Eli5: Why cant we use boyle’s law to extract energy from hot air

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Things i know:
1. boyle’s law vaguely as; as pressure rises so does temperature.

2.Peltier devices can extract electricity given a large enough temperature differential, are there devices that do this better?

3. Heat pumps can pull heat from cold air on one side and make hot air on the other side.

I know i am missing some major steps here and ifs something ive always wondered about…

In: Physics

6 Answers

Anonymous 0 Comments

You could, in theory, but you’d have to put more energy into the heat pump than you’d get out of it.

I can’t juggle the equations in my head but either you’d always get less energy out of it than you were putting in, or one side of it would have to get hotter and hotter and hotter forever. I think it’s the first one.

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