Electronics > Mechanical & Automation Engineering

freeze dripper technological requirement?

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coppercone2:
So I am trouble shooting something that I read can be found by freeze spray (noisy transistor detection) and I had a futuristic idea.

So buying chemicals sucks, and liquid nitrogen is really cold. I imagined a battery powered 'wand' that could condense atmospheric air into a freeze drip for whatever cooling requirement, to replace the aerosol can.

It seems like something that might be around one day.

How far off are we from such a technology? Some kind of micro compressor to cool a drip spike, so kind of like a reverse soldering iron. I think I saw a 'Yautja' using a tool like this for fixing a console when I almost hitched a ride on a space ship once, but thats a long story.

IanB:
There's no practical way to create liquid nitrogen instantly from air in a hand-sized device, however I think it would be possible to create something that makes liquid air that is small enough to fit in a home workshop.

The trouble is that liquid air contains liquid oxygen and is therefore dangerous (it would be a fire/explosion hazard). Separating liquid nitrogen from liquid oxygen takes a lot more effort and is not likely practical in a small package.

coppercone2:
those missile coolers are pretty small, but their not cold enough.

I imagine it would need a moisture scrubber. But if the point is to make 1 drop of liquid air every say 15 seconds, I don't think thats a particular hazard....

So in addition to a adamantium compressor, you need some kind of micro nitrogen separator membrane, so you blow a stream of nitrogen over the tip like a tig torch shield.

Hopefully we can buy these in 5000 years, powered by 2 AA alkaline cells and sold for $20 by general tools near the engraver and disposable electric screw driver.

IanB:
A drier to remove moisture is a necessary thing, but it's not the only barrier. To liquify air requires what is effectively a refrigeration circuit, and these things take time to cool down to operating temperature (think how long it takes your freezer to cool down after you switch it on from room temperature). So liquid air can be made, but it can't really be made instantly.

coppercone2:
It says cryocoolers can run on as little as 3W and also have temps of -160. I think its kind of getting close to liquifying air. Just too damn big.

I hoped someone had some fun idea about miniaturization obstacles etc

Look at these
https://aerospace.honeywell.com/us/en/products-and-services/product/hardware-and-systems/air-and-thermal-systems/joule-thomson-cryogenic-minicoolers

google for that page showed this pic, but its not on the page


but the time graph shows like 2 hours to get to temp. needs improvement.
https://cryocoolers.eu/joule-thomson-cryocoolers-self-regulating/
https://www.sciencedirect.com/science/article/abs/pii/S1359431120339983

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