'A thermal power station is a power plant in which heat energy is converted to electric power. In most of the world the prime mover is steam driven. Water is heated, turns into steam and spins a steam turbine which drives an electrical generator.'
Why is H2O chosen? Shouldn't a liquid with a lower boiling point be used?
Also, why can't the following setups be used? Have they all been duly considered?
1) Expanding Liquid: In this setup, a chosen liquid is heated, expanded, and used to push pistons, without getting boiled. As a liquid is hardly compressible, shouldn't the expansion generate a tremendous pressure? Furthermore, no latent heat is involved.
2) Expanding Empty Spiked Solid in a Liquid: In this setup, a specially crafted empty solid is heated in a liquid to give rise to a large increase in volume. The liquid then pushes a piston.
3) Strong Balanced Bimetallic Strips: In this setup, three sets of bimetallic strips/rods are used to push a piston when cooled (and bent when heated).
4) Expansion of Ice: In this setup, freezing H2O in cold regions, natural or artificial, expands by about 9% and is used to push pistons.