Abstract
Energy piles-A fairly new renewable energy concept-Use a ground heat exchanger (GHE) in the foundation piles to supply heating and cooling loads to the supported building. Applying phase change materials (PCMs) to piles can help in maintaining a stable temperature within the piles and can then influence the axial load acting on the piles. In this study, two kinds of carbon-based composite PCMs (expanded graphite-based PCM and graphite nanoplatelet-based PCM) were prepared by vacuum impregnation for potential application in energy piles. Thereafter, a systematic study was performed and different characterization tests were carried out on two composite PCMs. The composite PCMs retained up to 93.1% of paraffin and were chemically compatible, thermally stable and reliable. The latent heat of the composite PCM was up to 152.8 J/g while the compressive strength of cement paste containing 10 wt % GNP-PCM was found to be 37 MPa. Hence, the developed composite PCM has potential for thermal energy storage applications.
| Original language | English |
|---|---|
| Article number | 391 |
| Journal | Materials |
| Volume | 10 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 7 2017 |
Funding
The work described in this paper was fully supported by grants from Natural Science Foundation of China (51678367), the Natural Science Foundation of China (51678369) and the Shenzhen Fundamental Research Funding (JCYJ20160422092836654).
Keywords
- Composite phase change materials
- Energy piles
- Energy storage
- Expanded graphite
- Graphite nanoplatelet
ASJC Scopus subject areas
- General Materials Science
