{"id":42749,"date":"2019-10-06T22:47:51","date_gmt":"2019-10-06T21:47:51","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-lisolation-en-mousse-pulverisee-definition\/"},"modified":"2020-02-05T10:37:21","modified_gmt":"2020-02-05T09:37:21","slug":"quest-ce-que-lisolation-en-mousse-pulverisee-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-lisolation-en-mousse-pulverisee-definition\/","title":{"rendered":"Qu&#8217;est-ce que l&#8217;isolation en mousse pulv\u00e9ris\u00e9e &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">L&#8217;isolation en mousse \u00e0 pulv\u00e9riser est un type d&#8217;isolant qui est pulv\u00e9ris\u00e9 en place \u00e0 l&#8217;aide d&#8217;un pistolet.\u00a0La mousse isolante en spray peut \u00eatre souffl\u00e9e dans les murs, sur les dalles de b\u00e9ton, sur les surfaces de grenier.\u00a0G\u00e9nie thermique<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Isolation en mousse pulv\u00e9ris\u00e9e<\/h2>\n<p><strong>L&#8217;isolation en mousse \u00e0 pulv\u00e9riser<\/strong>\u00a0est un type d&#8217;isolant qui est pulv\u00e9ris\u00e9 en place \u00e0 l&#8217;aide d&#8217;un pistolet.\u00a0<strong>L&#8217;isolation en mousse pulv\u00e9ris\u00e9e<\/strong>\u00a0peut \u00eatre insuffl\u00e9e dans les murs, sur les dalles de b\u00e9ton, sur les surfaces de grenier ou sous les sols pour isoler et r\u00e9duire les fuites d&#8217;air.\u00a0<strong>La mousse pulv\u00e9ris\u00e9e<\/strong>\u00a0peut remplir m\u00eame les plus petites cavit\u00e9s, cr\u00e9ant ainsi un pare-air efficace.\u00a0La mousse gonfle g\u00e9n\u00e9ralement jusqu&#8217;\u00e0 30 \u00e0 60 fois son volume de liquide une fois pulv\u00e9ris\u00e9e sur place.\u00a0Il offre une excellente r\u00e9sistance \u00e0 l&#8217;infiltration d&#8217;air (\u00e0 la diff\u00e9rence des tapis et des couvertures, qui peuvent laisser des d\u00e9viations et des poches d&#8217;air, et qui sont sup\u00e9rieurs \u00e0 certains types de remplissage en vrac).\u00a0D&#8217;autre part, le co\u00fbt de l&#8217;isolation en mousse pulv\u00e9ris\u00e9e peut \u00eatre sup\u00e9rieur \u00e0 celui de l&#8217;isolant traditionnel et la plupart des mousses, \u00e0 l&#8217;exception des mousses \u00e0 base de ciment, d\u00e9gagent des fum\u00e9es toxiques lorsqu&#8217;elles br\u00fblent.<\/p>\n<p>Il existe deux types d\u2019isolants en mousse pulv\u00e9ris\u00e9e:<\/p>\n<ul>\n<li><strong>Mousse \u00e0 cellules ferm\u00e9es<\/strong>\u00a0.\u00a0Les mousses \u00e0 cellules ferm\u00e9es sont de meilleurs isolants.\u00a0Leurs cellules haute densit\u00e9 sont ferm\u00e9es et remplies d&#8217;un gaz qui aide la mousse \u00e0 se dilater pour remplir les espaces qui l&#8217;entourent.\u00a0La mousse \u00e0 cellules ferm\u00e9es est tr\u00e8s solide et renforce structurellement la surface isol\u00e9e.<\/li>\n<li><strong>Mousse \u00e0 cellules ouvertes<\/strong>\u00a0.\u00a0Les cellules en mousse \u00e0 cellules ouvertes ne sont pas aussi denses et sont remplies d&#8217;air, ce qui conf\u00e8re \u00e0 l&#8217;isolation une texture spongieuse.\u00a0La mousse \u00e0 cellules ouvertes est poreuse, permettant \u00e0 la vapeur d\u2019eau et \u00e0 l\u2019eau liquide de p\u00e9n\u00e9trer dans l\u2019isolant.\u00a0D&#8217;autre part, les mousses \u00e0 cellules ouvertes vont permettre au bois de structure de respirer et elles sont environ deux fois plus efficaces en tant que barri\u00e8re acoustique.<\/li>\n<\/ul>\n<p>Les mat\u00e9riaux d&#8217;isolation en mousse disponibles incluent:<\/p>\n<ul>\n<li>Ciment<\/li>\n<li>Ph\u00e9nolique<\/li>\n<li><a title=\"Mousse de polyisocyanurate\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/insulation-materials\/polyisocyanurate-foam\/\">Polyisocyanurate<\/a><\/li>\n<li><a title=\"Mousse de polyurethane\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/insulation-materials\/polyurethane-foam\/\">Polyur\u00e9thane<\/a>\u00a0.<\/li>\n<\/ul>\n<p>La plupart sont g\u00e9n\u00e9ralement fabriqu\u00e9s avec du polyur\u00e9thane ou de l&#8217;isocyanate.\u00a0Les mousses \u00e0 base de ciment sont similaires et peuvent \u00eatre appliqu\u00e9es de la m\u00eame mani\u00e8re mais ne se dilatent pas.\u00a0Ces mousses ont une r\u00e9sistance au feu sup\u00e9rieure \u00e0 celle des mousses de polyur\u00e9thane ou d&#8217;isocyanate.