Microencapsulated binary carbonate salt mixture in silica shell with enhanced effective heat capacity for high temperature latent heat storage
2019
Zhang, Hanfei | Shin, Donghyun | Santhanagopalan, Sunand
Microencapsulated phase change materials (MEPCM) with large active surface area can improve the system's effective heat capacity as a thermal storage medium. However, its usage in high temperature applications like concentrated solar power (CSP) has not yet been achieved due to the lack of a feasible microencapsulation method for high temperature compatible materials. This work reports novel process developed to achieve the first microencapsulation of a complex material system with high latent heat such like binary carbonate and its potential usage as a high temperature compatible thermal storage medium for CSP application. The MEPCM was demonstrated to be thermally stable up to 540 °C with a repeatable latent heat of 220 J/g. The MEPCM provides a 134.4% effective heat capacity enhancement for a temperature range from 400 °C to 540 °C compared to solar salt as a thermal storage medium. Finally, the proposed microencapsulation process was also shown to be applicable to other salt systems, showing its great potential for different application temperatures.
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