This idea would work on non carbonated beverages. I think that if you were to pressurize a canned beverage, with air of the same amount of pressure as any other pressurized canned product, and then you released the pressurized air in the can, then it would immediately be a cold drink, and it would never have required refrigeration.This is easily shown by buying one of those cheap "canned air" cans that are used for cleaning computer keyboards, which get very cold if you release the air all at once.This would be a good gimmick for marketing a product and may even be the way that all non-carbonated beverages are packaged one day. And they should only be packaged in small sized containers so that you can drink the whole can before it gets warm.This would also save energy used on vending machines, which currently use lots of energy to cool down water and other sports drinks, at gyms all the time.For maybe a little extra production cost(which people would be willing to pay), and a little more aluminum used per can for sturdiness, you could probably save as much energy is refrigerator operation, as is saved by using compact fluorescent bulbs.Of course special design considerations are necessary for safety and ease of drinking. Maybe a solution is, a small hole to release the air and then another cap or opening, to open after the pressure is released. But a good engineer could easily figure out how to make it work.If nothing else this would be a great novelty to see this one day.

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