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Open AccessArticle

Study of the Hygrothermal Behavior of Wood Fiber Insulation Subjected to Non-Isothermal Loading

1
Univ Lyon, CNRS, INSA-Lyon, Université Claude Bernard Lyon 1, CETHIL UMR5008, F-69621 Villeurbanne, France
2
Industrial and Systems Engineering Graduate Program (PPGEPS), Polytechnic School (EP), Pontifical Catholic University of Parana (PUCPR), Rua Imaculada Conceição 1555, Curitiba 80215-901, Brazil
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(11), 2359; https://doi.org/10.3390/app9112359
Received: 10 May 2019 / Revised: 2 June 2019 / Accepted: 3 June 2019 / Published: 9 June 2019
Building envelopes are constantly subjected to temperature and moisture gradients. This loading induces a complex response, particularly for highly hygroscopic insulating materials. Latent effects can no longer be neglected for these materials in which heat and moisture transfers are strongly coupled. The purpose of this article is to analyze the behavior of a wood fiber insulation subjected to non-isothermal loading under a vapor concentration gradient. An experimental setup and a mathematical model of hygrothermal transfer were developed to analyze the behavior of the wall. The mathematical model describes the main physical phenomena involved, notably water vapor adsorption and the dependence of thermophysical properties in state variables. The experimental setup developed allows studying a wall under controlled conditions. The temperature and relative humidity profiles within the wall were measured. The evolution of the profiles with time suggests that the adsorption of the water vapor occurs together with the redistribution of liquid water within the envelope. The comparison of the experimental results with the numerical model shows good agreement although the prediction can be improved during the transient phase. The comparisons of these results with a purely diffusive thermal transfer model show the limits of the latter and permit quantifying the latent effects on the total heat transfer. View Full-Text
Keywords: heat and mass transfers; hygrothermal coupling; wood fiber insulation; water vapor adsorption; latent effects heat and mass transfers; hygrothermal coupling; wood fiber insulation; water vapor adsorption; latent effects
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MDPI and ACS Style

Slimani, Z.; Trabelsi, A.; Virgone, J.; Zanetti Freire, R. Study of the Hygrothermal Behavior of Wood Fiber Insulation Subjected to Non-Isothermal Loading. Appl. Sci. 2019, 9, 2359.

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