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<p>In one of the most recent advances aimed at enhancing the thermal inertia of building structures, the integration of phase change materials (PCMs) into the roofing system has demonstrated a significant impact on reducing internal temperature fluctuations and overall energy transfer to indoor spaces. This study evaluates the effectiveness of PCM layers incorporated into building roofs, focusing on their performance at three different positions and across varying thicknesses, specifically under the warm and humid climatic conditions of Silchar, India. The objective is to minimize the heat gain into the interior and lower the internal surface temperature, thereby improving indoor thermal comfort. The numerical study, which is conducted with and without the presence of PCM, reveals that a 20-mm-thick PCM layer can significantly reduce the overall energy transfer to the interior by 63.23%. The most effective configuration is found when the PCM is positioned between two reinforced concrete layers near the bottom layer, which results in the lowest heat flux. Additionally, this configuration reduces the peak temperature by 7&#xa0;°C and provides a substantial time lag of 3&#xa0;h to reach the maximum average roof temperature, featuring its potential for passive thermal regulation.</p>

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Impact of phase change material placement and thickness on roof thermal inertia in the warm and humid climate of Northeast India

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Amit Kumar,
  • Dipankar Bhanja,
  • Agnimitra Biswas

摘要

In one of the most recent advances aimed at enhancing the thermal inertia of building structures, the integration of phase change materials (PCMs) into the roofing system has demonstrated a significant impact on reducing internal temperature fluctuations and overall energy transfer to indoor spaces. This study evaluates the effectiveness of PCM layers incorporated into building roofs, focusing on their performance at three different positions and across varying thicknesses, specifically under the warm and humid climatic conditions of Silchar, India. The objective is to minimize the heat gain into the interior and lower the internal surface temperature, thereby improving indoor thermal comfort. The numerical study, which is conducted with and without the presence of PCM, reveals that a 20-mm-thick PCM layer can significantly reduce the overall energy transfer to the interior by 63.23%. The most effective configuration is found when the PCM is positioned between two reinforced concrete layers near the bottom layer, which results in the lowest heat flux. Additionally, this configuration reduces the peak temperature by 7 °C and provides a substantial time lag of 3 h to reach the maximum average roof temperature, featuring its potential for passive thermal regulation.