Exergy’s equipment at GreenEco’s Sarayköy plant in Turkey utilises their proprietary ORC system called Radial Outflow Turbine (ROT).
This system is designed to convert geothermal heat into electrical energy efficiently. In the Sarayköy plant, geothermal water with temperatures 130-170°C is extracted from depths between 1,600 and 2,400 meters. This hot water transfers its heat to a secondary organic working fluid within the equipment via heat exchangers. The vaporized organic fluid then drives a turbine connected to a generator, producing electricity. Afterward, the cooled geothermal water is reinjected into the reservoir.
Some features include: (1) the radial outflow turbine expands fluid radially outward rather than axially; (2) higher efficiency at medium-to-high geothermal temperatures due to better energy extraction per stage (up to 9 stages on a single disk turbine); and (3) uses regenerator to recover heat, improving overall efficiency, especially in higher-temperature applications.
