Skip to main content

Research Repository

Advanced Search

Impact of the simplification of the methodology used to assess the thermal bridge of the head of an opening

Sierra, Francisco; Bai, J.; Maksoud, Talal

Authors

J. Bai

Talal Maksoud



Abstract

© 2014 Published by Elsevier B.V. The interface between the head of the window and the wall represents one of the largest thermal bridges of a building and one of the areas with the highest risk of surface condensation and mould growth. This study is concerned with the reliability and accuracy of assessing this thermal bridge heat loss and surface temperature at the junction of a window with a specific steel lintel where the window frame itself is excluded from the thermal model. Four cases were modelled, covering the evolution of the construction details of this junction, following changes in British legislation in regards to U-values. They were assessed with HEAT2D software under the standard (simplified) method and a more detailed approach. The outputs revealed that replacing the window frame with an adiabatic surface during the modelling process (as per standard) underestimates the risks of mould growth or surface condensation (as per Part L1A 2010), especially if the window has a high U-value.

Citation

Sierra, F., Bai, J., & Maksoud, T. (2015). Impact of the simplification of the methodology used to assess the thermal bridge of the head of an opening. Energy and Buildings, 87, 342-347. https://doi.org/10.1016/j.enbuild.2014.11.049

Journal Article Type Article
Acceptance Date Nov 14, 2014
Publication Date Jan 1, 2015
Deposit Date Oct 20, 2016
Journal Energy and Buildings
Print ISSN 0378-7788
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 87
Pages 342-347
DOI https://doi.org/10.1016/j.enbuild.2014.11.049
Keywords thermal bridge, low energy building design, steel lintel, condensation, psi-value methodology for window head
Public URL https://uwe-repository.worktribe.com/output/844423
Publisher URL http://dx.doi.org/10.1016/j.enbuild.2014.11.049