{"id":1923,"date":"2024-11-14T16:24:05","date_gmt":"2024-11-14T16:24:05","guid":{"rendered":"https:\/\/ikoknowledgecenter.com\/docs\/uncategorized\/comment-sexprime-la-performance-thermique-dun-materiau-isolant\/"},"modified":"2025-05-05T10:53:14","modified_gmt":"2025-05-05T10:53:14","password":"","slug":"comment-sexprime-la-performance-thermique-dun-materiau-isolant","status":"publish","type":"docs","link":"https:\/\/ikoknowledgecenter.com\/fr\/docs\/isolation\/comment-sexprime-la-performance-thermique-dun-materiau-isolant\/","title":{"rendered":"Comment s’exprime la performance thermique d’un mat\u00e9riau isolant ?"},"content":{"rendered":"\n

La performance thermique d’un produit isolant peut \u00eatre exprim\u00e9e en diff\u00e9rentes unit\u00e9s. Voici un bref aper\u00e7u ci-dessous :<\/p>\n\n

\n
\n
<\/td>L’unit\u00e9<\/mark><\/td><\/tr>
Lambda <\/strong><\/td>W\/m.K<\/td><\/tr>
Valeur Rd<\/td>(m\u00b2.K)\/W<\/td><\/tr>
Valeur Rc<\/td>(m\u00b2.K)\/W<\/td><\/tr>
Valeur U<\/td>W\/(m\u00b2.K)<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n\n
\n
Signification<\/mark><\/td><\/tr>
\u00a0\u00a0La conductivit\u00e9 thermique \u03bb exprime la quantit\u00e9 d’\u00e9nergie par seconde qui traverse une surface de 1 m\u00b2 avec une \u00e9paisseur de 1 m, pour une diff\u00e9rence de temp\u00e9rature de 1 Kelvin entre les deux c\u00f4t\u00e9s de la surface.<\/td><\/tr>
R\u00e9sistance thermique d’un mat\u00e9riau (R d\u00e9clar\u00e9e)R = d \/ \u03bb<\/em>\u00a0<\/em>D = \u00e9paisseur du mat\u00e9riau en m<\/em>\u03bb = conductivit\u00e9 thermique du mat\u00e9riau<\/em><\/td><\/tr>
R\u00e9sistance thermique d’une construction (R construction)Rc = somme des valeurs Rd des diff\u00e9rentes couches de la construction + Rsi et Rse (r\u00e9sistance \u00e0 l’\u00e9change thermique \u00e0 l’int\u00e9rieur \/ \u00e0 l’ext\u00e9rieur)<\/td><\/tr>
Coefficient de transmission thermique<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n\n
\n
Explication<\/mark><\/td><\/tr>
Plus le coefficient de conductivit\u00e9 thermique est faible, meilleures seront les performances thermiques d’un produit isolant. Une couche d’isolation plus performante sera caract\u00e9ris\u00e9e par une valeur lambda plus basse.<\/td><\/tr>
Plus la r\u00e9sistance thermique d’une construction est \u00e9lev\u00e9e, meilleures seront les performances thermiques de la construction. Une couche d’isolation plus performante entra\u00eenera donc une valeur R plus \u00e9lev\u00e9e.<\/td><\/tr>
Plus la r\u00e9sistance thermique d’une construction est \u00e9lev\u00e9e, meilleures seront les performances thermiques de la construction. Une couche d’isolation plus performante entra\u00eenera donc une valeur R plus \u00e9lev\u00e9e.<\/td><\/tr>
Plus la r\u00e9sistance thermique d’une construction est \u00e9lev\u00e9e, meilleures seront les performances thermiques de la construction. Une couche d’isolation plus performante entra\u00eenera donc une valeur R plus \u00e9lev\u00e9e.<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

