> Exactly what is the operating principle of these "Absorbtion"
 > (absorption?) refrigeration devices? Is it convection or is it
 > transition state of a fluid?
You know, I've read descriptions, looked at diagrams, etc. for years and 
still don't completely understand their operation. They use ammonia and a 
bromide solution as I recollect, the ammonia is boiled out of solution by a 
heat source, and somehow causes the thing to cool.
My mother-in-law has an old gas refrigerator that she's had for many years, 
and it still works fine. Served her well during the hurricane of '54.
The big York chillers (they make cold water that is circulated to heat 
exchangers for cooling around the building) where I used to work have all 
sorts of pumps and stuff, but a simple refrigerator needs no power except for 
the heat source. Camper refrigerators operate the same way, using an electric 
heater when the camper is operating from 'shore power'.
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