On the Localized Physical Exergy Disaggregation for Dissipative Component Isolation in Thermoeconomics

Santos, Rodrigo Guedes dos; Faria, Pedro Rosseto de; Belisario, Igor; Barrone, M. A.; Santos, José Joaquim Conceição Soares

doi:10.5380/reterm.v19i2.78618

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…The localized physical exergy disaggregation [21] is used to disaggregate physical exergy only in dissipative equipment where the total exergy is not enough to define a productive purpose for the equipment. In this case study, the valve is a dissipative equipment, and therefore, the disaggregation of physical exergy into its Helmholtz energy (E A ) and flow work (E F ) terms was only used in the definition of fuel and product for this equipment.…”

Section: Localized Physical Exergy Disaggregation (E Model -Ld)mentioning

confidence: 99%

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Thermoeconomic Cost Allocation Approaches in a Simultaneous Heating and Cooling Heat Pump System.

Santos

Lozano

Serra

et al. 2023

36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

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Thermoeconomics is a branch of engineering that combines concepts from thermodynamics and economics to tackle problems that are hard or cannot be solved by these sciences, separately. The main applications of thermoeconomics are cost allocation, optimization, and malfunction diagnosis of energy systems. Defining the productive structure plays a critical role in thermoeconomic modeling, and exergy is a highly appropriate thermodynamic quantity to correlate with costs. For systems containing dissipative equipment, the use of total exergy in conventional productive diagrams need a subsequent decision, by the analysts, on how to define its fuel and product. In some applications, exergy disaggregation can be elegant options, mostly to deal with dissipative components. Nevertheless, all of them increase the complexity in thermoeconomic modelling. In this work, thermoeconomic cost allocation approaches in a simultaneous heating and cooling heat pump system were performed from the application of some thermoeconomics methodologies. The studied system has one dissipative component (valve) and generates no waste. There are three specific objectives. Firstly, to present the different possibilities to treat and isolate the valve in the thermoeconomics modelling. Secondly, to compare the methodologies presented from the thermoeconomic point of view through the cost allocation in a simultaneous heating and cooling heat pump system. And finally, to show the pros and cons of each methodology applied in this study to support future decision-makings in thermoeconomic modelling. The research demonstrates that the differences between the methodologies used were not significant, and the choice of methodology should depend on factors such as the need for disaggregated equipment. In conclusion, the findings of this study indicate that without certain models that may overestimate the cost of particular components, the thermoeconomic results fall within a narrow range of 4% of the solution line. This suggests that the methodologies used did not yield significantly different results.

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Section: Localized Physical Exergy Disaggregation (E Model -Ld)mentioning

confidence: 99%

“…Lourenço et al proposed the UFS model [20], which is an extension of the H&S model. Recently, a method of localized physical disaggregation [21] was proposed to isolate dissipative equipment with less complexity when compared with total disaggregation. However, it can incur a loss in the accuracy of the results.…”

Section: Introductionmentioning

confidence: 99%

Thermoeconomic Cost Allocation Approaches in a Simultaneous Heating and Cooling Heat Pump System.

Santos

Lozano

Serra

et al. 2023

36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

View full text Add to dashboard Cite

show abstract

“…Recently, a proposal to isolate dissipative equipment was presented, which uses the localized physical exergy disaggregation in convectional productive diagram. [17][18][19] This technique allows reducing the complexity involved when compared to the total physical exergy disaggregation since it is applied only on the dissipative equipment.…”

Section: Introductionmentioning

confidence: 99%

On the Arbitrariness and Complexity in Thermoeconomics due to Waste Cost and Supplementary Firing Treatment

Barone¹,

Santos²,

Faria³

et al. 2022

Eng. Sci.

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Cost allocation, optimization, and diagnosis are the main application fields of thermoeconomics. Cost allocation allows evaluating the plant cost formation process. For plants containing dissipative equipment, the use of total exergy flows in the conventional productive diagrams is not able to isolate these components. The physical exergy disaggregation, despite increases the complexity, allows the treatment of dissipative equipment and residues. Nevertheless, conventional productive diagrams based on productive flows and fictitious units to connect the subsystems, may not take into account the physical connections existing in the system flowsheet, making the cost formation process arbitrary. The comprehensive diagram uses both flow types, physical and productive, and the subsystems are interconnected according to the physical flows of the flowsheet. This work aims to demonstrate that the combination of exergy disaggregation and comprehensive diagram avoids arbitrariness. The application of the localized exergy disaggregation at the comprehensive diagram reduces the complexity. A gas turbine cogeneration system is chosen as one application example. Productive and comprehensive diagrams are compared with total and localized disaggregation and a systematic procedure to treat waste and dissipative equipment is presented. The reduction of complexity is performed by means of localized disaggregation and the arbitrariness related to the productive diagram is evaluated.

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The environment as a thermoeconomic diagram device for the systematic and automatic waste and environmental cost internalization in thermal systems

Faria

Barone²,

Santos³

et al. 2023

Renewable and Sustainable Energy Reviews

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On the Localized Physical Exergy Disaggregation for Dissipative Component Isolation in Thermoeconomics

Cited by 3 publications

References 4 publications

Thermoeconomic Cost Allocation Approaches in a Simultaneous Heating and Cooling Heat Pump System.

Thermoeconomic Cost Allocation Approaches in a Simultaneous Heating and Cooling Heat Pump System.

On the Arbitrariness and Complexity in Thermoeconomics due to Waste Cost and Supplementary Firing Treatment

The environment as a thermoeconomic diagram device for the systematic and automatic waste and environmental cost internalization in thermal systems

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