La performance thermique d’un produit isolant peut \u00eatre exprim\u00e9e en diff\u00e9rentes unit\u00e9s. Voici un bref aper\u00e7u ci-dessous : L’unit\u00e9 Lambda W\/m.K Valeur Rd (m\u00b2.K)\/W Valeur Rc (m\u00b2.K)\/W Valeur U W\/(m\u00b2.K) Signification \u00a0 \u00a0 La conductivit\u00e9 thermique \u03bb exprime la quantit\u00e9 d’\u00e9nergie par seconde qui traverse une surface de 1 m\u00b2 avec une \u00e9paisseur de 1 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"doc_category":[105],"doc_tag":[718,717,713,693,761,688,705],"glossaries":[],"class_list":["post-1923","docs","type-docs","status-publish","hentry","doc_category-isolation","doc_tag-capacite-isolation","doc_tag-conductivite-thermique","doc_tag-degre-isolation","doc_tag-performance-energetique","doc_tag-physique-batiment","doc_tag-valeur-isolation","doc_tag-valeur-lambda"],"year_month":"2026-10","word_count":262,"total_views":"266","reactions":{"happy":"0","normal":"0","sad":"0"},"author_info":{"name":"Luna Degraeve","author_nicename":"luna","author_url":"https:\/\/ikoknowledgecenter.com\/fr\/author\/luna\/"},"doc_category_info":[{"term_name":"Isolation","term_url":"https:\/\/ikoknowledgecenter.com\/fr\/docs-category\/isolation\/"}],"doc_tag_info":[{"term_name":"capacit\u00e9 isolation","term_url":"https:\/\/ikoknowledgecenter.com\/fr\/docs-tag\/capacite-isolation\/"},{"term_name":"conductivit\u00e9 thermique","term_url":"https:\/\/ikoknowledgecenter.com\/fr\/docs-tag\/conductivite-thermique\/"},{"term_name":"degr\u00e9 d'isolation","term_url":"https:\/\/ikoknowledgecenter.com\/fr\/docs-tag\/degre-isolation\/"},{"term_name":"performance \u00e9nerg\u00e9tique","term_url":"https:\/\/ikoknowledgecenter.com\/fr\/docs-tag\/performance-energetique\/"},{"term_name":"physique du b\u00e2timent","term_url":"https:\/\/ikoknowledgecenter.com\/fr\/docs-tag\/physique-batiment\/"},{"term_name":"valeur d'isolation","term_url":"https:\/\/ikoknowledgecenter.com\/fr\/docs-tag\/valeur-isolation\/"},{"term_name":"valeur lambda","term_url":"https:\/\/ikoknowledgecenter.com\/fr\/docs-tag\/valeur-lambda\/"}],"knowledge_base_info":[],"knowledge_base_slug":[],"_links":{"self":[{"href":"https:\/\/ikoknowledgecenter.com\/fr\/wp-json\/wp\/v2\/docs\/1923","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ikoknowledgecenter.com\/fr\/wp-json\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/ikoknowledgecenter.com\/fr\/wp-json\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/ikoknowledgecenter.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ikoknowledgecenter.com\/fr\/wp-json\/wp\/v2\/comments?post=1923"}],"version-history":[{"count":3,"href":"https:\/\/ikoknowledgecenter.com\/fr\/wp-json\/wp\/v2\/docs\/1923\/revisions"}],"predecessor-version":[{"id":2884,"href":"https:\/\/ikoknowledgecenter.com\/fr\/wp-json\/wp\/v2\/docs\/1923\/revisions\/2884"}],"wp:attachment":[{"href":"https:\/\/ikoknowledgecenter.com\/fr\/wp-json\/wp\/v2\/media?parent=1923"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/ikoknowledgecenter.com\/fr\/wp-json\/wp\/v2\/doc_category?post=1923"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/ikoknowledgecenter.com\/fr\/wp-json\/wp\/v2\/doc_tag?post=1923"},{"taxonomy":"glossaries","embeddable":true,"href":"https:\/\/ikoknowledgecenter.com\/fr\/wp-json\/wp\/v2\/glossaries?post=1923"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}