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Passive energy-saving design strategy and realization on high window-wall ratio buildings in subtropical regions

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  • Xie, Xing
  • Xu, Bin
  • Fei, Yue
  • Chen, Xing-ni
  • Pei, Gang
  • Ji, Jie

Abstract

Indoor overheating in high window-wall ratio (WWR) buildings has drawn widespread attention, but there is limited research on it during winter. Similarly, the application of radiative cooling (RC) technology on high-WWR facades and the effectiveness of combining RC with phase change materials (PCMs) need exploration. In Guangzhou, typical rooms in commercial buildings were studied, revealing that high-WWR buildings experience greater indoor overheating in winter compared to summer. For a 100 % WWR, the total equivalent energy consumption (EEC) is 71.389 kWh·m−2 in winters, 7.8 % higher than summer. Using RC glass with high solar (diffuse) reflectivity (0.65) on south-facing windows reduced EEC by over 70 %. RC glass also provided significant cooling capacity during unoccupied periods, which is sufficient to meet daytime cooling needs. In the case of a 100 % WWR, the proportion of available cooling capacity (37.5 %) during unoccupied period exceeded daytime cooling EEC (24.9 %). Therefore, PCMs were adopted to store this cooling capacity and transfer it for release during the occupied period, which bring an additional improvement in energy-saving performance by 4.7 %. The combination of PCMs and RC technology further achieves building energy efficiency. This study offers insights for addressing winter indoor overheating in high-WWR buildings.

Suggested Citation

  • Xie, Xing & Xu, Bin & Fei, Yue & Chen, Xing-ni & Pei, Gang & Ji, Jie, 2024. "Passive energy-saving design strategy and realization on high window-wall ratio buildings in subtropical regions," Renewable Energy, Elsevier, vol. 229(C).
    • Handle: RePEc:eee:renene:v:229:y:2024:i:c:s0960148124007778
    DOI: 10.1016/j.renene.2024.120709
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    References listed on IDEAS

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