Liquid Nitrogen cooling

R

Roof Jumper

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• Apr 17, 2002

• #1

I just did a google search, and you can buy liquid nitrogen for $0.60 US per litre!!!!

I was wondering though, is there a pump that could stand pumping that stuff(-195 Celsius)? also, would a standard copper waterblock stand up to it? how much LN2 would you lose do to it evaporating?

 

Tiger

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• Apr 17, 2002

• #2

In order to use LN effectively you would have to have a refrigeration type cycle. i.e. evaporation and then back into liquid form via compression and condensation. As you are probably aware it is not used for this in practical application because the pressures involved in getting it back to liquid form are too high.
It is only ever used in the evaporative phase on a short term basis.

 

OP

R

Roof Jumper

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• Apr 17, 2002

• Thread Starter
• #3

how fast does it evaporate? because who knows, it might only cost around $30 a month(50 litres) which would be fine.

 

S

Spleener

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• Apr 17, 2002

• #4

I saw a project once where the guy built a resevior connected to a heatsink which attached to the slot CPU.. He got -200C for temps.

Problem was MASSIVE condensation with frosting.. His whole reservior frosted over.. Another problem is HOLDING the stuff.. you need a special container. They are EXPENSIVE. Like 500 bucks to hold it. See ebay for those.

I dont know how long a liter would last but yes, it evaporates quicking.. Its boiling point is like -100C or something like that.

Thats likely why its so cheap a liter.. you would probably go through 100 liters in a day if you were running your computer non-stop for 10 hours.

 

Tiger

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• Apr 17, 2002

• #5

The other part that is not factored in here is that the physical stucture of the proc is not tolerant of these ultra low temps. Because they are made of different materials which all have different expansion and contraction rates leads to the proc breaking apart. Someone in Finland destroyed a P4 using LN in a space of about 2 hours in achieving the world speed record which was broken the following day in Japan.

 

Crash893

"The man in black fled across the desert,

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• Apr 17, 2002

• #6

if you want to see how fast it expands

fill a litter bottle half way

put it down
get to a safe distance

in about 5 min it will expand and blow the crap out of the bottle

 

F

Fink

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• Apr 17, 2002

• #7

crash893 said:

if you want to see how fast it expands

fill a litter bottle half way

put it down
get to a safe distance

in about 5 min it will expand and blow the crap out of the bottle

Click to expand...

Heck - about 20 ml of liquid N2 will blow a 2 litre bottle all to hell.

Liquid N2 is nasty stuff, doesn't have a lot of cooling capacity and is not suitable for cooling anything that is producing more than about a watt of energy. It has to be stored in special containers away from oxygen, cuz oxygen will condense inside the liquid N2. It forms a lovely blue solution, but when the concetration of O2 gets too high - boom!!!

 

CyberFed

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• Apr 17, 2002

• #8

what website did you find ln2 for that cheap i want to buy some

 

Y

YMAN

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• Apr 17, 2002

• #9

I have always dreamed on the use of LN!

Do you think any companys will make a
special refrigeration system, Compressor
& all for LN? That would be interesting?

But yes, were did you find that LN?

 

OP

R

Roof Jumper

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• Apr 17, 2002

• Thread Starter
• #10

here:


http://www.osustores.com/shop/produ...List&super_category_no=51&sub_category_no=569

copy n' paste

 

Aesik

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• Apr 17, 2002

• #11

From the webpage:

"This is not an on-line ordering system."

I had to look it up because I knew there was no way anyone was going mail order LN2 in liter quantities, or any quantities for that manner.

BTW, LN2 is not a refridgerant. It's a substance that is a liquid at a very low temperature. Before anyone gets all gung-ho about using LN2 for anything other than screwing around and killing processors, I'd advise some physics lessons.

 

G

glass

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finland.

• Apr 17, 2002

• #12

url to ln2 cooled test in japanese:

http://www.bekkoame.ne.jp/ha/id25302/22es.html

another: http://ja0hxv.calico.jp/pai/ep4p4tesp.html

a short video from finnish site:
http://www.muropaketti.com/artikkelit/cooling/xp_ln2/ln2_kaato.avi

a picture of the same:
http://www.muropaketti.com/artikkelit/cooling/xp_ln2/ln2.jpg

article in finnish about it:

http://www.muropaketti.com/artikkelit/cooling/ln2/index.phtml

dry ice: http://www.muropaketti.com/artikkelit/cooling/dryice/index.phtml
http://www.muropaketti.com/artikkelit/cooling/dryice2/index.phtml



so it's really not that well suited for a long term solution.
and too bad those aren't in english :\

but the pics should give you some 'hand touch' to how it's done.

 

Y

YMAN

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• Apr 17, 2002

• #13

What about one of these cool
thiggies for LN???

http://www.cryomech.com/lnp.html

 

parkan

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I am omnipresent

• Apr 17, 2002

• #14

I would estimate the price at $45,000

 

parkan

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• Apr 17, 2002

• #15

Cryostats on the other hand look rather promising

 

Y

YMAN

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• Apr 18, 2002

• #16

parkan said:

I would estimate the price at $45,000

Click to expand...

They have bigger ones too, up to 100 liter/hour