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Deprecated: strip_tags(): Passing null to parameter #1 ($string) of type string is deprecated in /home/clients/e059f69c34c04b3fd572f3bfdd2ae520/web/isolant.php on line 11 Calcul de coefficient thermiques. Isolants U,R & Lambda
Ici lien sur un PDF publié par le site du canton de Vaud (Suisse) avec les récaputilatids de valeur U max selon la norme SIA 380/1 édition 2009 ,
mais en gros Umax = 0.20=> Tableau ici <=
ou copie en local Tableau ici <=
La formule du calcul thermique peut être simplifiée de la manière suivante.
et
Les résistances thermiques s'additionnent.
Plus U est bas, plus c'est isolé (moins de perte de Watt par degré de différence de température).
Pour le matériel, plus le Lambda est bas, plus il a un pouvoir isolant.
Quelques valeures Lambda de références : [W/(m.ºC)]
Laine de verre
0.035
Laine de pierre
0.040
Polystryrène expansé
0.035
Polystryrène expansé performant
0.022
Bois
0.12
Béton cellulaire
0.20
Placo-plâtre
0.25
Brique réfractaire pleine
0.96
Chape ciment
1.4
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