN2 cooling is that it absorbs heat through its phase change from liquid to gas AKA boiling.
Edited by Epitope - 6/3/11 at 11:29am
    
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post #12 of 17
Quote:
Originally Posted by Epitope View Post
You wouldn't be able to even close the loop before it blew apart on you. I work with LN2 in my lab all the time. I have messed around trying to put some in plastic microcentrifuge test tubes. You can close the lid on the test tube for about 1 second before it either

A. Blows the lid off the tube with a loud bang
B. Makes the entire tube explode like a minature grenade.

They are fun to make and throw at lab mates though.

There is no possible way to use LN2 as a liquid coolant at room temperatures. Not without making a custom loop with stainless steel lines that can handle upwards of 1000 PSI pressure...
This is more fun with Dry Ice...I would quickly put a few testubes together with a piece of dry ice and put them upside down in a tube rack. Then run away. They will start launching out like a rocket launcher. Good times, good times...now I work in IT and I don't get to play little games any more
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post #13 of 17
Quote:
Originally Posted by Epitope View Post
You wouldn't be able to even close the loop before it blew apart on you. I work with LN2 in my lab all the time. I have messed around trying to put some in plastic microcentrifuge test tubes. You can close the lid on the test tube for about 1 second before it either

A. Blows the lid off the tube with a loud bang
B. Makes the entire tube explode like a minature grenade.

They are fun to make and throw at lab mates though.

There is no possible way to use LN2 as a liquid coolant at room temperatures. Not without making a custom loop with stainless steel lines that can handle upwards of 1000 PSI pressure...
Wait wait, so it is actually possible, it just requires extreme pessure? How would the system have to be set up? The liquid nitrogen evaporates on the cpu and then has to be pressurized and forced to recondense? Is there any place that even sells a condenser that can do that to liquid nitrogen? My dad is a welder and he has the equipment to weld stainless so you have me very interested.
post #14 of 17
Quote:
Originally Posted by railfan844 View Post
The ln2 wouldnt work any better than water, since it wouldn't boil, no heat would be absorbed.


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post #15 of 17
Quote:
Originally Posted by hzuiel View Post
Wait wait, so it is actually possible, it just requires extreme pessure? How would the system have to be set up? The liquid nitrogen evaporates on the cpu and then has to be pressurized and forced to recondense? Is there any place that even sells a condenser that can do that to liquid nitrogen? My dad is a welder and he has the equipment to weld stainless so you have me very interested.
Basically you're building a refrigerator at that point. You'd have to take the cooling liquid run it over the components through a radiator system to get the heat out of the system then re-compress the gas back into a liquid ( at about 10,000 psi for room temperature nitrogen gas). This is all compounded by the fact that the change in volume from a liquid to a gas when it boils on the cpu would be very large.
post #16 of 17
Quote:
Originally Posted by Serinox View Post
Basically you're building a refrigerator at that point. You'd have to take the cooling liquid run it over the components through a radiator system to get the heat out of the system then re-compress the gas back into a liquid ( at about 10,000 psi for room temperature nitrogen gas). This is all compounded by the fact that the change in volume from a liquid to a gas when it boils on the cpu would be very large.
I read somewhere that they actually use a turbine to compress something like liquid nitrogen, I assume powered by a high power brushless motor. In a jet engine the turbine sucks the air in, fuel is sprayed in and the shape of combustion chamber actually causes it to pressurize prior to combusion. So I could see how a turbine might compress the gas.
post #17 of 17
check out my DICE chamber in my sig, thats about the closest you can get to what you are trying to do: run aceton or denatured alcohol inside a WC loop that is chilled by LN2 or DICE
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