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A comment on Heat pumps, more than you wanted to know (2023). Parent comment

Re:Heat pumps, more than you wanted to know (2023) by hasmanean on Tuesday January 09, 2024 @07:19AM (#38925287)
LBNL had a solid state thermoacoustic resonator the size of a coin, which I read about but never saw it in the market. It was supposed to be able to extract heat from anywhere.
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