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Simultaneous Optimization of Work and Heat Exchange Networks

Author

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  • Nidret Ibrić

    (Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), Kolbjørn Hejes v 1B, NO-7034 Trondheim, Norway
    Faculty of Technology, University of Tuzla, Urfeta Vejzagića 8, 75000 Tuzla, Bosnia and Herzegovina)

  • Chao Fu

    (SINTEF Energy Research, Sem Sælands vei 11, NO-7034 Trondheim, Norway)

  • Truls Gundersen

    (Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), Kolbjørn Hejes v 1B, NO-7034 Trondheim, Norway)

Abstract

This paper introduces a simultaneous optimization approach to synthesizing work and heat exchange networks (WHENs). The proposed work and heat integration (WHI) superstructure enables different thermodynamic paths of pressure and temperature-changing streams. The superstructure is connected to a heat exchanger network (HEN) superstructure, enabling the heat integration of hot and cold streams identified within the WHI superstructure. A two-step solution strategy is proposed, consisting of initialization and design steps. In the first step, a thermodynamic path model based on the WHI superstructure is combined with a model for simultaneous optimization and heat integration. This nonlinear programming (NLP) model aims to minimize operating expenditures and provide an initial solution for the second optimization step. In addition, hot and cold streams are identified, enabling additional model reduction. In the second step of the proposed solution approach, a thermodynamic path model is combined with the modified HEN model to minimize the network’s total annualized cost (TAC). The proposed mixed integer nonlinear programming (MINLP) model is validated by several examples, exploring the impact of the equipment costing and annualization factor on the optimal network design. The results from these case studies clearly indicate that the new synthesis approach proposed in this paper produces solutions that are consistently similar to or better than the designs presented in the literature using other methodologies.

Suggested Citation

  • Nidret Ibrić & Chao Fu & Truls Gundersen, 2024. "Simultaneous Optimization of Work and Heat Exchange Networks," Energies, MDPI, vol. 17(7), pages 1-35, April.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:7:p:1753-:d:1370923
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    References listed on IDEAS

    as
    1. Onishi, Viviani C. & Quirante, Natalia & Ravagnani, Mauro A.S.S. & Caballero, José A., 2018. "Optimal synthesis of work and heat exchangers networks considering unclassified process streams at sub and above-ambient conditions," Applied Energy, Elsevier, vol. 224(C), pages 567-581.
    2. Fu, Chao & Vikse, Matias & Gundersen, Truls, 2018. "Work and heat integration: An emerging research area," Energy, Elsevier, vol. 158(C), pages 796-806.
    3. Huang, Kefeng & Karimi, I.A., 2016. "Work-heat exchanger network synthesis (WHENS)," Energy, Elsevier, vol. 113(C), pages 1006-1017.
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