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Everything related to heat transfer is still relevant and very, very interesting, but I love how dated the assumption of non renewable energy is now in that method of calculating thermal efficiency.

Who cares if the perfect turbine could only ever convert 59% of the wind power through it!

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Also mentions the Rocket Stove (new to me), which looks well-worth getting to know about. [https://en.wikipedia.org/wiki/Rocket_mass_heater] (Wiki article describes several designs as well.)

"a rocket mass heater consists of an insulated combustion chamber where fuel is burned with high efficiency at high temperature, and a large thermal mass in contact with the exhaust gases which absorbs most of the generated heat before the gases are released to the atmosphere.... "

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