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The process of renovation of historical buildings is a broad topic, which includes various branches of building engineering, such as building physics, life cycle of material and buildings, energy assessment and others. In this paper, the author focuses on the prediction of the internal surface temperature factor, since its assessment is necessary for the design of the building envelope, excluding the effect of surface condensation at the corners. In the simulation program, a 2D detail of the corner in the external perimeter wall of the building structure with and without external thermal insulation composite system (ETICS) was created and a sheet of highly conductive material was added. The effect of a 1 mm thick aluminum sheet on the internal surface temperature over a time period of five years was investigated under unsteady-state conditions. The main objective of the simulation was to investigate, in first phase, the behavior of the internal surface temperature at the corner of an external perimeter wall with ETICS, and in a second phase the behavior of internal surface temperature at the corner of an outer perimeter wall without ETICS. The implementation process was stated due to the time gap, when the external perimeter wall is exposed to climate conditions before re-installation of ETICS. The time gap varies and in the central European region can extend into the winter season. The results were based on comparison of internal surface temperature factor according to the International standard with the results obtained from the simulation. The charts show the development of the curve of internal surface temperature with addition of aluminum sheet over the curve of the critical internal surface temperature factor for most days in the months January, February, November and December. On the other hand, the development shows the curve of the internal surface temperature without addition of aluminum sheet below the curve of the critical internal surface temperature factor, thus surface condensation cannot be excluded in this case. It is also interesting to determine the effect of the materials with different thermal conductivities placed behind the aluminum sheet on the internal surface temperature and the location in the external perimeter wall relative to the thermal bridge.

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The Assessment of Details of Existing Building Structures with the Addition of a Thermally Conductive Element

  • 会议论文

  • 发表日期：

    2026年

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  • Martin Králík,
  • Miloš Kalousek

摘要

The process of renovation of historical buildings is a broad topic, which includes various branches of building engineering, such as building physics, life cycle of material and buildings, energy assessment and others. In this paper, the author focuses on the prediction of the internal surface temperature factor, since its assessment is necessary for the design of the building envelope, excluding the effect of surface condensation at the corners. In the simulation program, a 2D detail of the corner in the external perimeter wall of the building structure with and without external thermal insulation composite system (ETICS) was created and a sheet of highly conductive material was added. The effect of a 1 mm thick aluminum sheet on the internal surface temperature over a time period of five years was investigated under unsteady-state conditions. The main objective of the simulation was to investigate, in first phase, the behavior of the internal surface temperature at the corner of an external perimeter wall with ETICS, and in a second phase the behavior of internal surface temperature at the corner of an outer perimeter wall without ETICS. The implementation process was stated due to the time gap, when the external perimeter wall is exposed to climate conditions before re-installation of ETICS. The time gap varies and in the central European region can extend into the winter season. The results were based on comparison of internal surface temperature factor according to the International standard with the results obtained from the simulation. The charts show the development of the curve of internal surface temperature with addition of aluminum sheet over the curve of the critical internal surface temperature factor for most days in the months January, February, November and December. On the other hand, the development shows the curve of the internal surface temperature without addition of aluminum sheet below the curve of the critical internal surface temperature factor, thus surface condensation cannot be excluded in this case. It is also interesting to determine the effect of the materials with different thermal conductivities placed behind the aluminum sheet on the internal surface temperature and the location in the external perimeter wall relative to the thermal bridge.