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  • renovation, repair, maintenance



    • Related References
  • Krus, M. and Holm A., (0), Simple methods to approximate the liquid transport coefficients describing the absorption and drying
  • WTA
    Kunzel, H. M., (2000), Moisture risk assessment of roof constructions by computer simulation in comparison to the standard Glaser-method



    • Related Articles
    		Essay:

    WTA Working group (Building Restoration and Conservation)

    WTA (Wissenschaftlich-Technische Arbeitsgemeinschaft f¨¹r Bauwerkserhaltung und Denkmalpflege): http://www.wta.de/ (in German)

    Following copied from: http://www.hoki.ibp.fhg.de/wufi/grundl_ueberblick_e.html (May'02)

    Practical Conclusions

    Computer simulation of non-steady heat and moisture transport is not only of theoretical interest, it also offers numerous advantages for the practitioner. Some areas of application and novel possibilities (beyond Glaser) to assess the hygrothermal behavior of building components exposed to natural weather are:

    * realistic dew water situation during the heating period, properly allowing for water vapor sorption and capillary conduction

    * drying of construction moisture

    * summer condensation due to reverse diffusion

    * solar radiation, driving rain load and surface condensation on roofs and facades

    effect of moisture on energy consumption

    The results for the moisture and temperature fields in the component are available in any desired spatial or temporal resolution. They may for example be used for

    *extrapolating experimental results

    *transferring construction types between different climate conditions

    *planning new buildings or renovation measures for old buildings

    *developing and optimizing new building products

    *determining the maximum allowed indoor moisture loads

    *determining the hygrothermal requirements for and the limits of proper application of building materials and components

    In recent years, these advantages of hygrothermal simulations have created strong demand for calculative investigations, especially in the context of renovation measures for old buildings since standard solutions are often not applicable here. So far, however, there are no general guidelines for appropriate contract specifications or for proper application of the novel methods. For this reason the WTA (Wissenschaftlich-Technische Arbeitsgemeinschaft f¨¹r Bauwerkserhaltung und Denkmalpflege) established a WTA working group in 1997 whose task is the formulation of such guidelines. The Task Group "Moisture Calculation" established in 2000 within the European Technical Committee TC89 (Thermal Performance of Buildings and Building Components) is working on similar objectives. Thus the prerequisites for standardized application of hygrothermal simulation methods in civil engineering and architecture are being devised both on a national and on an international level.



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