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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
PROPOSAL OF AN EXERGOECONOMIC PERFORMANCE INDICATOR FOR EXISTING COGENERATION SYSTEMS
Submission Author:
Fernando Nunes , SC
Co-Authors:
Fernando Nunes, Nury Audrey Nieto Garzón, Edson Bazzo
Presenter: Fernando Nunes
doi://10.26678/ABCM.ENCIT2020.CIT20-0459
Abstract
Brazil is facing an important energy transition, not only in matters of clean technologies but also concerning regulatory modernisation, bringing new policies and methodologies to the sector. For instance, the electricity spot prices will be hourly based from January 2021, which will provide empowerment for consumers and generators in periods of excess supply or scarcity throughout the day. This work focuses on developing an advanced exergoeconomic methodology for existing cogeneration power plants using the Specific Exergy Costing (SPECO) method, by quantifying their generation cost performance in comparison to the electricity price on the grid. The exergoeconomic analysis was constructed and exemplified to the CGAM cogeneration cycle as two new concepts are proposed: the unavoidable part of exergy destruction, which is the exergy destruction calculated under design conditions, and the Exergoeconomic Performance Indicator (EPI) for existing cogeneration power plants. The investment costs were considered as sunk costs and the operation and maintenance costs were neglected for simplicity. Therefore, only fuel cost was taken into account to the analytical development of the EPI. Finally, the proposed EPI can be used to measure the inefficiencies of existing plants and their impacts on generated power costs in comparison to external electricity spot prices.
Keywords
Advanced exergoeconomic analysis, Exergoeconomic Performance Indicator, Energy transition, Energy market, Cogeneration power plants
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