Integration model of hygrothermal analysis with decay process for durability assessment of building envelopes
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In this study a numerical simulation model that integrates hygrothermal analysis with the decaying process of wood structures caused by moisture accumulation is presented. This simulation model can quantitatively predict both hygrothermal conditions within the building envelopes and the progress of decay in wood structures under variable conditions. The following are characteristics of the simulation model used in this study: (1) the development of wood decay represented by a differential equation with a variable of mass loss of wood substance and (2) the addition into moisture balance equations of biochemical reactions within wood decay. Hence, the simulation model enables assessment of the long-term performance of building envelopes with regard to both durability and drying potential. Rate constants of the wood decay and a coefficient of the moisture production for the model were determined by the mass loss data of small wood samples in decay tests using Fomitopsis palustris, a brown rot fungus. Additionally, numerical simulations using the model were implemented to understand both the decaying process and moisture accumulation within building envelopes. The results numerically demonstrated important phenomenon that the moisture production by biochemical reactions of wood decay helps to maintain the decaying process.
- EN 133 (1991). Determination of toxic value of wood preservatives against wood destroying basidiomycetes cultured on agar medium. European Committee for Standardization, Brussel.
- Fukuda K, Okayasu Y, Haraguchi T (1981). Influence of temperature on the growth and wood-decomposing ability of wood-rotting fungi. Bulletin Experiment Forests Tokyo University of Agriculture and Technology, 17: 49–55.
- Gooding GV, Hodges CS, Ross EW (1966). Effect of temperature on growth and survival of Fomesannosus. Forest Science, 12: 325–333.
- Hens H (1996). Heat, air, and moisture transfer in insulated envelope parts. Task 1; modeling. Final Report, International Energy Agency, Energy Conservation in Buildings and Community System. Annex24: — Heat, Air, and Moisture Transfer in New and Retrofitted Building Envelope Parts.
- JIS K 1571 (2004). Test methods for determining the effectiveness of wood preservatives and their performance requirements. Japanese Standard Association, Japan.
- Krus M, Sedlbauer K (2005). Mould growth prediction by computational simulation. Annex41 Report “A1-T4-D-5-1.pdf” in Trondheim Meeting, Trondheim, Norway.
- Kumaran K, Lackey J, Normandin N, van Reenen D, Tariku F (2002). Hygrothermal properties of several building materials. Summary Report from Task 3 of MEWS Project (NRCC-45369).
- Nofal M, Kumaran MK (1999). Durability assessments of wood-frame construction using the concept of damage-functions. In: Proceedings of the 8th International Conference Durability of Building Materials and Components (pp. 766–799), Vancouver, Canada.
- Nofal M, Kumaran MK (2011). Biological damage function models for durability assessments of wood and wood-based products in building envelopes. European Journal of Wood and Wood Products, 69: 619–631. CrossRef
- Suzuki K (1994). Effect of cyclic change of temperature on fungal growth and mass loss. The International Research Group on Wood Preservation, Document No.IRG/WP 94-10065, Bali, Indonesia.
- Viitanen HA (1997). Modelling the time factor in the development of brown rot decay in pine and spruce sapwood — The effect of critical humidity and temperature conditions. Holzforschung, 51: 96–106.
- Viitanen H, Toratti T, Makkonen L, Peuhkuri R, Ojanen T, Ruokolainen L, Räisänen J (2010). Towards modeling of decay risk of wooden materials. European Journal of Wood and Wood Products, 68: 303–313 CrossRef
- Zabel RA, Morrell JJ (1992). Wood Microbiology — Decay and Its Prevention. London: Academic Press.
- Zelinka S, Derome, D, Glass S (2011). Combining hygrothermal and corrosion models to predict corrosion of metal fasteners embedded in wood. Building and Environment, 46: 2060–2068. CrossRef
- Integration model of hygrothermal analysis with decay process for durability assessment of building envelopes
Volume 5, Issue 4 , pp 315-324
- Cover Date
- Print ISSN
- Online ISSN
- Tsinghua Press
- Additional Links
- building envelope
- hygrothermal analysis
- durability assessment
- wood decay
- biochemical reaction
- Author Affiliations
- 1. Ashikaga Institute of Technology, Division of Architecture and Civil Engineering, 268-1, Ohmae-Cho, Ashikaga-City Tochigi-Pre., 326-8558, Japan
- 2. Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu, Tokyo, 183-8509, Japan
- 3. Department of Environmental Engineering, Building Research Institute, 1 Tachihara, Tsukuba, Ibaraki, 305-0802, Japan