期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 184, 期 -, 页码 82-90出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2018.04.034
关键词
Phase change material; CNT; Thermal conductivity; Photo-thermal performance
资金
- Guangdong Natural Science Foundation [2015A030313653]
- Guangdong Province Science and Technology Plan Project [2017A010103047]
Phase change material is one of the most promising materials in thermal energy storage systems. In this work, a new phase change composite of Stearic Acid@Multi-walled carbon nanotubes (SA@MWCNTs) is prepared by a simple vacuum absorption method. The as-prepared composite is determined by scanning electronic microscope (SEM), Fourier transformation infrared spectroscope (FT-IR) and X-ray diffractometer (XRD). The results show that outside diameters of the PCM composite are about 50-60 nm and Stearic Acid is encapsulated in the MWCNTs without chemical reaction. The DSC results indicate that the melting temperature and latent heat of the composite are 59.28 degrees C and 91.94 J g(-1), respectively. The encapsulation ratio of Stearic Acid is calculated to be 47% from the results of the DSC measurements. The as-prepared SA@MWCNTs composite was dispersed into the water to form stable suspension, and the suspension shows remarkable photo-thermal conversion performance with temperature increases from 30 to 80 degrees C. The receiver efficiency of this new kind of heat transfer fluid maintain 85% in wide temperature range. Furthermore, the PCM composite could maintain its phase transition perfectly after 50 melting-freezing cycles, and no leakage of paraffin was observed by SEM. The high heat storage capability and excellent photo-thermal conversion performance of the composite enable it to be a potential material to store solar energy in practical applications.
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