Abstract: Phase change materials (PCM) have been widely used in various fields such as building energy conservation, waste heat recovery and solar energy heat storage. Microencapsulation of phase change materials (PCM) has been a research hotspot in the fields of energy storage and utilization in recent years. The selection of encapsulation ratio of microcapsules needs to balance the energy storage efficiency and shell strength of the capsules. At present, there are few reports on high-temperature inorganic phase change microcapsules, and no study on NaNO3 microcapsules with controllable encapsulation ratio has been reported. In this work, the Taguchi experimental design method was adopted to prepare NaNO3@SiO2 microcapsules for high-temperature applications by the water-limited sol-gel method. Microcapsules with encapsulation ratios between 44.8% and 95.0% and encapsulation efficiencies between 39.0% and 92.9% were obtained. The effects of various factors on the encapsulation ratio of the capsules were revealed. By characterizing the thermal performance and thermal stability of the microcapsules, it was found that the energy storage performance of the microcapsules increased with encapsulation ratio increasing, while the thermal stability decreased with encapsulation ratio increasing. Therefore, microcapsules with appropriate encapsulation ratio should be prepared according to the requirements of practical applications.
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2022, Vol. 36 
