Steam is a substance in the gas phase that is at a temperature lower than the critical point. Due to this characteristic, the vapor can be condensed in a liquid or a solid increasing its pressure without reducing the temperature.
That is, the vapor is a gas that can be condensed at a constant temperature, increasing the pressure. On the other hand, to convert a non-vaporous gas to liquid, it is not enough to increase the pressure, but the temperature must be lowered.
For example, water has a critical temperature of 374 ° C (647 kelvin), which is the highest temperature at…
Steam engines are mechanical devices capable of transforming heat energy into mechanical energy in a rotating axis. This heat energy takes advantage of the energy contained in water vapor at high pressure and temperature.
We consider steam engines all those machines that transform the thermal energy of a fluid into mechanical energy. In general, the fluid must be pre-heated and at the outlet of the steam machine it must be cooled to repeat the process.
Steam machines can be classified into these two types:
- Plunger steam engine
- Turbine steam engine
The first reference of the steam engine is found in the Hellenistic period. Then we talk about experiments to take advantage of the expansion of the compounds due to the change of the liquid phase to the gas (vapor) phase: in particular, the Aeolus cell of the heron. It is a hollow metal sphere filled with water, with the arms tangential to the outlet hole: when water is heated, it vaporizes and the water vapor that comes out of the holes, by rotating the ball itself.
You should also remember the attempts to use Leonardo da Vinci's steam with his car called the Architano. In 1606 the…