- Title
- Development of novel composite PCM for thermal energy storage using CaCl₂·6H₂O with graphene oxide and SrCl₂·6H₂O
- Creator
- Xu, Xiaoxiao; Cui, Hongzhi; Memon, Shazim Ali; Yang, Haibin; Tang, Waiching
- Relation
- Energy and Buildings Vol. 156, p. 163-172
- Publisher Link
- http://dx.doi.org/10.1016/j.enbuild.2017.09.081
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2017
- Description
- The inorganic salt hydrate PCM, CaCl₂·6H₂O, has a promising potential for thermal energy storage. However, this salt hydrate has tremendous issues of supercooling (the supercooling degree was 25.5°C as found in this research) which restricts its utilization in practical applications. The present study aimed to reduce the supercooling degree of CaCl₂·6H₂O through the innovative use of hydrophilic graphene oxide (GO) nano-sheets and SrCl₂·6H₂O as nucleating agents. The percentages of these nucleating agents in PCM were 0.005, 0.01, 0.02, 0.05 and 0.08 wt% for GO and 0.2, 0.5 and 0.8 wt% for SrCl₂·6H₂O, respectively. Based on the synergistic/additive effects, a novel composite PCM based on CaCl₂·6H₂O, GO and SrCl₂·6H₂O was proposed and developed. The test results showed that the composite PCM containing 0.02 wt% GO nano-sheets and 0.8 wt% SrCl₂·6H₂O effectively lowered the supercooling degree of CaCl₂·6H₂O from 25.5°C to as low as 0.2°C (approximately 99.2% supercooling degree of CaCl₂·6H₂O was reduced). To the best of authors' knowledge, it was the first time that the combination of GO and SrCl₂·6H₂O was found effective in reducing supercooling degree of CaCl₂·6H₂O. Moreover, 99.2% supercooling reduction of CaCl₂·6H₂O is considered the best achievement so far when compared to other studies related to supercooling reduction of CaCl₂·6H₂O. Finally, the solidification enthalpy of the composite PCMs was found to be as high as 207.90 J/g. Therefore, the developed composite PCM is an excellent candidate for thermal energy storage applications in buildings.
- Subject
- phase change materials; supercooling; graphene oxide; calcium chloride hexahydrate; strontium chloride hexahydrate; thermal energy storage
- Identifier
- http://hdl.handle.net/1959.13/1385768
- Identifier
- uon:32290
- Identifier
- ISSN:0378-7788
- Language
- eng
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