The headline [This Fridge Doesn't Need Electricity To Stay Cool] seems like linkbait. It's a fridge that uses ice to keep cool - my grandmother had that technol

The headline [This Fridge Doesn't Need Electricity To Stay Cool] seems like linkbait. It's a fridge that uses ice to keep cool - my grandmother had that technology and it was called an icebox. One fridge that really does cool without electricity is the "absorption refrigerator", which burns propane and uses the heat to cool. I find the process pretty much incomprehensible, but it uses a mixture of ammonia, water, and hydrogen gas. The heat separates the ammonia from the water, it is condensed, and then when the ammonia evaporates it absorbs heat from the fridge. They are useful for recreational vehicles without electricity. http://en.wikipedia.org/wiki/Absorption_refrigerator http://en.wikipedia.org/wiki/Absorption_refrigerator And on the topic of random refrigeration facts, if you've seen air conditioners or chillers specified in units of tons, that doesn't refer to the weight of the equipment. It refers to the number of tons of ice per day required to provide the equivalent cooling. Measuring power in tons (1 ton = 3.5KW) strikes me as very strange.