DIY Liquid Nitrogen for Less Than $500 - Ben Krasnow

[NOBOX7]

this machine kicks ass, i would make liquid o2 with it ...

[NOBOX7]

whats less then 500$ the electricity to run it, i see about 9,000$ or more worht of hardware there, no way that machine cost under 500$ the air lines , fittings and desicant cannisters and filters... alone cost you well over 500$, i build this kinda stuff in my dreams dood wen im rich , even if it was made outa parts from china painted with radio active lead paint it would still cost you well over 500$

[DrMario2007baka]

@nicktohzyu, yeah but what about the tubings that's exposed to liquified Nitrogen? It's no big deal when sealed and packaged, the problem lies in how the air refrigerator / compressor hardwares are built - some DIY hardware aren't even built that way so Oxygen is, safe to say, always present. And yes, filters are a must as you want the pure stuff - impure LN2 tend to evaporate quickly for some reasons.

[Digadogup]

ear rape

[timerider4]

That is awesome. I would love to be able to build that.

[deaultusername]

The noise is horrible. Sound like you would require ear plugs if was a work enviroment.

But aside from that have a question.

The helium in the cooler do you have to fill it up and where would a diyer get such helium.

[jeriellsworth]

@deaultusername Sorry about the noise. Sorry it's not my project, so I can't say for sure about the helium, but I suspect there is a recharge fitting from what I know about helium. Helium is a tiny little molecule and leaks out easily. This is why it's used in vacuum leak tests.

[omnicide6661]

@jeriellsworth helium is an atomic element, not a molecule.

[WiztotheIzzard]

@deaultusername The helium is sealed in to the Stirling cryocooler permanently, and is not meant to be refilled.

[magicstix0r]

@deaultusername Party supply centers tend to sell tanks of helium for balloons. I also bought a small tank of helium at Wal-mart once for an unrelated project.

[DrMario2007baka]

Gotcha. N2 membrane filter is quite hard to find, though. the older method to get specific gas was to repeatedly cool all gases down and seperate them by their temperature (Kelvin) points. It was mentioned in few quite ancient science books my school's library chucked out. I still have them - i think it was toward physic / chemistry. Guess the filter is much more efficient than just to selectively cherry-pick the gases by their liquefying temperature.

[DrMario2007baka]

Plus, be very careful around Liqueified Oxygen that results from that kind of cooling: It ain't flammable, but it has a habit of making everything else as explosive. Oxygen is an oxidizer, so don't smoke your favorite brand of cigarette while making LN2, or it could be your last.

[jeriellsworth]

@DrMario2007baka He mentions the N2 membrane filter, so it's only condensing nitrogen. 

[limitedgovt999]

@jeriellsworth

Amazing, DIY Liquid Nitrogen man meets DIY N-MOS transistor woman! We're lucky that there wasn't a space time discontinuity.

[willieturnip]

@DrMario2007baka

I'l smoke cutter choice then, shame I like gold drum more..

[nicktohzyu]

@DrMario2007baka thats what the filter is for...

[DrMario2007baka]

It's possible to make one outta garbage parts (mostly from fridge) - You're largely on your own to figure out how to shock-cool the air into liqueified Nitrogen. Dry ice and ammonia slush should work. And, also a word of warning: Liquefied Nitrogen's extremely dangerous as it's quite cold - down to about -270 F. Just don't try to put any body parts into what looks like water - it's liquid Nitrogen...

Use a ventalized Thermos to store it safely too (you can use a professionally made LN2 dewar).

[vmelkon]

I believe that a japanese company wanted to make home fridges with this. The article stated the cost would be too high, 5000$.

[Films4You]

What... itsn't cold enough with the snowy weather.

Poor mans version watch?v=14B8LynojI4

[OfficeThug]

That's pretty ingenious compressing Helium to cool the air. Classically liquid N2 is made by compressing nitrogen gas as much as possible, in which case it becomes too hot to liquify anyways. So they use a bit of that compressed nitrogen gas and blow it onto the compression chamber from the outside. As the gas outside exapnds and cools, it cools down the remaining nitrogen still compressed inside the tank, which is then uncompressed and the whole process is repeated.

[lekernel]

This is crap. He was lucky enough to find a cheap cryocooler, period. Now, make a liquid nitrogen generator still for less than $500 and out of reasonably obtainable parts and only then I'll be impressed.

[lekernel]

This is crap. He was lucky enough to find a cheap cryocooler, period. Now, make a liquid nitrogen generator still for less than $500 and out of reasonably obtainable parts and only then I'll be impressed.

[Membrane556]

I have to build one of these.

[eekcage]

damn gamelan soo loud

[huggybear100]

this is freaking amazing , i love DIY's and this is at the top of the list of coolest things you can do yourself. i so want to make one, seems pretty simple if i could find all the componets , i guess liek anytihng ha

i guess it'll just be a pipe dream , good work to Ben

cheers

[e13373]

ARGH! MY EARS!!! :'(

[orion1077]

that guy at the back...the one who is banging frying pans together....somebody hit him with something hard...!!!

[fl0r1svdk]

@orion1077 aka one of his pans

[PhattyMo]

The evil ideas are forming!

[kinglonewolf104]

Very cool stuff.

.

&eB

[jigglesnap]

That's cool.

[ytmachx]

Very interesting, but that racket in the background was making it hard to hear.

[kenatiod]

Nice.

[sinistermoon]

That's amazing!  I totally want one.