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Methods for improving heat exchanger area distribution and storage temperature selection in heat recovery loops

Author

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  • Walmsley, Michael R.W.
  • Walmsley, Timothy G.
  • Atkins, Martin J.
  • Neale, James R.

Abstract

Inter-plant Heat Integration across a large site can be achieved using a HRL (Heat Recovery Loop). In this paper the interrelationship between HRL storage temperatures, heat recovery and total HRL exchanger area is investigated. A methodology for designing a HRL based on a ΔTmin approach is compared to three programming optimisation approaches where heat exchangers are constrained to have the same NTU (Number of Heat Transfer Units), LMTD (Log-Mean Temperature Difference) or to find the absolute MTA (Minimum Total Area) for a given heat recovery level. Analysis is performed using time-averaged and transient mass flow rate data and temperature data. The actual temperature driving force of the HRL heat exchangers is compared to the apparent driving force as indicated by the Composite Curves. Results for the same heat recovery level show that the ΔTmin approach is effective at minimising total area to within 5% of the minimum area approach. Allocation of individual heat exchanger areas can vary widely depending on the optimisation method, the characteristics of the transient stream data and the differences in the approach and exit stream temperatures. Results suggest that using the ΔTmin method for selecting storage temperatures in combination with sizing exchangers based on the time average CP values (for while the process is running) gives a near optimal solution without requiring lots of data input or computing resources.

Suggested Citation

  • Walmsley, Michael R.W. & Walmsley, Timothy G. & Atkins, Martin J. & Neale, James R., 2013. "Methods for improving heat exchanger area distribution and storage temperature selection in heat recovery loops," Energy, Elsevier, vol. 55(C), pages 15-22.
    • Handle: RePEc:eee:energy:v:55:y:2013:i:c:p:15-22
    DOI: 10.1016/j.energy.2013.02.050
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    Citations

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    Cited by:

    1. Baniassadi, Amir & Momen, Mahyar & Amidpour, Majid, 2015. "A new method for optimization of Solar Heat Integration and solar fraction targeting in low temperature process industries," Energy, Elsevier, vol. 90(P2), pages 1674-1681.
    2. Guo, Xiaofeng & Fan, Yilin & Luo, Lingai, 2014. "Multi-channel heat exchanger-reactor using arborescent distributors: A characterization study of fluid distribution, heat exchange performance and exothermic reaction," Energy, Elsevier, vol. 69(C), pages 728-741.
    3. Jalilinasrabady, Saeid & Palsson, Halldor & Saevarsdottir, Gudrun & Itoi, Ryuichi & Valdimarsson, Pall, 2013. "Experimental and CFD simulation of heat efficiency improvement in geothermal spas," Energy, Elsevier, vol. 56(C), pages 124-134.
    4. Bettina Muster‐Slawitsch & Christoph Brunner & Jürgen Fluch, 2014. "Application of an advanced pinch methodology for the food and drink production," Wiley Interdisciplinary Reviews: Energy and Environment, Wiley Blackwell, vol. 3(6), pages 561-574, November.
    5. Walmsley, Timothy G. & Walmsley, Michael R.W. & Atkins, Martin J. & Neale, James R., 2014. "Integration of industrial solar and gaseous waste heat into heat recovery loops using constant and variable temperature storage," Energy, Elsevier, vol. 75(C), pages 53-67.
    6. Tarighaleslami, Amir H. & Walmsley, Timothy G. & Atkins, Martin J. & Walmsley, Michael R.W. & Neale, James R., 2018. "Utility Exchanger Network synthesis for Total Site Heat Integration," Energy, Elsevier, vol. 153(C), pages 1000-1015.
    7. 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.
    8. Boldyryev, Stanislav & Varbanov, Petar Sabev, 2015. "Low potential heat utilization of bromine plant via integration on process and Total Site levels," Energy, Elsevier, vol. 90(P1), pages 47-55.
    9. Walmsley, Timothy G. & Walmsley, Michael R.W. & Tarighaleslami, Amir H. & Atkins, Martin J. & Neale, James R., 2015. "Integration options for solar thermal with low temperature industrial heat recovery loops," Energy, Elsevier, vol. 90(P1), pages 113-121.
    10. Wang, Yufei & Chang, Chenglin & Feng, Xiao, 2015. "A systematic framework for multi-plants Heat Integration combining Direct and Indirect Heat Integration methods," Energy, Elsevier, vol. 90(P1), pages 56-67.
    11. Diban, Pitchaimuthu & Foo, Dominic C.Y., 2019. "A pinch-based automated targeting technique for heating medium system," Energy, Elsevier, vol. 166(C), pages 193-212.

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