A master thesis from Aalborg University
Investigation of hysteresis in biobased insulation: Moisture sorption measurements and dynamic wall-scale experiments
[Undersøgelse af hysterese i biobaseret isolering: Fugtsorptionsmålinger og dynamisk vægskala-eksperiment]
Author(s)
Term
4. term
Publication year
2025
Submitted on
2025-06-04
Pages
263 pages
Abstract
This thesis explores the moisture performance of biobased insulation materials, focusing on hysteresis under realistic humidity conditions. An analysis of relative humidity inside of wall-elements found that the fluctuations are +-10% and upwards of 50 hours. Therefore, moisture sorption measurements were made at small intervals both for fast and slow durations on Aerated Autoclaved concrete, Woodfiber, and Hempfiber insulation. For these intervals, hysteresis was observed. A climatic chamber was constructed to test wall elements with different insulation materials and vapour barriers. The results led to initial trends regarding biobased materials and vapour barriers. Measurements are compared with WUFI-simulations, where temperatures matched well but diverged on RH. The study highlights the discrepancies between reality and modelling.
Documents
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