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Cependant, les écarts deviennent très importants pour la séquence 10 (277 % sur le temps de décroissance, 71 % sur le débit horaire) Cela provient du fait que les conditions extérieures étaient très différentes lors de cette séquence particulière (vent fort). La faible fréquence d ,
utilisée ici comme isolant, il a été mis en évidence lors de sa mise en oeuvre que ce matériau n'était pas homogène, ce qui pouvait se traduire par de fortes variations de ses propriétés thermo-hygriques. Par contre, l'épaisseur de la couche du matériau est mieux maîtrisée. Aussi, il semble raisonnable d'utiliser une valeur de la conductivité thermique de la ouate de cellulose différente de celle de la mesure faite en laboratoire pour chercher à s'approcher des mesures expérimentales ,
Acoustique) Spécialité : Génie Civil RESUME : L'évolution actuelle des exigences en termes de performance énergétique des bâtiments a fait apparaître de nouveaux enjeux et problématiques scientifiques, dont ceux liés à l'humidité. Cette étude s'appuie sur une cellule expérimentale construite sur la technologie des maisons à ossature bois et soumise aux conditions climatiques réelles de Grenoble. L'instrumentation de ce bâtiment et le suivi de l'évolution en température et en humidité ,
La démarche de validation a été décomposée en plusieurs étapes, de manière à cibler des transferts spécifiques et d'en améliorer la modélisation Ces études localisées concernent les transferts couplés de chaleur et de masse à travers les parois solides, la modélisation des transferts de chaleur à travers une lame d'air ventilée et enfin la modélisation du renouvellement de l'air intérieur en conditions naturelles. Pour estimer la précision globale du modèle, c'est-à-dire à l'échelle du bâtiment, une séquence expérimentale a été simulée en prenant en compte l'ensemble des transferts couplés simultanément. Les performances du modèle sont discutées à partir des mesures locales, c'est-à-dire dans les parois, puis globales. La bonne concordance entre mesures et résultats de simulation permet de conclure sur la validité et la généricité de la démarche mise en oeuvre et les hypothèses de simulation. Plus particulièrement, il est apparu que l'outil de modélisation permet de prédire ,