Simultaneous optimisation of large-scale problems of heat-integrated water networks

This work presents a simultaneous mixed-integer nonlinear programming (MINLP) optimisation model and an efficient iterative solution strategy that can be successfully applied to various heat-integrated water networks (HIWNs), including large-scale problems with a large number of water streams. These...

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Bibliographic Details
Published in:Energy (Oxford) 2021-11, Vol.235, p.121354, Article 121354
Main Authors: Ibrić, Nidret, Ahmetović, Elvis, Kravanja, Zdravko, Grossmann, Ignacio E.
Format: Article
Language:English
Subjects:
Combinatorial analysis
Convexity
Heat
Heat exchangers
Heat-integrated water networks
Iterative methods
Iterative solution
Iterative solution strategy
Large-scale problems
MINLP model
Mixed integer
Network synthesis
Nonlinear programming
Optimization
Simultaneous optimisation
Streams
Wastewater treatment
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Summary:This work presents a simultaneous mixed-integer nonlinear programming (MINLP) optimisation model and an efficient iterative solution strategy that can be successfully applied to various heat-integrated water networks (HIWNs), including large-scale problems with a large number of water streams. These problems are highly nonlinear, non-convex and combinatorial. To circumvent such difficulties, including network complexity as well as identifying the roles of water streams in the heat exchanger network (HEN) whether they are hot or cold, a modified convex hull formulation proposed by Ahmetović and Kravanja [1] is applied. The overall model combines the water network (WN), wastewater treatment network (WTN), heat integration (HI), and heat exchanger network synthesis (HENS) models. This model is iteratively solved in three steps including targeting and design steps. The proposed model and solution strategy are tested on large-scale problems. To the best of our knowledge, the results obtained for all the problems in this paper are better than those reported in the current literature. [Display omitted] •A modified superstructure of heat-integrated water networks (HIWNs) is proposed.•An mixed-integer nonlinear programming (MINLP) model is developed.•A three-step solution strategy combining targeting and design steps is applied.•Large-scale HIWN problems are solved and the improved results presented.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2021.121354