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Enhanced thermal conductivity of composite phase change materials based on carbon modified expanded perlite.
- Source :
-
Materials Chemistry & Physics . Mar2021, Vol. 261, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- Phase change materials (PCMs) have attracted growing attention in clean energy storage fields. To improve the thermal conductivity of porous mineral-based composite PCMs (c-PCMs), pretreatment via in-situ carbonization is proposed to fill the pore structure with thermally conductive carbon. After vacuum impregnation, high-performance c-PCMs are obtained, comprising carbon-modified expanded perlite (EPC) and polyethylene glycol (PEG). The modified micro-pores optimize the heat transfer characteristic behaviors in c-PCMs and improve the adsorption stability of PEG. Thus, the load capacity of PEG reaches approximately 73.90 wt% in EPC/PEG c-PCMs, providing excellent chemical and structural stability among perlite matrix, carbon modifier and PEG PCMs. The thermal conductivity of the EPC/PEG c-PCMs is 0.521 W/(m·K), which is almost 1.3 times that of the pristine PEG. These performances indicate that the EPC/PEG c-PCMs could be used as an environmentally friendly material for external wall heat-insulation application. • The micro-pores and carbon skeleton were developed in expanded perlite modified by sucrose after a carbonation process. • Low-cost, high thermal conductivity, shape-stable c-PCMs were composed of modified expanded perlite and polyethylene glycol. • The mass fraction of PEG in PEG/EPC c-PCMs was 73.90% approximately. • The as-prepared c-PCMs exhibited excellent thermal energy storage performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02540584
- Volume :
- 261
- Database :
- Academic Search Index
- Journal :
- Materials Chemistry & Physics
- Publication Type :
- Academic Journal
- Accession number :
- 148633264
- Full Text :
- https://doi.org/10.1016/j.matchemphys.2021.124226