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This study aims to clarify the effects of improving envelope performance by measuring the thermal environment before and after retrofitting a existing office building scheduled for facility and envelope retrofit. Simulations of building energy consumption and the indoor environment were conducted and compared with actual measurements to examine the validity of the evaluation and visualization methods. Through this series of studies, we aim to establish quantitative evaluation methods and develop design methods to improve existing buildings’ envelope performance. This study reports the results of an analysis of the temporal changes and heterogeneity of the thermal environment based on thermal environmental measurements to understand the current conditions before retrofit. The results of a simulation of the impact of retrofit on energy consumption and the indoor environment are also reported. Finally, a visualization method using 3D point cloud data, computational fluid dynamics (CFD) analysis, and augmented reality (AR) is described, which makes it possible to visually and easily grasp the effects of retrofit. The field measurement results confirm that the thermal environment is widely distributed in both summer and winter, and the spatial maldistribution and temporal variation are very large under low envelope performance. The simulation results indicated that retrofitting the building envelope is more effective than retrofitting the indoor load in terms of both the annual heat load and comfort zone.

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Improving Building Envelope Performance During Retrofit to Achieve Building Decarbonization

  • 会议论文

  • 发表日期：

    2026年

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  • Hidetoshi Maruyama,
  • Ryo Nakanishi,
  • Masanari Ukai,
  • Kan Shindo,
  • Daisuke Kuboi,
  • Hiroki Miyajima,
  • Reika Hagiya,
  • Shin-ichi Tanabe

摘要

This study aims to clarify the effects of improving envelope performance by measuring the thermal environment before and after retrofitting a existing office building scheduled for facility and envelope retrofit. Simulations of building energy consumption and the indoor environment were conducted and compared with actual measurements to examine the validity of the evaluation and visualization methods. Through this series of studies, we aim to establish quantitative evaluation methods and develop design methods to improve existing buildings’ envelope performance. This study reports the results of an analysis of the temporal changes and heterogeneity of the thermal environment based on thermal environmental measurements to understand the current conditions before retrofit. The results of a simulation of the impact of retrofit on energy consumption and the indoor environment are also reported. Finally, a visualization method using 3D point cloud data, computational fluid dynamics (CFD) analysis, and augmented reality (AR) is described, which makes it possible to visually and easily grasp the effects of retrofit. The field measurement results confirm that the thermal environment is widely distributed in both summer and winter, and the spatial maldistribution and temporal variation are very large under low envelope performance. The simulation results indicated that retrofitting the building envelope is more effective than retrofitting the indoor load in terms of both the annual heat load and comfort zone.