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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
On the Physical Exergy Disaggregation Levels for the Isolation of Dissipative Components in the Thermoeconomic Productive Diagrams
Submission Author:
José Joaquim Conceição Soares Santos , ES
Co-Authors:
Daniel Colombo, Atilio Lourenço, Marcelo Aiolfi Barone, José Joaquim Conceição Soares Santos, Silvia Azucena Nebra de Perez, João L M Donatelli
Presenter: Marcelo Aiolfi Barone
doi://10.26678/ABCM.COBEM2017.COB17-1938
Abstract
Thermoeconomics connects Thermodynamics and Economics. In order to carry out a thermoeconomic analysis, a productive structure of the plant must be defined, generally represented by means of a productive diagram, showing graphically the products and fuels of each subsystem and the interconnection between them and with the environment. Exergy is the main thermodynamic magnitude used. Depending on the analysis, different levels of disaggregation of the subsystems and of the exergy flows are required. Sometimes, exergy flows are disaggregated into its thermal and mechanical components. However, most energy system has dissipative components (condensers, intercoolers and valves), whose products and/or fuels cannot be defined in terms of total exergy nor in terms of its thermal and mechanical components. In order to overcome this limitation, in the last years, new kinds of physical exergy disaggregation have been introduced in thermoeconomics as alternatives for the treatment of the dissipative components. Various levels of physical exergy disaggregation were proposed. This work shows that, for each kind of dissipative component, there is an adequate exergy disaggregation level that allows defining its fuels and products.
Keywords
thermoeconomics, exergy components, dissipative units, productive diagrams
