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A platform for research: civil engineering, architecture and urbanism
Hygroscopic and Thermal Inertia Impact of Biobased Insulation in a Wood Frame Wall
In this study, large scale experiments are performed with walls implemented in a climatic chamber in order to assess either the hygroscopic impact or the thermal phase shift of flexible bio-based insulating materials and clay panels. The conditions are set to be as close as possible to the field. Before the large scale tests, the materials are characterized individually with moisture-buffering, sorption-desorption and water vapour permeability tests.
The aim of the first part is to assess the moisture buffering ability of a flexible bio-based insulating material set behind a OSB board. Conventional mineral wool (rock wool) is set inside wall n°1 and flax is set inside wall n°2. The outer side of the chamber is set at T = 5 ℃/RH = 80% in order to simulate winter climate. The inner side of the chamber is set at T = 23 ℃ and different variations of water relative humidity between 40–95% are applied. The results show that the hygroscopic impact of the insulating material set behind a OSB is very limited. The inner relative humidity is mostly absorbed and released by the OSB board that acted both as water vapor barrier and moisture buffer. Characterizations and real tests show that the moisture buffering capacity of clay is slightly higher than gypsum.
In the second part, summer thermal phase shifts tests are performed with either conventional mineral wool or wood wool, and either gypsum or clay inner panels. In the outer side of the chamber temperature cycles of 24 h are applied (T = 15–40–15 ℃). The temperature in the inner side is not monitored. The results show that wall made with wood wool and clay have higher thermal phase shift than wall made with mineral wool and gypsum. The highest impact is due to the use of a panel of clay instead of gypsum. The type of insulation has limited influence. The maximum difference between the two walls is 0.9 ℃, which corresponds to an increase of performance of about ~5%. This value of ~5% is similar to the conclusion obtained by previous modellings performed by the BBRI and the EMPA. In order to prevent summer overheating, one should at first guarantee overnight ventilation and sunscreen during the daytime, and thereafter care about the type of insulating material.
Hygroscopic and Thermal Inertia Impact of Biobased Insulation in a Wood Frame Wall
In this study, large scale experiments are performed with walls implemented in a climatic chamber in order to assess either the hygroscopic impact or the thermal phase shift of flexible bio-based insulating materials and clay panels. The conditions are set to be as close as possible to the field. Before the large scale tests, the materials are characterized individually with moisture-buffering, sorption-desorption and water vapour permeability tests.
The aim of the first part is to assess the moisture buffering ability of a flexible bio-based insulating material set behind a OSB board. Conventional mineral wool (rock wool) is set inside wall n°1 and flax is set inside wall n°2. The outer side of the chamber is set at T = 5 ℃/RH = 80% in order to simulate winter climate. The inner side of the chamber is set at T = 23 ℃ and different variations of water relative humidity between 40–95% are applied. The results show that the hygroscopic impact of the insulating material set behind a OSB is very limited. The inner relative humidity is mostly absorbed and released by the OSB board that acted both as water vapor barrier and moisture buffer. Characterizations and real tests show that the moisture buffering capacity of clay is slightly higher than gypsum.
In the second part, summer thermal phase shifts tests are performed with either conventional mineral wool or wood wool, and either gypsum or clay inner panels. In the outer side of the chamber temperature cycles of 24 h are applied (T = 15–40–15 ℃). The temperature in the inner side is not monitored. The results show that wall made with wood wool and clay have higher thermal phase shift than wall made with mineral wool and gypsum. The highest impact is due to the use of a panel of clay instead of gypsum. The type of insulation has limited influence. The maximum difference between the two walls is 0.9 ℃, which corresponds to an increase of performance of about ~5%. This value of ~5% is similar to the conclusion obtained by previous modellings performed by the BBRI and the EMPA. In order to prevent summer overheating, one should at first guarantee overnight ventilation and sunscreen during the daytime, and thereafter care about the type of insulating material.
Hygroscopic and Thermal Inertia Impact of Biobased Insulation in a Wood Frame Wall
RILEM Bookseries
Amziane, Sofiane (editor) / Merta, Ildiko (editor) / Page, Jonathan (editor) / Claude, Vincent (author) / Nguyen, Evelyne (author) / Delhaye, André (author) / Mayeux, Antonin (author) / Charron, Stéphane (author)
International Conference on Bio-Based Building Materials ; 2023 ; Vienna, Austria
2023-06-14
18 pages
Article/Chapter (Book)
Electronic Resource
English
Laboratory Testing for Daily Hygroscopic Inertia Assessment
| British Library Conference Proceedings | 2008