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<p>Phase-change materials (PCMs) embedded in dynamic building envelopes can convert a passive insulation layer into an active solar-heating element. However, the thermophysical properties of the PCM used in a Dynamic Rotating Latent-Energy-Storage Envelope (DRLESE) have not been systematically optimized. This study aims to determine the PCM property combination that maximizes useful indoor heat release for winter auxiliary heating. A two-dimensional transient heat-transfer model of the DRLESE, based on the enthalpy (apparent heat-capacity) method and validated against published experimental data, was used to evaluate the effect of five PCM parameters: thermal conductivity, latent heat, solidus temperature, liquidus temperature, and layer thickness. Effective indoor thermal release and inner-surface heat flux were adopted as the evaluation indices. The results show that useful heat release peaks at a thermal conductivity of 2.0&#xa0;W/(m K), a solidus temperature of 26&#xa0;°C, and a liquidus temperature of 29&#xa0;°C. Increasing the latent heat improves performance up to about 178.5&#xa0;kJ/kg, beyond which the gain is below 3%, while increasing the layer thickness is beneficial up to 30&#xa0;mm, beyond which the gain is below 6%. Relative to the low-property baselines, the optimized conductivity and thickness raise the effective indoor heat release by 58.8% and 130.3%, and the average inner-surface heat flux by 55.5% and 129.7%, respectively. Overall, this study provides quantitative PCM-selection guidance specific to the rotating dynamic envelope and identifies the diminishing-returns thresholds for latent heat and layer thickness, offering a practical basis for cost-effective PCM specification in DRLESE systems.</p>

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Influence analysis of thermal properties of phase-change materials on the thermal efficiency of dynamic rotating latent-energy-storage envelope

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月31日

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  • Wei Mao,
  • Wenkai Fu,
  • Chenxu Zhao,
  • Yanna Gao

摘要

Phase-change materials (PCMs) embedded in dynamic building envelopes can convert a passive insulation layer into an active solar-heating element. However, the thermophysical properties of the PCM used in a Dynamic Rotating Latent-Energy-Storage Envelope (DRLESE) have not been systematically optimized. This study aims to determine the PCM property combination that maximizes useful indoor heat release for winter auxiliary heating. A two-dimensional transient heat-transfer model of the DRLESE, based on the enthalpy (apparent heat-capacity) method and validated against published experimental data, was used to evaluate the effect of five PCM parameters: thermal conductivity, latent heat, solidus temperature, liquidus temperature, and layer thickness. Effective indoor thermal release and inner-surface heat flux were adopted as the evaluation indices. The results show that useful heat release peaks at a thermal conductivity of 2.0 W/(m K), a solidus temperature of 26 °C, and a liquidus temperature of 29 °C. Increasing the latent heat improves performance up to about 178.5 kJ/kg, beyond which the gain is below 3%, while increasing the layer thickness is beneficial up to 30 mm, beyond which the gain is below 6%. Relative to the low-property baselines, the optimized conductivity and thickness raise the effective indoor heat release by 58.8% and 130.3%, and the average inner-surface heat flux by 55.5% and 129.7%, respectively. Overall, this study provides quantitative PCM-selection guidance specific to the rotating dynamic envelope and identifies the diminishing-returns thresholds for latent heat and layer thickness, offering a practical basis for cost-effective PCM specification in DRLESE systems.