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Simultaneous mass and heat transfer in a biodegradable bio-sourced thermal insulating material
1 : Université de Technologie de Belfort-Montbeliard
Edition, Littératures, Langages, Informatique, Arts, Didactique, Discours [Besançon] (ELLIADD)
2 : Université de Technologie de Belfort-Montbeliard
ICB, UMR 6303,
3 : Université de Lille
Institut Mines-Télécom Lille-Douai
Unlike hydrophobic materials, heat transfer in a hydrophilic material in a wet atmosphere is accompanied by mass transfer. This study deals with the thermal metrology of hydrophilic versus hydrophobic materials. An experimental approach based on the asymmetric hot plate method and a theoretical approach of coupled heat and humidity transfers are performed. The experimental results show that, at 20 °C, the thermal conductivity λ of flax fibers insulators increases up to 20% when the relative humidity RH increases from 30% to 90%, i.e. from 0.028 ±10-3 to 0.033 ±10-3 W.m-1.K-1 while λ remains constant for the hydrophobic material. This agrees with the theoretical model results