<\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<h2><span>Isolation de grenier &#8211; Isolation de toit<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Polyurethane-thermal-insulation.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-21152 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Polyurethane-thermal-insulation-300x201.png\" alt=\"Mousse de polyur\u00e9thane - isolation thermique\" width=\"300\" height=\"201\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Polyurethane-thermal-insulation-300x201.png\" \/><\/a><span>Une source tr\u00e8s importante de\u00a0<\/span><strong><span>perte<\/span><\/strong><span>\u00a0de\u00a0<strong>chaleur<\/strong>\u00a0d&#8217;une maison est le\u00a0<\/span><strong><span>toit<\/span><\/strong><span>\u00a0et le\u00a0<\/span><strong><span>grenier<\/span><\/strong><span>\u00a0.\u00a0<\/span><strong><span>L&#8217;isolation du grenier<\/span><\/strong><span>\u00a0est une proc\u00e9dure de rev\u00eatement int\u00e9rieur de protection isol\u00e9e thermiquement impliquant l&#8217;utilisation de laine de verre ou de roche, de mousse de polyur\u00e9thane ou de mousse ph\u00e9nolique.\u00a0Il faut noter qu&#8217;il y a une diff\u00e9rence entre l&#8217;isolation d&#8217;un toit en pente et un toit plat, et il y a une diff\u00e9rence entre l&#8217;isolation d&#8217;un loft froid ou chaud.\u00a0Une isolation de toit froide n\u00e9cessite une isolation au niveau des solives pour emp\u00eacher la chaleur de s&#8217;\u00e9chapper \u00e0 travers l&#8217;espace de toit inutilis\u00e9.\u00a0Un toit chaud est isol\u00e9 entre et sous les chevrons du toit lui-m\u00eame.<\/span><\/p>\n<p><span>Le but de l&#8217;\u00a0<\/span><strong><span>isolation<\/span><\/strong><span>\u00a0du\u00a0<strong>toit<\/strong>\u00a0est de r\u00e9duire le coefficient global de transfert de chaleur en ajoutant des mat\u00e9riaux \u00e0 faible conductivit\u00e9 thermique. \u00a0<\/span><strong><span>L&#8217;isolation de la toiture et du grenier des<\/span><\/strong><span>\u00a0b\u00e2timents est un facteur important pour assurer le confort thermique de ses occupants.\u00a0L&#8217;isolation du toit ainsi que d&#8217;autres types d&#8217;isolation r\u00e9duisent les pertes de chaleur ind\u00e9sirables et r\u00e9duisent \u00e9galement les gains de chaleur ind\u00e9sirables.\u00a0Ils peuvent r\u00e9duire consid\u00e9rablement les besoins \u00e9nerg\u00e9tiques des syst\u00e8mes de chauffage et de refroidissement.\u00a0Il faut l&#8217;ajouter, aucun mat\u00e9riau ne peut emp\u00eacher compl\u00e8tement les pertes de chaleur, les pertes de chaleur ne peuvent \u00eatre que minimis\u00e9es.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Exemple d&#8217;isolation &#8211; mousse de polyur\u00e9thane<\/span><\/h2>\n<p><a title=\"Mousse de polyurethane\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/insulation-materials\/polyurethane-foam\/\"><strong><span>La mousse de polyur\u00e9thane (PUR)<\/span><\/strong><\/a><span>\u00a0\u00a0est un polym\u00e8re thermodurci \u00e0 cellules ferm\u00e9es.\u00a0Les polym\u00e8res de polyur\u00e9thanne sont traditionnellement et le plus souvent form\u00e9s en faisant r\u00e9agir un di- ou poly-isocyanate avec un polyol.\u00a0<\/span><strong><span>L&#8217;isolation en mousse de polyur\u00e9thane<\/span><\/strong><span>\u00a0\u00a0est disponible en formules \u00e0 cellules ferm\u00e9es et \u00e0 cellules ouvertes.\u00a0La mousse de polyur\u00e9thane peut \u00eatre utilis\u00e9e comme isolation de murs creux ou comme isolation de toiture, isolation de sol, isolation de tuyaux, isolation d&#8217;installations industrielles.\u00a0Des panneaux isolants en PUR peuvent \u00eatre appliqu\u00e9s sur tous les \u00e9l\u00e9ments de l&#8217;enveloppe du b\u00e2timent.\u00a0Un autre aspect important est que le PUR peut \u00e9galement \u00eatre inject\u00e9 dans les parois des cavit\u00e9s existantes, en utilisant les ouvertures existantes et certains trous suppl\u00e9mentaires.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Exemple &#8211; Perte de chaleur \u00e0 travers un mur<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/heat-loss-through-wall-example-calculation.