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On the study of a thermal system for continuous cold energy harvesting and supply from LNG regasification

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  • Soh, Alex
  • Huang, Zhifeng
  • Shao, Yunlin
  • Islam, M.R.
  • Chua, K.J.

Abstract

Direct methods of cold recovery are often overlooked for LNG regasification due to exergy losses that occur in such processes. Low-temperature thermal energy storage (TES) systems are one such method of addressing this limitation. A dual-bed latent TES (LTES) system is proposed in this study to integrate the batch-wise behaviour of TES systems harnessing the constant cold supply process of LNG regasification. Comprehensive experimental testing of a single LTES unit with liquid nitrogen regasification is first carried out to establish its transient performance. Experimental conditions were able to realise a steady-state exergy efficiency of 21.6% with complete regasification. The LTES is then computationally modelled and validated with experimental data, before being implemented in a dual-bed LTES system model. The system is tested for scaling factors between 0.25 and 4 at 3 separate switching intervals and levels of LNG demand. Discharge efficiency of the LTES decreased at higher scaling factors while the overall consistency of regasification improved. Lastly, an optimization exercise is conducted to maximise the exergy efficiency and minimise payback period. High levels of LNG demand found minimum payback periods of 5 years under optimized conditions while lower levels of LNG demand convey a payback period of between 1.5 and 2 years.

Suggested Citation

  • Soh, Alex & Huang, Zhifeng & Shao, Yunlin & Islam, M.R. & Chua, K.J., 2023. "On the study of a thermal system for continuous cold energy harvesting and supply from LNG regasification," Energy, Elsevier, vol. 275(C).
    • Handle: RePEc:eee:energy:v:275:y:2023:i:c:s0360544223007818
    DOI: 10.1016/j.energy.2023.127387
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    References listed on IDEAS

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