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Joined 3 years ago
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Cake day: June 14th, 2023

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  • With wind, at least all the moving parts tend to be well above water, only exposed to salt spray (though that’s still pretty nasty).

    Tidal and especially wave have moving components exposed to water, often right on the wind-water line. That makes them corrosion and maintenance horrors.

    There have been plenty of demonstration wave & tidal plants that have produced power, but I think the operation record is about two years, most much less.

    Building and scrapping your plants every year or two is neither cost nor energy efficient.

    Solar, hydro, geothermal, and wind are much nicer to deal with.


  • In moderate climates it is more efficient to burn gas to produce electricity then use that to run a heat pump, than it is to burn gas directly.

    Gas power plants are about 35-60% efficient depending on whether they’re a cheap inefficient peaker or Rankine, or a pricey CCGT plant.

    Heat pumps have a COP of 2.5x to >5 depending on outdoor temperature and series.

    Good gas furnaces/boilers and the grid are both upwards of 90% efficient.

    So a 40% efficient gas plant driving a COP 3 heat pump produces 1.2x the heat that you get from burning the gas directly. That’s close to worst case and you can also run your grid on other fuels.