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Thermal state-of-expansion or melting of phase change material based heatsink for underwater battery power system

Lookup NU author(s): Professor Cheng Chin


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This paper introduces a phase change material (PCM) based heat sink (PCMHS) to reduce the idle and operatingtemperature of a direct current (DC)/DC converter in an underwater battery power system. The developedmacro-encapsulated PCM enclosure features a dampening assembly that maximizes thermal contact and eliminatesvoid space catered for volumetric expansion of the PCM during melting. The operating temperature of theDC/DC converter at steady-state (both idle and full-load cycle condition) is estimated via a validated thermalmodel. A percentage improvement of at least 27% can be achieved by PCMHS at different load cycle conditionstested. The PCM's volume expansion of approximately 6.4% corresponds to the measured cover movement ofaround 3 mm. The relationship between the state of expansion (or melt state) to solid-state of the PCM is alsoestablished.

Publication metadata

Author(s): Chiew J, Chin CS, Toh WD, Gao Z, Jia J

Publication type: Article

Publication status: Published

Journal: Journal of Energy Storage

Year: 2019

Volume: 26

Pages: 1-13

Print publication date: 01/12/2019

Online publication date: 21/09/2019

Acceptance date: 15/09/2019

ISSN (electronic): 2352-152X

Publisher: Elsevier


DOI: 10.1016/j.est.2019.100956


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