The ORC process

Thermal water circuit
Geothermal energy is supplied in the form of hot thermal water from underground (spring) with a pump to the surface and transferred to the other circuit in the power plant, before the cooled water is pumped back into the subsoil through the re-injection bore (sink).

ORC circuit
In the ORC circuit, the secondary circuit, a liquid working fluid circulates, which already evaporates at low temperatures, e.g. refrigerants or liquefied hydrocarbons. After evaporation of the working fluid in the heat exchanger, it subsequently expands in the turbine. The mechanical energy generated by the expansion, which is transferred by means of the generator located on the turbine shaft, is converted into electricity and fed into the power grid (yield). The gaseous working fluid is cooled in the cooler with ambient air, liquefies and is available again for the ORC process.







Downloads


STRABAG Umwelttechnik Geothermal power plants brochure.pdf


STRABAG Umwelttechnik Geothermal power plants fact sheet.pdf