Sharp Front analysis of moisture buffering
DOI:
https://doi.org/10.21809/rilemtechlett.2021.136Keywords:
Moisture buffering; Moisture emissivity; Penetration depth; Sharp-Front model; Sorption; Vapour permeabilityAbstract
Moisture buffering describes the use of materials with high water-vapour sorption capacity to provide humidity control
in interior spaces. Established models of the moisture dynamics of buffering are derived from conventional Fickian vapour-diffusion
equations. We describe an alternative analysis using a Sharp-Front formulation. This yields a similar expression for the
moisture effusivity, several consistent scalings and a new definition of the moisture penetration depth. Features of the model are compared with
some published experimental data. A new sorption buffer index is a measurable experimental property that describes the water-vapour
buffer strength of the material.
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