Comparison of sub- and supercritical Organic Rankine Cycles for power generation from low-temperature/low-enthalpy geothermal wells, considering specific net power output and efficiency

► Geothermal power generation from low-temperature sources of around 150 °C. ► Simulation of sub- and supercritical Organic Rankine Cycles. ► Propane, CO2 and 10 other refrigerants as working fluids investigated. ► Power output optimization by variation of the steam conditions. ► Increase of power output with supercritical cycles and suitable working fluid.