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Open AccessArticle

Compounding MgCl2·6H2O with NH4Al(SO4)2·12H2O or KAl(SO4)2·12H2O to Obtain Binary Hydrated Salts as High-Performance Phase Change Materials

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Key Laboratory of Enhanced Heat Transfer and Energy Conservation, The Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
2
Guangdong Engineering Technology Research Center of Efficient Heat Storage and Application, South China University of Technology, Guangzhou 510640, China
*
Authors to whom correspondence should be addressed.
Molecules 2019, 24(2), 363; https://doi.org/10.3390/molecules24020363
Received: 21 December 2018 / Revised: 19 January 2019 / Accepted: 19 January 2019 / Published: 21 January 2019
(This article belongs to the Special Issue Phase Change Materials)
Developing phase change materials (PCMs) with suitable phase change temperatures and high latent heat is of great significance for accelerating the development of latent heat storage technology to be applied in solar water heating (SWH) systems. The phase change performances of two mixtures, NH4Al(SO4)2·12H2O-MgCl2·6H2O (mixture-A) and KAl(SO4)2·12H2O-MgCl2·6H2O (mixture-B), were investigated in this paper. Based on the DSC results, the optimum contents of MgCl2·6H2O in mixture-A and mixture-B were determined to be 30 wt%. It is found that the melting points of mixture-A (30 wt% MgCl2·6H2O) and mixture-B (30 wt% MgCl2·6H2O) are 64.15 °C and 60.15 °C, respectively, which are suitable for SWH systems. Moreover, two mixtures have high latent heat of up to 192.1 kJ/kg and 198.1 kJ/kg as well as exhibit little supercooling. After 200 cycles heating-cooling experiments, the deviations in melting point and melting enthalpy of mixture-A are only 1.51% and 1.20%, respectively. Furthermore, the XRD patterns before and after the cycling experiments show that mixture-A possesses good structure stability. These excellent thermal characteristics make mixture-A show great potential for SWH systems. View Full-Text
Keywords: latent heat storage; phase change material; magnesium chloride hexahydrate; aluminum ammonium sulfate dodecahydrate; aluminum potassium sulfate dodecahydrate latent heat storage; phase change material; magnesium chloride hexahydrate; aluminum ammonium sulfate dodecahydrate; aluminum potassium sulfate dodecahydrate
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MDPI and ACS Style

Sun, W.; Zhou, Y.; Feng, J.; Fang, X.; Ling, Z.; Zhang, Z. Compounding MgCl2·6H2O with NH4Al(SO4)2·12H2O or KAl(SO4)2·12H2O to Obtain Binary Hydrated Salts as High-Performance Phase Change Materials. Molecules 2019, 24, 363. https://doi.org/10.3390/molecules24020363

AMA Style

Sun W, Zhou Y, Feng J, Fang X, Ling Z, Zhang Z. Compounding MgCl2·6H2O with NH4Al(SO4)2·12H2O or KAl(SO4)2·12H2O to Obtain Binary Hydrated Salts as High-Performance Phase Change Materials. Molecules. 2019; 24(2):363. https://doi.org/10.3390/molecules24020363

Chicago/Turabian Style

Sun, Wanchun; Zhou, Yan; Feng, Jinxin; Fang, Xiaoming; Ling, Ziye; Zhang, Zhengguo. 2019. "Compounding MgCl2·6H2O with NH4Al(SO4)2·12H2O or KAl(SO4)2·12H2O to Obtain Binary Hydrated Salts as High-Performance Phase Change Materials" Molecules 24, no. 2: 363. https://doi.org/10.3390/molecules24020363

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