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HAM simulation of the drying out capacity of water ingress in wooden constructions

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Abstract
Due to more stringent energy codes, the advantages of wood-frame construction –slender walls in respect to the thermal resistance – have been picked up by the construction market in Belgium. This construction type is not endogenous, and the configuration of building components is often copied from Scandinavian building practice. However, climatic differences may induce additional risks for premature failure due to e.g. water ingress or interstitial condensation. Currently, it remains unclear how much water can be tolerated in wood-frame construction without causing excessive moisture contents. In this paper, the impact of water ingress is evaluated with a 2D hygrothermal model. Static experiments were conducted on the water penetration at window-wall interfaces to relate the water ingress to both wind pressure and the airtightness of the component. A method is proposed to relate these infiltration rates to measured wind pressures to allow for an assessment of the components by means of hygrothermal simulations under a realistic climate. HAM simulation taking into account the expected water ingress loads offers a rapid and realistic method of risk assessment for wooden constructions. Penetrated water was found to be a dominating parameter for the wood moisture content in cases where the initial moisture content and vapour diffusion resistance of the components was altered.
Keywords
Heat – air – moisture, EN 1207, Water penetration, WUFI, wind driven rain, experimental, static test method, water ingress, drying out capacity

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Citation

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MLA
De Meersman, Glenn, Nathan Van Den Bossche, and Arnold Janssens. “HAM Simulation of the Drying Out Capacity of Water Ingress in Wooden Constructions.” 10th Nordic Symposium on Building Physics, Proceedings. Ed. Arfvidsson Jesper et al. 2014. 1116–1123. Print.
APA
De Meersman, G., Van Den Bossche, N., & Janssens, A. (2014). HAM simulation of the drying out capacity of water ingress in wooden constructions. In A. Jesper, H. Lars-Erik, K. Anders, & R. Bitte (Eds.), 10th Nordic Symposium on Building Physics, Proceedings (pp. 1116–1123). Presented at the 10th Nordic Symposium on Building Physics.
Chicago author-date
De Meersman, Glenn, Nathan Van Den Bossche, and Arnold Janssens. 2014. “HAM Simulation of the Drying Out Capacity of Water Ingress in Wooden Constructions.” In 10th Nordic Symposium on Building Physics, Proceedings, ed. Arfvidsson Jesper, Harderup Lars-Erik, Kumlin Anders, and Rosencrantz Bitte, 1116–1123.
Chicago author-date (all authors)
De Meersman, Glenn, Nathan Van Den Bossche, and Arnold Janssens. 2014. “HAM Simulation of the Drying Out Capacity of Water Ingress in Wooden Constructions.” In 10th Nordic Symposium on Building Physics, Proceedings, ed. Arfvidsson Jesper, Harderup Lars-Erik, Kumlin Anders, and Rosencrantz Bitte, 1116–1123.
Vancouver
1.
De Meersman G, Van Den Bossche N, Janssens A. HAM simulation of the drying out capacity of water ingress in wooden constructions. In: Jesper A, Lars-Erik H, Anders K, Bitte R, editors. 10th Nordic Symposium on Building Physics, Proceedings. 2014. p. 1116–23.
IEEE
[1]
G. De Meersman, N. Van Den Bossche, and A. Janssens, “HAM simulation of the drying out capacity of water ingress in wooden constructions,” in 10th Nordic Symposium on Building Physics, Proceedings, Lund, Sweden, 2014, pp. 1116–1123.
@inproceedings{5640505,
  abstract     = {Due to more stringent energy codes, the advantages of wood-frame construction –slender walls in respect to the thermal resistance – have been picked up by the construction market in Belgium. This construction type is not endogenous, and the configuration of building components is often copied from Scandinavian building practice. However, climatic differences may induce additional risks for premature failure due to e.g. water ingress or interstitial condensation. Currently, it remains unclear how much water can be tolerated in wood-frame construction without causing excessive moisture contents. In this paper, the impact of water ingress is evaluated with a 2D hygrothermal model. Static experiments were conducted on the water penetration at window-wall interfaces to relate the water ingress to both wind pressure and the airtightness of the component. A method is proposed to relate these infiltration rates to measured wind pressures to allow for an assessment of the components by means of hygrothermal simulations under a realistic climate. HAM simulation taking into account the expected water ingress loads offers a rapid and realistic method of risk assessment for wooden constructions. Penetrated water was found to be a dominating parameter for the wood moisture content in cases where the initial moisture content and vapour diffusion resistance of the components was altered.},
  articleno    = {139},
  author       = {De Meersman, Glenn and Van Den Bossche, Nathan and Janssens, Arnold},
  booktitle    = {10th Nordic Symposium on Building Physics, Proceedings},
  editor       = {Jesper, Arfvidsson and Lars-Erik, Harderup and Anders, Kumlin and Bitte, Rosencrantz},
  isbn         = {9789188722539},
  keywords     = {Heat – air – moisture,EN 1207,Water penetration,WUFI,wind driven rain,experimental,static test method,water ingress,drying out capacity},
  language     = {eng},
  location     = {Lund, Sweden},
  pages        = {139:1116--139:1123},
  title        = {HAM simulation of the drying out capacity of water ingress in wooden constructions},
  year         = {2014},
}