Conference Editor
Jianshun Zhang; Edward Bogucz; Cliff Davidson; Elizabeth Krietmeyer
Keywords:
Building envelope, moisture dependent response, heat flux time shift, decrement factor
Location
Syracuse, NY
Event Website
http://ibpc2018.org/
Start Date
26-9-2018 10:30 AM
End Date
26-9-2018 12:00 PM
Description
Thermal properties of the opaque building envelope components are crucial for limiting the energy needs of a building. In particular, dynamic thermal properties of envelope components can significantly contribute to the minimization of heat transfer through the envelope and to the appropriate utilization of the internal and solar gains. This is particularly important in the cooling operation, especially in hot climates. Previous experimental and numerical studies on the determination of dynamic thermal parameters of opaque building components neglected the influence of moisture conditions prevailing within the ambient climate. This paper utilizes a calibrated and validated dynamic heat and mass transfer model to analyse the impact of ambient moisture conditions on the determination of dynamic thermal parameters. Time shift and decrement factor are determined for different wall structures (internally insulated or externally insulated) with regard to different outdoor climatic conditions (dry and humid climate). The impact of moisture conditions on the results is analysed and assessed. The results of this study clearly show that the effect of ambient moisture conditions on time shift and decrement factor can be significant and that an application of purely thermal models will lead to inaccurate predictions of the dynamic thermal behaviour of building components.
Recommended Citation
Bishara, Nadja and Gasparella, Andrea, "The effect of ambient moisture conditions on heat flux time shift and decrement factor of multi-layered walls" (2018). International Building Physics Conference 2018. 6.
DOI
https://doi.org/10.14305/ibpc.2018.ms-8.06
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 4.0 International License.
The effect of ambient moisture conditions on heat flux time shift and decrement factor of multi-layered walls
Syracuse, NY
Thermal properties of the opaque building envelope components are crucial for limiting the energy needs of a building. In particular, dynamic thermal properties of envelope components can significantly contribute to the minimization of heat transfer through the envelope and to the appropriate utilization of the internal and solar gains. This is particularly important in the cooling operation, especially in hot climates. Previous experimental and numerical studies on the determination of dynamic thermal parameters of opaque building components neglected the influence of moisture conditions prevailing within the ambient climate. This paper utilizes a calibrated and validated dynamic heat and mass transfer model to analyse the impact of ambient moisture conditions on the determination of dynamic thermal parameters. Time shift and decrement factor are determined for different wall structures (internally insulated or externally insulated) with regard to different outdoor climatic conditions (dry and humid climate). The impact of moisture conditions on the results is analysed and assessed. The results of this study clearly show that the effect of ambient moisture conditions on time shift and decrement factor can be significant and that an application of purely thermal models will lead to inaccurate predictions of the dynamic thermal behaviour of building components.
https://surface.syr.edu/ibpc/2018/MS8/6
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