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Water and steam just too goddamn convenient. Super high latent heat so it can move a ton of energy with a quick phase change, works at reasonable pressures and temperatures, stays liquid all the time when you want it to so pumps work, and it’s so readily available as to be damn near free. Super cool!
also almost non-corrosive, non-toxic, doesn’t damage ozone layer, zero global warming potential, non-flammable etc (lots of organic rankine cycle fluids fail one or more of these. tradeoff is utilization of lower temperature sources)
Solar photovoltaic is the only one i can think of that isn’t just a fancy way to make steam
EDIT
ok let’s clarify to say a method that isn’t related to movement of a fluid that spins a turbine. So not windmills (air is a fluid), not hydro, not geothermal, etc.
“I found a new source of naturally occurring waste heat”
