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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

Author

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  • Marcin Łęcki

    (Faculty of Mechanical Engineering, Institute of Turbomachinery, Lodz University of Technology, 219/223 Wolczanska Street, 90-924 Lodz, Poland)

  • Dariusz Andrzejewski

    (Faculty of Mechanical Engineering, Institute of Turbomachinery, Lodz University of Technology, 219/223 Wolczanska Street, 90-924 Lodz, Poland)

  • Artur N. Gutkowski

    (Faculty of Mechanical Engineering, Institute of Turbomachinery, Lodz University of Technology, 219/223 Wolczanska Street, 90-924 Lodz, Poland)

  • Grzegorz Górecki

    (Faculty of Mechanical Engineering, Institute of Turbomachinery, Lodz University of Technology, 219/223 Wolczanska Street, 90-924 Lodz, Poland)

Abstract

Plate fin-tube heat exchangers are widely used in air conditioning and refrigeration systems and other industry fields. Various errors made in the manufacturing process can result in the formation of an air gap between the tube and fin. Several numerical simulations were carried out for a symmetric section of plate fin-tube heat exchanger to study the influence of air gap on heat transfer under periodic flow conditions. Different locations and sizes of an air gap spanning 1/2 circumference of the tube were considered for the range of airflow velocities. Velocity and temperature fields for cases with air gap were compared with ideal thermal contact cases. Blocking of heat flow by the gap leads to the reduction of heat transfer rate. Fin discontinuity in the front of the tube causes the smallest reduction of the heat transfer rate in comparison to the ideal tube-fin contact, especially for thin slits. The rear gap position is the worst in the smallest gap range. Therefore, reversing the flow direction can lead to up to a 15% heat transfer increase, if mainly the rear gaps are present. The introduction of a thin slit in the front of the tube leads to convective heat transfer enhancement, which should be further investigated.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:13:p:3779-:d:580840
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    References listed on IDEAS

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    1. Lei Chai & Savvas A. Tassou, 2018. "A Review of Airside Heat Transfer Augmentation with Vortex Generators on Heat Transfer Surface," Energies, MDPI, vol. 11(10), pages 1-45, October.
    2. Lotfi, Babak & Sundén, Bengt & Wang, Qiuwang, 2016. "An investigation of the thermo-hydraulic performance of the smooth wavy fin-and-elliptical tube heat exchangers utilizing new type vortex generators," Applied Energy, Elsevier, vol. 162(C), pages 1282-1302.
    3. 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. Krzysztof Rajski & Jan Danielewicz, 2023. "Heat Transfer and Heat Recovery Systems," Energies, MDPI, vol. 16(7), pages 1-6, April.
    2. 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.
    3. Mirosław Neska & Mirosław Mrozek & Marta Żurek-Mortka & Andrzej Majcher, 2021. "Analysis of the Parameters of the Two-Sections Hot Side Heat Exchanger of the Module with Thermoelectric Generators," Energies, MDPI, vol. 14(16), pages 1-15, August.
    4. Wan-Ling Hu & Ai-Jun Ma & Yong Guan & Zhi-Jie Cui & Yi-Bo Zhang & Jing Wang, 2021. "Experimental Study of the Air Side Performance of Fin-and-Tube Heat Exchanger with Different Fin Material in Dehumidifying Conditions," Energies, MDPI, vol. 14(21), pages 1-15, October.

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