Preparation and properties of ternary nitrate-@silica microencapsulated phase change materials

doi:10.19799/j.cnki.2095-4239.2023.0621

Abstract

Abstract:

This study focuses on the development of a ternary salt-based microencapsulation phase change composite by the sol-gel approach. This composite exhibited a melting temperature range of 150-220 ℃ and could be effectively used for thermal energy storage. The thermophysical properties of the pure ternary nitrate salt were first evaluated. The salt exhibited a melting point of 156.04 ℃, latent heat of 95.5 kJ/kg, and decomposition temperature of 626.3 ℃. Then, the microencapsulated composite was fabricated and investigated based on the results of the pure ternary salt. Various characteristic methods, including scanning electron microscopy with energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, and differential scanning calorimetry, were employed to evaluate the thermal energy storage performance of the microencapsulated composite. The results indicated that the nitrate salt could be efficiently encapsulated by SiO₂. This resulted in a diameter of 10-40 μm of the composite, endowing it with a great ability to overcome liquid leakage. Meanwhile, the composite exhibited an encapsulation ratio of 90.9%, a latent heat of 86.81 kJ/kg, and a thermal energy utilization efficiency of 78.36%. The results presented in this study demonstrate that the microencapsulated composite achieves excellent thermal energy storage performance and can be an feasible candidate for low and medium thermal energy storage.

Key words: thermal energy storage, phase change materials, nitrates, microcapsules, low and medium temperatures

CLC Number:

TK 519

Tan SHUI, Yuting WU, Chuan LI, Qi LI. Preparation and properties of ternary nitrate-@silica microencapsulated phase change materials[J]. Energy Storage Science and Technology, 2023, 12(12): 3595-3604.

Figures/Tables 14

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Table 1

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材料	熔融点/℃	结晶点/℃	熔融焓/(kJ/kg)	结晶焓/(kJ/kg)
PCM	156.04	189.79	95.50	76.99
MEPCM	179.14	209.48	86.81	48.35

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