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-21148 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/heat-loss-through-wall-example-calculation-169x300.png\" alt=\"perte de chaleur \u00e0 travers le mur - exemple - calcul\" width=\"169\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/heat-loss-through-wall-example-calculation-169x300.png\" \/><\/a><span>Les\u00a0\u00a0murs constituent une\u00a0source majeure de\u00a0<\/span><strong><span>perte<\/span><\/strong><span>\u00a0de\u00a0\u00a0<strong>chaleur<\/strong>\u00a0dans une maison.\u00a0Calculez le taux de\u00a0<\/span><a title=\"Densit\u00e9 de flux thermique - Flux thermique\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/heat-flux-density-thermal-flux\/\"><span>flux<\/span><\/a><span>\u00a0de\u00a0\u00a0<a title=\"Densit\u00e9 de flux thermique - Flux thermique\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/heat-flux-density-thermal-flux\/\">chaleur \u00e0<\/a>\u00a0\u00a0travers un mur de 3 mx 10 m (A = 30 m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0).\u00a0Le mur a une \u00e9paisseur de 15 cm (L\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0) et il est fait de briques avec\u00a0\u00a0<\/span><a title=\"Conductivit\u00e9 thermique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-conductivite-thermique-definition\/\"><span>une conductivit\u00e9 thermique<\/span><\/a><span>\u00a0\u00a0de k\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0\u00a0= 1,0 W \/ mK (mauvais isolant thermique).\u00a0Supposons que les\u00a0<\/span><a title=\"Qu'est-ce que la temp\u00e9rature - Physique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-temperature-physique-definition\/\"><span>temp\u00e9ratures<\/span><\/a><span>\u00a0int\u00e9rieure et ext\u00e9rieure\u00a0\u00a0\u00a0sont de 22 \u00b0 C et -8 \u00b0 C et que les\u00a0\u00a0<\/span><a title=\"Coefficient de transfert de chaleur par convection\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-quun-coefficient-de-transfert-de-chaleur-par-convection-definition\/\"><span>coefficients de transfert de chaleur par convection<\/span><\/a><span>\u00a0\u00a0sur les c\u00f4t\u00e9s int\u00e9rieur et ext\u00e9rieur sont h\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0\u00a0= 10 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0K et h\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0\u00a0= 30 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>K, respectivement.\u00a0A noter que ces coefficients de convection d\u00e9pendent fortement notamment des conditions ambiantes et int\u00e9rieures (vent, humidit\u00e9, etc.).<\/span><\/p>\n<ol>\n<li><span>Calculez le flux de chaleur (\u00a0<\/span><a title=\"Pertes de chaleur\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/\"><strong><span>perte de chaleur<\/span><\/strong><\/a><span>\u00a0) \u00e0 travers ce mur non isol\u00e9.<\/span><\/li>\n<li><span>Supposons maintenant\u00a0\u00a0<\/span><strong><span>une isolation thermique<\/span><\/strong><span>\u00a0\u00a0sur le c\u00f4t\u00e9 ext\u00e9rieur de ce mur.\u00a0Utilisez une\u00a0\u00a0<\/span><strong><span>isolation en mousse de polyur\u00e9thane de\u00a0<\/span><\/strong><span>\u00a010 cm d&#8217;\u00e9paisseur (L\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0) avec une conductivit\u00e9 thermique de k\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0\u00a0= 0,028 W \/ mK et calculez le flux de\u00a0<\/span><a title=\"Pertes de chaleur\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/\"><strong><span>chaleur<\/span><\/strong><\/a><span>\u00a0(\u00a0<a title=\"Pertes de chaleur\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/heat-losses\/\"><strong>perte de chaleur<\/strong><\/a>\u00a0) \u00e0 travers ce mur composite.<\/span><\/li>\n<\/ol>\n<p><strong><span>Solution:<\/span><\/strong><\/p>\n<p><span>Comme cela a \u00e9t\u00e9 \u00e9crit, de nombreux processus de transfert de chaleur impliquent des syst\u00e8mes composites et impliquent m\u00eame une combinaison de\u00a0\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-conduction-thermique-conduction-thermique-definition\/\"><span>conduction<\/span><\/a><span>\u00a0\u00a0et de\u00a0\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-convection-transfert-de-chaleur-par-convection-definition\/\"><span>convection<\/span><\/a><span>\u00a0.