Effects of various carbon additives on the thermal storage performance of form-stable PCM integrated cementitious composites

Article

Ramakrishnan, Sayanthan, Wang, Xiaoming and Sanjayan, Jay. 2019. "Effects of various carbon additives on the thermal storage performance of form-stable PCM integrated cementitious composites." Applied Thermal Engineering. 148, pp. 491-501. https://doi.org/10.1016/j.applthermaleng.2018.11.025
Article Title

Effects of various carbon additives on the thermal storage performance of form-stable PCM integrated cementitious composites

ERA Journal ID3658
Article CategoryArticle
AuthorsRamakrishnan, Sayanthan, Wang, Xiaoming and Sanjayan, Jay
Journal TitleApplied Thermal Engineering
Journal Citation148, pp. 491-501
Number of Pages11
Year2019
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN1359-4311
1873-5606
Digital Object Identifier (DOI)https://doi.org/10.1016/j.applthermaleng.2018.11.025
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S1359431118324475
AbstractThis study focuses on further development of a novel paraffin/hydrophobic expanded perlite form-stable PCM composite to increase its heat transfer performance when used in cement-based composites. For this purpose, various high conductive carbon-based additives, such as graphite (G), carbon nanotubes (CNT) and graphene nanoplatelets (GNP), were integrated into form-stable PCM composite and their heat transfer enhancement was studied and compared. It was found that all additives have good chemical compatibility, high latent heat and significant enhancement in thermal conductivity of PCM composite. The use of 0.5 wt% of G, CNT and GNP led to the thermal conductivity enhancement of 45%, 30% and 49% respectively. Although G and GNP additives showed high thermal conductivity increment, heat transfer performance tests showed that GNP leads to highest performance enhancement and graphite the least. It was inferred that irrespective of the improvement in thermal conductivity, heat transfer performance of form-stable PCMs largely depends on the formation of the high conductive interconnecting network in the porous granules. The additives with the high specific surface area and smaller particle size than the pore diameter would be an excellent candidate to improve heat transfer performance of form-stable PCMs. TES performance of cementitious composites, as measured from prototype test cell experiments, revealed that the integration of G, CNT, and GNP into form-stable PCM enhanced the heat gain energy of interior walls by 78%, 122%, and 200% respectively.
KeywordsPhase change materials (PCMs); Heat transfer rate; Energy storage; Graphene nanoplatelets; Carbon nanotubes
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400505. Construction materials
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Byline AffiliationsSwinburne University of Technology
Monash University
Chinese Academy of Sciences, China
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