Speculate: How does the Self-Cooling can work?

Factual Questions
1

http://www.icetec.co.kr/english/defult.htm

Not just ‘keep a cold beverage cold’, but chill it down instantly. They go so far as to say it’s some kind of device, rather than some chemical reaction or mystery rays from outer space. Yet a device would require some kind of external power source to remove the heat from the beverage, no?

Unfortunately their message board is all in Korean, otherwise I’m sure I’d have my answer by now :wink:

Any guesses as to what it could be?

2

They’re finally going to market that thing now? I remember reading about it in (IIRC) Popular Mechanics maybe 10 years ago. Anyway, the way it works is there is a small CO2 cartridge inside the can. When you pop the top, the CO2 is rapidly released. This pressure drop chills the cartridge instantly.

3

Almost all self cooling cans designs I’ve seen rely in some fashion on the evaporative cooling power of the release of some sort of gas under pressure either in the can, or in a shell under or around the can in some fashion. I really don’t see any other way you can do it on a practical standalone basis . BTW a “device” can be almost anything in engineering speak.