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Coupled heat transfer analysis of U-type tube module of LNG ambient air vaporizer under dry conditions

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  • Liu, Shanshan
  • Jiao, Wenling
  • Wang, Chunhua

Abstract

Liquefied natural gas (LNG) ambient air vaporizer (AAV) utilizes renewable aerothermal energy from ambient air to regasify LNG, which is usually chosen as the first choice in gas stations. Its gasification efficiency depends on the heat transfer performance of U-type finned tube which is composed of multiple straight finned tubes connected in series by U-bends. This paper developed a two-way coupled heat transfer model of AAV U-type module considering the conjugated interaction between different fluid domains and the phase interactions during the vaporization process of LNG. Experiments were conducted to validate the numerical model, and the results are in good agreement. The coupled heat transfer analysis indicates that mutually interference of the heat transfer process between two adjacent finned tubes in a U-type tube module occurs and gets more obvious as closer to the entrance of LNG. The heat flux of the inner tube surface decreases along the flow direction of LNG on the whole, yet there exists an obvious drop on the inner surface of the U-bend due to lack of fins. Besides, the heat transfer performance of the vertical straight finned tube is superior to U-type tube, and the difference is more obvious with higher LNG velocity.

Suggested Citation

  • Liu, Shanshan & Jiao, Wenling & Wang, Chunhua, 2024. "Coupled heat transfer analysis of U-type tube module of LNG ambient air vaporizer under dry conditions," Renewable Energy, Elsevier, vol. 221(C).
    • Handle: RePEc:eee:renene:v:221:y:2024:i:c:s0960148123016737
    DOI: 10.1016/j.renene.2023.119758
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    References listed on IDEAS

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    1. Cundapí, Roger & Moya, Sara L. & Valenzuela, Loreto, 2017. "Approaches to modelling a solar field for direct generation of industrial steam," Renewable Energy, Elsevier, vol. 103(C), pages 666-681.
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    3. 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.
    4. Stanek, Wojciech & Simla, Tomasz & Rutczyk, Bartłomiej & Kabaj, Adam & Buliński, Zbigniew & Szczygieł, Ireneusz & Czarnowska, Lucyna & Krysiński, Tomasz & Gładysz, Paweł, 2019. "Thermo-ecological assessment of Stirling engine with regenerator fed with cryogenic exergy of liquid natural gas (LNG)," Energy, Elsevier, vol. 185(C), pages 1045-1053.
    Full references (including those not matched with items on IDEAS)

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