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Methodology for the evaluation of the flexibility of heat integration solutions in eco industrial parks

Abstract : One powerful way to improve energy efficiency in industry is through Heat Integration. The heat recovery application was extended from process level to multiple processes in eco-industrial parks offering important energy efficiency improvements. Many methodologies and tools have been developed to identify the potential heat recovery and the optimal heat transfer network design as heat integration solution at both scales. Nerveless, deviations of operating conditions such as supply and target temperatures and flow rates from nominal values are unavoidable, thus the operability issues are of vital importance to be considered in design methodologies and the flexibility assessment become an essential prerequisite of the heat transfer configuration in order to better take into account fluctuations and disturbances in the energy synergy networks. The present work propose an iterative two steps methodology based on two mathematical optimization models to prevent the inclusion of a large number of variability directly in one design formulation and leads progressively to a flexible design with a certain level of confidence in an efficient computation time. During the first step, a fixed topology is generated using multi period MILP model providing detailed solution on the recovery network, selection of heat exchangers areas and piping installation while considering a finite number of operating scenarios. Then a flexibility assessment NLP model is used to test the operational feasibility of the resulting fixed network for additional variations that occur at local and territorial scale while considering operational degrees of freedom to ensure feasible operation. The information provided is used to determine the critical points for flexibility to be added to the multi period design phase to find a new candidate network. Each model and the whole methodology are validated with case studies.
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Christina Kachacha. Methodology for the evaluation of the flexibility of heat integration solutions in eco industrial parks. Thermics [physics.class-ph]. Université Paris sciences et lettres, 2018. English. ⟨NNT : 2018PSLEM089⟩. ⟨tel-02479095⟩

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