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• W2968574777 endingPage "2552" @default.
• W2968574777 startingPage "2552" @default.
• W2968574777 abstract "The phase change materials (PCMs) used in devices for thermal energy storage (TES) and management are often characterized by low thermal conductivity, a limit for their applicability. Composite PCMs (C-PCM), which combine active phase (proper PCM) with a passive phase with high conductivity and melting temperature have thus been proposed. The paper deals with the effect of length-scale on thermal characterization methods of C-PCM. The first part of the work includes a review of techniques proposed in the scientific literature. Up to now, special focus has been given to effective thermal conductivity and diffusivity at room or low temperature, at which both phases are solid. Conventional equipment has been used, neglecting length-scale effect in cases of coarse porous structures. An experimental set-up developed to characterize the thermal response of course porous C-PCMs also during active phase transition at high temperature is then presented. The setup, including high temperature-heat flux sensors and thermocouples to be located within samples, has been applied to evaluate the thermal response of some of the above C-PCMs. Experimental test results match Finite Elements (FE) simulations well, once a proper lattice model has been selected for the porous passive phase. FE simulations can then be used to estimate temperature difference between active and passive phase that prevents considering the C-PCM as a homogeneous material, to describe it by effective thermo-physical properties. In the engineering field, under these conditions, the design steps for TES systems design cannot be simplified by considering C-PCMs as homogeneous materials in FE codes." @default.
• W2968574777 created "2019-08-22" @default.
• W2968574777 creator A5024283251 @default.
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• W2968574777 date "2019-08-10" @default.
• W2968574777 modified "2023-10-16" @default.
• W2968574777 title "Methods to Characterize Effective Thermal Conductivity, Diffusivity and Thermal Response in Different Classes of Composite Phase Change Materials" @default.
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• W2968574777 doi "https://doi.org/10.3390/ma12162552" @default.
• W2968574777 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6720188" @default.
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