Abstract
In this chapter, we discuss basic, hybrid, and combined geothermal energy systems, such as the direct steam geothermal power plant, single-flash steam geothermal power system (GPS), double-flash steam GPS, single-stage (SS) organic Rankine cycle (ORC) GPS, SSORC GPS with two turbines, double-stage ORC GPS, Kalina cycle GPS, and combined flash/binary. Generally, these geothermal energy systems are expected to primarily produce heat and power in one plant and provide various benefits related to the efficiency, system, operational logistics, environment, and economy benefits. The exergy method is utilized in designing and analyzing the geothermal energy–based power production technologies because it provides powerful tools for analyzing, assessing, designing, improving, and optimizing geothermal energy systems and processes. Also, in this chapter, the examples and case studies are presented for basic geothermal energy systems, illustrating that results obtained through exergetic analysis of basic geothermal energy systems are clearer and more meaningful than those obtained by energetic analysis and help indicate potential modifications to increase performance.
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