Abstract
Organic Rankine Cycle geothermal recovery mini-power plants using moderate temperature (85–150°C) (185–300°F and higher) have been pioneered by ORMAT and are made in sizes of 300–1300 kW factory-integrated and tested modules. The skid-mounted power package module comprises heat exchangers, turbine, generator, control system and low voltage switch-gear as well as valves, safety circuits and piping. Two or more units can be combined for applications where the geothermal or industrial waste heat source is sufficient to permit larger power plants to be economically installed. Experience has been acquired in operation in low enthalpy geothermal projects in Nevada, Utah, California, Oregon and, outside the United States, in Mexico and other countries. Several typical power plants rated 800 kW, 3.2 and 30 MW are described. Reference is made to practical field experience with the units in commercial power generation and to automation in the operation of the power plants.
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