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{"id":156,"date":"2009-06-23T13:59:33","date_gmt":"2009-06-23T11:59:33","guid":{"rendered":"https:\/\/energethique.be\/?p=156"},"modified":"2013-03-23T22:23:28","modified_gmt":"2013-03-23T20:23:28","slug":"cours-theorique-lenergie-grise","status":"publish","type":"post","link":"https:\/\/energethique.be\/2009\/cours-theorique-lenergie-grise\/","title":{"rendered":"Cours th\u00e9orique : l’\u00e9nergie grise"},"content":{"rendered":"

Mais qu’est-ce donc que l’\u00e9nergie grise d’un mat\u00e9riau\/produit ?<\/p>\n

Alors l’\u00e9nergie grise, dont on parle de plus en plus actuellement, c’est l’\u00e9nergie qui a \u00e9t\u00e9 n\u00e9cessaire pour la production d’un produit fini, son utilisation et enfin son recyclage.<\/p>\n

On peut voir \u00e7a comme la dette \u00e9nerg\u00e9tique d’un produit.<\/p>\n

L’\u00e9nergie grise est donc g\u00e9n\u00e9ralement la somme de :
\n– L’\u00e9nergie d\u00e9pens\u00e9e lors de la conception du produit ou du service
\n– L’extraction et le transport des mati\u00e8res premi\u00e8res
\n– La pr\u00e9paration des mati\u00e8res premi\u00e8res avant leur utilisation
\n– La fabrication du produit\/Mise en place du service
\n– La commercialisation du produit\/service
\n– L’utilisation et la maintenance du produit\/service
\n– Le recyclage<\/p>\n

<\/p>\n

Plus l’\u00e9nergie grise d’un produit sera basse, moins il aura fallu d’\u00e9nergie pour le produire et l’utiliser !<\/p>\n

Cela permet de se rendre compte par exemple qu’une canette d’aluminium non recycl\u00e9, demande la m\u00eame \u00e9nergie que le lavage, l’\u00e9tiquetage et le remplissage de 8 bouteilles en verre de m\u00eame contenance, on vous parlait d\u00e9j\u00e0 des fameuses canettes ici<\/a>.<\/p>\n

L’\u00e9nergie grise est \u00e9galement primordiale quand on parle de la production d’\u00e9lectricit\u00e9 \u00e0 partir de renouvelable. <\/p>\n

Un panneau solaire, par exemple, rembourse sa dette \u00e9nerg\u00e9tique en 2-3 ans environ. Sachant que celui-ci va fonctionner au moins 20 ans, on esp\u00e8re gagner presque 10 fois plus d’\u00e9nergie qu’il n’en a fallu pour le construire !<\/p>\n

Il faudra entre 2 et 6 mois \u00e0 une \u00e9olienne pour rembourser sa dette \u00e9nerg\u00e9tique et on esp\u00e8re qu’elle produira entre 50 et 80 fois l’\u00e9nergie n\u00e9cessaire pour la construire. Cela para\u00eet \u00e9norme par rapport au photovolta\u00efque, mais ce dernier a pour l’instant des performances encore m\u00e9diocre (9-17%) et surtout les mat\u00e9riaux utilis\u00e9s sont plus rares que ceux utilis\u00e9s dans la construction d’une \u00e9olienne.<\/p>\n

Enfin, la filiale nucl\u00e9aire rembourse sa dette \u00e9nerg\u00e9tique en moins d’un an, \u00e7a fait d’elle la championne de la discipline ! Je ne veux pas dire par l\u00e0 que c’est la meilleure sur tous les plans, loin de l\u00e0, l’\u00e9nergie grise en r\u00e9alit\u00e9 a pour d\u00e9faut de ne pr\u00e9senter qu’un aspect \u00e9nerg\u00e9tique, n\u00e9gligeant la pr\u00e9servation de l’environnement ou les d\u00e9chets par exemple.<\/p>\n

Ce qui est dommage, c’est que l’\u00e9nergie grise est bien souvent compliqu\u00e9e \u00e0 calculer, surtout pour le consommateur final qui ne conna\u00eet pas l’enti\u00e8ret\u00e9 de la cha\u00eene et n’a bien souvent pas le temps de se pencher sur la question. Il serait int\u00e9ressant de pouvoir conna\u00eetre l’\u00e9nergie grise des produits que l’on ach\u00e8te, peut-\u00eatre pas des produits de tous les jours certes, mais ce serait tr\u00e8s int\u00e9ressant pour les voitures. En effet, si notre voiture consomme 0,5 l\/100km en moins qu’une autre, c’est un plus, mais si elle a n\u00e9cessit\u00e9 3 fois plus d’\u00e9nergie \u00e0 la production, c’est peut-\u00eatre tout de suite moins \u00e9cologique \ud83d\ude09<\/p>\n

Alors, l’\u00e9nergie grise maintenant, \u00e7a vous parle ?<\/p>\n","protected":false},"excerpt":{"rendered":"

Mais qu’est-ce donc que l’\u00e9nergie grise d’un mat\u00e9riau\/produit ?<\/p>\n

Alors l’\u00e9nergie grise, dont on parle de plus en plus actuellement, c’est l’\u00e9nergie qui a \u00e9t\u00e9 n\u00e9cessaire pour la production d’un produit fini, son utilisation et enfin son recyclage.<\/p>\n

On peut voir \u00e7a comme la dette \u00e9nerg\u00e9tique d’un produit.<\/p>\n

L’\u00e9nergie grise est donc g\u00e9n\u00e9ralement la somme de :
\n– L’\u00e9nergie d\u00e9pens\u00e9e lors de la conception du produit ou du service
\n– L’extraction et le transport des mati\u00e8res premi\u00e8res
\n– La pr\u00e9paration des mati\u00e8res premi\u00e8res avant leur utilisation
\n– […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[7],"tags":[],"jetpack_featured_media_url":"","jetpack_publicize_connections":[],"jetpack_shortlink":"https:\/\/wp.me\/pBGwz-2w","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/energethique.be\/wp-json\/wp\/v2\/posts\/156"}],"collection":[{"href":"https:\/\/energethique.be\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/energethique.be\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/energethique.be\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/energethique.be\/wp-json\/wp\/v2\/comments?post=156"}],"version-history":[{"count":0,"href":"https:\/\/energethique.be\/wp-json\/wp\/v2\/posts\/156\/revisions"}],"wp:attachment":[{"href":"https:\/\/energethique.be\/wp-json\/wp\/v2\/media?parent=156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/energethique.be\/wp-json\/wp\/v2\/categories?post=156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/energethique.be\/wp-json\/wp\/v2\/tags?post=156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}