Minimization of local impact of energy systems through exergy analysis

Cassetti, Gabriele; Colombo, Emanuela

doi:10.1016/j.enconman.2013.08.044

Cited by 20 publications

(11 citation statements)

References 10 publications

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“…The thermoeconomic costs of resources are taken from literature; indeed, for the raw oil a cost equal to 0.812 €/s is taken from [C. Sovrana, 2011], while for the compressor power a cost has been calculated as the product between the value of power and the electricity cost equal to 0.245 €/kWh, taken from [G. Cassetti et al, 2013]. Finally, for the heating fluid a cost per unit of mass equal to 0.0001 €/kg is taken from [E. Querol et al, 2012].…”

Section: Table 7-equipment Costsmentioning

confidence: 99%

“…Finally, the unit exergoeconomic cost of a stream represents the thermoeconomic cost required to get a unit of exergy and, hence, is simply given by the ratio between the thermoeconomic cost and the exergy content of the stream, expressed in €/kJ. Therefore, its minimization is of fundamental importance in the design optimization of any thermodynamic system [G. Cassetti et al, 2013]. In Table 15, the values of k* and c are calculated for the product streams only.…”

Section: Table 10-local Efficiency Of Each Piece Of Equipment Table 11-exergy Destroyed In Each Piece Of Equipmentmentioning

confidence: 99%

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A Hydrocarbon Production System Multi-Objective Optimization

Cascio

Maio

Bianco

et al. 2020

Day 3 Wed, January 15, 2020

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The benefits of a multi-objective optimization approach embedding an accurate exergy model of a hydrocarbon production system are shown on a real oil and gas facility. The innovative tool developed is based on a biogenetical differential evolution algorithm, which exploits a self-adaptive iterative procedure to maximize the value of the Asset. The optimization integrates the production system considering the trade-off between hydrocarbon production, energy consumption and efficiency. The Asset value optimization is one of the most complex and multi-disciplinary task in the oil and gas industry, due to the high number of objectives and their synergy. An integrated physical model of wells, gathering network and process plant is built and, then, used for exergy efficiency and gas production optimization. Conflicts and interactions among process variables and operational constraints are treated and solved holistically by the tailored evolutionary algorithm. This has also been integrated with a quick and efficient exergetic and thermoeconomic analysis in order to grant the achievement of the maximum asset value. The multi-objective optimization provides a trade-off between the optimal values of exergy efficiency and gas production that would have been obtained independently with single-objective optimizations. In fact, the exergy efficiency optimization is driven towards a configuration having lower irreversibilities: by apportioning the entire system exergy into the exergy destroyed by each piece of equipment and by calculating its local efficiency, the most contributing to irreversibility generation is identified. Moreover, the exergy analysis is complemented with an exergetic and a thermoeconomic cost analysis: the exergy analysis, apart from describing the quality of any thermodynamic process, does not give any information about the costs of each system stream, which can be even more interesting and of practical application. Indeed, the exergy analysis is proven to be an accurate way of assessing which equipment is performing worse. Therefore, it leads to preventive corrective actions to ensure good thermodynamic performance of the system and supports the decision process in the choice of maintenance operations. The thermoeconomic analysis, based on the theory of exergetic costs, confirms the improved management of the process plant and its efficiency enhancement, without neglecting the main target of the oil and gas industries that is production maximization. The benefits of a novel multi-objective biogenetical approach to solve and optimize a hydrocarbon production system in terms of exergy efficiency and gas production are shown, with respect not only to other methodologies of literature but also in terms of exergetic and thermoeconomic costs of the solutions provided, allowing to achieve the highest value of the operated asset.

