The working principle of the organic Rankine cycle is the same as that of the Rankine cycle: the working fluid is pumped to a boiler where it is evaporated, passed through an expansion device (turbine, screw, scroll, or other expander), and then through a condenser heat exchanger where it is finally re-condensed.

The organic Rankine cycle is is similar to the Rankine steam cycle, but uses an organic fluid such as refrigerants and hydrocarbons instead of water as the working fluid. The ordinary Rankine cycle uses thermal power to convert water to steam, which expands through a turbine in order to generate electricity.

The Rankine cycle is a thermodynamic cycle widely used by power plants to convert water into steam, then expanding that steam through a turbine to produce mechanical work. The organic Rankine cycle (ORC) is a refinement of this technology, using an organic working fluid in place of water.

... The ORC is similar to the conventional SRC but it uses an organic fluid (such as Freon) instead of water (steam) as a working fluid.