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Form-stable oxalic acid dihydrate/glycolic acid-based composite PCMs for thermal energy storage.
- Source :
-
Renewable Energy: An International Journal . Jun2019, Vol. 136, p657-663. 7p. - Publication Year :
- 2019
-
Abstract
- Abstract The development of high efficient materials for storage and utilization of sustainable thermal energy is very meaningful. Herein, in this research, an oxalic acid dihydrate/glycolic acid (OG) binary eutectic mixtures with the ratio of 80 wt%/20 wt% was prepared as phase change material (PCM), hydrothermal carbon (HTC) and poly (acrylamide-co-acrylic acid) copolymer (PAAAM) were separately and together used as support materials to solve liquid-state leakage problem and improve thermal conductivity. Three form-stable PCM composites (OG/PAAAM, OG/HTC/PAAAM and OG/HTC) were synthesized. The prepared composites were studied by XRD and FT-IR spectra, their thermophysical properties and PCM storage properties were investigated using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The OG/PAAAM, OG/HTC/PAAAM and OG/HTC showed the high loading rate to OG content, which are 1718 wt%, 1329 wt% and 1150 wt%, and the latent heat are 289.6, 313.2 and 318.8 J/g, respectively. In addition, the composites possess excellent recyclability after 101 times melting-freezing cycles. Compared to pure OG, OG/PAAAM and OG/HTC/PAAAM (0.2766, 0.3125 and 0.8538 W/m K), the OG/HTC exhibit a higher thermal conductivity of 1.3867 W/m K. Highlights • Three novel form-stable PCMs (OG/PAAAM, OG/HTC/PAAAM and OG/HTC) were prepared. • Three composites have high loading capacity on PCM and show excellent stability. • Composites doped with the HTC show higher heat storage efficiency. • Thermal conductivity has been significantly improved with the doping of HTC. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09601481
- Volume :
- 136
- Database :
- Academic Search Index
- Journal :
- Renewable Energy: An International Journal
- Publication Type :
- Academic Journal
- Accession number :
- 134797864
- Full Text :
- https://doi.org/10.1016/j.renene.2019.01.063