Quantifying Time Dependent Moisture Storage and Transport Properties

Ruut H Peuhkuri

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


This paper describes an experimental and numerical approach to quantify the time dependence of sorption mechanisms for some hygroscopic building - mostly insulation - materials. Some investigations of retarded sorption and non-Fickian phenomena, mostly on wood, have given inspiration to the present analysis on these other materials. The true moisture capacity of a material can not be described by the slope of the sorption isotherms alone, when the material is exposed to dynamic changes in the moisture conditions. Still, the assumption of an immediate equilibrium is well accepted in the simulation models. A number of small specimens are exposed to ab- and desorption steps in a controlled relative humidity and temperature. The change in the bulk moisture content is followed continuously as the specimen is directly attached to a balance. The experimental results show retarded sorption. A preliminary approach for determining a sorption coefficient, which can model retarded sorption, is encouraging.
Original languageEnglish
Title of host publicationResearch in Building Physics : Proceedings of the 2nd International Conference on Building Physics
Number of pages1020
Place of Publicationthe Netherlands
PublisherCRC Press/Balkema
Publication date2003
ISBN (Print)90-5809-565-7
Publication statusPublished - 2003
Event2nd International Building Physics Conference - Leuven, Belgium
Duration: 14 Sep 200318 Sep 2003
Conference number: 2


Conference2nd International Building Physics Conference

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