Adam Grosser has created an electricity free refrigeration device. Heated over a fire to evaporate ammonia, it then provides Intermitent Absorption refrigeration has the ammonia recondenses internally. The fifth prototype, shown here, can be manufactured for as little as $25, with half an hour of heating over a fire providing 24 hours of refrigeration.
All it needs is a method for maintenance and repair, and it is a great example of appropriate technology
