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Determination of Ambient Air Vaporizers’ Performance Based on a Study on Heat Transfer in Longitudinal Finned Tubes

Author

Listed:
  • Filip Lisowski

    (Department of Machine Design and Composite Structures, Faculty of Mechanical Engineering, Cracow University of Technology, al. Jana Pawła II 37, 31-864 Cracow, Poland)

  • Edward Lisowski

    (Department of Applied Informatics, Faculty of Mechanical Engineering, Cracow University of Technology, al. Jana Pawła II 37, 31-864 Cracow, Poland)

Abstract

Ambient air vaporizers (AVVs) are the most commonly used type of heat exchanger for cryogenic regasification stations. The transfer of heat from the environment for heating the liquefied gas and its vaporization is a cost-free and efficient method. Designing ambient air vaporizers for regasification or fueling stations requires accepting the size and related thermal power of the AVV considering the operating conditions and the type of liquefied gases to be vaporized. The nominal capacity of the ambient air vaporizer depends on its design, the frosting of longitudinal finned tubes, and the airflow through the vaporizer structure. This paper presents the results of experimental studies and computational fluid dynamics (CFD) analysis on determining the heat output of AVV longitudinal finned tubes depending on their design. This experiment was conducted in order to establish a numerical model. The relation between the longitudinal finned tubes thermal power and the air flow velocity is demonstrated and the beneficial effect of forced convection is proved. The obtained results are used for verification calculations of ambient air vaporizers’ performance depending on the size of the AVV, the profile cross-section, and the airflow velocity for different liquefied gases. Under conditions of forced convection, profiles with 12 equal-height fins were discovered to be the most efficient for higher airflow velocity providing up to 7% higher heat rate than profiles with 8 equal-height fins. However, at low air velocity, profiles with 8 equal-length fins showed a comparable heat output to profiles with 12 equal-length fins. Profiles with 8 and 12 unequal high fins differ in average heat output by about 28%. The profile with 12 unequal high fins turned out to be the least effective when 2D airflow was considered in this analysis.

Suggested Citation

  • Filip Lisowski & Edward Lisowski, 2024. "Determination of Ambient Air Vaporizers’ Performance Based on a Study on Heat Transfer in Longitudinal Finned Tubes," Energies, MDPI, vol. 17(14), pages 1-20, July.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:14:p:3579-:d:1439629
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    References listed on IDEAS

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    1. Liu, Shanshan & Jiao, Wenling & Wang, Haichao, 2016. "Three-dimensional numerical analysis of the coupled heat transfer performance of LNG ambient air vaporizer," Renewable Energy, Elsevier, vol. 87(P3), pages 1105-1112.
    2. Jadav, Chirag & Chowdhury, Kanchan, 2021. "Minimizing weight of ambient air vaporizer by using identical and different number of fins along the length," Renewable Energy, Elsevier, vol. 163(C), pages 398-413.
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