Thermoeconomic modeling for CO2 allocation in steam and gas turbine cogeneration systems

Santos, Rodrigo Guedes dos; Faria, Pedro Rosseto de; Santos, José Joaquim Conceição Soares; Silva, Júlio Augusto Mendes da; Flórez-Orrego, Daniel

doi:10.1016/j.energy.2016.04.019

Cited by 30 publications

(15 citation statements)

References 41 publications

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“…According to [10,17,22,51,52], flows that leave the same production unit must have the same unit cost in accordance with the multiproduct criterion, since the same resources produced them, and, consequently, they have equal costs. On the other hand, [42,51,53] consider that for byproduct criterion each plant subsystem can have only one main function or product, being that the other internal productive flow exiting is considered byproduct. Thereby, the byproducts assume the same unit cost as the product of other subsystems that produce only that kind of productive internal flows [25,42].…”

Section: Cost Allocation Problemmentioning

confidence: 99%

“…The physical diagram utilizes the fuel and product principle to obtain the auxiliary equations. According to [18,20,21,51], the product principle considers that all outlet flow of the subsystem (product) have same specific cost. Adversely, the fuel principle considers the same unit cost when the subsystem uses a part of the inlet flow (fuel flow) to produce a product, i.e., the outlet flow carries the same unit cost of the inlet flow.…”

Section: Cost Allocation Problemmentioning

confidence: 99%

“…Thus, there is a correlation between the unit cost of useful heat and the unit cost of net power. According to [51], the straight lines will coincide when the useful heat and power ratio, and the overall exergetic efficiency are the same, regardless of the cogeneration plant. Taking into an account different overall exergetic efficiency, but with the (37) Fig.…”

Section: Cost Allocationmentioning

confidence: 99%

“…[21]. Except the specific exergy costing approach (SPECO model), all the thermoeconomic models evaluated in this work are based on functional diagrams.Lazzaretto andTsatsaronis [21], and Santos et al[51], summarized a general rule in order to formulate the cost equations of a thermoeconomic model based on a productive diagram or a physical structure. No matter whether the thermoeconomic methodology is based on productive or physical diagram, in order to calculate the monetary unit cost (c) of each internal flow and final products, cost equation balances are made in each subsystem of the diagram, as shown in Eq (26)…”

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confidence: 99%

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On the effects of thermodynamic assumptions and thermoeconomic approaches for optimization and cost allocation in a gas turbine cogeneration system

Araújo

Morawski

Barone

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Thermoeconomics connects thermodynamics and economics, providing tools to solve problems in energy systems, both from the point of view of cost allocation, diagnosis and project optimization. A study of a gas turbine would take into account many characteristics: combustion process, change in the composition of the working fluid, irreversibility effects and so on. Considerable simplifications are often required, resulting in several thermodynamic models, which modify the results obtained in thermoeconomic optimization and in different thermoeconomic approaches for cost allocation. In the face of context, a study to verify the influence of thermodynamic models on the results obtained in thermoeconomic optimization and in the allocation of costs, it becomes promising and appreciable as it allows to analyze the difference in results, the reasonableness of simplifications and if it is worth using such a complex model. Thereby, this article compares four thermodynamic models in a cogeneration system: a standard air model, a standard cold air model, a CGAM model and a complete combustion model. The cogeneration system is optimized from the thermoeconomic point of view for each thermodynamic model. After the optimization process, five thermoeconomic approaches are used to allocate costs to the final products. The effects of these thermodynamic assumptions and the thermoeconomic approach on thermoeconomic optimization and cost allocation are presented and discussed. Of the computational effort to optimize the design problem, the complete combustion model is more efficient than the others models, since this model reaches an objective function value 5% lower than the CGAM problem. The analysis of the thermodynamic model variation for the same thermoeconomic method presents that the maximum variation of the unit cost values for useful heat and power is 4.3% and 5%, respectively. Similarly, the variation of the thermoeconomic model to the same thermodynamic model presents that the maximum variation of unit cost values for useful heat and power is 20% and 10%, respectively.

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Section: Cost Allocation Problemmentioning

confidence: 99%

Section: Cost Allocation Problemmentioning

confidence: 99%

Section: Cost Allocationmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

On the effects of thermodynamic assumptions and thermoeconomic approaches for optimization and cost allocation in a gas turbine cogeneration system

Araújo

Morawski

Barone

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…In this criterion, a product resulting from a productive process that generates more entropy is more penalized than a product that originated from a productive process generating less entropy [ 7 ]. This criterion has been used in closed cycles, such as Rankine or refrigeration cycles, gas turbine cogeneration system [ 5 , 6 , 8 , 9 , 10 , 11 , 12 ], and an extraction-condensing steam turbine cogeneration system coupled with a multiple-effect thermal vapor compression desalination unit [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

An Irreversibility-Based Criterion to Determine the Cost Formation of Residues in a Three-Pressure-Level Combined Cycle

Méndez

González

Hernández

et al. 2020

Entropy

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In an energy system, it is important to identify the origin of residue formation in order to implement actions to reduce their formation or to eliminate them as well as to evaluate their impact on the production costs of the system. In the exergetic cost theory, although there are several criteria to allocate the cost formation of residues to the productive components, no unique indication on the best choice has been defined yet. In this paper, the production exergy costs are determined by allocating the residue cost formation to the irreversibilities of the productive components from which they originate. This criterion, based on the Gouy–Stodola theorem, is an extension of the criterion of entropy changes, and unlike this, it avoids the existence of a negative production cost. This criterion is applied to a combined cycle of three pressure levels, and the production exergy costs are compared with the criteria of entropy changes, distributed exergy, and entropy. The results of the proposed criterion are in agreement with the compared criteria.

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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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Thermoeconomic modeling for CO2 allocation in steam and gas turbine cogeneration systems

Cited by 30 publications

References 41 publications

On the effects of thermodynamic assumptions and thermoeconomic approaches for optimization and cost allocation in a gas turbine cogeneration system

On the effects of thermodynamic assumptions and thermoeconomic approaches for optimization and cost allocation in a gas turbine cogeneration system

An Irreversibility-Based Criterion to Determine the Cost Formation of Residues in a Three-Pressure-Level Combined Cycle

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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