Conventional and advanced exergy analyses of a geothermal driven dual fluid organic Rankine cycle (ORC)

H. Nami, A. Nemati, F. Jabbari Fard

Research output: Contribution to journalJournal articleResearchpeer-review


A study on geothermal driven dual fluid organic Rankine cycle is presented in this paper using conventional and advanced exergy analysis methods to provide information about system components interactions. Special operating conditions are performed for system components in order to obtain real, unavoidable and ideal performance. The exergy destruction rate in each component is divided into endogenous, exogenous, avoidable and unavoidable parts to reveal more detailed information about effects of components inefficiency on each other exergy destruction and the real potential of the system for improvement. The conventional exergy analysis reveals that, low pressure vapor generator (LPVG), high pressure vapor generator (HPVG) and condenser (COND) are the most important component by 38.11, 29.98 and 15.93% of the total exergy destruction rate, respectively. Despite the conventional exergy analysis results, advanced exergy shows that only 15% of the COND exergy destruction is avoidable which includes 7% of system avoidable exergy destruction rate. Also, LPVG, low pressure turbine (LPT) and HPVG are the most important components from the viewpoint of advanced exergy because of their considerable endogenous avoidable exergy destruction rates.

Original languageEnglish
JournalApplied Thermal Engineering
Pages (from-to)59-70
Publication statusPublished - 2017


  • Advanced exergy
  • Conventional exergy
  • Dual fluid ORC
  • Geothermal heat source


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