Thermal energy storage performance of hierarchical porous kaolinite geopolymer based shape-stabilized composite phase change materials |
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| Affiliation: | 1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, China;2. Department of Industrial Engineering, Università degli Studi di Padova, Padova, Italy;1. Anhui Engineering Research Center for High Efficiency Intelligent Photovoltaic Module, Chaohu University, Hefei, 238000, China;2. College of Mechanical Engineering, Chaohu University, Hefei, 238000, China;1. College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Rare-Earth Functional Materials and Devices Development, Baoji University of Arts and Sciences, Baoji, 721016, China;2. College of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, Baoji, 721013, China;3. School of Physics, Xidian University, Xi''an, 710071, China;1. School of Environmental and Chemical Engineering, Shenyang University of Technology, Shenyang, 110870, China;2. College of Material Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China;1. School of Mechanical Engineering, Henan University of Technology, Zhengzhou, 450001, PR China;2. School of Materials Science and Engineering, Henan University of Technology, Zhengzhou, 450001, PR China;3. State Key Laboratory of Power Metallurgy, Central South University, Changsha, 410083, PR China;4. Faculty of Engineering and Information Sciences, University of Wollongong, Northfields Avenue, Wollongong, NSW, 2522, Australia;5. State Key Lab of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan, 430070, China;1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Mengxi Road 2, Zhenjiang, Jiangsu Province, 212003, China;2. University of Coimbra, CEMMPRE, ARISE, Department of Mechanical Engineering, Rua Luís Reis Santos, 3030-788, Coimbra, Portugal;3. Key Laboratory of Materials Physic, Institute of Solid State Physics, Hefei Institute of Physical Sciences, Chinese Academy of Sciences, Hefei, 230031, China |
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| Abstract: | Phase change materials (PCMs) are prospective energy materials that are widely applied in building energy conservation, waste heat recovery, infrared stealth technology and solar dynamic power system. The enhancement of heat transfer and leak-proof performance are critical to PCMs. Although geopolymers have been applied in thermal energy storage, meanwhile, hierarchically porous geopolymers have already shown superb performance in various functional applications, to the authors’ knowledge, no report concerning the application of hierarchical porous ones have been issued. This paper concerns the preparation of a shape-stabilized composite PCMs, consisting of hierarchically porous kaolinite-based geopolymer (PKG) embedding polyethylene glycol 4000 (PEG4000), which shows promising prospects in thermal energy storage. Optimized porous geopolymer matrices feature high porosity (>83%), combined with high specific surface area (4.7 m2/g) and thermal conductivity (TC, 1.324 W·m?1·K?1). Furthermore, the shape-stabilized composite PCMs show excellent thermal energy storage properties: loading rate of 80.93 wt%, latent heat of 168.80 J g?1 and TC of ～0.36 W·m?1·K?1 at 20–30 °C, which is 1.64 times of the TC of pure PEG4000. Finally, the photothermal conversion performances of the shape-stabilized composite PCMs were also simulated. |
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| Keywords: | Building energy conservation Kaolinite Geopolymer Hierarchical porous structure Load rate |
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