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 Originally Posted by OngBonga
Also, yes it was indeed ammonia. I went and watched the documentary again. Knowing how to refridgerate something without power could be a useful bit of knowledge!
The ancient Egyptians had A/C in their homes (of a sort). Probably just the wealthy homes, not sure at all.
They would dig long slanted underground tunnels from their homes toward the nile. About halfway there, they would dig out a small cistern and then continue digging forward and back up. This made a V-shaped tunnel, with a small pool of water at the bottom.
The difference in air pressure from the river side to the house side would drive an air flow which was cooled by passing underground, and evaporating the pool at the bottom.
I'm not sure if they did anything to keep the air flowing into the house. (I didn't fully understand the mechanism which keeps the air flowing in one direction.)
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