Development and validation of a real-time heat ingress model for LNG carrier cargo tanks

Joon Chae Lee and Min Soo Kim

Energy, 2025, vol. 333, issue C

Abstract: In LNG carriers, estimating real-time heat ingress is essential for optimizing the operation of the gas management system, which in turn improves energy efficiency. However, existing methods for calculating heat ingress have limitations, such as the inability to account for re-liquefaction systems, the restriction to average-value calculations, and the difficulty in evaluating heat ingress for individual tanks. This study proposes a new simulation model to estimate the real-time heat ingress into each tank of an actual LNG vessel with a re-liquefaction system. The proposed method was demonstrated to be an accurate and precise alternative to conventional approaches. Furthermore, trend analyses were conducted to investigate the correlation between real-time heat ingress and external environmental factors. These findings contribute to the optimized operation of the gas management system, to effective insulation monitoring for each tank, and to building a dataset for predicting heat ingress during the voyage. Moreover, this study has potential applications in the transportation of other liquefied cargoes, such as ammonia and liquefied hydrogen.

Keywords: Real-time heat ingress; LNG carrier; Measured operational data; Re-liquefaction system; Tank-level heat ingress estimation; Boil-off gas (BOG) (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:333:y:2025:i:c:s0360544225028506

DOI: 10.1016/j.energy.2025.137208

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