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dignati
on May 16, 2014
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Kola Superdeep Borehole
That would be a heat pump:
http://en.wikipedia.org/wiki/Heat_pump
darkmighty
on May 16, 2014
[–]
Not a heat pump, simply a heat engine (if you're taking the work) or heat source (if you're using the heat). "Pumping" implies going against the gradient.
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