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A zonal non-equilibrium approach to model temperature gradients during ventless bottom filling of pressurized cryotanks for natural gas-powered ships

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  • Thiaucourt, Jonas
  • Marty, Pierre
  • Hetet, Jean-François
  • Robert, Pascal
  • Delaire, Etienne

Abstract

Liquefied Natural Gas (LNG) as a fuel is seen as a solution to curb harmful emissions in shipping and its quick uptake is now significant. New LNG bunkering scenarios are hence rising with a growing range of technical challenges. In this paper, a thermodynamic zonal model is established to assess the temperature gradients induced by a ventless bottom filling. The reservoir is divided into three control volumes. A condensation model at the liquid/vapor interface is proposed. Thermophysical properties are interpolated in tables allowing calculations with a good precision and a CPU time reduced of 68% compared to equation of state software direct calls. The non-equilibrium phenomenon of condensation blocking is highlighted. Then, the impact of the loading pressure is further investigated. As a result, it is shown that bottom filling rate at high pressure (around 11 bars absolute) can compete with vented filling techniques only if the tank can deal with strong spatial (liquid/vapor) and temporal temperature gradients, respectively of order 94.3 K and 0.19 K/s.

Suggested Citation

  • Thiaucourt, Jonas & Marty, Pierre & Hetet, Jean-François & Robert, Pascal & Delaire, Etienne, 2019. "A zonal non-equilibrium approach to model temperature gradients during ventless bottom filling of pressurized cryotanks for natural gas-powered ships," Energy, Elsevier, vol. 188(C).
    • Handle: RePEc:eee:energy:v:188:y:2019:i:c:s036054421931727x
    DOI: 10.1016/j.energy.2019.116033
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    References listed on IDEAS

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    1. Yude Shao & Yoonhyeok Lee & Hokeun Kang, 2019. "Dynamic Optimization of Boil-Off Gas Generation for Different Time Limits in Liquid Natural Gas Bunkering," Energies, MDPI, vol. 12(6), pages 1-16, March.
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    Cited by:

    1. Kalikatzarakis, Miltiadis & Theotokatos, Gerasimos & Coraddu, Andrea & Sayan, Paul & Wong, Seng Yew, 2022. "Model based analysis of the boil-off gas management and control for LNG fuelled vessels," Energy, Elsevier, vol. 251(C).

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