Formulation and phase change mechanism of Capric acid/Octadecanol binary composite phase change materials

نویسندگان

چکیده

Fatty acids and fatty alcohols have the advantages of high latent heat phase change, good thermal stability, no corrosion, supercooling separation. They can be used as change energy storage materials for passive temperature control. However, their popularization application are limited because transition narrow range. This study develops a novel binary composite (PCMs) Capric acid (CA) Octadecanol (OD) by melt blending method. The theoretical calculation hot melt-step cooling were carried out to generate an optimal molar ratio, followed DSC characterization. ATR-FTIR XRD performed determine transformation chemical structure changes. results showed CA-OD PCMs has fusion, melting Tm = 26.48 °C △H 181.06 J/g at mass ratio 85.15:14.86 (CA:OD), which is higher than theoretically predicted transition, indicating synergistic effect beneficial storage. Solid CA exists in form dimer –OH solid OD association, intermolecular hydrogen bonds weakens liquid. There PCMs, molecular changes before after similar that single component or OD. crystal structures two compounds also improved. Finally, through TG low cycle test, demonstrates stability practicability field building conservation.

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ژورنال

عنوان ژورنال: Energy

سال: 2023

ISSN: ['1873-6785', '0360-5442']

DOI: https://doi.org/10.1016/j.energy.2023.126943