you can already buy LPG refrigerators.

http://www.nextstepenergy.com/html/refrigerators.htm

This would take a lot of propane. Why not a campfire-powered cooler? A black metal plate covering one side of the cooler (but thermally insulated from the cooler) would be the salt absorber chamber, with dry ammonia sealed in the closed piping system between the plate and the main cooler body. To charge it up, just put the black plate right next to the campfire until it pings (250 deg F) to drive the ammonia out of the salt chamber, then move the whole cooler away from the fire, or just let the fire burn out. As the plate cools, the ammonia around the cooler body boils and transports heat back to the salt chamber where it is radiated away. This is the original ice-plant technology from the early days of refrigeration. Sounds like a fun do-it-yourself project!

Natural gas is a lot cheaper than propane. If it worked for a refrigerator, it would be much more useful to use it for air conditioning. However, I think the problem is that that sort of refrigeration is much less efficient than compressor-based refrigeration. I have thought that a natural-gas powered refrigeration compressor might make sense, particularly for commercial buildings. You would have to get lots of local building codes changed, or get a state or federal override - CA would be a good place to start.

When I lived in Jacksonville IL in the early 1970's, they had a municipal powerplant that was made out of a jet aircraft engine - a friend of mine did the study that showed it was cheaper than connecting to the regional power supplier - but they did anyways and dumped the local electrical generation.

It's a "fantastic idea" -- a PORTABLE propane cooler, even if cooling capacity is less than 1 cubic foot (a LOT willfit into a cubic foot... although I would probably wantto use a 20lb. tank). It's something I would buy in a heartbeat. I'd even buy an 8" deep x 8" high x 12" long cooler--you'd be surprised what can be squeezed into what you think is too small a space.

I'm talking for longer-term campers or remote cabin-dwellers,not weekenders -- ice and a regular cooler would suffice for them.

Despite the silly negative comments propane fueled coolers are available and do work just fine. One small disposable cylinger powers the unit for about 3 days. Or, you can use 12 VDC or 110 vac. Google search for propane coolers or follow this link.http://www.propaneproducts.com/Merchant2/merchant.mv?Screen=CTGY&Store_Code=propprod&Category_Code=Refrigeration

They're available at a price. The ones I've seen are priced from $600 to $1200. They can be used as freezers or as refrigerators, but not both, I think.

They work fine for camping, or in places where there is no electricity. Local governments might want to have these handy for use in emergencies.

See Dometic DRC4000 Portable refrigerator.120VAC/12VDC/Propane

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