Application of advanced thermodynamics, thermoeconomics and exergy costing to a Multiple Effect Distillation plant: In-depth analysis of cost formation process

Piacentino, Antonio

doi:10.1016/j.desal.2015.06.008

Cited by 65 publications

(47 citation statements)

References 28 publications

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“…Additionally, the formulation is suitable even at constrained yearly production, and only is undetermined if P i is null, which only might take place locally (in such case, equal marginal costs are ensured in the nearby of that singular point by Equations (19) and (20)) because otherwise this design parameter is not useful. It is important to note that the corrected marginal cost is not a marginal cost calculated through a specific and allowed direction, but a modification of the marginal cost following the path of the i-th design parameter.…”

Section: Lagrange Multipliersmentioning

confidence: 99%

“…And the same can be said when the restriction makes the exploitation costs constant. If R i = E i , then Equation (19) ensures that unconstrained marginal costs are again equal in the optimum. In both cases, the design is quite coherent since it ensures minimum exploitation costs given a yearly production or maximum production given a specific exploitation cost.…”

Section: Lagrange Multipliersmentioning

confidence: 99%

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Thermoeconomic Coherence: A Methodology for the Analysis and Optimisation of Thermal Systems

Rovira

Martínez-Val

Valdés

2016

Entropy

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Abstract:In the field of thermal systems, different approaches and methodologies have been proposed to merge thermodynamics and economics. They are usually referred as thermoeconomic methodologies and their objective is to find the optimum design of the thermal system given a specific objective function. Some thermoeconomic analyses go beyond that objective and attempt to find whether every component of the system is correctly designed or to quantify the inefficiencies of the components in economic terms. This paper takes another step in that direction and presents a new methodology to measure the thermoeconomic coherence of thermal systems, as well as the contribution of each parameter of the system to that coherence. It is based on the equality of marginal costs in the optimum. The methodology establishes a criterion to design coherently the system. Additionally, it may be used to evaluate how much a specific design is far from the optimum, which components are undersized or oversized and to measure the strength of the restrictions of the system. Finally, it may be extended to the analysis of uncertainties of the design process, providing a coherent design and sizing of the components with high uncertainties.

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Section: Lagrange Multipliersmentioning

confidence: 99%

Section: Lagrange Multipliersmentioning

confidence: 99%

Thermoeconomic Coherence: A Methodology for the Analysis and Optimisation of Thermal Systems

Rovira

Martínez-Val

Valdés

2016

Entropy

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“…Such a relationship can be made by means of the fuel-product representation of the exergy cost theory, as seen above. Thus, the thermoeconomic variables can be represented in terms of both the final product and efficiency of each component, as expressed in Equation (16). The total fuel is obtained by:…”

Section: Exergy Costs Of Componentsmentioning

confidence: 99%

“…This theory reveals the critical points of an energy system; in other words, its application unveils the location where the exergy costs become higher, and, at the same time, it allows us to determine the effect of the improvements on such critical issues, such as the costs. Exergy cost analysis appears to be a significant tool in addressing the points of an energy-consuming system, where energy can be saved as proven in different studies including combined heating and cooling applications [15], distillation plants [16], optimization of the transport sector [17], improvement of microwave heating systems [18], as well as in the analysis of natural resources [19,20].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Exergy Costs of a 332-MW Pulverized Coal-Fired Boiler

Rangel-Hernández

Damián

Belman-Flores

et al. 2016

Entropy

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Abstract:In this paper, we analyze the exergy costs of a real large industrial boiler with the aim of improving efficiency. Specifically, the 350-MW front-fired, natural circulation, single reheat and balanced draft coal-fired boiler forms part of a 1050-MW conventional power plant located in Spain. We start with a diagram of the power plant, followed by a formulation of the exergy cost allocation problem to determine the exergy cost of the product of the boiler as a whole and the expenses of the individual components and energy streams. We also define a productive structure of the system. Furthermore, a proposal for including the exergy of radiation is provided in this study. Our results show that the unit exergy cost of the product of the boiler goes from 2.352 to 2.5, and that the maximum values are located in the ancillary electrical devices, such as induced-draft fans and coil heaters. Finally, radiation does not have an effect on the electricity cost, but affects at least 30% of the unit exergy cost of the boiler's product.

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“…Exergy analyses have been applied to the physical resource use of countries including forestry, agriculture and industrial processes [3][4][5][6][7][8][9][10][11][12][13][14][15]. Exergy flow diagrams are used to analyze the main conversions of energy and material resources in a society, from the resource base to final consumption.…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of the Supply of Energy and Material Resources in the Swedish Society

Gong

Wall²

2016

Energies

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Abstract:Exergy is applied to the Swedish energy supply system for the period 1970-2013. Exergy flow diagrams for the systems of electricity and district heating as well as for the total supply system of energy and material resources for 2012 are presented. The share of renewable use has increased in both electricity and district heat production. The resource use is discussed in four sectors: residential and service, transportation, industry and agriculture. The resource use is also analyzed with respect to exergy efficiency and renewable share. The total exergy input of energy and material resources amounts to about 2700 PJ of which about 530 PJ was used for final consumption in 2012. The results are also compared with similar studies. Even though the share of renewable resource use has increased from 42% in 1980 to 47% in 2012, poor efficiency is still occurring in transportation, space heating, and food production. A strong dependence on fossil and nuclear fuels also implies a serious lack of sustainability. A more exergy efficient technology and a higher renewable energy share are needed in order to become a more sustainable society.

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Application of advanced thermodynamics, thermoeconomics and exergy costing to a Multiple Effect Distillation plant: In-depth analysis of cost formation process

Cited by 65 publications

References 28 publications

Thermoeconomic Coherence: A Methodology for the Analysis and Optimisation of Thermal Systems

Thermoeconomic Coherence: A Methodology for the Analysis and Optimisation of Thermal Systems

Assessing the Exergy Costs of a 332-MW Pulverized Coal-Fired Boiler

Exergy Analysis of the Supply of Energy and Material Resources in the Swedish Society

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