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Numerical study of the effect of fouling on local heat transfer conditions in a high-temperature fin-and-tube heat exchanger

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  • Łopata, Stanisław
  • Ocłoń, Paweł

Abstract

The paper presents the numerical analysis of a flow around a bundle of externally finned elliptical tubes, used in cross-flow heat exchangers of a flue-gas/water type, arranged serially in two rows. An algorithm that enables determining the variations of flue-gas temperature and local heat transfer coefficient from gas to the tube wall was presented. On the basis of calculations, it was found that the intensity of heat transfer processes differs significantly in different rows. The intensity is higher in the first row and lower in the second one. This fact is confirmed by the values of the local heat transfer coefficients calculated for the case of heat transfer from gas to a wall determined at the same location. The coefficients, calculated for the first row of tubes, are higher compared with those of the second row. The appearance of fouling deposits on the tube's wall inner surface has an impact on the average temperature along the exhaust gas flow path. It also affects the local heat transfer coefficients from the gas-side to the tube walls. The presence of fouling increases the flue-gas temperature, while its influence on the heat transfer coefficient is slight.

Suggested Citation

  • Łopata, Stanisław & Ocłoń, Paweł, 2015. "Numerical study of the effect of fouling on local heat transfer conditions in a high-temperature fin-and-tube heat exchanger," Energy, Elsevier, vol. 92(P1), pages 100-116.
    • Handle: RePEc:eee:energy:v:92:y:2015:i:p1:p:100-116
    DOI: 10.1016/j.energy.2015.03.048
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    References listed on IDEAS

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    1. Lotfi, Babak & Zeng, Min & Sundén, Bengt & Wang, Qiuwang, 2014. "3D numerical investigation of flow and heat transfer characteristics in smooth wavy fin-and-elliptical tube heat exchangers using new type vortex generators," Energy, Elsevier, vol. 73(C), pages 233-257.
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    Cited by:

    1. Ocłoń, Paweł & Łopata, Stanisław & Stelmach, Tomasz & Li, Mingjie & Zhang, Jian-Fei & Mzad, Hocine & Tao, Wen-Quan, 2021. "Design optimization of a high-temperature fin-and-tube heat exchanger manifold – A case study," Energy, Elsevier, vol. 215(PB).
    2. Andrea De Lieto Vollaro & Giorgio Galli & Andrea Vallati, 2015. "CFD Analysis of Convective Heat Transfer Coefficient on External Surfaces of Buildings," Sustainability, MDPI, vol. 7(7), pages 1-12, July.
    3. Sadeghianjahromi, Ali & Wang, Chi-Chuan, 2021. "Heat transfer enhancement in fin-and-tube heat exchangers – A review on different mechanisms," Renewable and Sustainable Energy Reviews, Elsevier, vol. 137(C).
    4. Zima, Wiesław & Nowak-Ocłoń, Marzena & Ocłoń, Paweł, 2018. "Novel online simulation-ready models of conjugate heat transfer in combustion chamber waterwall tubes of supercritical power boilers," Energy, Elsevier, vol. 148(C), pages 809-823.
    5. Vazquez, Luis & Blanco, Jesús María & Ramis, Rolando & Peña, Francisco & Diaz, David, 2015. "Robust methodology for steady state measurements estimation based framework for a reliable long term thermal power plant operation performance monitoring," Energy, Elsevier, vol. 93(P1), pages 923-944.
    6. Zhang, Pan & Ma, Ting & Li, Wei-Dong & Ma, Guang-Yu & Wang, Qiu-Wang, 2018. "Design and optimization of a novel high temperature heat exchanger for waste heat cascade recovery from exhaust flue gases," Energy, Elsevier, vol. 160(C), pages 3-18.
    7. Shao, Suola & Zhang, Huan & Fan, Xianwang & You, Shijun & Wang, Yaran & Wei, Shen, 2021. "Thermodynamic and economic analysis of the air source heat pump system with direct-condensation radiant heating panel," Energy, Elsevier, vol. 225(C).
    8. Tian, Jiayang & Wang, Yufei & Feng, Xiao, 2016. "Simultaneous optimization of flow velocity and cleaning schedule for mitigating fouling in refinery heat exchanger networks," Energy, Elsevier, vol. 109(C), pages 1118-1129.

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