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Combined Pinch and exergy numerical analysis for low temperature heat exchanger network

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  • Hamsani, Muhammad Nurheilmi
  • Walmsley, Timothy Gordon
  • Liew, Peng Yen
  • Wan Alwi, Sharifah Rafidah

Abstract

To reduce the dependence on fossil fuel, Process Integration and energy efficiency are crucial in chemical process industry to minimise the consumption of fossil fuels and electricity demand through Heat Exchanger Network (HEN). Pinch Analysis is well established to optimal HEN design to maximize the energy recovery in a process. The stream matches for energy recovery in HEN is important to ensure the temperature potential is not wasted, which the temperature potential could be converted into mechanical work. Therefore, Exergy Analysis has been introduced to work with Pinch Analysis, which ensure the heat recovery stream matches with appropriate temperature differences to minimise the work potential (exergy) loss. This paper demonstrates how Pinch Analysis and Exergy Analysis is simultaneously applied to determine exergy targets (rejection, requirement and avoidable losses) in low temperature HEN. A novel numerical tool known as Exergy Problem Table Algorithm (Ex-PTA), is proposed in this paper as a numerical method to the conventional graphical representation in Extended Pinch Analysis and Design (ExPAnD) method. The proposed tool produces more realistic and achievable results. The net shaft work requirement of the refrigeration system is also determined together with the system COP. This paper explored the effect of setting heat exchangers' minimum approach temperature (ΔTmin) on the exergy targets for low temperature HEN design. The external utility requirement and unavoidable exergy losses increased with ΔTmin, while avoidable exergy losses and energy recovery reduced with respect to ΔTmin. The net power requirement of the system increased with the ΔTmin increment, however, the system COP reduced due to higher increment rate of compression compared to expansion work generation. The optimal ΔTmin was determined at 2 °C for heat recovery system in the case study based on super-targeting approach, which considers the total annualized cost, operating cost and capital cost.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:153:y:2018:i:c:p:100-112
    DOI: 10.1016/j.energy.2018.04.023
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    References listed on IDEAS

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    1. Liew, Peng Yen & Theo, Wai Lip & Wan Alwi, Sharifah Rafidah & Lim, Jeng Shiun & Abdul Manan, Zainuddin & Klemeš, Jiří Jaromír & Varbanov, Petar Sabev, 2017. "Total Site Heat Integration planning and design for industrial, urban and renewable systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 68(P2), pages 964-985.
    2. Huang, Kefeng & Karimi, I.A., 2016. "Work-heat exchanger network synthesis (WHENS)," Energy, Elsevier, vol. 113(C), pages 1006-1017.
    3. Tarighaleslami, Amir H. & Walmsley, Timothy G. & Atkins, Martin J. & Walmsley, Michael R.W. & Liew, Peng Yen & Neale, James R., 2017. "A Unified Total Site Heat Integration targeting method for isothermal and non-isothermal utilities," Energy, Elsevier, vol. 119(C), pages 10-25.
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    Cited by:

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    5. Klemeš, Jiří Jaromír & Varbanov, Petar Sabev & Walmsley, Timothy G. & Jia, Xuexiu, 2018. "New directions in the implementation of Pinch Methodology (PM)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 98(C), pages 439-468.
    6. Miguel Castro Oliveira & Muriel Iten & Henrique A. Matos, 2022. "Review on Water and Energy Integration in Process Industry: Water-Heat Nexus," Sustainability, MDPI, vol. 14(13), pages 1-24, June.
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    8. Orosz, Ákos & Kovács, Zoltán & Friedler, Ferenc, 2019. "Synthesis of heat integrated processing systems taking into account reliability," Energy, Elsevier, vol. 181(C), pages 214-225.

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