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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

Author

Listed:
  • Mateusz Marcinkowski

    (Faculty of Environmental Engineering and Energy, Cracow University of Technology, 31-155 Cracow, Poland)

  • Dawid Taler

    (Faculty of Environmental Engineering and Energy, Cracow University of Technology, 31-155 Cracow, Poland)

  • Jan Taler

    (Faculty of Environmental Engineering and Energy, Cracow University of Technology, 31-155 Cracow, Poland)

  • Katarzyna Węglarz

    (Faculty of Environmental Engineering and Energy, Cracow University of Technology, 31-155 Cracow, Poland)

Abstract

Currently, when designing plate-fin and tube heat exchangers, only the average value of the heat transfer coefficient (HTC) is considered. However, each row of the heat exchanger (HEX) has different hydraulic–thermal characteristics. When the air velocity upstream of the HEX is lower than approximately 3 m/s, the exchanged heat flow rates at the first rows of tubes are higher than the average value for the entire HEX. The heat flow rate transferred in the first rows of tubes can reach up to 65% of the heat output of the entire exchanger. This article presents the method of determination of the individual correlations for the air-side Nusselt numbers on each row of tubes for a four-row finned HEX with continuous flat fins and round tubes in a staggered tube layout. The method was built based on CFD modelling using the numerical model of the designed HEX. Mass average temperatures for each row were simulated for over a dozen different airflow velocities from 0.3 m/s to 2.5 m/s. The correlations for the air-side Nusselt number on individual rows of tubes were determined using the least-squares method with a 95% confidence interval. The obtained correlations for the air-side Nusselt number on individual rows of tubes will enable the selection of the optimum number of tube rows for a given heat output of the HEX. The investment costs of the HEX can be reduced by decreasing the tube row number. Moreover, the operating costs of the HEX can also be lowered, as the air pressure losses on the HEX will be lower, which in turn enables the reduction in the air fan power.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:6978-:d:663793
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    References listed on IDEAS

    as
    1. Mateusz Marcinkowski & Dawid Taler, 2021. "Calculating the Efficiency of Complex-Shaped Fins," Energies, MDPI, vol. 14(3), pages 1-14, January.
    2. 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).
    3. Marcin Łęcki & Dariusz Andrzejewski & Artur N. Gutkowski & Grzegorz Górecki, 2021. "Study of the Influence of the Lack of Contact in Plate and Fin and Tube Heat Exchanger on Heat Transfer Efficiency under Periodic Flow Conditions," Energies, MDPI, vol. 14(13), pages 1-25, June.
    4. 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.
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    Cited by:

    1. 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.
    2. Artur S. Bartosik, 2022. "Numerical Heat Transfer and Fluid Flow: A Review of Contributions to the Special Issue," Energies, MDPI, vol. 15(8), pages 1-8, April.

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