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.

Comments

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DOI

https://doi.org/10.14305/ibpc.2018.ms-8.06

Creative Commons License

Creative Commons Attribution-Noncommercial 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

COinS
 
Sep 26th, 10:30 AM Sep 26th, 12:00 PM

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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