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  • 1.
    Gudmundsson, Kjartan
    KTH, Superseded Departments, Building Sciences and Engineering.
    An approach to determining the water vapour transport properties of buildingmaterials2003In: Nordic Journal of Building Physics: Acta Physica Aedificiorum, ISSN 1402-5728, Vol. 3Article in journal (Refereed)
    Abstract [en]

    An analytical model, based on the literature, is used to show how the material parameters that rule the transport of water vapour in porous building materials can be evaluated by tracer gas measurements. A distinction is made between viscous flow, Knudsen diffusion and continuum diffusion. Each transportmechanism is formulated by explicit functions of the textural properties of the material and the thermodynamic properties of the gas. Tracer gas measurements can therefore be used to reveal the textural properties of amaterial, from which the potential water vapour transport, in gas phase, can be derived from the thermodynamic properties of water vapour.The well known concentration dependency of the diffusion coefficient is explained with the random hoppingmodel. The random hopping describes how the surface diffusion of adsorbed molecules relates to the amount adsorbed and the energies involved in adsorption. It is also described how the activation energies of surfacemigration can be obtained from sorption measurements and how the constant parameters of the surface diffusioncoefficient can be determined by stationary or transient wet-cup measurements.

  • 2.
    Gudmundsson, Kjartan
    KTH, Superseded Departments, Building Sciences and Engineering.
    Isotopic tracing of moisture in buildings2001In: Nordic Journal of Building Physics: Acta Physica Aedificiorum, ISSN 1402-5728, Vol. 2, p. 1-10Article in journal (Refereed)
    Abstract [en]

    The means of tracing the flows of moisture in a building by using the stable isotopes of oxygen-18 and deuteriumare described. It is shown that knowledge of the effects of the transport mechanisms and reactions on the isotopiccomposition can be used to identify the sources of moisture. This is illustrated by an example from a building inthe southern part of Sweden.

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