Rankine Cycle - the basics...

Rankine cycle is a thermodynamic cycle used in commercial thermal power plants...

Main components of Rankine cycle: pump (1 - 2), boiler (2 - 3), turbine (3 - 4), condenser (4 - 1).
Image from https://upload.wikimedia.org/wikipedia/commons/0/00/Rankine_cycle_layout.png

The working fluid is H2O (water / steam).

Image from textbook "Fundamentals of Thermodynamics" by Borgnakke and Sonntag (8th edition, Wiley).

As shown above, high pressure can be above 90 bar, and low pressure can be around 0.05 bar

High temperature may be around 500 ⁰C, and low temperature may be a little more than ambient temperature (e.g. 45 ⁰C).

This is a large-scale power production cycle (net output of several megawatts).