Frost formation and condensation in stone-wool insulants
2008 (English)In: Proceedings of the 8th Symposium on Building Physics in the Nordic Countries, 2008, 473-480 p.Conference paper (Refereed)
Practical experience from building sites show evidence of negative effects of moisture condensation oninsulating materials with fibrous structure. Condensed moisture, as well as moisture trapped in thermalinsulation during construction, can results in serious reduction of thermal properties and, in consequence,systemic upset of living qualities in dwellings. It can also result in increased dust contamination, algae or mouldgrowth and structural damages due to a frost formation of condensate happening in winter periods.
This contribution reports on a laboratory experiment aimed at growth of frost formation and moisturecondensation in stone wool opened to air for specific temperature fields (+20; -20ºC), (+20; -15ºC), (+20; -10ºC) over stone-wool specimens with varying density during a testing period that lasted 100 hours. Air on thewarm side was saturated with moisture. In the part facing the warm humid air condensate formation occurred,while frost accumulated with time in the part of the specimen facing the cold air. Transition between frost andliquid condensate was clearer in the stone-wool specimens of higher density and for tests with broadertemperature fields. Moisture resistance factor μ, a basic moisture characteristic of an insulating material, alsohad an upward trend for broader temperature intervals.
Deeper knowledge about the phenomenon of frost formation in stone wool can help to insight into actualproblems in the building sector resulting from usage of thermal insulations with high thicknesses.
Place, publisher, year, edition, pages
2008. 473-480 p.
Stone wool, material properties, frost formation, condensation, moisture transport.Symposium
Materials Engineering Building Technologies
IdentifiersURN: urn:nbn:se:kth:diva-11667OAI: oai:DiVA.org:kth-11667DiVA: diva2:279168
QC 201008182009-12-022009-12-022010-08-18Bibliographically approved