\u00a0Avec ces syst\u00e8mes composites, il est souvent commode de travailler avec un\u00a0<\/span><strong><a title=\"Coefficient global de transfert de chaleur - facteur U\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-le-coefficient-global-de-transfert-de-chaleur-facteur-u-definition\/\"><span>\u00a0coefficient global de transfert de chaleur<\/span><\/a><span>\u00a0,\u00a0<\/span><\/strong><span>\u00a0connu comme un\u00a0\u00a0<\/span><strong><span>facteur U<\/span><\/strong><span>\u00a0.\u00a0Le facteur U est d\u00e9fini par une expression analogue \u00e0\u00a0\u00a0<\/span><a title=\"Loi de Newton sur le refroidissement\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quelle-est-la-loi-de-newton-sur-le-refroidissement-definition\/\"><strong><span>la loi de Newton du refroidissement<\/span><\/strong><\/a><span>\u00a0:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/u-factor-overall-heat-transfer-coefficient.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20390 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/u-factor-overall-heat-transfer-coefficient.png\" alt=\"facteur u - coefficient global de transfert de chaleur\" width=\"314\" height=\"136\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/u-factor-overall-heat-transfer-coefficient.png\" \/><\/a><\/p>\n<p><span>Le\u00a0\u00a0<\/span><strong><span>coefficient global de transfert de chaleur<\/span><\/strong><span>\u00a0\u00a0est li\u00e9 \u00e0 la\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-resistance-thermique-resistivite-thermique-definition\/\"><span>\u00a0r\u00e9sistance thermique totale<\/span><\/a><span>\u00a0\u00a0et d\u00e9pend de la g\u00e9om\u00e9trie du probl\u00e8me.<\/span><\/p>\n<ol>\n<li><strong><span>mur nu<\/span><\/strong><\/li>\n<\/ol>\n<p><span>En supposant un transfert de chaleur unidimensionnel \u00e0 travers la paroi plane et sans tenir compte du rayonnement, le\u00a0\u00a0<\/span><strong><span>coefficient de transfert de chaleur global<\/span><\/strong><span>\u00a0\u00a0peut \u00eatre calcul\u00e9 comme suit:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-heat-loss-calculation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-21160 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-heat-loss-calculation.png\" alt=\"coefficient global de transfert de chaleur - calcul des pertes de chaleur\" width=\"343\" height=\"200\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-heat-loss-calculation.png\" \/><\/a><\/p>\n<p><span>Le\u00a0\u00a0<\/span><strong><span>coefficient global de transfert de chaleur\u00a0<\/span><\/strong><span>\u00a0est alors:<\/span><\/p>\n<p><span>U = 1 \/ (1\/10 + 0,15 \/ 1 + 1\/30) = 3,53 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0K<\/span><\/p>\n<p><span>Le flux de chaleur peut alors \u00eatre calcul\u00e9 simplement comme:<\/span><\/p>\n<p><span>q = 3,53 [W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0K] x 30 [K] = 105,9 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><\/p>\n<p><span>La perte de chaleur totale \u00e0 travers ce mur sera:<\/span><\/p>\n<p><span>q\u00a0<\/span><sub><span>perte<\/span><\/sub><span>\u00a0\u00a0= q.\u00a0A = 105,9 [W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0] x 30 [m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0] = 3177 W<\/span><\/p>\n<ol start=\"2\">\n<li><strong><span>mur composite avec isolation thermique<\/span><\/strong><\/li>\n<\/ol>\n<p><span>En supposant un transfert de chaleur unidimensionnel \u00e0 travers la paroi composite plane, aucune r\u00e9sistance de contact thermique et sans tenir compte du rayonnement, le\u00a0\u00a0<\/span><strong><span>coefficient de transfert de chaleur global<\/span><\/strong><span>\u00a0\u00a0peut \u00eatre calcul\u00e9 comme suit:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-thermal-insulation-calculation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-21159 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-thermal-insulation-calculation.png\" alt=\"coefficient global de transfert de chaleur - calcul de l'isolation thermique\" width=\"423\" height=\"211\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/overall-heat-transfer-coefficient-thermal-insulation-calculation.png\" \/><\/a><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/example-polyurethane-foam-insulation.