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Preparation and performance analysis of different types of shape-stable phase change particles for thermal energy storage system

Author

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  • Ji, Mengting
  • Lv, Laiquan
  • Zhou, Hao

Abstract

This study used the wet-state extrusion and sintering method to fabricate shape-stabilized phase change particles (SSPCMPs) with solar salt (SS) and various skeleton support materials (SSMs), including diatomite (Dia), return fine (RF) and fly ash (FA), evaluated their thermophysical properties and compare their thermal energy storage (TES) performance with magnetite under identical volume conditions numerically. After 100 cycles, Dia, RF and FA can encapsulate 50 %, 10 % and 30 % SS, maintaining macrostructural integrity and microscopic uniformity. Post-sintering densification raises thermal conductivity to 0.55, 0.87, 1.86 and 0.99 W/(m·K) for 5Dia5SS, 7FA3SS, 9RF1SS and 3Dia2RF5SS. Relative enthalpy efficiencies for 7FA3SS, 5Dia5SS, 9RF1SS and 3Dia2RF5SS are 95.0 %, 94.4 %, 80.0 % and 90.2 %, with RF exhibiting the lowest efficiency. Numerical simulations reveal that, due to lower densities, 7FA3SS, 5Dia5SS and 3Dia2RF5SS exhibit reduced volumetric heat capacity and power compared to magnetite over broad temperature ranges. However, delivered energy increased by 11.2 %, 11.2 % and 9.1 % for 4Do6SS, 5Do5SS and 9RF1SS, respectively. The latter three SSPCMPs show a more pronounced energy storage advantage over magnetite over narrower temperature ranges, but the power disadvantage remains. Enhancing SSPCMP thermal conductivity and improving heat transfer contact can accelerate charging, maximize latent heat utilization, and enhance TES performance.

Suggested Citation

  • Ji, Mengting & Lv, Laiquan & Zhou, Hao, 2025. "Preparation and performance analysis of different types of shape-stable phase change particles for thermal energy storage system," Renewable Energy, Elsevier, vol. 252(C).
  • Handle: RePEc:eee:renene:v:252:y:2025:i:c:s0960148125011838
    DOI: 10.1016/j.renene.2025.123521
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