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Minerals 2018, 8(10), 440; https://doi.org/10.3390/min8100440

Mullite Stabilized Palmitic Acid as Phase Change Materials for Thermal Energy Storage

1
College of Gems and Materials Technology, Hebei GEO University, Shijiazhuang 050031, China
2
State Key Laboratory for Environment-Friendly Energy Materials, South West University of Science and Technology, Mianyang 621010, China
3
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, South West University of Science and Technology, Mianyang 621010, China
4
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China
*
Authors to whom correspondence should be addressed.
Received: 15 July 2018 / Revised: 24 September 2018 / Accepted: 1 October 2018 / Published: 10 October 2018
(This article belongs to the Special Issue Mineral Materials)
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Abstract

In this paper, mullite was adopted in order to absorb Palmitic Acid (PA) via a direct impregnation method. The prepared PA/mullite form-stable phase change materials (FSPCM) were systematically characterized by the Leakage Test (LT), Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Differential Scanning Calorimeter (DSC), Thermogravimetry (TG) and Cooling Curve Method (CCM). The results indicated that, among these composites with different mass fractions of PA, the sample with the 32 wt % Palmitic Acid has the best properties without any leakage. The enthalpy of 32%PA/68%mullite FSPCM is 50.8 J/g for melting process, and 58.3 J/g for solidifying process. The phase change point of 32%PA/68%mullite FSPCM is 64.1 °C for melting and 58.7 °C for solidifying. The heat storage efficiency of the PA/mullite FSPCM was enhanced considerably by adding mullite. The leakage and thermal properties of PA/mullite FSPCM were discussed and the performance of the FSPCM has been apparently improved. View Full-Text
Keywords: mullite; palmitic acid; form-stable phase change materials; indoor hot water mullite; palmitic acid; form-stable phase change materials; indoor hot water
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gu, X.; Liu, P.; Bian, L.; Peng, L.; Liu, Y.; He, H. Mullite Stabilized Palmitic Acid as Phase Change Materials for Thermal Energy Storage. Minerals 2018, 8, 440.

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