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Air-Side Nusselt Numbers and Friction Factor’s Individual Correlations of Finned Heat Exchangers

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 finned heat exchangers (FHE), the average value of the entire heat transfer coefficient (HTC) is considered. However, each row of the heat exchanger (HEX) has different hydraulic-thermal characteristics. The novelty of this research is to present the differentiation of the individual air-side Nusselt number and Darcy-Weisbach friction factor correlations in each row of FHE using CFD modelling. FHE has four-rows, circular tubes, and continuous fins with a staggered tube arrangement. Relationships for the Nusselt number and D-W friction factor derived for the entire exchanger based on CFD modelling were compared with those available in the literature, determined using experimental data. The maximum relative differences between the Nusselt number for a four-row FHE determined experimentally and by CFD modelling are in the range from 22% for a Reynolds number based on a tube outside diameter of 1000 to 30% for a Reynolds number of 13,000. The maximum relative differences between the D-W friction factor for a four-row FHE determined experimentally and by CFD modelling are in the range of 50% for a Reynolds number based on a tube outer diameter of 1000 to 10% for a Reynolds number of 13,000. The CFD modelling performed shows that in the range of Reynolds numbers based on hydraulic diameters from 150 to 1400, the Nusselt number for the first row in a four-row FHE is about 22% to 15% higher than the average Nusselt number for the entire exchanger. In the range of Reynolds number changes based on hydraulic diameter from 2800 to 6000, the Nusselt numbers on the first and second rows of tubes are close to each other. Correlations of Nusselt numbers and D-W friction factors derived for individual tube rows can be used in the design of plate-fin and tube heat exchangers used in equipment such as air-source heat pumps, automotive radiators, air-conditioning systems, and in air hot-liquid coolers. In particular, the correlations can be used to select the optimum number of tube rows in the exchanger.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:15:p:5630-:d:879177
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    References listed on IDEAS

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    1. 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).
    2. Du, Kun & Calautit, John & Eames, Philip & Wu, Yupeng, 2021. "A state-of-the-art review of the application of phase change materials (PCM) in Mobilized-Thermal Energy Storage (M-TES) for recovering low-temperature industrial waste heat (IWH) for distributed heat," Renewable Energy, Elsevier, vol. 168(C), pages 1040-1057.
    3. Xinguo Sun & Jasim M. Mahdi & Hayder I. Mohammed & Hasan Sh. Majdi & Wang Zixiong & Pouyan Talebizadehsardari, 2021. "Solidification Enhancement in a Triple-Tube Latent Heat Energy Storage System Using Twisted Fins," Energies, MDPI, vol. 14(21), pages 1-23, November.
    4. Davide Menegazzo & Giulia Lombardo & Sergio Bobbo & Michele De Carli & Laura Fedele, 2022. "State of the Art, Perspective and Obstacles of Ground-Source Heat Pump Technology in the European Building Sector: A Review," Energies, MDPI, vol. 15(7), pages 1-25, April.
    5. 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.
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    1. Aigul Zhanuzakovna Amrenova & Abay Mukhamediyarovich Dostiyarov & Iliya Krastev Iliev & Ayaulym Konysbekovna Yamanbekova & Rakhimzhan Kabievich Orumbayev & Dias Raybekovich Umyshev, 2023. "Experimental Investigation of Thermal-Hydraulic Performance of Externally Finned Tubes," Sustainability, MDPI, vol. 15(12), pages 1-25, June.

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