Advanced exergy analysis of the Kalina cycle applied for low temperature enhanced geothermal system. (15th January 2016)

• Record Type: Journal Article
• Authors: Fallah, M.; Mahmoudi, S. Mohammad S.; Yari, M.; Akbarpour Ghiasi, R.
• Is Part Of: Energy conversion and management. Volume 108(2016)
• Page Start: 190
• Page End: 201
• Publication Date: 2016-01-15
• Subjects: Geothermal system -- Kalina cycle -- Ammonia–water mixture -- Advanced exergy analysis; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2015.11.017
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: Conventional and advanced exergy analyses are applied for a Kalina cycle in an enhanced geothermal system. The results of conventional and advanced exergy analyses are compared. Kalina cycle improvement potential by advanced exergy analysis is defined. The role of components interactions for performance enhancement is presented. Abstract: In recent years, the possibility of using low temperature heat sources has been followed as a hot topic in different research and academic centers. In this regard, the Kalina cycle has been paid a lot of attention because of its promising features. Using the engineering equation solver (EES) software, conventional exergy analysis is carried out in this study for the Kalina cycle driven by a low temperature enhanced geothermal source. After validating the developed model for conventional exergy analysis, the advanced exergy analysis, i.e., splitting exergy destruction rate into endogenous, exogenous, avoidable and unavoidable parts, is performed to provide detailed information about improvement potential of the system components. The results of advanced exergy analysis show that the cycle has high potential for efficiency improvement. It is also revealed that the advanced exergy analysis gives the improvement priority first for the condenser, then for the turbine and the evaporator. From the conventional exergy analysis however, the exergy destruction calculated for the evaporator is higher than that for the turbine.