A Pareto aggregation approach for environmental-economic multi-objective optimization applied on a second-generation bioethanol production model
Multi-objective optimization is an important decision-making tool for energy processes, as multiple targets need to be achieved. These objectives are usually conflicting since a single solution cannot be optimal for all objectives, resulting in a set of Pareto-optimal solutions. Multiple indicators might be available to describe a sustainability objective, such as the environmental impact which is commonly evaluated by performing a life cycle assessment. In this study, Pareto aggregation is proposed as a method which employs a novel multi-objective optimization-based approach as an alternative to the classically used aggregation in life cycle assessment. This method identifies conflicting environmental indicators and performs an aggregation among those that require a trade-off. An environmental-economic optimization of a second-generation bioethanol plant is used to illustrate and evaluate the proposed method. Process parameters from a biochemical conversion pathway flowsheet simulation model are chosen as optimization variables. To reduce the computational time, surrogate models, based on artificial neural networks, are used. Out of the eighteen ReCiPe Midpoint environmental indicators, five were identified as conflicting, resulting in an aggregated environmental objective, which was then traded off with the economic objective function, chosen as the levelized cost of ethanol. Comparison with the widely used single-score EcoIndicator99 showed that the Pareto aggregation method can reduce most of the environmental indicators by up to 6.5%. This research provides an insight on non-redundant objective functions, aiming at reducing the dimensionality of multi-objective optimization problems, while taking into consideration decision-makers’ preferences.
Source (journal)
Energy conversion and management. - Oxford, 1980, currens
Oxford : 2024
0196-8904 [print]
1879-2227 [online]
303 (2024) , p. 1-11
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The author-created version that incorporates referee comments and is the accepted for publication version Available from 10.08.2024
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GOPRESUSE – Towards generic optimizations and prospective evaluations for the design of sustainable disruptive process technologies and resource management systems by connecting statistical entropy, economic and environmental aspects.
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Publications with a UAntwerp address
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Creation 11.02.2024
Last edited 13.02.2024
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