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Arfvidsson, Jesper. A New Algorithm to Calculate the Isothermal Moisture Penetration for Periodically Varying Relative Humidity at the Boundary. Nordic Journal Of Building Physics: Acta Physica Aedificiorum, p. 1 -1, 1999.
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Abstract

The paper presents a method to calculate the moisture penetration depth and the undisturbed moisture level, inside the region of periodic variation, in a porous material subjected to a periodic relative humidity variation at the boundary. The moisture properties may be highly non-linear. The method is strictly valid for a semi-infinite material. The theory to determine the undisturbed moisture level is given in detail, and a calculation method to determine the penetration depth is presented. A specially designed computer program has been developed. Results for six different building materials subjected to daily and annual periodic relative humidity at the boundary are given.
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