Investigating the Correlation between Water Vapor Permeability and Pure Diffusion in Building Materials
Authors
Hundevad, Patrick Andersen ; Luckenwald, Tonje
Term
4. term
Publication year
2023
Abstract
This master’s thesis investigates whether there is a correlation between water vapor permeability measured with the standardized wet/dry cup method (DS/EN ISO 12572) and pure diffusion measured with the Oxygen Diffusion Apparatus 2020 (ODA20) in various building materials. The wet/dry cup method is widely used but challenged by long test durations and unstable boundary conditions, whereas ODA20 uses oxygen as a tracer gas and provides a direct diffusion measure much faster. The thesis outlines the experimental setup, sample preparation, and calibrations, and compares results from the two methods to assess correlation and practical usability. Findings indicate that ODA20 is less precise than the cup method but can process more samples in a short time (about 2 hours versus up to several weeks), offering a quick overview of materials’ diffusion rates. The conclusion is that the choice of method should depend on the desired level of precision and the purpose of the investigation.
Denne masterafhandling undersøger, om der er en sammenhæng mellem vanddampspermeabilitet målt med den standardiserede våd/tør kop-metode (DS/EN ISO 12572) og ren diffusion målt med Oxygen Diffusion Apparatus 2020 (ODA20) i forskellige byggematerialer. Våd/tør kop-metoden er udbredt, men udfordres af lange måletider og ustabile randbetingelser, mens ODA20 bruger ilt som spor-gas og leverer et direkte mål for diffusion betydeligt hurtigere. Afhandlingen beskriver forsøgsopstilling, prøveforberedelse og kalibrering og sammenligner resultaterne fra de to metoder for at vurdere korrelation og anvendelighed. Resultaterne viser, at ODA20 er mindre præcis end kop-metoden, men kan teste flere prøver på kort tid (ca. 2 timer mod op til flere uger) og dermed give en hurtig oversigt over materialers diffusionshastighed. Konklusionen er, at metodevalget bør afhænge af det ønskede præcisionsniveau og formålet med undersøgelsen.
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