Re: We shut down central Edinburgh with a fridge
It's still used in fridges.
There are 2 main kinds of fridge: Compressor and Heat Exchanger.
Domestic fridges are compressor based, but heat exchanger ones are still made. Mostly for camping. All you need is heat to make them work due to the way the refrigerant works. Ammonia works well at this.
You add heat on one side from a gas flame, or a 240V heater, or a 12V heater, and bingo, fridge works.
No real moving parts, so ideal for a small fridge.