Name: Raphael Amorim Lorenzoni
Type: MSc dissertation
Publication date: 21/12/2017

Namesort descending Role
José Joaquim Conceição Soares Santos Advisor *

Examining board:

Namesort descending Role
Atilio Barbosa Lourenço Co advisor *
Felipe Raul Ponce Arrieta External Examiner *
João Luiz Marcon Donatelli External Examiner *
José Joaquim Conceição Soares Santos Advisor *

Summary: Thermoeconomics joins concepts of Economics and Thermodynamics in order to describe the cost formation process of overall thermal systems. It has great applicability in product cost allocation, optimization and diagnosis aiming to reduce operational costs. The thermoeconomic diagnosis is applied to identify the source of extra fuel consumption in the presence of faults or deviations in design conditions and its respective impacts in each system component for the sake of defining a maintenance priority in a programmed stop. In this work, different thermoeconomic methodologies (E, E&S, H&S, UFS and UFS) are applied in the thermoeconomic diagnosis of different thermal systems by the fuel impact formula focusing on evaluating the accuracy and quality improvement of the results through the dissipative equipment isolation in the productive structure and physical exergy disaggregation. The analysed systems are chosen according to its dissipative equipment: a vapour power system (condenser), a heat pump (valve) and a refrigeration system (condenser and valve). The E and E&S models showed to be inadequate in all scenarios as they do not allow complete equipment isolation in the productive structure, WHERE the latter also presents thermodynamic inconsistencies. The UFS and H&S models are considered a good option to evaluate vapour power systems quantifying the faults in all components. The UFS and UFS+ models are the only ones who allowed total equipment isolation for the heat pump and the refrigeration system. Nonetheless, the influence of the productive diagram fictitious unities does not allow an exact analysis of the anomalies impact for the last two systems.

Key words:
Thermoeconomics, Diagnosis, Dissipative Equipment, Exergy Disaggregation.

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