On the accuracy improvement of thermoeconomic diagnosis through exergy disaggregation and dissipative equipment isolation

Lorenzoni, Raphael Amorim; Santos, José Joaquim Conceição Soares; Lourenço, Atilio; Donatelli, João Luiz Marcon

doi:10.1016/j.energy.2019.116834

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…• The UFS Model separates the physical exergy into an internal energy term, a flow work term and an entropic term (Lourenço et al, 2011). In such situation, the productive structure of an expansion valve (modeled as an isenthalpic process) is defined as follows: its fuel (resource) is the sum of the internal energy term and the entropic term while the product is the increase of the flow work (Santos, 2006;Lorenzoni et al, 2020). Hence, both terms have the same magnitude and the previous problems related to the division of exergy into its thermal and mechanical parts are now avoided.…”

Section: Entropy Point Of Viewmentioning

confidence: 99%

Delving Into Thermoeconomics: A Brief Theoretical Comparison of Thermoeconomic Approaches for Simple Cooling Systems

et al. 2021

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Thermoeconomics combines the concepts of economics and thermodynamics to assess the cost formation process of thermal systems. It has great applicability in the allocation, optimization and diagnosis of product costs. However, some aspects need to be gathered and solved, to have common criteria for its implementation. That is precisely what happens with dissipative components, which are part of cooling systems being so that different criteria are given to evaluate their impact in the cost distribution. In this paper, the state of art regarding the application of thermoeconomics in simple cooling systems is briefly evaluated, by giving the main characteristic of each approach, resolving that there is no a common criterion on the subject of the treatment of dissipative equipment and, therefore, neither on the costs accounting. Therefore, this work compiles and compares the different thermoeconomics methodologies. Consequently, it aims to serve as a tool for the appropriate selection of the thermoeconomics methodology for the analysis of real cooling systems.

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Section: Entropy Point Of Viewmentioning

confidence: 99%

Delving Into Thermoeconomics: A Brief Theoretical Comparison of Thermoeconomic Approaches for Simple Cooling Systems

et al. 2021

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“…Thermo‐economics theory is a comprehensive combination of thermodynamic and economic analysis, widely applied to describe the cost formation process of the thermal system as a whole. It has a strong advantage in dealing with the cost analysis, fault diagnosis, and system optimization of the energy system 1–3 . thermo‐economic diagnosis is a general, methodology that can be used to identify the equipment with faults in energy systems and quantify the additional fuel consumption of the system due to component degradation.…”

Section: Introductionmentioning

confidence: 99%

“…It has a strong advantage in dealing with the cost analysis, fault diagnosis, and system optimization of the energy system. [1][2][3] thermo-economic diagnosis is a general, methodology that can be used to identify the equipment with faults in energy systems and quantify the additional fuel consumption of the system due to component degradation. At present, it has been successfully applied to diagnose various energy systems, such as pulverized coal power plants, 4,5 combined cycle power plants, 6,7 membrane fuel cell systems, 8 and air conditioning cycle systems of buildings.…”

Section: Introductionmentioning

confidence: 99%

Fault diagnosis analysis of combined cycle based on the structural theory of thermo‐economics

Ban

Shi

Zhu

et al. 2023

Energy Science & Engineering

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In this paper, an improved thermo‐economic diagnosis model based on the structural theory of thermo‐economics combined with advanced exergy analysis is proposed in a combined cycle fault diagnosis model. Diagnosis model simulation of a 590 MW combined cycle unit is implemented by EBSILON Professional in terms of advanced exergy analysis method. The characteristic fault value (CFV) required for diagnosis is quantitatively presented and precisely located in the diagnosis model. The results show that with 3% performance deterioration fault of the compressor, gas turbine and intermediate pressure cylinder of the turbine, gas turbine failure leads to three times fuel consumption to the unit compared to the compressor. In contrast, multiple fault diagnosis results show that the fault value generated by each component under multiple faults is not a simple superposition of a single fault. The impact of some component faults is partially offset or increased. However, the increased fuel consumption of the whole unit under multiple faults or malfunctions must be greater than the sum of the increased fuel consumption under a single fault. CFV can effectively perform precise positioning and quantitative analysis on single and multiple fault scenarios of the combined cycle unit. In addition, CFV has strong sensitivity and changes linearly with the performance deterioration of the components, which paves the way for a reliable approach for early‐stage warning and diagnosis.

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Application of H&S and UFS models for a parametric analysis of the exergoeconomic variables of an organic Rankine cycle-vapor-compression refrigeration system

Lourenço

2021

J Braz. Soc. Mech. Sci. Eng.

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On the accuracy improvement of thermoeconomic diagnosis through exergy disaggregation and dissipative equipment isolation

Cited by 6 publications

References 23 publications

Delving Into Thermoeconomics: A Brief Theoretical Comparison of Thermoeconomic Approaches for Simple Cooling Systems

Delving Into Thermoeconomics: A Brief Theoretical Comparison of Thermoeconomic Approaches for Simple Cooling Systems

Fault diagnosis analysis of combined cycle based on the structural theory of thermo‐economics

Application of H&S and UFS models for a parametric analysis of the exergoeconomic variables of an organic Rankine cycle-vapor-compression refrigeration system

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