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I got a alternate tech/science question. Refrigeration is achived by pumping chemicals trough tubes and by letting it expand at a certain point. (I have to admit I need to refresh the details). The way we do it is using electric power. However, I see no reason that running water, muscle power or even wind can't pump a chemical trough a pipe.

Refrigeration would be nice in temperate climate.

So what is the earliest date somebody can put something like this together?
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