Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
ANALYSIS OF THE EXERGETIC LIFE CYCLE OF RANKINE AND ORGANIC RANKINE CYCLES
Submission Author:
Adriano Leão , BA , Brazil
Co-Authors:
Adriano Leão, Pedro Martins de Oliveira, Valter Estevão Beal, Edna Almeida, Alex Álisson Bandeira Santos
Presenter: Adriano Leão
doi://10.26678/ABCM.COBEM2019.COB2019-0945
Abstract
This study assesses the exergetic life cycle of thermodynamic systems based on Rankine and Organic Rankine cycles, covering two dimensions of the exergy namely here operational and embedded. The operational exergy was studied through the concepts of traditional thermodynamics, considering exergetic losses in the boiler and in the condenser. The embedded exergy was investigated considering the pre-operational stages of the system life cycle with the Cumulative Exergy Demand (CExD) method from cradle to gate. The Thermodynamic Sustainability Index (TSI) was estimated as well. The performances of eight scenarios with different inputs and setups were compared. The scenario with the highest operational performance as well as TSI was also the one with the lowest score considering both the magnitude and the quality of embedded exergy. Contrarily, the setup with the lowest operational exergetic efficiency outperformed in terms of embedded exergy. The inputs with the greatest embedment were the fuels, followed by the refrigerants. Except for the ethanol scenarios, the inputs showed low exergetic quality due to the predominance of non-renewable sources. These results can support design and decision-making.
Keywords
Embedded Exergy, Exergy Analysis, Cumulative Exergy Demand, Life Cycle Assessment, Thermodynamic Cycle
