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Work-heat exchanger network synthesis (WHENS)

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  • Huang, Kefeng
  • Karimi, I.A.

Abstract

Research on heat integration has made significant advances in reducing utility consumption in chemical plants. However, the idea of work exchange between high and low-pressure process streams to reduce the consumption of the relatively expensive electricity has received limited attention. In this article, we present a more efficient mixed-integer nonlinear programming (MINLP) formulation to synthesize work-heat exchanger networks (WHENs). We propose a superstructure that explicitly considers constant-pressure streams for heat integration and enables an optimized selection of end-heaters and end-coolers to meet the desired temperature targets. Using a few examples, we demonstrate that simultaneous integration of work and heat in a chemical plant can offer significant savings in total annualized cost. In a case study from the literature, our approach yields a network with 3.1% lower total annualized cost, 10.6% more work exchange, and 81.0% more heat exchange than the best solution obtained from the existing literature approach. Furthermore, our approach successfully solves two case studies that previous literature approaches fail to solve.

Suggested Citation

  • Huang, Kefeng & Karimi, I.A., 2016. "Work-heat exchanger network synthesis (WHENS)," Energy, Elsevier, vol. 113(C), pages 1006-1017.
  • Handle: RePEc:eee:energy:v:113:y:2016:i:c:p:1006-1017
    DOI: 10.1016/j.energy.2016.07.124
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    References listed on IDEAS

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    1. Pavão, Leandro V. & Caballero, José A. & Ravagnani, Mauro A.S.S. & Costa, Caliane B.B., 2020. "A pinch-based method for defining pressure manipulation routes in work and heat exchange networks," Renewable and Sustainable Energy Reviews, Elsevier, vol. 131(C).
    2. Gao, Wei & Feng, Xiao, 2017. "The power target of a fluid machinery network in a circulating water system," Applied Energy, Elsevier, vol. 205(C), pages 847-854.
    3. 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.
    4. Hamsani, Muhammad Nurheilmi & Walmsley, Timothy Gordon & Liew, Peng Yen & Wan Alwi, Sharifah Rafidah, 2018. "Combined Pinch and exergy numerical analysis for low temperature heat exchanger network," Energy, Elsevier, vol. 153(C), pages 100-112.
    5. Santos, Lucas F. & Costa, Caliane B.B. & Caballero, José A. & Ravagnani, Mauro A.S.S., 2020. "Synthesis and optimization of work and heat exchange networks using an MINLP model with a reduced number of decision variables," Applied Energy, Elsevier, vol. 262(C).
    6. Zhang, Qiao & Yang, Sen & Feng, Xiao, 2021. "Thermodynamic principle based work exchanger network integration for cost-effective refinery hydrogen networks," Energy, Elsevier, vol. 230(C).
    7. Fu, Chao & Vikse, Matias & Gundersen, Truls, 2018. "Work and heat integration: An emerging research area," Energy, Elsevier, vol. 158(C), pages 796-806.

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