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ISBN: 978-1-56700-537-0

ISBN Online: 978-1-56700-538-7

ISSN Online: 2377-424X

International Heat Transfer Conference 17
August, 14-18, 2023, Cape Town, South Africa

HEAT TRANSFER ENHANCEMENT OF CERAMIC FOAM FOR MOLTEN SALT-BASED PHASE CHANGE MATERIAL

Get access (open in a dialog) DOI: 10.1615/IHTC17.210-280
10 pages

Sinopsis

Heat transfer enhancement is very important for improving the energy storage efficiency of phase change materials. Ceramic foam is a promising thermal enhancer for molten salt-based phase change materials. The phase change heat transfer characteristics of ceramic foam-enhanced molten salt are summarized in this paper to provide an overview of the performance of ceramic foam for potential applications. Both the melting and solidification processes are included and two typical configurations (the cavity and the shell-and-tube unit) are considered. The melting front is curved in the initial stage due to natural convection. Heat conduction is always the major heat transfer mechanism for ceramic foam-enhanced molten salt. By contrast, heat conduction is the major heat transfer mechanism for pure molten salt in the initial stage, while natural convection becomes the major heat transfer mechanism after 4000s. The melting rate is increased by 41.3%. In the shell-and-tube heat storage unit, the effect of the position of the ceramic foam is significant in the melting process while it is insignificant in the solidification process. The lower-inserted ceramic foam is superior in the melting process. The complete melting time is 20% shorter than the upper foam-inserted unit. However, in the solidification process, the upper-inserted ceramic foam is slightly superior. Overall, ceramic foam is a suitable thermal enhancer for molten salt-based phase change materials due to its excellent corrosion resistance and low cost, though it has a less remarkable heat transfer enhancement performance than metal foam.