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[bob ford <bobford79 AT yahoo.com>]

I don't know how useful something like this could be on a remote homestead, 
or if the power went out.  I'm still trying to find more information, this 
article is only an overview (has a drawing) and doesn't provide a link

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Zero-Electricity Fridge

December 8, 2008, 7:30 AM

How a Zero-Electricity Fridge Will Bring Medicine to the Developing World

Adam Grosser and some geeks from Stanford built a fifty-dollar device that 
could cool vaccines where they're needed most.

  
          
 Hero Design Lab

More than a billion people lack access to electricity and refrigeration, 
which means they also lack access to important vaccines that need to be kept 
cool. Nonprofits are pouring millions into developing vaccines that don't 
need refrigeration, but tech venture capitalist Adam Grosser has a different 
idea: change the fridge. 

Working with a thermodynamics team at Stanford, Grosser built a thermos-sized 
device that contains a refrigerant that's triggered when the device is heated 
and left to cool. It then acts like a powerful cold pack, turning anything 
from a jug to a hole in the ground into a twenty-four-hour minifridge. At 
roughly fifty dollars apiece, Grosser's device could potentially bring people 
in the developing world high-maintenance medicines -- and the simple pleasure 
of a cold drink on a hot day. 

http://www.esquire.com/features/best-and-brightest-2008/no-electricity-fridge-1208