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-21234 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/example-polyurethane-foam-insulation-170x300.png\" alt=\"isolation en mousse de polyur\u00e9thane\" width=\"170\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/example-polyurethane-foam-insulation-170x300.png\" \/><\/a><span>Le\u00a0\u00a0<\/span><strong><span>coefficient global de transfert de chaleur\u00a0<\/span><\/strong><span>\u00a0est alors:<\/span><\/p>\n<p><span>U = 1 \/ (1\/10 + 0,15 \/ 1 + 0,1 \/ 0,028 + 1\/30) = 0,259 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0K<\/span><\/p>\n<p><span>Le flux de chaleur peut alors \u00eatre calcul\u00e9 simplement comme:<\/span><\/p>\n<p><span>q = 0,259 [W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0K] x 30 [K] = 7,78 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><\/p>\n<p><span>La perte de chaleur totale \u00e0 travers ce mur sera:<\/span><\/p>\n<p><span>q\u00a0<\/span><sub><span>perte<\/span><\/sub><span>\u00a0\u00a0= q.\u00a0A = 7,78 [W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0] x 30 [m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0] = 233 W<\/span><\/p>\n<p><span>Comme on peut le voir, un ajout d&#8217;isolant thermique entra\u00eene une diminution importante des pertes de chaleur.\u00a0Il faut l&#8217;ajouter, un ajout de la prochaine couche d&#8217;isolant thermique ne provoque pas de telles \u00e9conomies.\u00a0Cela peut \u00eatre mieux vu de la m\u00e9thode de r\u00e9sistance thermique, qui peut \u00eatre utilis\u00e9e pour calculer le transfert de chaleur \u00e0 travers\u00a0\u00a0<\/span><strong><span>les murs composites<\/span><\/strong><span>\u00a0.\u00a0Le taux de transfert thermique constant entre deux surfaces est \u00e9gal \u00e0 la diff\u00e9rence de temp\u00e9rature divis\u00e9e par la\u00a0<\/span><a title=\"R\u00e9sistance thermique - R\u00e9sistivit\u00e9 thermique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-resistance-thermique-resistivite-thermique-definition\/\"><span>r\u00e9sistance thermique<\/span><\/a><span>\u00a0totale\u00a0\u00a0entre ces deux surfaces.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-resistance-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20128 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-resistance-equation.png\" alt=\"r\u00e9sistance thermique - \u00e9quation\" width=\"601\" height=\"73\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-resistance-equation.png\" \/><\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-accordion\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-arrow\" data-anchor=\"References\">\n<div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Cet article est bas\u00e9 sur la traduction 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Pour plus d&#8217;informations, voir l&#8217;article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l&#8217;adresse: translations@nuclear-power.com ou remplissez le formulaire de traduction en ligne. Nous appr\u00e9cions votre aide, nous mettrons \u00e0 jour la traduction le plus rapidement possible. Merci<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&#8217;isolation en mousse \u00e0 pulv\u00e9riser est un type d&#8217;isolant qui est pulv\u00e9ris\u00e9 en place \u00e0 l&#8217;aide d&#8217;un pistolet.\u00a0La mousse isolante en spray peut \u00eatre souffl\u00e9e dans les murs, sur les dalles de b\u00e9ton, sur les surfaces de grenier.\u00a0G\u00e9nie thermique Isolation en mousse pulv\u00e9ris\u00e9e L&#8217;isolation en mousse \u00e0 pulv\u00e9riser\u00a0est un type d&#8217;isolant qui est pulv\u00e9ris\u00e9 en &#8230; <a title=\"Qu&#8217;est-ce que l&#8217;isolation en mousse pulv\u00e9ris\u00e9e &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-lisolation-en-mousse-pulverisee-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce que l&#8217;isolation en mousse pulv\u00e9ris\u00e9e &#8211; D\u00e9finition\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce que l&#039;isolation en mousse pulv\u00e9ris\u00e9e - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"L&#039;isolation en mousse \u00e0 pulv\u00e9riser est un type d&#039;isolant qui est pulv\u00e9ris\u00e9 en place \u00e0 l&#039;aide d&#039;un pistolet. 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