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

Francisco Sierra; J. Bai; T. Maksoud

doi:10.1016/j.enbuild.2014.11.049

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

Francisco Sierra, J. Bai, T. Maksoud

Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

333 Wedi eu Llwytho i Lawr (Pure)

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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.

Iaith wreiddiol	Saesneg
Tudalennau (o-i)	342-347
Cyfnodolyn	Energy and Buildings
Cyfrol	87
Dynodwyr Gwrthrych Digidol (DOIs)	https://doi.org/10.1016/j.enbuild.2014.11.049
Statws	Cyhoeddwyd - 1 Ion 2015

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10.1016/j.enbuild.2014.11.049Trwydded: CC BY-NC-ND

JOURNAL PAPER after correctionsLlawysgrif awdur wedi’i dderbyn, 801 KBTrwydded: CC BY-NC-ND

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title = "Impact of the simplification of the methodology used to assess the thermal bridge of the head of an opening",

abstract = "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.",

keywords = "Thermal bridge, Low energy building design, Steel lintel, Condensation, Psi-value methodology for window head",

author = "Francisco Sierra and J. Bai and T. Maksoud",

year = "2015",

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doi = "10.1016/j.enbuild.2014.11.049",

language = "English",

volume = "87",

pages = "342--347",

journal = "Energy and Buildings",

issn = "0378-7788",

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TY - JOUR

T1 - Impact of the simplification of the methodology used to assess the thermal bridge of the head of an opening

AU - Sierra, Francisco

AU - Bai, J.

AU - Maksoud, T.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - 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.

AB - 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.

KW - Thermal bridge

KW - Low energy building design

KW - Steel lintel

KW - Condensation

KW - Psi-value methodology for window head

U2 - 10.1016/j.enbuild.2014.11.049

DO - 10.1016/j.enbuild.2014.11.049

M3 - Article

SN - 0378-7788

VL - 87

SP - 342

EP - 347

JO - Energy and Buildings

JF - Energy and Buildings

ER -

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

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