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Section: Table 7-equipment Costsmentioning

confidence: 99%

Section: Table 10-local Efficiency Of Each Piece Of Equipment Table 11-exergy Destroyed In Each Piece Of Equipmentmentioning

confidence: 99%

A Hydrocarbon Production System Multi-Objective Optimization

Cascio

Maio

Bianco

et al. 2020

Day 3 Wed, January 15, 2020

View full text Add to dashboard Cite

show abstract

“…There have also been reported approaches to reduce the environmental impact and analyses based on features of technologies using hydrogen for power generation . Also, risk analysis combined with an exergy approach for local energy plants has been presented . However, the inherently safer design remains a pending task in this area .…”

Section: Introductionmentioning

confidence: 99%

“…29 Also, risk analysis combined with an exergy approach for local energy plants has been presented. 30 However, the inherently safer design remains a pending task in this area. 31 This design factor is especially important in developing countries (like Mexico), where the fuel distribution to end users is via storage systems for on-site consumption.…”

Section: ■ Introductionmentioning

confidence: 99%

Optimal Design of Inherently Safer Domestic Combined Heat and Power Systems

Fuentes-Cortés

Martinez-Gomez

Ponce-Ortega

2015

ACS Sustainable Chem. Eng.

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The residential co-generation system is a promising strategy to satisfy the electricity and hot water demands in residential complexes. This is an attractive option from both economic and environmental points of view; however, the associated risk has not been accounted for. It is very important to consider the risk associated with residential co-generation systems because the involved units use volatile fuels such as natural gas or liquefied petroleum gas. Therefore, this paper presents an optimization approach for designing residential co-generation systems through a multi-objective optimization formulation that simultaneously accounts for minimizing the total annual cost and the environmental impact as well as the associated risk to satisfy the electricity and hot water demands in a residential complex. The proposed model incorporates the optimal selection for the technologies used as well as the operation. A case study for a residential complex in Mexico is presented to show the applicability of the proposed approach, where it was shown to be possible to obtain attractive solutions from economic, environmental, and safety points of view.

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“…Beside cost accounting and cost allocation purposes, one of the main goals of thermoeconomics is the evaluation of the cost structure of the system products by understanding the cost formation process and thus introducing criteria and indicators for system design evaluation and optimization [36,37]. More specifically, the cost structure of system products allows for the understanding and quantification of the role that thermodynamic irreversibilities have in generating such costs [25,38,39]. The total exergy consumption of the CCPP is about one half of the exergy destructions of the other two systems.…”

Section: Thermoeconomic Analysismentioning

confidence: 99%

Exergy and Thermoeconomic Analyses of Central Receiver Concentrated Solar Plants Using Air as Heat Transfer Fluid

2016

Self Cite

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Abstract:The latest developments in solar technologies demonstrated that the solar central receiver configuration is the most promising application among concentrated solar power (CSP) plants. In CSPs solar-heated air can be used as the working fluid in a Brayton thermal cycle and as the heat transfer fluid for a Rankine thermal cycle as an alternative to more traditional working fluids thereby reducing maintenance operations and providing the power section with a higher degree of flexibility To supply thermal needs when the solar source is unavailable, an auxiliary burner is requested. This configuration is adopted in the Julich CSP (J-CSP) plant, operating in Germany and characterized by a nominal power of 1.5 MW, the heat transfer fluid (HTF) is air which is heated in the solar tower and used to produce steam for the bottoming Rankine cycle. In this paper, the J-CSP plant with thermal energy storage has been compared with a hybrid CSP plant (H-CSP) using air as the working fluid. Thermodynamic and economic performances of all the simulated plants have been evaluated by applying both exergy analysis and thermoeconomic analysis (TA) to determine the yearly average operation at nominal conditions. The exergy destructions and structure as well as the exergoeconomic costs of products have been derived for all the components of the plants. Based on the obtained results, the thermoeconomic design evaluation and optimization of the plants has been performed, allowing for improvement of the thermodynamic and economic efficiency of the systems as well as decreasing the exergy and exergoeconomic cost of their products.

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Minimization of local impact of energy systems through exergy analysis

Cited by 20 publications

References 10 publications

A Hydrocarbon Production System Multi-Objective Optimization

A Hydrocarbon Production System Multi-Objective Optimization

Optimal Design of Inherently Safer Domestic Combined Heat and Power Systems

Exergy and Thermoeconomic Analyses of Central Receiver Concentrated Solar Plants Using Air as Heat Transfer Fluid

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