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  • Resultat 195651-195660 av 221910
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195651.
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195652.
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195653.
  • Thelandersson, Sven, et al. (författare)
  • Mould resistance design (MRD) model for evaluation of risk for microbial growth under varying climate conditions
  • 2013
  • Ingår i: Building and Environment. - : Elsevier BV. - 1873-684X .- 0360-1323. ; 65, s. 18-25
  • Tidskriftsartikel (refereegranskat)abstract
    • The risk for microbial growth depends on the microclimatic conditions at material surfaces. In the building envelope the microclimate will vary significantly with time. Whether microbial growth will occur or not, depends on humidity, temperature, duration of exposure and type of material (substrate). A limit state for onset of mould growth is here defined as a prescribed level observed by microscopy (40 x) in laboratory tests. In this paper, a mould resistance design (MRD) model is proposed by which onset of growth can be predicted for an arbitrary climate history of combined relative humidity empty set and temperature T. The model is calibrated and verified against a comprehensive set of new experimental data describing mould development on wood specimens (spruce and pine) as a function of exposure of relative humidity and temperature and material and surface characteristics. The exposure in the tests comprised both steady and time-variable conditions. Application of the MRD-model is demonstrated by assessment of mould risk based on results from simulations of an external wall design with hygro-thermal computer software (WUFI). The results show that a generally applicable, quantitative model together with building physics software can be used as a powerful tool for moisture safety design in practice. The model is designed to facilitate continuous improvement by further laboratory testing of various materials under specified climate conditions. The MRD-model is controlled by a basic parameter in the form of a critical dose D-crit, which depends on the substrate or material surface on which growth may take place. (c) 2013 Elsevier Ltd. All rights reserved.
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195654.
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195655.
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195656.
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195657.
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195658.
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195659.
  • Thelandersson, Sven, et al. (författare)
  • Service life of wood in outdoor above ground applications - engineering design guideline
  • 2011
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • This engineering design guideline is intended for wood in outdoor above ground applications, i.e. use class 3 according to EN 335. It is based on a prescribed limit state for onset of decay during a reference service life of 30 years. Onset of decay is defined as a state of fungal attack according to rating 1 in EN 252. The approach is to determine the climate exposure as a function of geographical location, local exposure conditions, sheltering, distance to ground and design of details. The exposure is then compared with the material resistance defined in five classes and the design output is either OK or NOT OK. The present version of the guideline covers applications for decking and cladding. The data included in the guideline have partly been derived with the help of a dose-response model for decay, which was used to derive relative measures of decay risk between different locations and between different detail solutions. Other elements in the guideline have been estimated in a semi-subjective manner based on expert opinions as well as experience from field testing. The guideline has been verified by a number of reality checks of real buildings, which show that the output from the tool agrees well with documented experience. The guideline has also been presented in a computerized Excel format, which makes practical use more convenient. It is believed that many building professionals will appreciate a tool within the area of wood durability which has an approach similar to other design tasks in building projects. An advantage is that in applying the method the designer will go through a check list where he/she becomes aware of the importance of appropriate design and detailing solutions. In addition the user will have to consider the target service life as well as the consequences of non-performance in the design of a construction.
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195660.
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