The Organic Rankine cycle (ORC) is named for its use of an organic, high molecular mass fluid with a liquid-vapor phase change, or boiling point, occurring at a lower temperature than the water-steam phase change.

A closed Organic Rankine Cycle power system for producing power from an alternative energy heat source such as solar energy or geothermal energy. The system comprises, a vaporizer (12) in which liquid organic working fluid is vaporized ...