The "eco-coler" DIY air conditioning

[TWP]

While the name may be a "turn-off" for some, including myself, the concept is valid and might be applied to larger scale uses.

http://www.eco-cooler.com/

I can see this being used for pre-cooling air, not just for living spaces but for a food storage room or animal housing.

Building more than one of these, and mounting them in series may produce even lower temperatures.

One problem is building a heat sink to extract the heat energy which will build up at the restriction point.  Perhaps this could be done using a metal plate or a liquid layer between plastic plates.