Looks like you're talking about https://en.wikipedia.org/wiki/Icyball | Hacker News

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		timeattack on Nov 12, 2019 \| parent \| context \| favorite \| on: Einstein Refrigerator Looks like you're talking about https://en.wikipedia.org/wiki/Icyball

abfan1127 on Nov 12, 2019 [–]

it says its used in RV applications, but I don't see how the described system uses propane to heat a portion of the closed loop.

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