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Paraffin/expanded vermiculite composite phase change material as aggregate for developing lightweight thermal energy storage cement-based composites
Xu B.; Ma H.; Lu Z.; Li Z.
2015-12-15
Source PublicationApplied Energy
ISSN03062619
Volume160Pages:358-367
AbstractIn this study, a new paraffin/expanded vermiculite composite phase change material (PCM) was tailor-made as aggregate for developing lightweight thermal energy storage cement-based composites (LW-TESCCs). Vermiculite calcined at 800°C for 1h (EVM-800) can be considered as the optimum paraffin supporting matrix candidate, as it has the best expanded microstructure and crystallization. The composite PCM was fabricated at a paraffin-to-EVM-800 weight ratio of 0.6:1.0 by the vacuum impregnation method. The results of scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR) show that the paraffin can be well vacuum drawn into the expanded interlayer spaces of EVM-800, and that the paraffin and EVM-800 are chemically inert. The differential scanning calorimetry (DSC) results reveal that the composite PCM has an onset melting temperature of 27.0±0.1°C and latent heat of 77.6±4.3J/g, and good thermal stability is clearly suggested by the thermogravimetric analysis (TGA) results. Moreover, the LW-TESCCs with bulk densities below 1500kg/m were further developed by incorporating the composite PCM as sand replacement. It is found that the LW-TESCCs have significantly improved thermal resistance performance and well-endowed thermal storage capabilities. Thus, it can be expected that the potential applications of the LW-TESCCs in building envelopes would significantly contribute to reducing indoor air temperature fluctuations and in saving energy.
KeywordExpanded vermiculite Lightweight cement-based composite Paraffin Phase change material Thermal energy storage
DOI10.1016/j.apenergy.2015.09.069
URLView the original
Language英語
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Cited Times [WOS]:77   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
AffiliationHong Kong University of Science and Technology
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Xu B.,Ma H.,Lu Z.,et al. Paraffin/expanded vermiculite composite phase change material as aggregate for developing lightweight thermal energy storage cement-based composites[J]. Applied Energy,2015,160:358-367.
APA Xu B.,Ma H.,Lu Z.,&Li Z..(2015).Paraffin/expanded vermiculite composite phase change material as aggregate for developing lightweight thermal energy storage cement-based composites.Applied Energy,160,358-367.
MLA Xu B.,et al."Paraffin/expanded vermiculite composite phase change material as aggregate for developing lightweight thermal energy storage cement-based composites".Applied Energy 160(2015):358-367.
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