{"id":3414,"date":"2007-12-06T09:40:00","date_gmt":"2007-12-06T09:40:00","guid":{"rendered":"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/2007\/12\/06\/un-chauffe-eau\/"},"modified":"2012-07-12T10:13:04","modified_gmt":"2012-07-12T10:13:04","slug":"un-chauffe-eau","status":"publish","type":"post","link":"https:\/\/blogs.thesocialmedia.com\/leblogenergie\/2007\/12\/06\/un-chauffe-eau\/","title":{"rendered":"Un chauffe eau hors de prix : la Pile \u00e0 combustible domestique"},"content":{"rendered":"<p><a href=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/sci0307231.jpg\"><\/a><a href=\"http:\/\/clabedan.typepad.com\/photos\/uncategorized\/2007\/12\/06\/sci0307231_2.jpg\"><img loading=\"lazy\" decoding=\"async\" height=\"206\" alt=\"Sci0307231_2\" src=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/sci0307231_2.jpg\" width=\"150\"  \/><\/a>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;<span style=\"font-size: 1.4em\">L<\/span>es Soci\u00e9t\u00e9s japonaises (<a href=\"http:\/\/www.leblogenergie.com\/2007\/11\/sanyo-largue-se.html\">Sanyo<\/a>, Nippon Oil, Matsushita, Toshiba, Ebara-Ballard, etc.) ont fait un superbe travail de d\u00e9veloppement des &quot;Polymer Electrolyte Fuel Cells ou PEFC&quot; et les ont amen\u00e9es au stade industriel. Il a fallu mettre au point le syst\u00e8me de r\u00e9forming pour faire de l&rsquo;hydrog\u00e8ne \u00e0 partir de gaz, eliminer les traces de CO, poison des catalyseurs, mettre au point les membranes rev\u00eatues de catalyseurs, assurer l&rsquo;\u00e9quilibre thermique de l&rsquo;ensemble et obtenir de l&rsquo;\u00e9lectricit\u00e9 et de l&rsquo;eau chaude: c&rsquo;est la cog\u00e9n\u00e9ration.<\/p>\n<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; Mais voil\u00e0, c&rsquo;est plut\u00f4t in FLOP. Pourquoi?<\/p>\n<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; Quand on vous parle &quot;cog\u00e9n\u00e9ration&quot; traduisez imm\u00e9diatement &quot;mauvais rendement&quot;, les technologues manquent parfois d&rsquo;honn\u00eatet\u00e9 intellectuelle. Alors pourquoi cet ensemble pr\u00e9sente-t-il un mauvais rendement?<\/p>\n<ul>\n<li>il faut r\u00e9former du m\u00e9thane et donc fournir de l&rsquo;\u00e9nergie. Rem. pour les journalistes qui \u00e9crivent des b\u00eatises : le r\u00e9forming du M\u00e9thane g\u00e9n\u00e8re du CO2, c&rsquo;est donc <u>une PAC qui fait du CO2<\/u>! Zut alors!<\/li>\n<li>pour des raisons thermodynamiques la r\u00e9action H2 + 1\/2 O2 &#8212;&#8212;&#8212;&gt; H2O est fortement exothermique et c&rsquo;est cette r\u00e9action qui est r\u00e9alis\u00e9e dans une PAC \u00e0 hydrog\u00e8ne. Le &quot;potentiel de chaleur nulle&quot; de cette r\u00e9action ou de sa sym\u00e9trique qui est l&rsquo;\u00e9lectrolyse de l&rsquo;eau se situe \u00e0 1,48 Volts. ( La loi de Nernst permet de calculer un potentiel d&rsquo;\u00e9quilibre de 1,23V auquel il faute ajouter le facteur entropique de 0,25V). Cette notion simple permet de comprendre pourquoi une PAC qui d\u00e9livre une tension de 0,7 Volts pr\u00e9sente un rendement \u00e9lectrique de&nbsp; 47% (0,7\/1,48) et donc en rendement thermique de 53%. <u>Une PAC \u00e0 hydrog\u00e8ne g\u00e9n\u00e8re plus de chaleur que d&rsquo;\u00e9lectricit\u00e9<\/u>! <\/li>\n<\/ul>\n<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;Les cons\u00e9quences de ces contraintes font que, pour des raisons de simple \u00e9conomie, la PAC domestique japonaise g\u00e9n\u00e8re toute l&rsquo;eau chaude de la maison, mais seulement la moiti\u00e9 de l&rsquo;\u00e9lectricit\u00e9. Un comble!<\/p>\n<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;Ajoutez \u00e0 cel\u00e0 une gestion d\u00e9licate des arr\u00eats et des d\u00e9marrages en raison de r\u00e9actions catalytiques multiples et des ph\u00e9nom\u00e8nes thermiques complexes et vous obtenez un produit tr\u00e8s difficile \u00e0 vendre, m\u00eame avec une aide massive de l&rsquo;Etat. On sait que les Japonais peuvent faire des miracles en technologie et qu&rsquo;ils am\u00e9lioreront le syst\u00e8me, mais la thermodynamique est t\u00eatue.<\/p>\n<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; C&rsquo;est un \u00e9quipement id\u00e9al pour les riokans, h\u00f4tels traditionnels japonais mal \u00e9clair\u00e9s mais disposant d&rsquo;un vaste bain collectif tr\u00e8s, tr\u00e8s chaud!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;Les Soci\u00e9t\u00e9s japonaises (Sanyo, Nippon Oil, Matsushita, Toshiba, Ebara-Ballard, etc.) ont fait un superbe travail de d\u00e9veloppement des &quot;Polymer Electrolyte Fuel Cells ou PEFC&quot; et les ont amen\u00e9es au stade industriel. Il a fallu mettre au point le syst\u00e8me de r\u00e9forming pour faire de l&rsquo;hydrog\u00e8ne \u00e0 partir de gaz, eliminer [&hellip;]<\/p>\n","protected":false},"author":341,"featured_media":6999,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-3414","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-piles-a-combustible"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Un chauffe eau hors de prix : la Pile \u00e0 combustible domestique - leblogenergie.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.thesocialmedia.com\/leblogenergie\/2007\/12\/06\/un-chauffe-eau\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Un chauffe eau hors de prix : la Pile \u00e0 combustible domestique - leblogenergie.com\" \/>\n<meta name=\"twitter:description\" content=\"&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;Les Soci\u00e9t\u00e9s japonaises (Sanyo, Nippon Oil, Matsushita, Toshiba, Ebara-Ballard, etc.) ont fait un superbe travail de d\u00e9veloppement des &quot;Polymer Electrolyte Fuel Cells ou PEFC&quot; et les ont amen\u00e9es au stade industriel. 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