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Moisture Conditions in Exterior Walls for Net Zero Energy Buildings in Cold Climate - Considering Future Climate

Berggren, Björn LU and Wall, Maria LU (2012) 7th International Cold Climate HVAC Conference
Abstract
An important measure for climate change mitigation is reduction of energy use in buildings worldwide. To decrease the energy use of a building in a Nordic climate, increased thermal resistance of the building envelope is a suitable measure. Adding more insulation in combination with climate change may increase the risk of mold growth within the building envelope. This study evaluates hygrothermal conditions for three different wood frame wall assemblies and four different locations in Sweden. The evaluation is based on simulations where the exterior climate is based on a climate scenario from the Swedish Meteorological and Hydrological Institute. The evaluation of the climate scenarios show a trend of increased precipitation and... (More)
An important measure for climate change mitigation is reduction of energy use in buildings worldwide. To decrease the energy use of a building in a Nordic climate, increased thermal resistance of the building envelope is a suitable measure. Adding more insulation in combination with climate change may increase the risk of mold growth within the building envelope. This study evaluates hygrothermal conditions for three different wood frame wall assemblies and four different locations in Sweden. The evaluation is based on simulations where the exterior climate is based on a climate scenario from the Swedish Meteorological and Hydrological Institute. The evaluation of the climate scenarios show a trend of increased precipitation and temperature. Examining the hygrothermal conditions; all evaluations models indicate an increased risk of mold growth over time due to climate change. Adding more insulation to a building envelope will decrease the dehydration of built-in moisture. However, adding more insulation to the exterior side of a wood frame construction results into more stabile hygrothermal conditions. Based on the results from the simulations it is recommended that all constructions with bio gradable materials should be given exterior insulation to decrease the risk of mold growth. Furthermore, building elements must always be designed to have the ability to dehydrate moisture that has entered, whether it is due to driving rain, built in moisture or other reasons. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to conference
publication status
published
subject
keywords
Energy, moisture, Net ZEB, mould, climate scenario
conference name
7th International Cold Climate HVAC Conference
external identifiers
  • Scopus:84938880441
language
English
LU publication?
yes
id
326f8be9-5a9f-4e82-a329-a4cea05eb24d (old id 3515973)
date added to LUP
2014-04-28 11:20:08
date last changed
2016-10-13 04:52:18
@misc{326f8be9-5a9f-4e82-a329-a4cea05eb24d,
  abstract     = {An important measure for climate change mitigation is reduction of energy use in buildings worldwide. To decrease the energy use of a building in a Nordic climate, increased thermal resistance of the building envelope is a suitable measure. Adding more insulation in combination with climate change may increase the risk of mold growth within the building envelope. This study evaluates hygrothermal conditions for three different wood frame wall assemblies and four different locations in Sweden. The evaluation is based on simulations where the exterior climate is based on a climate scenario from the Swedish Meteorological and Hydrological Institute. The evaluation of the climate scenarios show a trend of increased precipitation and temperature. Examining the hygrothermal conditions; all evaluations models indicate an increased risk of mold growth over time due to climate change. Adding more insulation to a building envelope will decrease the dehydration of built-in moisture. However, adding more insulation to the exterior side of a wood frame construction results into more stabile hygrothermal conditions. Based on the results from the simulations it is recommended that all constructions with bio gradable materials should be given exterior insulation to decrease the risk of mold growth. Furthermore, building elements must always be designed to have the ability to dehydrate moisture that has entered, whether it is due to driving rain, built in moisture or other reasons.},
  author       = {Berggren, Björn and Wall, Maria},
  keyword      = {Energy,moisture,Net ZEB,mould,climate scenario},
  language     = {eng},
  title        = {Moisture Conditions in Exterior Walls for Net Zero Energy Buildings in Cold Climate - Considering Future Climate},
  year         = {2012},
}