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Thermal calculations of plate–fin–and-tube heat exchangers with different heat transfer coefficients on each tube row

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  • Taler, Dawid
  • Taler, Jan
  • Trojan, Marcin

Abstract

In finned tube heat exchangers, the first rows of tubes are most effective when the air velocity in front of the exchanger is less than about 3.5 m/s. The heat transfer coefficient (HTC) decreases with each subsequent row and stabilizes only from the fifth row onwards. The paper examines a two-pass double-row plate-fin and tube heat exchanger (PFTHE) made of circular or oval pipes. A method for determining the air side Nusselt number on individual pipe row was developed, using the results of CFD (Computational Fluid Dynamics) modelling of the heat exchanger. Also, a heat transfer correlation was found for the mean HTC for the whole PFTHE using CFD modelling. The correlations based on the results of CFD modelling match very well the empirical correlations based on experimental tests of two car radiators. The analysis shows that the first rows of PFTHE are the most effective in terms of thermal effectiveness. By building a heat exchanger with two rows of pipes, it is possible to reduce investment expenditures at the same thermal output significantly. Heating systems with PFTHE air heaters with fewer rows of pipes are characterized by lower fuel consumption due to their higher efficiency. The investment costs for automotive radiators can also be reduced. The introduction of PFTHE heat exchangers with fewer pipe rows has a positive impact on the environment. Both material expenditures on the construction of PFTHE, energy consumption by the air fan, and fuel consumption for heating purposes are reduced.

Suggested Citation

  • Taler, Dawid & Taler, Jan & Trojan, Marcin, 2020. "Thermal calculations of plate–fin–and-tube heat exchangers with different heat transfer coefficients on each tube row," Energy, Elsevier, vol. 203(C).
    • Handle: RePEc:eee:energy:v:203:y:2020:i:c:s0360544220309130
    DOI: 10.1016/j.energy.2020.117806
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    References listed on IDEAS

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    1. Halıcı, Fethi & Taymaz, İmdat & Gündüz, Mehmet, 2001. "The effect of the number of tube rows on heat, mass and momentum transfer in flat-plate finned tube heat exchangers," Energy, Elsevier, vol. 26(11), pages 963-972.
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    Cited by:

    1. Wojciech Judt, 2020. "Numerical and Experimental Analysis of Heat Transfer for Solid Fuels Combustion in Fixed Bed Conditions," Energies, MDPI, vol. 13(22), pages 1-18, November.
    2. Taler, Dawid & Taler, Jan & Wrona, Katarzyna, 2021. "New analytical-numerical method for modelling of tube cross-flow heat exchangers with complex flow systems," Energy, Elsevier, vol. 228(C).
    3. Mateusz Marcinkowski & Dawid Taler & Jan Taler & Katarzyna Węglarz, 2021. "Thermal Calculations of Four-Row Plate-Fin and Tube Heat Exchanger Taking into Account Different Air-Side Correlations on Individual Rows of Tubes for Low Reynold Numbers," Energies, MDPI, vol. 14(21), pages 1-13, October.
    4. Silvia Macchitella & Gianpiero Colangelo & Giuseppe Starace, 2023. "Performance Prediction of Plate-Finned Tube Heat Exchangers for Refrigeration: A Review on Modeling and Optimization Methods," Energies, MDPI, vol. 16(4), pages 1-30, February.
    5. Chang, Hongliang & Han, Zeran & Li, Xionghui & Ma, Ting & Wang, Qiuwang, 2022. "Experimental investigation on heat transfer performance based on average thermal-resistance ratio for supercritical carbon dioxide in asymmetric airfoil-fin printed circuit heat exchanger," Energy, Elsevier, vol. 254(PB).
    6. Mateusz Marcinkowski & Dawid Taler & Jan Taler & Katarzyna Węglarz, 2022. "Air-Side Nusselt Numbers and Friction Factor’s Individual Correlations of Finned Heat Exchangers," Energies, MDPI, vol. 15(15), pages 1-17, August.
    7. Dawid Taler & Jan Taler & Marcin Trojan, 2020. "Experimental Verification of an Analytical Mathematical Model of a Round or Oval Tube Two-Row Car Radiator," Energies, MDPI, vol. 13(13), pages 1-23, July.
    8. Węglarz, Katarzyna & Taler, Dawid & Taler, Jan, 2022. "New non-iterative method for computation of tubular cross-flow heat exchangers," Energy, Elsevier, vol. 260(C).
    9. Seferlis, Panos & Varbanov, Petar Sabev & Papadopoulos, Athanasios I. & Chin, Hon Huin & Klemeš, Jiří Jaromír, 2021. "Sustainable design, integration, and operation for energy high-performance process systems," Energy, Elsevier, vol. 224(C).
    10. Ko, Yun Mo & Song, Joo Young & Lee, Jae Won & Sohn, Sangho & Song, Chan Ho & Khoshvaght-Aliabadi, Morteza & Kim, Yongchan & Kang, Yong Tae, 2024. "A critical review on Colburn j-factor and f-factor and energy performance analysis for finned tube heat exchangers," Energy, Elsevier, vol. 287(C).

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