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Une conduite de vapeur de diamtre extrieur gal 80 mm est entoure d'une couche de ciment de conductivit thermique gale 0,48 W.m-1 .K-1 . Calculer

Une conduite de vapeur de diamtre extrieur gal 80 mm est entoure d'une couche de ciment de conductivit thermique gale 0,48 W.m-1 .K-1 . Calculer l'paisseur minimale de ciment permettant de rduire les pertes. On donne h = 8 W.m-2 .K-1

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