Name: DANIEL CORONA COLOMBO
Type: MSc dissertation
Publication date: 30/09/2016
Advisor:
Name |
Role |
|---|---|
| JOSÉ JOAQUIM CONCEIÇÃO SOARES SANTOS | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| ATILIO BARBOSA LOURENÇO | External Examiner * |
| JOSÉ JOAQUIM CONCEIÇÃO SOARES SANTOS | Advisor * |
Summary: Faced with the growing energy demand projected for the coming years and the depletion of oil, it is increasingly necessary to apply techniques for the efficient production of electricity and for the rational use of natural resources in thermal systems. Among these techniques is the thermoeconomic analysis that makes it possible to reach systems that operate more efficiently. In the last decade, the models that proposes the realization of the thermoeconomic analyzes using the disaggregated exergy in parcels have gained strength. The application of the exergy disaggregated in Thermoeconomics had the objective of increasing the precision of the results through the EMET model, which disaggregates the physical exergy in its thermal and mechanical plots. Subsequently, the disintegration of the exergy incorporated to its objective the capacity to treat adequately the dissipative equipment and waste. The treatment of dissipative equipment is of great value, mainly for the Diagnosis and Optimization, areas of Thermoeconomics that seek to increase the efficiency in thermal systems. However, the application of the models that disaggregate the exergy brings with it the increase of the complexity of the thereconomic analyzes. Therefore, it is extremely important to compare several thermoeconomic models applied to different thermal systems to establish the cost-benefit of each methodology. There are already works that compare thermoeconomic models, but with the recent emergence of a further level of exergy disaggregation (UFS + model), it is necessary to complement these works with the results of this new model. The results of the thermoeconomic analyzes are strongly influenced by the type of disaggregation used, but this is not the only factor that has an impact on the results.The way the analyst describes the relationship of each productive unit to the others must also be observed. In addition, the treatment of waste has its weight in the sense of varying the final results of the analyzes. In models that use entropy as part of exergy, the treatment of physical waste is well defined and shows no inconsistency. However, the chemical residues were treated in such a way that the exergy balance is not satisfied in the burners of the thermal systems and this is seen as a thermodynamic inconsistency. In general, the objective of this paper is to complement and consolidate the studies that compare thereconeconomic models of exergy disaggregation, to show how different descriptions of the productive process have an impact on the analyzes and to point out the inconsistency generated by the thermoeconomic models when treating waste Chemicals in different ways.
Key words
Thermoeconomic models, Thermoeconomics, chemical residues, UFS +, exergy disaggregation
