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Jurnal Polimesin
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Polimesin mostly publishes studies in the core areas of mechanical engineering, such as energy conversion, machine and mechanism design, and manufacturing technology. As science and technology develop rapidly in combination with other disciplines such as electrical, Polimesin also adapts to new facts by accepting manuscripts in mechatronics. In Biomechanics, Mechanical study in musculoskeletal and bio-tissue has been widely recognized to help better life quality for disabled people and physical rehabilitation work. Such a wide range of Polimesin could be published, but it still has criteria to apply mechanical systems and principles. Exceeding the limitation has been a common reason for rejection by those outside the scope. Using chemical principles more than mechanical ones in material engineering has been a common reason for rejection after submission. Excessive exploration of the management within the discipline of Industrial Engineering in the manufacturing technology scope is also unacceptable. The sub-scope biomechanics that focuses on ergonomics and does not study movement involving applied force on the bio-tissue is also not suitable for submission.
Articles 611 Documents
CFD-based thermal limit prediction of LiFePO4 submarine battery modules using UDF heat generation and hybrid cooling Fajri Narotama; Prabowo Prabowo
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.9144

Abstract

This study investigates the transient thermal behavior of LiFePO4 battery modules in a diesel-electric submarine battery compartment under constant 1C and 1.4C discharge conditions. A three-dimensional CFD model was developed in ANSYS® Fluent, with conjugate heat transfer between the battery modules, the air domain, and the liquid cooling channels. Battery heat generation was calculated through a compiled User-Defined Function derived from an equivalent-circuit heat-generation formulation. The module was represented as a homogenized orthotropic solid, allowing the compartment-scale model to be solved without resolving each cell. The heat-source model was validated against published experimental data for a 100 Ah prismatic LFP cell, yielding an RMSE of 0.28°C and an MAE of 0.24°C. At 1C discharge, hybrid cooling reduced the final maximum temperature from 48.25 °C to 45.26°C, while both cooling configurations remained below the 50°C thermal cutoff. At 1.4C discharge, natural convection reached the cutoff at 2140 s, whereas hybrid cooling delayed it to 2403 s, extending the operating window by 263 s (12.3%). Although the reduction in final maximum temperature was limited, the average temperature decreased by 5.62°C. These results indicate that hybrid cooling mainly reduces global heat accumulation, while internal heat conduction remains the dominant factor governing local hotspot formation.