A Novel Composite Phase-Change Material: CaCl2·6H2O + MgCl2·6H2O + NH4Cl
Ouyang Dong A B C , Zhihong Zhang B C D , Zhenhai Fu B C and Xiang Li B CA College of Chemistry and Chemical Engineering, Central South University, Changsha 410084, China.
B Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China.
C Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China.
D Corresponding author. Email: zhangzh@isl.ac.cn
Australian Journal of Chemistry 71(6) 416-421 https://doi.org/10.1071/CH18066
Submitted: 7 February 2018 Accepted: 3 April 2018 Published: 27 April 2018
Abstract
A new phase-change material (PCM) CaCl2·6H2O + MgCl2·6H2O + NH4Cl was investigated in this paper. MgCl2·6H2O and NH4Cl were mixed with CaCl2·6H2O to obtain CaCl2·6H2O as a eutectic hydrate salt. The results show that the eutectic composition of the PCM is as follows: 90 wt- % CaCl2·6H2O, 6.25 wt- % MgCl2·6H2O and 3.75 wt- % NH4Cl; the undercooling degree is less than 1.5°C when the nucleating agent is 2 wt- % SrCl2·6H2O or 1.5 wt- % Ba(OH)2·8H2O. The phase-change temperature and latent heat are respectively 25.3°C and 144.3 J g−1 when the composition is 90 wt- % CaCl2·6H2O, 6.25 wt- % MgCl2·6H2O, 3.75 wt- %, NH4Cl, with 2 wt- % SrCl2·6H2O as nucleating agent, and 2 wt- % carboxymethyl cellulose as thickener. In addition, when the composition is changed to 90 wt- % CaCl2·6H2O, 6.25 wt- % MgCl2·6H2O, 3.75 wt- % NH4Cl, 1.5 wt- % Ba(OH)2·8H2O and 2 wt- % carboxymethyl cellulose, the phase change temperature and latent heat are 25.2°C and 139.3 J g−1, respectively.
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